[alsa-devel] period_size and relation to number of samples
korbse at gmx.at
Thu Sep 6 16:30:17 CEST 2007
Takashi Iwai schrieb:
> At Thu, 06 Sep 2007 07:52:37 +0200,
> Markus Korber wrote:
>> Now, what is an application allowed to send and what not? For example,
>> could an application only send 1024 l/r samples and is the driver
>> responsible for buffering the data? Or must it obey the announced
>> period_size and *always* provide 2048 l/r samples?
> No, as mentioned, the app is free to send any size in general. When
> the period size is filled up, basically it's supposed to be playable.
> But, the procedure "fill the whole buffer then start" is the most
> robust way.
> The period size is the minimal chunk size that controls the poll
> frequency. So, it's natural to send in this size. It's no
> requirement but a common use case.
Thus, is it possible to buffer the data in ALSA before sending them to
the driver, in such a way, that the driver always receives period_size
samples, regardless of what the application sends to ALSA? And how
would I configure ALSA for such a setup?
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