Re: [PATCH v15 00/16] Add audio support in v4l2 framework
From: Jaroslav Kysela
Date: Mon May 06 2024 - 05:43:17 EST
On 06. 05. 24 10:49, Shengjiu Wang wrote:
Even now I still think V4L2 is the best option, but it looks like there
are a lot of rejects. If develop a new ALSA-mem2mem, it is also
a duplication of code (bigger duplication that just add audio support
in V4L2 I think).
Maybe not. Could you try to evaluate a pure dma-buf (drivers/dma-buf) solution
and add only enumeration and operation trigger mechanism to the ALSA API? It
seems that dma-buf has enough sufficient code to transfer data from and to the
kernel space for the further processing. I think that one buffer can be as
source and the second for the processed data.
We can eventually add new ioctls to the ALSA's control API (/dev/snd/control*)
for this purpose (DSP processing).
Jaroslav
--
Jaroslav Kysela <perex@xxxxxxxx>
Linux Sound Maintainer; ALSA Project; Red Hat, Inc.