On Mon, Jul 03, 2023 at 02:07:10PM +0200, Takashi Iwai wrote: > Shengjiu Wang wrote: > > There is no such memory to memory interface defined in ALSA. Seems > > ALSA is not designed for M2M cases. > There is no restriction to implement memory-to-memory capture in ALSA > framework. It'd be a matter of the setup of PCM capture source, and > you can create a corresponding kcontrol element to switch the mode or > assign a dedicated PCM substream, for example. It's just that there > was little demand for that. Yeah, it's not a terrible idea. We might use it more if we ever get better support for DSP audio, routing between the DSP and external devices if driven from the CPU would be a memory to memory thing. > I'm not much against adding the audio capture feature to V4L2, > though, if it really makes sense. But creating a crafted /dev/audio* > doesn't look like a great idea to me, at least. I've still not looked at the code at all.
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