[alsa-devel] SoC multiple streams

[Lee Revell]

On 6/27/07, Steve Longerbeam <stevel at embeddedalley.com> wrote:
> It's looking like the way to implement per-substream controls is to add
> the controls for all possible substreams, and then somehow determine
> which substream is being referred to in the get/put callbacks, and then
> get/put the control for only that substream. Is this the way
> per-substream controls should be done?
>
> Also, with 64 substreams and multiple controls for each, we're talking
> about adding hundreds of controls, can ALSA handle this? I can imagine
> alsamixer looking quite crowded :-/

Please check the ALSA emu10k1 driver for a sample implementation.  32
substreams, hardware mixing with independent HW volume control for
each.

Lee