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#include "precomp.hpp"

#ifdef HAVE_NVCUVID

void cv::cudacodec::detail::VideoDecoder::create(const FormatInfo& videoFormat)
{
    if (videoFormat.nBitDepthMinus8 > 0 || videoFormat.chromaFormat != YUV420)
        CV_Error(Error::StsUnsupportedFormat, "NV12 output requires 8 bit YUV420");

    cudaVideoCodec _codec = static_cast<cudaVideoCodec>(videoFormat.codec);
    cudaVideoChromaFormat _chromaFormat = static_cast<cudaVideoChromaFormat>(videoFormat.chromaFormat);

    cudaVideoCreateFlags videoCreateFlags = (_codec == cudaVideoCodec_JPEG || _codec == cudaVideoCodec_MPEG2) ?
                                            cudaVideoCreate_PreferCUDA :
                                            cudaVideoCreate_PreferCUVID;

    // Validate video format.  These are the currently supported formats via NVCUVID
    bool codecSupported =   cudaVideoCodec_MPEG1    == _codec ||
                            cudaVideoCodec_MPEG2    == _codec ||
                            cudaVideoCodec_MPEG4    == _codec ||
                            cudaVideoCodec_VC1      == _codec ||
                            cudaVideoCodec_H264     == _codec ||
                            cudaVideoCodec_JPEG     == _codec ||
                            cudaVideoCodec_H264_SVC == _codec ||
                            cudaVideoCodec_H264_MVC == _codec ||
                            cudaVideoCodec_YV12     == _codec ||
                            cudaVideoCodec_NV12     == _codec ||
                            cudaVideoCodec_YUYV     == _codec ||
                            cudaVideoCodec_UYVY     == _codec;

#if defined (HAVE_CUDA)
#if (CUDART_VERSION >= 6500)
    codecSupported |=       cudaVideoCodec_HEVC     == _codec;
#endif
#if  ((CUDART_VERSION == 7500) || (CUDART_VERSION >= 9000))
    codecSupported |=       cudaVideoCodec_VP8      == _codec ||
                            cudaVideoCodec_VP9      == _codec ||
                            cudaVideoCodec_AV1      == _codec ||
                            cudaVideoCodec_YUV420   == _codec;
#endif
#endif

    CV_Assert(codecSupported);
    CV_Assert(  cudaVideoChromaFormat_Monochrome == _chromaFormat ||
                cudaVideoChromaFormat_420        == _chromaFormat ||
                cudaVideoChromaFormat_422        == _chromaFormat ||
                cudaVideoChromaFormat_444        == _chromaFormat);

#if (CUDART_VERSION >= 9000)
    // Check video format is supported by GPU's hardware video decoder
    CUVIDDECODECAPS decodeCaps = {};
    decodeCaps.eCodecType = _codec;
    decodeCaps.eChromaFormat = _chromaFormat;
    decodeCaps.nBitDepthMinus8 = videoFormat.nBitDepthMinus8;
    cuSafeCall(cuCtxPushCurrent(ctx_));
    cuSafeCall(cuvidGetDecoderCaps(&decodeCaps));
    cuSafeCall(cuCtxPopCurrent(NULL));
    if (!decodeCaps.bIsSupported)
        CV_Error(Error::StsUnsupportedFormat, "Video source is not supported by hardware video decoder");

    CV_Assert(videoFormat.width >= decodeCaps.nMinWidth &&
        videoFormat.height >= decodeCaps.nMinHeight &&
        videoFormat.width <= decodeCaps.nMaxWidth &&
        videoFormat.height <= decodeCaps.nMaxHeight);

    CV_Assert((videoFormat.width >> 4)* (videoFormat.height >> 4) <= decodeCaps.nMaxMBCount);
#endif

    // Fill the decoder-create-info struct from the given video-format struct.
    std::memset(&createInfo_, 0, sizeof(CUVIDDECODECREATEINFO));

    // Create video decoder
    createInfo_.CodecType           = _codec;
    createInfo_.ulWidth             = videoFormat.width;
    createInfo_.ulHeight            = videoFormat.height;
    createInfo_.ulNumDecodeSurfaces = FrameQueue::MaximumSize;
    createInfo_.ChromaFormat    = _chromaFormat;
    createInfo_.OutputFormat    = cudaVideoSurfaceFormat_NV12;
    createInfo_.DeinterlaceMode = cudaVideoDeinterlaceMode_Adaptive;

    // No scaling
    static const int MAX_FRAME_COUNT = 2;

    createInfo_.ulTargetWidth       = createInfo_.ulWidth;
    createInfo_.ulTargetHeight      = createInfo_.ulHeight;
    createInfo_.ulNumOutputSurfaces = MAX_FRAME_COUNT;  // We won't simultaneously map more than 8 surfaces
    createInfo_.ulCreationFlags     = videoCreateFlags;
    createInfo_.vidLock = lock_;

    cuSafeCall(cuCtxPushCurrent(ctx_));
    cuSafeCall(cuvidCreateDecoder(&decoder_, &createInfo_));
    cuSafeCall(cuCtxPopCurrent(NULL));
}

void cv::cudacodec::detail::VideoDecoder::release()
{
    if (decoder_)
    {
        cuvidDestroyDecoder(decoder_);
        decoder_ = 0;
    }
}

#endif // HAVE_NVCUVID
