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4143 lines
145 KiB
C
Executable File
4143 lines
145 KiB
C
Executable File
/*
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* copyright (c) 2001 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_AVCODEC_H
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#define AVCODEC_AVCODEC_H
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/**
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* @file
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* @ingroup libavc
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* Libavcodec external API header
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*/
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#include <errno.h>
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#include "libavutil/samplefmt.h"
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#include "libavutil/attributes.h"
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#include "libavutil/avutil.h"
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#include "libavutil/buffer.h"
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#include "libavutil/cpu.h"
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#include "libavutil/channel_layout.h"
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#include "libavutil/dict.h"
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#include "libavutil/frame.h"
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#include "libavutil/hwcontext.h"
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#include "libavutil/log.h"
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#include "libavutil/pixfmt.h"
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#include "libavutil/rational.h"
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#include "bsf.h"
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#include "codec.h"
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#include "codec_desc.h"
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#include "codec_par.h"
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#include "codec_id.h"
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#include "packet.h"
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#include "version.h"
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/**
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* @defgroup libavc libavcodec
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* Encoding/Decoding Library
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*
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* @{
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*
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* @defgroup lavc_decoding Decoding
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* @{
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* @}
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*
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* @defgroup lavc_encoding Encoding
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* @{
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* @}
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*
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* @defgroup lavc_codec Codecs
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* @{
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* @defgroup lavc_codec_native Native Codecs
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* @{
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* @}
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* @defgroup lavc_codec_wrappers External library wrappers
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* @{
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* @}
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* @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
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* @{
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* @}
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* @}
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* @defgroup lavc_internal Internal
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* @{
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* @}
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* @}
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*/
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/**
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* @ingroup libavc
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* @defgroup lavc_encdec send/receive encoding and decoding API overview
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* @{
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*
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* The avcodec_send_packet()/avcodec_receive_frame()/avcodec_send_frame()/
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* avcodec_receive_packet() functions provide an encode/decode API, which
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* decouples input and output.
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*
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* The API is very similar for encoding/decoding and audio/video, and works as
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* follows:
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* - Set up and open the AVCodecContext as usual.
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* - Send valid input:
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* - For decoding, call avcodec_send_packet() to give the decoder raw
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* compressed data in an AVPacket.
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* - For encoding, call avcodec_send_frame() to give the encoder an AVFrame
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* containing uncompressed audio or video.
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*
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* In both cases, it is recommended that AVPackets and AVFrames are
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* refcounted, or libavcodec might have to copy the input data. (libavformat
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* always returns refcounted AVPackets, and av_frame_get_buffer() allocates
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* refcounted AVFrames.)
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* - Receive output in a loop. Periodically call one of the avcodec_receive_*()
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* functions and process their output:
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* - For decoding, call avcodec_receive_frame(). On success, it will return
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* an AVFrame containing uncompressed audio or video data.
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* - For encoding, call avcodec_receive_packet(). On success, it will return
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* an AVPacket with a compressed frame.
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*
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* Repeat this call until it returns AVERROR(EAGAIN) or an error. The
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* AVERROR(EAGAIN) return value means that new input data is required to
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* return new output. In this case, continue with sending input. For each
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* input frame/packet, the codec will typically return 1 output frame/packet,
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* but it can also be 0 or more than 1.
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*
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* At the beginning of decoding or encoding, the codec might accept multiple
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* input frames/packets without returning a frame, until its internal buffers
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* are filled. This situation is handled transparently if you follow the steps
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* outlined above.
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*
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* In theory, sending input can result in EAGAIN - this should happen only if
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* not all output was received. You can use this to structure alternative decode
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* or encode loops other than the one suggested above. For example, you could
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* try sending new input on each iteration, and try to receive output if that
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* returns EAGAIN.
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*
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* End of stream situations. These require "flushing" (aka draining) the codec,
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* as the codec might buffer multiple frames or packets internally for
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* performance or out of necessity (consider B-frames).
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* This is handled as follows:
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* - Instead of valid input, send NULL to the avcodec_send_packet() (decoding)
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* or avcodec_send_frame() (encoding) functions. This will enter draining
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* mode.
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* - Call avcodec_receive_frame() (decoding) or avcodec_receive_packet()
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* (encoding) in a loop until AVERROR_EOF is returned. The functions will
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* not return AVERROR(EAGAIN), unless you forgot to enter draining mode.
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* - Before decoding can be resumed again, the codec has to be reset with
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* avcodec_flush_buffers().
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*
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* Using the API as outlined above is highly recommended. But it is also
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* possible to call functions outside of this rigid schema. For example, you can
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* call avcodec_send_packet() repeatedly without calling
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* avcodec_receive_frame(). In this case, avcodec_send_packet() will succeed
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* until the codec's internal buffer has been filled up (which is typically of
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* size 1 per output frame, after initial input), and then reject input with
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* AVERROR(EAGAIN). Once it starts rejecting input, you have no choice but to
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* read at least some output.
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*
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* Not all codecs will follow a rigid and predictable dataflow; the only
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* guarantee is that an AVERROR(EAGAIN) return value on a send/receive call on
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* one end implies that a receive/send call on the other end will succeed, or
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* at least will not fail with AVERROR(EAGAIN). In general, no codec will
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* permit unlimited buffering of input or output.
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*
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* This API replaces the following legacy functions:
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* - avcodec_decode_video2() and avcodec_decode_audio4():
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* Use avcodec_send_packet() to feed input to the decoder, then use
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* avcodec_receive_frame() to receive decoded frames after each packet.
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* Unlike with the old video decoding API, multiple frames might result from
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* a packet. For audio, splitting the input packet into frames by partially
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* decoding packets becomes transparent to the API user. You never need to
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* feed an AVPacket to the API twice (unless it is rejected with AVERROR(EAGAIN) - then
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* no data was read from the packet).
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* Additionally, sending a flush/draining packet is required only once.
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* - avcodec_encode_video2()/avcodec_encode_audio2():
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* Use avcodec_send_frame() to feed input to the encoder, then use
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* avcodec_receive_packet() to receive encoded packets.
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* Providing user-allocated buffers for avcodec_receive_packet() is not
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* possible.
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* - The new API does not handle subtitles yet.
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*
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* Mixing new and old function calls on the same AVCodecContext is not allowed,
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* and will result in undefined behavior.
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*
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* Some codecs might require using the new API; using the old API will return
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* an error when calling it. All codecs support the new API.
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*
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* A codec is not allowed to return AVERROR(EAGAIN) for both sending and receiving. This
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* would be an invalid state, which could put the codec user into an endless
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* loop. The API has no concept of time either: it cannot happen that trying to
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* do avcodec_send_packet() results in AVERROR(EAGAIN), but a repeated call 1 second
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* later accepts the packet (with no other receive/flush API calls involved).
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* The API is a strict state machine, and the passage of time is not supposed
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* to influence it. Some timing-dependent behavior might still be deemed
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* acceptable in certain cases. But it must never result in both send/receive
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* returning EAGAIN at the same time at any point. It must also absolutely be
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* avoided that the current state is "unstable" and can "flip-flop" between
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* the send/receive APIs allowing progress. For example, it's not allowed that
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* the codec randomly decides that it actually wants to consume a packet now
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* instead of returning a frame, after it just returned AVERROR(EAGAIN) on an
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* avcodec_send_packet() call.
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* @}
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*/
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/**
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* @defgroup lavc_core Core functions/structures.
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* @ingroup libavc
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*
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* Basic definitions, functions for querying libavcodec capabilities,
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* allocating core structures, etc.
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* @{
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*/
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/**
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* @ingroup lavc_decoding
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* Required number of additionally allocated bytes at the end of the input bitstream for decoding.
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* This is mainly needed because some optimized bitstream readers read
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* 32 or 64 bit at once and could read over the end.<br>
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* Note: If the first 23 bits of the additional bytes are not 0, then damaged
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* MPEG bitstreams could cause overread and segfault.
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*/
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#define AV_INPUT_BUFFER_PADDING_SIZE 64
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/**
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* @ingroup lavc_encoding
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* minimum encoding buffer size
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* Used to avoid some checks during header writing.
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*/
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#define AV_INPUT_BUFFER_MIN_SIZE 16384
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/**
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* @ingroup lavc_decoding
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*/
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enum AVDiscard{
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/* We leave some space between them for extensions (drop some
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* keyframes for intra-only or drop just some bidir frames). */
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AVDISCARD_NONE =-16, ///< discard nothing
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AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
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AVDISCARD_NONREF = 8, ///< discard all non reference
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AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
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AVDISCARD_NONINTRA= 24, ///< discard all non intra frames
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AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
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AVDISCARD_ALL = 48, ///< discard all
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};
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enum AVAudioServiceType {
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AV_AUDIO_SERVICE_TYPE_MAIN = 0,
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AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
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AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
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AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
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AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
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AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
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AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
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AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
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AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
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AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
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};
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/**
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* @ingroup lavc_encoding
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*/
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typedef struct RcOverride{
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int start_frame;
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int end_frame;
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int qscale; // If this is 0 then quality_factor will be used instead.
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float quality_factor;
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} RcOverride;
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/* encoding support
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These flags can be passed in AVCodecContext.flags before initialization.
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Note: Not everything is supported yet.
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*/
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/**
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* Allow decoders to produce frames with data planes that are not aligned
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* to CPU requirements (e.g. due to cropping).
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*/
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#define AV_CODEC_FLAG_UNALIGNED (1 << 0)
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/**
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* Use fixed qscale.
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*/
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#define AV_CODEC_FLAG_QSCALE (1 << 1)
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/**
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* 4 MV per MB allowed / advanced prediction for H.263.
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*/
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#define AV_CODEC_FLAG_4MV (1 << 2)
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/**
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* Output even those frames that might be corrupted.
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*/
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#define AV_CODEC_FLAG_OUTPUT_CORRUPT (1 << 3)
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/**
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* Use qpel MC.
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*/
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#define AV_CODEC_FLAG_QPEL (1 << 4)
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/**
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* Don't output frames whose parameters differ from first
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* decoded frame in stream.
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*/
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#define AV_CODEC_FLAG_DROPCHANGED (1 << 5)
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/**
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* Use internal 2pass ratecontrol in first pass mode.
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*/
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#define AV_CODEC_FLAG_PASS1 (1 << 9)
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/**
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* Use internal 2pass ratecontrol in second pass mode.
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*/
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#define AV_CODEC_FLAG_PASS2 (1 << 10)
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/**
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* loop filter.
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*/
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#define AV_CODEC_FLAG_LOOP_FILTER (1 << 11)
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/**
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* Only decode/encode grayscale.
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*/
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#define AV_CODEC_FLAG_GRAY (1 << 13)
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/**
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* error[?] variables will be set during encoding.
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*/
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#define AV_CODEC_FLAG_PSNR (1 << 15)
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/**
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* Input bitstream might be truncated at a random location
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* instead of only at frame boundaries.
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*/
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#define AV_CODEC_FLAG_TRUNCATED (1 << 16)
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/**
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* Use interlaced DCT.
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*/
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#define AV_CODEC_FLAG_INTERLACED_DCT (1 << 18)
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/**
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* Force low delay.
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*/
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#define AV_CODEC_FLAG_LOW_DELAY (1 << 19)
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/**
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* Place global headers in extradata instead of every keyframe.
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*/
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#define AV_CODEC_FLAG_GLOBAL_HEADER (1 << 22)
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/**
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* Use only bitexact stuff (except (I)DCT).
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*/
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#define AV_CODEC_FLAG_BITEXACT (1 << 23)
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/* Fx : Flag for H.263+ extra options */
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/**
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* H.263 advanced intra coding / MPEG-4 AC prediction
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*/
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#define AV_CODEC_FLAG_AC_PRED (1 << 24)
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/**
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* interlaced motion estimation
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*/
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#define AV_CODEC_FLAG_INTERLACED_ME (1 << 29)
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#define AV_CODEC_FLAG_CLOSED_GOP (1U << 31)
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/**
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* Allow non spec compliant speedup tricks.
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*/
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#define AV_CODEC_FLAG2_FAST (1 << 0)
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/**
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* Skip bitstream encoding.
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*/
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#define AV_CODEC_FLAG2_NO_OUTPUT (1 << 2)
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/**
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* Place global headers at every keyframe instead of in extradata.
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*/
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#define AV_CODEC_FLAG2_LOCAL_HEADER (1 << 3)
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/**
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* timecode is in drop frame format. DEPRECATED!!!!
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*/
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#define AV_CODEC_FLAG2_DROP_FRAME_TIMECODE (1 << 13)
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/**
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* Input bitstream might be truncated at a packet boundaries
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* instead of only at frame boundaries.
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*/
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#define AV_CODEC_FLAG2_CHUNKS (1 << 15)
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/**
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* Discard cropping information from SPS.
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*/
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#define AV_CODEC_FLAG2_IGNORE_CROP (1 << 16)
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/**
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* Show all frames before the first keyframe
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*/
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#define AV_CODEC_FLAG2_SHOW_ALL (1 << 22)
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/**
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* Export motion vectors through frame side data
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*/
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#define AV_CODEC_FLAG2_EXPORT_MVS (1 << 28)
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/**
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* Do not skip samples and export skip information as frame side data
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*/
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#define AV_CODEC_FLAG2_SKIP_MANUAL (1 << 29)
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/**
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* Do not reset ASS ReadOrder field on flush (subtitles decoding)
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*/
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#define AV_CODEC_FLAG2_RO_FLUSH_NOOP (1 << 30)
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/* Unsupported options :
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* Syntax Arithmetic coding (SAC)
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* Reference Picture Selection
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* Independent Segment Decoding */
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/* /Fx */
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/* codec capabilities */
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/* Exported side data.
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These flags can be passed in AVCodecContext.export_side_data before initialization.
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*/
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/**
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* Export motion vectors through frame side data
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*/
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#define AV_CODEC_EXPORT_DATA_MVS (1 << 0)
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/**
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* Export encoder Producer Reference Time through packet side data
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*/
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#define AV_CODEC_EXPORT_DATA_PRFT (1 << 1)
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/**
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* Decoding only.
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* Export the AVVideoEncParams structure through frame side data.
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*/
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#define AV_CODEC_EXPORT_DATA_VIDEO_ENC_PARAMS (1 << 2)
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/**
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* Pan Scan area.
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* This specifies the area which should be displayed.
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* Note there may be multiple such areas for one frame.
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*/
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typedef struct AVPanScan {
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/**
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* id
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* - encoding: Set by user.
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* - decoding: Set by libavcodec.
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*/
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int id;
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/**
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* width and height in 1/16 pel
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* - encoding: Set by user.
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* - decoding: Set by libavcodec.
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*/
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int width;
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int height;
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/**
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* position of the top left corner in 1/16 pel for up to 3 fields/frames
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* - encoding: Set by user.
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* - decoding: Set by libavcodec.
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*/
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int16_t position[3][2];
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} AVPanScan;
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/**
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* This structure describes the bitrate properties of an encoded bitstream. It
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* roughly corresponds to a subset the VBV parameters for MPEG-2 or HRD
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* parameters for H.264/HEVC.
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*/
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typedef struct AVCPBProperties {
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/**
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* Maximum bitrate of the stream, in bits per second.
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* Zero if unknown or unspecified.
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*/
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#if FF_API_UNSANITIZED_BITRATES
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int max_bitrate;
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#else
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int64_t max_bitrate;
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#endif
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/**
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* Minimum bitrate of the stream, in bits per second.
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* Zero if unknown or unspecified.
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*/
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#if FF_API_UNSANITIZED_BITRATES
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int min_bitrate;
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#else
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int64_t min_bitrate;
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#endif
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/**
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* Average bitrate of the stream, in bits per second.
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* Zero if unknown or unspecified.
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*/
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#if FF_API_UNSANITIZED_BITRATES
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int avg_bitrate;
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#else
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int64_t avg_bitrate;
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#endif
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/**
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* The size of the buffer to which the ratecontrol is applied, in bits.
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* Zero if unknown or unspecified.
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*/
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int buffer_size;
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/**
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* The delay between the time the packet this structure is associated with
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* is received and the time when it should be decoded, in periods of a 27MHz
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* clock.
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*
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* UINT64_MAX when unknown or unspecified.
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*/
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uint64_t vbv_delay;
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} AVCPBProperties;
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/**
|
|
* This structure supplies correlation between a packet timestamp and a wall clock
|
|
* production time. The definition follows the Producer Reference Time ('prft')
|
|
* as defined in ISO/IEC 14496-12
|
|
*/
|
|
typedef struct AVProducerReferenceTime {
|
|
/**
|
|
* A UTC timestamp, in microseconds, since Unix epoch (e.g, av_gettime()).
|
|
*/
|
|
int64_t wallclock;
|
|
int flags;
|
|
} AVProducerReferenceTime;
|
|
|
|
/**
|
|
* The decoder will keep a reference to the frame and may reuse it later.
|
|
*/
|
|
#define AV_GET_BUFFER_FLAG_REF (1 << 0)
|
|
|
|
struct AVCodecInternal;
|
|
|
|
/**
|
|
* main external API structure.
|
|
* New fields can be added to the end with minor version bumps.
|
|
* Removal, reordering and changes to existing fields require a major
|
|
* version bump.
|
|
* You can use AVOptions (av_opt* / av_set/get*()) to access these fields from user
|
|
* applications.
|
|
* The name string for AVOptions options matches the associated command line
|
|
* parameter name and can be found in libavcodec/options_table.h
|
|
* The AVOption/command line parameter names differ in some cases from the C
|
|
* structure field names for historic reasons or brevity.
|
|
* sizeof(AVCodecContext) must not be used outside libav*.
|
|
*/
|
|
typedef struct AVCodecContext {
|
|
/**
|
|
* information on struct for av_log
|
|
* - set by avcodec_alloc_context3
|
|
*/
|
|
const AVClass *av_class;
|
|
int log_level_offset;
|
|
|
|
enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
|
|
const struct AVCodec *codec;
|
|
enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
|
|
|
|
/**
|
|
* fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
|
|
* This is used to work around some encoder bugs.
|
|
* A demuxer should set this to what is stored in the field used to identify the codec.
|
|
* If there are multiple such fields in a container then the demuxer should choose the one
|
|
* which maximizes the information about the used codec.
|
|
* If the codec tag field in a container is larger than 32 bits then the demuxer should
|
|
* remap the longer ID to 32 bits with a table or other structure. Alternatively a new
|
|
* extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
|
|
* first.
|
|
* - encoding: Set by user, if not then the default based on codec_id will be used.
|
|
* - decoding: Set by user, will be converted to uppercase by libavcodec during init.
|
|
*/
|
|
unsigned int codec_tag;
|
|
|
|
void *priv_data;
|
|
|
|
/**
|
|
* Private context used for internal data.
|
|
*
|
|
* Unlike priv_data, this is not codec-specific. It is used in general
|
|
* libavcodec functions.
|
|
*/
|
|
struct AVCodecInternal *internal;
|
|
|
|
/**
|
|
* Private data of the user, can be used to carry app specific stuff.
|
|
* - encoding: Set by user.
|
|
* - decoding: Set by user.
|
|
*/
|
|
void *opaque;
|
|
|
|
/**
|
|
* the average bitrate
|
|
* - encoding: Set by user; unused for constant quantizer encoding.
|
|
* - decoding: Set by user, may be overwritten by libavcodec
|
|
* if this info is available in the stream
|
|
*/
|
|
int64_t bit_rate;
|
|
|
|
/**
|
|
* number of bits the bitstream is allowed to diverge from the reference.
|
|
* the reference can be CBR (for CBR pass1) or VBR (for pass2)
|
|
* - encoding: Set by user; unused for constant quantizer encoding.
|
|
* - decoding: unused
|
|
*/
|
|
int bit_rate_tolerance;
|
|
|
|
/**
|
|
* Global quality for codecs which cannot change it per frame.
|
|
* This should be proportional to MPEG-1/2/4 qscale.
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
int global_quality;
|
|
|
|
/**
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
int compression_level;
|
|
#define FF_COMPRESSION_DEFAULT -1
|
|
|
|
/**
|
|
* AV_CODEC_FLAG_*.
|
|
* - encoding: Set by user.
|
|
* - decoding: Set by user.
|
|
*/
|
|
int flags;
|
|
|
|
/**
|
|
* AV_CODEC_FLAG2_*
|
|
* - encoding: Set by user.
|
|
* - decoding: Set by user.
|
|
*/
|
|
int flags2;
|
|
|
|
/**
|
|
* some codecs need / can use extradata like Huffman tables.
|
|
* MJPEG: Huffman tables
|
|
* rv10: additional flags
|
|
* MPEG-4: global headers (they can be in the bitstream or here)
|
|
* The allocated memory should be AV_INPUT_BUFFER_PADDING_SIZE bytes larger
|
|
* than extradata_size to avoid problems if it is read with the bitstream reader.
|
|
* The bytewise contents of extradata must not depend on the architecture or CPU endianness.
|
|
* Must be allocated with the av_malloc() family of functions.
|
|
* - encoding: Set/allocated/freed by libavcodec.
|
|
* - decoding: Set/allocated/freed by user.
|
|
*/
|
|
uint8_t *extradata;
|
|
int extradata_size;
|
|
|
|
/**
|
|
* This is the fundamental unit of time (in seconds) in terms
|
|
* of which frame timestamps are represented. For fixed-fps content,
|
|
* timebase should be 1/framerate and timestamp increments should be
|
|
* identically 1.
|
|
* This often, but not always is the inverse of the frame rate or field rate
|
|
* for video. 1/time_base is not the average frame rate if the frame rate is not
|
|
* constant.
|
|
*
|
|
* Like containers, elementary streams also can store timestamps, 1/time_base
|
|
* is the unit in which these timestamps are specified.
|
|
* As example of such codec time base see ISO/IEC 14496-2:2001(E)
|
|
* vop_time_increment_resolution and fixed_vop_rate
|
|
* (fixed_vop_rate == 0 implies that it is different from the framerate)
|
|
*
|
|
* - encoding: MUST be set by user.
|
|
* - decoding: the use of this field for decoding is deprecated.
|
|
* Use framerate instead.
|
|
*/
|
|
AVRational time_base;
|
|
|
|
/**
|
|
* For some codecs, the time base is closer to the field rate than the frame rate.
|
|
* Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
|
|
* if no telecine is used ...
|
|
*
|
|
* Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
|
|
*/
|
|
int ticks_per_frame;
|
|
|
|
/**
|
|
* Codec delay.
|
|
*
|
|
* Encoding: Number of frames delay there will be from the encoder input to
|
|
* the decoder output. (we assume the decoder matches the spec)
|
|
* Decoding: Number of frames delay in addition to what a standard decoder
|
|
* as specified in the spec would produce.
|
|
*
|
|
* Video:
|
|
* Number of frames the decoded output will be delayed relative to the
|
|
* encoded input.
|
|
*
|
|
* Audio:
|
|
* For encoding, this field is unused (see initial_padding).
|
|
*
|
|
* For decoding, this is the number of samples the decoder needs to
|
|
* output before the decoder's output is valid. When seeking, you should
|
|
* start decoding this many samples prior to your desired seek point.
|
|
*
|
|
* - encoding: Set by libavcodec.
|
|
* - decoding: Set by libavcodec.
|
|
*/
|
|
int delay;
|
|
|
|
|
|
/* video only */
|
|
/**
|
|
* picture width / height.
|
|
*
|
|
* @note Those fields may not match the values of the last
|
|
* AVFrame output by avcodec_decode_video2 due frame
|
|
* reordering.
|
|
*
|
|
* - encoding: MUST be set by user.
|
|
* - decoding: May be set by the user before opening the decoder if known e.g.
|
|
* from the container. Some decoders will require the dimensions
|
|
* to be set by the caller. During decoding, the decoder may
|
|
* overwrite those values as required while parsing the data.
|
|
*/
|
|
int width, height;
|
|
|
|
/**
|
|
* Bitstream width / height, may be different from width/height e.g. when
|
|
* the decoded frame is cropped before being output or lowres is enabled.
|
|
*
|
|
* @note Those field may not match the value of the last
|
|
* AVFrame output by avcodec_receive_frame() due frame
|
|
* reordering.
|
|
*
|
|
* - encoding: unused
|
|
* - decoding: May be set by the user before opening the decoder if known
|
|
* e.g. from the container. During decoding, the decoder may
|
|
* overwrite those values as required while parsing the data.
|
|
*/
|
|
int coded_width, coded_height;
|
|
|
|
/**
|
|
* the number of pictures in a group of pictures, or 0 for intra_only
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
int gop_size;
|
|
|
|
/**
|
|
* Pixel format, see AV_PIX_FMT_xxx.
|
|
* May be set by the demuxer if known from headers.
|
|
* May be overridden by the decoder if it knows better.
|
|
*
|
|
* @note This field may not match the value of the last
|
|
* AVFrame output by avcodec_receive_frame() due frame
|
|
* reordering.
|
|
*
|
|
* - encoding: Set by user.
|
|
* - decoding: Set by user if known, overridden by libavcodec while
|
|
* parsing the data.
|
|
*/
|
|
enum AVPixelFormat pix_fmt;
|
|
|
|
/**
|
|
* If non NULL, 'draw_horiz_band' is called by the libavcodec
|
|
* decoder to draw a horizontal band. It improves cache usage. Not
|
|
* all codecs can do that. You must check the codec capabilities
|
|
* beforehand.
|
|
* When multithreading is used, it may be called from multiple threads
|
|
* at the same time; threads might draw different parts of the same AVFrame,
|
|
* or multiple AVFrames, and there is no guarantee that slices will be drawn
|
|
* in order.
|
|
* The function is also used by hardware acceleration APIs.
|
|
* It is called at least once during frame decoding to pass
|
|
* the data needed for hardware render.
|
|
* In that mode instead of pixel data, AVFrame points to
|
|
* a structure specific to the acceleration API. The application
|
|
* reads the structure and can change some fields to indicate progress
|
|
* or mark state.
|
|
* - encoding: unused
|
|
* - decoding: Set by user.
|
|
* @param height the height of the slice
|
|
* @param y the y position of the slice
|
|
* @param type 1->top field, 2->bottom field, 3->frame
|
|
* @param offset offset into the AVFrame.data from which the slice should be read
|
|
*/
|
|
void (*draw_horiz_band)(struct AVCodecContext *s,
|
|
const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
|
|
int y, int type, int height);
|
|
|
|
/**
|
|
* callback to negotiate the pixelFormat
|
|
* @param fmt is the list of formats which are supported by the codec,
|
|
* it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
|
|
* The first is always the native one.
|
|
* @note The callback may be called again immediately if initialization for
|
|
* the selected (hardware-accelerated) pixel format failed.
|
|
* @warning Behavior is undefined if the callback returns a value not
|
|
* in the fmt list of formats.
|
|
* @return the chosen format
|
|
* - encoding: unused
|
|
* - decoding: Set by user, if not set the native format will be chosen.
|
|
*/
|
|
enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
|
|
|
|
/**
|
|
* maximum number of B-frames between non-B-frames
|
|
* Note: The output will be delayed by max_b_frames+1 relative to the input.
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
int max_b_frames;
|
|
|
|
/**
|
|
* qscale factor between IP and B-frames
|
|
* If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
|
|
* If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
float b_quant_factor;
|
|
|
|
#if FF_API_PRIVATE_OPT
|
|
/** @deprecated use encoder private options instead */
|
|
attribute_deprecated
|
|
int b_frame_strategy;
|
|
#endif
|
|
|
|
/**
|
|
* qscale offset between IP and B-frames
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
float b_quant_offset;
|
|
|
|
/**
|
|
* Size of the frame reordering buffer in the decoder.
|
|
* For MPEG-2 it is 1 IPB or 0 low delay IP.
|
|
* - encoding: Set by libavcodec.
|
|
* - decoding: Set by libavcodec.
|
|
*/
|
|
int has_b_frames;
|
|
|
|
#if FF_API_PRIVATE_OPT
|
|
/** @deprecated use encoder private options instead */
|
|
attribute_deprecated
|
|
int mpeg_quant;
|
|
#endif
|
|
|
|
/**
|
|
* qscale factor between P- and I-frames
|
|
* If > 0 then the last P-frame quantizer will be used (q = lastp_q * factor + offset).
|
|
* If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
float i_quant_factor;
|
|
|
|
/**
|
|
* qscale offset between P and I-frames
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
float i_quant_offset;
|
|
|
|
/**
|
|
* luminance masking (0-> disabled)
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
float lumi_masking;
|
|
|
|
/**
|
|
* temporary complexity masking (0-> disabled)
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
float temporal_cplx_masking;
|
|
|
|
/**
|
|
* spatial complexity masking (0-> disabled)
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
float spatial_cplx_masking;
|
|
|
|
/**
|
|
* p block masking (0-> disabled)
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
float p_masking;
|
|
|
|
/**
|
|
* darkness masking (0-> disabled)
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
float dark_masking;
|
|
|
|
/**
|
|
* slice count
|
|
* - encoding: Set by libavcodec.
|
|
* - decoding: Set by user (or 0).
|
|
*/
|
|
int slice_count;
|
|
|
|
#if FF_API_PRIVATE_OPT
|
|
/** @deprecated use encoder private options instead */
|
|
attribute_deprecated
|
|
int prediction_method;
|
|
#define FF_PRED_LEFT 0
|
|
#define FF_PRED_PLANE 1
|
|
#define FF_PRED_MEDIAN 2
|
|
#endif
|
|
|
|
/**
|
|
* slice offsets in the frame in bytes
|
|
* - encoding: Set/allocated by libavcodec.
|
|
* - decoding: Set/allocated by user (or NULL).
|
|
*/
|
|
int *slice_offset;
|
|
|
|
/**
|
|
* sample aspect ratio (0 if unknown)
|
|
* That is the width of a pixel divided by the height of the pixel.
|
|
* Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
|
|
* - encoding: Set by user.
|
|
* - decoding: Set by libavcodec.
|
|
*/
|
|
AVRational sample_aspect_ratio;
|
|
|
|
/**
|
|
* motion estimation comparison function
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
int me_cmp;
|
|
/**
|
|
* subpixel motion estimation comparison function
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
int me_sub_cmp;
|
|
/**
|
|
* macroblock comparison function (not supported yet)
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
int mb_cmp;
|
|
/**
|
|
* interlaced DCT comparison function
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
int ildct_cmp;
|
|
#define FF_CMP_SAD 0
|
|
#define FF_CMP_SSE 1
|
|
#define FF_CMP_SATD 2
|
|
#define FF_CMP_DCT 3
|
|
#define FF_CMP_PSNR 4
|
|
#define FF_CMP_BIT 5
|
|
#define FF_CMP_RD 6
|
|
#define FF_CMP_ZERO 7
|
|
#define FF_CMP_VSAD 8
|
|
#define FF_CMP_VSSE 9
|
|
#define FF_CMP_NSSE 10
|
|
#define FF_CMP_W53 11
|
|
#define FF_CMP_W97 12
|
|
#define FF_CMP_DCTMAX 13
|
|
#define FF_CMP_DCT264 14
|
|
#define FF_CMP_MEDIAN_SAD 15
|
|
#define FF_CMP_CHROMA 256
|
|
|
|
/**
|
|
* ME diamond size & shape
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
int dia_size;
|
|
|
|
/**
|
|
* amount of previous MV predictors (2a+1 x 2a+1 square)
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
int last_predictor_count;
|
|
|
|
#if FF_API_PRIVATE_OPT
|
|
/** @deprecated use encoder private options instead */
|
|
attribute_deprecated
|
|
int pre_me;
|
|
#endif
|
|
|
|
/**
|
|
* motion estimation prepass comparison function
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
int me_pre_cmp;
|
|
|
|
/**
|
|
* ME prepass diamond size & shape
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
int pre_dia_size;
|
|
|
|
/**
|
|
* subpel ME quality
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
int me_subpel_quality;
|
|
|
|
/**
|
|
* maximum motion estimation search range in subpel units
|
|
* If 0 then no limit.
|
|
*
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
int me_range;
|
|
|
|
/**
|
|
* slice flags
|
|
* - encoding: unused
|
|
* - decoding: Set by user.
|
|
*/
|
|
int slice_flags;
|
|
#define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
|
|
#define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG-2 field pics)
|
|
#define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
|
|
|
|
/**
|
|
* macroblock decision mode
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
int mb_decision;
|
|
#define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
|
|
#define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
|
|
#define FF_MB_DECISION_RD 2 ///< rate distortion
|
|
|
|
/**
|
|
* custom intra quantization matrix
|
|
* Must be allocated with the av_malloc() family of functions, and will be freed in
|
|
* avcodec_free_context().
|
|
* - encoding: Set/allocated by user, freed by libavcodec. Can be NULL.
|
|
* - decoding: Set/allocated/freed by libavcodec.
|
|
*/
|
|
uint16_t *intra_matrix;
|
|
|
|
/**
|
|
* custom inter quantization matrix
|
|
* Must be allocated with the av_malloc() family of functions, and will be freed in
|
|
* avcodec_free_context().
|
|
* - encoding: Set/allocated by user, freed by libavcodec. Can be NULL.
|
|
* - decoding: Set/allocated/freed by libavcodec.
|
|
*/
|
|
uint16_t *inter_matrix;
|
|
|
|
#if FF_API_PRIVATE_OPT
|
|
/** @deprecated use encoder private options instead */
|
|
attribute_deprecated
|
|
int scenechange_threshold;
|
|
|
|
/** @deprecated use encoder private options instead */
|
|
attribute_deprecated
|
|
int noise_reduction;
|
|
#endif
|
|
|
|
/**
|
|
* precision of the intra DC coefficient - 8
|
|
* - encoding: Set by user.
|
|
* - decoding: Set by libavcodec
|
|
*/
|
|
int intra_dc_precision;
|
|
|
|
/**
|
|
* Number of macroblock rows at the top which are skipped.
|
|
* - encoding: unused
|
|
* - decoding: Set by user.
|
|
*/
|
|
int skip_top;
|
|
|
|
/**
|
|
* Number of macroblock rows at the bottom which are skipped.
|
|
* - encoding: unused
|
|
* - decoding: Set by user.
|
|
*/
|
|
int skip_bottom;
|
|
|
|
/**
|
|
* minimum MB Lagrange multiplier
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
int mb_lmin;
|
|
|
|
/**
|
|
* maximum MB Lagrange multiplier
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
int mb_lmax;
|
|
|
|
#if FF_API_PRIVATE_OPT
|
|
/**
|
|
* @deprecated use encoder private options instead
|
|
*/
|
|
attribute_deprecated
|
|
int me_penalty_compensation;
|
|
#endif
|
|
|
|
/**
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
int bidir_refine;
|
|
|
|
#if FF_API_PRIVATE_OPT
|
|
/** @deprecated use encoder private options instead */
|
|
attribute_deprecated
|
|
int brd_scale;
|
|
#endif
|
|
|
|
/**
|
|
* minimum GOP size
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
int keyint_min;
|
|
|
|
/**
|
|
* number of reference frames
|
|
* - encoding: Set by user.
|
|
* - decoding: Set by lavc.
|
|
*/
|
|
int refs;
|
|
|
|
#if FF_API_PRIVATE_OPT
|
|
/** @deprecated use encoder private options instead */
|
|
attribute_deprecated
|
|
int chromaoffset;
|
|
#endif
|
|
|
|
/**
|
|
* Note: Value depends upon the compare function used for fullpel ME.
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
int mv0_threshold;
|
|
|
|
#if FF_API_PRIVATE_OPT
|
|
/** @deprecated use encoder private options instead */
|
|
attribute_deprecated
|
|
int b_sensitivity;
|
|
#endif
|
|
|
|
/**
|
|
* Chromaticity coordinates of the source primaries.
|
|
* - encoding: Set by user
|
|
* - decoding: Set by libavcodec
|
|
*/
|
|
enum AVColorPrimaries color_primaries;
|
|
|
|
/**
|
|
* Color Transfer Characteristic.
|
|
* - encoding: Set by user
|
|
* - decoding: Set by libavcodec
|
|
*/
|
|
enum AVColorTransferCharacteristic color_trc;
|
|
|
|
/**
|
|
* YUV colorspace type.
|
|
* - encoding: Set by user
|
|
* - decoding: Set by libavcodec
|
|
*/
|
|
enum AVColorSpace colorspace;
|
|
|
|
/**
|
|
* MPEG vs JPEG YUV range.
|
|
* - encoding: Set by user
|
|
* - decoding: Set by libavcodec
|
|
*/
|
|
enum AVColorRange color_range;
|
|
|
|
/**
|
|
* This defines the location of chroma samples.
|
|
* - encoding: Set by user
|
|
* - decoding: Set by libavcodec
|
|
*/
|
|
enum AVChromaLocation chroma_sample_location;
|
|
|
|
/**
|
|
* Number of slices.
|
|
* Indicates number of picture subdivisions. Used for parallelized
|
|
* decoding.
|
|
* - encoding: Set by user
|
|
* - decoding: unused
|
|
*/
|
|
int slices;
|
|
|
|
/** Field order
|
|
* - encoding: set by libavcodec
|
|
* - decoding: Set by user.
|
|
*/
|
|
enum AVFieldOrder field_order;
|
|
|
|
/* audio only */
|
|
int sample_rate; ///< samples per second
|
|
int channels; ///< number of audio channels
|
|
|
|
/**
|
|
* audio sample format
|
|
* - encoding: Set by user.
|
|
* - decoding: Set by libavcodec.
|
|
*/
|
|
enum AVSampleFormat sample_fmt; ///< sample format
|
|
|
|
/* The following data should not be initialized. */
|
|
/**
|
|
* Number of samples per channel in an audio frame.
|
|
*
|
|
* - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
|
|
* except the last must contain exactly frame_size samples per channel.
|
|
* May be 0 when the codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
|
|
* frame size is not restricted.
|
|
* - decoding: may be set by some decoders to indicate constant frame size
|
|
*/
|
|
int frame_size;
|
|
|
|
/**
|
|
* Frame counter, set by libavcodec.
|
|
*
|
|
* - decoding: total number of frames returned from the decoder so far.
|
|
* - encoding: total number of frames passed to the encoder so far.
|
|
*
|
|
* @note the counter is not incremented if encoding/decoding resulted in
|
|
* an error.
|
|
*/
|
|
int frame_number;
|
|
|
|
/**
|
|
* number of bytes per packet if constant and known or 0
|
|
* Used by some WAV based audio codecs.
|
|
*/
|
|
int block_align;
|
|
|
|
/**
|
|
* Audio cutoff bandwidth (0 means "automatic")
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
int cutoff;
|
|
|
|
/**
|
|
* Audio channel layout.
|
|
* - encoding: set by user.
|
|
* - decoding: set by user, may be overwritten by libavcodec.
|
|
*/
|
|
uint64_t channel_layout;
|
|
|
|
/**
|
|
* Request decoder to use this channel layout if it can (0 for default)
|
|
* - encoding: unused
|
|
* - decoding: Set by user.
|
|
*/
|
|
uint64_t request_channel_layout;
|
|
|
|
/**
|
|
* Type of service that the audio stream conveys.
|
|
* - encoding: Set by user.
|
|
* - decoding: Set by libavcodec.
|
|
*/
|
|
enum AVAudioServiceType audio_service_type;
|
|
|
|
/**
|
|
* desired sample format
|
|
* - encoding: Not used.
|
|
* - decoding: Set by user.
|
|
* Decoder will decode to this format if it can.
|
|
*/
|
|
enum AVSampleFormat request_sample_fmt;
|
|
|
|
/**
|
|
* This callback is called at the beginning of each frame to get data
|
|
* buffer(s) for it. There may be one contiguous buffer for all the data or
|
|
* there may be a buffer per each data plane or anything in between. What
|
|
* this means is, you may set however many entries in buf[] you feel necessary.
|
|
* Each buffer must be reference-counted using the AVBuffer API (see description
|
|
* of buf[] below).
|
|
*
|
|
* The following fields will be set in the frame before this callback is
|
|
* called:
|
|
* - format
|
|
* - width, height (video only)
|
|
* - sample_rate, channel_layout, nb_samples (audio only)
|
|
* Their values may differ from the corresponding values in
|
|
* AVCodecContext. This callback must use the frame values, not the codec
|
|
* context values, to calculate the required buffer size.
|
|
*
|
|
* This callback must fill the following fields in the frame:
|
|
* - data[]
|
|
* - linesize[]
|
|
* - extended_data:
|
|
* * if the data is planar audio with more than 8 channels, then this
|
|
* callback must allocate and fill extended_data to contain all pointers
|
|
* to all data planes. data[] must hold as many pointers as it can.
|
|
* extended_data must be allocated with av_malloc() and will be freed in
|
|
* av_frame_unref().
|
|
* * otherwise extended_data must point to data
|
|
* - buf[] must contain one or more pointers to AVBufferRef structures. Each of
|
|
* the frame's data and extended_data pointers must be contained in these. That
|
|
* is, one AVBufferRef for each allocated chunk of memory, not necessarily one
|
|
* AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
|
|
* and av_buffer_ref().
|
|
* - extended_buf and nb_extended_buf must be allocated with av_malloc() by
|
|
* this callback and filled with the extra buffers if there are more
|
|
* buffers than buf[] can hold. extended_buf will be freed in
|
|
* av_frame_unref().
|
|
*
|
|
* If AV_CODEC_CAP_DR1 is not set then get_buffer2() must call
|
|
* avcodec_default_get_buffer2() instead of providing buffers allocated by
|
|
* some other means.
|
|
*
|
|
* Each data plane must be aligned to the maximum required by the target
|
|
* CPU.
|
|
*
|
|
* @see avcodec_default_get_buffer2()
|
|
*
|
|
* Video:
|
|
*
|
|
* If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
|
|
* (read and/or written to if it is writable) later by libavcodec.
|
|
*
|
|
* avcodec_align_dimensions2() should be used to find the required width and
|
|
* height, as they normally need to be rounded up to the next multiple of 16.
|
|
*
|
|
* Some decoders do not support linesizes changing between frames.
|
|
*
|
|
* If frame multithreading is used and thread_safe_callbacks is set,
|
|
* this callback may be called from a different thread, but not from more
|
|
* than one at once. Does not need to be reentrant.
|
|
*
|
|
* @see avcodec_align_dimensions2()
|
|
*
|
|
* Audio:
|
|
*
|
|
* Decoders request a buffer of a particular size by setting
|
|
* AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
|
|
* however, utilize only part of the buffer by setting AVFrame.nb_samples
|
|
* to a smaller value in the output frame.
|
|
*
|
|
* As a convenience, av_samples_get_buffer_size() and
|
|
* av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
|
|
* functions to find the required data size and to fill data pointers and
|
|
* linesize. In AVFrame.linesize, only linesize[0] may be set for audio
|
|
* since all planes must be the same size.
|
|
*
|
|
* @see av_samples_get_buffer_size(), av_samples_fill_arrays()
|
|
*
|
|
* - encoding: unused
|
|
* - decoding: Set by libavcodec, user can override.
|
|
*/
|
|
int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
|
|
|
|
/**
|
|
* If non-zero, the decoded audio and video frames returned from
|
|
* avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
|
|
* and are valid indefinitely. The caller must free them with
|
|
* av_frame_unref() when they are not needed anymore.
|
|
* Otherwise, the decoded frames must not be freed by the caller and are
|
|
* only valid until the next decode call.
|
|
*
|
|
* This is always automatically enabled if avcodec_receive_frame() is used.
|
|
*
|
|
* - encoding: unused
|
|
* - decoding: set by the caller before avcodec_open2().
|
|
*/
|
|
attribute_deprecated
|
|
int refcounted_frames;
|
|
|
|
/* - encoding parameters */
|
|
float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
|
|
float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
|
|
|
|
/**
|
|
* minimum quantizer
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
int qmin;
|
|
|
|
/**
|
|
* maximum quantizer
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
int qmax;
|
|
|
|
/**
|
|
* maximum quantizer difference between frames
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
int max_qdiff;
|
|
|
|
/**
|
|
* decoder bitstream buffer size
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
int rc_buffer_size;
|
|
|
|
/**
|
|
* ratecontrol override, see RcOverride
|
|
* - encoding: Allocated/set/freed by user.
|
|
* - decoding: unused
|
|
*/
|
|
int rc_override_count;
|
|
RcOverride *rc_override;
|
|
|
|
/**
|
|
* maximum bitrate
|
|
* - encoding: Set by user.
|
|
* - decoding: Set by user, may be overwritten by libavcodec.
|
|
*/
|
|
int64_t rc_max_rate;
|
|
|
|
/**
|
|
* minimum bitrate
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
int64_t rc_min_rate;
|
|
|
|
/**
|
|
* Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
|
|
* - encoding: Set by user.
|
|
* - decoding: unused.
|
|
*/
|
|
float rc_max_available_vbv_use;
|
|
|
|
/**
|
|
* Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
|
|
* - encoding: Set by user.
|
|
* - decoding: unused.
|
|
*/
|
|
float rc_min_vbv_overflow_use;
|
|
|
|
/**
|
|
* Number of bits which should be loaded into the rc buffer before decoding starts.
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
int rc_initial_buffer_occupancy;
|
|
|
|
#if FF_API_CODER_TYPE
|
|
#define FF_CODER_TYPE_VLC 0
|
|
#define FF_CODER_TYPE_AC 1
|
|
#define FF_CODER_TYPE_RAW 2
|
|
#define FF_CODER_TYPE_RLE 3
|
|
/**
|
|
* @deprecated use encoder private options instead
|
|
*/
|
|
attribute_deprecated
|
|
int coder_type;
|
|
#endif /* FF_API_CODER_TYPE */
|
|
|
|
#if FF_API_PRIVATE_OPT
|
|
/** @deprecated use encoder private options instead */
|
|
attribute_deprecated
|
|
int context_model;
|
|
#endif
|
|
|
|
#if FF_API_PRIVATE_OPT
|
|
/** @deprecated use encoder private options instead */
|
|
attribute_deprecated
|
|
int frame_skip_threshold;
|
|
|
|
/** @deprecated use encoder private options instead */
|
|
attribute_deprecated
|
|
int frame_skip_factor;
|
|
|
|
/** @deprecated use encoder private options instead */
|
|
attribute_deprecated
|
|
int frame_skip_exp;
|
|
|
|
/** @deprecated use encoder private options instead */
|
|
attribute_deprecated
|
|
int frame_skip_cmp;
|
|
#endif /* FF_API_PRIVATE_OPT */
|
|
|
|
/**
|
|
* trellis RD quantization
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
int trellis;
|
|
|
|
#if FF_API_PRIVATE_OPT
|
|
/** @deprecated use encoder private options instead */
|
|
attribute_deprecated
|
|
int min_prediction_order;
|
|
|
|
/** @deprecated use encoder private options instead */
|
|
attribute_deprecated
|
|
int max_prediction_order;
|
|
|
|
/** @deprecated use encoder private options instead */
|
|
attribute_deprecated
|
|
int64_t timecode_frame_start;
|
|
#endif
|
|
|
|
#if FF_API_RTP_CALLBACK
|
|
/**
|
|
* @deprecated unused
|
|
*/
|
|
/* The RTP callback: This function is called */
|
|
/* every time the encoder has a packet to send. */
|
|
/* It depends on the encoder if the data starts */
|
|
/* with a Start Code (it should). H.263 does. */
|
|
/* mb_nb contains the number of macroblocks */
|
|
/* encoded in the RTP payload. */
|
|
attribute_deprecated
|
|
void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
|
|
#endif
|
|
|
|
#if FF_API_PRIVATE_OPT
|
|
/** @deprecated use encoder private options instead */
|
|
attribute_deprecated
|
|
int rtp_payload_size; /* The size of the RTP payload: the coder will */
|
|
/* do its best to deliver a chunk with size */
|
|
/* below rtp_payload_size, the chunk will start */
|
|
/* with a start code on some codecs like H.263. */
|
|
/* This doesn't take account of any particular */
|
|
/* headers inside the transmitted RTP payload. */
|
|
#endif
|
|
|
|
#if FF_API_STAT_BITS
|
|
/* statistics, used for 2-pass encoding */
|
|
attribute_deprecated
|
|
int mv_bits;
|
|
attribute_deprecated
|
|
int header_bits;
|
|
attribute_deprecated
|
|
int i_tex_bits;
|
|
attribute_deprecated
|
|
int p_tex_bits;
|
|
attribute_deprecated
|
|
int i_count;
|
|
attribute_deprecated
|
|
int p_count;
|
|
attribute_deprecated
|
|
int skip_count;
|
|
attribute_deprecated
|
|
int misc_bits;
|
|
|
|
/** @deprecated this field is unused */
|
|
attribute_deprecated
|
|
int frame_bits;
|
|
#endif
|
|
|
|
/**
|
|
* pass1 encoding statistics output buffer
|
|
* - encoding: Set by libavcodec.
|
|
* - decoding: unused
|
|
*/
|
|
char *stats_out;
|
|
|
|
/**
|
|
* pass2 encoding statistics input buffer
|
|
* Concatenated stuff from stats_out of pass1 should be placed here.
|
|
* - encoding: Allocated/set/freed by user.
|
|
* - decoding: unused
|
|
*/
|
|
char *stats_in;
|
|
|
|
/**
|
|
* Work around bugs in encoders which sometimes cannot be detected automatically.
|
|
* - encoding: Set by user
|
|
* - decoding: Set by user
|
|
*/
|
|
int workaround_bugs;
|
|
#define FF_BUG_AUTODETECT 1 ///< autodetection
|
|
#define FF_BUG_XVID_ILACE 4
|
|
#define FF_BUG_UMP4 8
|
|
#define FF_BUG_NO_PADDING 16
|
|
#define FF_BUG_AMV 32
|
|
#define FF_BUG_QPEL_CHROMA 64
|
|
#define FF_BUG_STD_QPEL 128
|
|
#define FF_BUG_QPEL_CHROMA2 256
|
|
#define FF_BUG_DIRECT_BLOCKSIZE 512
|
|
#define FF_BUG_EDGE 1024
|
|
#define FF_BUG_HPEL_CHROMA 2048
|
|
#define FF_BUG_DC_CLIP 4096
|
|
#define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
|
|
#define FF_BUG_TRUNCATED 16384
|
|
#define FF_BUG_IEDGE 32768
|
|
|
|
/**
|
|
* strictly follow the standard (MPEG-4, ...).
|
|
* - encoding: Set by user.
|
|
* - decoding: Set by user.
|
|
* Setting this to STRICT or higher means the encoder and decoder will
|
|
* generally do stupid things, whereas setting it to unofficial or lower
|
|
* will mean the encoder might produce output that is not supported by all
|
|
* spec-compliant decoders. Decoders don't differentiate between normal,
|
|
* unofficial and experimental (that is, they always try to decode things
|
|
* when they can) unless they are explicitly asked to behave stupidly
|
|
* (=strictly conform to the specs)
|
|
*/
|
|
int strict_std_compliance;
|
|
#define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
|
|
#define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
|
|
#define FF_COMPLIANCE_NORMAL 0
|
|
#define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
|
|
#define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
|
|
|
|
/**
|
|
* error concealment flags
|
|
* - encoding: unused
|
|
* - decoding: Set by user.
|
|
*/
|
|
int error_concealment;
|
|
#define FF_EC_GUESS_MVS 1
|
|
#define FF_EC_DEBLOCK 2
|
|
#define FF_EC_FAVOR_INTER 256
|
|
|
|
/**
|
|
* debug
|
|
* - encoding: Set by user.
|
|
* - decoding: Set by user.
|
|
*/
|
|
int debug;
|
|
#define FF_DEBUG_PICT_INFO 1
|
|
#define FF_DEBUG_RC 2
|
|
#define FF_DEBUG_BITSTREAM 4
|
|
#define FF_DEBUG_MB_TYPE 8
|
|
#define FF_DEBUG_QP 16
|
|
#if FF_API_DEBUG_MV
|
|
/**
|
|
* @deprecated this option does nothing
|
|
*/
|
|
#define FF_DEBUG_MV 32
|
|
#endif
|
|
#define FF_DEBUG_DCT_COEFF 0x00000040
|
|
#define FF_DEBUG_SKIP 0x00000080
|
|
#define FF_DEBUG_STARTCODE 0x00000100
|
|
#define FF_DEBUG_ER 0x00000400
|
|
#define FF_DEBUG_MMCO 0x00000800
|
|
#define FF_DEBUG_BUGS 0x00001000
|
|
#if FF_API_DEBUG_MV
|
|
#define FF_DEBUG_VIS_QP 0x00002000
|
|
#define FF_DEBUG_VIS_MB_TYPE 0x00004000
|
|
#endif
|
|
#define FF_DEBUG_BUFFERS 0x00008000
|
|
#define FF_DEBUG_THREADS 0x00010000
|
|
#define FF_DEBUG_GREEN_MD 0x00800000
|
|
#define FF_DEBUG_NOMC 0x01000000
|
|
|
|
#if FF_API_DEBUG_MV
|
|
/**
|
|
* debug
|
|
* - encoding: Set by user.
|
|
* - decoding: Set by user.
|
|
*/
|
|
int debug_mv;
|
|
#define FF_DEBUG_VIS_MV_P_FOR 0x00000001 // visualize forward predicted MVs of P-frames
|
|
#define FF_DEBUG_VIS_MV_B_FOR 0x00000002 // visualize forward predicted MVs of B-frames
|
|
#define FF_DEBUG_VIS_MV_B_BACK 0x00000004 // visualize backward predicted MVs of B-frames
|
|
#endif
|
|
|
|
/**
|
|
* Error recognition; may misdetect some more or less valid parts as errors.
|
|
* - encoding: unused
|
|
* - decoding: Set by user.
|
|
*/
|
|
int err_recognition;
|
|
|
|
/**
|
|
* Verify checksums embedded in the bitstream (could be of either encoded or
|
|
* decoded data, depending on the codec) and print an error message on mismatch.
|
|
* If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
|
|
* decoder returning an error.
|
|
*/
|
|
#define AV_EF_CRCCHECK (1<<0)
|
|
#define AV_EF_BITSTREAM (1<<1) ///< detect bitstream specification deviations
|
|
#define AV_EF_BUFFER (1<<2) ///< detect improper bitstream length
|
|
#define AV_EF_EXPLODE (1<<3) ///< abort decoding on minor error detection
|
|
|
|
#define AV_EF_IGNORE_ERR (1<<15) ///< ignore errors and continue
|
|
#define AV_EF_CAREFUL (1<<16) ///< consider things that violate the spec, are fast to calculate and have not been seen in the wild as errors
|
|
#define AV_EF_COMPLIANT (1<<17) ///< consider all spec non compliances as errors
|
|
#define AV_EF_AGGRESSIVE (1<<18) ///< consider things that a sane encoder should not do as an error
|
|
|
|
|
|
/**
|
|
* opaque 64-bit number (generally a PTS) that will be reordered and
|
|
* output in AVFrame.reordered_opaque
|
|
* - encoding: Set by libavcodec to the reordered_opaque of the input
|
|
* frame corresponding to the last returned packet. Only
|
|
* supported by encoders with the
|
|
* AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE capability.
|
|
* - decoding: Set by user.
|
|
*/
|
|
int64_t reordered_opaque;
|
|
|
|
/**
|
|
* Hardware accelerator in use
|
|
* - encoding: unused.
|
|
* - decoding: Set by libavcodec
|
|
*/
|
|
const struct AVHWAccel *hwaccel;
|
|
|
|
/**
|
|
* Hardware accelerator context.
|
|
* For some hardware accelerators, a global context needs to be
|
|
* provided by the user. In that case, this holds display-dependent
|
|
* data FFmpeg cannot instantiate itself. Please refer to the
|
|
* FFmpeg HW accelerator documentation to know how to fill this
|
|
* is. e.g. for VA API, this is a struct vaapi_context.
|
|
* - encoding: unused
|
|
* - decoding: Set by user
|
|
*/
|
|
void *hwaccel_context;
|
|
|
|
/**
|
|
* error
|
|
* - encoding: Set by libavcodec if flags & AV_CODEC_FLAG_PSNR.
|
|
* - decoding: unused
|
|
*/
|
|
uint64_t error[AV_NUM_DATA_POINTERS];
|
|
|
|
/**
|
|
* DCT algorithm, see FF_DCT_* below
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
int dct_algo;
|
|
#define FF_DCT_AUTO 0
|
|
#define FF_DCT_FASTINT 1
|
|
#define FF_DCT_INT 2
|
|
#define FF_DCT_MMX 3
|
|
#define FF_DCT_ALTIVEC 5
|
|
#define FF_DCT_FAAN 6
|
|
|
|
/**
|
|
* IDCT algorithm, see FF_IDCT_* below.
|
|
* - encoding: Set by user.
|
|
* - decoding: Set by user.
|
|
*/
|
|
int idct_algo;
|
|
#define FF_IDCT_AUTO 0
|
|
#define FF_IDCT_INT 1
|
|
#define FF_IDCT_SIMPLE 2
|
|
#define FF_IDCT_SIMPLEMMX 3
|
|
#define FF_IDCT_ARM 7
|
|
#define FF_IDCT_ALTIVEC 8
|
|
#define FF_IDCT_SIMPLEARM 10
|
|
#define FF_IDCT_XVID 14
|
|
#define FF_IDCT_SIMPLEARMV5TE 16
|
|
#define FF_IDCT_SIMPLEARMV6 17
|
|
#define FF_IDCT_FAAN 20
|
|
#define FF_IDCT_SIMPLENEON 22
|
|
#define FF_IDCT_NONE 24 /* Used by XvMC to extract IDCT coefficients with FF_IDCT_PERM_NONE */
|
|
#define FF_IDCT_SIMPLEAUTO 128
|
|
|
|
/**
|
|
* bits per sample/pixel from the demuxer (needed for huffyuv).
|
|
* - encoding: Set by libavcodec.
|
|
* - decoding: Set by user.
|
|
*/
|
|
int bits_per_coded_sample;
|
|
|
|
/**
|
|
* Bits per sample/pixel of internal libavcodec pixel/sample format.
|
|
* - encoding: set by user.
|
|
* - decoding: set by libavcodec.
|
|
*/
|
|
int bits_per_raw_sample;
|
|
|
|
#if FF_API_LOWRES
|
|
/**
|
|
* low resolution decoding, 1-> 1/2 size, 2->1/4 size
|
|
* - encoding: unused
|
|
* - decoding: Set by user.
|
|
*/
|
|
int lowres;
|
|
#endif
|
|
|
|
#if FF_API_CODED_FRAME
|
|
/**
|
|
* the picture in the bitstream
|
|
* - encoding: Set by libavcodec.
|
|
* - decoding: unused
|
|
*
|
|
* @deprecated use the quality factor packet side data instead
|
|
*/
|
|
attribute_deprecated AVFrame *coded_frame;
|
|
#endif
|
|
|
|
/**
|
|
* thread count
|
|
* is used to decide how many independent tasks should be passed to execute()
|
|
* - encoding: Set by user.
|
|
* - decoding: Set by user.
|
|
*/
|
|
int thread_count;
|
|
|
|
/**
|
|
* Which multithreading methods to use.
|
|
* Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
|
|
* so clients which cannot provide future frames should not use it.
|
|
*
|
|
* - encoding: Set by user, otherwise the default is used.
|
|
* - decoding: Set by user, otherwise the default is used.
|
|
*/
|
|
int thread_type;
|
|
#define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
|
|
#define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
|
|
|
|
/**
|
|
* Which multithreading methods are in use by the codec.
|
|
* - encoding: Set by libavcodec.
|
|
* - decoding: Set by libavcodec.
|
|
*/
|
|
int active_thread_type;
|
|
|
|
/**
|
|
* Set by the client if its custom get_buffer() callback can be called
|
|
* synchronously from another thread, which allows faster multithreaded decoding.
|
|
* draw_horiz_band() will be called from other threads regardless of this setting.
|
|
* Ignored if the default get_buffer() is used.
|
|
* - encoding: Set by user.
|
|
* - decoding: Set by user.
|
|
*/
|
|
int thread_safe_callbacks;
|
|
|
|
/**
|
|
* The codec may call this to execute several independent things.
|
|
* It will return only after finishing all tasks.
|
|
* The user may replace this with some multithreaded implementation,
|
|
* the default implementation will execute the parts serially.
|
|
* @param count the number of things to execute
|
|
* - encoding: Set by libavcodec, user can override.
|
|
* - decoding: Set by libavcodec, user can override.
|
|
*/
|
|
int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
|
|
|
|
/**
|
|
* The codec may call this to execute several independent things.
|
|
* It will return only after finishing all tasks.
|
|
* The user may replace this with some multithreaded implementation,
|
|
* the default implementation will execute the parts serially.
|
|
* Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
|
|
* @param c context passed also to func
|
|
* @param count the number of things to execute
|
|
* @param arg2 argument passed unchanged to func
|
|
* @param ret return values of executed functions, must have space for "count" values. May be NULL.
|
|
* @param func function that will be called count times, with jobnr from 0 to count-1.
|
|
* threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
|
|
* two instances of func executing at the same time will have the same threadnr.
|
|
* @return always 0 currently, but code should handle a future improvement where when any call to func
|
|
* returns < 0 no further calls to func may be done and < 0 is returned.
|
|
* - encoding: Set by libavcodec, user can override.
|
|
* - decoding: Set by libavcodec, user can override.
|
|
*/
|
|
int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
|
|
|
|
/**
|
|
* noise vs. sse weight for the nsse comparison function
|
|
* - encoding: Set by user.
|
|
* - decoding: unused
|
|
*/
|
|
int nsse_weight;
|
|
|
|
/**
|
|
* profile
|
|
* - encoding: Set by user.
|
|
* - decoding: Set by libavcodec.
|
|
*/
|
|
int profile;
|
|
#define FF_PROFILE_UNKNOWN -99
|
|
#define FF_PROFILE_RESERVED -100
|
|
|
|
#define FF_PROFILE_AAC_MAIN 0
|
|
#define FF_PROFILE_AAC_LOW 1
|
|
#define FF_PROFILE_AAC_SSR 2
|
|
#define FF_PROFILE_AAC_LTP 3
|
|
#define FF_PROFILE_AAC_HE 4
|
|
#define FF_PROFILE_AAC_HE_V2 28
|
|
#define FF_PROFILE_AAC_LD 22
|
|
#define FF_PROFILE_AAC_ELD 38
|
|
#define FF_PROFILE_MPEG2_AAC_LOW 128
|
|
#define FF_PROFILE_MPEG2_AAC_HE 131
|
|
|
|
#define FF_PROFILE_DNXHD 0
|
|
#define FF_PROFILE_DNXHR_LB 1
|
|
#define FF_PROFILE_DNXHR_SQ 2
|
|
#define FF_PROFILE_DNXHR_HQ 3
|
|
#define FF_PROFILE_DNXHR_HQX 4
|
|
#define FF_PROFILE_DNXHR_444 5
|
|
|
|
#define FF_PROFILE_DTS 20
|
|
#define FF_PROFILE_DTS_ES 30
|
|
#define FF_PROFILE_DTS_96_24 40
|
|
#define FF_PROFILE_DTS_HD_HRA 50
|
|
#define FF_PROFILE_DTS_HD_MA 60
|
|
#define FF_PROFILE_DTS_EXPRESS 70
|
|
|
|
#define FF_PROFILE_MPEG2_422 0
|
|
#define FF_PROFILE_MPEG2_HIGH 1
|
|
#define FF_PROFILE_MPEG2_SS 2
|
|
#define FF_PROFILE_MPEG2_SNR_SCALABLE 3
|
|
#define FF_PROFILE_MPEG2_MAIN 4
|
|
#define FF_PROFILE_MPEG2_SIMPLE 5
|
|
|
|
#define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
|
|
#define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
|
|
|
|
#define FF_PROFILE_H264_BASELINE 66
|
|
#define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
|
|
#define FF_PROFILE_H264_MAIN 77
|
|
#define FF_PROFILE_H264_EXTENDED 88
|
|
#define FF_PROFILE_H264_HIGH 100
|
|
#define FF_PROFILE_H264_HIGH_10 110
|
|
#define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
|
|
#define FF_PROFILE_H264_MULTIVIEW_HIGH 118
|
|
#define FF_PROFILE_H264_HIGH_422 122
|
|
#define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
|
|
#define FF_PROFILE_H264_STEREO_HIGH 128
|
|
#define FF_PROFILE_H264_HIGH_444 144
|
|
#define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
|
|
#define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
|
|
#define FF_PROFILE_H264_CAVLC_444 44
|
|
|
|
#define FF_PROFILE_VC1_SIMPLE 0
|
|
#define FF_PROFILE_VC1_MAIN 1
|
|
#define FF_PROFILE_VC1_COMPLEX 2
|
|
#define FF_PROFILE_VC1_ADVANCED 3
|
|
|
|
#define FF_PROFILE_MPEG4_SIMPLE 0
|
|
#define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
|
|
#define FF_PROFILE_MPEG4_CORE 2
|
|
#define FF_PROFILE_MPEG4_MAIN 3
|
|
#define FF_PROFILE_MPEG4_N_BIT 4
|
|
#define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
|
|
#define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
|
|
#define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
|
|
#define FF_PROFILE_MPEG4_HYBRID 8
|
|
#define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
|
|
#define FF_PROFILE_MPEG4_CORE_SCALABLE 10
|
|
#define FF_PROFILE_MPEG4_ADVANCED_CODING 11
|
|
#define FF_PROFILE_MPEG4_ADVANCED_CORE 12
|
|
#define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
|
|
#define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
|
|
#define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
|
|
|
|
#define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 1
|
|
#define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 2
|
|
#define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 32768
|
|
#define FF_PROFILE_JPEG2000_DCINEMA_2K 3
|
|
#define FF_PROFILE_JPEG2000_DCINEMA_4K 4
|
|
|
|
#define FF_PROFILE_VP9_0 0
|
|
#define FF_PROFILE_VP9_1 1
|
|
#define FF_PROFILE_VP9_2 2
|
|
#define FF_PROFILE_VP9_3 3
|
|
|
|
#define FF_PROFILE_HEVC_MAIN 1
|
|
#define FF_PROFILE_HEVC_MAIN_10 2
|
|
#define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
|
|
#define FF_PROFILE_HEVC_REXT 4
|
|
|
|
#define FF_PROFILE_AV1_MAIN 0
|
|
#define FF_PROFILE_AV1_HIGH 1
|
|
#define FF_PROFILE_AV1_PROFESSIONAL 2
|
|
|
|
#define FF_PROFILE_MJPEG_HUFFMAN_BASELINE_DCT 0xc0
|
|
#define FF_PROFILE_MJPEG_HUFFMAN_EXTENDED_SEQUENTIAL_DCT 0xc1
|
|
#define FF_PROFILE_MJPEG_HUFFMAN_PROGRESSIVE_DCT 0xc2
|
|
#define FF_PROFILE_MJPEG_HUFFMAN_LOSSLESS 0xc3
|
|
#define FF_PROFILE_MJPEG_JPEG_LS 0xf7
|
|
|
|
#define FF_PROFILE_SBC_MSBC 1
|
|
|
|
#define FF_PROFILE_PRORES_PROXY 0
|
|
#define FF_PROFILE_PRORES_LT 1
|
|
#define FF_PROFILE_PRORES_STANDARD 2
|
|
#define FF_PROFILE_PRORES_HQ 3
|
|
#define FF_PROFILE_PRORES_4444 4
|
|
#define FF_PROFILE_PRORES_XQ 5
|
|
|
|
#define FF_PROFILE_ARIB_PROFILE_A 0
|
|
#define FF_PROFILE_ARIB_PROFILE_C 1
|
|
|
|
#define FF_PROFILE_KLVA_SYNC 0
|
|
#define FF_PROFILE_KLVA_ASYNC 1
|
|
|
|
/**
|
|
* level
|
|
* - encoding: Set by user.
|
|
* - decoding: Set by libavcodec.
|
|
*/
|
|
int level;
|
|
#define FF_LEVEL_UNKNOWN -99
|
|
|
|
/**
|
|
* Skip loop filtering for selected frames.
|
|
* - encoding: unused
|
|
* - decoding: Set by user.
|
|
*/
|
|
enum AVDiscard skip_loop_filter;
|
|
|
|
/**
|
|
* Skip IDCT/dequantization for selected frames.
|
|
* - encoding: unused
|
|
* - decoding: Set by user.
|
|
*/
|
|
enum AVDiscard skip_idct;
|
|
|
|
/**
|
|
* Skip decoding for selected frames.
|
|
* - encoding: unused
|
|
* - decoding: Set by user.
|
|
*/
|
|
enum AVDiscard skip_frame;
|
|
|
|
/**
|
|
* Header containing style information for text subtitles.
|
|
* For SUBTITLE_ASS subtitle type, it should contain the whole ASS
|
|
* [Script Info] and [V4+ Styles] section, plus the [Events] line and
|
|
* the Format line following. It shouldn't include any Dialogue line.
|
|
* - encoding: Set/allocated/freed by user (before avcodec_open2())
|
|
* - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
|
|
*/
|
|
uint8_t *subtitle_header;
|
|
int subtitle_header_size;
|
|
|
|
#if FF_API_VBV_DELAY
|
|
/**
|
|
* VBV delay coded in the last frame (in periods of a 27 MHz clock).
|
|
* Used for compliant TS muxing.
|
|
* - encoding: Set by libavcodec.
|
|
* - decoding: unused.
|
|
* @deprecated this value is now exported as a part of
|
|
* AV_PKT_DATA_CPB_PROPERTIES packet side data
|
|
*/
|
|
attribute_deprecated
|
|
uint64_t vbv_delay;
|
|
#endif
|
|
|
|
#if FF_API_SIDEDATA_ONLY_PKT
|
|
/**
|
|
* Encoding only and set by default. Allow encoders to output packets
|
|
* that do not contain any encoded data, only side data.
|
|
*
|
|
* Some encoders need to output such packets, e.g. to update some stream
|
|
* parameters at the end of encoding.
|
|
*
|
|
* @deprecated this field disables the default behaviour and
|
|
* it is kept only for compatibility.
|
|
*/
|
|
attribute_deprecated
|
|
int side_data_only_packets;
|
|
#endif
|
|
|
|
/**
|
|
* Audio only. The number of "priming" samples (padding) inserted by the
|
|
* encoder at the beginning of the audio. I.e. this number of leading
|
|
* decoded samples must be discarded by the caller to get the original audio
|
|
* without leading padding.
|
|
*
|
|
* - decoding: unused
|
|
* - encoding: Set by libavcodec. The timestamps on the output packets are
|
|
* adjusted by the encoder so that they always refer to the
|
|
* first sample of the data actually contained in the packet,
|
|
* including any added padding. E.g. if the timebase is
|
|
* 1/samplerate and the timestamp of the first input sample is
|
|
* 0, the timestamp of the first output packet will be
|
|
* -initial_padding.
|
|
*/
|
|
int initial_padding;
|
|
|
|
/**
|
|
* - decoding: For codecs that store a framerate value in the compressed
|
|
* bitstream, the decoder may export it here. { 0, 1} when
|
|
* unknown.
|
|
* - encoding: May be used to signal the framerate of CFR content to an
|
|
* encoder.
|
|
*/
|
|
AVRational framerate;
|
|
|
|
/**
|
|
* Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
|
|
* - encoding: unused.
|
|
* - decoding: Set by libavcodec before calling get_format()
|
|
*/
|
|
enum AVPixelFormat sw_pix_fmt;
|
|
|
|
/**
|
|
* Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
|
|
* - encoding unused.
|
|
* - decoding set by user.
|
|
*/
|
|
AVRational pkt_timebase;
|
|
|
|
/**
|
|
* AVCodecDescriptor
|
|
* - encoding: unused.
|
|
* - decoding: set by libavcodec.
|
|
*/
|
|
const AVCodecDescriptor *codec_descriptor;
|
|
|
|
#if !FF_API_LOWRES
|
|
/**
|
|
* low resolution decoding, 1-> 1/2 size, 2->1/4 size
|
|
* - encoding: unused
|
|
* - decoding: Set by user.
|
|
*/
|
|
int lowres;
|
|
#endif
|
|
|
|
/**
|
|
* Current statistics for PTS correction.
|
|
* - decoding: maintained and used by libavcodec, not intended to be used by user apps
|
|
* - encoding: unused
|
|
*/
|
|
int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
|
|
int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
|
|
int64_t pts_correction_last_pts; /// PTS of the last frame
|
|
int64_t pts_correction_last_dts; /// DTS of the last frame
|
|
|
|
/**
|
|
* Character encoding of the input subtitles file.
|
|
* - decoding: set by user
|
|
* - encoding: unused
|
|
*/
|
|
char *sub_charenc;
|
|
|
|
/**
|
|
* Subtitles character encoding mode. Formats or codecs might be adjusting
|
|
* this setting (if they are doing the conversion themselves for instance).
|
|
* - decoding: set by libavcodec
|
|
* - encoding: unused
|
|
*/
|
|
int sub_charenc_mode;
|
|
#define FF_SUB_CHARENC_MODE_DO_NOTHING -1 ///< do nothing (demuxer outputs a stream supposed to be already in UTF-8, or the codec is bitmap for instance)
|
|
#define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself
|
|
#define FF_SUB_CHARENC_MODE_PRE_DECODER 1 ///< the AVPacket data needs to be recoded to UTF-8 before being fed to the decoder, requires iconv
|
|
#define FF_SUB_CHARENC_MODE_IGNORE 2 ///< neither convert the subtitles, nor check them for valid UTF-8
|
|
|
|
/**
|
|
* Skip processing alpha if supported by codec.
|
|
* Note that if the format uses pre-multiplied alpha (common with VP6,
|
|
* and recommended due to better video quality/compression)
|
|
* the image will look as if alpha-blended onto a black background.
|
|
* However for formats that do not use pre-multiplied alpha
|
|
* there might be serious artefacts (though e.g. libswscale currently
|
|
* assumes pre-multiplied alpha anyway).
|
|
*
|
|
* - decoding: set by user
|
|
* - encoding: unused
|
|
*/
|
|
int skip_alpha;
|
|
|
|
/**
|
|
* Number of samples to skip after a discontinuity
|
|
* - decoding: unused
|
|
* - encoding: set by libavcodec
|
|
*/
|
|
int seek_preroll;
|
|
|
|
#if !FF_API_DEBUG_MV
|
|
/**
|
|
* debug motion vectors
|
|
* - encoding: Set by user.
|
|
* - decoding: Set by user.
|
|
*/
|
|
int debug_mv;
|
|
#define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
|
|
#define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
|
|
#define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
|
|
#endif
|
|
|
|
/**
|
|
* custom intra quantization matrix
|
|
* - encoding: Set by user, can be NULL.
|
|
* - decoding: unused.
|
|
*/
|
|
uint16_t *chroma_intra_matrix;
|
|
|
|
/**
|
|
* dump format separator.
|
|
* can be ", " or "\n " or anything else
|
|
* - encoding: Set by user.
|
|
* - decoding: Set by user.
|
|
*/
|
|
uint8_t *dump_separator;
|
|
|
|
/**
|
|
* ',' separated list of allowed decoders.
|
|
* If NULL then all are allowed
|
|
* - encoding: unused
|
|
* - decoding: set by user
|
|
*/
|
|
char *codec_whitelist;
|
|
|
|
/**
|
|
* Properties of the stream that gets decoded
|
|
* - encoding: unused
|
|
* - decoding: set by libavcodec
|
|
*/
|
|
unsigned properties;
|
|
#define FF_CODEC_PROPERTY_LOSSLESS 0x00000001
|
|
#define FF_CODEC_PROPERTY_CLOSED_CAPTIONS 0x00000002
|
|
|
|
/**
|
|
* Additional data associated with the entire coded stream.
|
|
*
|
|
* - decoding: unused
|
|
* - encoding: may be set by libavcodec after avcodec_open2().
|
|
*/
|
|
AVPacketSideData *coded_side_data;
|
|
int nb_coded_side_data;
|
|
|
|
/**
|
|
* A reference to the AVHWFramesContext describing the input (for encoding)
|
|
* or output (decoding) frames. The reference is set by the caller and
|
|
* afterwards owned (and freed) by libavcodec - it should never be read by
|
|
* the caller after being set.
|
|
*
|
|
* - decoding: This field should be set by the caller from the get_format()
|
|
* callback. The previous reference (if any) will always be
|
|
* unreffed by libavcodec before the get_format() call.
|
|
*
|
|
* If the default get_buffer2() is used with a hwaccel pixel
|
|
* format, then this AVHWFramesContext will be used for
|
|
* allocating the frame buffers.
|
|
*
|
|
* - encoding: For hardware encoders configured to use a hwaccel pixel
|
|
* format, this field should be set by the caller to a reference
|
|
* to the AVHWFramesContext describing input frames.
|
|
* AVHWFramesContext.format must be equal to
|
|
* AVCodecContext.pix_fmt.
|
|
*
|
|
* This field should be set before avcodec_open2() is called.
|
|
*/
|
|
AVBufferRef *hw_frames_ctx;
|
|
|
|
/**
|
|
* Control the form of AVSubtitle.rects[N]->ass
|
|
* - decoding: set by user
|
|
* - encoding: unused
|
|
*/
|
|
int sub_text_format;
|
|
#define FF_SUB_TEXT_FMT_ASS 0
|
|
#if FF_API_ASS_TIMING
|
|
#define FF_SUB_TEXT_FMT_ASS_WITH_TIMINGS 1
|
|
#endif
|
|
|
|
/**
|
|
* Audio only. The amount of padding (in samples) appended by the encoder to
|
|
* the end of the audio. I.e. this number of decoded samples must be
|
|
* discarded by the caller from the end of the stream to get the original
|
|
* audio without any trailing padding.
|
|
*
|
|
* - decoding: unused
|
|
* - encoding: unused
|
|
*/
|
|
int trailing_padding;
|
|
|
|
/**
|
|
* The number of pixels per image to maximally accept.
|
|
*
|
|
* - decoding: set by user
|
|
* - encoding: set by user
|
|
*/
|
|
int64_t max_pixels;
|
|
|
|
/**
|
|
* A reference to the AVHWDeviceContext describing the device which will
|
|
* be used by a hardware encoder/decoder. The reference is set by the
|
|
* caller and afterwards owned (and freed) by libavcodec.
|
|
*
|
|
* This should be used if either the codec device does not require
|
|
* hardware frames or any that are used are to be allocated internally by
|
|
* libavcodec. If the user wishes to supply any of the frames used as
|
|
* encoder input or decoder output then hw_frames_ctx should be used
|
|
* instead. When hw_frames_ctx is set in get_format() for a decoder, this
|
|
* field will be ignored while decoding the associated stream segment, but
|
|
* may again be used on a following one after another get_format() call.
|
|
*
|
|
* For both encoders and decoders this field should be set before
|
|
* avcodec_open2() is called and must not be written to thereafter.
|
|
*
|
|
* Note that some decoders may require this field to be set initially in
|
|
* order to support hw_frames_ctx at all - in that case, all frames
|
|
* contexts used must be created on the same device.
|
|
*/
|
|
AVBufferRef *hw_device_ctx;
|
|
|
|
/**
|
|
* Bit set of AV_HWACCEL_FLAG_* flags, which affect hardware accelerated
|
|
* decoding (if active).
|
|
* - encoding: unused
|
|
* - decoding: Set by user (either before avcodec_open2(), or in the
|
|
* AVCodecContext.get_format callback)
|
|
*/
|
|
int hwaccel_flags;
|
|
|
|
/**
|
|
* Video decoding only. Certain video codecs support cropping, meaning that
|
|
* only a sub-rectangle of the decoded frame is intended for display. This
|
|
* option controls how cropping is handled by libavcodec.
|
|
*
|
|
* When set to 1 (the default), libavcodec will apply cropping internally.
|
|
* I.e. it will modify the output frame width/height fields and offset the
|
|
* data pointers (only by as much as possible while preserving alignment, or
|
|
* by the full amount if the AV_CODEC_FLAG_UNALIGNED flag is set) so that
|
|
* the frames output by the decoder refer only to the cropped area. The
|
|
* crop_* fields of the output frames will be zero.
|
|
*
|
|
* When set to 0, the width/height fields of the output frames will be set
|
|
* to the coded dimensions and the crop_* fields will describe the cropping
|
|
* rectangle. Applying the cropping is left to the caller.
|
|
*
|
|
* @warning When hardware acceleration with opaque output frames is used,
|
|
* libavcodec is unable to apply cropping from the top/left border.
|
|
*
|
|
* @note when this option is set to zero, the width/height fields of the
|
|
* AVCodecContext and output AVFrames have different meanings. The codec
|
|
* context fields store display dimensions (with the coded dimensions in
|
|
* coded_width/height), while the frame fields store the coded dimensions
|
|
* (with the display dimensions being determined by the crop_* fields).
|
|
*/
|
|
int apply_cropping;
|
|
|
|
/*
|
|
* Video decoding only. Sets the number of extra hardware frames which
|
|
* the decoder will allocate for use by the caller. This must be set
|
|
* before avcodec_open2() is called.
|
|
*
|
|
* Some hardware decoders require all frames that they will use for
|
|
* output to be defined in advance before decoding starts. For such
|
|
* decoders, the hardware frame pool must therefore be of a fixed size.
|
|
* The extra frames set here are on top of any number that the decoder
|
|
* needs internally in order to operate normally (for example, frames
|
|
* used as reference pictures).
|
|
*/
|
|
int extra_hw_frames;
|
|
|
|
/**
|
|
* The percentage of damaged samples to discard a frame.
|
|
*
|
|
* - decoding: set by user
|
|
* - encoding: unused
|
|
*/
|
|
int discard_damaged_percentage;
|
|
|
|
/**
|
|
* The number of samples per frame to maximally accept.
|
|
*
|
|
* - decoding: set by user
|
|
* - encoding: set by user
|
|
*/
|
|
int64_t max_samples;
|
|
|
|
/**
|
|
* Bit set of AV_CODEC_EXPORT_DATA_* flags, which affects the kind of
|
|
* metadata exported in frame, packet, or coded stream side data by
|
|
* decoders and encoders.
|
|
*
|
|
* - decoding: set by user
|
|
* - encoding: set by user
|
|
*/
|
|
int export_side_data;
|
|
} AVCodecContext;
|
|
|
|
#if FF_API_CODEC_GET_SET
|
|
/**
|
|
* Accessors for some AVCodecContext fields. These used to be provided for ABI
|
|
* compatibility, and do not need to be used anymore.
|
|
*/
|
|
attribute_deprecated
|
|
AVRational av_codec_get_pkt_timebase (const AVCodecContext *avctx);
|
|
attribute_deprecated
|
|
void av_codec_set_pkt_timebase (AVCodecContext *avctx, AVRational val);
|
|
|
|
attribute_deprecated
|
|
const AVCodecDescriptor *av_codec_get_codec_descriptor(const AVCodecContext *avctx);
|
|
attribute_deprecated
|
|
void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc);
|
|
|
|
attribute_deprecated
|
|
unsigned av_codec_get_codec_properties(const AVCodecContext *avctx);
|
|
|
|
#if FF_API_LOWRES
|
|
attribute_deprecated
|
|
int av_codec_get_lowres(const AVCodecContext *avctx);
|
|
attribute_deprecated
|
|
void av_codec_set_lowres(AVCodecContext *avctx, int val);
|
|
#endif
|
|
|
|
attribute_deprecated
|
|
int av_codec_get_seek_preroll(const AVCodecContext *avctx);
|
|
attribute_deprecated
|
|
void av_codec_set_seek_preroll(AVCodecContext *avctx, int val);
|
|
|
|
attribute_deprecated
|
|
uint16_t *av_codec_get_chroma_intra_matrix(const AVCodecContext *avctx);
|
|
attribute_deprecated
|
|
void av_codec_set_chroma_intra_matrix(AVCodecContext *avctx, uint16_t *val);
|
|
#endif
|
|
|
|
struct AVSubtitle;
|
|
|
|
#if FF_API_CODEC_GET_SET
|
|
attribute_deprecated
|
|
int av_codec_get_max_lowres(const AVCodec *codec);
|
|
#endif
|
|
|
|
struct MpegEncContext;
|
|
|
|
/**
|
|
* @defgroup lavc_hwaccel AVHWAccel
|
|
*
|
|
* @note Nothing in this structure should be accessed by the user. At some
|
|
* point in future it will not be externally visible at all.
|
|
*
|
|
* @{
|
|
*/
|
|
typedef struct AVHWAccel {
|
|
/**
|
|
* Name of the hardware accelerated codec.
|
|
* The name is globally unique among encoders and among decoders (but an
|
|
* encoder and a decoder can share the same name).
|
|
*/
|
|
const char *name;
|
|
|
|
/**
|
|
* Type of codec implemented by the hardware accelerator.
|
|
*
|
|
* See AVMEDIA_TYPE_xxx
|
|
*/
|
|
enum AVMediaType type;
|
|
|
|
/**
|
|
* Codec implemented by the hardware accelerator.
|
|
*
|
|
* See AV_CODEC_ID_xxx
|
|
*/
|
|
enum AVCodecID id;
|
|
|
|
/**
|
|
* Supported pixel format.
|
|
*
|
|
* Only hardware accelerated formats are supported here.
|
|
*/
|
|
enum AVPixelFormat pix_fmt;
|
|
|
|
/**
|
|
* Hardware accelerated codec capabilities.
|
|
* see AV_HWACCEL_CODEC_CAP_*
|
|
*/
|
|
int capabilities;
|
|
|
|
/*****************************************************************
|
|
* No fields below this line are part of the public API. They
|
|
* may not be used outside of libavcodec and can be changed and
|
|
* removed at will.
|
|
* New public fields should be added right above.
|
|
*****************************************************************
|
|
*/
|
|
|
|
/**
|
|
* Allocate a custom buffer
|
|
*/
|
|
int (*alloc_frame)(AVCodecContext *avctx, AVFrame *frame);
|
|
|
|
/**
|
|
* Called at the beginning of each frame or field picture.
|
|
*
|
|
* Meaningful frame information (codec specific) is guaranteed to
|
|
* be parsed at this point. This function is mandatory.
|
|
*
|
|
* Note that buf can be NULL along with buf_size set to 0.
|
|
* Otherwise, this means the whole frame is available at this point.
|
|
*
|
|
* @param avctx the codec context
|
|
* @param buf the frame data buffer base
|
|
* @param buf_size the size of the frame in bytes
|
|
* @return zero if successful, a negative value otherwise
|
|
*/
|
|
int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
|
|
|
|
/**
|
|
* Callback for parameter data (SPS/PPS/VPS etc).
|
|
*
|
|
* Useful for hardware decoders which keep persistent state about the
|
|
* video parameters, and need to receive any changes to update that state.
|
|
*
|
|
* @param avctx the codec context
|
|
* @param type the nal unit type
|
|
* @param buf the nal unit data buffer
|
|
* @param buf_size the size of the nal unit in bytes
|
|
* @return zero if successful, a negative value otherwise
|
|
*/
|
|
int (*decode_params)(AVCodecContext *avctx, int type, const uint8_t *buf, uint32_t buf_size);
|
|
|
|
/**
|
|
* Callback for each slice.
|
|
*
|
|
* Meaningful slice information (codec specific) is guaranteed to
|
|
* be parsed at this point. This function is mandatory.
|
|
* The only exception is XvMC, that works on MB level.
|
|
*
|
|
* @param avctx the codec context
|
|
* @param buf the slice data buffer base
|
|
* @param buf_size the size of the slice in bytes
|
|
* @return zero if successful, a negative value otherwise
|
|
*/
|
|
int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
|
|
|
|
/**
|
|
* Called at the end of each frame or field picture.
|
|
*
|
|
* The whole picture is parsed at this point and can now be sent
|
|
* to the hardware accelerator. This function is mandatory.
|
|
*
|
|
* @param avctx the codec context
|
|
* @return zero if successful, a negative value otherwise
|
|
*/
|
|
int (*end_frame)(AVCodecContext *avctx);
|
|
|
|
/**
|
|
* Size of per-frame hardware accelerator private data.
|
|
*
|
|
* Private data is allocated with av_mallocz() before
|
|
* AVCodecContext.get_buffer() and deallocated after
|
|
* AVCodecContext.release_buffer().
|
|
*/
|
|
int frame_priv_data_size;
|
|
|
|
/**
|
|
* Called for every Macroblock in a slice.
|
|
*
|
|
* XvMC uses it to replace the ff_mpv_reconstruct_mb().
|
|
* Instead of decoding to raw picture, MB parameters are
|
|
* stored in an array provided by the video driver.
|
|
*
|
|
* @param s the mpeg context
|
|
*/
|
|
void (*decode_mb)(struct MpegEncContext *s);
|
|
|
|
/**
|
|
* Initialize the hwaccel private data.
|
|
*
|
|
* This will be called from ff_get_format(), after hwaccel and
|
|
* hwaccel_context are set and the hwaccel private data in AVCodecInternal
|
|
* is allocated.
|
|
*/
|
|
int (*init)(AVCodecContext *avctx);
|
|
|
|
/**
|
|
* Uninitialize the hwaccel private data.
|
|
*
|
|
* This will be called from get_format() or avcodec_close(), after hwaccel
|
|
* and hwaccel_context are already uninitialized.
|
|
*/
|
|
int (*uninit)(AVCodecContext *avctx);
|
|
|
|
/**
|
|
* Size of the private data to allocate in
|
|
* AVCodecInternal.hwaccel_priv_data.
|
|
*/
|
|
int priv_data_size;
|
|
|
|
/**
|
|
* Internal hwaccel capabilities.
|
|
*/
|
|
int caps_internal;
|
|
|
|
/**
|
|
* Fill the given hw_frames context with current codec parameters. Called
|
|
* from get_format. Refer to avcodec_get_hw_frames_parameters() for
|
|
* details.
|
|
*
|
|
* This CAN be called before AVHWAccel.init is called, and you must assume
|
|
* that avctx->hwaccel_priv_data is invalid.
|
|
*/
|
|
int (*frame_params)(AVCodecContext *avctx, AVBufferRef *hw_frames_ctx);
|
|
} AVHWAccel;
|
|
|
|
/**
|
|
* HWAccel is experimental and is thus avoided in favor of non experimental
|
|
* codecs
|
|
*/
|
|
#define AV_HWACCEL_CODEC_CAP_EXPERIMENTAL 0x0200
|
|
|
|
/**
|
|
* Hardware acceleration should be used for decoding even if the codec level
|
|
* used is unknown or higher than the maximum supported level reported by the
|
|
* hardware driver.
|
|
*
|
|
* It's generally a good idea to pass this flag unless you have a specific
|
|
* reason not to, as hardware tends to under-report supported levels.
|
|
*/
|
|
#define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0)
|
|
|
|
/**
|
|
* Hardware acceleration can output YUV pixel formats with a different chroma
|
|
* sampling than 4:2:0 and/or other than 8 bits per component.
|
|
*/
|
|
#define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1)
|
|
|
|
/**
|
|
* Hardware acceleration should still be attempted for decoding when the
|
|
* codec profile does not match the reported capabilities of the hardware.
|
|
*
|
|
* For example, this can be used to try to decode baseline profile H.264
|
|
* streams in hardware - it will often succeed, because many streams marked
|
|
* as baseline profile actually conform to constrained baseline profile.
|
|
*
|
|
* @warning If the stream is actually not supported then the behaviour is
|
|
* undefined, and may include returning entirely incorrect output
|
|
* while indicating success.
|
|
*/
|
|
#define AV_HWACCEL_FLAG_ALLOW_PROFILE_MISMATCH (1 << 2)
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
#if FF_API_AVPICTURE
|
|
/**
|
|
* @defgroup lavc_picture AVPicture
|
|
*
|
|
* Functions for working with AVPicture
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* Picture data structure.
|
|
*
|
|
* Up to four components can be stored into it, the last component is
|
|
* alpha.
|
|
* @deprecated use AVFrame or imgutils functions instead
|
|
*/
|
|
typedef struct AVPicture {
|
|
attribute_deprecated
|
|
uint8_t *data[AV_NUM_DATA_POINTERS]; ///< pointers to the image data planes
|
|
attribute_deprecated
|
|
int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
|
|
} AVPicture;
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
#endif
|
|
|
|
enum AVSubtitleType {
|
|
SUBTITLE_NONE,
|
|
|
|
SUBTITLE_BITMAP, ///< A bitmap, pict will be set
|
|
|
|
/**
|
|
* Plain text, the text field must be set by the decoder and is
|
|
* authoritative. ass and pict fields may contain approximations.
|
|
*/
|
|
SUBTITLE_TEXT,
|
|
|
|
/**
|
|
* Formatted text, the ass field must be set by the decoder and is
|
|
* authoritative. pict and text fields may contain approximations.
|
|
*/
|
|
SUBTITLE_ASS,
|
|
};
|
|
|
|
#define AV_SUBTITLE_FLAG_FORCED 0x00000001
|
|
|
|
typedef struct AVSubtitleRect {
|
|
int x; ///< top left corner of pict, undefined when pict is not set
|
|
int y; ///< top left corner of pict, undefined when pict is not set
|
|
int w; ///< width of pict, undefined when pict is not set
|
|
int h; ///< height of pict, undefined when pict is not set
|
|
int nb_colors; ///< number of colors in pict, undefined when pict is not set
|
|
|
|
#if FF_API_AVPICTURE
|
|
/**
|
|
* @deprecated unused
|
|
*/
|
|
attribute_deprecated
|
|
AVPicture pict;
|
|
#endif
|
|
/**
|
|
* data+linesize for the bitmap of this subtitle.
|
|
* Can be set for text/ass as well once they are rendered.
|
|
*/
|
|
uint8_t *data[4];
|
|
int linesize[4];
|
|
|
|
enum AVSubtitleType type;
|
|
|
|
char *text; ///< 0 terminated plain UTF-8 text
|
|
|
|
/**
|
|
* 0 terminated ASS/SSA compatible event line.
|
|
* The presentation of this is unaffected by the other values in this
|
|
* struct.
|
|
*/
|
|
char *ass;
|
|
|
|
int flags;
|
|
} AVSubtitleRect;
|
|
|
|
typedef struct AVSubtitle {
|
|
uint16_t format; /* 0 = graphics */
|
|
uint32_t start_display_time; /* relative to packet pts, in ms */
|
|
uint32_t end_display_time; /* relative to packet pts, in ms */
|
|
unsigned num_rects;
|
|
AVSubtitleRect **rects;
|
|
int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
|
|
} AVSubtitle;
|
|
|
|
#if FF_API_NEXT
|
|
/**
|
|
* If c is NULL, returns the first registered codec,
|
|
* if c is non-NULL, returns the next registered codec after c,
|
|
* or NULL if c is the last one.
|
|
*/
|
|
attribute_deprecated
|
|
AVCodec *av_codec_next(const AVCodec *c);
|
|
#endif
|
|
|
|
/**
|
|
* Return the LIBAVCODEC_VERSION_INT constant.
|
|
*/
|
|
unsigned avcodec_version(void);
|
|
|
|
/**
|
|
* Return the libavcodec build-time configuration.
|
|
*/
|
|
const char *avcodec_configuration(void);
|
|
|
|
/**
|
|
* Return the libavcodec license.
|
|
*/
|
|
const char *avcodec_license(void);
|
|
|
|
#if FF_API_NEXT
|
|
/**
|
|
* Register the codec codec and initialize libavcodec.
|
|
*
|
|
* @warning either this function or avcodec_register_all() must be called
|
|
* before any other libavcodec functions.
|
|
*
|
|
* @see avcodec_register_all()
|
|
*/
|
|
attribute_deprecated
|
|
void avcodec_register(AVCodec *codec);
|
|
|
|
/**
|
|
* Register all the codecs, parsers and bitstream filters which were enabled at
|
|
* configuration time. If you do not call this function you can select exactly
|
|
* which formats you want to support, by using the individual registration
|
|
* functions.
|
|
*
|
|
* @see avcodec_register
|
|
* @see av_register_codec_parser
|
|
* @see av_register_bitstream_filter
|
|
*/
|
|
attribute_deprecated
|
|
void avcodec_register_all(void);
|
|
#endif
|
|
|
|
/**
|
|
* Allocate an AVCodecContext and set its fields to default values. The
|
|
* resulting struct should be freed with avcodec_free_context().
|
|
*
|
|
* @param codec if non-NULL, allocate private data and initialize defaults
|
|
* for the given codec. It is illegal to then call avcodec_open2()
|
|
* with a different codec.
|
|
* If NULL, then the codec-specific defaults won't be initialized,
|
|
* which may result in suboptimal default settings (this is
|
|
* important mainly for encoders, e.g. libx264).
|
|
*
|
|
* @return An AVCodecContext filled with default values or NULL on failure.
|
|
*/
|
|
AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
|
|
|
|
/**
|
|
* Free the codec context and everything associated with it and write NULL to
|
|
* the provided pointer.
|
|
*/
|
|
void avcodec_free_context(AVCodecContext **avctx);
|
|
|
|
#if FF_API_GET_CONTEXT_DEFAULTS
|
|
/**
|
|
* @deprecated This function should not be used, as closing and opening a codec
|
|
* context multiple time is not supported. A new codec context should be
|
|
* allocated for each new use.
|
|
*/
|
|
int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
|
|
#endif
|
|
|
|
/**
|
|
* Get the AVClass for AVCodecContext. It can be used in combination with
|
|
* AV_OPT_SEARCH_FAKE_OBJ for examining options.
|
|
*
|
|
* @see av_opt_find().
|
|
*/
|
|
const AVClass *avcodec_get_class(void);
|
|
|
|
#if FF_API_COPY_CONTEXT
|
|
/**
|
|
* Get the AVClass for AVFrame. It can be used in combination with
|
|
* AV_OPT_SEARCH_FAKE_OBJ for examining options.
|
|
*
|
|
* @see av_opt_find().
|
|
*/
|
|
const AVClass *avcodec_get_frame_class(void);
|
|
|
|
/**
|
|
* Get the AVClass for AVSubtitleRect. It can be used in combination with
|
|
* AV_OPT_SEARCH_FAKE_OBJ for examining options.
|
|
*
|
|
* @see av_opt_find().
|
|
*/
|
|
const AVClass *avcodec_get_subtitle_rect_class(void);
|
|
|
|
/**
|
|
* Copy the settings of the source AVCodecContext into the destination
|
|
* AVCodecContext. The resulting destination codec context will be
|
|
* unopened, i.e. you are required to call avcodec_open2() before you
|
|
* can use this AVCodecContext to decode/encode video/audio data.
|
|
*
|
|
* @param dest target codec context, should be initialized with
|
|
* avcodec_alloc_context3(NULL), but otherwise uninitialized
|
|
* @param src source codec context
|
|
* @return AVERROR() on error (e.g. memory allocation error), 0 on success
|
|
*
|
|
* @deprecated The semantics of this function are ill-defined and it should not
|
|
* be used. If you need to transfer the stream parameters from one codec context
|
|
* to another, use an intermediate AVCodecParameters instance and the
|
|
* avcodec_parameters_from_context() / avcodec_parameters_to_context()
|
|
* functions.
|
|
*/
|
|
attribute_deprecated
|
|
int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
|
|
#endif
|
|
|
|
/**
|
|
* Fill the parameters struct based on the values from the supplied codec
|
|
* context. Any allocated fields in par are freed and replaced with duplicates
|
|
* of the corresponding fields in codec.
|
|
*
|
|
* @return >= 0 on success, a negative AVERROR code on failure
|
|
*/
|
|
int avcodec_parameters_from_context(AVCodecParameters *par,
|
|
const AVCodecContext *codec);
|
|
|
|
/**
|
|
* Fill the codec context based on the values from the supplied codec
|
|
* parameters. Any allocated fields in codec that have a corresponding field in
|
|
* par are freed and replaced with duplicates of the corresponding field in par.
|
|
* Fields in codec that do not have a counterpart in par are not touched.
|
|
*
|
|
* @return >= 0 on success, a negative AVERROR code on failure.
|
|
*/
|
|
int avcodec_parameters_to_context(AVCodecContext *codec,
|
|
const AVCodecParameters *par);
|
|
|
|
/**
|
|
* Initialize the AVCodecContext to use the given AVCodec. Prior to using this
|
|
* function the context has to be allocated with avcodec_alloc_context3().
|
|
*
|
|
* The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
|
|
* avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
|
|
* retrieving a codec.
|
|
*
|
|
* @warning This function is not thread safe!
|
|
*
|
|
* @note Always call this function before using decoding routines (such as
|
|
* @ref avcodec_receive_frame()).
|
|
*
|
|
* @code
|
|
* avcodec_register_all();
|
|
* av_dict_set(&opts, "b", "2.5M", 0);
|
|
* codec = avcodec_find_decoder(AV_CODEC_ID_H264);
|
|
* if (!codec)
|
|
* exit(1);
|
|
*
|
|
* context = avcodec_alloc_context3(codec);
|
|
*
|
|
* if (avcodec_open2(context, codec, opts) < 0)
|
|
* exit(1);
|
|
* @endcode
|
|
*
|
|
* @param avctx The context to initialize.
|
|
* @param codec The codec to open this context for. If a non-NULL codec has been
|
|
* previously passed to avcodec_alloc_context3() or
|
|
* for this context, then this parameter MUST be either NULL or
|
|
* equal to the previously passed codec.
|
|
* @param options A dictionary filled with AVCodecContext and codec-private options.
|
|
* On return this object will be filled with options that were not found.
|
|
*
|
|
* @return zero on success, a negative value on error
|
|
* @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
|
|
* av_dict_set(), av_opt_find().
|
|
*/
|
|
int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
|
|
|
|
/**
|
|
* Close a given AVCodecContext and free all the data associated with it
|
|
* (but not the AVCodecContext itself).
|
|
*
|
|
* Calling this function on an AVCodecContext that hasn't been opened will free
|
|
* the codec-specific data allocated in avcodec_alloc_context3() with a non-NULL
|
|
* codec. Subsequent calls will do nothing.
|
|
*
|
|
* @note Do not use this function. Use avcodec_free_context() to destroy a
|
|
* codec context (either open or closed). Opening and closing a codec context
|
|
* multiple times is not supported anymore -- use multiple codec contexts
|
|
* instead.
|
|
*/
|
|
int avcodec_close(AVCodecContext *avctx);
|
|
|
|
/**
|
|
* Free all allocated data in the given subtitle struct.
|
|
*
|
|
* @param sub AVSubtitle to free.
|
|
*/
|
|
void avsubtitle_free(AVSubtitle *sub);
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
/**
|
|
* @addtogroup lavc_decoding
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* The default callback for AVCodecContext.get_buffer2(). It is made public so
|
|
* it can be called by custom get_buffer2() implementations for decoders without
|
|
* AV_CODEC_CAP_DR1 set.
|
|
*/
|
|
int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
|
|
|
|
/**
|
|
* Modify width and height values so that they will result in a memory
|
|
* buffer that is acceptable for the codec if you do not use any horizontal
|
|
* padding.
|
|
*
|
|
* May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
|
|
*/
|
|
void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
|
|
|
|
/**
|
|
* Modify width and height values so that they will result in a memory
|
|
* buffer that is acceptable for the codec if you also ensure that all
|
|
* line sizes are a multiple of the respective linesize_align[i].
|
|
*
|
|
* May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
|
|
*/
|
|
void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
|
|
int linesize_align[AV_NUM_DATA_POINTERS]);
|
|
|
|
/**
|
|
* Converts AVChromaLocation to swscale x/y chroma position.
|
|
*
|
|
* The positions represent the chroma (0,0) position in a coordinates system
|
|
* with luma (0,0) representing the origin and luma(1,1) representing 256,256
|
|
*
|
|
* @param xpos horizontal chroma sample position
|
|
* @param ypos vertical chroma sample position
|
|
*/
|
|
int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos);
|
|
|
|
/**
|
|
* Converts swscale x/y chroma position to AVChromaLocation.
|
|
*
|
|
* The positions represent the chroma (0,0) position in a coordinates system
|
|
* with luma (0,0) representing the origin and luma(1,1) representing 256,256
|
|
*
|
|
* @param xpos horizontal chroma sample position
|
|
* @param ypos vertical chroma sample position
|
|
*/
|
|
enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos);
|
|
|
|
/**
|
|
* Decode the audio frame of size avpkt->size from avpkt->data into frame.
|
|
*
|
|
* Some decoders may support multiple frames in a single AVPacket. Such
|
|
* decoders would then just decode the first frame and the return value would be
|
|
* less than the packet size. In this case, avcodec_decode_audio4 has to be
|
|
* called again with an AVPacket containing the remaining data in order to
|
|
* decode the second frame, etc... Even if no frames are returned, the packet
|
|
* needs to be fed to the decoder with remaining data until it is completely
|
|
* consumed or an error occurs.
|
|
*
|
|
* Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
|
|
* and output. This means that for some packets they will not immediately
|
|
* produce decoded output and need to be flushed at the end of decoding to get
|
|
* all the decoded data. Flushing is done by calling this function with packets
|
|
* with avpkt->data set to NULL and avpkt->size set to 0 until it stops
|
|
* returning samples. It is safe to flush even those decoders that are not
|
|
* marked with AV_CODEC_CAP_DELAY, then no samples will be returned.
|
|
*
|
|
* @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
|
|
* larger than the actual read bytes because some optimized bitstream
|
|
* readers read 32 or 64 bits at once and could read over the end.
|
|
*
|
|
* @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
|
|
* before packets may be fed to the decoder.
|
|
*
|
|
* @param avctx the codec context
|
|
* @param[out] frame The AVFrame in which to store decoded audio samples.
|
|
* The decoder will allocate a buffer for the decoded frame by
|
|
* calling the AVCodecContext.get_buffer2() callback.
|
|
* When AVCodecContext.refcounted_frames is set to 1, the frame is
|
|
* reference counted and the returned reference belongs to the
|
|
* caller. The caller must release the frame using av_frame_unref()
|
|
* when the frame is no longer needed. The caller may safely write
|
|
* to the frame if av_frame_is_writable() returns 1.
|
|
* When AVCodecContext.refcounted_frames is set to 0, the returned
|
|
* reference belongs to the decoder and is valid only until the
|
|
* next call to this function or until closing or flushing the
|
|
* decoder. The caller may not write to it.
|
|
* @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
|
|
* non-zero. Note that this field being set to zero
|
|
* does not mean that an error has occurred. For
|
|
* decoders with AV_CODEC_CAP_DELAY set, no given decode
|
|
* call is guaranteed to produce a frame.
|
|
* @param[in] avpkt The input AVPacket containing the input buffer.
|
|
* At least avpkt->data and avpkt->size should be set. Some
|
|
* decoders might also require additional fields to be set.
|
|
* @return A negative error code is returned if an error occurred during
|
|
* decoding, otherwise the number of bytes consumed from the input
|
|
* AVPacket is returned.
|
|
*
|
|
* @deprecated Use avcodec_send_packet() and avcodec_receive_frame().
|
|
*/
|
|
attribute_deprecated
|
|
int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
|
|
int *got_frame_ptr, const AVPacket *avpkt);
|
|
|
|
/**
|
|
* Decode the video frame of size avpkt->size from avpkt->data into picture.
|
|
* Some decoders may support multiple frames in a single AVPacket, such
|
|
* decoders would then just decode the first frame.
|
|
*
|
|
* @warning The input buffer must be AV_INPUT_BUFFER_PADDING_SIZE larger than
|
|
* the actual read bytes because some optimized bitstream readers read 32 or 64
|
|
* bits at once and could read over the end.
|
|
*
|
|
* @warning The end of the input buffer buf should be set to 0 to ensure that
|
|
* no overreading happens for damaged MPEG streams.
|
|
*
|
|
* @note Codecs which have the AV_CODEC_CAP_DELAY capability set have a delay
|
|
* between input and output, these need to be fed with avpkt->data=NULL,
|
|
* avpkt->size=0 at the end to return the remaining frames.
|
|
*
|
|
* @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
|
|
* before packets may be fed to the decoder.
|
|
*
|
|
* @param avctx the codec context
|
|
* @param[out] picture The AVFrame in which the decoded video frame will be stored.
|
|
* Use av_frame_alloc() to get an AVFrame. The codec will
|
|
* allocate memory for the actual bitmap by calling the
|
|
* AVCodecContext.get_buffer2() callback.
|
|
* When AVCodecContext.refcounted_frames is set to 1, the frame is
|
|
* reference counted and the returned reference belongs to the
|
|
* caller. The caller must release the frame using av_frame_unref()
|
|
* when the frame is no longer needed. The caller may safely write
|
|
* to the frame if av_frame_is_writable() returns 1.
|
|
* When AVCodecContext.refcounted_frames is set to 0, the returned
|
|
* reference belongs to the decoder and is valid only until the
|
|
* next call to this function or until closing or flushing the
|
|
* decoder. The caller may not write to it.
|
|
*
|
|
* @param[in] avpkt The input AVPacket containing the input buffer.
|
|
* You can create such packet with av_init_packet() and by then setting
|
|
* data and size, some decoders might in addition need other fields like
|
|
* flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
|
|
* fields possible.
|
|
* @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
|
|
* @return On error a negative value is returned, otherwise the number of bytes
|
|
* used or zero if no frame could be decompressed.
|
|
*
|
|
* @deprecated Use avcodec_send_packet() and avcodec_receive_frame().
|
|
*/
|
|
attribute_deprecated
|
|
int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
|
|
int *got_picture_ptr,
|
|
const AVPacket *avpkt);
|
|
|
|
/**
|
|
* Decode a subtitle message.
|
|
* Return a negative value on error, otherwise return the number of bytes used.
|
|
* If no subtitle could be decompressed, got_sub_ptr is zero.
|
|
* Otherwise, the subtitle is stored in *sub.
|
|
* Note that AV_CODEC_CAP_DR1 is not available for subtitle codecs. This is for
|
|
* simplicity, because the performance difference is expected to be negligible
|
|
* and reusing a get_buffer written for video codecs would probably perform badly
|
|
* due to a potentially very different allocation pattern.
|
|
*
|
|
* Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
|
|
* and output. This means that for some packets they will not immediately
|
|
* produce decoded output and need to be flushed at the end of decoding to get
|
|
* all the decoded data. Flushing is done by calling this function with packets
|
|
* with avpkt->data set to NULL and avpkt->size set to 0 until it stops
|
|
* returning subtitles. It is safe to flush even those decoders that are not
|
|
* marked with AV_CODEC_CAP_DELAY, then no subtitles will be returned.
|
|
*
|
|
* @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
|
|
* before packets may be fed to the decoder.
|
|
*
|
|
* @param avctx the codec context
|
|
* @param[out] sub The preallocated AVSubtitle in which the decoded subtitle will be stored,
|
|
* must be freed with avsubtitle_free if *got_sub_ptr is set.
|
|
* @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
|
|
* @param[in] avpkt The input AVPacket containing the input buffer.
|
|
*/
|
|
int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
|
|
int *got_sub_ptr,
|
|
AVPacket *avpkt);
|
|
|
|
/**
|
|
* Supply raw packet data as input to a decoder.
|
|
*
|
|
* Internally, this call will copy relevant AVCodecContext fields, which can
|
|
* influence decoding per-packet, and apply them when the packet is actually
|
|
* decoded. (For example AVCodecContext.skip_frame, which might direct the
|
|
* decoder to drop the frame contained by the packet sent with this function.)
|
|
*
|
|
* @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
|
|
* larger than the actual read bytes because some optimized bitstream
|
|
* readers read 32 or 64 bits at once and could read over the end.
|
|
*
|
|
* @warning Do not mix this API with the legacy API (like avcodec_decode_video2())
|
|
* on the same AVCodecContext. It will return unexpected results now
|
|
* or in future libavcodec versions.
|
|
*
|
|
* @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
|
|
* before packets may be fed to the decoder.
|
|
*
|
|
* @param avctx codec context
|
|
* @param[in] avpkt The input AVPacket. Usually, this will be a single video
|
|
* frame, or several complete audio frames.
|
|
* Ownership of the packet remains with the caller, and the
|
|
* decoder will not write to the packet. The decoder may create
|
|
* a reference to the packet data (or copy it if the packet is
|
|
* not reference-counted).
|
|
* Unlike with older APIs, the packet is always fully consumed,
|
|
* and if it contains multiple frames (e.g. some audio codecs),
|
|
* will require you to call avcodec_receive_frame() multiple
|
|
* times afterwards before you can send a new packet.
|
|
* It can be NULL (or an AVPacket with data set to NULL and
|
|
* size set to 0); in this case, it is considered a flush
|
|
* packet, which signals the end of the stream. Sending the
|
|
* first flush packet will return success. Subsequent ones are
|
|
* unnecessary and will return AVERROR_EOF. If the decoder
|
|
* still has frames buffered, it will return them after sending
|
|
* a flush packet.
|
|
*
|
|
* @return 0 on success, otherwise negative error code:
|
|
* AVERROR(EAGAIN): input is not accepted in the current state - user
|
|
* must read output with avcodec_receive_frame() (once
|
|
* all output is read, the packet should be resent, and
|
|
* the call will not fail with EAGAIN).
|
|
* AVERROR_EOF: the decoder has been flushed, and no new packets can
|
|
* be sent to it (also returned if more than 1 flush
|
|
* packet is sent)
|
|
* AVERROR(EINVAL): codec not opened, it is an encoder, or requires flush
|
|
* AVERROR(ENOMEM): failed to add packet to internal queue, or similar
|
|
* other errors: legitimate decoding errors
|
|
*/
|
|
int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt);
|
|
|
|
/**
|
|
* Return decoded output data from a decoder.
|
|
*
|
|
* @param avctx codec context
|
|
* @param frame This will be set to a reference-counted video or audio
|
|
* frame (depending on the decoder type) allocated by the
|
|
* decoder. Note that the function will always call
|
|
* av_frame_unref(frame) before doing anything else.
|
|
*
|
|
* @return
|
|
* 0: success, a frame was returned
|
|
* AVERROR(EAGAIN): output is not available in this state - user must try
|
|
* to send new input
|
|
* AVERROR_EOF: the decoder has been fully flushed, and there will be
|
|
* no more output frames
|
|
* AVERROR(EINVAL): codec not opened, or it is an encoder
|
|
* AVERROR_INPUT_CHANGED: current decoded frame has changed parameters
|
|
* with respect to first decoded frame. Applicable
|
|
* when flag AV_CODEC_FLAG_DROPCHANGED is set.
|
|
* other negative values: legitimate decoding errors
|
|
*/
|
|
int avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame);
|
|
|
|
/**
|
|
* Supply a raw video or audio frame to the encoder. Use avcodec_receive_packet()
|
|
* to retrieve buffered output packets.
|
|
*
|
|
* @param avctx codec context
|
|
* @param[in] frame AVFrame containing the raw audio or video frame to be encoded.
|
|
* Ownership of the frame remains with the caller, and the
|
|
* encoder will not write to the frame. The encoder may create
|
|
* a reference to the frame data (or copy it if the frame is
|
|
* not reference-counted).
|
|
* It can be NULL, in which case it is considered a flush
|
|
* packet. This signals the end of the stream. If the encoder
|
|
* still has packets buffered, it will return them after this
|
|
* call. Once flushing mode has been entered, additional flush
|
|
* packets are ignored, and sending frames will return
|
|
* AVERROR_EOF.
|
|
*
|
|
* For audio:
|
|
* If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
|
|
* can have any number of samples.
|
|
* If it is not set, frame->nb_samples must be equal to
|
|
* avctx->frame_size for all frames except the last.
|
|
* The final frame may be smaller than avctx->frame_size.
|
|
* @return 0 on success, otherwise negative error code:
|
|
* AVERROR(EAGAIN): input is not accepted in the current state - user
|
|
* must read output with avcodec_receive_packet() (once
|
|
* all output is read, the packet should be resent, and
|
|
* the call will not fail with EAGAIN).
|
|
* AVERROR_EOF: the encoder has been flushed, and no new frames can
|
|
* be sent to it
|
|
* AVERROR(EINVAL): codec not opened, refcounted_frames not set, it is a
|
|
* decoder, or requires flush
|
|
* AVERROR(ENOMEM): failed to add packet to internal queue, or similar
|
|
* other errors: legitimate encoding errors
|
|
*/
|
|
int avcodec_send_frame(AVCodecContext *avctx, const AVFrame *frame);
|
|
|
|
/**
|
|
* Read encoded data from the encoder.
|
|
*
|
|
* @param avctx codec context
|
|
* @param avpkt This will be set to a reference-counted packet allocated by the
|
|
* encoder. Note that the function will always call
|
|
* av_packet_unref(avpkt) before doing anything else.
|
|
* @return 0 on success, otherwise negative error code:
|
|
* AVERROR(EAGAIN): output is not available in the current state - user
|
|
* must try to send input
|
|
* AVERROR_EOF: the encoder has been fully flushed, and there will be
|
|
* no more output packets
|
|
* AVERROR(EINVAL): codec not opened, or it is a decoder
|
|
* other errors: legitimate encoding errors
|
|
*/
|
|
int avcodec_receive_packet(AVCodecContext *avctx, AVPacket *avpkt);
|
|
|
|
/**
|
|
* Create and return a AVHWFramesContext with values adequate for hardware
|
|
* decoding. This is meant to get called from the get_format callback, and is
|
|
* a helper for preparing a AVHWFramesContext for AVCodecContext.hw_frames_ctx.
|
|
* This API is for decoding with certain hardware acceleration modes/APIs only.
|
|
*
|
|
* The returned AVHWFramesContext is not initialized. The caller must do this
|
|
* with av_hwframe_ctx_init().
|
|
*
|
|
* Calling this function is not a requirement, but makes it simpler to avoid
|
|
* codec or hardware API specific details when manually allocating frames.
|
|
*
|
|
* Alternatively to this, an API user can set AVCodecContext.hw_device_ctx,
|
|
* which sets up AVCodecContext.hw_frames_ctx fully automatically, and makes
|
|
* it unnecessary to call this function or having to care about
|
|
* AVHWFramesContext initialization at all.
|
|
*
|
|
* There are a number of requirements for calling this function:
|
|
*
|
|
* - It must be called from get_format with the same avctx parameter that was
|
|
* passed to get_format. Calling it outside of get_format is not allowed, and
|
|
* can trigger undefined behavior.
|
|
* - The function is not always supported (see description of return values).
|
|
* Even if this function returns successfully, hwaccel initialization could
|
|
* fail later. (The degree to which implementations check whether the stream
|
|
* is actually supported varies. Some do this check only after the user's
|
|
* get_format callback returns.)
|
|
* - The hw_pix_fmt must be one of the choices suggested by get_format. If the
|
|
* user decides to use a AVHWFramesContext prepared with this API function,
|
|
* the user must return the same hw_pix_fmt from get_format.
|
|
* - The device_ref passed to this function must support the given hw_pix_fmt.
|
|
* - After calling this API function, it is the user's responsibility to
|
|
* initialize the AVHWFramesContext (returned by the out_frames_ref parameter),
|
|
* and to set AVCodecContext.hw_frames_ctx to it. If done, this must be done
|
|
* before returning from get_format (this is implied by the normal
|
|
* AVCodecContext.hw_frames_ctx API rules).
|
|
* - The AVHWFramesContext parameters may change every time time get_format is
|
|
* called. Also, AVCodecContext.hw_frames_ctx is reset before get_format. So
|
|
* you are inherently required to go through this process again on every
|
|
* get_format call.
|
|
* - It is perfectly possible to call this function without actually using
|
|
* the resulting AVHWFramesContext. One use-case might be trying to reuse a
|
|
* previously initialized AVHWFramesContext, and calling this API function
|
|
* only to test whether the required frame parameters have changed.
|
|
* - Fields that use dynamically allocated values of any kind must not be set
|
|
* by the user unless setting them is explicitly allowed by the documentation.
|
|
* If the user sets AVHWFramesContext.free and AVHWFramesContext.user_opaque,
|
|
* the new free callback must call the potentially set previous free callback.
|
|
* This API call may set any dynamically allocated fields, including the free
|
|
* callback.
|
|
*
|
|
* The function will set at least the following fields on AVHWFramesContext
|
|
* (potentially more, depending on hwaccel API):
|
|
*
|
|
* - All fields set by av_hwframe_ctx_alloc().
|
|
* - Set the format field to hw_pix_fmt.
|
|
* - Set the sw_format field to the most suited and most versatile format. (An
|
|
* implication is that this will prefer generic formats over opaque formats
|
|
* with arbitrary restrictions, if possible.)
|
|
* - Set the width/height fields to the coded frame size, rounded up to the
|
|
* API-specific minimum alignment.
|
|
* - Only _if_ the hwaccel requires a pre-allocated pool: set the initial_pool_size
|
|
* field to the number of maximum reference surfaces possible with the codec,
|
|
* plus 1 surface for the user to work (meaning the user can safely reference
|
|
* at most 1 decoded surface at a time), plus additional buffering introduced
|
|
* by frame threading. If the hwaccel does not require pre-allocation, the
|
|
* field is left to 0, and the decoder will allocate new surfaces on demand
|
|
* during decoding.
|
|
* - Possibly AVHWFramesContext.hwctx fields, depending on the underlying
|
|
* hardware API.
|
|
*
|
|
* Essentially, out_frames_ref returns the same as av_hwframe_ctx_alloc(), but
|
|
* with basic frame parameters set.
|
|
*
|
|
* The function is stateless, and does not change the AVCodecContext or the
|
|
* device_ref AVHWDeviceContext.
|
|
*
|
|
* @param avctx The context which is currently calling get_format, and which
|
|
* implicitly contains all state needed for filling the returned
|
|
* AVHWFramesContext properly.
|
|
* @param device_ref A reference to the AVHWDeviceContext describing the device
|
|
* which will be used by the hardware decoder.
|
|
* @param hw_pix_fmt The hwaccel format you are going to return from get_format.
|
|
* @param out_frames_ref On success, set to a reference to an _uninitialized_
|
|
* AVHWFramesContext, created from the given device_ref.
|
|
* Fields will be set to values required for decoding.
|
|
* Not changed if an error is returned.
|
|
* @return zero on success, a negative value on error. The following error codes
|
|
* have special semantics:
|
|
* AVERROR(ENOENT): the decoder does not support this functionality. Setup
|
|
* is always manual, or it is a decoder which does not
|
|
* support setting AVCodecContext.hw_frames_ctx at all,
|
|
* or it is a software format.
|
|
* AVERROR(EINVAL): it is known that hardware decoding is not supported for
|
|
* this configuration, or the device_ref is not supported
|
|
* for the hwaccel referenced by hw_pix_fmt.
|
|
*/
|
|
int avcodec_get_hw_frames_parameters(AVCodecContext *avctx,
|
|
AVBufferRef *device_ref,
|
|
enum AVPixelFormat hw_pix_fmt,
|
|
AVBufferRef **out_frames_ref);
|
|
|
|
|
|
|
|
/**
|
|
* @defgroup lavc_parsing Frame parsing
|
|
* @{
|
|
*/
|
|
|
|
enum AVPictureStructure {
|
|
AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
|
|
AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
|
|
AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
|
|
AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
|
|
};
|
|
|
|
typedef struct AVCodecParserContext {
|
|
void *priv_data;
|
|
struct AVCodecParser *parser;
|
|
int64_t frame_offset; /* offset of the current frame */
|
|
int64_t cur_offset; /* current offset
|
|
(incremented by each av_parser_parse()) */
|
|
int64_t next_frame_offset; /* offset of the next frame */
|
|
/* video info */
|
|
int pict_type; /* XXX: Put it back in AVCodecContext. */
|
|
/**
|
|
* This field is used for proper frame duration computation in lavf.
|
|
* It signals, how much longer the frame duration of the current frame
|
|
* is compared to normal frame duration.
|
|
*
|
|
* frame_duration = (1 + repeat_pict) * time_base
|
|
*
|
|
* It is used by codecs like H.264 to display telecined material.
|
|
*/
|
|
int repeat_pict; /* XXX: Put it back in AVCodecContext. */
|
|
int64_t pts; /* pts of the current frame */
|
|
int64_t dts; /* dts of the current frame */
|
|
|
|
/* private data */
|
|
int64_t last_pts;
|
|
int64_t last_dts;
|
|
int fetch_timestamp;
|
|
|
|
#define AV_PARSER_PTS_NB 4
|
|
int cur_frame_start_index;
|
|
int64_t cur_frame_offset[AV_PARSER_PTS_NB];
|
|
int64_t cur_frame_pts[AV_PARSER_PTS_NB];
|
|
int64_t cur_frame_dts[AV_PARSER_PTS_NB];
|
|
|
|
int flags;
|
|
#define PARSER_FLAG_COMPLETE_FRAMES 0x0001
|
|
#define PARSER_FLAG_ONCE 0x0002
|
|
/// Set if the parser has a valid file offset
|
|
#define PARSER_FLAG_FETCHED_OFFSET 0x0004
|
|
#define PARSER_FLAG_USE_CODEC_TS 0x1000
|
|
|
|
int64_t offset; ///< byte offset from starting packet start
|
|
int64_t cur_frame_end[AV_PARSER_PTS_NB];
|
|
|
|
/**
|
|
* Set by parser to 1 for key frames and 0 for non-key frames.
|
|
* It is initialized to -1, so if the parser doesn't set this flag,
|
|
* old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
|
|
* will be used.
|
|
*/
|
|
int key_frame;
|
|
|
|
#if FF_API_CONVERGENCE_DURATION
|
|
/**
|
|
* @deprecated unused
|
|
*/
|
|
attribute_deprecated
|
|
int64_t convergence_duration;
|
|
#endif
|
|
|
|
// Timestamp generation support:
|
|
/**
|
|
* Synchronization point for start of timestamp generation.
|
|
*
|
|
* Set to >0 for sync point, 0 for no sync point and <0 for undefined
|
|
* (default).
|
|
*
|
|
* For example, this corresponds to presence of H.264 buffering period
|
|
* SEI message.
|
|
*/
|
|
int dts_sync_point;
|
|
|
|
/**
|
|
* Offset of the current timestamp against last timestamp sync point in
|
|
* units of AVCodecContext.time_base.
|
|
*
|
|
* Set to INT_MIN when dts_sync_point unused. Otherwise, it must
|
|
* contain a valid timestamp offset.
|
|
*
|
|
* Note that the timestamp of sync point has usually a nonzero
|
|
* dts_ref_dts_delta, which refers to the previous sync point. Offset of
|
|
* the next frame after timestamp sync point will be usually 1.
|
|
*
|
|
* For example, this corresponds to H.264 cpb_removal_delay.
|
|
*/
|
|
int dts_ref_dts_delta;
|
|
|
|
/**
|
|
* Presentation delay of current frame in units of AVCodecContext.time_base.
|
|
*
|
|
* Set to INT_MIN when dts_sync_point unused. Otherwise, it must
|
|
* contain valid non-negative timestamp delta (presentation time of a frame
|
|
* must not lie in the past).
|
|
*
|
|
* This delay represents the difference between decoding and presentation
|
|
* time of the frame.
|
|
*
|
|
* For example, this corresponds to H.264 dpb_output_delay.
|
|
*/
|
|
int pts_dts_delta;
|
|
|
|
/**
|
|
* Position of the packet in file.
|
|
*
|
|
* Analogous to cur_frame_pts/dts
|
|
*/
|
|
int64_t cur_frame_pos[AV_PARSER_PTS_NB];
|
|
|
|
/**
|
|
* Byte position of currently parsed frame in stream.
|
|
*/
|
|
int64_t pos;
|
|
|
|
/**
|
|
* Previous frame byte position.
|
|
*/
|
|
int64_t last_pos;
|
|
|
|
/**
|
|
* Duration of the current frame.
|
|
* For audio, this is in units of 1 / AVCodecContext.sample_rate.
|
|
* For all other types, this is in units of AVCodecContext.time_base.
|
|
*/
|
|
int duration;
|
|
|
|
enum AVFieldOrder field_order;
|
|
|
|
/**
|
|
* Indicate whether a picture is coded as a frame, top field or bottom field.
|
|
*
|
|
* For example, H.264 field_pic_flag equal to 0 corresponds to
|
|
* AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
|
|
* equal to 1 and bottom_field_flag equal to 0 corresponds to
|
|
* AV_PICTURE_STRUCTURE_TOP_FIELD.
|
|
*/
|
|
enum AVPictureStructure picture_structure;
|
|
|
|
/**
|
|
* Picture number incremented in presentation or output order.
|
|
* This field may be reinitialized at the first picture of a new sequence.
|
|
*
|
|
* For example, this corresponds to H.264 PicOrderCnt.
|
|
*/
|
|
int output_picture_number;
|
|
|
|
/**
|
|
* Dimensions of the decoded video intended for presentation.
|
|
*/
|
|
int width;
|
|
int height;
|
|
|
|
/**
|
|
* Dimensions of the coded video.
|
|
*/
|
|
int coded_width;
|
|
int coded_height;
|
|
|
|
/**
|
|
* The format of the coded data, corresponds to enum AVPixelFormat for video
|
|
* and for enum AVSampleFormat for audio.
|
|
*
|
|
* Note that a decoder can have considerable freedom in how exactly it
|
|
* decodes the data, so the format reported here might be different from the
|
|
* one returned by a decoder.
|
|
*/
|
|
int format;
|
|
} AVCodecParserContext;
|
|
|
|
typedef struct AVCodecParser {
|
|
int codec_ids[5]; /* several codec IDs are permitted */
|
|
int priv_data_size;
|
|
int (*parser_init)(AVCodecParserContext *s);
|
|
/* This callback never returns an error, a negative value means that
|
|
* the frame start was in a previous packet. */
|
|
int (*parser_parse)(AVCodecParserContext *s,
|
|
AVCodecContext *avctx,
|
|
const uint8_t **poutbuf, int *poutbuf_size,
|
|
const uint8_t *buf, int buf_size);
|
|
void (*parser_close)(AVCodecParserContext *s);
|
|
int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
|
|
struct AVCodecParser *next;
|
|
} AVCodecParser;
|
|
|
|
/**
|
|
* Iterate over all registered codec parsers.
|
|
*
|
|
* @param opaque a pointer where libavcodec will store the iteration state. Must
|
|
* point to NULL to start the iteration.
|
|
*
|
|
* @return the next registered codec parser or NULL when the iteration is
|
|
* finished
|
|
*/
|
|
const AVCodecParser *av_parser_iterate(void **opaque);
|
|
|
|
attribute_deprecated
|
|
AVCodecParser *av_parser_next(const AVCodecParser *c);
|
|
|
|
attribute_deprecated
|
|
void av_register_codec_parser(AVCodecParser *parser);
|
|
AVCodecParserContext *av_parser_init(int codec_id);
|
|
|
|
/**
|
|
* Parse a packet.
|
|
*
|
|
* @param s parser context.
|
|
* @param avctx codec context.
|
|
* @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
|
|
* @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
|
|
* @param buf input buffer.
|
|
* @param buf_size buffer size in bytes without the padding. I.e. the full buffer
|
|
size is assumed to be buf_size + AV_INPUT_BUFFER_PADDING_SIZE.
|
|
To signal EOF, this should be 0 (so that the last frame
|
|
can be output).
|
|
* @param pts input presentation timestamp.
|
|
* @param dts input decoding timestamp.
|
|
* @param pos input byte position in stream.
|
|
* @return the number of bytes of the input bitstream used.
|
|
*
|
|
* Example:
|
|
* @code
|
|
* while(in_len){
|
|
* len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
|
|
* in_data, in_len,
|
|
* pts, dts, pos);
|
|
* in_data += len;
|
|
* in_len -= len;
|
|
*
|
|
* if(size)
|
|
* decode_frame(data, size);
|
|
* }
|
|
* @endcode
|
|
*/
|
|
int av_parser_parse2(AVCodecParserContext *s,
|
|
AVCodecContext *avctx,
|
|
uint8_t **poutbuf, int *poutbuf_size,
|
|
const uint8_t *buf, int buf_size,
|
|
int64_t pts, int64_t dts,
|
|
int64_t pos);
|
|
|
|
/**
|
|
* @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
|
|
* @deprecated use AVBitStreamFilter
|
|
*/
|
|
int av_parser_change(AVCodecParserContext *s,
|
|
AVCodecContext *avctx,
|
|
uint8_t **poutbuf, int *poutbuf_size,
|
|
const uint8_t *buf, int buf_size, int keyframe);
|
|
void av_parser_close(AVCodecParserContext *s);
|
|
|
|
/**
|
|
* @}
|
|
* @}
|
|
*/
|
|
|
|
/**
|
|
* @addtogroup lavc_encoding
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* Encode a frame of audio.
|
|
*
|
|
* Takes input samples from frame and writes the next output packet, if
|
|
* available, to avpkt. The output packet does not necessarily contain data for
|
|
* the most recent frame, as encoders can delay, split, and combine input frames
|
|
* internally as needed.
|
|
*
|
|
* @param avctx codec context
|
|
* @param avpkt output AVPacket.
|
|
* The user can supply an output buffer by setting
|
|
* avpkt->data and avpkt->size prior to calling the
|
|
* function, but if the size of the user-provided data is not
|
|
* large enough, encoding will fail. If avpkt->data and
|
|
* avpkt->size are set, avpkt->destruct must also be set. All
|
|
* other AVPacket fields will be reset by the encoder using
|
|
* av_init_packet(). If avpkt->data is NULL, the encoder will
|
|
* allocate it. The encoder will set avpkt->size to the size
|
|
* of the output packet.
|
|
*
|
|
* If this function fails or produces no output, avpkt will be
|
|
* freed using av_packet_unref().
|
|
* @param[in] frame AVFrame containing the raw audio data to be encoded.
|
|
* May be NULL when flushing an encoder that has the
|
|
* AV_CODEC_CAP_DELAY capability set.
|
|
* If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
|
|
* can have any number of samples.
|
|
* If it is not set, frame->nb_samples must be equal to
|
|
* avctx->frame_size for all frames except the last.
|
|
* The final frame may be smaller than avctx->frame_size.
|
|
* @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
|
|
* output packet is non-empty, and to 0 if it is
|
|
* empty. If the function returns an error, the
|
|
* packet can be assumed to be invalid, and the
|
|
* value of got_packet_ptr is undefined and should
|
|
* not be used.
|
|
* @return 0 on success, negative error code on failure
|
|
*
|
|
* @deprecated use avcodec_send_frame()/avcodec_receive_packet() instead
|
|
*/
|
|
attribute_deprecated
|
|
int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
|
|
const AVFrame *frame, int *got_packet_ptr);
|
|
|
|
/**
|
|
* Encode a frame of video.
|
|
*
|
|
* Takes input raw video data from frame and writes the next output packet, if
|
|
* available, to avpkt. The output packet does not necessarily contain data for
|
|
* the most recent frame, as encoders can delay and reorder input frames
|
|
* internally as needed.
|
|
*
|
|
* @param avctx codec context
|
|
* @param avpkt output AVPacket.
|
|
* The user can supply an output buffer by setting
|
|
* avpkt->data and avpkt->size prior to calling the
|
|
* function, but if the size of the user-provided data is not
|
|
* large enough, encoding will fail. All other AVPacket fields
|
|
* will be reset by the encoder using av_init_packet(). If
|
|
* avpkt->data is NULL, the encoder will allocate it.
|
|
* The encoder will set avpkt->size to the size of the
|
|
* output packet. The returned data (if any) belongs to the
|
|
* caller, he is responsible for freeing it.
|
|
*
|
|
* If this function fails or produces no output, avpkt will be
|
|
* freed using av_packet_unref().
|
|
* @param[in] frame AVFrame containing the raw video data to be encoded.
|
|
* May be NULL when flushing an encoder that has the
|
|
* AV_CODEC_CAP_DELAY capability set.
|
|
* @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
|
|
* output packet is non-empty, and to 0 if it is
|
|
* empty. If the function returns an error, the
|
|
* packet can be assumed to be invalid, and the
|
|
* value of got_packet_ptr is undefined and should
|
|
* not be used.
|
|
* @return 0 on success, negative error code on failure
|
|
*
|
|
* @deprecated use avcodec_send_frame()/avcodec_receive_packet() instead
|
|
*/
|
|
attribute_deprecated
|
|
int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
|
|
const AVFrame *frame, int *got_packet_ptr);
|
|
|
|
int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
|
|
const AVSubtitle *sub);
|
|
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
#if FF_API_AVPICTURE
|
|
/**
|
|
* @addtogroup lavc_picture
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* @deprecated unused
|
|
*/
|
|
attribute_deprecated
|
|
int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
|
|
|
|
/**
|
|
* @deprecated unused
|
|
*/
|
|
attribute_deprecated
|
|
void avpicture_free(AVPicture *picture);
|
|
|
|
/**
|
|
* @deprecated use av_image_fill_arrays() instead.
|
|
*/
|
|
attribute_deprecated
|
|
int avpicture_fill(AVPicture *picture, const uint8_t *ptr,
|
|
enum AVPixelFormat pix_fmt, int width, int height);
|
|
|
|
/**
|
|
* @deprecated use av_image_copy_to_buffer() instead.
|
|
*/
|
|
attribute_deprecated
|
|
int avpicture_layout(const AVPicture *src, enum AVPixelFormat pix_fmt,
|
|
int width, int height,
|
|
unsigned char *dest, int dest_size);
|
|
|
|
/**
|
|
* @deprecated use av_image_get_buffer_size() instead.
|
|
*/
|
|
attribute_deprecated
|
|
int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
|
|
|
|
/**
|
|
* @deprecated av_image_copy() instead.
|
|
*/
|
|
attribute_deprecated
|
|
void av_picture_copy(AVPicture *dst, const AVPicture *src,
|
|
enum AVPixelFormat pix_fmt, int width, int height);
|
|
|
|
/**
|
|
* @deprecated unused
|
|
*/
|
|
attribute_deprecated
|
|
int av_picture_crop(AVPicture *dst, const AVPicture *src,
|
|
enum AVPixelFormat pix_fmt, int top_band, int left_band);
|
|
|
|
/**
|
|
* @deprecated unused
|
|
*/
|
|
attribute_deprecated
|
|
int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
|
|
int padtop, int padbottom, int padleft, int padright, int *color);
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
#endif
|
|
|
|
/**
|
|
* @defgroup lavc_misc Utility functions
|
|
* @ingroup libavc
|
|
*
|
|
* Miscellaneous utility functions related to both encoding and decoding
|
|
* (or neither).
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* @defgroup lavc_misc_pixfmt Pixel formats
|
|
*
|
|
* Functions for working with pixel formats.
|
|
* @{
|
|
*/
|
|
|
|
#if FF_API_GETCHROMA
|
|
/**
|
|
* @deprecated Use av_pix_fmt_get_chroma_sub_sample
|
|
*/
|
|
|
|
attribute_deprecated
|
|
void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
|
|
#endif
|
|
|
|
/**
|
|
* Return a value representing the fourCC code associated to the
|
|
* pixel format pix_fmt, or 0 if no associated fourCC code can be
|
|
* found.
|
|
*/
|
|
unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
|
|
|
|
/**
|
|
* @deprecated see av_get_pix_fmt_loss()
|
|
*/
|
|
int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
|
|
int has_alpha);
|
|
|
|
/**
|
|
* Find the best pixel format to convert to given a certain source pixel
|
|
* format. When converting from one pixel format to another, information loss
|
|
* may occur. For example, when converting from RGB24 to GRAY, the color
|
|
* information will be lost. Similarly, other losses occur when converting from
|
|
* some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of
|
|
* the given pixel formats should be used to suffer the least amount of loss.
|
|
* The pixel formats from which it chooses one, are determined by the
|
|
* pix_fmt_list parameter.
|
|
*
|
|
*
|
|
* @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
|
|
* @param[in] src_pix_fmt source pixel format
|
|
* @param[in] has_alpha Whether the source pixel format alpha channel is used.
|
|
* @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
|
|
* @return The best pixel format to convert to or -1 if none was found.
|
|
*/
|
|
enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,
|
|
enum AVPixelFormat src_pix_fmt,
|
|
int has_alpha, int *loss_ptr);
|
|
|
|
/**
|
|
* @deprecated see av_find_best_pix_fmt_of_2()
|
|
*/
|
|
enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
|
|
enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
|
|
|
|
attribute_deprecated
|
|
enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
|
|
enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
|
|
|
|
enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
#if FF_API_TAG_STRING
|
|
/**
|
|
* Put a string representing the codec tag codec_tag in buf.
|
|
*
|
|
* @param buf buffer to place codec tag in
|
|
* @param buf_size size in bytes of buf
|
|
* @param codec_tag codec tag to assign
|
|
* @return the length of the string that would have been generated if
|
|
* enough space had been available, excluding the trailing null
|
|
*
|
|
* @deprecated see av_fourcc_make_string() and av_fourcc2str().
|
|
*/
|
|
attribute_deprecated
|
|
size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
|
|
#endif
|
|
|
|
void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
|
|
|
|
/**
|
|
* Return a name for the specified profile, if available.
|
|
*
|
|
* @param codec the codec that is searched for the given profile
|
|
* @param profile the profile value for which a name is requested
|
|
* @return A name for the profile if found, NULL otherwise.
|
|
*/
|
|
const char *av_get_profile_name(const AVCodec *codec, int profile);
|
|
|
|
/**
|
|
* Return a name for the specified profile, if available.
|
|
*
|
|
* @param codec_id the ID of the codec to which the requested profile belongs
|
|
* @param profile the profile value for which a name is requested
|
|
* @return A name for the profile if found, NULL otherwise.
|
|
*
|
|
* @note unlike av_get_profile_name(), which searches a list of profiles
|
|
* supported by a specific decoder or encoder implementation, this
|
|
* function searches the list of profiles from the AVCodecDescriptor
|
|
*/
|
|
const char *avcodec_profile_name(enum AVCodecID codec_id, int profile);
|
|
|
|
int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
|
|
int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
|
|
//FIXME func typedef
|
|
|
|
/**
|
|
* Fill AVFrame audio data and linesize pointers.
|
|
*
|
|
* The buffer buf must be a preallocated buffer with a size big enough
|
|
* to contain the specified samples amount. The filled AVFrame data
|
|
* pointers will point to this buffer.
|
|
*
|
|
* AVFrame extended_data channel pointers are allocated if necessary for
|
|
* planar audio.
|
|
*
|
|
* @param frame the AVFrame
|
|
* frame->nb_samples must be set prior to calling the
|
|
* function. This function fills in frame->data,
|
|
* frame->extended_data, frame->linesize[0].
|
|
* @param nb_channels channel count
|
|
* @param sample_fmt sample format
|
|
* @param buf buffer to use for frame data
|
|
* @param buf_size size of buffer
|
|
* @param align plane size sample alignment (0 = default)
|
|
* @return >=0 on success, negative error code on failure
|
|
* @todo return the size in bytes required to store the samples in
|
|
* case of success, at the next libavutil bump
|
|
*/
|
|
int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
|
|
enum AVSampleFormat sample_fmt, const uint8_t *buf,
|
|
int buf_size, int align);
|
|
|
|
/**
|
|
* Reset the internal codec state / flush internal buffers. Should be called
|
|
* e.g. when seeking or when switching to a different stream.
|
|
*
|
|
* @note for decoders, when refcounted frames are not used
|
|
* (i.e. avctx->refcounted_frames is 0), this invalidates the frames previously
|
|
* returned from the decoder. When refcounted frames are used, the decoder just
|
|
* releases any references it might keep internally, but the caller's reference
|
|
* remains valid.
|
|
*
|
|
* @note for encoders, this function will only do something if the encoder
|
|
* declares support for AV_CODEC_CAP_ENCODER_FLUSH. When called, the encoder
|
|
* will drain any remaining packets, and can then be re-used for a different
|
|
* stream (as opposed to sending a null frame which will leave the encoder
|
|
* in a permanent EOF state after draining). This can be desirable if the
|
|
* cost of tearing down and replacing the encoder instance is high.
|
|
*/
|
|
void avcodec_flush_buffers(AVCodecContext *avctx);
|
|
|
|
/**
|
|
* Return codec bits per sample.
|
|
*
|
|
* @param[in] codec_id the codec
|
|
* @return Number of bits per sample or zero if unknown for the given codec.
|
|
*/
|
|
int av_get_bits_per_sample(enum AVCodecID codec_id);
|
|
|
|
/**
|
|
* Return the PCM codec associated with a sample format.
|
|
* @param be endianness, 0 for little, 1 for big,
|
|
* -1 (or anything else) for native
|
|
* @return AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE
|
|
*/
|
|
enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
|
|
|
|
/**
|
|
* Return codec bits per sample.
|
|
* Only return non-zero if the bits per sample is exactly correct, not an
|
|
* approximation.
|
|
*
|
|
* @param[in] codec_id the codec
|
|
* @return Number of bits per sample or zero if unknown for the given codec.
|
|
*/
|
|
int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
|
|
|
|
/**
|
|
* Return audio frame duration.
|
|
*
|
|
* @param avctx codec context
|
|
* @param frame_bytes size of the frame, or 0 if unknown
|
|
* @return frame duration, in samples, if known. 0 if not able to
|
|
* determine.
|
|
*/
|
|
int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
|
|
|
|
/**
|
|
* This function is the same as av_get_audio_frame_duration(), except it works
|
|
* with AVCodecParameters instead of an AVCodecContext.
|
|
*/
|
|
int av_get_audio_frame_duration2(AVCodecParameters *par, int frame_bytes);
|
|
|
|
#if FF_API_OLD_BSF
|
|
typedef struct AVBitStreamFilterContext {
|
|
void *priv_data;
|
|
const struct AVBitStreamFilter *filter;
|
|
AVCodecParserContext *parser;
|
|
struct AVBitStreamFilterContext *next;
|
|
/**
|
|
* Internal default arguments, used if NULL is passed to av_bitstream_filter_filter().
|
|
* Not for access by library users.
|
|
*/
|
|
char *args;
|
|
} AVBitStreamFilterContext;
|
|
|
|
/**
|
|
* @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
|
|
* is deprecated. Use the new bitstream filtering API (using AVBSFContext).
|
|
*/
|
|
attribute_deprecated
|
|
void av_register_bitstream_filter(AVBitStreamFilter *bsf);
|
|
/**
|
|
* @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
|
|
* is deprecated. Use av_bsf_get_by_name(), av_bsf_alloc(), and av_bsf_init()
|
|
* from the new bitstream filtering API (using AVBSFContext).
|
|
*/
|
|
attribute_deprecated
|
|
AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
|
|
/**
|
|
* @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
|
|
* is deprecated. Use av_bsf_send_packet() and av_bsf_receive_packet() from the
|
|
* new bitstream filtering API (using AVBSFContext).
|
|
*/
|
|
attribute_deprecated
|
|
int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
|
|
AVCodecContext *avctx, const char *args,
|
|
uint8_t **poutbuf, int *poutbuf_size,
|
|
const uint8_t *buf, int buf_size, int keyframe);
|
|
/**
|
|
* @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
|
|
* is deprecated. Use av_bsf_free() from the new bitstream filtering API (using
|
|
* AVBSFContext).
|
|
*/
|
|
attribute_deprecated
|
|
void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
|
|
/**
|
|
* @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
|
|
* is deprecated. Use av_bsf_iterate() from the new bitstream filtering API (using
|
|
* AVBSFContext).
|
|
*/
|
|
attribute_deprecated
|
|
const AVBitStreamFilter *av_bitstream_filter_next(const AVBitStreamFilter *f);
|
|
#endif
|
|
|
|
#if FF_API_NEXT
|
|
attribute_deprecated
|
|
const AVBitStreamFilter *av_bsf_next(void **opaque);
|
|
#endif
|
|
|
|
/* memory */
|
|
|
|
/**
|
|
* Same behaviour av_fast_malloc but the buffer has additional
|
|
* AV_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0.
|
|
*
|
|
* In addition the whole buffer will initially and after resizes
|
|
* be 0-initialized so that no uninitialized data will ever appear.
|
|
*/
|
|
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
|
|
|
|
/**
|
|
* Same behaviour av_fast_padded_malloc except that buffer will always
|
|
* be 0-initialized after call.
|
|
*/
|
|
void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size);
|
|
|
|
/**
|
|
* Encode extradata length to a buffer. Used by xiph codecs.
|
|
*
|
|
* @param s buffer to write to; must be at least (v/255+1) bytes long
|
|
* @param v size of extradata in bytes
|
|
* @return number of bytes written to the buffer.
|
|
*/
|
|
unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
|
|
|
|
#if FF_API_USER_VISIBLE_AVHWACCEL
|
|
/**
|
|
* Register the hardware accelerator hwaccel.
|
|
*
|
|
* @deprecated This function doesn't do anything.
|
|
*/
|
|
attribute_deprecated
|
|
void av_register_hwaccel(AVHWAccel *hwaccel);
|
|
|
|
/**
|
|
* If hwaccel is NULL, returns the first registered hardware accelerator,
|
|
* if hwaccel is non-NULL, returns the next registered hardware accelerator
|
|
* after hwaccel, or NULL if hwaccel is the last one.
|
|
*
|
|
* @deprecated AVHWaccel structures contain no user-serviceable parts, so
|
|
* this function should not be used.
|
|
*/
|
|
attribute_deprecated
|
|
AVHWAccel *av_hwaccel_next(const AVHWAccel *hwaccel);
|
|
#endif
|
|
|
|
#if FF_API_LOCKMGR
|
|
/**
|
|
* Lock operation used by lockmgr
|
|
*
|
|
* @deprecated Deprecated together with av_lockmgr_register().
|
|
*/
|
|
enum AVLockOp {
|
|
AV_LOCK_CREATE, ///< Create a mutex
|
|
AV_LOCK_OBTAIN, ///< Lock the mutex
|
|
AV_LOCK_RELEASE, ///< Unlock the mutex
|
|
AV_LOCK_DESTROY, ///< Free mutex resources
|
|
};
|
|
|
|
/**
|
|
* Register a user provided lock manager supporting the operations
|
|
* specified by AVLockOp. The "mutex" argument to the function points
|
|
* to a (void *) where the lockmgr should store/get a pointer to a user
|
|
* allocated mutex. It is NULL upon AV_LOCK_CREATE and equal to the
|
|
* value left by the last call for all other ops. If the lock manager is
|
|
* unable to perform the op then it should leave the mutex in the same
|
|
* state as when it was called and return a non-zero value. However,
|
|
* when called with AV_LOCK_DESTROY the mutex will always be assumed to
|
|
* have been successfully destroyed. If av_lockmgr_register succeeds
|
|
* it will return a non-negative value, if it fails it will return a
|
|
* negative value and destroy all mutex and unregister all callbacks.
|
|
* av_lockmgr_register is not thread-safe, it must be called from a
|
|
* single thread before any calls which make use of locking are used.
|
|
*
|
|
* @param cb User defined callback. av_lockmgr_register invokes calls
|
|
* to this callback and the previously registered callback.
|
|
* The callback will be used to create more than one mutex
|
|
* each of which must be backed by its own underlying locking
|
|
* mechanism (i.e. do not use a single static object to
|
|
* implement your lock manager). If cb is set to NULL the
|
|
* lockmgr will be unregistered.
|
|
*
|
|
* @deprecated This function does nothing, and always returns 0. Be sure to
|
|
* build with thread support to get basic thread safety.
|
|
*/
|
|
attribute_deprecated
|
|
int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
|
|
#endif
|
|
|
|
/**
|
|
* @return a positive value if s is open (i.e. avcodec_open2() was called on it
|
|
* with no corresponding avcodec_close()), 0 otherwise.
|
|
*/
|
|
int avcodec_is_open(AVCodecContext *s);
|
|
|
|
/**
|
|
* Allocate a CPB properties structure and initialize its fields to default
|
|
* values.
|
|
*
|
|
* @param size if non-NULL, the size of the allocated struct will be written
|
|
* here. This is useful for embedding it in side data.
|
|
*
|
|
* @return the newly allocated struct or NULL on failure
|
|
*/
|
|
AVCPBProperties *av_cpb_properties_alloc(size_t *size);
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
#endif /* AVCODEC_AVCODEC_H */
|