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724 lines
22 KiB
C
Executable File
724 lines
22 KiB
C
Executable File
/*
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* AVPacket public API
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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_PACKET_H
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#define AVCODEC_PACKET_H
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#include <stddef.h>
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#include <stdint.h>
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#include "libavutil/attributes.h"
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#include "libavutil/buffer.h"
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#include "libavutil/dict.h"
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#include "libavutil/rational.h"
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#include "libavcodec/version.h"
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/**
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* @defgroup lavc_packet AVPacket
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*
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* Types and functions for working with AVPacket.
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* @{
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*/
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enum AVPacketSideDataType {
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/**
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* An AV_PKT_DATA_PALETTE side data packet contains exactly AVPALETTE_SIZE
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* bytes worth of palette. This side data signals that a new palette is
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* present.
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*/
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AV_PKT_DATA_PALETTE,
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/**
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* The AV_PKT_DATA_NEW_EXTRADATA is used to notify the codec or the format
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* that the extradata buffer was changed and the receiving side should
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* act upon it appropriately. The new extradata is embedded in the side
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* data buffer and should be immediately used for processing the current
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* frame or packet.
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*/
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AV_PKT_DATA_NEW_EXTRADATA,
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/**
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* An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
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* @code
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* u32le param_flags
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* if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
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* s32le channel_count
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* if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
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* u64le channel_layout
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* if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
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* s32le sample_rate
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* if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
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* s32le width
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* s32le height
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* @endcode
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*/
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AV_PKT_DATA_PARAM_CHANGE,
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/**
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* An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
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* structures with info about macroblocks relevant to splitting the
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* packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
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* That is, it does not necessarily contain info about all macroblocks,
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* as long as the distance between macroblocks in the info is smaller
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* than the target payload size.
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* Each MB info structure is 12 bytes, and is laid out as follows:
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* @code
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* u32le bit offset from the start of the packet
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* u8 current quantizer at the start of the macroblock
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* u8 GOB number
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* u16le macroblock address within the GOB
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* u8 horizontal MV predictor
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* u8 vertical MV predictor
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* u8 horizontal MV predictor for block number 3
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* u8 vertical MV predictor for block number 3
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* @endcode
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*/
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AV_PKT_DATA_H263_MB_INFO,
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/**
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* This side data should be associated with an audio stream and contains
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* ReplayGain information in form of the AVReplayGain struct.
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*/
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AV_PKT_DATA_REPLAYGAIN,
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/**
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* This side data contains a 3x3 transformation matrix describing an affine
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* transformation that needs to be applied to the decoded video frames for
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* correct presentation.
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*
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* See libavutil/display.h for a detailed description of the data.
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*/
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AV_PKT_DATA_DISPLAYMATRIX,
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/**
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* This side data should be associated with a video stream and contains
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* Stereoscopic 3D information in form of the AVStereo3D struct.
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*/
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AV_PKT_DATA_STEREO3D,
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/**
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* This side data should be associated with an audio stream and corresponds
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* to enum AVAudioServiceType.
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*/
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AV_PKT_DATA_AUDIO_SERVICE_TYPE,
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/**
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* This side data contains quality related information from the encoder.
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* @code
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* u32le quality factor of the compressed frame. Allowed range is between 1 (good) and FF_LAMBDA_MAX (bad).
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* u8 picture type
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* u8 error count
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* u16 reserved
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* u64le[error count] sum of squared differences between encoder in and output
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* @endcode
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*/
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AV_PKT_DATA_QUALITY_STATS,
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/**
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* This side data contains an integer value representing the stream index
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* of a "fallback" track. A fallback track indicates an alternate
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* track to use when the current track can not be decoded for some reason.
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* e.g. no decoder available for codec.
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*/
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AV_PKT_DATA_FALLBACK_TRACK,
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/**
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* This side data corresponds to the AVCPBProperties struct.
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*/
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AV_PKT_DATA_CPB_PROPERTIES,
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/**
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* Recommmends skipping the specified number of samples
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* @code
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* u32le number of samples to skip from start of this packet
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* u32le number of samples to skip from end of this packet
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* u8 reason for start skip
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* u8 reason for end skip (0=padding silence, 1=convergence)
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* @endcode
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*/
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AV_PKT_DATA_SKIP_SAMPLES,
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/**
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* An AV_PKT_DATA_JP_DUALMONO side data packet indicates that
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* the packet may contain "dual mono" audio specific to Japanese DTV
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* and if it is true, recommends only the selected channel to be used.
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* @code
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* u8 selected channels (0=mail/left, 1=sub/right, 2=both)
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* @endcode
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*/
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AV_PKT_DATA_JP_DUALMONO,
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/**
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* A list of zero terminated key/value strings. There is no end marker for
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* the list, so it is required to rely on the side data size to stop.
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*/
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AV_PKT_DATA_STRINGS_METADATA,
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/**
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* Subtitle event position
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* @code
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* u32le x1
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* u32le y1
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* u32le x2
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* u32le y2
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* @endcode
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*/
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AV_PKT_DATA_SUBTITLE_POSITION,
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/**
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* Data found in BlockAdditional element of matroska container. There is
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* no end marker for the data, so it is required to rely on the side data
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* size to recognize the end. 8 byte id (as found in BlockAddId) followed
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* by data.
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*/
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AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
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/**
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* The optional first identifier line of a WebVTT cue.
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*/
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AV_PKT_DATA_WEBVTT_IDENTIFIER,
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/**
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* The optional settings (rendering instructions) that immediately
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* follow the timestamp specifier of a WebVTT cue.
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*/
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AV_PKT_DATA_WEBVTT_SETTINGS,
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/**
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* A list of zero terminated key/value strings. There is no end marker for
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* the list, so it is required to rely on the side data size to stop. This
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* side data includes updated metadata which appeared in the stream.
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*/
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AV_PKT_DATA_METADATA_UPDATE,
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/**
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* MPEGTS stream ID as uint8_t, this is required to pass the stream ID
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* information from the demuxer to the corresponding muxer.
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*/
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AV_PKT_DATA_MPEGTS_STREAM_ID,
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/**
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* Mastering display metadata (based on SMPTE-2086:2014). This metadata
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* should be associated with a video stream and contains data in the form
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* of the AVMasteringDisplayMetadata struct.
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*/
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AV_PKT_DATA_MASTERING_DISPLAY_METADATA,
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/**
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* This side data should be associated with a video stream and corresponds
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* to the AVSphericalMapping structure.
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*/
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AV_PKT_DATA_SPHERICAL,
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/**
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* Content light level (based on CTA-861.3). This metadata should be
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* associated with a video stream and contains data in the form of the
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* AVContentLightMetadata struct.
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*/
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AV_PKT_DATA_CONTENT_LIGHT_LEVEL,
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/**
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* ATSC A53 Part 4 Closed Captions. This metadata should be associated with
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* a video stream. A53 CC bitstream is stored as uint8_t in AVPacketSideData.data.
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* The number of bytes of CC data is AVPacketSideData.size.
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*/
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AV_PKT_DATA_A53_CC,
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/**
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* This side data is encryption initialization data.
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* The format is not part of ABI, use av_encryption_init_info_* methods to
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* access.
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*/
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AV_PKT_DATA_ENCRYPTION_INIT_INFO,
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/**
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* This side data contains encryption info for how to decrypt the packet.
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* The format is not part of ABI, use av_encryption_info_* methods to access.
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*/
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AV_PKT_DATA_ENCRYPTION_INFO,
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/**
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* Active Format Description data consisting of a single byte as specified
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* in ETSI TS 101 154 using AVActiveFormatDescription enum.
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*/
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AV_PKT_DATA_AFD,
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/**
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* Producer Reference Time data corresponding to the AVProducerReferenceTime struct,
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* usually exported by some encoders (on demand through the prft flag set in the
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* AVCodecContext export_side_data field).
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*/
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AV_PKT_DATA_PRFT,
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/**
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* ICC profile data consisting of an opaque octet buffer following the
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* format described by ISO 15076-1.
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*/
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AV_PKT_DATA_ICC_PROFILE,
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/**
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* DOVI configuration
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* ref:
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* dolby-vision-bitstreams-within-the-iso-base-media-file-format-v2.1.2, section 2.2
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* dolby-vision-bitstreams-in-mpeg-2-transport-stream-multiplex-v1.2, section 3.3
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* Tags are stored in struct AVDOVIDecoderConfigurationRecord.
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*/
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AV_PKT_DATA_DOVI_CONF,
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/**
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* The number of side data types.
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* This is not part of the public API/ABI in the sense that it may
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* change when new side data types are added.
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* This must stay the last enum value.
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* If its value becomes huge, some code using it
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* needs to be updated as it assumes it to be smaller than other limits.
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*/
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AV_PKT_DATA_NB
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};
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#define AV_PKT_DATA_QUALITY_FACTOR AV_PKT_DATA_QUALITY_STATS //DEPRECATED
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typedef struct AVPacketSideData {
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uint8_t *data;
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int size;
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enum AVPacketSideDataType type;
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} AVPacketSideData;
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/**
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* This structure stores compressed data. It is typically exported by demuxers
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* and then passed as input to decoders, or received as output from encoders and
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* then passed to muxers.
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*
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* For video, it should typically contain one compressed frame. For audio it may
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* contain several compressed frames. Encoders are allowed to output empty
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* packets, with no compressed data, containing only side data
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* (e.g. to update some stream parameters at the end of encoding).
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*
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* AVPacket is one of the few structs in FFmpeg, whose size is a part of public
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* ABI. Thus it may be allocated on stack and no new fields can be added to it
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* without libavcodec and libavformat major bump.
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*
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* The semantics of data ownership depends on the buf field.
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* If it is set, the packet data is dynamically allocated and is
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* valid indefinitely until a call to av_packet_unref() reduces the
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* reference count to 0.
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*
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* If the buf field is not set av_packet_ref() would make a copy instead
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* of increasing the reference count.
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*
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* The side data is always allocated with av_malloc(), copied by
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* av_packet_ref() and freed by av_packet_unref().
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*
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* @see av_packet_ref
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* @see av_packet_unref
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*/
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typedef struct AVPacket {
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/**
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* A reference to the reference-counted buffer where the packet data is
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* stored.
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* May be NULL, then the packet data is not reference-counted.
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*/
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AVBufferRef *buf;
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/**
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* Presentation timestamp in AVStream->time_base units; the time at which
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* the decompressed packet will be presented to the user.
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* Can be AV_NOPTS_VALUE if it is not stored in the file.
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* pts MUST be larger or equal to dts as presentation cannot happen before
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* decompression, unless one wants to view hex dumps. Some formats misuse
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* the terms dts and pts/cts to mean something different. Such timestamps
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* must be converted to true pts/dts before they are stored in AVPacket.
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*/
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int64_t pts;
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/**
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* Decompression timestamp in AVStream->time_base units; the time at which
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* the packet is decompressed.
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* Can be AV_NOPTS_VALUE if it is not stored in the file.
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*/
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int64_t dts;
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uint8_t *data;
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int size;
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int stream_index;
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/**
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* A combination of AV_PKT_FLAG values
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*/
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int flags;
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/**
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* Additional packet data that can be provided by the container.
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* Packet can contain several types of side information.
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*/
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AVPacketSideData *side_data;
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int side_data_elems;
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/**
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* Duration of this packet in AVStream->time_base units, 0 if unknown.
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* Equals next_pts - this_pts in presentation order.
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*/
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int64_t duration;
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int64_t pos; ///< byte position in stream, -1 if unknown
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#if FF_API_CONVERGENCE_DURATION
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/**
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* @deprecated Same as the duration field, but as int64_t. This was required
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* for Matroska subtitles, whose duration values could overflow when the
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* duration field was still an int.
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*/
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attribute_deprecated
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int64_t convergence_duration;
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#endif
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} AVPacket;
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#define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
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#define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
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/**
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* Flag is used to discard packets which are required to maintain valid
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* decoder state but are not required for output and should be dropped
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* after decoding.
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**/
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#define AV_PKT_FLAG_DISCARD 0x0004
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/**
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* The packet comes from a trusted source.
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*
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* Otherwise-unsafe constructs such as arbitrary pointers to data
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* outside the packet may be followed.
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*/
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#define AV_PKT_FLAG_TRUSTED 0x0008
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/**
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* Flag is used to indicate packets that contain frames that can
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* be discarded by the decoder. I.e. Non-reference frames.
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*/
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#define AV_PKT_FLAG_DISPOSABLE 0x0010
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enum AVSideDataParamChangeFlags {
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AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
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AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
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AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
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AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
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};
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/**
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* Allocate an AVPacket and set its fields to default values. The resulting
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* struct must be freed using av_packet_free().
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*
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* @return An AVPacket filled with default values or NULL on failure.
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*
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* @note this only allocates the AVPacket itself, not the data buffers. Those
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* must be allocated through other means such as av_new_packet.
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*
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* @see av_new_packet
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*/
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AVPacket *av_packet_alloc(void);
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/**
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* Create a new packet that references the same data as src.
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*
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* This is a shortcut for av_packet_alloc()+av_packet_ref().
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*
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* @return newly created AVPacket on success, NULL on error.
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*
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* @see av_packet_alloc
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* @see av_packet_ref
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*/
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AVPacket *av_packet_clone(const AVPacket *src);
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/**
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* Free the packet, if the packet is reference counted, it will be
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* unreferenced first.
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*
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* @param pkt packet to be freed. The pointer will be set to NULL.
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* @note passing NULL is a no-op.
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*/
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void av_packet_free(AVPacket **pkt);
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/**
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* Initialize optional fields of a packet with default values.
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*
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* Note, this does not touch the data and size members, which have to be
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* initialized separately.
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*
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* @param pkt packet
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*/
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void av_init_packet(AVPacket *pkt);
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/**
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* Allocate the payload of a packet and initialize its fields with
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* default values.
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*
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* @param pkt packet
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* @param size wanted payload size
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* @return 0 if OK, AVERROR_xxx otherwise
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*/
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int av_new_packet(AVPacket *pkt, int size);
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/**
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* Reduce packet size, correctly zeroing padding
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*
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* @param pkt packet
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* @param size new size
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*/
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void av_shrink_packet(AVPacket *pkt, int size);
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/**
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* Increase packet size, correctly zeroing padding
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*
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* @param pkt packet
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* @param grow_by number of bytes by which to increase the size of the packet
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*/
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int av_grow_packet(AVPacket *pkt, int grow_by);
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/**
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* Initialize a reference-counted packet from av_malloc()ed data.
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*
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* @param pkt packet to be initialized. This function will set the data, size,
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* and buf fields, all others are left untouched.
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* @param data Data allocated by av_malloc() to be used as packet data. If this
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* function returns successfully, the data is owned by the underlying AVBuffer.
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* The caller may not access the data through other means.
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* @param size size of data in bytes, without the padding. I.e. the full buffer
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* size is assumed to be size + AV_INPUT_BUFFER_PADDING_SIZE.
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*
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* @return 0 on success, a negative AVERROR on error
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*/
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int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
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#if FF_API_AVPACKET_OLD_API
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/**
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* @warning This is a hack - the packet memory allocation stuff is broken. The
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* packet is allocated if it was not really allocated.
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*
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* @deprecated Use av_packet_ref or av_packet_make_refcounted
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*/
|
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attribute_deprecated
|
|
int av_dup_packet(AVPacket *pkt);
|
|
/**
|
|
* Copy packet, including contents
|
|
*
|
|
* @return 0 on success, negative AVERROR on fail
|
|
*
|
|
* @deprecated Use av_packet_ref
|
|
*/
|
|
attribute_deprecated
|
|
int av_copy_packet(AVPacket *dst, const AVPacket *src);
|
|
|
|
/**
|
|
* Copy packet side data
|
|
*
|
|
* @return 0 on success, negative AVERROR on fail
|
|
*
|
|
* @deprecated Use av_packet_copy_props
|
|
*/
|
|
attribute_deprecated
|
|
int av_copy_packet_side_data(AVPacket *dst, const AVPacket *src);
|
|
|
|
/**
|
|
* Free a packet.
|
|
*
|
|
* @deprecated Use av_packet_unref
|
|
*
|
|
* @param pkt packet to free
|
|
*/
|
|
attribute_deprecated
|
|
void av_free_packet(AVPacket *pkt);
|
|
#endif
|
|
/**
|
|
* Allocate new information of a packet.
|
|
*
|
|
* @param pkt packet
|
|
* @param type side information type
|
|
* @param size side information size
|
|
* @return pointer to fresh allocated data or NULL otherwise
|
|
*/
|
|
uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
|
|
int size);
|
|
|
|
/**
|
|
* Wrap an existing array as a packet side data.
|
|
*
|
|
* @param pkt packet
|
|
* @param type side information type
|
|
* @param data the side data array. It must be allocated with the av_malloc()
|
|
* family of functions. The ownership of the data is transferred to
|
|
* pkt.
|
|
* @param size side information size
|
|
* @return a non-negative number on success, a negative AVERROR code on
|
|
* failure. On failure, the packet is unchanged and the data remains
|
|
* owned by the caller.
|
|
*/
|
|
int av_packet_add_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
|
|
uint8_t *data, size_t size);
|
|
|
|
/**
|
|
* Shrink the already allocated side data buffer
|
|
*
|
|
* @param pkt packet
|
|
* @param type side information type
|
|
* @param size new side information size
|
|
* @return 0 on success, < 0 on failure
|
|
*/
|
|
int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
|
|
int size);
|
|
|
|
/**
|
|
* Get side information from packet.
|
|
*
|
|
* @param pkt packet
|
|
* @param type desired side information type
|
|
* @param size If supplied, *size will be set to the size of the side data
|
|
* or to zero if the desired side data is not present.
|
|
* @return pointer to data if present or NULL otherwise
|
|
*/
|
|
uint8_t* av_packet_get_side_data(const AVPacket *pkt, enum AVPacketSideDataType type,
|
|
int *size);
|
|
|
|
#if FF_API_MERGE_SD_API
|
|
attribute_deprecated
|
|
int av_packet_merge_side_data(AVPacket *pkt);
|
|
|
|
attribute_deprecated
|
|
int av_packet_split_side_data(AVPacket *pkt);
|
|
#endif
|
|
|
|
const char *av_packet_side_data_name(enum AVPacketSideDataType type);
|
|
|
|
/**
|
|
* Pack a dictionary for use in side_data.
|
|
*
|
|
* @param dict The dictionary to pack.
|
|
* @param size pointer to store the size of the returned data
|
|
* @return pointer to data if successful, NULL otherwise
|
|
*/
|
|
uint8_t *av_packet_pack_dictionary(AVDictionary *dict, int *size);
|
|
/**
|
|
* Unpack a dictionary from side_data.
|
|
*
|
|
* @param data data from side_data
|
|
* @param size size of the data
|
|
* @param dict the metadata storage dictionary
|
|
* @return 0 on success, < 0 on failure
|
|
*/
|
|
int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict);
|
|
|
|
|
|
/**
|
|
* Convenience function to free all the side data stored.
|
|
* All the other fields stay untouched.
|
|
*
|
|
* @param pkt packet
|
|
*/
|
|
void av_packet_free_side_data(AVPacket *pkt);
|
|
|
|
/**
|
|
* Setup a new reference to the data described by a given packet
|
|
*
|
|
* If src is reference-counted, setup dst as a new reference to the
|
|
* buffer in src. Otherwise allocate a new buffer in dst and copy the
|
|
* data from src into it.
|
|
*
|
|
* All the other fields are copied from src.
|
|
*
|
|
* @see av_packet_unref
|
|
*
|
|
* @param dst Destination packet. Will be completely overwritten.
|
|
* @param src Source packet
|
|
*
|
|
* @return 0 on success, a negative AVERROR on error. On error, dst
|
|
* will be blank (as if returned by av_packet_alloc()).
|
|
*/
|
|
int av_packet_ref(AVPacket *dst, const AVPacket *src);
|
|
|
|
/**
|
|
* Wipe the packet.
|
|
*
|
|
* Unreference the buffer referenced by the packet and reset the
|
|
* remaining packet fields to their default values.
|
|
*
|
|
* @param pkt The packet to be unreferenced.
|
|
*/
|
|
void av_packet_unref(AVPacket *pkt);
|
|
|
|
/**
|
|
* Move every field in src to dst and reset src.
|
|
*
|
|
* @see av_packet_unref
|
|
*
|
|
* @param src Source packet, will be reset
|
|
* @param dst Destination packet
|
|
*/
|
|
void av_packet_move_ref(AVPacket *dst, AVPacket *src);
|
|
|
|
/**
|
|
* Copy only "properties" fields from src to dst.
|
|
*
|
|
* Properties for the purpose of this function are all the fields
|
|
* beside those related to the packet data (buf, data, size)
|
|
*
|
|
* @param dst Destination packet
|
|
* @param src Source packet
|
|
*
|
|
* @return 0 on success AVERROR on failure.
|
|
*/
|
|
int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
|
|
|
|
/**
|
|
* Ensure the data described by a given packet is reference counted.
|
|
*
|
|
* @note This function does not ensure that the reference will be writable.
|
|
* Use av_packet_make_writable instead for that purpose.
|
|
*
|
|
* @see av_packet_ref
|
|
* @see av_packet_make_writable
|
|
*
|
|
* @param pkt packet whose data should be made reference counted.
|
|
*
|
|
* @return 0 on success, a negative AVERROR on error. On failure, the
|
|
* packet is unchanged.
|
|
*/
|
|
int av_packet_make_refcounted(AVPacket *pkt);
|
|
|
|
/**
|
|
* Create a writable reference for the data described by a given packet,
|
|
* avoiding data copy if possible.
|
|
*
|
|
* @param pkt Packet whose data should be made writable.
|
|
*
|
|
* @return 0 on success, a negative AVERROR on failure. On failure, the
|
|
* packet is unchanged.
|
|
*/
|
|
int av_packet_make_writable(AVPacket *pkt);
|
|
|
|
/**
|
|
* Convert valid timing fields (timestamps / durations) in a packet from one
|
|
* timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be
|
|
* ignored.
|
|
*
|
|
* @param pkt packet on which the conversion will be performed
|
|
* @param tb_src source timebase, in which the timing fields in pkt are
|
|
* expressed
|
|
* @param tb_dst destination timebase, to which the timing fields will be
|
|
* converted
|
|
*/
|
|
void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst);
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
#endif // AVCODEC_PACKET_H
|