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.
