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DO NOT MERGE Bluetooth: Restrict gain for Absolute volume case

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For the lowest music volume steps 1 and 2, restrict the gain to 50% and
75%. This will avoid the lowest volume steps being too loud for some
accessories. For music volume 0, set phone gain to 0 as some
accessories won't mute on their end.

Change-Id: I24e0fa7be8c8635b428a11c91ea153aad7cec55f
Signed-off-by: Liejun Tao <baibai@motorola.com>
This commit is contained in:
Liejun Tao
2016-01-20 17:52:20 -06:00
committed by Andre Eisenbach
parent e210c99809
commit 9ef7634fa9
1 changed files with 23 additions and 2 deletions
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25
services/core/java/com/android/server/audio/AudioService.java
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@@ -3737,8 +3737,29 @@ 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;