Hello all,
I am attempting to write some ALSA use case configuration for a device
using a TAS6424 audio amplifier.
The Linux driver for this amplifier exposes a dual-channel PCM sink.
There are four physical output channels - two for each input channel.
Each output channel's volume can be set with a dedicated ALSA mixer control:
- TAS6424 Speaker Driver CH1 Playback Volume
- TAS6424 Speaker Driver CH2 Playback Volume
- TAS6424 Speaker Driver CH3 Playback Volume
- TAS6424 Speaker Driver CH4 Playback Volume
How can I tell ALSA UCM to set all of these channels when changing the
volume? As far as I can tell, I can only set a single PlaybackVolume
channel.
At a minimum, I need to set all the channel volumes together.
If I can also set each individually by describing which logical stereo
channels map to which output channels, that would be a nice bonus.
This is what I have so far, acting on CH2 alone:
SectionDevice."Speaker" {
Comment "Speakers"
Value {
PlaybackPCM "hw:''${CardId},0"
PlaybackRate 48000
PlaybackChannels 2
PlaybackVolume "TAS6424 Speaker Driver CH2 Playback Volume"
}
}
Thanks,
Josh
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