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annotate android/src/org/libsdl/app/SDLAudioManager.java @ 1839:78abbabfd58d

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Get Android build working again and update for SDL 2.0.7 (last version to support older versions of Android)
author Michael Pavone <pavone@retrodev.com>
date Sun, 14 Apr 2019 23:37:11 -0700
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1 package org.libsdl.app;
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2
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3 import android.media.*;
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4 import android.util.Log;
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5
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6 public class SDLAudioManager
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7 {
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8 protected static final String TAG = "SDLAudio";
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9
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10 protected static AudioTrack mAudioTrack;
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11 protected static AudioRecord mAudioRecord;
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12
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13 public static void initialize() {
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14 mAudioTrack = null;
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15 mAudioRecord = null;
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16 }
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17
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18 // Audio
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19
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20 /**
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21 * This method is called by SDL using JNI.
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22 */
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23 public static int audioOpen(int sampleRate, boolean is16Bit, boolean isStereo, int desiredFrames) {
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24 int channelConfig = isStereo ? AudioFormat.CHANNEL_CONFIGURATION_STEREO : AudioFormat.CHANNEL_CONFIGURATION_MONO;
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25 int audioFormat = is16Bit ? AudioFormat.ENCODING_PCM_16BIT : AudioFormat.ENCODING_PCM_8BIT;
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26 int frameSize = (isStereo ? 2 : 1) * (is16Bit ? 2 : 1);
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27
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28 Log.v(TAG, "SDL audio: wanted " + (isStereo ? "stereo" : "mono") + " " + (is16Bit ? "16-bit" : "8-bit") + " " + (sampleRate / 1000f) + "kHz, " + desiredFrames + " frames buffer");
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29
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30 // Let the user pick a larger buffer if they really want -- but ye
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31 // gods they probably shouldn't, the minimums are horrifyingly high
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32 // latency already
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33 desiredFrames = Math.max(desiredFrames, (AudioTrack.getMinBufferSize(sampleRate, channelConfig, audioFormat) + frameSize - 1) / frameSize);
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34
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35 if (mAudioTrack == null) {
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36 mAudioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, sampleRate,
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37 channelConfig, audioFormat, desiredFrames * frameSize, AudioTrack.MODE_STREAM);
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38
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39 // Instantiating AudioTrack can "succeed" without an exception and the track may still be invalid
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40 // Ref: https://android.googlesource.com/platform/frameworks/base/+/refs/heads/master/media/java/android/media/AudioTrack.java
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41 // Ref: http://developer.android.com/reference/android/media/AudioTrack.html#getState()
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42
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43 if (mAudioTrack.getState() != AudioTrack.STATE_INITIALIZED) {
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44 Log.e(TAG, "Failed during initialization of Audio Track");
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45 mAudioTrack = null;
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46 return -1;
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47 }
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48
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49 mAudioTrack.play();
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50 }
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51
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52 Log.v(TAG, "SDL audio: got " + ((mAudioTrack.getChannelCount() >= 2) ? "stereo" : "mono") + " " + ((mAudioTrack.getAudioFormat() == AudioFormat.ENCODING_PCM_16BIT) ? "16-bit" : "8-bit") + " " + (mAudioTrack.getSampleRate() / 1000f) + "kHz, " + desiredFrames + " frames buffer");
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53
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54 return 0;
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55 }
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56
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57 /**
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58 * This method is called by SDL using JNI.
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59 */
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60 public static void audioWriteShortBuffer(short[] buffer) {
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61 if (mAudioTrack == null) {
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62 Log.e(TAG, "Attempted to make audio call with uninitialized audio!");
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63 return;
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64 }
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65
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66 for (int i = 0; i < buffer.length; ) {
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67 int result = mAudioTrack.write(buffer, i, buffer.length - i);
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68 if (result > 0) {
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69 i += result;
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70 } else if (result == 0) {
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71 try {
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72 Thread.sleep(1);
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73 } catch(InterruptedException e) {
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74 // Nom nom
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75 }
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76 } else {
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77 Log.w(TAG, "SDL audio: error return from write(short)");
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78 return;
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79 }
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80 }
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81 }
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82
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83 /**
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84 * This method is called by SDL using JNI.
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85 */
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86 public static void audioWriteByteBuffer(byte[] buffer) {
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87 if (mAudioTrack == null) {
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88 Log.e(TAG, "Attempted to make audio call with uninitialized audio!");
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89 return;
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90 }
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91
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92 for (int i = 0; i < buffer.length; ) {
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93 int result = mAudioTrack.write(buffer, i, buffer.length - i);
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94 if (result > 0) {
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95 i += result;
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96 } else if (result == 0) {
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97 try {
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98 Thread.sleep(1);
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99 } catch(InterruptedException e) {
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100 // Nom nom
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101 }
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102 } else {
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103 Log.w(TAG, "SDL audio: error return from write(byte)");
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104 return;
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105 }
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106 }
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107 }
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108
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109 /**
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110 * This method is called by SDL using JNI.
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111 */
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112 public static int captureOpen(int sampleRate, boolean is16Bit, boolean isStereo, int desiredFrames) {
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113 int channelConfig = isStereo ? AudioFormat.CHANNEL_CONFIGURATION_STEREO : AudioFormat.CHANNEL_CONFIGURATION_MONO;
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114 int audioFormat = is16Bit ? AudioFormat.ENCODING_PCM_16BIT : AudioFormat.ENCODING_PCM_8BIT;
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115 int frameSize = (isStereo ? 2 : 1) * (is16Bit ? 2 : 1);
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116
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117 Log.v(TAG, "SDL capture: wanted " + (isStereo ? "stereo" : "mono") + " " + (is16Bit ? "16-bit" : "8-bit") + " " + (sampleRate / 1000f) + "kHz, " + desiredFrames + " frames buffer");
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118
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119 // Let the user pick a larger buffer if they really want -- but ye
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120 // gods they probably shouldn't, the minimums are horrifyingly high
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121 // latency already
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122 desiredFrames = Math.max(desiredFrames, (AudioRecord.getMinBufferSize(sampleRate, channelConfig, audioFormat) + frameSize - 1) / frameSize);
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123
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124 if (mAudioRecord == null) {
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125 mAudioRecord = new AudioRecord(MediaRecorder.AudioSource.DEFAULT, sampleRate,
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126 channelConfig, audioFormat, desiredFrames * frameSize);
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127
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128 // see notes about AudioTrack state in audioOpen(), above. Probably also applies here.
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129 if (mAudioRecord.getState() != AudioRecord.STATE_INITIALIZED) {
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130 Log.e(TAG, "Failed during initialization of AudioRecord");
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131 mAudioRecord.release();
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132 mAudioRecord = null;
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133 return -1;
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134 }
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135
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136 mAudioRecord.startRecording();
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137 }
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138
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139 Log.v(TAG, "SDL capture: got " + ((mAudioRecord.getChannelCount() >= 2) ? "stereo" : "mono") + " " + ((mAudioRecord.getAudioFormat() == AudioFormat.ENCODING_PCM_16BIT) ? "16-bit" : "8-bit") + " " + (mAudioRecord.getSampleRate() / 1000f) + "kHz, " + desiredFrames + " frames buffer");
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140
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141 return 0;
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142 }
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143
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144 /** This method is called by SDL using JNI. */
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145 public static int captureReadShortBuffer(short[] buffer, boolean blocking) {
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146 // !!! FIXME: this is available in API Level 23. Until then, we always block. :(
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147 //return mAudioRecord.read(buffer, 0, buffer.length, blocking ? AudioRecord.READ_BLOCKING : AudioRecord.READ_NON_BLOCKING);
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148 return mAudioRecord.read(buffer, 0, buffer.length);
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149 }
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150
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151 /** This method is called by SDL using JNI. */
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152 public static int captureReadByteBuffer(byte[] buffer, boolean blocking) {
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153 // !!! FIXME: this is available in API Level 23. Until then, we always block. :(
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154 //return mAudioRecord.read(buffer, 0, buffer.length, blocking ? AudioRecord.READ_BLOCKING : AudioRecord.READ_NON_BLOCKING);
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155 return mAudioRecord.read(buffer, 0, buffer.length);
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156 }
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157
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158
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159 /** This method is called by SDL using JNI. */
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160 public static void audioClose() {
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161 if (mAudioTrack != null) {
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162 mAudioTrack.stop();
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163 mAudioTrack.release();
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164 mAudioTrack = null;
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165 }
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166 }
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167
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168 /** This method is called by SDL using JNI. */
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169 public static void captureClose() {
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170 if (mAudioRecord != null) {
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171 mAudioRecord.stop();
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172 mAudioRecord.release();
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173 mAudioRecord = null;
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174 }
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175 }
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176
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177 public static native int nativeSetupJNI();
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178 }