Android(Java)和Matlab读取Wav文件中的数据。它有何不同?
我正在尝试录制一个wav文件,并在android中读取和保存一个wav文件的数据。除了在Matlab中读取的值与在android中保存的数据之间的差异外,一切正常 这是我的密码Android(Java)和Matlab读取Wav文件中的数据。它有何不同?,java,android,matlab,wav,audio-processing,Java,Android,Matlab,Wav,Audio Processing,我正在尝试录制一个wav文件,并在android中读取和保存一个wav文件的数据。除了在Matlab中读取的值与在android中保存的数据之间的差异外,一切正常 这是我的密码 private static final int RECORDER_BPP = 16; private static final String AUDIO_RECORDER_FILE_EXT_WAV = ".wav"; private static final String AUDIO
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";
private static final int RECORDER_SAMPLERATE = 44100;
private static final int RECORDER_CHANNELS = AudioFormat.CHANNEL_IN_MONO;
private static final int RECORDER_AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT;
private AudioRecord recorder = null;
private int bufferSize = 0;
private Thread recordingThread = null;
private boolean isRecording = false;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
setButtonHandlers();
enableButtons(false);
bufferSize = AudioRecord.getMinBufferSize(RECORDER_SAMPLERATE, RECORDER_CHANNELS, RECORDER_AUDIO_ENCODING);
}
private void setButtonHandlers() {
((Button) findViewById(R.id.btnStart)).setOnClickListener(btnClick);
((Button) findViewById(R.id.btnStop)).setOnClickListener(btnClick);
}
private void enableButton(int id, boolean isEnable) {
((Button) findViewById(id)).setEnabled(isEnable);
}
private void enableButtons(boolean isRecording) {
enableButton(R.id.btnStart, !isRecording);
enableButton(R.id.btnStop, isRecording);
}
private String getFilename() {
String filepath = Environment.getExternalStorageDirectory().getPath();
File file = new File(filepath, AUDIO_RECORDER_FOLDER);
if ( !file.exists()) {
file.mkdirs();
}
return (file.getAbsolutePath() + "/" + 11 + 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 String getfftFilename() {
String filepath = Environment.getExternalStorageDirectory().getPath();
File file = new File(filepath, AUDIO_RECORDER_FOLDER);
if ( !file.exists()) {
file.mkdirs();
}
return (file.getAbsolutePath() + "/" + "fft" + ".txt");
}
private void startRecording() {
recorder = new AudioRecord(MediaRecorder.AudioSource.MIC,
RECORDER_SAMPLERATE, RECORDER_CHANNELS, RECORDER_AUDIO_ENCODING, bufferSize);
recorder.startRecording();
isRecording = true;
recordingThread = new Thread(new Runnable() {
@Override
public void run() {
writeAudioDataToFile();
}
}, "AudioRecorder Thread");
recordingThread.start();
}
private void writeAudioDataToFile() {
byte data[] = new byte[bufferSize];
String filename = getTempFilename();
FileOutputStream os = null;
try {
os = new FileOutputStream(filename);
}
catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
int read = 0;
if (null != os) {
while (isRecording) {
read = recorder.read(data, 0, bufferSize);
if (AudioRecord.ERROR_INVALID_OPERATION != read) {
try {
os.write(data);
}
catch (IOException e) {
e.printStackTrace();
}
}
}
}
try {
os.close();
}
catch (IOException e) {
e.printStackTrace();
}
}
private void stopRecording() {
if (null != recorder) {
isRecording = false;
recorder.stop();
recorder.release();
recorder = null;
recordingThread = null;
}
copyWaveFile(getTempFilename(), getFilename());
////coding(getTempFilename(), getrainroom(), getstegan());
////decoding(getstegan(), getdecodeFilename(), getrainroom());
fftbegir(getTempFilename(), getfftFilename());
deleteTempFile();
}
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 = totalAudioLen + 36;
long longSampleRate = RECORDER_SAMPLERATE;
int channels = 1;
long byteRate = RECORDER_BPP * RECORDER_SAMPLERATE * channels / 8;
byte[] data = new byte[bufferSize];
try {
in = new FileInputStream(inFilename);
out = new FileOutputStream(outFilename);
totalAudioLen = in.getChannel().size();
totalDataLen = totalAudioLen + 36;
AppLog.logString("File size: " + totalDataLen);
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 fftbegir(String input, String output) {
FileInputStream in5 = null;
FileOutputStream out5 = null;
FileOutputStream stream = null;
byte[] data7 = new byte[10000];
double[] data8;
long totalAudioLen = 0;
long totalDataLen = totalAudioLen + 36;
long longSampleRate = RECORDER_SAMPLERATE;
int channels = 1;
int i = 0;
int r, k, l;
double b;
int m = 2;
long byteRate = RECORDER_BPP * RECORDER_SAMPLERATE * channels / 8;
String filepath = Environment.getExternalStorageDirectory().getPath();
File tempFile = new File(filepath, AUDIO_RECORDER_TEMP_FILE);
try {
in5 = new FileInputStream(input);
out5 = new FileOutputStream(output);
String strI = "nxkxaprojext;)";
out5.write(strI.getBytes());
AppLog.logString("File size: " + totalDataLen);
totalAudioLen = in5.getChannel().size();
strI = Long.toString(totalAudioLen);
out5.write(strI.getBytes());
out5.write(" ".getBytes());
data8 = SoundDataUtils.load16BitPCMRawDataFileAsDoubleArray();
l = data8.length;
strI = Integer.toString(l);
out5.write(strI.getBytes());
out5.write(" ".getBytes());
while (l > m) {
m = m * 2;
}
strI = Integer.toString(m);
out5.write(strI.getBytes());
out5.write(" ".getBytes());
strI = Double.toString(data8[50]);
out5.write(strI.getBytes());
Complex[] x = new Complex[m];
while (i < l) {
strI = Double.toString(data8[i]);
out5.write(strI.getBytes());
out5.write(" ".getBytes());
//x[i] = new Complex(data8[i], 0);
i++;
}
in5.close();
///i--;
///for (i = l; i < m; i++) {
/// x[i] = new Complex(0, 0);
/// }
/// FFT f = new FFT();
//// Complex[] y = f.fft(x);
/*try {
for (i = 0; i < m; i++) {
b = y[i].re();
strI = Double.toString(b);
out5.write(strI.getBytes());
out5.write(" ".getBytes());
b = y[i].im();
strI = Double.toString(b);
out5.write(strI.getBytes());
out5.write("j".getBytes());
out5.write(" ".getBytes());
}
}*/// finally {
/// out5.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) (1 * 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);
}
private View.OnClickListener btnClick = new View.OnClickListener() {
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btnStart: {
AppLog.logString("Start Recording");
enableButtons(true);
startRecording();
break;
}
case R.id.btnStop: {
AppLog.logString("Start Recording");
enableButtons(false);
stopRecording();
break;
}
}
}
};
private static final int RECORDER_BPP=16;
专用静态最终字符串音频\u记录器\u文件\u EXT\u WAV=“.WAV”;
专用静态最终字符串音频\u记录器\u文件夹=“音频记录器”;
专用静态最终字符串音频\u记录器\u TEMP\u FILE=“录制\u TEMP.raw”;
专用静态最终积分记录仪\u采样器=44100;
专用静态最终整数记录器\u通道=单声道中的AudioFormat.CHANNEL\u;
专用静态最终整数记录器\u音频\u编码=AudioFormat.ENCODING\u PCM\u 16位;
专用录音机=空;
私有int bufferSize=0;
私有线程recordingThread=null;
私有布尔值isRecording=false;
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
setButtonHandlers();
启用按钮(错误);
bufferSize=AudioRecord.getMinBufferSize(记录器采样器、记录器通道、记录器音频编码);
}
私有void setButtonHandlers(){
((按钮)findviewbyd(R.id.btnStart)).setOnClickListener(btnClick);
((按钮)findviewbyd(R.id.btnStop)).setOnClickListener(btnClick);
}
私有void enableButton(int-id,boolean-isEnable){
((按钮)findViewById(id)).setEnabled(isEnable);
}
专用void启用按钮(布尔值isRecording){
启用按钮(R.id.btnStart,!isRecording);
启用按钮(R.id.btnStop,isRecording);
}
私有字符串getFilename(){
字符串filepath=Environment.getExternalStorageDirectory().getPath();
文件=新文件(文件路径、音频\u录制器\u文件夹);
如果(!file.exists()){
mkdirs()文件;
}
返回(file.getAbsolutePath()+“/”+11+音频\u记录器\u文件\u外部\u WAV);
}
私有字符串getTempFilename(){
字符串filepath=Environment.getExternalStorageDirectory().getPath();
文件=新文件(文件路径、音频\u录制器\u文件夹);
如果(!file.exists()){
mkdirs()文件;
}
File tempFile=新文件(文件路径、音频记录器临时文件);
if(tempFile.exists())
tempFile.delete();
返回(file.getAbsolutePath()+“/”+音频记录器临时文件);
}
私有字符串getfftFilename(){
字符串filepath=Environment.getExternalStorageDirectory().getPath();
文件=新文件(文件路径、音频\u录制器\u文件夹);
如果(!file.exists()){
mkdirs()文件;
}
返回(file.getAbsolutePath()+“/”+“fft”+“.txt”);
}
私有无效开始记录(){
录音机=新的录音机(MediaRecorder.AudioSource.MIC,
录像机采样器、录像机通道、录像机音频编码、缓冲区大小);
记录器。开始记录();
isRecording=true;
recordingThread=新线程(new Runnable()){
@凌驾
公开募捐{
WriteeAudioDataToFile();
}
}“录音机线程”);
recordingThread.start();
}
私有void writeeAudioDataToFile(){
字节数据[]=新字节[bufferSize];
字符串文件名=getTempFilename();
FileOutputStream os=null;
试一试{
os=新文件输出流(文件名);
}
catch(filenotfounde异常){
//TODO自动生成的捕捉块
e、 printStackTrace();
}
int read=0;
如果(null!=os){
while(isRecording){
读取=记录器。读取(数据,0,缓冲区大小);
if(AudioRecord.ERROR\u无效\u操作!=读取){
试一试{
写(数据);
}
捕获(IOE异常){
e、 printStackTrace();
}
}
}
}
试一试{
os.close();
}
捕获(IOE异常){
e、 printStackTrace();
}
}
私有void stopRecording(){
如果(空!=记录器){
isRecording=false;
录音机。停止();
记录器。释放();
记录器=空;
recordingThread=null;
}
copyWaveFile(getTempFilename(),getFilename());
////编码(getTempFilename(),getrainroom(),getstegan());
////解码(getstegan(),getdecodeFilename(),getrainroom());
fftbegir(getTempFilename(),getfftFilename());
deleteTempFile();
}
私有void deleteTempFile(){
File File=新文件(getTempFilename());
delete();
}
私有void copyWaveFile(字符串填充名、字符串输出名){
FileInputStream in=null;
FileOutputStream out=null;
长总听力=0;
long totalDataLen=totalAudioLen+36;
long longSampleRate=记录仪和采样器;
int通道=1;
long byteRate=记录器\ BPP*记录器\采样器*通道/8;
字节[]数据=新字节[bufferSize];
试一试{
in=新文件输入流(inFilename);
out=新文件输出流(outFilename);
totalAudioLen=in.getChannel().size();
totalDataLen=totalAudioLen+36;
logString(“文件大小:“+totalDataLen”);
WriteWaveFileHeader(输出、totalAudioLen、totalDataLen、,
长安培拉、通道、byteRate);
while(in.read(数据)!=-1){
输出。写入(数据);
}
in.close();
out.close();
}
catch(filenotfounde异常){
e、 printStackTrace();
}
捕获(IOE异常){
e、 printStackTrace();
}
}
私有void fftbegir(字符串输入、字符串输出){
FileInputStream in5=null;
FileOutputStream out5=null;
FileOutputStream=null;
字节[]数据7=新字节[10000];
双[]数据8;
长总听力=0;
long totalDataLen=totalAudioLen+36;
long longSampleRate=记录仪和采样器;
int通道=1;
public static double[] load16BitPCMRawDataFileAsDoubleArray() throws IOException {
String filepath = Environment.getExternalStorageDirectory().getPath();
File file = new File(filepath, "AudioRecorder");
if ( !file.exists()) {
file.mkdirs();
}
File tempFile = new File(filepath + "/AudioRecorder", "record_temp.raw");
InputStream in = null;
long size = tempFile.length();
try {
in = new FileInputStream(tempFile);
return readStreamAsDoubleArray(in, size);
}
catch (Exception e) {}
return null;
}
public static double[] readStreamAsDoubleArray(InputStream in, long size)
throws IOException {
int bufferSize = (int) (size / 2);
double[] result = new double[bufferSize];
DataInputStream is = new DataInputStream(in);
for (int i = 0; i < bufferSize; i++) {
result[i] = is.readShort() / 32768.0;
}
return result;
}