deps/media-playback: Plumb linear alpha flag

deps/media-playback/media-playback/media.c

@@ -419,7 +419,8 @@ static void mp_media_next_video(mp_media_t *m, bool preload)
 
 	frame->width = f->width;
 	frame->height = f->height;
-	frame->flip = flip;
+	frame->flags = flip ? OBS_SOURCE_FRAME_FLIP : 0;
+	frame->flags |= m->is_linear_alpha ? OBS_SOURCE_FRAME_LINEAR_ALPHA : 0;
 
 	if (!m->is_local_file && !d->got_first_keyframe) {
 		if (!f->key_frame)
@@ -803,6 +804,7 @@ bool mp_media_init(mp_media_t *media, const struct mp_media_info *info)
 	media->v_seek_cb = info->v_seek_cb;
 	media->v_preload_cb = info->v_preload_cb;
 	media->force_range = info->force_range;
+	media->is_linear_alpha = info->is_linear_alpha;
 	media->buffering = info->buffering;
 	media->speed = info->speed;
 	media->is_local_file = info->is_local_file;

deps/media-playback/media-playback/media.h

@@ -76,6 +76,7 @@ struct mp_media {
 	enum video_colorspace cur_space;
 	enum video_range_type cur_range;
 	enum video_range_type force_range;
+	bool is_linear_alpha;
 
 	int64_t play_sys_ts;
 	int64_t next_pts_ns;
@@ -119,6 +120,7 @@ struct mp_media_info {
 	int buffering;
 	int speed;
 	enum video_range_type force_range;
+	bool is_linear_alpha;
 	bool hardware_decoding;
 	bool is_local_file;
 	bool reconnecting;