ffplay: use get_master_sync_type where necessary

We should make decisions based on the real sync type. This also simplifies
the code.
Signed-off-by: Marton Balint <cus@passwd.hu>

ffplay.c

@@ -1146,8 +1146,7 @@ static double compute_target_delay(double delay, VideoState *is)
     double sync_threshold, diff;
 
     /* update delay to follow master synchronisation source */
-    if (((is->av_sync_type == AV_SYNC_AUDIO_MASTER && is->audio_st) ||
-         is->av_sync_type == AV_SYNC_EXTERNAL_CLOCK)) {
+    if (get_master_sync_type(is) != AV_SYNC_VIDEO_MASTER) {
         /* if video is slave, we try to correct big delays by
            duplicating or deleting a frame */
         diff = get_video_clock(is) - get_master_clock(is);
@@ -1264,7 +1263,7 @@ retry:
             if (is->pictq_size > 1) {
                 VideoPicture *nextvp = &is->pictq[(is->pictq_rindex + 1) % VIDEO_PICTURE_QUEUE_SIZE];
                 duration = nextvp->pts - vp->pts;
-                if((framedrop>0 || (framedrop && is->av_sync_type != AV_SYNC_VIDEO_MASTER)) && time > is->frame_timer + duration){
+                if((framedrop>0 || (framedrop && get_master_sync_type(is) != AV_SYNC_VIDEO_MASTER)) && time > is->frame_timer + duration){
                     is->frame_drops_late++;
                     pictq_next_picture(is);
                     goto retry;
@@ -1582,8 +1581,7 @@ static int get_video_frame(VideoState *is, AVFrame *frame, int64_t *pts, AVPacke
             *pts = 0;
         }
 
-        if (((is->av_sync_type == AV_SYNC_AUDIO_MASTER && is->audio_st) || is->av_sync_type == AV_SYNC_EXTERNAL_CLOCK) &&
-             (framedrop>0 || (framedrop && is->av_sync_type != AV_SYNC_VIDEO_MASTER))) {
+        if (framedrop>0 || (framedrop && get_master_sync_type(is) != AV_SYNC_VIDEO_MASTER)) {
             SDL_LockMutex(is->pictq_mutex);
             if (is->frame_last_pts != AV_NOPTS_VALUE && *pts) {
                 double clockdiff = get_video_clock(is) - get_master_clock(is);
@@ -1941,8 +1939,7 @@ static int synchronize_audio(VideoState *is, int nb_samples)
     int wanted_nb_samples = nb_samples;
 
     /* if not master, then we try to remove or add samples to correct the clock */
-    if (((is->av_sync_type == AV_SYNC_VIDEO_MASTER && is->video_st) ||
-         is->av_sync_type == AV_SYNC_EXTERNAL_CLOCK)) {
+    if (get_master_sync_type(is) != AV_SYNC_AUDIO_MASTER) {
         double diff, avg_diff;
         int min_nb_samples, max_nb_samples;