Selon Clemens Ladisch <[EMAIL PROTECTED]>:

> Mathieu Rondonneau wrote:
> > I don't understand why count is 1024 ?
> > why count is not equal to runtime->period_size (i.e. 16*1024)?
> 
> If your frame size is 4, this is the size of a memory page.  I guess
> ALSA wants to copy the data one page at a time, and this is required
> if the buffer isn't contiguous.


How do i know the frame size?
Is it the runtime->frame_bits value?
the frame_bits is 16.

I'm using snd_pcm_lib_preallocate_pages_for_all api for memory space allocation.
Does it mean the buffer isn't contiguous?

Thank you for your help.

Mathieu






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