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
207
208
|
/*
* Copyright (C) 2022 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 android.companion.virtual.audio;
import static android.media.AudioRecord.READ_BLOCKING;
import static android.media.AudioRecord.RECORDSTATE_RECORDING;
import static android.media.AudioRecord.RECORDSTATE_STOPPED;
import static android.media.AudioRecord.STATE_INITIALIZED;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.annotation.SuppressLint;
import android.annotation.SystemApi;
import android.media.AudioFormat;
import android.media.AudioRecord;
import android.util.Log;
import com.android.internal.annotations.GuardedBy;
import java.nio.ByteBuffer;
/**
* Wrapper around {@link AudioRecord} that allows for the underlying {@link AudioRecord} to
* be swapped out while recording is ongoing.
*
* @hide
*/
// The stop() actually doesn't release resources, so should not force implementing Closeable.
@SuppressLint("NotCloseable")
@SystemApi
public final class AudioCapture {
private static final String TAG = "AudioCapture";
private final AudioFormat mAudioFormat;
private final Object mLock = new Object();
@GuardedBy("mLock")
@Nullable
private AudioRecord mAudioRecord;
@GuardedBy("mLock")
private int mRecordingState = RECORDSTATE_STOPPED;
/**
* Sets the {@link AudioRecord} to handle audio capturing.
* Callers may call this multiple times with different audio records to change
* the underlying {@link AudioRecord} without stopping and re-starting recording.
*
* @param audioRecord The underlying {@link AudioRecord} to use for capture,
* or null if no audio (i.e. silence) should be captured while still keeping the
* record in a recording state.
*/
void setAudioRecord(@Nullable AudioRecord audioRecord) {
Log.d(TAG, "set AudioRecord with " + audioRecord);
synchronized (mLock) {
// Sync recording state for new reference.
if (audioRecord != null) {
if (audioRecord.getState() != STATE_INITIALIZED) {
throw new IllegalStateException("set an uninitialized AudioRecord.");
}
if (mRecordingState == RECORDSTATE_RECORDING
&& audioRecord.getRecordingState() != RECORDSTATE_RECORDING) {
audioRecord.startRecording();
}
if (mRecordingState == RECORDSTATE_STOPPED
&& audioRecord.getRecordingState() != RECORDSTATE_STOPPED) {
audioRecord.stop();
}
}
// Release old reference before assigning the new reference.
if (mAudioRecord != null) {
mAudioRecord.release();
}
mAudioRecord = audioRecord;
}
}
AudioCapture(@NonNull AudioFormat audioFormat) {
mAudioFormat = audioFormat;
}
void close() {
synchronized (mLock) {
if (mAudioRecord != null) {
mAudioRecord.release();
mAudioRecord = null;
}
}
}
/** See {@link AudioRecord#getFormat()} */
public @NonNull AudioFormat getFormat() {
return mAudioFormat;
}
/** See {@link AudioRecord#read(byte[], int, int)} */
public int read(@NonNull byte[] audioData, int offsetInBytes, int sizeInBytes) {
return read(audioData, offsetInBytes, sizeInBytes, READ_BLOCKING);
}
/** See {@link AudioRecord#read(byte[], int, int, int)} */
public int read(@NonNull byte[] audioData, int offsetInBytes, int sizeInBytes,
@AudioRecord.ReadMode int readMode) {
final int sizeRead;
synchronized (mLock) {
if (mAudioRecord != null) {
sizeRead = mAudioRecord.read(audioData, offsetInBytes, sizeInBytes, readMode);
} else {
sizeRead = 0;
}
}
return sizeRead;
}
/** See {@link AudioRecord#read(ByteBuffer, int)}. */
public int read(@NonNull ByteBuffer audioBuffer, int sizeInBytes) {
return read(audioBuffer, sizeInBytes, READ_BLOCKING);
}
/** See {@link AudioRecord#read(ByteBuffer, int, int)}. */
public int read(@NonNull ByteBuffer audioBuffer, int sizeInBytes,
@AudioRecord.ReadMode int readMode) {
final int sizeRead;
synchronized (mLock) {
if (mAudioRecord != null) {
sizeRead = mAudioRecord.read(audioBuffer, sizeInBytes, readMode);
} else {
sizeRead = 0;
}
}
return sizeRead;
}
/** See {@link AudioRecord#read(float[], int, int, int)}. */
public int read(@NonNull float[] audioData, int offsetInFloats, int sizeInFloats,
@AudioRecord.ReadMode int readMode) {
final int sizeRead;
synchronized (mLock) {
if (mAudioRecord != null) {
sizeRead = mAudioRecord.read(audioData, offsetInFloats, sizeInFloats, readMode);
} else {
sizeRead = 0;
}
}
return sizeRead;
}
/** See {@link AudioRecord#read(short[], int, int)}. */
public int read(@NonNull short[] audioData, int offsetInShorts, int sizeInShorts) {
return read(audioData, offsetInShorts, sizeInShorts, READ_BLOCKING);
}
/** See {@link AudioRecord#read(short[], int, int, int)}. */
public int read(@NonNull short[] audioData, int offsetInShorts, int sizeInShorts,
@AudioRecord.ReadMode int readMode) {
final int sizeRead;
synchronized (mLock) {
if (mAudioRecord != null) {
sizeRead = mAudioRecord.read(audioData, offsetInShorts, sizeInShorts, readMode);
} else {
sizeRead = 0;
}
}
return sizeRead;
}
/** See {@link AudioRecord#startRecording()}. */
public void startRecording() {
synchronized (mLock) {
mRecordingState = RECORDSTATE_RECORDING;
if (mAudioRecord != null && mAudioRecord.getRecordingState() != RECORDSTATE_RECORDING) {
mAudioRecord.startRecording();
}
}
}
/** See {@link AudioRecord#stop()}. */
public void stop() {
synchronized (mLock) {
mRecordingState = RECORDSTATE_STOPPED;
if (mAudioRecord != null && mAudioRecord.getRecordingState() != RECORDSTATE_STOPPED) {
mAudioRecord.stop();
}
}
}
/** See {@link AudioRecord#getRecordingState()}. */
public int getRecordingState() {
synchronized (mLock) {
return mRecordingState;
}
}
}
|
