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• avcodec/mediacodec : add mpeg4 encoder

  27 mars 2023, par Samuel Raposo Vieira Mira

  avcodec/mediacodec : add mpeg4 encoder
  This patch will add MPEG4 encoder using Android Mediacodec
  Signed-off-by : Samuel Mira <samuel.mira@qt.io<mailto:samuel.mira@qt.io>>
  
  Signed-off-by : Zhao Zhili <zhilizhao@tencent.com>
  

  • [DH] configure
  • [DH] libavcodec/Makefile
  • [DH] libavcodec/allcodecs.c
  • [DH] libavcodec/mediacodec_wrapper.c
  • [DH] libavcodec/mediacodecenc.c
  • [DH] libavcodec/version.h

• YUV4:2:0 conversion to RGB outputs overly green image

  27 février 2023, par luckybroma

  I'm decoding video and getting YUV 420 frames. In order to render them using D3D11, they need to get converted to RGB (or at least I assume that the render target view cannot be YUV itself).

  


  The YUV frames are all in planar format, meaning UV and not packed. I'm creating 3 textures and ShaderResourceViews of type DXGI_FORMAT_R8G8_UNORM. I'm copying each plane from the frame into it's own ShaderResourceView. I'm then relying on the sampler to account for the differences in size between the Y and UV planes. Black/White only looks great. If I add in color though, I get an overly Green Picture :


  


  I'm at a huge loss of what I could be doing wrong.. I've tried switching the UV and planes around, I've also tried tweaking the conversion values. I'm following Microsoft's guide on picture conversion.

  


  Here is my shader :

  


  min16float4 main(PixelShaderInput input) : SV_TARGET
{
    float y = YChannel.Sample(defaultSampler, input.texCoord).r;
    float u = UChannel.Sample(defaultSampler, input.texCoord).r - 0.5;
    float v = VChannel.Sample(defaultSampler, input.texCoord).r - 0.5;

    float r = y + 1.13983 * v;
    float g = y - 0.39465 * u - 0.58060 * v;
    float b = y + 2.03211 * u;

    return min16float4(r, g, b , 1.f);
}


  


  Creating my ShaderResourceViews :

  


  D3D11_TEXTURE2D_DESC texDesc;
    ZeroMemory(&texDesc, sizeof(texDesc));
    texDesc.Width = 1670;
    texDesc.Height = 626;
    texDesc.MipLevels = 1;
    texDesc.ArraySize = 1;
    texDesc.Format = DXGI_FORMAT_R8_UNORM;
    texDesc.SampleDesc.Count = 1;
    texDesc.SampleDesc.Quality = 0;
    texDesc.Usage = D3D11_USAGE_DYNAMIC;
    texDesc.BindFlags = D3D11_BIND_SHADER_RESOURCE;
    texDesc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;


    dev->CreateTexture2D(&texDesc, NULL, &pYPictureTexture);
    dev->CreateTexture2D(&texDesc, NULL, &pUPictureTexture);
    dev->CreateTexture2D(&texDesc, NULL, &pVPictureTexture);
    
    D3D11_SHADER_RESOURCE_VIEW_DESC shaderResourceViewDesc;
    shaderResourceViewDesc.Format = DXGI_FORMAT_R8_UNORM;
    shaderResourceViewDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2D;
    shaderResourceViewDesc.Texture2D.MostDetailedMip = 0;
    shaderResourceViewDesc.Texture2D.MipLevels = 1;

    dev->CreateShaderResourceView(pYPictureTexture, &shaderResourceViewDesc, &pYPictureTextureResourceView);

    dev->CreateShaderResourceView(pUPictureTexture, &shaderResourceViewDesc, &pUPictureTextureResourceView);
    
    dev->CreateShaderResourceView(pVPictureTexture, &shaderResourceViewDesc, &pVPictureTextureResourceView);



  


  And then How I'm copying the decoded ffmpeg AVFrames :

  


      int height = 626;
    int width = 1670;    

    D3D11_MAPPED_SUBRESOURCE msY;
    D3D11_MAPPED_SUBRESOURCE msU;
    D3D11_MAPPED_SUBRESOURCE msV;
    devcon->Map(pYPictureTexture, 0, D3D11_MAP_WRITE_DISCARD, 0, &msY);

    memcpy(msY.pData, frame->data[0], height * width);
    devcon->Unmap(pYPictureTexture, 0);

    devcon->Map(pUPictureTexture, 0, D3D11_MAP_WRITE_DISCARD, 0, &msU);
    memcpy(msU.pData, frame->data[1], (height*width) / 4);
    devcon->Unmap(pUPictureTexture, 0);


    devcon->Map(pVPictureTexture, 0, D3D11_MAP_WRITE_DISCARD, 0, &msV);
    memcpy(msV.pData, frame->data[2], (height*width) / 4);
    devcon->Unmap(pVPictureTexture, 0);


  


  PS : Happy to provide any more additional requested code ! I just wanted to be concise as possible.

  


• fftools/ffmpeg_mux_init : drop an always-false check

  14 novembre 2022, par Anton Khirnov

  fftools/ffmpeg_mux_init : drop an always-false check
  It cannot be true since 1959351aecf. Effectively reverts 6a3833e1411.
  

  • [DH] fftools/ffmpeg.h
  • [DH] fftools/ffmpeg_demux.c
  • [DH] fftools/ffmpeg_mux_init.c
  • [DH] fftools/ffmpeg_opt.c