Bug 88266

Summary:	Single channel audio is really loud
Product:	PulseAudio	Reporter:	Yuxuan Shui <yshuiv7>
Component:	core	Assignee:	pulseaudio-bugs
Status:	RESOLVED MOVED	QA Contact:	pulseaudio-bugs
Severity:	normal
Priority:	medium	CC:	lennart
Version:	unspecified
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description Yuxuan Shui 2015-01-10 13:09:41 UTC

When playing single channel audios, the resulting sound is way louder than playing dual channel audio with same volume settings.

If I convert the audio to dual channel before sending to pulseaudio, the result is normal.

If I create a channel map to map the channel to front left or front right, although this result in sound only play on one side (as expected), but the volume is correct.

Comment 1 Yuxuan Shui 2015-01-10 13:10:32 UTC

What I said previously is wrong, even if I map the channel to front left/right, the result sound is still very very loud.

Comment 2 Yuxuan Shui 2015-01-10 14:54:40 UTC

I did some extra tests:

1) This bug only occurs when volume != 100%

So if I set volume to 100% (0.00 dB), everything's fine. If I turn the volume slightly lower or higher, the sound will get extremely loud. If I turn the volume all the way down to ~3% (~-100 dB), the sound will become acceptable again.

2) This bug doesn't happen with float point sample format.

I tested mpd (which uses s16le), and opera/chromium (s16le). All of them have this problem. But firefox (float32le) is fine.

Comment 3 Yuxuan Shui 2015-01-10 15:37:29 UTC

OK, I downgraded my orc from 0.4.23 to 0.4.22, which solves the problem.

Guess I'll have to report this to orc then.

Comment 4 David Henningsson 2015-01-12 07:59:36 UTC

Maybe related? https://bugzilla.gnome.org/show_bug.cgi?id=742271
http://lists.freedesktop.org/archives/pulseaudio-discuss/2015-January/022905.html

Comment 5 Arun Raghavan 2015-01-12 08:24:33 UTC

Does this patch fix the problem for you?

http://lists.freedesktop.org/archives/pulseaudio-discuss/2015-January/022905.html

Comment 6 Yuxuan Shui 2015-01-13 07:59:48 UTC

(In reply to Arun Raghavan from comment #5)
> Does this patch fix the problem for you?
> 
> http://lists.freedesktop.org/archives/pulseaudio-discuss/2015-January/022905.
> html

Yes, thanks

Comment 7 GitLab Migration User 2018-07-30 10:23:58 UTC

-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been closed from further activity.

You can subscribe and participate further through the new bug through this link to our GitLab instance: https://gitlab.freedesktop.org/pulseaudio/pulseaudio/issues/395.

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