11 Nov
2010
11 Nov
'10
8:18 a.m.
On Thu, 11 Nov 2010, Irfan Shaikh wrote:
Hello All,
1) My understanding : snd_pcm_writei() takes the allocated bufferfrom 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 ALSAapplication 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 bufferfrom 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.