From 4917022452481f5143af1f2ecd3f9d221addf252 Mon Sep 17 00:00:00 2001
From: Garik Badalyan <garikb@codeaurora.org>
Date: Thu, 23 Oct 2014 18:33:16 -0700
Subject: IMS-VT: Enable SIP based video multitasking.

Enable SIP based video multitasking.

Change-Id: I3731e64617bde9278f13ff94ff829a3a90f467ce
---
 res/values/strings.xml                             |   2 +
 src/com/android/incallui/CallCardFragment.java     |   3 +
 src/com/android/incallui/CallList.java             |   4 +-
 src/com/android/incallui/CallUtils.java            |  64 ++++
 src/com/android/incallui/InCallActivity.java       |   2 +
 src/com/android/incallui/InCallPresenter.java      |  26 +-
 .../android/incallui/InCallVideoCallListener.java  |   9 +-
 src/com/android/incallui/VideoCallFragment.java    |   3 +
 src/com/android/incallui/VideoCallPresenter.java   |   2 +-
 src/com/android/incallui/VideoPauseController.java | 389 +++++++++++++++++++++
 10 files changed, 494 insertions(+), 10 deletions(-)
 create mode 100644 src/com/android/incallui/CallUtils.java
 create mode 100644 src/com/android/incallui/VideoPauseController.java

diff --git a/res/values/strings.xml b/res/values/strings.xml
index a5d9e131..80620086 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -117,6 +117,8 @@
     <string name="card_title_video_call_requesting">Requesting video</string>
     <!-- In-call screen: status label when there is a problem connecting a video call. -->
     <string name="card_title_video_call_error">Cannot connect video call</string>
+    <!-- In-call screen: status label when in a paused video call. -->
+    <string name="card_title_video_call_paused">Video call (Paused)</string>
 
     <!-- In-call screen: string shown to the user when their outgoing number is different than the
          number reported by TelephonyManager#getLine1Number() -->
diff --git a/src/com/android/incallui/CallCardFragment.java b/src/com/android/incallui/CallCardFragment.java
index ad847b9d..cee37d89 100644
--- a/src/com/android/incallui/CallCardFragment.java
+++ b/src/com/android/incallui/CallCardFragment.java
@@ -748,6 +748,9 @@ public class CallCardFragment extends BaseFragment<CallCardPresenter, CallCardPr
                 } else if (sessionModificationState
                         == Call.SessionModificationState.WAITING_FOR_RESPONSE) {
                     callStateLabel = context.getString(R.string.card_title_video_call_requesting);
+                } else if (VideoProfile.VideoState.isVideo(videoState) &&
+                        VideoProfile.VideoState.isPaused(videoState)) {
+                    callStateLabel = context.getString(R.string.card_title_video_call_paused);
                 } else if (VideoProfile.VideoState.isBidirectional(videoState)) {
                     callStateLabel = context.getString(R.string.card_title_video_call);
                 } else if (isWaitingForRemoteSide) {
diff --git a/src/com/android/incallui/CallList.java b/src/com/android/incallui/CallList.java
index 402e5c4f..61078e29 100644
--- a/src/com/android/incallui/CallList.java
+++ b/src/com/android/incallui/CallList.java
@@ -86,7 +86,9 @@ public class CallList implements InCallPhoneListener {
         @Override
         public void onCallAdded(Phone phone, android.telecom.Call telecommCall) {
             Call call = new Call(telecommCall);
-            if (call.getState() == Call.State.INCOMING) {
+            Log.d(this, "onCallAdded: callState=" + call.getState());
+            if (call.getState() == Call.State.INCOMING ||
+                    call.getState() == Call.State.CALL_WAITING) {
                 onIncoming(call, call.getCannedSmsResponses());
             } else {
                 onUpdate(call);
diff --git a/src/com/android/incallui/CallUtils.java b/src/com/android/incallui/CallUtils.java
new file mode 100644
index 00000000..bef8adeb
--- /dev/null
+++ b/src/com/android/incallui/CallUtils.java
@@ -0,0 +1,64 @@
+/* Copyright (c) 2014, The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package com.android.incallui;
+
+import android.telecom.VideoProfile;
+import com.google.common.base.Preconditions;
+
+public class CallUtils {
+
+    public static boolean isVideoCall(Call call) {
+        return call != null && VideoProfile.VideoState.isVideo(call.getVideoState());
+    }
+
+    // TODO (ims-vt) Check if special handling is needed for CONF calls.
+    public static boolean canVideoPause(Call call) {
+        return isVideoCall(call) && call.getState() == Call.State.ACTIVE;
+    }
+
+    public static VideoProfile makeVideoPauseProfile(Call call) {
+        Preconditions.checkNotNull(call);
+        Preconditions.checkState(!VideoProfile.VideoState.isAudioOnly(call.getVideoState()));
+        return new VideoProfile(toPausedVideoState(call.getVideoState()));
+    }
+
+    public static VideoProfile makeVideoUnPauseProfile(Call call) {
+        Preconditions.checkNotNull(call);
+        return new VideoProfile(toUnPausedVideoState(call.getVideoState()));
+    }
+
+    public static int toUnPausedVideoState(int videoState) {
+        return videoState & (~VideoProfile.VideoState.PAUSED);
+    }
+
+    public static int toPausedVideoState(int videoState) {
+        return videoState | VideoProfile.VideoState.PAUSED;
+    }
+
+}
diff --git a/src/com/android/incallui/InCallActivity.java b/src/com/android/incallui/InCallActivity.java
index 68ca2044..ed5c394e 100644
--- a/src/com/android/incallui/InCallActivity.java
+++ b/src/com/android/incallui/InCallActivity.java
@@ -233,6 +233,7 @@ public class InCallActivity extends Activity {
         // It is possible that the activity restarted because orientation changed.
         // Notify listeners if orientation changed.
         doOrientationChanged(getResources().getConfiguration().orientation);
+        InCallPresenter.getInstance().onActivityStarted();
     }
 
     @Override
@@ -281,6 +282,7 @@ public class InCallActivity extends Activity {
         Log.d(this, "onStop()...");
 
         InCallPresenter.getInstance().updateIsChangingConfigurations();
+        InCallPresenter.getInstance().onActivityStopped();
         super.onStop();
     }
 
diff --git a/src/com/android/incallui/InCallPresenter.java b/src/com/android/incallui/InCallPresenter.java
index 9743f0dc..35c527ae 100644
--- a/src/com/android/incallui/InCallPresenter.java
+++ b/src/com/android/incallui/InCallPresenter.java
@@ -215,6 +215,8 @@ public class InCallPresenter implements CallList.Listener, InCallPhoneListener {
         // will kick off an update and the whole process can start.
         mCallList.addListener(this);
 
+        VideoPauseController.getInstance().setUp(this);
+
         Log.d(this, "Finished InCallPresenter.setUp");
     }
 
@@ -230,6 +232,8 @@ public class InCallPresenter implements CallList.Listener, InCallPhoneListener {
         Log.d(this, "tearDown");
         mServiceConnected = false;
         attemptCleanup();
+
+        VideoPauseController.getInstance().tearDown();
     }
 
     private void attemptFinishActivity() {
@@ -647,6 +651,7 @@ public class InCallPresenter implements CallList.Listener, InCallPhoneListener {
         if(mInCallActivity!=null) {
             mIsChangingConfigurations = mInCallActivity.isChangingConfigurations();
         }
+        Log.d(this, "IsChangingConfigurations=" + mIsChangingConfigurations);
     }
 
 
@@ -679,12 +684,31 @@ public class InCallPresenter implements CallList.Listener, InCallPhoneListener {
 
         if (showing) {
             mIsActivityPreviouslyStarted = true;
-            mIsChangingConfigurations = false;
         } else {
             updateIsChangingConfigurations();
         }
     }
 
+    /*package*/
+    void onActivityStarted() {
+        Log.d(this, "onActivityStarted");
+        notifyVideoPauseController(true);
+    }
+
+    /*package*/
+    void onActivityStopped() {
+        Log.d(this, "onActivityStopped");
+        notifyVideoPauseController(false);
+    }
+
+    private void notifyVideoPauseController(boolean showing) {
+        Log.d(this, "notifyVideoPauseController: mIsChangingConfigurations=" +
+                    mIsChangingConfigurations);
+        if (!mIsChangingConfigurations) {
+            VideoPauseController.getInstance().onUiShowing(showing);
+        }
+    }
+
     /**
      * Brings the app into the foreground if possible.
      */
diff --git a/src/com/android/incallui/InCallVideoCallListener.java b/src/com/android/incallui/InCallVideoCallListener.java
index 59060458..23319922 100644
--- a/src/com/android/incallui/InCallVideoCallListener.java
+++ b/src/com/android/incallui/InCallVideoCallListener.java
@@ -49,13 +49,11 @@ public class InCallVideoCallListener extends VideoCall.Listener {
     @Override
     public void onSessionModifyRequestReceived(VideoProfile videoProfile) {
         Log.d(this, " onSessionModifyRequestReceived videoProfile=" + videoProfile);
-        int previousVideoState = mCall.getVideoState();
-        int newVideoState = videoProfile.getVideoState();
+        int previousVideoState = CallUtils.toUnPausedVideoState(mCall.getVideoState());
+        int newVideoState = CallUtils.toUnPausedVideoState(videoProfile.getVideoState());
 
         boolean wasVideoCall = VideoProfile.VideoState.isVideo(previousVideoState);
         boolean isVideoCall = VideoProfile.VideoState.isVideo(newVideoState);
-        boolean wasPaused = VideoProfile.VideoState.isPaused(previousVideoState);
-        boolean isPaused = VideoProfile.VideoState.isPaused(newVideoState);
 
         // Check for upgrades to video and downgrades to audio.
         if (wasVideoCall && !isVideoCall) {
@@ -63,9 +61,6 @@ public class InCallVideoCallListener extends VideoCall.Listener {
         } else if (previousVideoState != newVideoState) {
             InCallVideoCallListenerNotifier.getInstance().upgradeToVideoRequest(mCall);
         }
-
-        boolean pause = !wasPaused && isPaused;
-        InCallVideoCallListenerNotifier.getInstance().peerPausedStateChanged(mCall, pause);
     }
 
     /**
diff --git a/src/com/android/incallui/VideoCallFragment.java b/src/com/android/incallui/VideoCallFragment.java
index 2e43c5ad..54da8ae7 100644
--- a/src/com/android/incallui/VideoCallFragment.java
+++ b/src/com/android/incallui/VideoCallFragment.java
@@ -160,6 +160,9 @@ public class VideoCallFragment extends BaseFragment<VideoCallPresenter,
                     + " areSameSurfaces=" + areSameSurfaces);
             if (mSavedSurfaceTexture != null && !areSameSurfaces) {
                 mTextureView.setSurfaceTexture(mSavedSurfaceTexture);
+                if (createSurface()) {
+                    onSurfaceCreated();
+                }
             }
             mIsDoneWithSurface = false;
         }
diff --git a/src/com/android/incallui/VideoCallPresenter.java b/src/com/android/incallui/VideoCallPresenter.java
index 68a2051b..c10d76a2 100644
--- a/src/com/android/incallui/VideoCallPresenter.java
+++ b/src/com/android/incallui/VideoCallPresenter.java
@@ -280,7 +280,7 @@ public class VideoCallPresenter extends Presenter<VideoCallPresenter.VideoCallUi
             mVideoCall.setDisplaySurface(null);
         } else if (surface == VideoCallFragment.SURFACE_PREVIEW) {
             mVideoCall.setPreviewSurface(null);
-            mVideoCall.setCamera(null);
+            enableCamera(false);
         }
     }
 
diff --git a/src/com/android/incallui/VideoPauseController.java b/src/com/android/incallui/VideoPauseController.java
new file mode 100644
index 00000000..e17d8a0b
--- /dev/null
+++ b/src/com/android/incallui/VideoPauseController.java
@@ -0,0 +1,389 @@
+/* Copyright (c) 2014, The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package com.android.incallui;
+
+import android.os.SystemProperties;
+import android.telecom.VideoProfile;
+import com.android.incallui.Call.State;
+import com.android.incallui.InCallPresenter.InCallState;
+import com.android.incallui.InCallPresenter.InCallStateListener;
+import com.android.incallui.InCallPresenter.IncomingCallListener;
+import com.android.incallui.InCallVideoCallListenerNotifier.SessionModificationListener;
+import com.android.internal.util.Preconditions;
+
+/**
+ * The class is responsible for generating video pause/resume request.
+ */
+class VideoPauseController implements InCallStateListener, IncomingCallListener,
+        SessionModificationListener {
+    private static final String TAG = "VideoCallPauseController:";
+
+    private class CallContext {
+        public CallContext(Call call) {
+            Preconditions.checkNotNull(call);
+            update(call);
+        }
+
+        public void update(Call call) {
+            mCall = Preconditions.checkNotNull(call);
+            mState = call.getState();
+            mId = call.getId();
+            mVideoState = call.getVideoState();
+        }
+
+        public int getState() {
+            return mState;
+        }
+
+        public String getId() {
+            return mId;
+        }
+
+        public int getVideoState() {
+            return mVideoState;
+        }
+
+        public String toString() {
+            return String.format("CallContext {CallId=%s, State=%s, VideoState=",
+                    mId, mState, mVideoState);
+        }
+
+        public Call getCall() {
+            return mCall;
+        }
+
+        private int mState = State.INVALID;
+        private String mId;
+        private int mVideoState;
+        private Call mCall;
+    }
+
+    private InCallPresenter mInCallPresenter;
+    private static VideoPauseController sVideoPauseController;
+
+    private CallContext mPrimaryCallContext = null; // Context of primary call, if any.
+    private boolean mIsInBackground = false; // True if UI is not visible, false otherwise.
+    private int mVideoPauseMode = VIDEO_PAUSE_MODE_DISABLED;
+
+    /**
+     * Stores current video pause mode.
+     * 0 - Video Pause is disabled.
+     * 1 - Video Pause is enabled.
+     */
+    private static final String PROPERTY_VIDEO_PAUSE_MODE = "persist.radio.videopause.mode";
+    private static int VIDEO_PAUSE_MODE_DISABLED = 0;
+    private static int VIDEO_PAUSE_MODE_ENABLED = 1;
+
+    private VideoPauseController() {
+        mVideoPauseMode = SystemProperties.getInt(PROPERTY_VIDEO_PAUSE_MODE,
+                VIDEO_PAUSE_MODE_DISABLED);
+        if (mVideoPauseMode != VIDEO_PAUSE_MODE_ENABLED) { // Validate the mode before using.
+            mVideoPauseMode = VIDEO_PAUSE_MODE_DISABLED;
+        }
+    }
+
+    /*package*/
+    static synchronized VideoPauseController getInstance() {
+        if (sVideoPauseController == null) {
+            sVideoPauseController = new VideoPauseController();
+        }
+        return sVideoPauseController;
+    }
+
+    public void setUp(InCallPresenter inCallPresenter) {
+        if (!isVideoPausedEnabled()) {
+            return;
+        }
+
+        log("setUp...");
+        mInCallPresenter = Preconditions.checkNotNull(inCallPresenter);
+        mInCallPresenter.addListener(this);
+        mInCallPresenter.addIncomingCallListener(this);
+        InCallVideoCallListenerNotifier.getInstance().addSessionModificationListener(this);
+    }
+
+    public void tearDown() {
+        if (!isVideoPausedEnabled()) {
+            return;
+        }
+
+        log("tearDown...");
+        InCallVideoCallListenerNotifier.getInstance().removeSessionModificationListener(this);
+        mInCallPresenter.removeListener(this);
+        mInCallPresenter.removeIncomingCallListener(this);
+        clear();
+    }
+
+    private void clear() {
+        mInCallPresenter = null;
+        mPrimaryCallContext = null;
+        mIsInBackground = false;
+    }
+
+    /**
+     * The function gets called when call state changes.
+     * @param state Phone state.
+     * @param callList List of current call.
+     */
+    @Override
+    public void onStateChange(InCallState oldState, InCallState newState, CallList callList) {
+        log("onStateChange, OldState=" + oldState + " NewState=" + newState);
+
+        Call call = null;
+        if (newState == InCallState.INCOMING) {
+            call = callList.getIncomingCall();
+        } else if (newState == InCallState.WAITING_FOR_ACCOUNT) {
+            call = callList.getWaitingForAccountCall();
+        } else if (newState == InCallState.PENDING_OUTGOING) {
+            call = callList.getPendingOutgoingCall();
+        } else if (newState == InCallState.OUTGOING) {
+            call = callList.getOutgoingCall();
+        } else {
+            call = callList.getActiveCall();
+        }
+
+        boolean hasPrimaryCallChanged = !areSame(call, mPrimaryCallContext);
+        boolean canVideoPause = CallUtils.canVideoPause(call);
+        log("onStateChange, hasPrimaryCallChanged=" + hasPrimaryCallChanged);
+        log("onStateChange, canVideoPause=" + canVideoPause);
+        log("onStateChange, IsInBackground=" + mIsInBackground);
+
+        if (hasPrimaryCallChanged) {
+            onPrimaryCallChanged(call);
+            return;
+        }
+
+        if (isOutgoing(mPrimaryCallContext) && canVideoPause && mIsInBackground) {
+            // Bring UI to foreground if outgoing request becomes active while UI is in
+            // background.
+            bringToForeground();
+        } else if (!isVideoCall(mPrimaryCallContext) && canVideoPause && mIsInBackground) {
+            // Bring UI to foreground if VoLTE call becomes active while UI is in
+            // background.
+            bringToForeground();
+        }
+
+        updatePrimaryCallContext(call);
+    }
+
+    private void onPrimaryCallChanged(Call call) {
+        log("onPrimaryCallChanged: New call = " + call);
+        log("onPrimaryCallChanged: Old call = " + mPrimaryCallContext);
+        log("onPrimaryCallChanged, IsInBackground=" + mIsInBackground);
+
+        Preconditions.checkState(!areSame(call, mPrimaryCallContext));
+        final boolean canVideoPause = CallUtils.canVideoPause(call);
+
+        if (isWaitingCall(mPrimaryCallContext) && canVideoPause && !mIsInBackground) {
+            // Send resume request for the active call, if user rejects incoming
+            // call and UI is in foreground.
+            sendRequest(call, true);
+        } else if (isWaitingCall(call) && canVideoPause(mPrimaryCallContext)) {
+            // Send pause request if there is an active video call, and we just received a new
+            // incoming call.
+            sendRequest(mPrimaryCallContext.getCall(), false);
+        } else if (isOutgoing(mPrimaryCallContext) && canVideoPause && !mIsInBackground) {
+            // Send resume request for the active call, if user ends outgoing call
+            // and UI is in foreground.
+            sendRequest(call, true);
+        }
+
+        updatePrimaryCallContext(call);
+    }
+
+    /**
+     * The function gets called when InCallUI receives a new incoming call.
+     */
+    @Override
+    public void onIncomingCall(InCallState oldState, InCallState newState, Call call) {
+        log("onIncomingCall, OldState=" + oldState + " NewState=" + newState + " Call=" + call);
+
+        if (areSame(call, mPrimaryCallContext)) {
+            return;
+        }
+
+        onPrimaryCallChanged(call);
+    }
+
+    private void updatePrimaryCallContext(Call call) {
+        if (call == null) {
+            mPrimaryCallContext = null;
+        } else if (mPrimaryCallContext != null) {
+            mPrimaryCallContext.update(call);
+        } else {
+            mPrimaryCallContext = new CallContext(call);
+        }
+    }
+
+    /**
+     * Called when UI goes in/out of the foreground.
+     * @param showing true if UI is in the foreground, false otherwise.
+     */
+    public void onUiShowing(boolean showing) {
+        if (!isVideoPausedEnabled() || mInCallPresenter == null) {
+            return;
+        }
+
+        final boolean notify = mInCallPresenter.getInCallState() == InCallState.INCALL;
+        if (showing) {
+            onResume(notify);
+        } else {
+            onPause(notify);
+        }
+    }
+
+    @Override
+    public void onUpgradeToVideoRequest(Call call) {
+    }
+
+    @Override
+    public void onUpgradeToVideoSuccess(Call call) {
+    }
+
+    @Override
+    public void onUpgradeToVideoFail(int status, Call call) {
+        // TODO (ims-vt) Automatically bring in call ui to foreground.
+    }
+
+    @Override
+    public void onDowngradeToAudio(Call call) {
+    }
+
+    /**
+     * Called when UI becomes visible. This will send resume request for current video call, if any.
+     */
+    private void onResume(boolean notify) {
+        log("onResume: notify=" + notify);
+
+        mIsInBackground = false;
+        if (canVideoPause(mPrimaryCallContext) && notify) {
+            sendRequest(mPrimaryCallContext.getCall(), true);
+        } else {
+            log("onResume. Ignoring...");
+        }
+    }
+
+    /**
+     * Called when UI becomes invisible. This will send pause request for current video call, if any.
+     */
+    private void onPause(boolean notify) {
+        log("onPause: notify=" + notify);
+
+        mIsInBackground = true;
+        if (canVideoPause(mPrimaryCallContext) && notify) {
+            sendRequest(mPrimaryCallContext.getCall(), false);
+        } else {
+            log("onPause, Ignoring...");
+        }
+    }
+
+    private void bringToForeground() {
+        if (mInCallPresenter != null) {
+            log("Bringing UI to foreground");
+            mInCallPresenter.bringToForeground(false);
+        } else {
+            loge("InCallPresenter is null. Cannot bring UI to foreground");
+        }
+    }
+
+    /**
+     * Sends Pause/Resume request.
+     * @param call Call to be paused/resumed.
+     * @param resume If true resume request will be sent, otherwise pause request.
+     */
+    private void sendRequest(Call call, boolean resume) {
+        if (resume) {
+            log("sending resume request, call=" + call);
+            call.getVideoCall().sendSessionModifyRequest(CallUtils.makeVideoUnPauseProfile(call));
+        } else {
+            log("sending pause request, call=" + call);
+            call.getVideoCall().sendSessionModifyRequest(CallUtils.makeVideoPauseProfile(call));
+        }
+    }
+
+    private boolean isVideoPausedEnabled() {
+        return mVideoPauseMode != VIDEO_PAUSE_MODE_DISABLED;
+    }
+
+    private static boolean areSame(Call call, CallContext callContext) {
+        if (call == null && callContext == null) {
+            return true;
+        } else if (call == null || callContext == null) {
+            return false;
+        }
+        return call.getId().equals(callContext.getId());
+    }
+
+    private static boolean areSame(CallContext callContext, Call call) {
+        return areSame(call, callContext);
+    }
+
+    private static boolean canVideoPause(CallContext callContext) {
+        return isVideoCall(callContext) && callContext.getState() == Call.State.ACTIVE;
+    }
+
+    private static boolean isVideoCall(CallContext callContext) {
+        return callContext != null && VideoProfile.VideoState.isVideo(callContext.getVideoState());
+    }
+
+    /**
+     * Returns true if call is in incoming/waiting state, false otherwise.
+     */
+    private static boolean isWaitingCall(CallContext call) {
+        return call != null && (call.getState() == Call.State.CALL_WAITING
+                || call.getState() == Call.State.INCOMING);
+    }
+
+    private static boolean isWaitingCall(Call call) {
+        return call != null && (call.getState() == Call.State.CALL_WAITING
+                || call.getState() == Call.State.INCOMING);
+    }
+
+    /**
+     * Returns true if the call is outgoing, false otherwise
+     */
+    private static boolean isOutgoing(CallContext call) {
+        return call != null && Call.State.isDialing(call.getState());
+    }
+
+    /**
+     * Returns true if the call is on hold, false otherwise
+     */
+    private static boolean isHolding(CallContext call) {
+        return call != null && call.getState() == Call.State.ONHOLD;
+    }
+
+    private void log(String msg) {
+        Log.d(this, TAG + msg);
+    }
+
+    private void loge(String msg) {
+        Log.e(this, TAG + msg);
+    }
+}
-- 
cgit v1.2.3