scene注册obs_register_source

obs_init函数中最后一项功能是注册一个输入源:scene类型。这样用户就可以在OBS界面中创建场景了。

static bool obs_init(void)
{
    obs = bzalloc(sizeof(struct obs_core));

    if (!obs_init_data())
        return false;


    if (!obs_init_handlers())
        return false;

    obs_register_source(&scene_info);
    return true;
}

scene_info内容如下：

const struct obs_source_info scene_info =
{
    .id           = "scene",
    .type         = OBS_SOURCE_TYPE_INPUT,
    .output_flags = OBS_SOURCE_VIDEO | OBS_SOURCE_CUSTOM_DRAW,
    .getname      = scene_getname,
    .create       = scene_create,
    .destroy      = scene_destroy,
    .video_render = scene_video_render,
    .getwidth     = scene_getwidth,
    .getheight    = scene_getheight,
    .load         = scene_load,
    .save         = scene_save,
    .enum_sources = scene_enum_sources
};

源的类型有三种：

enum obs_source_type {
    OBS_SOURCE_TYPE_INPUT,
    OBS_SOURCE_TYPE_FILTER,
    OBS_SOURCE_TYPE_TRANSITION,
};

其相关的标识信息output_flags如下：

#define OBS_SOURCE_VIDEO        (1<<0)
#define OBS_SOURCE_AUDIO        (1<<1)
#define OBS_SOURCE_ASYNC        (1<<2) //异步
#define OBS_SOURCE_CUSTOM_DRAW  (1<<3)//如果指定了此标志，video_render回调将传递NULL效果，基于效果的过滤器将不使用直接渲染。
#define OBS_SOURCE_COLOR_MATRIX (1<<4)//源实现YUV->RGB