[alsa-devel] Have multiple opens removed on one device?

Mark Brown broonie at opensource.wolfsonmicro.com
Mon Aug 22 13:21:43 CEST 2011

On Mon, Aug 22, 2011 at 12:15:58PM +0200, Takashi Iwai wrote:
> Scott Jiang wrote:

> > In kernel 2.6.34 I can use aplay to play audio at the same time, alsa
> > will mix the audio.

> No, kernel part doesn't do such a thing.  If it's mixed, it must be
> in the user-space (either dmix or a daemon like pulseaudio), unless
> you hardware can do mixing by itself.

There *are* some cards (mostly older ones like emu10k) that support
multiple streams transparently but this has never been supported in
ASoC due a lack of hardware that can do it.

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