Method InitOutputFormat

src/vapoursynth/vapoursource4.cpp:315–387

}

void VSVideoSource4::InitOutputFormat(int ResizeToWidth, int ResizeToHeight,
    const char *ResizerName, int ConvertToFormat, const VSAPI *vsapi, VSCore *core) {

    char ErrorMsg[1024];
    FFMS_ErrorInfo E;
    E.Buffer = ErrorMsg;
    E.BufferSize = sizeof(ErrorMsg);

    const FFMS_Frame *F = FFMS_GetFrame(V, 0, &E);
    if (!F) {
        std::string buf = "Source: ";
        buf += E.Buffer;
        throw std::runtime_error(buf);
    }

    std::vector<int> TargetFormats;
    int npixfmt = GetNumPixFmts();
    for (int i = 0; i < npixfmt; i++)
        if (IsRealNativeEndianPlanar(*av_pix_fmt_desc_get((AVPixelFormat)i)))
            TargetFormats.push_back(i);
    TargetFormats.push_back(AV_PIX_FMT_NONE);

    int TargetPixelFormat = AV_PIX_FMT_NONE;
    if (ConvertToFormat != pfNone) {
        TargetPixelFormat = FormatConversionToPixelFormat(ConvertToFormat, OutputAlpha, core, vsapi);
        if (TargetPixelFormat == AV_PIX_FMT_NONE)
            throw std::runtime_error(std::string("Source: Invalid output colorspace specified"));

        TargetFormats.clear();
        TargetFormats.push_back(TargetPixelFormat);
        TargetFormats.push_back(-1);
    }

    if (ResizeToWidth <= 0)
        ResizeToWidth = F->EncodedWidth;

    if (ResizeToHeight <= 0)
        ResizeToHeight = F->EncodedHeight;

    int Resizer = ResizerNameToSWSResizer(ResizerName);
    if (Resizer == 0)
        throw std::runtime_error(std::string("Source: Invalid resizer name specified"));

    if (FFMS_SetOutputFormatV2(V, &TargetFormats[0],
        ResizeToWidth, ResizeToHeight, Resizer, &E))
        throw std::runtime_error(std::string("Source: No suitable output format found"));

    F = FFMS_GetFrame(V, 0, &E);
    TargetFormats.clear();
    TargetFormats.push_back(F->ConvertedPixelFormat);
    TargetFormats.push_back(-1);

    // This trick is required to first get the "best" default format and then set only that format as the output
    if (FFMS_SetOutputFormatV2(V, TargetFormats.data(), ResizeToWidth, ResizeToHeight, Resizer, &E))
        throw std::runtime_error(std::string("Source: No suitable output format found"));

    F = FFMS_GetFrame(V, 0, &E);