Allow higher sample rates to have more jitter than lower ones.
PR: 208791 MFC after: 3 days
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=308461
@ -2079,6 +2079,8 @@ uaudio_chan_play_sync_callback(struct usb_xfer *xfer, usb_error_t error)
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* recording channel:
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*/
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if (ch->priv_sc->sc_rec_chan.num_alt == 0) {
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int32_t jitter_max = howmany(sample_rate, 16000);
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/*
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* Range check the jitter values to avoid
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* bogus sample rate adjustments. The expected
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@ -2087,12 +2089,11 @@ uaudio_chan_play_sync_callback(struct usb_xfer *xfer, usb_error_t error)
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* mandates this requirement. Refer to chapter
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* 5.12.4.2 about feedback.
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*/
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if (temp > sample_rate)
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ch->jitter_curr = 1;
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else if (temp < sample_rate)
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ch->jitter_curr = -1;
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else
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ch->jitter_curr = 0;
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ch->jitter_curr = temp - sample_rate;
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if (ch->jitter_curr > jitter_max)
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ch->jitter_curr = jitter_max;
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else if (ch->jitter_curr < -jitter_max)
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ch->jitter_curr = -jitter_max;
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}
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ch->feedback_rate = temp;
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break;
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