1 files changed, 252 insertions, 0 deletions
diff --git a/java/com/android/dialer/app/voicemail/VoicemailAudioManager.java b/java/com/android/dialer/app/voicemail/VoicemailAudioManager.java
new file mode 100644
index 000000000..8d70cdbe7
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+++ b/java/com/android/dialer/app/voicemail/VoicemailAudioManager.java
@@ -0,0 +1,252 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.dialer.app.voicemail;
+
+import android.content.Context;
+import android.media.AudioDeviceInfo;
+import android.media.AudioManager;
+import android.media.AudioManager.OnAudioFocusChangeListener;
+import android.telecom.CallAudioState;
+import com.android.dialer.common.LogUtil;
+import java.util.concurrent.RejectedExecutionException;
+
+/** This class manages all audio changes for voicemail playback. */
+public final class VoicemailAudioManager
+    implements OnAudioFocusChangeListener, WiredHeadsetManager.Listener {
+
+  private static final String TAG = "VoicemailAudioManager";
+
+  public static final int PLAYBACK_STREAM = AudioManager.STREAM_VOICE_CALL;
+
+  private AudioManager mAudioManager;
+  private VoicemailPlaybackPresenter mVoicemailPlaybackPresenter;
+  private WiredHeadsetManager mWiredHeadsetManager;
+  private boolean mWasSpeakerOn;
+  private CallAudioState mCallAudioState;
+  private boolean mBluetoothScoEnabled;
+
+  public VoicemailAudioManager(
+      Context context, VoicemailPlaybackPresenter voicemailPlaybackPresenter) {
+    mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
+    mVoicemailPlaybackPresenter = voicemailPlaybackPresenter;
+    mWiredHeadsetManager = new WiredHeadsetManager(context);
+    mWiredHeadsetManager.setListener(this);
+
+    mCallAudioState = getInitialAudioState();
+    LogUtil.i(
+        "VoicemailAudioManager.VoicemailAudioManager", "Initial audioState = " + mCallAudioState);
+  }
+
+  public void requestAudioFocus() {
+    int result =
+        mAudioManager.requestAudioFocus(
+            this, PLAYBACK_STREAM, AudioManager.AUDIOFOCUS_GAIN_TRANSIENT);
+    if (result != AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
+      throw new RejectedExecutionException("Could not capture audio focus.");
+    }
+    updateBluetoothScoState(true);
+  }
+
+  public void abandonAudioFocus() {
+    updateBluetoothScoState(false);
+    mAudioManager.abandonAudioFocus(this);
+  }
+
+  @Override
+  public void onAudioFocusChange(int focusChange) {
+    LogUtil.d("VoicemailAudioManager.onAudioFocusChange", "focusChange=" + focusChange);
+    mVoicemailPlaybackPresenter.onAudioFocusChange(focusChange == AudioManager.AUDIOFOCUS_GAIN);
+  }
+
+  @Override
+  public void onWiredHeadsetPluggedInChanged(boolean oldIsPluggedIn, boolean newIsPluggedIn) {
+    LogUtil.i(
+        "VoicemailAudioManager.onWiredHeadsetPluggedInChanged",
+        "wired headset was plugged in changed: " + oldIsPluggedIn + " -> " + newIsPluggedIn);
+
+    if (oldIsPluggedIn == newIsPluggedIn) {
+      return;
+    }
+
+    int newRoute = mCallAudioState.getRoute(); // start out with existing route
+    if (newIsPluggedIn) {
+      newRoute = CallAudioState.ROUTE_WIRED_HEADSET;
+    } else {
+      if (mWasSpeakerOn) {
+        newRoute = CallAudioState.ROUTE_SPEAKER;
+      } else {
+        newRoute = CallAudioState.ROUTE_EARPIECE;
+      }
+    }
+
+    mVoicemailPlaybackPresenter.setSpeakerphoneOn(newRoute == CallAudioState.ROUTE_SPEAKER);
+
+    // We need to call this every time even if we do not change the route because the supported
+    // routes changed either to include or not include WIRED_HEADSET.
+    setSystemAudioState(
+        new CallAudioState(false /* muted */, newRoute, calculateSupportedRoutes()));
+  }
+
+  public void setSpeakerphoneOn(boolean on) {
+    setAudioRoute(on ? CallAudioState.ROUTE_SPEAKER : CallAudioState.ROUTE_WIRED_OR_EARPIECE);
+  }
+
+  public boolean isWiredHeadsetPluggedIn() {
+    return mWiredHeadsetManager.isPluggedIn();
+  }
+
+  public void registerReceivers() {
+    // Receivers is plural because we expect to add bluetooth support.
+    mWiredHeadsetManager.registerReceiver();
+  }
+
+  public void unregisterReceivers() {
+    mWiredHeadsetManager.unregisterReceiver();
+  }
+
+  /**
+   * Bluetooth SCO (Synchronous Connection-Oriented) is the "phone" bluetooth audio. The system will
+   * route to the bluetooth headset automatically if A2DP ("media") is available, but if the headset
+   * only supports SCO then dialer must route it manually.
+   */
+  private void updateBluetoothScoState(boolean hasAudioFocus) {
+    if (hasAudioFocus) {
+      if (hasMediaAudioCapability()) {
+        mBluetoothScoEnabled = false;
+      } else {
+        mBluetoothScoEnabled = true;
+        LogUtil.i(
+            "VoicemailAudioManager.updateBluetoothScoState",
+            "bluetooth device doesn't support media, using SCO instead");
+      }
+    } else {
+      mBluetoothScoEnabled = false;
+    }
+    applyBluetoothScoState();
+  }
+
+  private void applyBluetoothScoState() {
+    if (mBluetoothScoEnabled) {
+      mAudioManager.startBluetoothSco();
+      // The doc for startBluetoothSco() states it could take seconds to establish the SCO
+      // connection, so we should probably resume the playback after we've acquired SCO.
+      // In practice the delay is unnoticeable so this is ignored for simplicity.
+      mAudioManager.setBluetoothScoOn(true);
+    } else {
+      mAudioManager.setBluetoothScoOn(false);
+      mAudioManager.stopBluetoothSco();
+    }
+  }
+
+  private boolean hasMediaAudioCapability() {
+    for (AudioDeviceInfo info : mAudioManager.getDevices(AudioManager.GET_DEVICES_OUTPUTS)) {
+      if (info.getType() == AudioDeviceInfo.TYPE_BLUETOOTH_A2DP) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  /**
+   * Change the audio route, for example from earpiece to speakerphone.
+   *
+   * @param route The new audio route to use. See {@link CallAudioState}.
+   */
+  void setAudioRoute(int route) {
+    LogUtil.v(
+        "VoicemailAudioManager.setAudioRoute",
+        "route: " + CallAudioState.audioRouteToString(route));
+
+    // Change ROUTE_WIRED_OR_EARPIECE to a single entry.
+    int newRoute = selectWiredOrEarpiece(route, mCallAudioState.getSupportedRouteMask());
+
+    // If route is unsupported, do nothing.
+    if ((mCallAudioState.getSupportedRouteMask() | newRoute) == 0) {
+      LogUtil.w(
+          "VoicemailAudioManager.setAudioRoute",
+          "Asking to set to a route that is unsupported: " + newRoute);
+      return;
+    }
+
+    // Remember the new speaker state so it can be restored when the user plugs and unplugs
+    // a headset.
+    mWasSpeakerOn = newRoute == CallAudioState.ROUTE_SPEAKER;
+    setSystemAudioState(
+        new CallAudioState(false /* muted */, newRoute, mCallAudioState.getSupportedRouteMask()));
+  }
+
+  private CallAudioState getInitialAudioState() {
+    int supportedRouteMask = calculateSupportedRoutes();
+    int route = selectWiredOrEarpiece(CallAudioState.ROUTE_WIRED_OR_EARPIECE, supportedRouteMask);
+    return new CallAudioState(false /* muted */, route, supportedRouteMask);
+  }
+
+  private int calculateSupportedRoutes() {
+    int routeMask = CallAudioState.ROUTE_SPEAKER;
+    if (mWiredHeadsetManager.isPluggedIn()) {
+      routeMask |= CallAudioState.ROUTE_WIRED_HEADSET;
+    } else {
+      routeMask |= CallAudioState.ROUTE_EARPIECE;
+    }
+    return routeMask;
+  }
+
+  private int selectWiredOrEarpiece(int route, int supportedRouteMask) {
+    // Since they are mutually exclusive and one is ALWAYS valid, we allow a special input of
+    // ROUTE_WIRED_OR_EARPIECE so that callers don't have to make a call to check which is
+    // supported before calling setAudioRoute.
+    if (route == CallAudioState.ROUTE_WIRED_OR_EARPIECE) {
+      route = CallAudioState.ROUTE_WIRED_OR_EARPIECE & supportedRouteMask;
+      if (route == 0) {
+        LogUtil.e(
+            "VoicemailAudioManager.selectWiredOrEarpiece",
+            "One of wired headset or earpiece should always be valid.");
+        // assume earpiece in this case.
+        route = CallAudioState.ROUTE_EARPIECE;
+      }
+    }
+    return route;
+  }
+
+  private void setSystemAudioState(CallAudioState callAudioState) {
+    CallAudioState oldAudioState = mCallAudioState;
+    mCallAudioState = callAudioState;
+
+    LogUtil.i(
+        "VoicemailAudioManager.setSystemAudioState",
+        "changing from " + oldAudioState + " to " + mCallAudioState);
+
+    // Audio route.
+    if (mCallAudioState.getRoute() == CallAudioState.ROUTE_SPEAKER) {
+      turnOnSpeaker(true);
+    } else if (mCallAudioState.getRoute() == CallAudioState.ROUTE_EARPIECE
+        || mCallAudioState.getRoute() == CallAudioState.ROUTE_WIRED_HEADSET) {
+      // Just handle turning off the speaker, the system will handle switching between wired
+      // headset and earpiece.
+      turnOnSpeaker(false);
+      // BluetoothSco is not handled by the system so it has to be reset.
+      applyBluetoothScoState();
+    }
+  }
+
+  private void turnOnSpeaker(boolean on) {
+    if (mAudioManager.isSpeakerphoneOn() != on) {
+      LogUtil.i("VoicemailAudioManager.turnOnSpeaker", "turning speaker phone on: " + on);
+      mAudioManager.setSpeakerphoneOn(on);
+    }
+  }
+}