NewPipe/app/src/main/java/org/schabi/newpipe/BackgroundPlayer.java

package org.schabi.newpipe;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.net.wifi.WifiManager;
import android.os.IBinder;
import android.os.PowerManager;
import android.support.v7.app.NotificationCompat;
import android.util.Log;
import android.widget.Toast;

import java.io.IOException;

/**
 * Created by Adam Howard on 08/11/15.
 *
 * Copyright (c) Adam Howard <achdisposable1@gmail.com> 2015
 *
 * BackgroundPlayer.java is part of NewPipe.
 *
 * NewPipe is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * NewPipe is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with NewPipe.  If not, see <http://www.gnu.org/licenses/>.
 */

/**Plays the audio stream of videos in the background. */
public class BackgroundPlayer extends Service /*implements MediaPlayer.OnPreparedListener*/ {

    private static final String TAG = BackgroundPlayer.class.toString();
    //private Looper mServiceLooper;
    //private ServiceHandler mServiceHandler;

    public BackgroundPlayer() {
        super();
    }

    @Override
    public void onCreate() {
        super.onCreate();
    }
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Toast.makeText(this, "Playing in background", Toast.LENGTH_SHORT).show();//todo:translation string

        String source = intent.getDataString();
        String videoTitle = intent.getStringExtra("title");

        PlayerThread player = new PlayerThread(source, videoTitle, this);
        player.start();

        // If we get killed after returning here, don't restart
        return START_NOT_STICKY;
    }

    @Override
    public IBinder onBind(Intent intent) {
        // We don't provide binding (yet?), so return null
        return null;
    }

    @Override
    public void onDestroy() {
        //Toast.makeText(this, "service done", Toast.LENGTH_SHORT).show();
    }

    private class PlayerThread extends Thread {
        private MediaPlayer mediaPlayer;
        private String source;
        private String title;
        private BackgroundPlayer owner;
        public PlayerThread(String src, String title, BackgroundPlayer owner) {
            this.source = src;
            this.title = title;
            this.owner = owner;
            mediaPlayer = new MediaPlayer();
            mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
        }
        @Override
        public void run() {
            mediaPlayer.setWakeMode(getApplicationContext(), PowerManager.PARTIAL_WAKE_LOCK);//cpu lock
            try {
                mediaPlayer.setDataSource(source);
                mediaPlayer.prepare(); //We are already in a separate worker thread,
                //so calling the blocking prepare() method should be ok

                //alternatively:
                //mediaPlayer.setOnPreparedListener(this);
                //mediaPlayer.prepareAsync(); //prepare async to not block main thread
            } catch (IOException ioe) {
                ioe.printStackTrace();
                Log.e(TAG, "video source:" + source);
                Log.e(TAG, "video title:" + title);
                //can't do anything useful without a file to play; exit early
                return;
            }

            WifiManager wifiMgr = ((WifiManager)getSystemService(Context.WIFI_SERVICE));
            WifiManager.WifiLock wifiLock = wifiMgr.createWifiLock(WifiManager.WIFI_MODE_FULL, TAG);

            mediaPlayer.setOnCompletionListener(new EndListener(wifiLock));//listen for end of video

            //get audio focus
            /*
            AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
            int result = audioManager.requestAudioFocus(this, AudioManager.STREAM_MUSIC,
                    AudioManager.AUDIOFOCUS_GAIN);

            if (result != AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
                // could not get audio focus.
            }*/
            wifiLock.acquire();
            mediaPlayer.start();

            //mediaPlayer.getCurrentPosition()
            int vidLength = mediaPlayer.getDuration();
    //todo: make it so that tapping the notification brings you back to the Video's DetailActivity
            NotificationCompat.Builder noteBuilder = new NotificationCompat.Builder(owner);
            noteBuilder
                    .setPriority(Notification.PRIORITY_LOW)
                    .setCategory(Notification.CATEGORY_TRANSPORT)
                    .setContentTitle(title)
                    .setContentText("NewPipe is playing in the background")//todo: translation string
                    .setOngoing(true)
                    .setProgress(vidLength, 0, false)
                    .setSmallIcon(R.mipmap.ic_launcher);

            int noteID = TAG.hashCode();
            startForeground(noteID, noteBuilder.build());
            NotificationManager noteMgr = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
            //update every 3s or 4 times in the video, whichever is shorter
            int sleepTime = Math.min(3000, (int)((double)vidLength/4));
            while(mediaPlayer.isPlaying()) {
                try {
                    Thread.sleep(sleepTime);
                } catch (InterruptedException e) {
                    Log.d(TAG, "sleep failure");
                }
                noteBuilder.setProgress(vidLength, mediaPlayer.getCurrentPosition(), false);
                noteMgr.notify(noteID, noteBuilder.build());
            }
            noteBuilder.setProgress(0, 0, false);//remove bar
            noteMgr.cancel(noteID);
        }
    }
/*
    private class ListenerThread extends Thread implements AudioManager.OnAudioFocusChangeListener {
        @Override
        public void onAudioFocusChange(int focusChange) {

        }
    }*/


    private class EndListener implements MediaPlayer.OnCompletionListener {
        private WifiManager.WifiLock wl;
        public EndListener(WifiManager.WifiLock wifiLock) {
            this.wl = wifiLock;
        }

        @Override
        public void onCompletion(MediaPlayer mp) {
            wl.release();//release wifilock
            stopForeground(true);//remove ongoing notification
            stopSelf();
            mp.release();
            //todo:release cpu lock
        }
    }
}