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latency: add timestamps to the POS lines

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- remove first capture pos line
- measure the snd_pcm_start() call, too

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2022-11-14 21:26:39 +01:00
parent 3e4aeba25b
commit a0836e2af1
1 changed files with 6 additions and 11 deletions
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17
test/latency.c
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@ -556,7 +556,7 @@ int main(int argc, char *argv[])
snd_pcm_t *phandle, *chandle;
char *buffer;
int err, latency, morehelp;
int ok, first_avail;
int ok;
snd_timestamp_t p_tstamp, c_tstamp;
ssize_t r, cap_avail, cap_avail_max, pbk_fill, pbk_fill_min;
size_t frames_in, frames_out, in_max;
@ -723,12 +723,14 @@ int main(int argc, char *argv[])
break;
}
if (realtime_check)
timestamp_now(&tstamp_start);
if ((err = snd_pcm_start(chandle)) < 0) {
printf("Go error: %s\n", snd_strerror(err));
exit(0);
}
if (realtime_check)
timestamp_now(&tstamp_start);
printf("[%lldus] Stream start\n", timestamp_diff_micro(&tstamp_start));
gettimestamp(phandle, &p_tstamp);
gettimestamp(chandle, &c_tstamp);
#if 0
@ -740,7 +742,6 @@ int main(int argc, char *argv[])
ok = 1;
in_max = 0;
first_avail = 1;
while (ok && frames_in < loop_limit) {
cap_avail = latency;
if (sys_latency > 0) {
@ -751,12 +752,6 @@ int main(int argc, char *argv[])
ok = 0;
break;
}
if (first_avail && realtime_check) {
long long diff = timestamp_diff_micro(&tstamp_start);
long long pos = frames_to_micro(cap_avail);
printf("POS FIRST CHECK: c=%zd (rt=%lldus)\n", cap_avail, pos - diff);
first_avail = 0;
}
} else if (use_poll) {
/* use poll to wait for next event */
snd_pcm_wait(chandle, 1000);
@ -775,8 +770,8 @@ int main(int argc, char *argv[])
long long diff = timestamp_diff_micro(&tstamp_start);
long long cap_pos = frames_to_micro(frames_in + cap_avail);
long long pbk_pos = frames_to_micro(frames_out - pbk_fill);
printf("POS: p=%zd (min=%zd, rt=%lldus) c=%zd (max=%zd, rt=%lldus)\n",
pbk_fill, pbk_fill_min, pbk_pos - diff,
printf("[%lldus] POS: p=%zd (min=%zd, rt=%lldus) c=%zd (max=%zd, rt=%lldus)\n",
diff, pbk_fill, pbk_fill_min, pbk_pos - diff,
cap_avail, cap_avail_max, cap_pos - diff);
} else if (pos_dump) {
printf("POS: p=%zd (min=%zd), c=%zd (max=%zd)\n",