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

2010/3/25 Candelaria Villarreal, Jorge jorge.candelaria@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 ?