From 576b60a942dadb00eb99ddcb02ac3df2176f359d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=A9bastien=20Blin?=
<sebastien.blin@savoirfairelinux.com>
Date: Wed, 25 Jan 2023 11:11:18 -0500
Subject: [PATCH] pulseaudio: avoid to change volumes previously set
Because PulseAudio got flat-volumes on by default, getting an
echo-cancelled stream will, without option, set the master and
echo-cancelled volume to 33%.
This will make the user adjust their microphone every time.
Moreover, the module seems to re-adjust automatically the volume
with some gain control options.
So, in this patch, we load the echo-cancel without volume sharing
and with options to avoid to change a volume previously set.
Sources:
https://wiki.archlinux.org/title/PulseAudio/Troubleshooting
https://askubuntu.com/questions/1015327/disable-volume-auto-adjust-in-pulseaudio-module-echo-cancel
https://askubuntu.com/questions/279407/how-to-disable-microphone-from-auto-adjusting-its-input-volume
Change-Id: I981d1fedf7424895e6f44e9906e385f9c21bddee
---
src/media/audio/pulseaudio/audiostream.cpp | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/src/media/audio/pulseaudio/audiostream.cpp b/src/media/audio/pulseaudio/audiostream.cpp
index 1dca00a16b..dad3148915 100644
--- a/src/media/audio/pulseaudio/audiostream.cpp
+++ b/src/media/audio/pulseaudio/audiostream.cpp
@@ -59,6 +59,15 @@ AudioStream::AudioStream(pa_context* c,
std::unique_ptr<pa_proplist, decltype(pa_proplist_free)&> pl(pa_proplist_new(),
pa_proplist_free);
pa_proplist_sets(pl.get(), PA_PROP_FILTER_WANT, "echo-cancel");
+ pa_proplist_sets(
+ pl.get(), "filter.apply.echo-cancel.parameters", // needs pulseaudio >= 11.0
+ "use_volume_sharing=0" // share volume with master sink/source
+ " use_master_format=1" // use format/rate/channels from master sink/source
+ " aec_args=\""
+ "digital_gain_control=1"
+ " analog_gain_control=0"
+ " experimental_agc=1"
+ "\"");
audiostream_ = pa_stream_new_with_proplist(c,
desc,
--
GitLab