Method InitDecoder

decoder/LAVVideo/decoders/avcodec.cpp:297–782

}

STDMETHODIMP CDecAvcodec::InitDecoder(AVCodecID codec, const CMediaType *pmt, const MediaSideDataFFMpeg *pSideData)
{
    DestroyDecoder();
    DbgLog((LOG_TRACE, 10, L"Initializing ffmpeg for codec %S", avcodec_get_name(codec)));

    BITMAPINFOHEADER *pBMI = nullptr;
    videoFormatTypeHandler((const BYTE *)pmt->Format(), pmt->FormatType(), &pBMI);

    if (codec == AV_CODEC_ID_AV1 && IsHardwareAccelerator())
    {
        m_pAVCodec = avcodec_find_decoder_by_name("av1");
    }
    else
    {
        m_pAVCodec = avcodec_find_decoder(codec);
    }
    CheckPointer(m_pAVCodec, VFW_E_UNSUPPORTED_VIDEO);

    m_pAVCtx = avcodec_alloc_context3(m_pAVCodec);
    CheckPointer(m_pAVCtx, E_POINTER);

    DWORD dwDecFlags = m_pCallback->GetDecodeFlags();

    // Use parsing for mpeg1/2 at all times, or H264/HEVC when its not from LAV Splitter
    if (codec == AV_CODEC_ID_MPEG1VIDEO || codec == AV_CODEC_ID_MPEG2VIDEO ||
        (!(dwDecFlags & LAV_VIDEO_DEC_FLAG_LAVSPLITTER) &&
         (pmt->subtype == MEDIASUBTYPE_H264 || pmt->subtype == MEDIASUBTYPE_h264 || pmt->subtype == MEDIASUBTYPE_X264 ||
          pmt->subtype == MEDIASUBTYPE_x264 || pmt->subtype == MEDIASUBTYPE_H264_bis ||
          pmt->subtype == MEDIASUBTYPE_HEVC || pmt->subtype == MEDIASUBTYPE_H265)))
    {
        m_pParser = av_parser_init(codec);
    }

    LONG biRealWidth = pBMI->biWidth, biRealHeight = pBMI->biHeight;
    if (pmt->formattype == FORMAT_VideoInfo || pmt->formattype == FORMAT_MPEGVideo)
    {
        VIDEOINFOHEADER *vih = (VIDEOINFOHEADER *)pmt->Format();
        if (vih->rcTarget.right != 0 && vih->rcTarget.bottom != 0)
        {
            biRealWidth = vih->rcTarget.right;
            biRealHeight = vih->rcTarget.bottom;
        }
    }
    else if (pmt->formattype == FORMAT_VideoInfo2 || pmt->formattype == FORMAT_MPEG2Video)
    {
        VIDEOINFOHEADER2 *vih2 = (VIDEOINFOHEADER2 *)pmt->Format();
        if (vih2->rcTarget.right != 0 && vih2->rcTarget.bottom != 0)
        {
            biRealWidth = vih2->rcTarget.right;
            biRealHeight = vih2->rcTarget.bottom;
        }
    }

    m_pAVCtx->codec_id = codec;
    m_pAVCtx->codec_tag = pBMI->biCompression;
    m_pAVCtx->coded_width = pBMI->biWidth;
    m_pAVCtx->coded_height = abs(pBMI->biHeight);
    m_pAVCtx->bits_per_coded_sample = pBMI->biBitCount;