/**
* starts detecting features/gesture depending on the used extractors.<br>
* Does not record the data for later analysis
*/
public void startDetection() {
final AudioTrack at =
new AudioTrack(
android.media.AudioManager.STREAM_MUSIC,
SAMPLE_RATE,
AudioFormat.CHANNEL_OUT_MONO,
AudioFormat.ENCODING_PCM_16BIT,
minSize,
AudioTrack.MODE_STREAM);
final AudioRecord ar =
new AudioRecord(
MediaRecorder.AudioSource.MIC,
SAMPLE_RATE,
AudioFormat.CHANNEL_IN_MONO,
AudioFormat.ENCODING_PCM_16BIT,
10 * minSize);
final byte[] audio = signalGen.generateAudio();
Thread detectionThread =
new Thread(
new Runnable() {
private int sampleCounter;
@Override
public void run() {
final byte[] buffer = new byte[minSize];
while (detectionRunning) {
int samplesRead = ar.read(buffer, 0, minSize);
if (samplesRead != minSize) {
Log.e(
"AUDIO_MANAGER",
"Samples read not equal minSize ("
+ samplesRead
+ "). Might be loosing data!");
}
// size of bufferDouble is buffer.length/2
final double[] bufferDouble = convertToDouble(buffer, samplesRead);
if (sampleCounter >= 44100) {
if (featureDetector != null) {
featureDetector.checkForFeatures(bufferDouble, true); // false
}
}
// omit first second
sampleCounter += samplesRead;
}
ar.stop();
ar.release();
}
});
Thread playThread =
new Thread(
new Runnable() {
@Override
public void run() {
at.play();
while (detectionRunning) {
at.write(audio, 0, audio.length);
}
at.stop();
at.release();
}
});
ar.startRecording();
detectionRunning = true;
detectionThread.start();
playThread.start();
}
/**
* starts recording the received audio. Also saves it to a file for later analysis
*
* @throws FileNotFoundException
*/
public void startRecord() throws FileNotFoundException {
final AudioTrack at =
new AudioTrack(
android.media.AudioManager.STREAM_MUSIC,
SAMPLE_RATE,
AudioFormat.CHANNEL_OUT_MONO,
AudioFormat.ENCODING_PCM_16BIT,
minSize,
AudioTrack.MODE_STREAM);
final AudioRecord ar =
new AudioRecord(
MediaRecorder.AudioSource.MIC,
SAMPLE_RATE,
AudioFormat.CHANNEL_IN_MONO,
AudioFormat.ENCODING_PCM_16BIT,
10 * minSize);
tempFileRec = new File(ctx.getExternalCacheDir().getAbsolutePath() + "/temp_rec.raw");
tempFileSend = new File(ctx.getExternalCacheDir().getAbsolutePath() + "/temp_send.raw");
if (tempFileRec.exists()) tempFileRec.delete();
if (tempFileSend.exists()) tempFileSend.delete();
dosRec = new DataOutputStream(new FileOutputStream(tempFileRec));
dosSend = new DataOutputStream(new FileOutputStream(tempFileSend));
final byte[] audio = signalGen.generateAudio();
Thread recordThread =
new Thread(
new Runnable() {
private int sampleCounter;
@Override
public void run() {
final byte[] buffer = new byte[minSize];
while (recordRunning) {
int samplesRead = ar.read(buffer, 0, minSize);
if (samplesRead != minSize) {
Log.e(
"AUDIO_MANAGER",
"Samples read not equal minSize ("
+ samplesRead
+ "). Might be loosing data!");
}
// TODO: consider seperate thread (in case of buffer overflow)
writeByteBufferToStream(buffer, dosRec);
// size of bufferDouble is buffer.length/2
final double[] bufferDouble = convertToDouble(buffer, samplesRead);
if (sampleCounter >= 44100) {
if (featureDetector != null) {
featureDetector.checkForFeatures(bufferDouble, true); // false
}
}
// omit first second
sampleCounter += samplesRead;
}
ar.stop();
ar.release();
try {
dosRec.close();
} catch (IOException e) {
e.printStackTrace();
}
}
});
Thread playThread =
new Thread(
new Runnable() {
@Override
public void run() {
at.play();
while (recordRunning) {
at.write(audio, 0, audio.length);
writeByteBufferToStream(audio, dosSend);
}
at.stop();
at.release();
}
});
ar.startRecording();
recordRunning = true;
recordThread.start();
playThread.start();
}
