如何为 WindowsMediaFoundation H.264 编码器 MFT 创建 IMFSample

Posted 2023-02-16

【中文标题】如何为 WindowsMediaFoundation H.264 编码器 MFT 创建 IMFSample

【英文标题】：How to create IMFSample for WindowsMediaFoundation H.264 encoder MFT

【发布时间】：2015-06-14 01:52:16

【问题描述】：

我正在学习使用 Windows Media Foundation 中的 H.264 编码器。

我目前拥有的是 YUV420p 格式的媒体样本，所以这是包含 YYYYYYYYUUVV 数据的缓冲区。

由于 H.264 编码器 MFT 需要 IMFSample 形式的输入，我不确定如何将缓冲区中的数据转换为 IMFSample。

我可以这样做吗：

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);

谢谢

【参考方案1】：

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

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);