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mixer-control: set max_volume to PA_VOLUME_NORM if no valid volume

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Reproducers:
1. After a fresh install of Ubuntu 20.04, open a gnome-terminal
and press the Tab key, the system will output a bell notification
sound. Open gnome-control-center and check the sound page,
the output volume of 'System Sounds' is at 0, but the notification
sound is still output at max volume.

2. After a fresh install of Ubuntu 20.04, open gnome-control-center
directly, change to the sound page, the output volume of
'System Sounds' is at its max level. Click any 'Alert Sound' button
at the bottom of the page, the sound is output at max volume but
the UI slider for the output volume of 'System Sounds' changes to 0.
The notification sound can however still could be heard at max volume.

After a fresh install of the system, there is no saved entry for
"sink-input-by-media-role:event" in PulseAudio's module-stream-restore,
so libgvc will create a pa_ext_stream_restore_info in the
_pa_ext_stream_restore_read_cb(). When a notification sound stream
is sent to PA, PA will create an entry with name of
"sink-input-by-media-role:event" and save it to the database, but
volume_valid is false until gnome calls pa_ext_stream_restore_write().

So if users open the gnome-control-center before
pa_ext_stream_restore_write() is called, although there is an entry
named "sink-input-by-media-role:event" in the module-stream-restore,
the volume is not valid in that entry, and calling
pa_cvolume_max (&info->volume) will returns 0.

In this case, libgvc reports the max_volume is 0, but in PulseAudio,
the stream/sink-input volume is max (pa_sink_input_new() of the
sink-input.c).

Check if info->volume.channels is 0, which would mean the volume is
not valid in the entry, and set max_volume to PA_VOLUME_NORM like
_pa_ext_stream_restore_read_cb() does in this case.

Below is the PA log about the stream entry without a valid volume:
E: [pulseaudio] module-stream-restore.c: name=sink-input-by-media-role:event
E: [pulseaudio] module-stream-restore.c: device=(null) no
E: [pulseaudio] module-stream-restore.c: channel_map=(invalid)
E: [pulseaudio] module-stream-restore.c: volume=(invalid) no
E: [pulseaudio] module-stream-restore.c: mute=no no
This commit is contained in:
Hui Wang 2021-08-23 14:06:20 +08:00 committed by Bastien Nocera
parent 000046e887
commit dbfbacc957
1 changed files with 7 additions and 1 deletions
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6
gvc-mixer-control.c
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@ -2871,6 +2871,12 @@ update_event_role_stream (GvcMixerControl *control,
GUINT_TO_POINTER (control->priv->event_sink_input_id));
}
/* 0 channels here means there is no valid volume in
* pa_ext_stream_restore_info() and in the saved stream entry of
* module-stream-restore in PulseAudio. */
if (info->volume.channels == 0)
max_volume = PA_VOLUME_NORM;
else
max_volume = pa_cvolume_max (&info->volume);
gvc_mixer_stream_set_name (stream, _("System Sounds"));