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player: choose speed of smallest acceptable factor for display sync

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Instead of choosing based on smallest deviation from set speed,
use the speed change from the smallest factor that does not
exceed `video-sync-max-video-change`.
This commit is contained in:
Christoph Heinrich 2022-08-06 03:45:59 +02:00 committed by Dudemanguy
parent de9f375a23
commit 67321b1440
1 changed files with 13 additions and 16 deletions

29
player/video.c
View File

@ -666,20 +666,16 @@ double calc_average_frame_duration(struct MPContext *mpctx)
// effective video FPS. If this is not possible, try to do it for multiples,
// which still leads to an improved end result.
// Both parameters are durations in seconds.
static double calc_best_speed(double vsync, double frame, int max_factor)
static double calc_best_speed(double vsync, double frame,
double max_change, int max_factor)
{
double ratio = frame / vsync;
double best_scale = -1;
double best_dev = INFINITY;
for (int factor = 1; factor <= max_factor; factor++) {
double scale = ratio * factor / rint(ratio * factor);
double dev = fabs(scale - 1);
if (dev < best_dev) {
best_scale = scale;
best_dev = dev;
}
if (fabs(scale - 1) <= max_change)
return scale;
}
return best_scale;
return -1;
}
static double find_best_speed(struct MPContext *mpctx, double vsync)
@ -690,10 +686,15 @@ static double find_best_speed(struct MPContext *mpctx, double vsync)
double dur = mpctx->past_frames[n].approx_duration;
if (dur <= 0)
continue;
total += calc_best_speed(vsync, dur / mpctx->opts->playback_speed,
double best = calc_best_speed(vsync, dur / mpctx->opts->playback_speed,
mpctx->opts->sync_max_video_change / 100,
mpctx->opts->sync_max_factor);
if (best <= 0)
continue;
total += best;
num++;
}
// If it doesn't work, play at normal speed.
return num > 0 ? total / num : 1;
}
@ -828,12 +829,8 @@ static void handle_display_sync_frame(struct MPContext *mpctx,
return;
mpctx->speed_factor_v = 1.0;
if (mode != VS_DISP_VDROP) {
double best = find_best_speed(mpctx, vsync);
// If it doesn't work, play at normal speed.
if (fabs(best - 1.0) <= opts->sync_max_video_change / 100)
mpctx->speed_factor_v = best;
}
if (mode != VS_DISP_VDROP)
mpctx->speed_factor_v = find_best_speed(mpctx, vsync);
// Determine for how many vsyncs a frame should be displayed. This can be
// e.g. 2 for 30hz on a 60hz display. It can also be 0 if the video