[alsa-devel] ALSA DMIX support without MMAP ?
Hi,
I am working on android and and in our device we use ALSA.
I have enabled dmix support for andoid as by default android doesn't have this plugin enabled and soon will post it in android forum however i have run into some problems.Hoping takashi can help me out on this.
Problem is when i am trying to use dmix plugin i am not getting any sound (logs shown below).Is it because i don't have mmap mode support on my device???
If yes then can't dmix work without mmap mode??? Logs shown below:
Entered s3c24xx_pcm_hw_params, Entered s3c24xx_pcm_hw_params, line 330 Entered s3c24xx_pcm_mmap Entered s3c24xx_pcm_prepare Entered s3c24xx_pcm_enqueue Entered s3c24xx_pcm_trigger Entered s3c24xx_pcm_pointer Entered s3c24xx_pcm_pointer res_value[0] snd_pcm_update_hw_ptr_pos xun: [0]occured XRUN!
Normal playback and recording is fine if i dont use dmix plugin.During my normal playback and recording i don't use mmap as i preallocate DMA memory and use them.
Regards, anish
On Wed, Jan 13, 2010 at 09:46:36AM +0000, ANISH KUMAR wrote:
Problem is when i am trying to use dmix plugin i am not getting any sound (logs shown below).Is it because i don't have mmap mode support on my device???
mmap is supported by the Samsung drivers.
If yes then can't dmix work without mmap mode??? Logs shown below:
Entered s3c24xx_pcm_hw_params, Entered s3c24xx_pcm_hw_params, line 330 Entered s3c24xx_pcm_mmap Entered s3c24xx_pcm_prepare Entered s3c24xx_pcm_enqueue Entered s3c24xx_pcm_trigger Entered s3c24xx_pcm_pointer Entered s3c24xx_pcm_pointer res_value[0] snd_pcm_update_hw_ptr_pos xun: [0]occured XRUN!
This looks like the dmix data rates are getting out of sync with what the hardware is doing. Enabling CONFIG_SND_PCM_XRUN_DEBUG will produce more diagnostic information from the driver side.
participants (2)
-
ANISH KUMAR -
Mark Brown