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From ffe6a4f4b6f56296165cea8651f35563d168ac89 Mon Sep 17 00:00:00 2001
From: Quinten Kock <quintenkock@gmail.com>
Date: Wed, 21 Jun 2023 20:51:11 +0200
Subject: [PATCH] Make setGenericVolume keep balance between channels
Previously setGenericVolume would apply the same amount of difference
on all channels, making e.g. 100%/50% -> 80%/30%.
This commit changes it to keep the ratios equal instead, so that the
resulting volume would be 80%/40%, keeping the balance the same.
BUG: 435840
FIXED-IN: 5.27.7
(cherry picked from commit cfe4a360f2640d7bd4e2d936804b100a299b268a)
---
src/context.h | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/src/context.h b/src/context.h
index 3d1f7525..969fa13b 100644
--- a/src/context.h
+++ b/src/context.h
@@ -123,9 +123,12 @@ public:
newVolume = qBound<qint64>(0, newVolume, PA_VOLUME_MAX);
pa_cvolume newCVolume = cVolume;
if (channel == -1) { // -1 all channels
- const qint64 diff = newVolume - pa_cvolume_max(&cVolume);
+ const qint64 orig = pa_cvolume_max(&cVolume);
+ const qint64 diff = newVolume - orig;
for (int i = 0; i < newCVolume.channels; ++i) {
- newCVolume.values[i] = qBound<qint64>(0, newCVolume.values[i] + diff, PA_VOLUME_MAX);
+ const qint64 channel = newCVolume.values[i];
+ const qint64 channelDiff = orig == 0 ? diff : diff * channel / orig;
+ newCVolume.values[i] = qBound<qint64>(0, newCVolume.values[i] + channelDiff, PA_VOLUME_MAX);
}
} else {
Q_ASSERT(newCVolume.channels > channel);
--
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