how to combine multi-IMFSample to one?

Question

I have three IMFSamples and how to combine them to one?

there will be three computers which run my program and they will push IMFSample to me.

and I want to combine them to one. in to same screen.(same texture).

split a texture into 3 and copy one to each of them.

Answer 1

Just set one buffer for the video frame.

IMFSample* pSample = NULL;
	IMFMediaBuffer* pBuffer = NULL;
	const LONG cbWidth = 4 * uiWidth;
	const DWORD cbBuffer = cbWidth * uiHeight;
	BYTE* pData = NULL;
	// Create a new memory buffer.
	hr = MFCreateMemoryBuffer(cbBuffer, &pBuffer);
	// Lock the buffer and copy the video frame to the buffer.
	if (SUCCEEDED(hr)) {
		hr = pBuffer->Lock(&pData, NULL, NULL);
	}
	if (SUCCEEDED(hr)) {
#ifdef REVERSE_IMAGE
		for (int i = 0, j = uiHeight - 1; i < uiHeight; i++, j--)
			for (int k = 0; k < cbWidth; k++)
				pData[(i * cbWidth) + k] = ((BYTE*)rc.pBits)[(j * cbWidth) + k];
#else
		hr = MFCopyImage(pData, cbWidth, (BYTE*)rc.pBits, rc.Pitch, cbWidth, uiHeight);
#endif
	}
	if (pBuffer) {
		pBuffer->Unlock();
	}
	// Set the data length of the buffer.
	if (SUCCEEDED(hr)) {
		hr = pBuffer->SetCurrentLength(cbBuffer);
	}
	// Create a media sample and add the buffer to the sample.
	if (SUCCEEDED(hr)) {
		hr = MFCreateSample(&pSample);
	}
	if (SUCCEEDED(hr)) {
		hr = pSample->AddBuffer(pBuffer);
	}
	// Set the time stamp and the duration.
	if (SUCCEEDED(hr)) {
		hr = pSample->SetSampleTime(rtStart);
	}
	if (SUCCEEDED(hr)) {
		hr = pSample->SetSampleDuration(VIDEO_FRAME_DURATION);
	}
	// Send the sample to the Sink Writer.
	if (SUCCEEDED(hr)) {
		hr = pWriter->WriteSample(streamIndex, pSample);
	}
	hr = pSurface->UnlockRect();
	SafeRelease(&pSample);
	SafeRelease(&pBuffer);
	return hr;

May I ask how did you combine three videos to one from 3 computers? Any samples?