#782: loud "woof" when closing a player
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Reporter: patra...@gmail.com | Owner: lennart
Type: defect | Status: new
Milestone: | Component: daemon
Keywords: |
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To reproduce:
0) disable event sounds
1) install decibel-audio-player
2) start it with the --playbin2 argument, play some music from a CD
3) notice that it is too loud, use the built-in volume control slider to
change volume
4) use mouse wheel on gnome-volume-control to change volume again
This stupid sequence of actions creates a situation when the device volume
is not the same as the stream volume. Yes, I know that decibel-audio-
player should not use the internal volume control.
5) Close decibel-audio-player while it is playing.
Actual result: loud "woof"
Expected result: playback stops without any audible transition effects
I suppose that this happens because with flat volumes, pulseaudio adjusts
ALSA mixer elements each time a stream begins or ends, and this races with
PCM playback. I.e., if the hardware volume is adjusted by pulseaudio
before the stream actually ends, the above-mentioned "woof" is emitted.
I think that this defect is not fixable if the device volume is affected
only by currently-playing stream volumes. Any of the following actions
will fix the problem:
* disable flat volumes (BTW - is this configuration supported and
supposed to work in the future?)
* take volumes of the past streams into account in the flat-volume logic
(so that end of stream doesn't lead to hardware volume change - but this
also needs some means to display and/or forget past stream volumes)
A gradual volume change will somewhat mask this "woof".
--
Ticket URL: <http://pulseaudio.org/ticket/782>
PulseAudio <http://pulseaudio.org/>
The PulseAudio Sound Server
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