From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Gabriel M. Beddingfield" <gabrbedd@gmail.com>
Subject: Re: Using UCM with PulseAudio
Date: Wed, 20 Jun 2012 21:50:02 -0500
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To: Arun Raghavan <arun.raghavan@collabora.co.uk>
Cc: alsa-devel@alsa-project.org, broonie@opensource.wolfsonmicro.com, Feng Wei <feng.wei@linaro.org>, Liam Girdwood <lrg@ti.com>, pulseaudio-discuss@lists.freedesktop.org
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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.

-gabriel