[alsa-devel] Using UCM with PulseAudio

Gabriel M. Beddingfield gabrbedd at gmail.com
Thu Jun 21 04:50:02 CEST 2012

On 06/20/2012 07:30 AM, Arun Raghavan wrote:
>> UCM provides the "modifier" to allow ad-hoc modifications to the audio
>> use case like above where we want to play an end of call tone. In this
>> case the verb is still VoiceCall, but PA would enable the "PlayTone"
>> modifer to play the tone (UCM can also tell Pulseaudio the sink PCM and
>> volume control for the tone data).
> Just as an observation, I think the Android HAL just uses PCM 0 and not
> the PCM 3, but in the PA case, I'll do it the way you describe since
> that makes more sense.

Yes, the Galaxy Nexus pretty much only uses PCM 0 -- but that's mostly a 
reflection of AudioFlinger's design and limitations.


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