Question

我正在学习在Windows Media Foundation中使用H.264编码器。

我目前所拥有的是YUV420p格式的媒体样本，因此该缓冲区包含YYYYYYYYUUVV数据。

由于H.264编码器MFT需要以IMFSample的形式输入，我不知道如何将缓冲区中的数据转换为IMFSample。

我可以这样做：

IMFMediaBuffer *pBuffer = NULL;
MFCreateMemoryBuffer(cbSize, &pBuffer);
BYTE *pData = NULL;
pBuffer->Lock(&pData, NULL, NULL);
memcpy(pData, bufferIhaveinYYYYUV format, buffer size); // is it correct?
pBuffer->Unlock();
IMFSample *pSample = NULL;
MFCreateSample(&pSample);
pSample->AddBuffer(pBuffer);

由于

Answer 1

我就是这样做的（https://github.com/sipsorcery/mediafoundationsamples/blob/master/MFMP4ToYUVWithMFT/MFMP4ToYUVWithMFT.cpp完整示例）：

IMFMediaBuffer *srcBuf = NULL;
DWORD srcBufLength;
byte *srcByteBuffer;
DWORD srcBuffCurrLen = 0;
DWORD srcBuffMaxLen = 0;
CHECK_HR(videoSample->ConvertToContiguousBuffer(&srcBuf), "ConvertToContiguousBuffer failed.\n");
CHECK_HR(srcBuf->GetCurrentLength(&srcBufLength), "Get buffer length failed.\n");
CHECK_HR(srcBuf->Lock(&srcByteBuffer, &srcBuffMaxLen, &srcBuffCurrLen), "Error locking source buffer.\n");

//// Now re-constuct.
MFCreateSample(&reConstructedVideoSample);
CHECK_HR(MFCreateMemoryBuffer(srcBufLength, &reConstructedBuffer), "Failed to create memory buffer.\n");
CHECK_HR(reConstructedVideoSample->AddBuffer(reConstructedBuffer), "Failed to add buffer to re-constructed sample.\n");
CHECK_HR(reConstructedVideoSample->SetSampleTime(llVideoTimeStamp), "Error setting the recon video sample time.\n");
CHECK_HR(reConstructedVideoSample->SetSampleDuration(llSampleDuration), "Error setting recon video sample duration.\n");

byte *reconByteBuffer;
DWORD reconBuffCurrLen = 0;
DWORD reconBuffMaxLen = 0;
CHECK_HR(reConstructedBuffer->Lock(&reconByteBuffer, &reconBuffMaxLen, &reconBuffCurrLen), "Error locking recon buffer.\n");
memcpy(reconByteBuffer, srcByteBuffer, srcBuffCurrLen);
CHECK_HR(reConstructedBuffer->Unlock(), "Error unlocking recon buffer.\n");
reConstructedBuffer->SetCurrentLength(srcBuffCurrLen);

如何为WindowsMediaFoundation H.264编码器MFT创建IMFSample

1 个答案: