Update our paused flag based on call session events

This fixes a bug where we would remember being paused after receiving a second
call incorrectly after we swap back to it.

@tgunn, adding you here to double-check I am interpreting those call session events correctly.

PiperOrigin-RevId: 159623587
Change-Id: Ic52e3e9046f767321a48e22274b8a1c27b4dfa86

2 files changed, 30 insertions, 1 deletions

diff --git a/java/com/android/incallui/videotech/ims/ImsVideoCallCallback.java b/java/com/android/incallui/videotech/ims/ImsVideoCallCallback.java
index 17c2e6518..f4e0a01ea 100644
--- a/java/com/android/incallui/videotech/ims/ImsVideoCallCallback.java
+++ b/java/com/android/incallui/videotech/ims/ImsVideoCallCallback.java
@@ -161,14 +161,23 @@ public class ImsVideoCallCallback extends VideoCall.Callback {
     }
   }
 
+  // In the vendor code rx_pause and rx_resume get triggered when the video player starts or stops
+  // playing the incoming video stream.  For the case where you're resuming a held call, its
+  // definitely a good signal to use to know that the video is resuming (though the video state
+  // should change to indicate its not paused in this case as well).  However, keep in mind you'll
+  // get these signals as well on carriers that don't support the video pause signalling (like TMO)
+  // so you want to ensure you don't send sessionModifyRequests with pause/resume based on these
+  // signals. Also, its technically possible to have a pause/resume if the video signal degrades.
   @Override
   public void onCallSessionEvent(int event) {
     switch (event) {
       case Connection.VideoProvider.SESSION_EVENT_RX_PAUSE:
         LogUtil.i("ImsVideoCallCallback.onCallSessionEvent", "rx_pause");
+        videoTech.onPausedEvent();
         break;
       case Connection.VideoProvider.SESSION_EVENT_RX_RESUME:
         LogUtil.i("ImsVideoCallCallback.onCallSessionEvent", "rx_resume");
+        videoTech.onResumedEvent();
         break;
       case Connection.VideoProvider.SESSION_EVENT_CAMERA_FAILURE:
         LogUtil.i("ImsVideoCallCallback.onCallSessionEvent", "camera_failure");
diff --git a/java/com/android/incallui/videotech/ims/ImsVideoTech.java b/java/com/android/incallui/videotech/ims/ImsVideoTech.java
index a6cef7b81..3d73e4e7d 100644
--- a/java/com/android/incallui/videotech/ims/ImsVideoTech.java
+++ b/java/com/android/incallui/videotech/ims/ImsVideoTech.java
@@ -19,6 +19,7 @@ package com.android.incallui.videotech.ims;
 import android.content.Context;
 import android.os.Build;
 import android.support.annotation.Nullable;
+import android.support.annotation.VisibleForTesting;
 import android.telecom.Call;
 import android.telecom.Call.Details;
 import android.telecom.VideoProfile;
@@ -40,7 +41,8 @@ public class ImsVideoTech implements VideoTech {
   private @SessionModificationState int sessionModificationState =
       SessionModificationState.NO_REQUEST;
   private int previousVideoState = VideoProfile.STATE_AUDIO_ONLY;
-  private boolean paused = false;
+
+  @VisibleForTesting boolean paused = false;
 
   public ImsVideoTech(LoggingBindings logger, VideoTechListener listener, Call call) {
     this.logger = logger;
@@ -247,6 +249,24 @@ public class ImsVideoTech implements VideoTech {
     call.getVideoCall().setDeviceOrientation(rotation);
   }
 
+  /**
+   * Called when we receive an rx_pause from the IMS stack. Update our state so we know we are
+   * currently paused. This is important in the cases where we swap calls since pause() and
+   * unpause() are not called.
+   */
+  void onPausedEvent() {
+    paused = true;
+  }
+
+  /**
+   * Called when we receive an rx_resume from the IMS stack. Update our state so we know we are
+   * currently not paused. This is important in the cases where we swap calls since pause() and
+   * unpause() are not called.
+   */
+  void onResumedEvent() {
+    paused = false;
+  }
+
   private boolean canPause() {
     return call.getDetails().can(Details.CAPABILITY_CAN_PAUSE_VIDEO)
         && call.getState() == Call.STATE_ACTIVE