HRESULT D3DPresentEngine::createVideoSamples(IMFMediaType *format, QList<IMFSample*> &videoSampleQueue)
{
if (!format)
return MF_E_UNEXPECTED;
HRESULT hr = S_OK;
D3DPRESENT_PARAMETERS pp;
IDirect3DSwapChain9 *swapChain = NULL;
IMFSample *videoSample = NULL;
QMutexLocker locker(&m_mutex);
releaseResources();
// Get the swap chain parameters from the media type.
hr = getSwapChainPresentParameters(format, &pp);
if (FAILED(hr))
goto done;
// Create the video samples.
for (int i = 0; i < PRESENTER_BUFFER_COUNT; i++) {
// Create a new swap chain.
hr = m_device->CreateAdditionalSwapChain(&pp, &swapChain);
if (FAILED(hr))
goto done;
// Create the video sample from the swap chain.
hr = createD3DSample(swapChain, &videoSample);
if (FAILED(hr))
goto done;
// Add it to the list.
videoSample->AddRef();
videoSampleQueue.append(videoSample);
// Set the swap chain pointer as a custom attribute on the sample. This keeps
// a reference count on the swap chain, so that the swap chain is kept alive
// for the duration of the sample's lifetime.
hr = videoSample->SetUnknown(MFSamplePresenter_SampleSwapChain, swapChain);
if (FAILED(hr))
goto done;
qt_wmf_safeRelease(&videoSample);
qt_wmf_safeRelease(&swapChain);
}
done:
if (FAILED(hr))
releaseResources();
qt_wmf_safeRelease(&swapChain);
qt_wmf_safeRelease(&videoSample);
return hr;
}
