// data from mic
protected short[] effectIn(short[] in) {
double energy = 0;
for (int i = 0; i < in.length; i++) {
in[i] = (short) (in[i] * _gain);
energy = energy + (Math.abs(in[i]));
}
_inEnergy = energy / in.length;
return in;
}
protected synchronized boolean initMic(int sampleRate, int bytesPerFrame) {
boolean isOK = true;
if (_mic == null) {
// Will this work? In the emulator only 8k works!
int micBufferSizeBytes =
AudioRecord.getMinBufferSize(
sampleRate, AudioFormat.CHANNEL_IN_MONO, AndroidAudio.ENCODING_FORMAT);
Log.debug(
this.getClass().getSimpleName()
+ ".init(): minMicBufferSizeBytes (1)="
+ micBufferSizeBytes);
if (micBufferSizeBytes < bytesPerFrame) {
micBufferSizeBytes = bytesPerFrame;
}
int mdeep = 2 + (micBufferSizeBytes / bytesPerFrame);
mdeep = Math.max(mdeep, 4);
int recBuffSizeBytes = bytesPerFrame * mdeep;
_micFramebuff = new short[bytesPerFrame / 2];
Log.info(
this.getClass().getSimpleName()
+ ".initMic(): sampleRate="
+ sampleRate
+ ", bytesPerFrame="
+ bytesPerFrame
+ ", recBuffsz="
+ recBuffSizeBytes
+ ", ");
try {
/*
* make sure you add to AndroidManifest.xml:
*
* <uses-permission
* android:name="android.permission.RECORD_AUDIO"/>
*/
/*
* TODO, only read now that
* 44100Hz is currently the only rate that is guaranteed to work on all devices!
* I set it to 8000K!
* Need to check this!
*/
// try and take advantage of an echo can if there is one.
int micdevice = (android.os.Build.VERSION.SDK_INT >= 11) ? 7 : AudioSource.MIC;
_mic =
new AudioRecord(
micdevice,
sampleRate,
AudioFormat.CHANNEL_IN_MONO,
AndroidAudio.ENCODING_FORMAT,
recBuffSizeBytes);
if (_mic.getState() != AudioRecord.STATE_INITIALIZED) {
isOK = false;
}
} catch (Throwable exc) {
Log.error(exc.toString());
isOK = false;
}
}
return isOK;
}