IT博客-linux-文章分类-ffmpeg studyhttp://www.cnitblog.com/seedshopezhong/category/8626.htmldriverzh-cnWed, 28 Sep 2011 00:21:46 GMTWed, 28 Sep 2011 00:21:46 GMT60猜测输入文件格式http://www.cnitblog.com/seedshopezhong/articles/64917.htmlseedshopezhongseedshopezhongMon, 29 Mar 2010 15:20:00 GMThttp://www.cnitblog.com/seedshopezhong/articles/64917.htmlhttp://www.cnitblog.com/seedshopezhong/comments/64917.htmlhttp://www.cnitblog.com/seedshopezhong/articles/64917.html#Feedback0http://www.cnitblog.com/seedshopezhong/comments/commentRss/64917.htmlhttp://www.cnitblog.com/seedshopezhong/services/trackbacks/64917.html阅读全文

seedshopezhong 2010-03-29 23:20 发表评论
]]>read_ffserver_streams---打开文件并获取文件流信息http://www.cnitblog.com/seedshopezhong/articles/64886.htmlseedshopezhongseedshopezhongSun, 28 Mar 2010 15:58:00 GMThttp://www.cnitblog.com/seedshopezhong/articles/64886.htmlhttp://www.cnitblog.com/seedshopezhong/comments/64886.htmlhttp://www.cnitblog.com/seedshopezhong/articles/64886.html#Feedback0http://www.cnitblog.com/seedshopezhong/comments/commentRss/64886.htmlhttp://www.cnitblog.com/seedshopezhong/services/trackbacks/64886.html

转自：http://blog.csdn.net/woshizhanhun/archive/2009/01/04/3706408.aspx

这是ffmpeg.c里的一段代码，功能是打开文件并绑定音视频流信息到AVFormatContext 这个结构体

  1. static int read_ffserver_streams(AVFormatContext *s, const char *filename)
  2. {
  3.     int i, err;
  4.     AVFormatContext *ic;
  6.     /*打开文件，并将文件相关的信息存到ic中，filename为文件的完整路径*/
  7.     err = av_open_input_file(&ic, filename, NULL, FFM_PACKET_SIZE, NULL);
  8.     if (err < 0)
  9.         return err;
  11.     /*复制文件里的流信息到输出的AVFormatContext结构体中,一般情况有2个流即nb_streams=2，

        s->streams[0]为 视频流，s->streams[1]为音频流*/

  12.     s->nb_streams = ic->nb_streams;
  13.     for(i=0;i<ic->nb_streams;i++) {
  14.         AVStream *st;
  16.         /*修正：需要一个更优化的解决方案*/
  17.         st = av_mallocz(sizeof(AVStream));
  18.         memcpy(st, ic->streams[i], sizeof(AVStream));
  20.         /*初始化编解码器结构体，将文件所用的编码格式存储到用于输出的AVFormatContext结构体中*/
  21.         st->codec = avcodec_alloc_context();
  22.         memcpy(st->codec, ic->streams[i]->codec, sizeof(AVCodecContext));
  23.         s->streams[i] = st;
  24.     }
  25.     /*打开文件后需要关闭*/
  26.     av_close_input_file(ic);
  27.     return 0;
  28. }


seedshopezhong 2010-03-28 23:58 发表评论
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