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Use Alsa & Tinyalsa plugins to parameterize HW Codec

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freno edited this page Mar 24, 2014 · 2 revisions

About alsa mixer controls

Codec vendors expose the available parameters of their HW through alsa mixer control interface. These controls can be listed using the amixer utility:

$amixer –c <card_number> controls

Output:

numid=8,iface=MIXER,name='Headphone Playback Switch'
numid=43,iface=MIXER,name='Headphone Playback Volume'
...
numid=41,iface=MIXER,name='Lineout Mux'`
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