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我正在使用Windows Media Foundation解碼音頻文件。除了那些表示MF_SOURCE_READERF_CURRENTMEDIATYPECHANGED
的文件之外,我能夠解碼大部分文件。Windows Media Foundation:當前媒體類型更改
如果我在某個時刻更改了當前媒體類型,該如何處理它?
下面是部分代碼:
IMFSourceReader *pSourceReader = NULL;
IMFMediaType *pAudioType= NULL;
CoInitializeEx(NULL, COINIT_APARTMENTTHREADED | COINIT_DISABLE_OLE1DDE);
MFStartup(MF_VERSION);
MFCreateSourceReaderFromURL(filePath, NULL, &pSourceReader);
pSourceReader->SetStreamSelection(MF_SOURCE_READER_FIRST_AUDIO_STREAM, true)
pSourceReader->GetCurrentMediaType(MF_SOURCE_READER_FIRST_AUDIO_STREAM, &pAudioType);
MFCreateMediaType(&pAudioType);
pAudioType->SetGUID(MF_MT_MAJOR_TYPE, MFMediaType_Audio);
pAudioType->SetGUID(MF_MT_SUBTYPE, MFAudioFormat_Float);
pAudioType->SetCurrentMediaType(MF_SOURCE_READER_FIRST_AUDIO_STREAM, NULL, pAudioType);
IMFSample *audioSample = NULL;
DWORD streamIndex, flags;
LONGLONG llAudioTimeStamp;
while (true)
{
pSourceReader->ReadSample(
MF_SOURCE_READER_FIRST_AUDIO_STREAM,
0, // Flags.
&streamIndex, // Receives the actual stream index.
&flags, // Receives status flags.
&llAudioTimeStamp, // Receives the time stamp.
&audioSample) // Receives the sample or NULL.
if (flags & MF_SOURCE_READERF_CURRENTMEDIATYPECHANGED)
{
// what to do here?
}
}
提前非常感謝。