ffplay: add frame duration estimated from frame rate to VideoPicture

Signed-off-by: Marton Balint <cus@passwd.hu>

ffplay.c

@@ -121,6 +121,7 @@ typedef struct PacketQueue {
 
 typedef struct VideoPicture {
     double pts;             // presentation timestamp for this picture
+    double duration;        // estimated duration based on frame rate
     int64_t pos;            // byte position in file
     SDL_Overlay *bmp;
     int width, height; /* source height & width */
@@ -1549,7 +1550,7 @@ static void duplicate_right_border_pixels(SDL_Overlay *bmp) {
     }
 }
 
-static int queue_picture(VideoState *is, AVFrame *src_frame, double pts, int64_t pos, int serial)
+static int queue_picture(VideoState *is, AVFrame *src_frame, double pts, double duration, int64_t pos, int serial)
 {
     VideoPicture *vp;
 
@@ -1646,6 +1647,7 @@ static int queue_picture(VideoState *is, AVFrame *src_frame, double pts, int64_t
         SDL_UnlockYUVOverlay(vp->bmp);
 
         vp->pts = pts;
+        vp->duration = duration;
         vp->pos = pos;
         vp->serial = serial;
 
@@ -1909,9 +1911,11 @@ static int video_thread(void *arg)
     VideoState *is = arg;
     AVFrame *frame = av_frame_alloc();
     double pts;
+    double duration;
     int ret;
     int serial = 0;
     AVRational tb = is->video_st->time_base;
+    AVRational frame_rate = av_guess_frame_rate(is->ic, is->video_st, NULL);
 
 #if CONFIG_AVFILTER
     AVFilterGraph *graph = avfilter_graph_alloc();
@@ -1962,6 +1966,7 @@ static int video_thread(void *arg)
             last_h = frame->height;
             last_format = frame->format;
             last_serial = serial;
+            frame_rate = filt_out->inputs[0]->frame_rate;
         }
 
         ret = av_buffersrc_add_frame(filt_in, frame);
@@ -1987,8 +1992,9 @@ static int video_thread(void *arg)
                 is->frame_last_filter_delay = 0;
             tb = filt_out->inputs[0]->time_base;
 #endif
+            duration = (frame_rate.num && frame_rate.den ? av_q2d((AVRational){frame_rate.den, frame_rate.num}) : 0);
             pts = (frame->pts == AV_NOPTS_VALUE) ? NAN : frame->pts * av_q2d(tb);
-            ret = queue_picture(is, frame, pts, av_frame_get_pkt_pos(frame), serial);
+            ret = queue_picture(is, frame, pts, duration, av_frame_get_pkt_pos(frame), serial);
             av_frame_unref(frame);
 #if CONFIG_AVFILTER
         }