C++ (Cpp) Producer::attach примеры использования

Пример #1

Файл: thumbnailprovider.cpp Проект: AresDice/shotcut

QImage ThumbnailProvider::makeThumbnail(Mlt::Producer &producer, int frameNumber, const QSize& requestedSize)
{
    Mlt::Filter scaler(MLT.profile(), "swscale");
    Mlt::Filter converter(MLT.profile(), "avcolor_space");
    int height = PlaylistModel::THUMBNAIL_HEIGHT * 2;
    int width = height * MLT.profile().dar();

    if (!requestedSize.isEmpty()) {
        width = requestedSize.width();
        height = requestedSize.height();
    }

    producer.attach(scaler);
    producer.attach(converter);
    return MLT.image(producer, frameNumber, width, height);
}