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jack: improve current_usec calculation

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We should not use nsec from the clock as the current_usec because
current_usec is supposed to be an idealized time when the wakeup would
have happened and nsec is when it actually happened.

Instead use next_nsec and subtract the rate corrected period from it to
get the idealized current_usec.

We can still use nsec to calculate the elapsed time since the wakeup and
be sure that it is always in the past.
This commit is contained in:
Wim Taymans 2023-12-12 13:03:11 +01:00
parent e4d6cca32a
commit 74f48a2bec
1 changed files with 15 additions and 13 deletions
Download patch file Download diff file Expand all files Collapse all files

28
pipewire-jack/src/pipewire-jack.c
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@ -6402,7 +6402,7 @@ jack_nframes_t jack_frames_since_cycle_start (const jack_client_t *client)
{
struct client *c = (struct client *) client;
struct frame_times times;
uint64_t diff;
int64_t diff;
return_val_if_fail(c != NULL, 0);
@ -6444,14 +6444,14 @@ int jack_get_cycle_times(const jack_client_t *client,
get_frame_times(c, &times);
*current_frames = times.frames;
*current_usecs = times.nsec / SPA_NSEC_PER_USEC;
*next_usecs = times.next_nsec / SPA_NSEC_PER_USEC;
if (times.sample_rate == 0 || times.rate_diff == 0.0)
*period_usecs = (times.next_nsec - times.nsec) / SPA_NSEC_PER_USEC;
else
*period_usecs = times.buffer_frames *
return -1;
*current_frames = times.frames;
*next_usecs = times.next_nsec / SPA_NSEC_PER_USEC;
*period_usecs = times.buffer_frames *
(float)SPA_USEC_PER_SEC / (times.sample_rate * times.rate_diff);
*current_usecs = *next_usecs - (jack_time_t)*period_usecs;
pw_log_trace("%p: %d %"PRIu64" %"PRIu64" %f", c, *current_frames,
*current_usecs, *next_usecs, *period_usecs);
@ -6468,14 +6468,15 @@ jack_time_t jack_frames_to_time(const jack_client_t *client, jack_nframes_t fram
get_frame_times(c, &times);
if (times.buffer_frames == 0)
if (times.buffer_frames == 0 || times.sample_rate == 0 || times.rate_diff == 0.0)
return 0;
uint32_t nf = (uint32_t)times.frames;
uint64_t w = times.nsec/SPA_NSEC_PER_USEC;
uint64_t nw = times.next_nsec/SPA_NSEC_PER_USEC;
uint64_t dp = (uint64_t)(times.buffer_frames *
(float)SPA_USEC_PER_SEC / (times.sample_rate * times.rate_diff));
uint64_t w = nw - dp;
int32_t df = frames - nf;
int64_t dp = nw - w;
return w + (int64_t)rint((double) df * (double) dp / times.buffer_frames);
}
@ -6489,14 +6490,15 @@ jack_nframes_t jack_time_to_frames(const jack_client_t *client, jack_time_t usec
get_frame_times(c, &times);
if (times.buffer_frames == 0)
if (times.sample_rate == 0 || times.rate_diff == 0.0)
return 0;
uint32_t nf = (uint32_t)times.frames;
uint64_t w = times.nsec/SPA_NSEC_PER_USEC;
uint64_t nw = times.next_nsec/SPA_NSEC_PER_USEC;
uint64_t dp = (uint64_t)(times.buffer_frames *
(float)SPA_USEC_PER_SEC / (times.sample_rate * times.rate_diff));
uint64_t w = nw - dp;
int64_t du = usecs - w;
int64_t dp = nw - w;
return nf + (int32_t)rint((double)du / (double)dp * times.buffer_frames);
}