Re: [alsa-devel] ALSA buffer query

On Thu, 11 Nov 2010, Irfan Shaikh wrote:

Hello All,

 1) My understanding :  snd_pcm_writei() takes the allocated buffer 

from applications and passes the buffer beneath to the ASLA library and then to the ALSA driver for rendering Audio.

 2) Query 1 : Instead of me allocating the buffer in ALSA 

application and passing the pointer in snd_pcm_writei, Can ALSA allocate the buffer and give to my application, so that i can copy my data into it.

 3) Query 2 : Is there any wayto diirectly get hardware ALSA buffer 

from the ALSA driver to application so that i can copy PCM data to this buffer directly. If not, is there any way can we do this ?

Read alsa-lib documentation. snd_pcm_mmap_begin/snd_pcm_mmap_commit.

Jaroslav

----- Jaroslav Kysela perex@perex.cz Linux Kernel Sound Maintainer ALSA Project, Red Hat, Inc.