[alsa-devel] dsp after dmix

[Clemens Ladisch]

Michael Trimarchi wrote:
> On Mon, Oct 14, 2013 at 2:15 PM, Clemens Ladisch <clemens at ladisch.de> wrote:
>> Michael Trimarchi wrote:
>>> On Mon, Oct 14, 2013 at 9:08 AM, Clemens Ladisch <clemens at ladisch.de> wrote:
>>>> Michael Trimarchi wrote:
>>>>> My problem is to apply filtering after dmix plugin.
>>>>
>>>> The dmix plugin works only on top of a "hw" device.
>>>
>>> Yes I have seen the code. Is there anyway to work with dps without passing
>>> thought pulseaudio?
>>
>> You would have to write an ALSA kernel driver for the DSP device.
>
> This is not a good approach of the general problem because a lot of dsp has userspace
> support and firmware and initialization is done by userspace library. Can I change
> the writei and readi of the dmix plugin and let use my dsp function?

Yes, it would be possible to replace the dmix plugin with your dsp-mix
plugin.


Regards,
Clemens