3616a音视频同步问题

音频AAC录到文件播放正常，视频RTSP用vlc播放也正常。
把音视频要求RTSP用vlc播放，有音视频数据，视频正常，音频有声音，但声音不对。
分析：
音视频的时间戳不对。重新打音视频的时间戳。

#if (TIME_GET_WAY)
/* PR#2665 fix from Robin
   * Assuming audio format = AFMT_S16_LE
   * Get the current time
   * Substract the time increment of the audio oss buffer, which is equal to
   * buffer_size / channel_number / sample_rate / sample_size ==> 400+ millisec
   */
timeinc = fFrameSize * 1000 / audioNumChannels / (audioSamplingFrequency/1000) ;/// 2;
while (fPresentationTime.tv_usec < timeinc)
{
   fPresentationTime.tv_sec -= 1;
   timeinc -= 1000000;

}

fPresentationTime.tv_usec -= timeinc;

#else
  timeinc = fFrameSize*1000 / audioNumChannels / (audioSamplingFrequency/1000);
  if( IsStart )
  {
          IsStart = 0;
          fPresentationTimePre = fPresentationTime;
          fDurationInMicroseconds = timeinc;
  }else{
        fDurationInMicroseconds = timevaldiff(&fPresentationTimePre, &fPresentationTime )*1000;
        fPresentationTimePre = fPresentationTime;
  }


  if( fDurationInMicroseconds < timeinc)
  {
          unsigned long msec;
          //printf("1.fPresentationTime.tv_sec = %d fPresentationTime.tv_usec = %d \n",fPresentationTime.tv_sec,fPresentationTime.tv_usec);
        msec = fPresentationTime.tv_usec;
          msec += (timeinc - fDurationInMicroseconds);
        fPresentationTime.tv_sec += msec/1000000;
        fPresentationTime.tv_usec = msec%1000000;
        //printf("2.fPresentationTime.tv_sec = %d fPresentationTime.tv_usec = %d \n",fPresentationTime.tv_sec,fPresentationTime.tv_usec);
        fDurationInMicroseconds = timeinc;

        fPresentationTimePre = fPresentationTime;
  }
#endif