[alsa-devel] Playing silence instead of pausing during underrun
perex at perex.cz
Thu Sep 4 17:28:38 CEST 2008
On Thu, 4 Sep 2008, Timur Tabi wrote:
> If I understand it correctly, when ALSA detects an underrun during
> playback, it throttles the driver by sending pause and resume commands.
> It turns out that our hardware doesn't really like this. We're looking
> at various solutions, but one proposal would be to keep the hardware
> running during a pause, but just have it play silence instead. That is,
> ALSA keeps feeding silence data during an underrun recovery.
> Is there an easy way to do this in ALSA? Is there another driver that
> does this?
Note that not all hardware supports pause, so just remove
SNDRV_PCM_INFO_PAUSE and all pause related code in the trigger callback
and let user space to do the full reinitialization.
Jaroslav Kysela <perex at perex.cz>
Linux Kernel Sound Maintainer
ALSA Project, Red Hat, Inc.
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