android-16.0.0_r2/s

/*
 * Copyright (C) 2020 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.systemui.media.controls.domain.pipeline

import android.annotation.WorkerThread
import android.media.session.MediaController
import android.media.session.MediaSession
import android.media.session.PlaybackState
import android.os.SystemProperties
import com.android.internal.annotations.VisibleForTesting
import com.android.systemui.dagger.SysUISingleton
import com.android.systemui.dagger.qualifiers.Background
import com.android.systemui.dagger.qualifiers.Main
import com.android.systemui.media.NotificationMediaManager.isPlayingState
import com.android.systemui.media.controls.shared.model.MediaData
import com.android.systemui.media.controls.util.MediaControllerFactory
import com.android.systemui.plugins.statusbar.StatusBarStateController
import com.android.systemui.statusbar.SysuiStatusBarStateController
import com.android.systemui.util.concurrency.DelayableExecutor
import com.android.systemui.util.time.SystemClock
import java.util.concurrent.Executor
import java.util.concurrent.TimeUnit
import javax.inject.Inject

@VisibleForTesting
val PAUSED_MEDIA_TIMEOUT =
    SystemProperties.getLong("debug.sysui.media_timeout", TimeUnit.MINUTES.toMillis(10))

@VisibleForTesting
val RESUME_MEDIA_TIMEOUT =
    SystemProperties.getLong("debug.sysui.media_timeout_resume", TimeUnit.DAYS.toMillis(2))

/** Controller responsible for keeping track of playback states and expiring inactive streams. */
@SysUISingleton
class MediaTimeoutListener
@Inject
constructor(
    private val mediaControllerFactory: MediaControllerFactory,
    @Background private val bgExecutor: Executor,
    @Main private val uiExecutor: Executor,
    @Main private val mainExecutor: DelayableExecutor,
    private val logger: MediaTimeoutLogger,
    statusBarStateController: SysuiStatusBarStateController,
    private val systemClock: SystemClock,
) : MediaDataManager.Listener {

    private val mediaListeners: MutableMap<String, PlaybackStateListener> = mutableMapOf()

    /**
     * Callback representing that a media object is now expired:
     *
     * @param key Media control unique identifier
     * @param timedOut True when expired for {@code PAUSED_MEDIA_TIMEOUT} for active media,
     * ```
     *                 or {@code RESUME_MEDIA_TIMEOUT} for resume media
     * ```
     */
    lateinit var timeoutCallback: (String, Boolean) -> Unit

    /**
     * Callback representing that a media object [PlaybackState] has changed.
     *
     * @param key Media control unique identifier
     * @param state The new [PlaybackState]
     */
    lateinit var stateCallback: (String, PlaybackState) -> Unit

    /**
     * Callback representing that the [MediaSession] for an active control has been destroyed
     *
     * @param key Media control unique identifier
     */
    lateinit var sessionCallback: (String) -> Unit

    init {
        statusBarStateController.addCallback(
            object : StatusBarStateController.StateListener {
                override fun onDozingChanged(isDozing: Boolean) {
                    if (!isDozing) {
                        // Check whether any timeouts should have expired
                        mediaListeners.forEach { (key, listener) ->
                            if (
                                listener.cancellation != null &&
                                    listener.expiration <= systemClock.elapsedRealtime()
                            ) {
                                // We dozed too long - timeout now, and cancel the pending one
                                listener.expireMediaTimeout(key, "timeout happened while dozing")
                                listener.doTimeout()
                            }
                        }
                    }
                }
            }
        )
    }

    override fun onMediaDataLoaded(
        key: String,
        oldKey: String?,
        data: MediaData,
        immediately: Boolean,
        receivedSmartspaceCardLatency: Int,
        isSsReactivated: Boolean,
    ) {
        var reusedListener: PlaybackStateListener? = null

        // First check if we already have a listener
        mediaListeners.get(key)?.let {
            if (!it.destroyed) {
                return
            }

            // If listener was destroyed previously, we'll need to re-register it
            logger.logReuseListener(key)
            reusedListener = it
        }

        // Having an old key means that we're migrating from/to resumption. We should update
        // the old listener to make sure that events will be dispatched to the new location.
        val migrating = oldKey != null && key != oldKey
        if (migrating) {
            reusedListener = mediaListeners.remove(oldKey)
            logger.logMigrateListener(oldKey, key, reusedListener != null)
        }

        reusedListener?.let {
            bgExecutor.execute {
                val wasPlaying = it.isPlaying()
                logger.logUpdateListener(key, wasPlaying)
                it.setMediaData(data)
                it.key = key
                mediaListeners[key] = it
                if (wasPlaying != it.isPlaying()) {
                    // If a player becomes active because of a migration, we'll need to broadcast
                    // its state. Doing it now would lead to reentrant callbacks, so let's wait
                    // until we're done.
                    mainExecutor.execute {
                        if (mediaListeners[key]?.isPlaying() == true) {
                            logger.logDelayedUpdate(key)
                            timeoutCallback.invoke(key, false /* timedOut */)
                        }
                    }
                }
            }
            return
        }

        mediaListeners[key] = PlaybackStateListener(key, data)
    }

    override fun onMediaDataRemoved(key: String, userInitiated: Boolean) {
        mediaListeners.remove(key)?.destroy()
    }

    fun isTimedOut(key: String): Boolean {
        return mediaListeners[key]?.timedOut ?: false
    }

    private inner class PlaybackStateListener(var key: String, data: MediaData) :
        MediaController.Callback() {

        var timedOut = false
        var lastState: PlaybackState? = null
        var resumption: Boolean? = null
        var destroyed = false
        var expiration = Long.MAX_VALUE
        var sessionToken: MediaSession.Token? = null

        // Resume controls may have null token
        private var mediaController: MediaController? = null
        var cancellation: Runnable? = null
            private set

        fun Int.isPlaying() = isPlayingState(this)

        fun isPlaying() = lastState?.state?.isPlaying() ?: false

        init {
            bgExecutor.execute { setMediaData(data) }
        }

        fun destroy() {
            bgExecutor.execute { mediaController?.unregisterCallback(this) }
            cancellation?.run()
            destroyed = true
        }

        @WorkerThread
        fun setMediaData(data: MediaData) {
            sessionToken = data.token
            destroyed = false
            mediaController?.unregisterCallback(this)
            mediaController =
                if (data.token != null) {
                    mediaControllerFactory.create(data.token)
                } else {
                    null
                }
            mediaController?.registerCallback(this)
            // Let's register the cancellations, but not dispatch events now.
            // Timeouts didn't happen yet and reentrant events are troublesome.
            processState(
                mediaController?.playbackState,
                dispatchEvents = false,
                currentResumption = data.resumption,
            )
        }

        override fun onPlaybackStateChanged(state: PlaybackState?) {
            bgExecutor.execute {
                processState(state, dispatchEvents = true, currentResumption = resumption)
            }
        }

        override fun onSessionDestroyed() {
            logger.logSessionDestroyed(key)
            if (resumption == true) {
                // Some apps create a session when MBS is queried. We should unregister the
                // controller since it will no longer be valid, but don't cancel the timeout
                bgExecutor.execute { mediaController?.unregisterCallback(this) }
            } else {
                // For active controls, if the session is destroyed, clean up everything since we
                // will need to recreate it if this key is updated later
                sessionCallback.invoke(key)
                destroy()
            }
        }

        @WorkerThread
        private fun processState(
            state: PlaybackState?,
            dispatchEvents: Boolean,
            currentResumption: Boolean?,
        ) {
            logger.logPlaybackState(key, state)

            val playingStateSame = (state?.state?.isPlaying() == isPlaying())
            val actionsSame =
                (lastState?.actions == state?.actions) &&
                    areCustomActionListsEqual(lastState?.customActions, state?.customActions)
            val resumptionChanged = resumption != currentResumption

            lastState = state

            if ((!actionsSame || !playingStateSame) && state != null && dispatchEvents) {
                logger.logStateCallback(key)
                uiExecutor.execute { stateCallback.invoke(key, state) }
            }

            if (playingStateSame && !resumptionChanged) {
                return
            }
            resumption = currentResumption

            val playing = isPlaying()
            if (!playing) {
                logger.logScheduleTimeout(key, playing, resumption!!)
                if (cancellation != null && !resumptionChanged) {
                    // if the media changed resume state, we'll need to adjust the timeout length
                    logger.logCancelIgnored(key)
                    return
                }
                expireMediaTimeout(key, "PLAYBACK STATE CHANGED - $state, $resumption")
                val timeout =
                    if (currentResumption == true) {
                        RESUME_MEDIA_TIMEOUT
                    } else {
                        PAUSED_MEDIA_TIMEOUT
                    }
                expiration = systemClock.elapsedRealtime() + timeout
                cancellation = mainExecutor.executeDelayed({ doTimeout() }, timeout)
            } else {
                expireMediaTimeout(key, "playback started - $state, $key")
                timedOut = false
                if (dispatchEvents) {
                    uiExecutor.execute { timeoutCallback(key, timedOut) }
                }
            }
        }

        fun doTimeout() {
            cancellation = null
            logger.logTimeout(key)
            timedOut = true
            expiration = Long.MAX_VALUE
            // this event is async, so it's safe even when `dispatchEvents` is false
            timeoutCallback(key, timedOut)
        }

        fun expireMediaTimeout(mediaKey: String, reason: String) {
            cancellation?.apply {
                logger.logTimeoutCancelled(mediaKey, reason)
                run()
            }
            expiration = Long.MAX_VALUE
            cancellation = null
        }
    }
}