[alsa-devel] Problem adding support for digital mixer in codec

[Raymond Yau]

2010/3/25 Candelaria Villarreal, Jorge <jorge.candelaria at ti.com>

> Hi,
>
> I am trying to add support for a digital mixer. The digital mixer is
> connected like the following example:
>
>
> Path 1 -------\
> Path 2 --------\
>                    MIXER ------> DAC----> ...
> Path 3 --------/
> Path 4 -------/
>
>
>
> However, I think ALSA does not support this configuration, as the DAC
> should be the first element in a route. I tried adding the DAC to the
> route first, and connected its output to the mixer inputs, like this:
>
>          {"Mixer", "Multimedia Ext Switch", "HSDAC Left"},
>        {"Mixer", "Multimedia Ext Switch", "HSDAC Right"},
>
>        {"Mixer", "Voice Switch", "HSDAC Left"},
>        {"Mixer", "Voice Switch", "HSDAC Right"},
>
>        {"Mixer", "Multimedia Uplink Switch", "HSDAC Left"},
>        {"Mixer", "Multimedia Uplink Switch", "HSDAC Right"},
>
>        {"Mixer", "Multimedia Switch", "HSDAC Left"},
>        {"Mixer", "Multimedia Switch", "HSDAC Right"},
>
> But this does not seem to work. Can anyone give me some tips? Any comment
> would be appreciated.
>
> Thanks,
> Jorge
>


Does your DSP support hardware mixing ?