/// <summary> /// Attempts to read from the transform /// Some useful info here: /// http://msdn.microsoft.com/en-gb/library/windows/desktop/aa965264%28v=vs.85%29.aspx#process_data /// </summary> /// <returns></returns> private int ReadFromTransform() { var outputDataBuffer = new MFT_OUTPUT_DATA_BUFFER[1]; // we have to create our own for var sample = MediaFoundationApi.CreateSample(); var pBuffer = MediaFoundationApi.CreateMemoryBuffer(outputBuffer.Length); sample.AddBuffer(pBuffer); sample.SetSampleTime(outputPosition); // hopefully this is not needed outputDataBuffer[0].pSample = sample; _MFT_PROCESS_OUTPUT_STATUS status; var hr = transform.ProcessOutput(_MFT_PROCESS_OUTPUT_FLAGS.None, 1, outputDataBuffer, out status); if (hr == MediaFoundationErrors.MF_E_TRANSFORM_NEED_MORE_INPUT) { Marshal.ReleaseComObject(pBuffer); Marshal.ReleaseComObject(sample); // nothing to read return(0); } else if (hr != 0) { Marshal.ThrowExceptionForHR(hr); } IMFMediaBuffer outputMediaBuffer; outputDataBuffer[0].pSample.ConvertToContiguousBuffer(out outputMediaBuffer); IntPtr pOutputBuffer; int outputBufferLength; int maxSize; outputMediaBuffer.Lock(out pOutputBuffer, out maxSize, out outputBufferLength); outputBuffer = BufferHelpers.Ensure(outputBuffer, outputBufferLength); Marshal.Copy(pOutputBuffer, outputBuffer, 0, outputBufferLength); outputBufferOffset = 0; outputBufferCount = outputBufferLength; outputMediaBuffer.Unlock(); outputPosition += BytesToNsPosition(outputBufferCount, WaveFormat); // hopefully not needed Marshal.ReleaseComObject(pBuffer); Marshal.ReleaseComObject(sample); Marshal.ReleaseComObject(outputMediaBuffer); return(outputBufferLength); }
/// <summary> /// Attempts to read from the transform /// Some useful info here: /// http://msdn.microsoft.com/en-gb/library/windows/desktop/aa965264%28v=vs.85%29.aspx#process_data /// </summary> /// <returns></returns> private int ReadFromTransform() { var outputDataBuffer = new MFT_OUTPUT_DATA_BUFFER[1]; // we have to create our own for var sample = MediaFoundationApi.CreateSample(); var pBuffer = MediaFoundationApi.CreateMemoryBuffer(outputBuffer.Length); sample.AddBuffer(pBuffer); sample.SetSampleTime(outputPosition); // hopefully this is not needed outputDataBuffer[0].pSample = sample; _MFT_PROCESS_OUTPUT_STATUS status; var hr = transform.ProcessOutput(_MFT_PROCESS_OUTPUT_FLAGS.None, 1, outputDataBuffer, out status); if (hr == MediaFoundationErrors.MF_E_TRANSFORM_NEED_MORE_INPUT) { Marshal.ReleaseComObject(pBuffer); Marshal.ReleaseComObject(sample); // nothing to read return 0; } else if (hr != 0) { Marshal.ThrowExceptionForHR(hr); } IMFMediaBuffer outputMediaBuffer; outputDataBuffer[0].pSample.ConvertToContiguousBuffer(out outputMediaBuffer); IntPtr pOutputBuffer; int outputBufferLength; int maxSize; outputMediaBuffer.Lock(out pOutputBuffer, out maxSize, out outputBufferLength); outputBuffer = BufferHelpers.Ensure(outputBuffer, outputBufferLength); Marshal.Copy(pOutputBuffer, outputBuffer, 0, outputBufferLength); outputBufferOffset = 0; outputBufferCount = outputBufferLength; outputMediaBuffer.Unlock(); outputPosition += BytesToNsPosition(outputBufferCount, WaveFormat); // hopefully not needed Marshal.ReleaseComObject(pBuffer); Marshal.ReleaseComObject(sample); Marshal.ReleaseComObject(outputMediaBuffer); return outputBufferLength; }