Ejemplo n.º 1
0
        /// <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);
        }
Ejemplo n.º 2
0
        /// <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;
        }