Android 使用AudioRecord录音相关和音频文件的封装

在Android中录音可以用MediaRecord录音,操作比较简单。但是不够专业,就是不能对音频进行处理。如果要进行音频的实时的处理或者音频的一些封装

就可以用AudioRecord来进行录音了。

这里给出一段代码。实现了AudioRecord的录音和WAV格式音频的封装。

用AudioTrack和AudioTrack类可以进行边录边播,可以参考:http://blog.sina.com.cn/s/blog_6309e1ed0100j1rw.html

我们这里的代码没有播放。但是有封装和详解,如下:

package com.ppmeet;  
  
import java.io.File;  
import java.io.FileInputStream;  
import java.io.FileNotFoundException;  
import java.io.FileOutputStream;  
import java.io.IOException;  
import android.app.Activity;  
import android.graphics.PixelFormat;  
import android.media.AudioFormat;  
import android.media.AudioRecord;  
import android.media.MediaRecorder;  
import android.os.Bundle;  
import android.view.View;  
import android.view.View.OnClickListener;  
import android.view.Window;  
import android.view.WindowManager;  
import android.widget.Button;  
  
/** 
 * class name:TestAudioRecord<BR> 
 * class description:用AudioRecord来进行录音<BR> 
 * PS: <BR> 
 *  
 * @version 1.00 2011/09/21 
 * @author CODYY)peijiangping 
 */  
public class TestAudioRecord extends Activity {  
    // 音频获取源  
    private int audioSource = MediaRecorder.AudioSource.MIC;  
    // 设置音频采样率,44100是目前的标准,但是某些设备仍然支持22050,16000,11025  
    private static int sampleRateInHz = 44100;  
    // 设置音频的录制的声道CHANNEL_IN_STEREO为双声道,CHANNEL_CONFIGURATION_MONO为单声道  
    private static int channelConfig = AudioFormat.CHANNEL_IN_STEREO;  
    // 音频数据格式:PCM 16位每个样本。保证设备支持。PCM 8位每个样本。不一定能得到设备支持。  
    private static int audioFormat = AudioFormat.ENCODING_PCM_16BIT;  
    // 缓冲区字节大小  
    private int bufferSizeInBytes = 0;  
    private Button Start;  
    private Button Stop;  
    private AudioRecord audioRecord;  
    private boolean isRecord = false;// 设置正在录制的状态  
    //AudioName裸音频数据文件  
    private static final String AudioName = "/sdcard/love.raw";  
    //NewAudioName可播放的音频文件  
    private static final String NewAudioName = "/sdcard/new.wav";  
  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        getWindow().setFormat(PixelFormat.TRANSLUCENT);// 让界面横屏  
        requestWindowFeature(Window.FEATURE_NO_TITLE);// 去掉界面标题  
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,  
                WindowManager.LayoutParams.FLAG_FULLSCREEN);  
        // 重新设置界面大小  
        setContentView(R.layout.main);  
        init();  
    }  
  
    private void init() {  
        Start = (Button) this.findViewById(R.id.start);  
        Stop = (Button) this.findViewById(R.id.stop);  
        Start.setOnClickListener(new TestAudioListener());  
        Stop.setOnClickListener(new TestAudioListener());  
        creatAudioRecord();  
    }  
  
    private void creatAudioRecord() {  
        // 获得缓冲区字节大小  
        bufferSizeInBytes = AudioRecord.getMinBufferSize(sampleRateInHz,  
                channelConfig, audioFormat);  
        // 创建AudioRecord对象  
        audioRecord = new AudioRecord(audioSource, sampleRateInHz,  
                channelConfig, audioFormat, bufferSizeInBytes);  
    }  
  
    class TestAudioListener implements OnClickListener {  
  
        @Override  
        public void onClick(View v) {  
            if (v == Start) {  
                startRecord();  
            }  
            if (v == Stop) {  
                stopRecord();  
            }  
  
        }  
  
    }  
  
    private void startRecord() {  
        audioRecord.startRecording();  
        // 让录制状态为true  
        isRecord = true;  
        // 开启音频文件写入线程  
        new Thread(new AudioRecordThread()).start();  
    }  
  
    private void stopRecord() {  
        close();  
    }  
  
    private void close() {  
        if (audioRecord != null) {  
            System.out.println("stopRecord");  
            isRecord = false;//停止文件写入  
            audioRecord.stop();  
            audioRecord.release();//释放资源  
            audioRecord = null;  
        }  
    }  
  
    class AudioRecordThread implements Runnable {  
        @Override  
        public void run() {  
            writeDateTOFile();//往文件中写入裸数据  
            copyWaveFile(AudioName, NewAudioName);//给裸数据加上头文件  
        }  
    }  
  
    /** 
     * 这里将数据写入文件,但是并不能播放,因为AudioRecord获得的音频是原始的裸音频, 
     * 如果需要播放就必须加入一些格式或者编码的头信息。但是这样的好处就是你可以对音频的 裸数据进行处理,比如你要做一个爱说话的TOM 
     * 猫在这里就进行音频的处理,然后重新封装 所以说这样得到的音频比较容易做一些音频的处理。 
     */  
    private void writeDateTOFile() {  
        // new一个byte数组用来存一些字节数据,大小为缓冲区大小  
        byte[] audiodata = new byte[bufferSizeInBytes];  
        FileOutputStream fos = null;  
        int readsize = 0;  
        try {  
            File file = new File(AudioName);  
            if (file.exists()) {  
                file.delete();  
            }  
            fos = new FileOutputStream(file);// 建立一个可存取字节的文件  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        while (isRecord == true) {  
            readsize = audioRecord.read(audiodata, 0, bufferSizeInBytes);  
            if (AudioRecord.ERROR_INVALID_OPERATION != readsize) {  
                try {  
                    fos.write(audiodata);  
                } catch (IOException e) {  
                    e.printStackTrace();  
                }  
            }  
        }  
        try {  
            fos.close();// 关闭写入流  
        } catch (IOException e) {  
            e.printStackTrace();  
        }  
    }  
  
    // 这里得到可播放的音频文件  
    private void copyWaveFile(String inFilename, String outFilename) {  
        FileInputStream in = null;  
        FileOutputStream out = null;  
        long totalAudioLen = 0;  
        long totalDataLen = totalAudioLen + 36;  
        long longSampleRate = sampleRateInHz;  
        int channels = 2;  
        long byteRate = 16 * sampleRateInHz * channels / 8;  
        byte[] data = new byte[bufferSizeInBytes];  
        try {  
            in = new FileInputStream(inFilename);  
            out = new FileOutputStream(outFilename);  
            totalAudioLen = 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();  
        }  
    }  
  
    /** 
     * 这里提供一个头信息。插入这些信息就可以得到可以播放的文件。 
     * 为我为啥插入这44个字节,这个还真没深入研究,不过你随便打开一个wav 
     * 音频的文件,可以发现前面的头文件可以说基本一样哦。每种格式的文件都有 
     * 自己特有的头文件。 
     */  
    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] = 16; // 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);  
    }  
  
    @Override  
    protected void onDestroy() {  
        close();  
        super.onDestroy();  
    }  
}  
原文地址:https://www.cnblogs.com/xuewater/p/2617538.html