[pulseaudio-discuss] Sink for event sounds? WAS: paplay - sound roles?

[Colin Guthrie]

'Twas brillig, and Lennart Poettering at 05/01/10 15:05 did gyre and gimble:
> On Tue, 05.01.10 10:06, Colin Guthrie (gmane at colin.guthr.ie) wrote:
> 
>>> BTW, if you touch this code anyway it might be an idea to create a new
>>> tab which lists more role-specific sliders/dropdowns than just
>>> "event". I.e. a music slider, a telephony sleider and so on.
>>
>> Actually I'm a bit aprehensive about exposing other roles just yet...
>>
>> My reasoning:
>>
>> At present pavucontrol:
>>  1) Shows an Event slider for all sounds with the "event" role.
>>  2) Hides individual streams with the "event" role.
>>
>> This means that there is only one way to adjust the volume of these
>> streams and that is via the stream restore db and the widget.
>>
>> Now the stream restore key format currently has a priority scheme. If a
>> stream that has a role has a role-based rule, it will take precedence
>> over an application based stream (IIRC it's role, app id, app name,
>> media name in that order).
> 
> That is true.
> 
>> So if I were to expose the other roles, and someone set a volume for
>> e.g. music, then went along and started playing multiple files in e.g.
>> rhythmbox, found it too loud and adjusted the *application* stream for
>> rhythmbox it would be adjusted for that stream and saved to the db as an
>> application specific rule, but the next time rhythmbox played anything
>> (e.g. on track change), the volume would be restored from the *role*
>> based rule.
> 
> No. That's not how it works: changing the application volume will
> influence the role volume. 
> 
> For each stream when it first appears we calculate the key to identify
> it with in the database, both when reading and when writing, and we
> never use anything different during the stream's entire lifetime. That
> means that if for a rhythmbox stream we determine the
> sink-input-by-role:music key then we will read the volume/device with
> is it, and write it too. We will never fiddle with
> sink-input-by-application:Rhythmbox if they role is set.

Ahhhh, good point.

Col

-- 

Colin Guthrie
gmane(at)colin.guthr.ie
http://colin.guthr.ie/

Day Job:
  Tribalogic Limited [http://www.tribalogic.net/]
Open Source:
  Mandriva Linux Contributor [http://www.mandriva.com/]
  PulseAudio Hacker [http://www.pulseaudio.org/]
  Trac Hacker [http://trac.edgewall.org/]