1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
|
/*
* 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);
}
});;
}
});
}
}
}
|