SharpDX MapSubresource 是垂直翻转的 C#

Question

如何翻转 SharpDX.Databox 而不将其转换为位图？我正在使用 SharpDX 和 Media foundation 进行屏幕录制。下面是我如何获取 Databox 的代码。

mapSource = device.ImmediateContext.MapSubresource(screenTexture, 0,SharpDX.Direct3D11.MapMode.Read, SharpDX.Direct3D11.MapFlags.None);

但是当我在 mediafoundation.net 中传递 mapSource 时，我制作了一个垂直视频。

        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, videoWidth * BYTES_PER_PIXEL, mapSource.DataPointer, videoWidth * BYTES_PER_PIXEL, videoWidth * BYTES_PER_PIXEL, videoHeight);
        }
        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.Ticks);//(TICKS_PER_SECOND * frames / VIDEO_FPS);
        if (Succeeded(hr)) hr = (int)sample.SetSampleDuration((frame.recordDuration-frame.prevRecordingDuration).Ticks);
        if (Succeeded(hr)) hr = (int)sinkWriter.WriteSample(streamIndex, sample);
        if (Succeeded(hr)) frames++;

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

enter image description here

Answer 1

在您的代码中，MFCopyImage 代码中存在错误。根据 MFCopyImage function you must set _In_ LONG lDestStride, _In_ const BYTE *pSrc, _In_ LONG lSrcStride, - lDestStride and lSrcStride - is width of memory for storing one line of pixels - your computing videoWidth * BYTES_PER_PIXEL is not correct, because for Windows RGB format stride can be widther than videoWidth * BYTES_PER_PIXEL. You must compute destination stride by function MFGetStrideForBitmapInfoHeader，source stride 你可以从你的图像源代码中获得 - 我不知道你的代码，但对于我的项目我使用了

D3D11_MAPPED_SUBRESOURCE resource;
                UINT subresource = D3D11CalcSubresource(0, 0, 0);
                ctx->Map(mDestImage, subresource, D3D11_MAP_READ_WRITE, 0, &resource);
                LOG_INVOKE_MF_FUNCTION(MFCopyImage,
                    aPtrData,
                    mStride,
                    (BYTE*)resource.pData,
                    resource.RowPitch,

行距。

此致。

P.S。 Destination stride mStride 可以是负数——这意味着它需要从最后一行写到第一行。它可以通过下一次更改目标指针来完成 - aPtrData += (mHeight - 1)*mStride;

SharpDX MapSubresource 是垂直翻转的 C#

SharpDX MapSubresource is vertically flipped C#

directx

ms-media-foundation

sharpdx

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