Re: [alsa-devel] how to update hw_ptr and appl_ptr

26 Jun 2012


      I recently write squ driver and when DMA handler called snd_pcm_period_elapsed, so I want to know how about update hw_ptr in ALSA.
--
Best Regards,
Zhen Fu
-----Original Message-----
From: Clemens Ladisch [mailto:clemens@ladisch.de] 
Sent: Tuesday, June 26, 2012 5:35 PM
To: Zhen Fu
Cc: alsa-devel@alsa-project.org
Subject: Re: [alsa-devel] how to update hw_ptr and appl_ptr
Zhen Fu wrote:
...
I recently look the function snd_pcm_update_hw_ptr0 want to  find how
to update status->hw_ptr and control->appl_ptr.
status->hw_ptr is updated by snd_pcm_update_hw_ptr0.  control->appl_ptr
is updated by snd_pcm_lib_write1.
Why are you asking?
Regards,
Clemens