desktop-packages team mailing list archive

[Matthew Paul Thomas <mpt@xxxxxxxxxxxxx>]

It seems as if there aren't two problems here after all ... There are
three.

First, if you are quick enough to change the volume while a sound effect
is playing, you can see that it resets to the maximum the next time the
sound effect plays. That's bug 1418210.

Second, even if you don't do that, if headphones are connected, you
still get volume notifications from the output role changing. That makes
*this* bug much easier to notice (otherwise the only effect would be
that the hardware keys seemed like they didn't work), but it's
nonetheless separate, so I've reported it as bug 1484589.

And third, this bug, that the output role changes too briefly for you to
change its volume.

Maroon in Trouble uses the Qt SoundEffect API. <http://doc.qt.io/qt-5
/qtquick-demos-maroon-example.html>

Qt says that "SoundEffect provides a way to play short sound effects,
like in video games ... You should use Audio for music playback."
<http://doc.qt.io/qt-5/qml-multimedia.html#soundeffect>

Apparently SoundEffect is using the "multimedia" role, which is not the
"alert" default, which causes a temporary role switch.

So, the way to fix this bug following the current design would be to
change SoundEffect in Qt to use the default "alert" role, while Audio
continues using the "multimedia" role.

Alternatively, we could change the volume controls to control not simply
the active output role, but something like "the active output role
unless it was changed less than 5 seconds ago, in which case the
previous output role". But I think just fixing SoundEffect would be
simpler.

** Summary changed:

- Apps change system volume all the time
+ Apps change audio output role all the time

-- 
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Packages, which is subscribed to pulseaudio in Ubuntu.
https://bugs.launchpad.net/bugs/1478506

Title:
  Apps change audio output role all the time

Status in Canonical System Image:
  Confirmed
Status in indicator-sound package in Ubuntu:
  Confirmed
Status in pulseaudio package in Ubuntu:
  Confirmed

Bug description:
  To reproduce, install the app "Maroon in trouble" from the app store
  and play it a little with having sound enabled. Press the volume down
  hardware button on the phone. It will temporarily decrease the volume.
  However, whenever a new item comes into the scene, it will be on 100%
  volume again.

  Setting the system volume to 0 should keep everything at 0.

  
  Please note that this app does *not* have any code to set the volume! Also this app is one of the upstream Qt QML example demo apps, so this is really how QML apps are supposed to work (in other words, it is not a badly implemented app, but really an issue in the system)

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