[pulseaudio-discuss] dynamic routing through pulse audio

[Colin Guthrie]

'Twas brillig, and Himanshu Chug at 01/06/11 07:27 did gyre and gimble:
> Thanks for the quick reply Amanda, actually I need to understand this in
> some more details ,
> since I am new to pulseaudio please forgive if I ask something with not
> much sense
> 1. What this module do? and how PA modules can be loaded?

It more or less does as Amanda suggests. It corks/pauses the music
streams when a phone stream is active on the same sink.

In order to "cork" the application must handle cork requests from PA
(thus allowing the app to properly pause itself). Just in case the app
does not handle the cork, PA will mute the stream also. When the phone
stream disappears, the stream is unmuted and the uncork request is sent.
It's up to the music app to handle this gracefully.

Modules are loaded typically by the default.pa script that is processed
on startup. module-cork-music-on-phone is part of the default.pa we ship.

> 2. How and When the module "module-cork-music-on-phone"  comes to
> picture or gets loaded? What condition triggers to load this module?

It's listens for new streams and when it find both two streams tagged
with phone and a music respectively, it will cork/pause the music one.

> 3. I am setting the role through music application.

Yeah, if you set it explicitly that's best but PA also tries to parse
the .desktop file shipped with apps to try and augment the properties if
possible. This is why, e.g. we know that lastfm-player (which uses alsa)
is a "Music" app.

HTHs

Col



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Colin Guthrie
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http://colin.guthr.ie/

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