[pulseaudio-discuss] [alsa-devel] SNDRV_PCM_INFO_BATCH

Clemens Ladisch clemens at ladisch.de
Tue Mar 4 06:50:04 PST 2014

David Henningsson wrote:
> So, PulseAudio removed timer scheduling for drivers with
> SNDRV_PCM_INFO_BATCH, and released 5.0. Meanwhile, USB drivers still
> have SNDRV_PCM_INFO_BATCH, so this leads to performance regressions for
> USB sound cards.
> The question remains - what does SNDRV_PCM_INFO_BATCH really mean?

For your purposes, it means that the pointer accuracy is likely to be
worse than that of other sound cards.

There should be a mechanism to report the actual granularity.


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