[alsa-devel] Question on buffer size setting
tiwai at suse.de
Mon May 21 17:51:42 CEST 2007
At Fri, 18 May 2007 18:00:18 -0700,
Allyn, Mark A wrote:
> I am attempting to do some debugging of a new audio device, and I need
> to change the
> number of buffer descriptor list entries from the default of 16 to
> something much
> smaller, like 3.
If you're referring to hda-intel, the number of buffer descriptor list
isn't fixed there. The smallest size is 2 and the max size is 16.
(16 is used for allocation at the driver init time, though.)
> I am a bit confused while looking at the code. There seems to be a value
> SNDRV_PCM_HW_PARAM_BUFFER_SIZE, but I can't figure how it is set. Is
> this a parameter that
> is passed as part of the configure prior to doing a make for the driver?
> Is this a parameter
> passed to modprobe when loading the driver?
It's a parameter set by user-space at each time the application sets
up the PCM after opening the device. The setup is done in hw_params
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