Merge tag 'android-6.0.1_r30' into HEAD

Ticket: RM-234
Android 6.0.1 release 30

Change-Id: I1bd7cf4081a12d28dc5da8b53b9124180afaa23d

1 files changed, 23 insertions, 2 deletions

diff --git a/services/core/java/com/android/server/audio/AudioService.java b/services/core/java/com/android/server/audio/AudioService.java
index b3b328a..ef2ff62 100644
--- a/services/core/java/com/android/server/audio/AudioService.java
+++ b/services/core/java/com/android/server/audio/AudioService.java
@@ -4003,8 +4003,29 @@ public class AudioService extends IAudioService.Stub {
             int index;
             if (mIsMuted) {
                 index = 0;
-            } else if (((device & AudioSystem.DEVICE_OUT_ALL_A2DP) != 0 && mAvrcpAbsVolSupported)
-                    || ((device & mFullVolumeDevices) != 0)) {
+            } else if ((device & AudioSystem.DEVICE_OUT_ALL_A2DP) != 0 && mAvrcpAbsVolSupported) {
+                /* Special handling for Bluetooth Absolute Volume scenario
+                 * If we send full audio gain, some accessories are too loud even at its lowest
+                 * volume. We are not able to enumerate all such accessories, so here is the
+                 * workaround from phone side.
+                 * For the lowest volume steps 1 and 2, restrict audio gain to 50% and 75%.
+                 * For volume step 0, set audio gain to 0 as some accessories won't mute on their end.
+                 */
+                int i = (getIndex(device) + 5)/10;
+                if (i == 0) {
+                    // 0% for volume 0
+                    index = 0;
+                } else if (i == 1) {
+                    // 50% for volume 1
+                    index = (int)(mIndexMax * 0.5) /10;
+                } else if (i == 2) {
+                    // 75% for volume 2
+                    index = (int)(mIndexMax * 0.75) /10;
+                } else {
+                    // otherwise, full gain
+                    index = (mIndexMax + 5)/10;
+                }
+            } else if ((device & mFullVolumeDevices) != 0) {
                 index = (mIndexMax + 5)/10;
             } else {
                 index = (getIndex(device) + 5)/10;