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+/*
+ * Copyright (C) 2016 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.ims.internal;
+
+import android.telecom.Log;
+import android.telecom.VideoProfile;
+import android.util.ArraySet;
+
+import java.util.Collection;
+import java.util.Set;
+import java.util.StringJoiner;
+import java.util.stream.Collectors;
+
+/**
+ * Used by an {@link ImsVideoCallProviderWrapper} to track requests to pause video from various
+ * sources.
+ *
+ * Requests to pause the video stream using the {@link VideoProfile#STATE_PAUSED} bit can come
+ * from both the {@link android.telecom.InCallService}, as well as via the
+ * {@link ImsVideoCallProviderWrapper#pauseVideo(int, int)} and
+ * {@link ImsVideoCallProviderWrapper#resumeVideo(int, int)} methods. As a result, multiple sources
+ * can potentially pause or resume the video stream.
+ *
+ * This class is responsible for tracking any active requests to pause the video.
+ */
+public class VideoPauseTracker {
+ /** The pause or resume request originated from an InCallService. */
+ public static final int SOURCE_INCALL = 1;
+
+ /**
+ * The pause or resume request originated from a change to the data enabled state from the
+ * {@code ImsPhoneCallTracker#onDataEnabledChanged(boolean, int)} callback. This happens when
+ * the user reaches their data limit or enables and disables data.
+ */
+ public static final int SOURCE_DATA_ENABLED = 2;
+
+ private static final String SOURCE_INCALL_STR = "INCALL";
+ private static final String SOURCE_DATA_ENABLED_STR = "DATA_ENABLED";
+
+ /**
+ * Tracks the current sources of pause requests.
+ */
+ private Set<Integer> mPauseRequests = new ArraySet<Integer>(2);
+
+ /**
+ * Lock for the {@link #mPauseRequests} {@link ArraySet}.
+ */
+ private Object mPauseRequestsLock = new Object();
+
+ /**
+ * Tracks a request to pause the video for a source (see {@link #SOURCE_DATA_ENABLED},
+ * {@link #SOURCE_INCALL}) and determines whether a pause request should be issued to the
+ * video provider.
+ *
+ * We want to issue a pause request to the provider when we receive the first request
+ * to pause via any source and we're not already paused.
+ *
+ * @param source The source of the pause request.
+ * @return {@code true} if a pause should be issued to the
+ * {@link com.android.ims.internal.ImsVideoCallProvider}, {@code false} otherwise.
+ */
+ public boolean shouldPauseVideoFor(int source) {
+ synchronized (mPauseRequestsLock) {
+ boolean wasPaused = isPaused();
+ mPauseRequests.add(source);
+
+ if (!wasPaused) {
+ Log.i(this, "shouldPauseVideoFor: source=%s, pendingRequests=%s - should pause",
+ sourceToString(source), sourcesToString(mPauseRequests));
+ // There were previously no pause requests, but there is one now, so pause.
+ return true;
+ } else {
+ Log.i(this, "shouldPauseVideoFor: source=%s, pendingRequests=%s - already paused",
+ sourceToString(source), sourcesToString(mPauseRequests));
+ // There were already pause requests, so no need to re-pause.
+ return false;
+ }
+ }
+ }
+
+ /**
+ * Tracks a request to resume the video for a source (see {@link #SOURCE_DATA_ENABLED},
+ * {@link #SOURCE_INCALL}) and determines whether a resume request should be issued to the
+ * video provider.
+ *
+ * We want to issue a resume request to the provider when we have issued a corresponding
+ * resume for each previously issued pause.
+ *
+ * @param source The source of the resume request.
+ * @return {@code true} if a resume should be issued to the
+ * {@link com.android.ims.internal.ImsVideoCallProvider}, {@code false} otherwise.
+ */
+ public boolean shouldResumeVideoFor(int source) {
+ synchronized (mPauseRequestsLock) {
+ boolean wasPaused = isPaused();
+ mPauseRequests.remove(source);
+ boolean isPaused = isPaused();
+
+ if (wasPaused && !isPaused) {
+ Log.i(this, "shouldResumeVideoFor: source=%s, pendingRequests=%s - should resume",
+ sourceToString(source), sourcesToString(mPauseRequests));
+ // This was the last pause request, so resume video.
+ return true;
+ } else if (wasPaused && isPaused) {
+ Log.i(this, "shouldResumeVideoFor: source=%s, pendingRequests=%s - stay paused",
+ sourceToString(source), sourcesToString(mPauseRequests));
+ // There are still pending pause requests, so don't resume.
+ return false;
+ } else {
+ Log.i(this, "shouldResumeVideoFor: source=%s, pendingRequests=%s - not paused",
+ sourceToString(source), sourcesToString(mPauseRequests));
+ // Video wasn't paused, so don't resume.
+ return false;
+ }
+ }
+ }
+
+ /**
+ * @return {@code true} if the video should be paused, {@code false} otherwise.
+ */
+ public boolean isPaused() {
+ synchronized (mPauseRequestsLock) {
+ return !mPauseRequests.isEmpty();
+ }
+ }
+
+ /**
+ * @param source the source of the pause.
+ * @return {@code true} if the specified source initiated a pause request and the video is
+ * currently paused, {@code false} otherwise.
+ */
+ public boolean wasVideoPausedFromSource(int source) {
+ synchronized (mPauseRequestsLock) {
+ return mPauseRequests.contains(source);
+ }
+ }
+
+ /**
+ * Returns a string equivalent of a {@code SOURCE_*} constant.
+ *
+ * @param source A {@code SOURCE_*} constant.
+ * @return String equivalent of the source.
+ */
+ private String sourceToString(int source) {
+ switch (source) {
+ case SOURCE_DATA_ENABLED:
+ return SOURCE_DATA_ENABLED_STR;
+ case SOURCE_INCALL:
+ return SOURCE_INCALL_STR;
+ }
+ return "unknown";
+ }
+
+ /**
+ * Returns a comma separated list of sources.
+ *
+ * @param sources The sources.
+ * @return Comma separated list of sources.
+ */
+ private String sourcesToString(Collection<Integer> sources) {
+ synchronized (mPauseRequestsLock) {
+ return sources.stream()
+ .map(source -> sourceToString(source))
+ .collect(Collectors.joining(", "));
+ }
+ }
+}