Re: [Libav-user] Close a RTSP stream

Jérémy Lugagne Tue, 03 Sep 2013 13:19:59 -0700

Hi,

No body had/have the same issue ?

Jérémy

Le Thu, 22 Aug 2013 10:44:26 +0200, Jeremy Lugagne <[email protected]> a écrit:

Hello all,

I'm using the libav to grab images from a network camera with the rtsp protocol but I have an issue. When I release the stream, my camera don't release resources for the sessions, so when I do 4 tests with my applications I must restart the camera because I have no more slot.

This is how I open the stream :

<code>

  AVFormatContext *pFormatCtx;

  AVCodecContext* vCodecCtxp;

  AVPacket packet;

  AVFrame *pFrame;

  AVFrame *pFrameRGB = NULL;

  int numBytes;

  AVDictionary *optionsDict = NULL;

  struct SwsContext *sws_ctx = NULL;

  uint8_t *buffer = NULL;

  AVCodec *videoCodec;

  av_register_all();

  avformat_network_init();

  pFormatCtx = avformat_alloc_context();

  if(avformat_open_input(&pFormatCtx, qPrintable(url), NULL, 0)!=0)

     return false; // Couldn't open file

  videoStream=-1;

  if(avformat_find_stream_info(pFormatCtx,NULL) < 0){

    return false;

  }

  for(int i=0; i<pFormatCtx->nb_streams; i++) {

    if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO && videoStream < 0) {

      videoStream=i;

    }

  }

  vCodecCtxp = pFormatCtx->streams[videoStream]->codec;

  // Allocate an AVFrame structure

  pFrameRGB = avcodec_alloc_frame();

  pFrame = avcodec_alloc_frame();

  if(pFrameRGB==NULL)  return ;

  // Determine required buffer size and allocate buffer

  numBytes=avpicture_get_size(PIX_FMT_RGB24, vCodecCtxp->width, vCodecCtxp->height);

  buffer=(uint8_t *)av_malloc(numBytes*sizeof(uint8_t));

  sws_ctx = sws_getContext(vCodecCtxp->width, vCodecCtxp->height, vCodecCtxp->pix_fmt, vCodecCtxp->width, vCodecCtxp->height, PIX_FMT_RGB24, SWS_BILINEAR, NULL, NULL, NULL );

  // Assign appropriate parts of buffer to image planes in pFrameRGB. Note that pFrameRGB is an AVFrame, but AVFrame is a superset of AVPicture

  avpicture_fill((AVPicture *)pFrameRGB, buffer, PIX_FMT_RGB24, vCodecCtxp->width, vCodecCtxp->height);



  // Assign appropriate parts of buffer to image planes in pFrameRGB. Note that pFrameRGB is an AVFrame, but AVFrame is a superset of AVPicture

  int res = avpicture_fill((AVPicture *)pFrameRGB, buffer, PIX_FMT_RGB24, vCodecCtxp->width, vCodecCtxp->height);



  videoCodec=avcodec_find_decoder(vCodecCtxp->codec_id);

  avcodec_open2(vCodecCtxp, videoCodec, 0);

  av_read_play(pFormatCtx);

</code>

And how I close it :

<code>

av_free(pFrameRGB);

  av_free(buffer);

  av_free(pFrame);

  sws_freeContext(sws_ctx);

  avformat_close_input(&pFormatCtx);

</code>

Do i forgetting something to close properly my stream ? Because when I watch what messages are sent to the camera I see the TEARDOWN message.

Thanks in advance,

Jeremy L.

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