Author: hselasky
Date: Wed Nov 9 07:09:27 2016
New Revision: 308461
URL: https://svnweb.freebsd.org/changeset/base/308461
Log:
Allow higher sample rates to have more jitter than lower ones.
PR: 208791
MFC after: 3 days
Modified:
head/sys/dev/sound/usb/uaudio.c
Modified: head/sys/dev/sound/usb/uaudio.c
==============================================================================
--- head/sys/dev/sound/usb/uaudio.c Wed Nov 9 06:47:29 2016
(r308460)
+++ head/sys/dev/sound/usb/uaudio.c Wed Nov 9 07:09:27 2016
(r308461)
@@ -2079,6 +2079,8 @@ uaudio_chan_play_sync_callback(struct us
* recording channel:
*/
if (ch->priv_sc->sc_rec_chan.num_alt == 0) {
+ int32_t jitter_max = howmany(sample_rate, 16000);
+
/*
* Range check the jitter values to avoid
* bogus sample rate adjustments. The expected
@@ -2087,12 +2089,11 @@ uaudio_chan_play_sync_callback(struct us
* mandates this requirement. Refer to chapter
* 5.12.4.2 about feedback.
*/
- if (temp > sample_rate)
- ch->jitter_curr = 1;
- else if (temp < sample_rate)
- ch->jitter_curr = -1;
- else
- ch->jitter_curr = 0;
+ ch->jitter_curr = temp - sample_rate;
+ if (ch->jitter_curr > jitter_max)
+ ch->jitter_curr = jitter_max;
+ else if (ch->jitter_curr < -jitter_max)
+ ch->jitter_curr = -jitter_max;
}
ch->feedback_rate = temp;
break;
_______________________________________________
svn-src-head@freebsd.org mailing list
https://lists.freebsd.org/mailman/listinfo/svn-src-head
To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
