[alsa-devel] safe support for rewind in ALSA
mznyfn at 0pointer.de
Sun Feb 21 21:35:01 CET 2010
On Sun, 21.02.10 12:35, Kai Vehmanen (kvehmanen at eca.cx) wrote:
> But you can query the SNDRV_PCM_INFO_BATCH flag (it's set by e.g. the USB
> driver) and adjust your hrtimer-based application's logic based on that
> (if set, assume hw_ptr will jump in bursts). I know, not really ideal (you
> essentially have to e.g. disable PA glitch-free for these cards
> > This mean that the wake up time cannot be calculated using as number of
> > sample/rate since the fuction is not linear especially when using max buffer
> > size , min period --> max period size is much greater than the watermark
> Yep, that's what SNDRV_PCM_INFO_BATCH flag warns you about.
Hmm, could you elaborate a little about SNDRV_PCM_INFO_BATCH? What
exactly does that mean in general and especially for the timer based
I am currently not making use of this, but should I?
I cannot find much documentation about this, can you enlighten me?
I assume this is exposed to userspace via
Lennart Poettering Red Hat, Inc.
lennart [at] poettering [dot] net
http://0pointer.net/lennart/ GnuPG 0x1A015CC4
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