ffmpeg demexing.c 源码编译

编译出现问题参考：http://blog.csdn.net/chinabinlang/article/details/7823439 解决; 下面代码是我在vs2008上编译通过的版本;

v1.2.1 的库文件参考：http://download.csdn.net/detail/smilestone322/6624047

 

// TestDemux.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"

//int _tmain(int argc, _TCHAR* argv[])
//{
// return 0;
//}
//

/*
* 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
*/
extern "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) {
   /*
   //打印语句编译不过
   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, (AVSampleFormat)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, (AVSampleFormat)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), (AVSampleFormat)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 =(uint8_t **) 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;
}