我正在尝试检测用户何时完成与麦克风的交谈。我正在使用以下代码。
package airtel.in.sentencedetection;
import android.media.AudioFormat;
import android.media.AudioRecord;
import android.media.MediaRecorder;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.text.TextUtils;
import android.util.Log;
import android.view.Menu;
import android.widget.Toast;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
public class MainActivity extends AppCompatActivity {
private static final String TAG = MainActivity.class.getSimpleName();
private static final int RECORDER_BPP = 16;
private static final String AUDIO_RECORDER_FILE_EXT_WAV = ".wav";
private static final String AUDIO_RECORDER_FOLDER = "AudioRecorder";
private static final String AUDIO_RECORDER_TEMP_FILE = "record_temp.raw";
FileOutputStream os = null;
int bufferSize ;
int frequency = 44100; //8000;
int channelConfiguration = AudioFormat.CHANNEL_IN_MONO;
int audioEncoding = AudioFormat.ENCODING_PCM_16BIT;
boolean started = false;
RecordAudio recordTask;
short threshold=15000;
boolean debug=false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
startAquisition();
}
@Override
protected void onResume() {
Log.w(TAG, "onResume");
super.onResume();
}
@Override
protected void onDestroy() {
Log.w(TAG, "onDestroy");
stopAquisition();
super.onDestroy();
}
public class RecordAudio extends AsyncTask<Void, Double, Void> {
@Override
protected Void doInBackground(Void... arg0) {
Log.w(TAG, "doInBackground");
try {
String filename = getTempFilename();
try {
os = new FileOutputStream(filename);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
bufferSize = AudioRecord.getMinBufferSize(frequency,
channelConfiguration, audioEncoding);
AudioRecord audioRecord = new AudioRecord( MediaRecorder.AudioSource.MIC, frequency,
channelConfiguration, audioEncoding, bufferSize);
short[] buffer = new short[bufferSize];
audioRecord.startRecording();
while (started) {
int bufferReadResult = audioRecord.read(buffer, 0,bufferSize);
if(AudioRecord.ERROR_INVALID_OPERATION != bufferReadResult){
//check signal
//put a threshold
int foundPeak=searchThreshold(buffer,threshold);
if (foundPeak>-1){ //found signal
//record signal
byte[] byteBuffer =ShortToByte(buffer,bufferReadResult);
try {
os.write(byteBuffer);
} catch (IOException e) {
e.printStackTrace();
}
}else{//count the time
//don't save signal
}
//show results
//here, with publichProgress function, if you calculate the total saved samples,
//you can optionally show the recorded file length in seconds: publishProgress(elsapsedTime,0);
}
}
audioRecord.stop();
//close file
try {
os.close();
} catch (IOException e) {
e.printStackTrace();
}
copyWaveFile(getTempFilename(),getFilename());
deleteTempFile();
} catch (Throwable t) {
t.printStackTrace();
Log.e("AudioRecord", "Recording Failed");
}
return null;
} //fine di doInBackground
byte [] ShortToByte(short [] input, int elements) {
int short_index, byte_index;
int iterations = elements; //input.length;
byte [] buffer = new byte[iterations * 2];
short_index = byte_index = 0;
for(/*NOP*/; short_index != iterations; /*NOP*/)
{
buffer[byte_index] = (byte) (input[short_index] & 0x00FF);
buffer[byte_index + 1] = (byte) ((input[short_index] & 0xFF00) >> 8);
++short_index; byte_index += 2;
}
return buffer;
}
int searchThreshold(short[]arr,short thr){
int peakIndex;
int arrLen=arr.length;
for (peakIndex=0;peakIndex<arrLen;peakIndex++){
if ((arr[peakIndex]>=thr) || (arr[peakIndex]<=-thr)){
//se supera la soglia, esci e ritorna peakindex-mezzo kernel.
return peakIndex;
}
}
return -1; //not found
}
/*
@Override
protected void onProgressUpdate(Double... values) {
DecimalFormat sf = new DecimalFormat("000.0000");
elapsedTimeTxt.setText(sf.format(values[0]));
}
*/
private String getFilename(){
String filepath = Environment.getExternalStorageDirectory().getPath();
File file = new File(filepath,AUDIO_RECORDER_FOLDER);
if(!file.exists()){
file.mkdirs();
}
return (file.getAbsolutePath() + "/" + System.currentTimeMillis() + AUDIO_RECORDER_FILE_EXT_WAV);
}
private String getTempFilename(){
String filepath = Environment.getExternalStorageDirectory().getPath();
File file = new File(filepath,AUDIO_RECORDER_FOLDER);
if(!file.exists()){
file.mkdirs();
}
File tempFile = new File(filepath,AUDIO_RECORDER_TEMP_FILE);
if(tempFile.exists())
tempFile.delete();
return (file.getAbsolutePath() + "/" + AUDIO_RECORDER_TEMP_FILE);
}
private void deleteTempFile() {
File file = new File(getTempFilename());
file.delete();
}
private void copyWaveFile(String inFilename,String outFilename){
FileInputStream in = null;
FileOutputStream out = null;
long totalAudioLen = 0;
long totalDataLen;
long longSampleRate = frequency;
int channels = 1;
long byteRate = RECORDER_BPP * frequency * channels/8;
byte[] data = new byte[bufferSize];
try {
in = new FileInputStream(inFilename);
Toast.makeText(getApplicationContext(), String.valueOf(in.getChannel().size()), Toast.LENGTH_LONG).show();
File file = new File(inFilename);
out = new FileOutputStream(outFilename);
totalAudioLen = file.length();//Long.parseLong(String.valueOf(file.length()/1024));
//in.getChannel().size();
totalDataLen = totalAudioLen + 36;
WriteWaveFileHeader(out, totalAudioLen, totalDataLen,
longSampleRate, channels, byteRate);
while(in.read(data) != -1){
out.write(data);
}
in.close();
out.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
private void WriteWaveFileHeader(
FileOutputStream out, long totalAudioLen,
long totalDataLen, long longSampleRate, int channels,
long byteRate) throws IOException {
byte[] header = new byte[44];
header[0] = 'R'; // RIFF/WAVE header
header[1] = 'I';
header[2] = 'F';
header[3] = 'F';
header[4] = (byte) (totalDataLen & 0xff);
header[5] = (byte) ((totalDataLen >> 8) & 0xff);
header[6] = (byte) ((totalDataLen >> 16) & 0xff);
header[7] = (byte) ((totalDataLen >> 24) & 0xff);
header[8] = 'W';
header[9] = 'A';
header[10] = 'V';
header[11] = 'E';
header[12] = 'f'; // 'fmt ' chunk
header[13] = 'm';
header[14] = 't';
header[15] = ' ';
header[16] = 16; // 4 bytes: size of 'fmt ' chunk
header[17] = 0;
header[18] = 0;
header[19] = 0;
header[20] = 1; // format = 1
header[21] = 0;
header[22] = (byte) channels;
header[23] = 0;
header[24] = (byte) (longSampleRate & 0xff);
header[25] = (byte) ((longSampleRate >> 8) & 0xff);
header[26] = (byte) ((longSampleRate >> 16) & 0xff);
header[27] = (byte) ((longSampleRate >> 24) & 0xff);
header[28] = (byte) (byteRate & 0xff);
header[29] = (byte) ((byteRate >> 8) & 0xff);
header[30] = (byte) ((byteRate >> 16) & 0xff);
header[31] = (byte) ((byteRate >> 24) & 0xff);
header[32] = (byte) (channels * 16 / 8); // block align
header[33] = 0;
header[34] = RECORDER_BPP; // bits per sample
header[35] = 0;
header[36] = 'd';
header[37] = 'a';
header[38] = 't';
header[39] = 'a';
header[40] = (byte) (totalAudioLen & 0xff);
header[41] = (byte) ((totalAudioLen >> 8) & 0xff);
header[42] = (byte) ((totalAudioLen >> 16) & 0xff);
header[43] = (byte) ((totalAudioLen >> 24) & 0xff);
out.write(header, 0, 44);
}
} //Fine Classe RecordAudio (AsyncTask)
@Override
public boolean onCreateOptionsMenu(Menu menu) {
//getMenuInflater().inflate(R.menu.test_audio_capture_with_threshold, menu);
return true;
}
public void resetAquisition() {
Log.w(TAG, "resetAquisition");
stopAquisition();
//startButton.setText("WAIT");
startAquisition();
}
public void stopAquisition() {
Log.w(TAG, "stopAquisition");
if (started) {
started = false;
recordTask.cancel(true);
}
}
public void startAquisition(){
Log.w(TAG, "startAquisition");
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
public void run() {
//elapsedTime=0;
started = true;
recordTask = new RecordAudio();
recordTask.execute();
//startButton.setText("RESET");
}
}, 500);
}
}
我收到一个错误：
我尝试读取java.nio.channels.ClosedByInterruptException in.getChannel（）。size（）放入totalAudioLen;
我尝试搜索对此的解释，但不存在。我还使用了file.length()而不是in.getChannel.size()，但是它给出了错误的文件。
对此有任何帮助吗？