从android上的wav文件中读取原始数据
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【中文标题】从android上的wav文件中读取原始数据【英文标题】：reading raw data from a wav file on android 【发布时间】：2017-06-24 12:56:33 【问题描述】：因此，此代码将音频记录到存储在模拟存储中的 wav 文件中。那么如何获取这个 wav 文件并获取原始音频数据的数组？
代码将在 buttonDecode 部分中显示： //从wav文件中读取原始数据
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 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;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_receive_screen);
//final MediaPlayer wavRecording = MediaPlayer.create(this, "/storage/emulated/0");
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);
//outputFile = Environment.getExternalStorageDirectory().getAbsolutePath() + "/recording.3gp";
//System.out.println(outputFile);
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;
filePath = getFilename();
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();
//play code
File wavfile = new File(filePath);
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);
//read raw data from wav file
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 class SoundPoolPlayer
private SoundPool mShortPlayer= null;
private HashMap mSounds = new HashMap();
public SoundPoolPlayer(Context pContext)
// setup Soundpool
this.mShortPlayer = new SoundPool(4, AudioManager.STREAM_MUSIC, 0);
mSounds.put(R.raw.<sound_1_name>, this.mShortPlayer.load(pContext, R.raw.<sound_1_name>, 1));
mSounds.put(R.raw.<sound_2_name>, this.mShortPlayer.load(pContext, R.raw.<sound_2_name>, 1));
public void playShortResource(int piResource)
int iSoundId = (Integer) mSounds.get(piResource);
this.mShortPlayer.play(iSoundId, 0.99f, 0.99f, 0, 0, 1);
// Cleanup
public void release()
// Cleanup
this.mShortPlayer.release();
this.mShortPlayer = null;
*/
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;
// Remark: In Java, we should really override the hashcode function
// whenever we override the equals function. But, I don't want to
// get into this for a light introduction to programming in java.
// Hash codes are necessary for various of Java's collections. See HashSet for instance.
// The following was generated by Netbeans.
@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;
【问题讨论】：
【参考方案1】：这应该可以。 可能有更好的方法来连接输入流等中的字节，但这是一个需要改进的工作示例。希望它有效。我使用 AudioTrack 而不是 MediaPlayer。希望这对你有用。
InputStream is = mContext.getResources().openRawResource(R.raw.bell);
byte []musicBytes=new byte[512];
byte []fullMusicBytes=new byte[512];
byte []tempMusicBytes=new byte[512];
try
while (is.available() > 0)
is.read(musicBytes);
if(fullMusicBytes!=null)
tempMusicBytes = new byte[fullMusicBytes.length + musicBytes.length];
System.arraycopy(fullMusicBytes, 0, tempMusicBytes, 0, fullMusicBytes.length);
System.arraycopy(musicBytes, 0, tempMusicBytes, fullMusicBytes.length, musicBytes.length);
fullMusicBytes=tempMusicBytes;
else
fullMusicBytes=musicBytes;
is.close();
catch(Exception e)
int buffsize = AudioTrack.getMinBufferSize(sr,
AudioFormat.CHANNEL_OUT_STEREO, AudioFormat.ENCODING_PCM_16BIT);
// create an audiotrack object
AudioTrack audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC,
sr, AudioFormat.CHANNEL_OUT_STEREO,
AudioFormat.ENCODING_PCM_16BIT, buffsize,
AudioTrack.MODE_STREAM);
audioTrack.play();
int buffNr=0;
while(fullMusicBytes.length>=buffNr)
audioTrack.write(fullMusicBytes, buffNr, buffsize);
buffNr+=buffsize;
【讨论】：
我相信是的，我是 Java 新手，所以我不太了解，我可以用 byte[] 进行信号处理吗？ 字节数组是波形文件中的声音字节，可以逐字节处理。在立体声中，数组中的每一秒字节都是右边的，另一个是左边的，或者相反，不记得了。 wav 文件的字节数组以一些字节的头信息（采样率、立体声/单声道等）开始。其余的都很好 那么如何将原始数据提取到 byte[] 数组中？ 这个问题的第一个答案显示了如何将 WAV 文件转换为字节数组。 ***.com/questions/10397272/… 对不起，那是 java。我不知道它在 Android 中是否同样有效。我一会儿回来。我有一个旧项目，我用过 wav，但我不记得了，打开它看看以上是关于从android上的wav文件中读取原始数据的主要内容，如果未能解决你的问题，请参考以下文章
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