--- /dev/null
+/*
+ * Copyright 2017 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.moiseum.wolnelektury.view.player.service;
+
+import android.content.Context;
+import android.content.res.AssetFileDescriptor;
+import android.media.MediaPlayer;
+import android.os.Bundle;
+import android.os.Handler;
+import android.os.SystemClock;
+import android.support.v4.media.MediaMetadataCompat;
+import android.support.v4.media.session.PlaybackStateCompat;
+import android.util.Log;
+
+import com.moiseum.wolnelektury.connection.downloads.FileCacheUtils;
+
+/**
+ * Exposes the functionality of the {@link MediaPlayer} and implements the {@link PlayerAdapter}
+ * so that MainActivity can control music playback.
+ */
+public final class MediaPlayerAdapter extends PlayerAdapter {
+
+ private class MediaPlayerException extends Exception {
+
+ private final int what;
+ private final int extra;
+
+ public MediaPlayerException(int what, int extra) {
+ this.what = what;
+ this.extra = extra;
+ }
+
+ @Override
+ public String getMessage() {
+ return "Media player failed with code (" + what + "," + extra + ")";
+ }
+ }
+
+ private static final String TAG = MediaPlayerAdapter.class.getSimpleName();
+ private static final int FIVE_SECONDS = 5000;
+ private static final int CALLBACK_INTERVAL = 400;
+
+ private final Context mContext;
+ private MediaPlayer mMediaPlayer;
+ private String mFilename;
+ private PlaybackInfoListener mPlaybackInfoListener;
+ private MediaMetadataCompat mCurrentMedia;
+ private int mState;
+ private boolean mCurrentMediaPlayedToCompletion;
+
+ private Handler handler = new Handler();
+ private Runnable positionUpdateRunnable = new Runnable() {
+ @Override
+ public void run() {
+ mPlaybackInfoListener.onPlaybackProgress(mMediaPlayer.getCurrentPosition());
+ handler.postDelayed(this, CALLBACK_INTERVAL);
+ }
+ };
+
+ // Work-around for a MediaPlayer bug related to the behavior of MediaPlayer.seekTo()
+ // while not playing.
+ private int mSeekWhileNotPlaying = -1;
+
+ MediaPlayerAdapter(Context context, PlaybackInfoListener listener) {
+ super(context);
+ mContext = context.getApplicationContext();
+ mPlaybackInfoListener = listener;
+ }
+
+ /**
+ * Once the {@link MediaPlayer} is released, it can't be used again, and another one has to be
+ * created. In the onStop() method of the MainActivity the {@link MediaPlayer} is
+ * released. Then in the onStart() of the MainActivity a new {@link MediaPlayer}
+ * object has to be created. That's why this method is private, and called by load(int) and
+ * not the constructor.
+ */
+ private void initializeMediaPlayer() {
+ if (mMediaPlayer == null) {
+ mMediaPlayer = new MediaPlayer();
+ mMediaPlayer.setOnCompletionListener(mediaPlayer -> {
+ mPlaybackInfoListener.onPlaybackCompleted();
+
+ // Set the state to "paused" because it most closely matches the state
+ // in MediaPlayer with regards to available state transitions compared
+ // to "stop".
+ // Paused allows: seekTo(), start(), pause(), stop()
+ // Stop allows: stop()
+ setNewState(PlaybackStateCompat.STATE_PAUSED);
+ });
+ mMediaPlayer.setOnErrorListener((mp, what, extra) -> {
+ Log.e(TAG, "Media player experienced failure: " + what + ", " + extra);
+ setNewState(PlaybackStateCompat.STATE_ERROR);
+ return false;
+ });
+ }
+ }
+
+ // Implements PlaybackControl.
+ @Override
+ public void playFromMedia(MediaMetadataCompat metadata) {
+ mCurrentMedia = metadata;
+ final String mediaId = metadata.getDescription().getMediaId();
+ playFile(AudiobookLibrary.getMusicFilename(mediaId));
+ }
+
+ @Override
+ public MediaMetadataCompat getCurrentMedia() {
+ return mCurrentMedia;
+ }
+
+ private void playFile(String filename) {
+ boolean mediaChanged = (mFilename == null || !filename.equals(mFilename));
+ if (mCurrentMediaPlayedToCompletion) {
+ // Last audio file was played to completion, the resourceId hasn't changed, but the
+ // player was released, so force a reload of the media file for playback.
+ mediaChanged = true;
+ mCurrentMediaPlayedToCompletion = false;
+ }
+ if (!mediaChanged) {
+ if (!isPlaying()) {
+ play();
+ }
+ return;
+ } else {
+ release();
+ }
+
+ mFilename = filename;
+
+ initializeMediaPlayer();
+
+ try {
+ String cachedFileForUrl = FileCacheUtils.getCachedFileForUrl(mFilename);
+ mMediaPlayer.setDataSource(cachedFileForUrl);
+ mMediaPlayer.prepare();
+ mPlaybackInfoListener.onPlaybackPrepared(mMediaPlayer.getDuration());
+ } catch (Exception e) {
+ Log.e(TAG, "Failed to load file: " + mFilename, e);
+ setNewState(PlaybackStateCompat.STATE_ERROR);
+ }
+
+ play();
+ }
+
+ @Override
+ public void onStop() {
+ // Regardless of whether or not the MediaPlayer has been created / started, the state must
+ // be updated, so that MediaNotificationManager can take down the notification.
+ setNewState(PlaybackStateCompat.STATE_STOPPED);
+ release();
+ }
+
+ private void release() {
+ if (mMediaPlayer != null) {
+ handler.removeCallbacks(positionUpdateRunnable);
+ mMediaPlayer.release();
+ mMediaPlayer = null;
+ }
+ }
+
+ @Override
+ public boolean isPlaying() {
+ return mMediaPlayer != null && mMediaPlayer.isPlaying();
+ }
+
+ @Override
+ protected void onPlay() {
+ if (mMediaPlayer != null && !mMediaPlayer.isPlaying()) {
+ mMediaPlayer.start();
+ handler.postDelayed(positionUpdateRunnable, CALLBACK_INTERVAL);
+ setNewState(PlaybackStateCompat.STATE_PLAYING);
+ }
+ }
+
+ @Override
+ protected void onPause() {
+ if (mMediaPlayer != null && mMediaPlayer.isPlaying()) {
+ mMediaPlayer.pause();
+ handler.removeCallbacks(positionUpdateRunnable);
+ setNewState(PlaybackStateCompat.STATE_PAUSED);
+ }
+ }
+
+ // This is the main reducer for the player state machine.
+ private void setNewState(@PlaybackStateCompat.State int newPlayerState) {
+ mState = newPlayerState;
+ if (mState == PlaybackStateCompat.STATE_ERROR) {
+ handler.removeCallbacks(positionUpdateRunnable);
+ mFilename = null;
+ }
+
+ // Whether playback goes to completion, or whether it is stopped, the
+ // mCurrentMediaPlayedToCompletion is set to true.
+ if (mState == PlaybackStateCompat.STATE_STOPPED) {
+ mCurrentMediaPlayedToCompletion = true;
+ }
+
+ // Work around for MediaPlayer.getCurrentPosition() when it changes while not playing.
+ final long reportPosition;
+ if (mSeekWhileNotPlaying >= 0) {
+ reportPosition = mSeekWhileNotPlaying;
+
+ if (mState == PlaybackStateCompat.STATE_PLAYING) {
+ mSeekWhileNotPlaying = -1;
+ }
+ } else {
+ reportPosition = mMediaPlayer == null ? 0 : mMediaPlayer.getCurrentPosition();
+ }
+
+ final PlaybackStateCompat.Builder stateBuilder = new PlaybackStateCompat.Builder();
+ stateBuilder.setActions(getAvailableActions());
+ stateBuilder.setState(mState,
+ reportPosition,
+ 1.0f,
+ SystemClock.elapsedRealtime());
+ if (mState == PlaybackStateCompat.STATE_PLAYING) {
+ Bundle extras = new Bundle();
+ extras.putInt(AudiobookService.EXTRA_PLAYBACK_TOTAL, mMediaPlayer.getDuration());
+ stateBuilder.setExtras(extras);
+ }
+ mPlaybackInfoListener.onPlaybackStateChange(stateBuilder.build());
+ }
+
+ /**
+ * Set the current capabilities available on this session. Note: If a capability is not
+ * listed in the bitmask of capabilities then the MediaSession will not handle it. For
+ * example, if you don't want ACTION_STOP to be handled by the MediaSession, then don't
+ * included it in the bitmask that's returned.
+ */
+ @PlaybackStateCompat.Actions
+ private long getAvailableActions() {
+ long actions = PlaybackStateCompat.ACTION_PLAY_FROM_MEDIA_ID
+ | PlaybackStateCompat.ACTION_PLAY_FROM_SEARCH
+ | PlaybackStateCompat.ACTION_SKIP_TO_NEXT
+ | PlaybackStateCompat.ACTION_SKIP_TO_PREVIOUS;
+ switch (mState) {
+ case PlaybackStateCompat.STATE_STOPPED:
+ actions |= PlaybackStateCompat.ACTION_PLAY
+ | PlaybackStateCompat.ACTION_PAUSE;
+ break;
+ case PlaybackStateCompat.STATE_PLAYING:
+ actions |= PlaybackStateCompat.ACTION_STOP
+ | PlaybackStateCompat.ACTION_PAUSE
+ | PlaybackStateCompat.ACTION_SEEK_TO;
+ break;
+ case PlaybackStateCompat.STATE_PAUSED:
+ actions |= PlaybackStateCompat.ACTION_PLAY
+ | PlaybackStateCompat.ACTION_STOP;
+ break;
+ default:
+ actions |= PlaybackStateCompat.ACTION_PLAY
+ | PlaybackStateCompat.ACTION_PLAY_PAUSE
+ | PlaybackStateCompat.ACTION_STOP
+ | PlaybackStateCompat.ACTION_PAUSE;
+ }
+ return actions;
+ }
+
+ @Override
+ public void seekTo(long position) {
+ if (mMediaPlayer != null) {
+ if (!mMediaPlayer.isPlaying()) {
+ mSeekWhileNotPlaying = (int) position;
+ }
+ mMediaPlayer.seekTo((int) position);
+
+ // Set the state (to the current state) because the position changed and should
+ // be reported to clients.
+ setNewState(mState);
+ }
+ }
+
+ @Override
+ public void fastForward() {
+ if (mMediaPlayer != null) {
+ int seekTo = mMediaPlayer.getCurrentPosition() + FIVE_SECONDS;
+ int newState = mState;
+
+ if (seekTo > mMediaPlayer.getDuration()) {
+ seekTo = mMediaPlayer.getDuration();
+ newState = PlaybackStateCompat.STATE_PAUSED;
+ mMediaPlayer.pause();
+ }
+
+ mMediaPlayer.seekTo(seekTo);
+ setNewState(newState);
+ }
+ }
+
+ @Override
+ public void rewind() {
+ if (mMediaPlayer != null) {
+ int seekTo = mMediaPlayer.getCurrentPosition() - FIVE_SECONDS;
+ int newState = mState;
+
+ if (seekTo < 0) {
+ seekTo = 0;
+ newState = PlaybackStateCompat.STATE_PAUSED;
+ mMediaPlayer.pause();
+ }
+
+ mMediaPlayer.seekTo(seekTo);
+ setNewState(newState);
+ }
+ }
+
+ @Override
+ public void setVolume(float volume) {
+ if (mMediaPlayer != null) {
+ mMediaPlayer.setVolume(volume, volume);
+ }
+ }
+}
fnp / wl-app.git / blobdiff