Media Foundation H.264高CPU使用率

Question

我获得了高CPU使用率，在Media Foundation .Net上在接收器上编写流。下面是我如何初始化sinkwriter。

private int InitializeSinkWriter(String outputFile, int videoWidth, int videoHeight)
    {
        IMFMediaType mediaTypeIn = null;
        IMFMediaType mediaTypeOut = null;
        IMFAttributes attributes = null;

        int hr = 0;

        if (Succeeded(hr)) hr = (int)MFExtern.MFCreateAttributes(out attributes, 1);
        if (Succeeded(hr)) hr = (int)attributes.SetUINT32(MFAttributesClsid.MF_READWRITE_ENABLE_HARDWARE_TRANSFORMS, 1);
        if (Succeeded(hr)) hr = (int)attributes.SetUINT32(MFAttributesClsid.MF_SINK_WRITER_DISABLE_THROTTLING, 1);
        if (Succeeded(hr)) hr = (int)attributes.SetUINT32(MFAttributesClsid.MF_LOW_LATENCY, 1);

        // Create the sink writer 
        if (Succeeded(hr)) hr = (int)MFExtern.MFCreateSinkWriterFromURL(outputFile, null, attributes, out sinkWriter);

        // Create the output type
        if (Succeeded(hr)) hr = (int)MFExtern.MFCreateMediaType(out mediaTypeOut);
        if (Succeeded(hr)) hr = (int)mediaTypeOut.SetGUID(MFAttributesClsid.MF_MT_MAJOR_TYPE, MFMediaType.Video);
        if (Succeeded(hr)) hr = (int)mediaTypeOut.SetGUID(MFAttributesClsid.MF_TRANSCODE_CONTAINERTYPE, MFTranscodeContainerType.MPEG4);
        if (Succeeded(hr)) hr = (int)mediaTypeOut.SetGUID(MFAttributesClsid.MF_MT_SUBTYPE, MFMediaType.H264);
        if (Succeeded(hr)) hr = (int)mediaTypeOut.SetUINT32(MFAttributesClsid.MF_MT_AVG_BITRATE, videoBitRate);
        if (Succeeded(hr)) hr = (int)mediaTypeOut.SetUINT32(MFAttributesClsid.MF_MT_INTERLACE_MODE, (int)MFVideoInterlaceMode.Progressive);
        if (Succeeded(hr)) hr = (int)MFExtern.MFSetAttributeSize(mediaTypeOut, MFAttributesClsid.MF_MT_FRAME_SIZE, videoWidth, videoHeight);
        if (Succeeded(hr)) hr = (int)MFExtern.MFSetAttributeRatio(mediaTypeOut, MFAttributesClsid.MF_MT_FRAME_RATE, VIDEO_FPS, 1);
        if (Succeeded(hr)) hr = (int)MFExtern.MFSetAttributeRatio(mediaTypeOut, MFAttributesClsid.MF_MT_PIXEL_ASPECT_RATIO, 1, 1);
        if (Succeeded(hr)) hr = (int)sinkWriter.AddStream(mediaTypeOut, out streamIndex);

        // Create the input type 
        if (Succeeded(hr)) hr = (int)MFExtern.MFCreateMediaType(out mediaTypeIn);
        if (Succeeded(hr)) hr = (int)mediaTypeIn.SetGUID(MFAttributesClsid.MF_MT_MAJOR_TYPE, MFMediaType.Video);
        if (Succeeded(hr)) hr = (int)mediaTypeIn.SetGUID(MFAttributesClsid.MF_MT_SUBTYPE, MFMediaType.RGB32);
        if (Succeeded(hr)) hr = (int)mediaTypeIn.SetUINT32(MFAttributesClsid.MF_MT_INTERLACE_MODE, (int)MFVideoInterlaceMode.Progressive);
        if (Succeeded(hr)) hr = (int)MFExtern.MFSetAttributeSize(mediaTypeIn, MFAttributesClsid.MF_MT_FRAME_SIZE, videoWidth, videoHeight);
        if (Succeeded(hr)) hr = (int)MFExtern.MFSetAttributeRatio(mediaTypeIn, MFAttributesClsid.MF_MT_FRAME_RATE, VIDEO_FPS, 1);
        if (Succeeded(hr)) hr = (int)MFExtern.MFSetAttributeRatio(mediaTypeIn, MFAttributesClsid.MF_MT_PIXEL_ASPECT_RATIO, 1, 1);
        if (Succeeded(hr)) hr = (int)sinkWriter.SetInputMediaType(streamIndex, mediaTypeIn, null);


        // Start accepting data
        if (Succeeded(hr)) hr = (int)sinkWriter.BeginWriting();


        COMBase.SafeRelease(mediaTypeOut);
        COMBase.SafeRelease(mediaTypeIn);


        return hr;
    }

这就是在sinkwriter上添加样本的方式。

 IMFSample sample = null;
        IMFMediaBuffer buffer = null;


        IntPtr data = new IntPtr();
        int bufferMaxLength;
        int bufferCurrentLength;

        int hr = (int)MFExtern.MFCreateMemoryBuffer(frameSizeBytes, out buffer);

        if (Succeeded(hr)) hr = (int)buffer.Lock(out data, out bufferMaxLength, out bufferCurrentLength);
        if (Succeeded(hr))
        {
                hr = (int)MFExtern.MFCopyImage(
                    data,                                       // Destination buffer.
                    videoWidth * BYTES_PER_PIXEL,               // Destination stride.
                    (IntPtr)(frame.frame.DataPointer + (videoHeight - 1) * frame.frame.RowPitch),                    // First row in source image.
                    -frame.frame.RowPitch,                       // Source stride.
                    videoWidth * BYTES_PER_PIXEL,               // Destination stride.
                    videoHeight                                 // Image height in pixels
                    );
        }

        if (Succeeded(hr)) hr = (int)buffer.Unlock();
        if (Succeeded(hr)) hr = (int)buffer.SetCurrentLength(frameSizeBytes);
        if (Succeeded(hr)) hr = (int)MFExtern.MFCreateSample(out sample);
        if (Succeeded(hr)) hr = (int)sample.AddBuffer(buffer);
        if (Succeeded(hr)) hr = (int)sample.SetSampleTime(frame.prevRecordingDuration);
        if (Succeeded(hr)) hr = (int)sample.SetSampleDuration((frame.recordDuration-frame.prevRecordingDuration));

        if (Succeeded(hr)) hr = (int)sinkWriter.WriteSample(streamIndex, sample);

        COMBase.SafeRelease(sample);
        COMBase.SafeRelease(buffer);

当我注释掉if (Succeeded(hr)) hr = (int)sinkWriter.WriteSample(streamIndex, sample);

时

CPU只有10％以下，但当我激活写入样本时，它上升到50％。任何人都可以帮我如何使用硬件编码？谢谢我使用c＃。