[FFmpeg][HEVC][SCC][Decode]

[fulinjie]

FFmpeg: https://github.com/intel-media-ci/ffmpeg/pull/231

Note that Screen-Extended Main 4:4:4 and 4:4:4 10 supports chroma_format_idc from 0, 1 or 3, hence both 420 and 444 are supported.

However, in MediaLibvaCapsG12::QuerySurfaceAttributes (gen12) for SCCMain444, no 420 format is supported:

    else if(profile == VAProfileHEVCSccMain444)
    {
        //422/444 8/10bit included
        attribs[i].type = VASurfaceAttribPixelFormat;
        attribs[i].value.type = VAGenericValueTypeInteger;
        attribs[i].flags = VA_SURFACE_ATTRIB_GETTABLE | VA_SURFACE_ATTRIB_SETTABLE;
        attribs[i].value.value.i = VA_FOURCC_YUY2;
        i++;

        attribs[i].type = VASurfaceAttribPixelFormat;
        attribs[i].value.type = VAGenericValueTypeInteger;
        attribs[i].flags = VA_SURFACE_ATTRIB_GETTABLE | VA_SURFACE_ATTRIB_SETTABLE;
        attribs[i].value.value.i = VA_FOURCC_Y210;
        i++;

        attribs[i].type = VASurfaceAttribPixelFormat;
        attribs[i].value.type = VAGenericValueTypeInteger;
        attribs[i].flags = VA_SURFACE_ATTRIB_GETTABLE | VA_SURFACE_ATTRIB_SETTABLE;
        attribs[i].value.value.i = VA_FOURCC_AYUV;
        i++;

        attribs[i].type = VASurfaceAttribPixelFormat;
        attribs[i].value.type = VAGenericValueTypeInteger;
        attribs[i].flags = VA_SURFACE_ATTRIB_GETTABLE | VA_SURFACE_ATTRIB_SETTABLE;
        attribs[i].value.value.i = VA_FOURCC_Y410;
        i++;
    }

https://github.com/intel/media-driver/blob/master/media_driver/linux/gen12/ddi/media_libva_caps_g12.cpp#L1124

Summary: Hence driver needs to add caps support for NV12 to enable SCC decoding support.

Here is a work around in FFmpeg for verifying: https://github.com/intel-media-ci/ffmpeg/pull/231/commits/e442c218d3c30208ca9abce282db401b725fcbde

[fulinjie]

Hi @XinfengZhang @Sherry-Lin, would you please help to check?

[wangyan42164]

@fulinjie Could you please try #1001? Thanks.