Capture.cpp

    unsigned char param_buffer[1024];
    spa_pod_builder builder = SPA_POD_BUILDER_INIT(param_buffer, sizeof(param_buffer));
    const spa_pod *params[1];
    params[0] = (spa_pod*)spa_pod_builder_add_object(&builder,
        SPA_TYPE_OBJECT_Format, SPA_PARAM_EnumFormat,
        SPA_FORMAT_mediaType,       SPA_POD_Id(SPA_MEDIA_TYPE_video),
        SPA_FORMAT_mediaSubtype,    SPA_POD_Id(SPA_MEDIA_SUBTYPE_raw),
        // TODO: test what happens if we don't support any formats
        SPA_FORMAT_VIDEO_format,    SPA_POD_CHOICE_ENUM_Id(3,
                                    SPA_VIDEO_FORMAT_YUY2, // default
                                    // TODO: find a device that has i420 and/or nv12 and test that
                                    //       this may not exist though, it's possible all desktop capturers use some form of RGB
                                    //SPA_VIDEO_FORMAT_I420, // alternative
                                    SPA_VIDEO_FORMAT_YUY2, // alternative
                                    //SPA_VIDEO_FORMAT_RGB, // alternative
                                    //SPA_VIDEO_FORMAT_RGBA,
                                    //SPA_VIDEO_FORMAT_RGBx,
                                    SPA_VIDEO_FORMAT_BGRx), // alternative
        SPA_FORMAT_VIDEO_size,      SPA_POD_CHOICE_RANGE_Rectangle(
                                        &SPA_RECTANGLE((unsigned)size_.width(), (unsigned)size_.height()), // default
                                        &SPA_RECTANGLE(1, 1), // min
                                        &SPA_RECTANGLE(999999, 999999) // max
                                    ),
        SPA_FORMAT_VIDEO_framerate, SPA_POD_CHOICE_RANGE_Fraction(
                                    &SPA_FRACTION(25, 1),
                                    &SPA_FRACTION(0, 1),
                                    &SPA_FRACTION(1000, 1)));