解释来自wav文件的原始数据

本文介绍了解释来自wav文件的原始数据的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

此代码旨在记录音频，将音频保存到wav文件中，并打印原始音频数据.当我运行代码时，它每次都打印一个不同的字符串，如下所示:[B @ 431b2168 我的问题:我是否可以正确地从wav文件中提取音频数据，如果是，那这串数字是什么意思? 这是代码:

This code is designed to record audio, save that audio into a wav file, and println the raw audio data. When I run the code, it prints a different string each time that looks like this: [B@431b2168 My question: Am I extracting the audio data from the wav file correctly and if so, what does that string of numbers mean? Here is the code:

package com.example.wesle.noisemachine; import android.content.Intent; import android.media.AudioFormat; import android.media.AudioManager; import android.media.AudioRecord; import android.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.*; /* import javax.sound.sampled.AudioFormat; import javax.sound.sampled.AudioInputStream; import javax.sound.sampled.AudioSystem; import javax.sound.sampled.UnsupportedAudioFileException; */ 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; //byte[] payload; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_receive_screen); filePath = getFilename(); final File wavfile = new File(filePath); //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]; //payload = new byte [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); 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(); System.out.println(audioBytes); } 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); //payload[] = payload + 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; } } }

推荐答案

您到达那里的是数组的内存地址. 您应该遍历数组并打印每个字节. 您可以这样操作:

What youre getting there is the Memory address of the array. You should iterate over the array and print each byte. you could do it this way:

for(int i = 0;i<audioBytes.length;i++){ System.out.println(audioBytes[i]); }