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/*
* Copyright (C) 2014 The CyanogenMod 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 org.lineageos.eleven.utils;
import android.media.MediaPlayer;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.Message;
import android.util.Log;
import java.io.File;
import java.util.ArrayList;
/**
* Class that helps signal when srt text comes and goes
*/
public abstract class SrtManager implements Handler.Callback {
private static final String TAG = SrtManager.class.getSimpleName();
private static final boolean DEBUG = false;
private static final int POST_TEXT_MSG = 0;
private ArrayList<SrtParser.SrtEntry> mEntries;
private Handler mHandler;
private HandlerThread mHandlerThread;
private Runnable mLoader;
private MediaPlayer mMediaPlayer;
private int mNextIndex;
public SrtManager() {
mHandlerThread = new HandlerThread("SrtManager",
android.os.Process.THREAD_PRIORITY_FOREGROUND);
mHandlerThread.start();
mHandler = new Handler(mHandlerThread.getLooper(), this);
}
public synchronized void reset() {
mHandler.removeMessages(POST_TEXT_MSG);
mHandler.removeCallbacks(mLoader);
mEntries = null;
mLoader = null;
mMediaPlayer = null;
mNextIndex = -1;
// post a null timed text to clear
onTimedText(null);
}
public synchronized void release() {
if (mHandlerThread != null) {
mHandler.removeMessages(POST_TEXT_MSG);
mHandler.removeCallbacks(mLoader);
mHandler = null;
mHandlerThread.quit();
mHandlerThread = null;
}
}
public synchronized void initialize(final MediaPlayer player, final File f) {
if (player == null || f == null) {
throw new IllegalArgumentException("Must have a valid player and file");
}
reset();
if (!f.exists()) {
return;
}
mMediaPlayer = player;
mLoader = new Runnable() {
@Override
public void run() {
onLoaded(this, SrtParser.getSrtEntries(f));
}
};
mHandler.post(mLoader);
}
public synchronized void seekTo(long timeMs) {
mHandler.removeMessages(POST_TEXT_MSG);
mNextIndex = 0;
if (mEntries != null) {
if (DEBUG) {
Log.d(TAG, "Seeking to: " + timeMs);
}
// find the first entry after the current time and set mNextIndex to the one before that
for (int i = 0; i < mEntries.size(); i++) {
mNextIndex = i;
if (i + 1 < mEntries.size() && mEntries.get(i + 1).mStartTimeMs > timeMs) {
break;
}
}
postNextTimedText();
}
}
public synchronized void pause() {
mHandler.removeMessages(POST_TEXT_MSG);
}
public synchronized void play() {
postNextTimedText();
}
private synchronized void onLoaded(Runnable r, ArrayList<SrtParser.SrtEntry> entries) {
// if this is the same loader
if (r == mLoader) {
mEntries = entries;
if (mEntries != null) {
if (DEBUG) {
Log.d(TAG, "Loaded: " + entries.size() + " number of entries");
}
try {
seekTo(mMediaPlayer.getCurrentPosition());
} catch(IllegalStateException e) {
Log.d(TAG, "illegal state but failing silently");
reset();
}
}
}
}
private synchronized void postNextTimedText() {
if (mEntries != null) {
long timeMs = 0;
try {
timeMs = mMediaPlayer.getCurrentPosition();
} catch (IllegalStateException e) {
Log.d(TAG, "illegal state - probably because media player has been " +
"stopped/released. failing silently");
return;
}
String currentMessage = null;
long targetTime = -1;
// shift mNextIndex until it hits the next item we want
while (mNextIndex < mEntries.size() && mEntries.get(mNextIndex).mStartTimeMs < timeMs) {
mNextIndex++;
}
// if the previous entry is valid, set the message and target time
if (mNextIndex > 0 && entrySurroundsTime(mEntries.get(mNextIndex - 1), timeMs)) {
currentMessage = mEntries.get(mNextIndex - 1).mLine;
targetTime = mEntries.get(mNextIndex - 1).mEndTimeMs;
}
onTimedText(currentMessage);
// if our next index is valid, and we don't have a target time, set it
if (mNextIndex < mEntries.size() && targetTime == -1) {
targetTime = mEntries.get(mNextIndex).mStartTimeMs;
}
// if we have a targeted time entry and we are playing, then queue up a delayed message
if (targetTime >= 0 && mMediaPlayer.isPlaying()) {
mHandler.removeMessages(POST_TEXT_MSG);
long delay = targetTime - timeMs;
mHandler.sendEmptyMessageDelayed(POST_TEXT_MSG, delay);
if (DEBUG && mNextIndex < mEntries.size()) {
Log.d(TAG, "Preparing next message: " + delay + "ms from now with msg: " +
mEntries.get(mNextIndex).mLine);
}
}
}
}
@Override
public boolean handleMessage(Message msg) {
switch (msg.what) {
case POST_TEXT_MSG:
postNextTimedText();
return true;
}
return false;
}
private static boolean entrySurroundsTime(SrtParser.SrtEntry entry, long time) {
return entry.mStartTimeMs <= time && entry.mEndTimeMs >= time;
}
public abstract void onTimedText(String txt);
}
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