利用微软的avi文件操作函数读取avi文件

最新推荐文章于 2022-03-08 16:35:01 发布

原创最新推荐文章于 2022-03-08 16:35:01 发布 · 867 阅读

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#avi #微软 #null #byte #delete #file

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本文介绍如何使用AVIFile API从AVI文件中读取视频和音频流，并展示了如何获取AVI文件的基本信息，如分辨率、帧数等。

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具体调用如下：

CFileDialog l_FileOpen(TRUE, NULL,
  NULL, OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,"AVI File(*.avi)|*.avi",
  this);
UINT l_bFDRes=l_FileOpen.DoModal();
if(l_bFDRes==IDOK)
{
  m_strFilePath = l_FileOpen.GetPathName();
}
else
{

m_strFilePath = _T("");
AfxMessageBox("请选择一个播放文件！");
}

AVIFileInit();

HRESULT hr;
PAVIFILE pAVIFile = NULL;
hr=AVIFileOpen(&pAVIFile,m_strFilePath,OF_READ,NULL);
if(hr != AVIERR_OK)
{
  if(pAVIFile != NULL)
   AVIFileRelease(pAVIFile);
  return;
}

AVIFILEINFO avi_info;
AVIFileInfo(pAVIFile,&avi_info,sizeof(AVIFILEINFO));

CString szFileInfo;
szFileInfo.Format("Dimention: %d*%d/n"
                 "Length: %d frames/n"
        "Max bytes per second: %d/n"
        "Samples per second: %d/n"
        "Streams: %d/n"
        "File Type: %d",
        avi_info.dwWidth,
        avi_info.dwHeight,
        avi_info.dwLength,
        avi_info.dwMaxBytesPerSec,
        (DWORD)(avi_info.dwRate / avi_info.dwScale),
        avi_info.dwStreams,
        avi_info.szFileType);
// AfxMessageBox(szFileInfo);

DWORD dwVideoWidth = avi_info.dwWidth;
DWORD dwVideoHeight = avi_info.dwHeight;

DWORD dwFrameRate =   (DWORD)(avi_info.dwRate / avi_info.dwScale);
  // Extract stream
PAVISTREAM pVideoStream;
hr=AVIFileGetStream(pAVIFile,&pVideoStream,streamtypeVIDEO,0);
if(hr != AVIERR_OK)
{

  if(pVideoStream != NULL)
   AVIStreamRelease(pVideoStream);

AVIFileExit();
return;
}

BYTE* pVideoStreamBuf = new BYTE[dwVideoWidth*dwVideoHeight*3];
if(pVideoStreamBuf == NULL)
return;
ZeroMemory(pVideoStreamBuf,dwVideoWidth*dwVideoHeight*3);

long lReadBytes = 0;
long lReadFrames = 0;
int i = 0;

for(i= AVIStreamStart(pVideoStream);i<AVIStreamEnd(pVideoStream);i++)
{
  int nRet = AVIStreamRead(pVideoStream,i,1,pVideoStreamBuf,dwVideoWidth*dwVideoHeight*3,&lReadBytes,&lReadFrames);
  Sleep(1000/dwFrameRate);
  if(nRet == 0)
  {
   // 视频数据送去解码显示

}

}

//////////////////////////////////////////////////////////////////////////

//用于做测试，功能未完善，需要做音视频同步，而不是读完视频后再读音频
// Extract Audio stream
PAVISTREAM pAudioStream;
hr=AVIFileGetStream(pAVIFile,&pAudioStream,streamtypeAUDIO,0);
if(hr != AVIERR_OK)
{

if(pAudioStream != NULL)
AVIStreamRelease(pAudioStream);

AVIFileExit();
return;
}

AVISTREAMINFO AudioInfo;
AVIStreamInfo(pAudioStream,&AudioInfo,sizeof(AVISTREAMINFO));

    CString strAudioInfo = _T("");
strAudioInfo.Format("Type:%d,dwRate:%d,dwSampleSize:%d,dwSuggestedBufferSize:%d",
  AudioInfo.fccHandler,
  AudioInfo.dwRate,
  AudioInfo.dwSampleSize,
  AudioInfo.dwSuggestedBufferSize);

// AfxMessageBox(strAudioInfo);

BYTE* pAudioStreamBuf = new BYTE[1024];
if(pAudioStreamBuf == NULL)
return;
ZeroMemory(pAudioStreamBuf,1024);

for(i= AVIStreamStart(pAudioStream);i<AVIStreamEnd(pAudioStream);i++)
{
  int nRet = AVIStreamRead(pAudioStream,i,1,pAudioStreamBuf,8000,&lReadBytes,&lReadFrames);
  if(nRet == 0)
  {
   DT("lReadBytes:%d",lReadBytes);
   //m_MngPlay.DealAudioStream(pAudioStreamBuf,lReadBytes);

// 音频数据送去解码播放

}

}

if(NULL != pVideoStreamBuf)
{
delete[] pVideoStreamBuf;
pVideoStreamBuf = NULL;
}

AVIFileRelease(pAVIFile);
pAVIFile=NULL;