[pulseaudio-discuss] [RFC] Alsa UCM integration.

Colin Guthrie gmane at colin.guthr.ie
Sat Feb 26 03:44:04 PST 2011

'Twas brillig, and Liam Girdwood at 25/02/11 16:27 did gyre and gimble:
> On Fri, 2011-02-25 at 10:10 -0600, pl bossart wrote:
>>> Modifiers can be used in the following situations:-
>>> 1) Music is being played. Pulseaudio has configured the Music use case
>>> verb via UCM. The system wants to play a tone, this could be a beep or
>>> even a ring tone for an incoming call. Pulseaudio would then check for a
>>> UCM "play tone" modifier for the current verb and then enable the
>>> modifier if it exists. This "play tone" modifier would setup the
>>> hardware to play both Music (i.e the verb) and additionally tones (the
>>> modifier). The modifier may use a different ALSA pcm and hardware volume
>>> controls to that of the main verb.
>>> If no "play tone" modifier exists then Pulsewould mix the tone into the
>>> music being played in software as it does atm.
>>> 2) Phone call is in progress. Pulseaudio has enabled the phone call UCM
>>> verb. The user wants to play music on the phone call. The modifier would
>>> be "Music" so Pulseaudio will check that a modifier exist for this when
>>> the phone call verb is active and enable this modifier.
>>> If no music modifier is available in the phone call verb configuration
>>> then pulseaudio would mix the music and voice in software.
>> Make sense.
>> But I am not sure the profiles as defined today in PulseAudio can work
>> with modifiers. What we discussed yesterday is that when a profile is
>> selected then you would set the UCM verb and know about all possible
>> sinks. We would need additional logic to have profile modifiers, or we
>> would need extra profiles to represent all possible combinations
>> (speech, speech+tone, speech+music, etc).
> Yeah, I'm thinking it may be easier to add the extra profiles here. We
> could match a profile and it's UCM verb+modifier at init time.

Could Card Profiles represent the verbs and the Sink Ports represent the



Colin Guthrie

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