小编mku*_*rek的帖子

我正在编写自定义DirectShow源推送过滤器,它应该从视频服务器接收RTP数据并将它们推送到渲染器.我写了一个CVideoPushPin类,它继承自CSourceStream和CVideoReceiverThread类,它是从视频服务器接收RTP数据包的线程的包装器.接收者线程基本上做了三件事:

• 接收原始RTP数据包并收集Receiver Reports所需的一些数据

• 组装帧,将它们复制到缓冲区并将有关它们的信息存储到256个元素队列中,其定义如下:

  struct queue_elem {
     char *start; // Pointer to a frame in a buffer
     int length; // Lenght of data
     REFERENCE_TIME recvTime; // Timestamp when the frame was received (stream time)
  };
  
  struct data {
     struct queue_elem queue[QUEUE_LENGTH];
     int qWrIdx;
     int qRdIdx;
  HANDLE mutex;
  };
  

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• 每个接收到的帧都用当前流时间加上时间戳

  p->StreamTime(refTime);
  REFERENCE_TIME rt = refTime.GetUnits();
  

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问题是我不知道如何在FillBuffer方法中为每个MediaSample设置时间戳.我尝试了几种方法,但播放要么停止,要么太慢.目前FillBuffer方法如下所示:

   REFERENCE_TIME thisFrameStartTime, thisFrameEndTime;
// Make sure if there are at least 4 frames in the buffer
    if(noOfFrames >= 4)
    {   
        currentQe = m_myData.queue[m_myData.qRdIdx++]; //Take current …