mirror of
https://github.com/pineappleEA/pineapple-src.git
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651 lines
21 KiB
C
651 lines
21 KiB
C
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/*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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/**
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* @file
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* libavformat API example.
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*
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* Output a media file in any supported libavformat format. The default
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* codecs are used.
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* @example muxing.c
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <math.h>
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#include <libavutil/avassert.h>
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#include <libavutil/channel_layout.h>
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#include <libavutil/opt.h>
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#include <libavutil/mathematics.h>
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#include <libavutil/timestamp.h>
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#include <libavformat/avformat.h>
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#include <libswscale/swscale.h>
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#include <libswresample/swresample.h>
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#define STREAM_DURATION 10.0
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#define STREAM_FRAME_RATE 25 /* 25 images/s */
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#define STREAM_PIX_FMT AV_PIX_FMT_YUV420P /* default pix_fmt */
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#define SCALE_FLAGS SWS_BICUBIC
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// a wrapper around a single output AVStream
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typedef struct OutputStream {
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AVStream *st;
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AVCodecContext *enc;
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/* pts of the next frame that will be generated */
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int64_t next_pts;
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int samples_count;
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AVFrame *frame;
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AVFrame *tmp_frame;
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float t, tincr, tincr2;
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struct SwsContext *sws_ctx;
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struct SwrContext *swr_ctx;
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} OutputStream;
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static void log_packet(const AVFormatContext *fmt_ctx, const AVPacket *pkt)
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{
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AVRational *time_base = &fmt_ctx->streams[pkt->stream_index]->time_base;
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printf("pts:%s pts_time:%s dts:%s dts_time:%s duration:%s duration_time:%s stream_index:%d\n",
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av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, time_base),
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av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, time_base),
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av_ts2str(pkt->duration), av_ts2timestr(pkt->duration, time_base),
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pkt->stream_index);
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}
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static int write_frame(AVFormatContext *fmt_ctx, AVCodecContext *c,
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AVStream *st, AVFrame *frame)
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{
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int ret;
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// send the frame to the encoder
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ret = avcodec_send_frame(c, frame);
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if (ret < 0) {
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fprintf(stderr, "Error sending a frame to the encoder: %s\n",
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av_err2str(ret));
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exit(1);
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}
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while (ret >= 0) {
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AVPacket pkt = { 0 };
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ret = avcodec_receive_packet(c, &pkt);
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if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
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break;
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else if (ret < 0) {
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fprintf(stderr, "Error encoding a frame: %s\n", av_err2str(ret));
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exit(1);
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}
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/* rescale output packet timestamp values from codec to stream timebase */
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av_packet_rescale_ts(&pkt, c->time_base, st->time_base);
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pkt.stream_index = st->index;
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/* Write the compressed frame to the media file. */
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log_packet(fmt_ctx, &pkt);
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ret = av_interleaved_write_frame(fmt_ctx, &pkt);
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av_packet_unref(&pkt);
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if (ret < 0) {
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fprintf(stderr, "Error while writing output packet: %s\n", av_err2str(ret));
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exit(1);
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}
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}
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return ret == AVERROR_EOF ? 1 : 0;
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}
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/* Add an output stream. */
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static void add_stream(OutputStream *ost, AVFormatContext *oc,
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AVCodec **codec,
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enum AVCodecID codec_id)
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{
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AVCodecContext *c;
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int i;
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/* find the encoder */
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*codec = avcodec_find_encoder(codec_id);
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if (!(*codec)) {
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fprintf(stderr, "Could not find encoder for '%s'\n",
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avcodec_get_name(codec_id));
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exit(1);
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}
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ost->st = avformat_new_stream(oc, NULL);
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if (!ost->st) {
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fprintf(stderr, "Could not allocate stream\n");
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exit(1);
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}
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ost->st->id = oc->nb_streams-1;
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c = avcodec_alloc_context3(*codec);
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if (!c) {
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fprintf(stderr, "Could not alloc an encoding context\n");
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exit(1);
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}
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ost->enc = c;
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switch ((*codec)->type) {
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case AVMEDIA_TYPE_AUDIO:
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c->sample_fmt = (*codec)->sample_fmts ?
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(*codec)->sample_fmts[0] : AV_SAMPLE_FMT_FLTP;
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c->bit_rate = 64000;
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c->sample_rate = 44100;
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if ((*codec)->supported_samplerates) {
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c->sample_rate = (*codec)->supported_samplerates[0];
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for (i = 0; (*codec)->supported_samplerates[i]; i++) {
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if ((*codec)->supported_samplerates[i] == 44100)
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c->sample_rate = 44100;
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}
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}
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c->channels = av_get_channel_layout_nb_channels(c->channel_layout);
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c->channel_layout = AV_CH_LAYOUT_STEREO;
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if ((*codec)->channel_layouts) {
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c->channel_layout = (*codec)->channel_layouts[0];
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for (i = 0; (*codec)->channel_layouts[i]; i++) {
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if ((*codec)->channel_layouts[i] == AV_CH_LAYOUT_STEREO)
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c->channel_layout = AV_CH_LAYOUT_STEREO;
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}
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}
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c->channels = av_get_channel_layout_nb_channels(c->channel_layout);
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ost->st->time_base = (AVRational){ 1, c->sample_rate };
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break;
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case AVMEDIA_TYPE_VIDEO:
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c->codec_id = codec_id;
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c->bit_rate = 400000;
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/* Resolution must be a multiple of two. */
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c->width = 352;
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c->height = 288;
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/* timebase: This is the fundamental unit of time (in seconds) in terms
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* of which frame timestamps are represented. For fixed-fps content,
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* timebase should be 1/framerate and timestamp increments should be
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* identical to 1. */
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ost->st->time_base = (AVRational){ 1, STREAM_FRAME_RATE };
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c->time_base = ost->st->time_base;
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c->gop_size = 12; /* emit one intra frame every twelve frames at most */
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c->pix_fmt = STREAM_PIX_FMT;
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if (c->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
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/* just for testing, we also add B-frames */
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c->max_b_frames = 2;
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}
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if (c->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
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/* Needed to avoid using macroblocks in which some coeffs overflow.
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* This does not happen with normal video, it just happens here as
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* the motion of the chroma plane does not match the luma plane. */
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c->mb_decision = 2;
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}
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break;
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default:
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break;
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}
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/* Some formats want stream headers to be separate. */
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if (oc->oformat->flags & AVFMT_GLOBALHEADER)
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c->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
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}
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/**************************************************************/
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/* audio output */
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static AVFrame *alloc_audio_frame(enum AVSampleFormat sample_fmt,
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uint64_t channel_layout,
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int sample_rate, int nb_samples)
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{
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AVFrame *frame = av_frame_alloc();
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int ret;
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if (!frame) {
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fprintf(stderr, "Error allocating an audio frame\n");
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exit(1);
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}
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frame->format = sample_fmt;
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frame->channel_layout = channel_layout;
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frame->sample_rate = sample_rate;
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frame->nb_samples = nb_samples;
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if (nb_samples) {
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ret = av_frame_get_buffer(frame, 0);
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if (ret < 0) {
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fprintf(stderr, "Error allocating an audio buffer\n");
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exit(1);
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}
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}
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return frame;
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}
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static void open_audio(AVFormatContext *oc, AVCodec *codec, OutputStream *ost, AVDictionary *opt_arg)
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{
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AVCodecContext *c;
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int nb_samples;
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int ret;
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AVDictionary *opt = NULL;
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c = ost->enc;
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/* open it */
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av_dict_copy(&opt, opt_arg, 0);
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ret = avcodec_open2(c, codec, &opt);
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av_dict_free(&opt);
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if (ret < 0) {
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fprintf(stderr, "Could not open audio codec: %s\n", av_err2str(ret));
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exit(1);
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}
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/* init signal generator */
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ost->t = 0;
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ost->tincr = 2 * M_PI * 110.0 / c->sample_rate;
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/* increment frequency by 110 Hz per second */
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ost->tincr2 = 2 * M_PI * 110.0 / c->sample_rate / c->sample_rate;
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if (c->codec->capabilities & AV_CODEC_CAP_VARIABLE_FRAME_SIZE)
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nb_samples = 10000;
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else
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nb_samples = c->frame_size;
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ost->frame = alloc_audio_frame(c->sample_fmt, c->channel_layout,
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c->sample_rate, nb_samples);
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ost->tmp_frame = alloc_audio_frame(AV_SAMPLE_FMT_S16, c->channel_layout,
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c->sample_rate, nb_samples);
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/* copy the stream parameters to the muxer */
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ret = avcodec_parameters_from_context(ost->st->codecpar, c);
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if (ret < 0) {
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fprintf(stderr, "Could not copy the stream parameters\n");
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exit(1);
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}
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/* create resampler context */
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ost->swr_ctx = swr_alloc();
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if (!ost->swr_ctx) {
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fprintf(stderr, "Could not allocate resampler context\n");
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exit(1);
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}
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/* set options */
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av_opt_set_int (ost->swr_ctx, "in_channel_count", c->channels, 0);
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av_opt_set_int (ost->swr_ctx, "in_sample_rate", c->sample_rate, 0);
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av_opt_set_sample_fmt(ost->swr_ctx, "in_sample_fmt", AV_SAMPLE_FMT_S16, 0);
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av_opt_set_int (ost->swr_ctx, "out_channel_count", c->channels, 0);
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av_opt_set_int (ost->swr_ctx, "out_sample_rate", c->sample_rate, 0);
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av_opt_set_sample_fmt(ost->swr_ctx, "out_sample_fmt", c->sample_fmt, 0);
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/* initialize the resampling context */
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if ((ret = swr_init(ost->swr_ctx)) < 0) {
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fprintf(stderr, "Failed to initialize the resampling context\n");
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exit(1);
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}
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}
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/* Prepare a 16 bit dummy audio frame of 'frame_size' samples and
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* 'nb_channels' channels. */
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static AVFrame *get_audio_frame(OutputStream *ost)
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{
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AVFrame *frame = ost->tmp_frame;
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int j, i, v;
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int16_t *q = (int16_t*)frame->data[0];
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/* check if we want to generate more frames */
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if (av_compare_ts(ost->next_pts, ost->enc->time_base,
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STREAM_DURATION, (AVRational){ 1, 1 }) > 0)
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return NULL;
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for (j = 0; j <frame->nb_samples; j++) {
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v = (int)(sin(ost->t) * 10000);
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for (i = 0; i < ost->enc->channels; i++)
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*q++ = v;
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ost->t += ost->tincr;
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ost->tincr += ost->tincr2;
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}
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frame->pts = ost->next_pts;
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ost->next_pts += frame->nb_samples;
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return frame;
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}
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/*
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* encode one audio frame and send it to the muxer
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* return 1 when encoding is finished, 0 otherwise
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*/
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static int write_audio_frame(AVFormatContext *oc, OutputStream *ost)
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{
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AVCodecContext *c;
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AVFrame *frame;
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int ret;
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int dst_nb_samples;
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c = ost->enc;
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frame = get_audio_frame(ost);
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if (frame) {
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/* convert samples from native format to destination codec format, using the resampler */
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/* compute destination number of samples */
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dst_nb_samples = av_rescale_rnd(swr_get_delay(ost->swr_ctx, c->sample_rate) + frame->nb_samples,
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c->sample_rate, c->sample_rate, AV_ROUND_UP);
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av_assert0(dst_nb_samples == frame->nb_samples);
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/* when we pass a frame to the encoder, it may keep a reference to it
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* internally;
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* make sure we do not overwrite it here
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*/
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ret = av_frame_make_writable(ost->frame);
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if (ret < 0)
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exit(1);
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/* convert to destination format */
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ret = swr_convert(ost->swr_ctx,
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ost->frame->data, dst_nb_samples,
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(const uint8_t **)frame->data, frame->nb_samples);
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if (ret < 0) {
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fprintf(stderr, "Error while converting\n");
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exit(1);
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}
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frame = ost->frame;
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frame->pts = av_rescale_q(ost->samples_count, (AVRational){1, c->sample_rate}, c->time_base);
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ost->samples_count += dst_nb_samples;
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}
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return write_frame(oc, c, ost->st, frame);
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}
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/**************************************************************/
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/* video output */
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static AVFrame *alloc_picture(enum AVPixelFormat pix_fmt, int width, int height)
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{
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AVFrame *picture;
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int ret;
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picture = av_frame_alloc();
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if (!picture)
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return NULL;
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picture->format = pix_fmt;
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picture->width = width;
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picture->height = height;
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/* allocate the buffers for the frame data */
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ret = av_frame_get_buffer(picture, 0);
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if (ret < 0) {
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fprintf(stderr, "Could not allocate frame data.\n");
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exit(1);
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}
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return picture;
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}
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static void open_video(AVFormatContext *oc, AVCodec *codec, OutputStream *ost, AVDictionary *opt_arg)
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{
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int ret;
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AVCodecContext *c = ost->enc;
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AVDictionary *opt = NULL;
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av_dict_copy(&opt, opt_arg, 0);
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/* open the codec */
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ret = avcodec_open2(c, codec, &opt);
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av_dict_free(&opt);
|
||
|
if (ret < 0) {
|
||
|
fprintf(stderr, "Could not open video codec: %s\n", av_err2str(ret));
|
||
|
exit(1);
|
||
|
}
|
||
|
|
||
|
/* allocate and init a re-usable frame */
|
||
|
ost->frame = alloc_picture(c->pix_fmt, c->width, c->height);
|
||
|
if (!ost->frame) {
|
||
|
fprintf(stderr, "Could not allocate video frame\n");
|
||
|
exit(1);
|
||
|
}
|
||
|
|
||
|
/* If the output format is not YUV420P, then a temporary YUV420P
|
||
|
* picture is needed too. It is then converted to the required
|
||
|
* output format. */
|
||
|
ost->tmp_frame = NULL;
|
||
|
if (c->pix_fmt != AV_PIX_FMT_YUV420P) {
|
||
|
ost->tmp_frame = alloc_picture(AV_PIX_FMT_YUV420P, c->width, c->height);
|
||
|
if (!ost->tmp_frame) {
|
||
|
fprintf(stderr, "Could not allocate temporary picture\n");
|
||
|
exit(1);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/* copy the stream parameters to the muxer */
|
||
|
ret = avcodec_parameters_from_context(ost->st->codecpar, c);
|
||
|
if (ret < 0) {
|
||
|
fprintf(stderr, "Could not copy the stream parameters\n");
|
||
|
exit(1);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/* Prepare a dummy image. */
|
||
|
static void fill_yuv_image(AVFrame *pict, int frame_index,
|
||
|
int width, int height)
|
||
|
{
|
||
|
int x, y, i;
|
||
|
|
||
|
i = frame_index;
|
||
|
|
||
|
/* Y */
|
||
|
for (y = 0; y < height; y++)
|
||
|
for (x = 0; x < width; x++)
|
||
|
pict->data[0][y * pict->linesize[0] + x] = x + y + i * 3;
|
||
|
|
||
|
/* Cb and Cr */
|
||
|
for (y = 0; y < height / 2; y++) {
|
||
|
for (x = 0; x < width / 2; x++) {
|
||
|
pict->data[1][y * pict->linesize[1] + x] = 128 + y + i * 2;
|
||
|
pict->data[2][y * pict->linesize[2] + x] = 64 + x + i * 5;
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static AVFrame *get_video_frame(OutputStream *ost)
|
||
|
{
|
||
|
AVCodecContext *c = ost->enc;
|
||
|
|
||
|
/* check if we want to generate more frames */
|
||
|
if (av_compare_ts(ost->next_pts, c->time_base,
|
||
|
STREAM_DURATION, (AVRational){ 1, 1 }) > 0)
|
||
|
return NULL;
|
||
|
|
||
|
/* when we pass a frame to the encoder, it may keep a reference to it
|
||
|
* internally; make sure we do not overwrite it here */
|
||
|
if (av_frame_make_writable(ost->frame) < 0)
|
||
|
exit(1);
|
||
|
|
||
|
if (c->pix_fmt != AV_PIX_FMT_YUV420P) {
|
||
|
/* as we only generate a YUV420P picture, we must convert it
|
||
|
* to the codec pixel format if needed */
|
||
|
if (!ost->sws_ctx) {
|
||
|
ost->sws_ctx = sws_getContext(c->width, c->height,
|
||
|
AV_PIX_FMT_YUV420P,
|
||
|
c->width, c->height,
|
||
|
c->pix_fmt,
|
||
|
SCALE_FLAGS, NULL, NULL, NULL);
|
||
|
if (!ost->sws_ctx) {
|
||
|
fprintf(stderr,
|
||
|
"Could not initialize the conversion context\n");
|
||
|
exit(1);
|
||
|
}
|
||
|
}
|
||
|
fill_yuv_image(ost->tmp_frame, ost->next_pts, c->width, c->height);
|
||
|
sws_scale(ost->sws_ctx, (const uint8_t * const *) ost->tmp_frame->data,
|
||
|
ost->tmp_frame->linesize, 0, c->height, ost->frame->data,
|
||
|
ost->frame->linesize);
|
||
|
} else {
|
||
|
fill_yuv_image(ost->frame, ost->next_pts, c->width, c->height);
|
||
|
}
|
||
|
|
||
|
ost->frame->pts = ost->next_pts++;
|
||
|
|
||
|
return ost->frame;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* encode one video frame and send it to the muxer
|
||
|
* return 1 when encoding is finished, 0 otherwise
|
||
|
*/
|
||
|
static int write_video_frame(AVFormatContext *oc, OutputStream *ost)
|
||
|
{
|
||
|
return write_frame(oc, ost->enc, ost->st, get_video_frame(ost));
|
||
|
|
||
|
}
|
||
|
|
||
|
static void close_stream(AVFormatContext *oc, OutputStream *ost)
|
||
|
{
|
||
|
avcodec_free_context(&ost->enc);
|
||
|
av_frame_free(&ost->frame);
|
||
|
av_frame_free(&ost->tmp_frame);
|
||
|
sws_freeContext(ost->sws_ctx);
|
||
|
swr_free(&ost->swr_ctx);
|
||
|
}
|
||
|
|
||
|
/**************************************************************/
|
||
|
/* media file output */
|
||
|
|
||
|
int main(int argc, char **argv)
|
||
|
{
|
||
|
OutputStream video_st = { 0 }, audio_st = { 0 };
|
||
|
const char *filename;
|
||
|
AVOutputFormat *fmt;
|
||
|
AVFormatContext *oc;
|
||
|
AVCodec *audio_codec, *video_codec;
|
||
|
int ret;
|
||
|
int have_video = 0, have_audio = 0;
|
||
|
int encode_video = 0, encode_audio = 0;
|
||
|
AVDictionary *opt = NULL;
|
||
|
int i;
|
||
|
|
||
|
if (argc < 2) {
|
||
|
printf("usage: %s output_file\n"
|
||
|
"API example program to output a media file with libavformat.\n"
|
||
|
"This program generates a synthetic audio and video stream, encodes and\n"
|
||
|
"muxes them into a file named output_file.\n"
|
||
|
"The output format is automatically guessed according to the file extension.\n"
|
||
|
"Raw images can also be output by using '%%d' in the filename.\n"
|
||
|
"\n", argv[0]);
|
||
|
return 1;
|
||
|
}
|
||
|
|
||
|
filename = argv[1];
|
||
|
for (i = 2; i+1 < argc; i+=2) {
|
||
|
if (!strcmp(argv[i], "-flags") || !strcmp(argv[i], "-fflags"))
|
||
|
av_dict_set(&opt, argv[i]+1, argv[i+1], 0);
|
||
|
}
|
||
|
|
||
|
/* allocate the output media context */
|
||
|
avformat_alloc_output_context2(&oc, NULL, NULL, filename);
|
||
|
if (!oc) {
|
||
|
printf("Could not deduce output format from file extension: using MPEG.\n");
|
||
|
avformat_alloc_output_context2(&oc, NULL, "mpeg", filename);
|
||
|
}
|
||
|
if (!oc)
|
||
|
return 1;
|
||
|
|
||
|
fmt = oc->oformat;
|
||
|
|
||
|
/* Add the audio and video streams using the default format codecs
|
||
|
* and initialize the codecs. */
|
||
|
if (fmt->video_codec != AV_CODEC_ID_NONE) {
|
||
|
add_stream(&video_st, oc, &video_codec, fmt->video_codec);
|
||
|
have_video = 1;
|
||
|
encode_video = 1;
|
||
|
}
|
||
|
if (fmt->audio_codec != AV_CODEC_ID_NONE) {
|
||
|
add_stream(&audio_st, oc, &audio_codec, fmt->audio_codec);
|
||
|
have_audio = 1;
|
||
|
encode_audio = 1;
|
||
|
}
|
||
|
|
||
|
/* Now that all the parameters are set, we can open the audio and
|
||
|
* video codecs and allocate the necessary encode buffers. */
|
||
|
if (have_video)
|
||
|
open_video(oc, video_codec, &video_st, opt);
|
||
|
|
||
|
if (have_audio)
|
||
|
open_audio(oc, audio_codec, &audio_st, opt);
|
||
|
|
||
|
av_dump_format(oc, 0, filename, 1);
|
||
|
|
||
|
/* open the output file, if needed */
|
||
|
if (!(fmt->flags & AVFMT_NOFILE)) {
|
||
|
ret = avio_open(&oc->pb, filename, AVIO_FLAG_WRITE);
|
||
|
if (ret < 0) {
|
||
|
fprintf(stderr, "Could not open '%s': %s\n", filename,
|
||
|
av_err2str(ret));
|
||
|
return 1;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/* Write the stream header, if any. */
|
||
|
ret = avformat_write_header(oc, &opt);
|
||
|
if (ret < 0) {
|
||
|
fprintf(stderr, "Error occurred when opening output file: %s\n",
|
||
|
av_err2str(ret));
|
||
|
return 1;
|
||
|
}
|
||
|
|
||
|
while (encode_video || encode_audio) {
|
||
|
/* select the stream to encode */
|
||
|
if (encode_video &&
|
||
|
(!encode_audio || av_compare_ts(video_st.next_pts, video_st.enc->time_base,
|
||
|
audio_st.next_pts, audio_st.enc->time_base) <= 0)) {
|
||
|
encode_video = !write_video_frame(oc, &video_st);
|
||
|
} else {
|
||
|
encode_audio = !write_audio_frame(oc, &audio_st);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/* Write the trailer, if any. The trailer must be written before you
|
||
|
* close the CodecContexts open when you wrote the header; otherwise
|
||
|
* av_write_trailer() may try to use memory that was freed on
|
||
|
* av_codec_close(). */
|
||
|
av_write_trailer(oc);
|
||
|
|
||
|
/* Close each codec. */
|
||
|
if (have_video)
|
||
|
close_stream(oc, &video_st);
|
||
|
if (have_audio)
|
||
|
close_stream(oc, &audio_st);
|
||
|
|
||
|
if (!(fmt->flags & AVFMT_NOFILE))
|
||
|
/* Close the output file. */
|
||
|
avio_closep(&oc->pb);
|
||
|
|
||
|
/* free the stream */
|
||
|
avformat_free_context(oc);
|
||
|
|
||
|
return 0;
|
||
|
}
|