commit b9051ca66ab52ec34e200e37d45f5d23147512a7
author Treehugger Robot <treehugger-gerrit@google.com> Wed Jul 11 02:21:59 2018 +0000
committer Gerrit Code Review <noreply-gerritcodereview@google.com> Wed Jul 11 02:21:59 2018 +0000
tree 8ffdeb02108081c5998eab9f9e71b8bd6fcd2fbd
parent ea3e91bcd78b9598bbf742e0c76b7de00955af3c
parent 075005f0ef8adf5397b9ed6210e0160f1a0314a5

Merge "Explicitly mute the audio output while switching the A2DP Active Device"

src/com/android/bluetooth/a2dp/A2dpService.java

diff --git a/src/com/android/bluetooth/a2dp/A2dpService.java b/src/com/android/bluetooth/a2dp/A2dpService.java
index 0641c9f..e883227 100644
--- a/src/com/android/bluetooth/a2dp/A2dpService.java
+++ b/src/com/android/bluetooth/a2dp/A2dpService.java
@@ -507,7 +507,14 @@
                 }
                 // Make sure the Audio Manager knows the previous Active device is disconnected,
                 // and the new Active device is connected.
+                // Also, mute and unmute the output during the switch to avoid audio glitches.
+                boolean wasMuted = false;
                 if (previousActiveDevice != null) {
+                    if (!mAudioManager.isStreamMute(AudioManager.STREAM_MUSIC)) {
+                        mAudioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC,
+                                                         AudioManager.ADJUST_MUTE, 0);
+                        wasMuted = true;
+                    }
                     mAudioManager.setBluetoothA2dpDeviceConnectionStateSuppressNoisyIntent(
                             previousActiveDevice, BluetoothProfile.STATE_DISCONNECTED,
                             BluetoothProfile.A2DP, true, -1);
@@ -529,6 +536,10 @@
                 // change, so the Audio Service can reset accordingly the audio
                 // feeding parameters in the Audio HAL to the Bluetooth stack.
                 mAudioManager.handleBluetoothA2dpDeviceConfigChange(mActiveDevice);
+                if (wasMuted) {
+                    mAudioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC,
+                                                     AudioManager.ADJUST_UNMUTE, 0);
+                }
             }
         }
         return true;