Begin refactor of MediaFocusControl

/*

 * Copyright (C) 2014 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 android.media;

import android.app.PendingIntent;

import android.content.ComponentName;

import android.media.MediaFocusControl.RcClientDeathHandler;

import android.os.IBinder;

import android.os.IBinder.DeathRecipient;

import android.os.RemoteException;

import android.util.Log;

import java.io.PrintWriter;

/**

 * @hide

 * Class to handle all the information about a media player, encapsulating information

 * about its use RemoteControlClient, playback type and volume... The lifecycle of each

 * instance is managed by android.media.MediaFocusControl, from its addition to the player stack

 * stack to its release.

 */

class MediaController implements DeathRecipient {

    // on purpose not using this classe's name, as it will only be used from MediaFocusControl

    private static final String TAG = "MediaFocusControl";

    private static final boolean DEBUG = false;

    /**

     * A global counter for RemoteControlClient identifiers

     */

    private static int sLastRccId = 0;

    //FIXME should be final static

    public MediaFocusControl mController;

    /**

     * The target for the ACTION_MEDIA_BUTTON events.

     * Always non null.

     */

    final public PendingIntent mMediaIntent;

    /**

     * The registered media button event receiver.

     * Always non null.

     */

    final public ComponentName mReceiverComponent;

    public int mRccId = RemoteControlClient.RCSE_ID_UNREGISTERED;

    public IBinder mToken;

    public String mCallingPackageName;

    public int mCallingUid;

    /**

     * Provides access to the information to display on the remote control.

     * May be null (when a media button event receiver is registered,

     *     but no remote control client has been registered) */

    public IRemoteControlClient mRcClient;

    public RcClientDeathHandler mRcClientDeathHandler;

    /**

     * Information only used for non-local playback

     */

    public int mPlaybackType;

    public int mPlaybackVolume;

    public int mPlaybackVolumeMax;

    public int mPlaybackVolumeHandling;

    public int mPlaybackStream;

    public RccPlaybackState mPlaybackState;

    public IRemoteVolumeObserver mRemoteVolumeObs;

    protected static class RccPlaybackState {

        public int mState;

        public long mPositionMs;

        public float mSpeed;

        public RccPlaybackState(int state, long positionMs, float speed) {

            mState = state;

            mPositionMs = positionMs;

            mSpeed = speed;

        }

        public void reset() {

            mState = RemoteControlClient.PLAYSTATE_STOPPED;

            mPositionMs = RemoteControlClient.PLAYBACK_POSITION_INVALID;

            mSpeed = RemoteControlClient.PLAYBACK_SPEED_1X;

        }

        @Override

        public String toString() {

            return stateToString() + ", " + posToString() + ", " + mSpeed + "X";

        }

        private String posToString() {

            if (mPositionMs == RemoteControlClient.PLAYBACK_POSITION_INVALID) {

                return "PLAYBACK_POSITION_INVALID";

            } else if (mPositionMs == RemoteControlClient.PLAYBACK_POSITION_ALWAYS_UNKNOWN) {

                return "PLAYBACK_POSITION_ALWAYS_UNKNOWN";

            } else {

                return (String.valueOf(mPositionMs) + "ms");

            }

        }

        private String stateToString() {

            switch (mState) {

                case RemoteControlClient.PLAYSTATE_NONE:

                    return "PLAYSTATE_NONE";

                case RemoteControlClient.PLAYSTATE_STOPPED:

                    return "PLAYSTATE_STOPPED";

                case RemoteControlClient.PLAYSTATE_PAUSED:

                    return "PLAYSTATE_PAUSED";

                case RemoteControlClient.PLAYSTATE_PLAYING:

                    return "PLAYSTATE_PLAYING";

                case RemoteControlClient.PLAYSTATE_FAST_FORWARDING:

                    return "PLAYSTATE_FAST_FORWARDING";

                case RemoteControlClient.PLAYSTATE_REWINDING:

                    return "PLAYSTATE_REWINDING";

                case RemoteControlClient.PLAYSTATE_SKIPPING_FORWARDS:

                    return "PLAYSTATE_SKIPPING_FORWARDS";

                case RemoteControlClient.PLAYSTATE_SKIPPING_BACKWARDS:

                    return "PLAYSTATE_SKIPPING_BACKWARDS";

                case RemoteControlClient.PLAYSTATE_BUFFERING:

                    return "PLAYSTATE_BUFFERING";

                case RemoteControlClient.PLAYSTATE_ERROR:

                    return "PLAYSTATE_ERROR";

                default:

                    return "[invalid playstate]";

            }

        }

    }

    void dump(PrintWriter pw) {

        // FIXME to implement, remove dump from MediaFocusControl that accesses private members

    }

    public void resetPlaybackInfo() {

        mPlaybackType = RemoteControlClient.PLAYBACK_TYPE_LOCAL;

        mPlaybackVolume = RemoteControlClient.DEFAULT_PLAYBACK_VOLUME;

        mPlaybackVolumeMax = RemoteControlClient.DEFAULT_PLAYBACK_VOLUME;

        mPlaybackVolumeHandling = RemoteControlClient.DEFAULT_PLAYBACK_VOLUME_HANDLING;

        mPlaybackStream = AudioManager.STREAM_MUSIC;

        mPlaybackState.reset();

        mRemoteVolumeObs = null;

    }

    /** precondition: mediaIntent != null */

    public MediaController(MediaFocusControl controller, PendingIntent mediaIntent,

            ComponentName eventReceiver, IBinder token) {

        mController = controller;

        mMediaIntent = mediaIntent;

        mReceiverComponent = eventReceiver;

        mToken = token;

        mCallingUid = -1;

        mRcClient = null;

        mRccId = ++sLastRccId;

        mPlaybackState = new RccPlaybackState(

                RemoteControlClient.PLAYSTATE_STOPPED,

                RemoteControlClient.PLAYBACK_POSITION_INVALID,

                RemoteControlClient.PLAYBACK_SPEED_1X);

        resetPlaybackInfo();

        if (mToken != null) {

            try {

                mToken.linkToDeath(this, 0);

            } catch (RemoteException e) {

                //FIXME do not access the event handler directly

                mController.mEventHandler.post(new Runnable() {

                    @Override public void run() {

                        mController.unregisterMediaButtonIntent(mMediaIntent);

                    }

                });

            }

        }

    }

    public void unlinkToRcClientDeath() {

        if ((mRcClientDeathHandler != null) && (mRcClientDeathHandler.mCb != null)) {

            try {

                mRcClientDeathHandler.mCb.unlinkToDeath(mRcClientDeathHandler, 0);

                mRcClientDeathHandler = null;

            } catch (java.util.NoSuchElementException e) {

                // not much we can do here

                Log.e(TAG, "Error in unlinkToRcClientDeath()", e);

            }

        }

    }

    // FIXME rename to "release"? (as in FocusRequester class)

    public void destroy() {

        unlinkToRcClientDeath();

        if (mToken != null) {

            mToken.unlinkToDeath(this, 0);

            mToken = null;

        }

    }

    @Override

    public void binderDied() {

        mController.unregisterMediaButtonIntent(mMediaIntent);

    }

    @Override

    protected void finalize() throws Throwable {

        destroy(); // unlink exception handled inside method

        super.finalize();

    }

}