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下面的代码记录，播放和“解码”了一个wav文件。当我绘制从该文件的字节数组，它看起来像这样：为什么字节数组形成的wav文件看起来不像音频波形
记录是我说“测试”，这应该是这样的：
不任何人都知道为什么wav文件中字节数组的图形看起来不像真正的audiodata？
这里是整个活动的代码：
package com.example.wesle.noisemachine;
import android.content.Intent;
import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioRecord;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.os.Environment;
import android.widget.Toast;
import com.jjoe64.graphview.GraphView;
import com.jjoe64.graphview.series.DataPoint;
import com.jjoe64.graphview.series.LineGraphSeries;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.*;
public class ReceiveScreen extends AppCompatActivity {
private Button buttonStart, buttonStop, buttonDecode, buttonPlay;
private String filePath;
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_STEREO;
private static final int RECORDER_AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT;
short[] audioData;
private AudioRecord recorder = null;
private int bufferSize = 0;
private Thread recordingThread = null;
private boolean isRecording = false;
Complex[] fftTempArray;
Complex[] fftArray;
int[] bufferData;
int bytesRecorded;
LineGraphSeries<DataPoint> series;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_receive_screen);
filePath = getFilename();
final File wavfile = new File(filePath);
buttonStart = (Button) findViewById(R.id.buttonStart);
buttonStop = (Button) findViewById(R.id.buttonStop);
buttonPlay = (Button) findViewById(R.id.buttonPlay);
buttonDecode = (Button) findViewById(R.id.buttonDecode);
buttonStop.setEnabled(false);
buttonDecode.setEnabled(false);
buttonPlay.setEnabled(false);
bufferSize = AudioRecord.getMinBufferSize
(RECORDER_SAMPLERATE,RECORDER_CHANNELS,RECORDER_AUDIO_ENCODING)*3;
audioData = new short [bufferSize];
buttonStart.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
buttonStart.setEnabled(false);
buttonDecode.setEnabled(false);
buttonPlay.setEnabled(false);
recorder = new AudioRecord(MediaRecorder.AudioSource.MIC,
RECORDER_SAMPLERATE,
RECORDER_CHANNELS,
RECORDER_AUDIO_ENCODING,
bufferSize);
int i = recorder.getState();
if (i==1)
recorder.startRecording();
isRecording = true;
recordingThread = new Thread(new Runnable() {
@Override
public void run() {
writeAudioDataToFile();
}
}, "AudioRecorder Thread");
recordingThread.start();
buttonStop.setEnabled(true);
Toast.makeText(getApplicationContext(), "Recording started", Toast.LENGTH_LONG).show();
}
});
buttonStop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
buttonStop.setEnabled(false);
if (null != recorder){
isRecording = false;
int i = recorder.getState();
if (i==1)
recorder.stop();
recorder.release();
recorder = null;
recordingThread = null;
}
copyWaveFile(getTempFilename(),filePath);
deleteTempFile();
Toast.makeText(getApplicationContext(), "Recording Completed", Toast.LENGTH_LONG).show();
buttonStart.setEnabled(true);
buttonPlay.setEnabled(true);
buttonDecode.setEnabled(true);
}
});
buttonPlay.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
buttonStart.setEnabled(false);
buttonDecode.setEnabled(false);
buttonPlay.setEnabled(false);
Toast.makeText(getApplicationContext(), "Recording Playing", Toast.LENGTH_LONG).show();
Uri myUri1 = Uri.fromFile(wavfile);
final MediaPlayer mPlayer = new MediaPlayer();
mPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
try {
mPlayer.setDataSource(getApplicationContext(), myUri1);
} catch (IllegalArgumentException e) {
Toast.makeText(getApplicationContext(), "You might not set the URI correctly!", Toast.LENGTH_LONG).show();
} catch (SecurityException e) {
Toast.makeText(getApplicationContext(), "You might not set the URI correctly!", Toast.LENGTH_LONG).show();
} catch (IllegalStateException e) {
Toast.makeText(getApplicationContext(), "You might not set the URI correctly!", Toast.LENGTH_LONG).show();
} catch (IOException e) {
e.printStackTrace();
}
try {
mPlayer.prepare();
} catch (IllegalStateException e) {
Toast.makeText(getApplicationContext(), "You might not set the URI correctly!", Toast.LENGTH_LONG).show();
} catch (IOException e) {
Toast.makeText(getApplicationContext(), "You might not set the URI correctly!", Toast.LENGTH_LONG).show();
}
mPlayer.start();
buttonStart.setEnabled(true);
buttonDecode.setEnabled(true);
buttonPlay.setEnabled(true);
}
});
buttonDecode.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
buttonStart.setEnabled(false);
buttonDecode.setEnabled(false);
buttonPlay.setEnabled(false);
GraphView thegraph = (GraphView) findViewById(R.id.thegraph);
series = new LineGraphSeries<DataPoint>();
double x,y;
x = 0;
try {
ByteArrayOutputStream outt = new ByteArrayOutputStream();
BufferedInputStream in = new BufferedInputStream(new FileInputStream(wavfile));
int read;
byte[] buff = new byte[1024];
while ((read = in.read(buff)) > 0)
{
outt.write(buff, 0, read);
}
outt.flush();
byte[] audioBytes = outt.toByteArray();
//int[][] graphData = getUnscaledAmplitude(audioBytes, 1);
for(int i = 0; i < audioBytes.length;i++){
//System.out.println(audioBytes[i]);
byte curByte = audioBytes[i];
//int curByte = graphData[0][i];
y = (curByte);
series.appendData(new DataPoint(x,y), true, audioBytes.length);
x = x + 1;
//x = x + (1/RECORDER_SAMPLERATE);
}
thegraph.addSeries(series);
} catch (IOException e) {
e.printStackTrace();
}
buttonStart.setEnabled(true);
buttonDecode.setEnabled(true);
buttonPlay.setEnabled(true);
}
});
//Code for the back button
Button backbuttonR = (Button) findViewById(R.id.backbuttonR);
backbuttonR.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
startActivity(new Intent(ReceiveScreen.this, MainActivity.class));
}
});
}
private String getFilename(){
String filepath = Environment.getExternalStorageDirectory().getPath();
File file = new File(filepath,AUDIO_RECORDER_FOLDER);
System.out.println(file.getAbsolutePath() + "/" + System.currentTimeMillis() + AUDIO_RECORDER_FILE_EXT_WAV);
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 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 (read > 0){
}
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 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 = 2;
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;
System.out.println("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 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) (2 * 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);
}
public static final class Complex {
// The number stored is x+I*y.
final private double x, y;
// I don't want to allow anyone to access these numbers so I've labeled
// them private.
/** Construct a point from real and imaginary parts. */
public Complex(double real_part, double imaginary_part) {
x=real_part;
y=imaginary_part;
}
/** Construct a real number. */
public Complex(double real_part) {
x=real_part;
y=0;
}
// A static constructor.
/** Construct a complex number from the given polar coordinates. */
public static Complex fromPolar(double r, double theta) {
return new Complex(r*Math.cos(theta), r*Math.sin(theta));
}
// Basic operations on Complex numbers.
/** Return the real part. */
public double re(){
return x;
}
/** Return the imaginary part. */
public double im(){
return y;
}
/** Return the complex conjugate */
public Complex conj() {
return new Complex(x,-y);
}
/** Return the square of the absolute value. */
public double absSquared() {
return x*x+y*y;
}
/** Return the absolute value. */
public double abs() {
// The java.lang.Math package contains many useful mathematical functions,
// including the square root function.
return Math.sqrt(absSquared());
}
// ARITHMETIC
/** Add a complex number to this one.
*
* @param z The complex number to be added.
* @return A new complex number which is the sum.
*/
public Complex add(Complex z) {
return new Complex(x+z.x, y+z.y);
}
/** Subtract a complex number from this one.
*
* @param z The complex number to be subtracted.
* @return A new complex number which is the sum.
*/
public Complex minus(Complex z) {
return new Complex(x-z.x, y-z.y);
}
/** Negate this complex number.
*
* @return The negation.
*/
public Complex neg() {
return new Complex(-x, -y);
}
/** Compute the product of two complex numbers
*
* @param z The complex number to be multiplied.
* @return A new complex number which is the product.
*/
public Complex mult(Complex z) {
return new Complex(x*z.x-y*z.y, x*z.y+z.x*y);
}
/** Divide this complex number by a real number.
*
* @param q The number to divide by.
* @return A new complex number representing the quotient.
*/
public Complex div(double q) {
return new Complex(x/q,y/q);
}
/** Return the multiplicative inverse. */
public Complex inv() {
// find the square of the absolute value of this complex number.
double abs_squared=absSquared();
return new Complex(x/abs_squared, -y/abs_squared);
}
/** Compute the quotient of two complex numbers.
*
* @param z The complex number to divide this one by.
* @return A new complex number which is the quotient.
*/
public Complex div(Complex z) {
return mult(z.inv());
}
/** Return the complex exponential of this complex number. */
public Complex exp() {
return new Complex(Math.exp(x)*Math.cos(y),Math.exp(x)*Math.sin(y));
}
// FUNCTIONS WHICH KEEP JAVA HAPPY:
/** Returns this point as a string.
* The main purpose of this function is for printing the string out,
* so we return a string in a (fairly) human readable format.
*/
// The _optional_ override directive "@Override" below just says we are
// overriding a function defined in a parent class. In this case, the
// parent is java.lang.Object. All classes in Java have the Object class
// as a superclass.
@Override
public String toString() {
// Comments:
// 1) "" represents the empty string.
// 2) If you add something to a string, it converts the thing you
// are adding to a string, and then concatentates it with the string.
// We do some voodoo to make sure the number is displayed reasonably.
if (y==0) {
return ""+x;
}
if (y>0) {
return ""+x+"+"+y+"*I";
}
// otherwise y<0.
return ""+x+"-"+(-y)+"*I";
}
/** Return true if the object is a complex number which is equal to this complex number. */
@Override
public boolean equals(Object obj) {
// Return false if the object is null
if (obj == null) {
return false;
}
// Return false if the object is not a Complex number
if (!(obj instanceof Complex)) {
return false;
}
// Now the object must be a Complex number, so we can convert it to a
// Complex number.
Complex other = (Complex) obj;
// If the x-coordinates are not equal, then return false.
if (x != other.x) {
return false;
}
// If the y-coordinates are not equal, then return false.
if (y != other.y) {
return false;
}
// Both parts are equal, so return true.
return true;
}
@Override
public int hashCode() {
int hash = 3;
hash = 83 * hash + (int) (Double.doubleToLongBits(this.x)^(Double.doubleToLongBits(this.x) >>> 32));
hash = 83 * hash + (int) (Double.doubleToLongBits(this.y)^(Double.doubleToLongBits(this.y) >>> 32));
return hash;
}
}
public int[][] getUnscaledAmplitude(byte[] eightBitByteArray, int nbChannels)
{
int[][] toReturn = new int[nbChannels][eightBitByteArray.length/(2 * nbChannels)];
int index = 0;
for (int audioByte = 0; audioByte < eightBitByteArray.length;)
{
for (int channel = 0; channel < nbChannels; channel++)
{
// Do the byte to sample conversion.
int low = (int) eightBitByteArray[audioByte];
audioByte++;
int high = (int) eightBitByteArray[audioByte];
audioByte++;
int sample = (high << 8) + (low & 0x00ff);
toReturn[channel][index] = sample;
if (audioByte == 0) {
System.out.println("CHANNEL COUNT");
}
}
index++;
}
return toReturn;
}
}
这是16位和立体声。所以你实际上需要两个图形，每个图形每16位构成一个值，而不是每个字节的值。 –
你知道我可以如何将字节数组传送到16位值数组吗？ –
那么你可以手动做到这一点，创建一个合适大小的“short”，并将每一对字节转换为“short”（然后记住轴承立体声）。毫无疑问，这些问题已经存在。如果你可以使用nio，那么ByteBuffer和ShortBuffer可能会帮助你。 –