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-rw-r--r--ffmpeg/doc/examples/demuxing.c342
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diff --git a/ffmpeg/doc/examples/demuxing.c b/ffmpeg/doc/examples/demuxing.c
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--- a/ffmpeg/doc/examples/demuxing.c
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-/*
- * Copyright (c) 2012 Stefano Sabatini
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-
-/**
- * @file
- * libavformat demuxing API use example.
- *
- * Show how to use the libavformat and libavcodec API to demux and
- * decode audio and video data.
- * @example doc/examples/demuxing.c
- */
-
-#include <libavutil/imgutils.h>
-#include <libavutil/samplefmt.h>
-#include <libavutil/timestamp.h>
-#include <libavformat/avformat.h>
-
-static AVFormatContext *fmt_ctx = NULL;
-static AVCodecContext *video_dec_ctx = NULL, *audio_dec_ctx;
-static AVStream *video_stream = NULL, *audio_stream = NULL;
-static const char *src_filename = NULL;
-static const char *video_dst_filename = NULL;
-static const char *audio_dst_filename = NULL;
-static FILE *video_dst_file = NULL;
-static FILE *audio_dst_file = NULL;
-
-static uint8_t *video_dst_data[4] = {NULL};
-static int video_dst_linesize[4];
-static int video_dst_bufsize;
-
-static uint8_t **audio_dst_data = NULL;
-static int audio_dst_linesize;
-static int audio_dst_bufsize;
-
-static int video_stream_idx = -1, audio_stream_idx = -1;
-static AVFrame *frame = NULL;
-static AVPacket pkt;
-static int video_frame_count = 0;
-static int audio_frame_count = 0;
-
-static int decode_packet(int *got_frame, int cached)
-{
- int ret = 0;
-
- if (pkt.stream_index == video_stream_idx) {
- /* decode video frame */
- ret = avcodec_decode_video2(video_dec_ctx, frame, got_frame, &pkt);
- if (ret < 0) {
- fprintf(stderr, "Error decoding video frame\n");
- return ret;
- }
-
- if (*got_frame) {
- printf("video_frame%s n:%d coded_n:%d pts:%s\n",
- cached ? "(cached)" : "",
- video_frame_count++, frame->coded_picture_number,
- av_ts2timestr(frame->pts, &video_dec_ctx->time_base));
-
- /* copy decoded frame to destination buffer:
- * this is required since rawvideo expects non aligned data */
- av_image_copy(video_dst_data, video_dst_linesize,
- (const uint8_t **)(frame->data), frame->linesize,
- video_dec_ctx->pix_fmt, video_dec_ctx->width, video_dec_ctx->height);
-
- /* write to rawvideo file */
- fwrite(video_dst_data[0], 1, video_dst_bufsize, video_dst_file);
- }
- } else if (pkt.stream_index == audio_stream_idx) {
- /* decode audio frame */
- ret = avcodec_decode_audio4(audio_dec_ctx, frame, got_frame, &pkt);
- if (ret < 0) {
- fprintf(stderr, "Error decoding audio frame\n");
- return ret;
- }
-
- if (*got_frame) {
- printf("audio_frame%s n:%d nb_samples:%d pts:%s\n",
- cached ? "(cached)" : "",
- audio_frame_count++, frame->nb_samples,
- av_ts2timestr(frame->pts, &audio_dec_ctx->time_base));
-
- ret = av_samples_alloc(audio_dst_data, &audio_dst_linesize, av_frame_get_channels(frame),
- frame->nb_samples, frame->format, 1);
- if (ret < 0) {
- fprintf(stderr, "Could not allocate audio buffer\n");
- return AVERROR(ENOMEM);
- }
-
- /* TODO: extend return code of the av_samples_* functions so that this call is not needed */
- audio_dst_bufsize =
- av_samples_get_buffer_size(NULL, av_frame_get_channels(frame),
- frame->nb_samples, frame->format, 1);
-
- /* copy audio data to destination buffer:
- * this is required since rawaudio expects non aligned data */
- av_samples_copy(audio_dst_data, frame->data, 0, 0,
- frame->nb_samples, av_frame_get_channels(frame), frame->format);
-
- /* write to rawaudio file */
- fwrite(audio_dst_data[0], 1, audio_dst_bufsize, audio_dst_file);
- av_freep(&audio_dst_data[0]);
- }
- }
-
- return ret;
-}
-
-static int open_codec_context(int *stream_idx,
- AVFormatContext *fmt_ctx, enum AVMediaType type)
-{
- int ret;
- AVStream *st;
- AVCodecContext *dec_ctx = NULL;
- AVCodec *dec = NULL;
-
- ret = av_find_best_stream(fmt_ctx, type, -1, -1, NULL, 0);
- if (ret < 0) {
- fprintf(stderr, "Could not find %s stream in input file '%s'\n",
- av_get_media_type_string(type), src_filename);
- return ret;
- } else {
- *stream_idx = ret;
- st = fmt_ctx->streams[*stream_idx];
-
- /* find decoder for the stream */
- dec_ctx = st->codec;
- dec = avcodec_find_decoder(dec_ctx->codec_id);
- if (!dec) {
- fprintf(stderr, "Failed to find %s codec\n",
- av_get_media_type_string(type));
- return ret;
- }
-
- if ((ret = avcodec_open2(dec_ctx, dec, NULL)) < 0) {
- fprintf(stderr, "Failed to open %s codec\n",
- av_get_media_type_string(type));
- return ret;
- }
- }
-
- return 0;
-}
-
-static int get_format_from_sample_fmt(const char **fmt,
- enum AVSampleFormat sample_fmt)
-{
- int i;
- struct sample_fmt_entry {
- enum AVSampleFormat sample_fmt; const char *fmt_be, *fmt_le;
- } sample_fmt_entries[] = {
- { AV_SAMPLE_FMT_U8, "u8", "u8" },
- { AV_SAMPLE_FMT_S16, "s16be", "s16le" },
- { AV_SAMPLE_FMT_S32, "s32be", "s32le" },
- { AV_SAMPLE_FMT_FLT, "f32be", "f32le" },
- { AV_SAMPLE_FMT_DBL, "f64be", "f64le" },
- };
- *fmt = NULL;
-
- for (i = 0; i < FF_ARRAY_ELEMS(sample_fmt_entries); i++) {
- struct sample_fmt_entry *entry = &sample_fmt_entries[i];
- if (sample_fmt == entry->sample_fmt) {
- *fmt = AV_NE(entry->fmt_be, entry->fmt_le);
- return 0;
- }
- }
-
- fprintf(stderr,
- "sample format %s is not supported as output format\n",
- av_get_sample_fmt_name(sample_fmt));
- return -1;
-}
-
-int main (int argc, char **argv)
-{
- int ret = 0, got_frame;
-
- if (argc != 4) {
- fprintf(stderr, "usage: %s input_file video_output_file audio_output_file\n"
- "API example program to show how to read frames from an input file.\n"
- "This program reads frames from a file, decodes them, and writes decoded\n"
- "video frames to a rawvideo file named video_output_file, and decoded\n"
- "audio frames to a rawaudio file named audio_output_file.\n"
- "\n", argv[0]);
- exit(1);
- }
- src_filename = argv[1];
- video_dst_filename = argv[2];
- audio_dst_filename = argv[3];
-
- /* register all formats and codecs */
- av_register_all();
-
- /* open input file, and allocate format context */
- if (avformat_open_input(&fmt_ctx, src_filename, NULL, NULL) < 0) {
- fprintf(stderr, "Could not open source file %s\n", src_filename);
- exit(1);
- }
-
- /* retrieve stream information */
- if (avformat_find_stream_info(fmt_ctx, NULL) < 0) {
- fprintf(stderr, "Could not find stream information\n");
- exit(1);
- }
-
- if (open_codec_context(&video_stream_idx, fmt_ctx, AVMEDIA_TYPE_VIDEO) >= 0) {
- video_stream = fmt_ctx->streams[video_stream_idx];
- video_dec_ctx = video_stream->codec;
-
- video_dst_file = fopen(video_dst_filename, "wb");
- if (!video_dst_file) {
- fprintf(stderr, "Could not open destination file %s\n", video_dst_filename);
- ret = 1;
- goto end;
- }
-
- /* allocate image where the decoded image will be put */
- ret = av_image_alloc(video_dst_data, video_dst_linesize,
- video_dec_ctx->width, video_dec_ctx->height,
- video_dec_ctx->pix_fmt, 1);
- if (ret < 0) {
- fprintf(stderr, "Could not allocate raw video buffer\n");
- goto end;
- }
- video_dst_bufsize = ret;
- }
-
- if (open_codec_context(&audio_stream_idx, fmt_ctx, AVMEDIA_TYPE_AUDIO) >= 0) {
- int nb_planes;
-
- audio_stream = fmt_ctx->streams[audio_stream_idx];
- audio_dec_ctx = audio_stream->codec;
- audio_dst_file = fopen(audio_dst_filename, "wb");
- if (!audio_dst_file) {
- fprintf(stderr, "Could not open destination file %s\n", video_dst_filename);
- ret = 1;
- goto end;
- }
-
- nb_planes = av_sample_fmt_is_planar(audio_dec_ctx->sample_fmt) ?
- audio_dec_ctx->channels : 1;
- audio_dst_data = av_mallocz(sizeof(uint8_t *) * nb_planes);
- if (!audio_dst_data) {
- fprintf(stderr, "Could not allocate audio data buffers\n");
- ret = AVERROR(ENOMEM);
- goto end;
- }
- }
-
- /* dump input information to stderr */
- av_dump_format(fmt_ctx, 0, src_filename, 0);
-
- if (!audio_stream && !video_stream) {
- fprintf(stderr, "Could not find audio or video stream in the input, aborting\n");
- ret = 1;
- goto end;
- }
-
- frame = avcodec_alloc_frame();
- if (!frame) {
- fprintf(stderr, "Could not allocate frame\n");
- ret = AVERROR(ENOMEM);
- goto end;
- }
-
- /* initialize packet, set data to NULL, let the demuxer fill it */
- av_init_packet(&pkt);
- pkt.data = NULL;
- pkt.size = 0;
-
- if (video_stream)
- printf("Demuxing video from file '%s' into '%s'\n", src_filename, video_dst_filename);
- if (audio_stream)
- printf("Demuxing audio from file '%s' into '%s'\n", src_filename, audio_dst_filename);
-
- /* read frames from the file */
- while (av_read_frame(fmt_ctx, &pkt) >= 0) {
- decode_packet(&got_frame, 0);
- av_free_packet(&pkt);
- }
-
- /* flush cached frames */
- pkt.data = NULL;
- pkt.size = 0;
- do {
- decode_packet(&got_frame, 1);
- } while (got_frame);
-
- printf("Demuxing succeeded.\n");
-
- if (video_stream) {
- printf("Play the output video file with the command:\n"
- "ffplay -f rawvideo -pix_fmt %s -video_size %dx%d %s\n",
- av_get_pix_fmt_name(video_dec_ctx->pix_fmt), video_dec_ctx->width, video_dec_ctx->height,
- video_dst_filename);
- }
-
- if (audio_stream) {
- const char *fmt;
-
- if ((ret = get_format_from_sample_fmt(&fmt, audio_dec_ctx->sample_fmt)) < 0)
- goto end;
- printf("Play the output audio file with the command:\n"
- "ffplay -f %s -ac %d -ar %d %s\n",
- fmt, audio_dec_ctx->channels, audio_dec_ctx->sample_rate,
- audio_dst_filename);
- }
-
-end:
- if (video_dec_ctx)
- avcodec_close(video_dec_ctx);
- if (audio_dec_ctx)
- avcodec_close(audio_dec_ctx);
- avformat_close_input(&fmt_ctx);
- if (video_dst_file)
- fclose(video_dst_file);
- if (audio_dst_file)
- fclose(audio_dst_file);
- av_free(frame);
- av_free(video_dst_data[0]);
- av_free(audio_dst_data);
-
- return ret < 0;
-}
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