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Groups > linux.kernel > #1534014
| From | Clemens Ladisch <clemens@ladisch.de> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [alsa-devel] [PATCH 1/3 v1] ALSA: usb-audio: more tolerant packetsize |
| Date | 2016-12-01 13:20 +0100 |
| Message-ID | <sJyvf-3KW-5@gated-at.bofh.it> (permalink) |
| References | <sJ7Y6-3eC-3@gated-at.bofh.it> <sJ7Y6-3eC-1@gated-at.bofh.it> <sJuhY-PI-25@gated-at.bofh.it> <sJyvf-3KW-7@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Jiada Wang wrote: > On 11/30/2016 11:41 PM, Clemens Ladisch wrote: >> Jiada Wang wrote: >>> since commit 57e6dae1087bbaa6b33d3dd8a8e90b63888939a3 the expected packetsize is always limited to >>> nominal + 25%. It was discovered, that some devices >> >> Which devices? > > It was a LG nexus So it was the Android audio accessory mode. >>> have a much higher jitter in used packetsizes than 25% >> >> How high? > > the nominal packet size was somewhere around 176bytes > +25% would result in max expected packets to be ~220bytes > We observed some packets exceeding this size (256byte) 256 bytes per USB frame would correspond to 64 kHz, instead of the nominal 44.1 kHz. The audio accessory sample format is fixed, and that mode is no longer developed, so increasing the limit to +50% would be sufficient to work around this problem. I don't know if this is a bug in Google's generic AOA code, or if LG did some changes; I have not heard any other report so far ... Regards, Clemens
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[PATCH 1/3 v1] ALSA: usb-audio: more tolerant packetsize Jiada Wang <jiada_wang@mentor.com> - 2016-11-30 09:00 +0100
Re: [PATCH 1/3 v1] ALSA: usb-audio: more tolerant packetsize Takashi Iwai <tiwai@suse.de> - 2016-11-30 10:00 +0100
Re: [PATCH 1/3 v1] ALSA: usb-audio: more tolerant packetsize Jiada Wang <jiada_wang@mentor.com> - 2016-12-01 08:10 +0100
Re: [alsa-devel] [PATCH 1/3 v1] ALSA: usb-audio: more tolerant packetsize Clemens Ladisch <clemens@ladisch.de> - 2016-12-01 08:50 +0100
Re: [alsa-devel] [PATCH 1/3 v1] ALSA: usb-audio: more tolerant packetsize Takashi Iwai <tiwai@suse.de> - 2016-12-01 10:10 +0100
Re: [alsa-devel] [PATCH 1/3 v1] ALSA: usb-audio: more tolerant packetsize Clemens Ladisch <clemens@ladisch.de> - 2016-12-01 12:20 +0100
Re: [alsa-devel] [PATCH 1/3 v1] ALSA: usb-audio: more tolerant packetsize Takashi Iwai <tiwai@suse.de> - 2016-12-01 12:30 +0100
Re: [alsa-devel] [PATCH 1/3 v1] ALSA: usb-audio: more tolerant packetsize Clemens Ladisch <clemens@ladisch.de> - 2016-12-01 13:00 +0100
Re: [alsa-devel] [PATCH 1/3 v1] ALSA: usb-audio: more tolerant packetsize Clemens Ladisch <clemens@ladisch.de> - 2016-12-01 13:20 +0100
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