ffplay: simplify display code

And get rid of frame_queue_prev.
Signed-off-by: Marton Balint <cus@passwd.hu>

ffplay.c

@@ -769,14 +769,6 @@ static void frame_queue_next(FrameQueue *f)
     SDL_UnlockMutex(f->mutex);
 }
 
-/* jump back to the previous frame if available by resetting rindex_shown */
-static int frame_queue_prev(FrameQueue *f)
-{
-    int ret = f->rindex_shown;
-    f->rindex_shown = 0;
-    return ret;
-}
-
 /* return the number of undisplayed frames in the queue */
 static int frame_queue_nb_remaining(FrameQueue *f)
 {
@@ -947,7 +939,7 @@ static void video_image_display(VideoState *is)
     SDL_Rect rect;
     int i;
 
-    vp = frame_queue_peek(&is->pictq);
+    vp = frame_queue_peek_last(&is->pictq);
     if (vp->bmp) {
         if (is->subtitle_st) {
             if (frame_queue_nb_remaining(&is->subpq) > 0) {
@@ -1527,9 +1519,6 @@ static void video_refresh(void *opaque, double *remaining_time)
     }
 
     if (is->video_st) {
-        int redisplay = 0;
-        if (is->force_refresh)
-            redisplay = frame_queue_prev(&is->pictq);
 retry:
         if (frame_queue_nb_remaining(&is->pictq) == 0) {
             // nothing to do, no picture to display in the queue
@@ -1543,11 +1532,10 @@ retry:
 
             if (vp->serial != is->videoq.serial) {
                 frame_queue_next(&is->pictq);
-                redisplay = 0;
                 goto retry;
             }
 
-            if (lastvp->serial != vp->serial && !redisplay)
+            if (lastvp->serial != vp->serial)
                 is->frame_timer = av_gettime_relative() / 1000000.0;
 
             if (is->paused)
@@ -1555,15 +1543,12 @@ retry:
 
             /* compute nominal last_duration */
             last_duration = vp_duration(is, lastvp, vp);
-            if (redisplay)
-                delay = 0.0;
-            else
-                delay = compute_target_delay(last_duration, is);
+            delay = compute_target_delay(last_duration, is);
 
             time= av_gettime_relative()/1000000.0;
-            if (time < is->frame_timer + delay && !redisplay) {
+            if (time < is->frame_timer + delay) {
                 *remaining_time = FFMIN(is->frame_timer + delay - time, *remaining_time);
-                return;
+                goto display;
             }
 
             is->frame_timer += delay;
@@ -1571,18 +1556,16 @@ retry:
                 is->frame_timer = time;
 
             SDL_LockMutex(is->pictq.mutex);
-            if (!redisplay && !isnan(vp->pts))
+            if (!isnan(vp->pts))
                 update_video_pts(is, vp->pts, vp->pos, vp->serial);
             SDL_UnlockMutex(is->pictq.mutex);
 
             if (frame_queue_nb_remaining(&is->pictq) > 1) {
                 Frame *nextvp = frame_queue_peek_next(&is->pictq);
                 duration = vp_duration(is, vp, nextvp);
-                if(!is->step && (redisplay || framedrop>0 || (framedrop && get_master_sync_type(is) != AV_SYNC_VIDEO_MASTER)) && time > is->frame_timer + duration){
-                    if (!redisplay)
-                        is->frame_drops_late++;
+                if(!is->step && (framedrop>0 || (framedrop && get_master_sync_type(is) != AV_SYNC_VIDEO_MASTER)) && time > is->frame_timer + duration){
+                    is->frame_drops_late++;
                     frame_queue_next(&is->pictq);
-                    redisplay = 0;
                     goto retry;
                 }
             }
@@ -1607,16 +1590,16 @@ retry:
                     }
             }
 
-display:
-            /* display picture */
-            if (!display_disable && is->show_mode == SHOW_MODE_VIDEO)
-                video_display(is);
-
             frame_queue_next(&is->pictq);
+            is->force_refresh = 1;
 
             if (is->step && !is->paused)
                 stream_toggle_pause(is);
         }
+display:
+        /* display picture */
+        if (!display_disable && is->force_refresh && is->show_mode == SHOW_MODE_VIDEO && is->pictq.rindex_shown)
+            video_display(is);
     }
     is->force_refresh = 0;
     if (show_status) {