On Fri, 6 Sep 2002, Guilhem Tardy wrote:
> Hi all,
>
> While trying to understand snd_pcm_lib_write1(), I found that
> runtime->xfer_align is set to period_size in pcm_native.c, but wonder if it is
> just a default?
>
> Paul Davis' example (at http://www.op.net/~pbd/alsa-audio.html#playex) doesn't
> check for a particular transfer size, and my card supports playout of less than
> 160 samples (i.e. the period size). Thus, I set to try playing out 512 bytes at
> a time (i.e. 2048 samples of 2-bit ADPCM), which does NOT come to a multiple of
> period size. The result is that only 1920 samples are played, and my app thinks
> an error has occured.
>
> Is it a general requirement for apps to send only audio in multiple of the
> period size?
Nope, applications might modify xfer_align to satisfy their requirements.
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
SuSE Linux http://www.suse.com
ALSA project http://www.alsa-project.org
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