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/*
* Copyright (C) 2013 Andrew Comminos
*
* 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.morlunk.jumble.audio;
import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioTrack;
import android.os.Handler;
import android.os.Looper;
import android.os.Process;
import android.os.RemoteException;
import android.util.Log;
import com.morlunk.jumble.Constants;
import com.morlunk.jumble.IJumbleObserver;
import com.morlunk.jumble.JumbleService;
import com.morlunk.jumble.model.User;
import com.morlunk.jumble.net.JumbleMessageHandler;
import com.morlunk.jumble.net.JumbleUDPMessageType;
import com.morlunk.jumble.net.PacketDataStream;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
/**
* Created by andrew on 16/07/13.
*/
public class AudioOutput extends JumbleMessageHandler.Stub implements Runnable, AudioOutputSpeech.TalkStateListener {
/** Number of nanoseconds until sleeping audio output thread. */
private static final long SLEEP_THRESHOLD = 2000000000L;
private JumbleService mService;
private ConcurrentHashMap<Integer, AudioOutputSpeech> mAudioOutputs = new ConcurrentHashMap<Integer, AudioOutputSpeech>();
private AudioTrack mAudioTrack;
private Thread mThread;
private Object mInactiveLock = new Object(); // Lock that the audio thread waits on when there's no audio to play. Wake when we get a frame.
private boolean mRunning = false;
private long mLastPacket; // Time that the last packet was received, in nanoseconds
public AudioOutput(JumbleService service) {
mService = service;
int bufferSize = AudioTrack.getMinBufferSize(Audio.SAMPLE_RATE, AudioFormat.CHANNEL_OUT_MONO, AudioFormat.ENCODING_PCM_16BIT) * 2;
mAudioTrack = new AudioTrack(AudioManager.STREAM_MUSIC,
Audio.SAMPLE_RATE,
AudioFormat.CHANNEL_OUT_MONO,
AudioFormat.ENCODING_PCM_16BIT,
Audio.FRAME_SIZE*12,
AudioTrack.MODE_STREAM);
}
public void startPlaying() {
if(mRunning)
return;
mThread = new Thread(this);
mThread.start();
}
public void stopPlaying() {
mRunning = false;
mThread = null;
for(AudioOutputSpeech s : mAudioOutputs.values())
s.destroy();
}
@Override
public void run() {
Log.v(Constants.TAG, "Started audio output thread.");
android.os.Process.setThreadPriority(Process.THREAD_PRIORITY_URGENT_AUDIO);
mRunning = true;
mAudioTrack.play();
final short[] mix = new short[Audio.FRAME_SIZE*12];
while(mRunning) {
Arrays.fill(mix, (short)0);
boolean play = mix(mix, mix.length);
if(play) {
mAudioTrack.write(mix, 0, mix.length);
} else if(System.nanoTime()-mLastPacket > SLEEP_THRESHOLD) {
Log.v(Constants.TAG, "Pausing audio output thread.");
synchronized (mInactiveLock) {
try {
mInactiveLock.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
Log.v(Constants.TAG, "Resuming audio output thread.");
}
}
mAudioTrack.flush();
mAudioTrack.stop();
}
private boolean mix(short[] outBuffer, int bufferSize) {
List<AudioOutputSpeech> mix = new ArrayList<AudioOutputSpeech>();
List<AudioOutputSpeech> del = new ArrayList<AudioOutputSpeech>();
// TODO add priority speaker support
for(AudioOutputSpeech speech : mAudioOutputs.values()) {
if(!speech.needSamples(bufferSize))
del.add(speech);
else
mix.add(speech);
}
if(!mix.isEmpty()) {
for(AudioOutputSpeech speech : mix) {
float[] buffer = speech.getBuffer();
for(int i = 0; i < bufferSize; i++) {
short pcm = (short) (buffer[i]*Short.MAX_VALUE); // Convert float to short
pcm = (short) Math.max(Math.min(pcm, Short.MAX_VALUE), Short.MIN_VALUE); // Clip audio
outBuffer[i] += pcm;
}
}
}
for(AudioOutputSpeech speech : del)
mAudioOutputs.remove(speech.getSession());
return !mix.isEmpty();
}
@Override
public void messageVoiceData(byte[] data) {
if(!mRunning)
return;
JumbleUDPMessageType dataType = JumbleUDPMessageType.values()[data[0] >> 5 & 0x7];
int msgFlags = data[0] & 0x1f;
byte[] voiceData = new byte[data.length-1];
System.arraycopy(data, 1, voiceData, 0, voiceData.length);
PacketDataStream pds = new PacketDataStream(voiceData, voiceData.length);
int session = (int) pds.readLong();
User user = mService.getUserHandler().getUser(session);
if(user != null && !user.isLocalMuted()) {
// TODO check for whispers here
int seq = (int) pds.readLong();
ByteBuffer packet = ByteBuffer.allocate(pds.left() + 1);
packet.put((byte)msgFlags);
packet.put(pds.dataBlock(pds.left()));
AudioOutputSpeech aop = mAudioOutputs.get(session);
if(aop != null && aop.getCodec() != dataType) {
aop.destroy();
aop = null;
}
if(aop == null) {
aop = new AudioOutputSpeech(session, dataType, this);
mAudioOutputs.put(session, aop);
}
aop.addFrameToBuffer(packet.array(), seq);
mLastPacket = System.nanoTime();
synchronized (mInactiveLock) {
mInactiveLock.notify();
}
}
}
@Override
public void onTalkStateUpdated(int session, User.TalkState state) {
final User user = mService.getUserHandler().getUser(session);
if(user.getTalkState() != state) {
user.setTalkState(state);
Handler handler = new Handler(Looper.getMainLooper());
handler.post(new Runnable() {
@Override
public void run() {
mService.notifyObservers(new JumbleService.ObserverRunnable() {
@Override
public void run(IJumbleObserver observer) throws RemoteException {
observer.onUserTalkStateUpdated(user);
}
});;
}
});
}
}
}
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