blob: a211058b3a91bc5c9dc0950ba457d8c41956d369 (
plain)
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
|
/*
* Copyright (C) 2015 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.android.messaging.ui.mediapicker;
import com.google.common.base.Preconditions;
import javax.annotation.concurrent.ThreadSafe;
/**
* Keeps track of the speech level as last observed by the recognition
* engine as microphone data flows through it. Can be polled by the UI to
* animate its views.
*/
@ThreadSafe
public class AudioLevelSource {
private volatile int mSpeechLevel;
private volatile Listener mListener;
public static final int LEVEL_UNKNOWN = -1;
public interface Listener {
void onSpeechLevel(int speechLevel);
}
public void setSpeechLevel(int speechLevel) {
Preconditions.checkArgument(speechLevel >= 0 && speechLevel <= 100 ||
speechLevel == LEVEL_UNKNOWN);
mSpeechLevel = speechLevel;
maybeNotify();
}
public int getSpeechLevel() {
return mSpeechLevel;
}
public void reset() {
setSpeechLevel(LEVEL_UNKNOWN);
}
public boolean isValid() {
return mSpeechLevel > 0;
}
private void maybeNotify() {
final Listener l = mListener;
if (l != null) {
l.onSpeechLevel(mSpeechLevel);
}
}
public synchronized void setListener(Listener listener) {
mListener = listener;
}
public synchronized void clearListener(Listener listener) {
if (mListener == listener) {
mListener = null;
}
}
}
|