commit 86cb3bcd4fe8e79b0587175d007fc81989a156a4
author zhangjincheng <zhangjincheng@xiaomi.com> Mon Jan 16 17:17:38 2023 +0800
committer Eric Laurent <elaurent@google.com> Wed Mar 29 17:29:11 2023 +0000
tree 299a7340ce068aae8b6a6ddd5de76e4de5155103
parent 057dbb9a9c87ca7777e5ab33aca8f2a9d2108c40

disable audio balance in voip call for mono channel

When modifying "Audio balance" to Right, the mMasterBalanceLeft
will be set to 0.0.  The action will cause no sound on earpiece
in voip calls.

For mono sound, we think the master audio balance should be disabled
when voip for earpiece.

Test: make
Bug: 275733423
Change-Id: I1ae010d7cd352bf7a9be251775d62c78fc15e1b0
Signed-off-by: zhangjincheng <zhangjincheng@xiaomi.com>

services/audioflinger/Threads.cpp

diff --git a/services/audioflinger/Threads.cpp b/services/audioflinger/Threads.cpp
index 661550a..d9fdc3e 100644
--- a/services/audioflinger/Threads.cpp
+++ b/services/audioflinger/Threads.cpp
@@ -6486,9 +6486,13 @@
         if (right > GAIN_FLOAT_UNITY) {
             right = GAIN_FLOAT_UNITY;
         }
-
-        left *= v * mMasterBalanceLeft; // DirectOutputThread balance applied as track volume
-        right *= v * mMasterBalanceRight;
+        left *= v;
+        right *= v;
+        if (mAudioFlinger->getMode() != AUDIO_MODE_IN_COMMUNICATION
+                || audio_channel_count_from_out_mask(mChannelMask) > 1) {
+            left *= mMasterBalanceLeft; // DirectOutputThread balance applied as track volume
+            right *= mMasterBalanceRight;
+        }
     }
 
     track->processMuteEvent_l(mAudioFlinger->getOrCreateAudioManager(),