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vo: disregard system-reported display FPS if it's too imprecise 

If the system-reported display FPS (returned by the VO backends, or
forced with --display-fps) is too imprecise (deviating frame duration by
more than 1%). This works if the display FPS is off by almost 1 (typical
for old/bad/broken OS APIs). Actually it even works if the FPs is
completely wrong.

Is it a good idea? Probably not. It might be better to only output a
warning message. But unless there are reports about it going terribly
wrong, I'll go with this for now.
This commit is contained in:
wm4 2015-11-27 14:36:13 +01:00
parent 85498a0797
commit 41f2c653e2
1 changed files with 42 additions and 13 deletions
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55
video/out/vo.c
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@ -138,8 +138,9 @@ struct vo_internal {
int queued_events; // event mask for the user
int internal_events; // event mask for us
int64_t vsync_interval;
int64_t nominal_vsync_interval;
int64_t vsync_interval;
int64_t *vsync_samples;
int num_vsync_samples;
int64_t prev_vsync;
@ -331,6 +332,17 @@ static void reset_vsync_timings(struct vo *vo)
in->expecting_vsync = false;
}
static double vsync_stddef(struct vo *vo, int64_t ref_vsync)
{
struct vo_internal *in = vo->in;
double jitter = 0;
for (int n = 0; n < in->num_vsync_samples; n++) {
double diff = in->vsync_samples[n] - ref_vsync;
jitter += diff * diff;
}
return sqrt(jitter / in->num_vsync_samples);
}
// Always called locked.
static void update_vsync_timing_after_swap(struct vo *vo)
{
@ -355,15 +367,32 @@ static void update_vsync_timing_after_swap(struct vo *vo)
}
in->prev_vsync = now;
double avg = 0, jitter = 0;
for (int n = 0; n < in->num_vsync_samples; n++) {
avg += in->vsync_samples[n] / 1e6;
double diff = in->vsync_samples[n] / (double)in->vsync_interval - 1.0;
jitter += diff * diff;
double avg = 0;
for (int n = 0; n < in->num_vsync_samples; n++)
avg += in->vsync_samples[n];
in->estimated_vsync_interval = avg / in->num_vsync_samples;
in->estimated_vsync_jitter =
vsync_stddef(vo, in->vsync_interval) / in->vsync_interval;
// Switch to assumed display FPS if it seems "better". (Note that small
// differences are handled as drift instead.)
if (in->num_vsync_samples == max_samples &&
fabs((in->nominal_vsync_interval - in->estimated_vsync_interval))
>= 0.01 * in->nominal_vsync_interval &&
in->estimated_vsync_interval <= 1e6 / 20.0 &&
in->estimated_vsync_interval >= 1e6 / 99.0)
{
double mjitter = vsync_stddef(vo, in->estimated_vsync_interval);
double njitter = vsync_stddef(vo, in->nominal_vsync_interval);
if (mjitter * 1.01 < njitter) {
if (in->vsync_interval == in->nominal_vsync_interval) {
MP_WARN(vo, "Reported display FPS seems incorrect.\n"
"Assuming a value closer to %.3f Hz.\n",
1e6 / in->estimated_vsync_interval);
}
in->vsync_interval = in->estimated_vsync_interval;
}
}
avg /= in->num_vsync_samples;
in->estimated_vsync_interval = avg;
in->estimated_vsync_jitter = sqrt(jitter / in->num_vsync_samples);
MP_STATS(vo, "value %f jitter", in->estimated_vsync_jitter);
MP_STATS(vo, "value %f vsync-diff", in->vsync_samples[0] / 1e6);
@ -422,6 +451,9 @@ static void update_display_fps(struct vo *vo)
in->queued_events |= VO_EVENT_WIN_STATE;
mp_input_wakeup(vo->input_ctx);
}
in->nominal_vsync_interval = in->display_fps > 0 ? 1e6 / in->display_fps : 0;
in->vsync_interval = MPMAX(in->nominal_vsync_interval, 1);
}
pthread_mutex_unlock(&in->lock);
}
@ -682,9 +714,6 @@ static bool render_frame(struct vo *vo)
pthread_mutex_lock(&in->lock);
vo->in->vsync_interval = in->display_fps > 0 ? 1e6 / in->display_fps : 0;
vo->in->vsync_interval = MPMAX(vo->in->vsync_interval, 1);
if (in->frame_queued) {
talloc_free(in->current_frame);
in->current_frame = in->frame_queued;
@ -1051,7 +1080,7 @@ double vo_get_estimated_vsync_interval(struct vo *vo)
{
struct vo_internal *in = vo->in;
pthread_mutex_lock(&in->lock);
double res = in->estimated_vsync_interval;
double res = in->estimated_vsync_interval / 1e6;
pthread_mutex_unlock(&in->lock);
return res;
}