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player: fix display-sync timing if audio take long on resume 

In display-sync mode, the very first video frame is idiotically fully
timed, even though audio has not been synced yet at this point, and the
video frame is more like a "preview" frame. But since it's fully timed,
an underflow is detected if audio takes longer than the display time of
the frame (we send the second frame only after audio is done).

The timing code will try to compensate for the determined desync, but it
really shouldn't. So explicitly discard the timing info in this specific
case. On the other hand, if the first frame still hasn't finished
display, we can pretend everything is ok.

This is a hack - ideally, we either would send a frame without timing
info (and then send it again or so when playback starts properly), or we
would add real pause support to the VO, and pause it during syncing.
This commit is contained in:
wm4 2016-08-07 14:06:54 +02:00
parent 39ae261cc5
commit 32cc190a55
3 changed files with 15 additions and 0 deletions
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6
player/video.c
View File

@ -1209,6 +1209,12 @@ static void handle_display_sync_frame(struct MPContext *mpctx,
// Likewise, we know sync is off, but is going to be compensated.
time_left += drop_repeat * vsync;
// If syncing took too long, disregard timing of the first frame.
if (mpctx->num_past_frames == 2 && time_left < 0) {
vo_discard_timing_info(vo);
time_left = 0;
}
if (drop_repeat) {
mpctx->mistimed_frames_total += 1;
MP_STATS(mpctx, "mistimed");

8
video/out/vo.c
View File

@ -1096,6 +1096,14 @@ double vo_get_delay(struct vo *vo)
return res ? (res - mp_time_us()) / 1e6 : 0;
}
void vo_discard_timing_info(struct vo *vo)
{
struct vo_internal *in = vo->in;
pthread_mutex_lock(&in->lock);
reset_vsync_timings(vo);
pthread_mutex_unlock(&in->lock);
}
int64_t vo_get_delayed_count(struct vo *vo)
{
struct vo_internal *in = vo->in;

1
video/out/vo.h
View File

@ -366,6 +366,7 @@ double vo_get_estimated_vsync_interval(struct vo *vo);
double vo_get_estimated_vsync_jitter(struct vo *vo);
double vo_get_display_fps(struct vo *vo);
double vo_get_delay(struct vo *vo);
void vo_discard_timing_info(struct vo *vo);
void vo_wakeup(struct vo *vo);
void vo_wait_default(struct vo *vo, int64_t until_time);