Android下AudioRecord采集音频写入PCM和WAV文件中

本文主要是介绍Android下AudioRecord采集音频写入PCM和WAV文件中，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

前面一篇介绍了《Android下使用 AudioRecord 和 AudioTrack 实现音频 PCM 数据的采集和播放》,这一篇介绍怎么将采集到的音频数据保存到PCM和wav文件中。其实保存PCM数据不难，只要直接写入文件即可，而保存数据至wav文件只需要将wav文件格式头补上即可。

1、MainActivity.java文件

package com.example.tongjiangsong.audiorecordtrackdemo;import android.os.Bundle;import java.io.IOException;
import java.io.PipedInputStream;
import java.io.PipedOutputStream;import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;public class MainActivity extends Activity  implements View.OnClickListener {PipedInputStream in;boolean isRecord;MAudioRecord m_audio_record ;Button record_btn;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);isRecord = false;record_btn = (Button)findViewById(R.id.button);record_btn.setOnClickListener(this);}private void startRecord(){in = new PipedInputStream();new Thread(new Runnable() {@Overridepublic void run() {try {m_audio_record = new MAudioRecord(MainActivity.this, in);m_audio_record.StartAudioData();} catch (IOException e) {e.printStackTrace();}}}).start();}@Overridepublic void onClick(View view) {if (isRecord){isRecord = false;m_audio_record.stopRecord();m_audio_player.stopPlay();}else{isRecord = true;startRecord();}}
}

2、MAudioRecord.java文件

package com.example.tongjiangsong.audiorecordtrackdemo;import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PipedInputStream;
import java.io.PipedOutputStream;import android.content.Context;
import android.media.AudioFormat;
import android.media.AudioRecord;
import android.media.MediaRecorder;
import android.os.Environment;
import android.util.Log;import static android.content.ContentValues.TAG;/** To getaudio or play audio* */
public class MAudioRecord {private AudioRecord audioRecord;private Context context;private boolean isRecording = false ;private int buffersize = 0;private PipedOutputStream outstream ;//利用管道传输数据public MAudioRecord(Context context , PipedInputStream instream) throws IOException {this.context  = context;//初始化管道流 用于向外传输数据outstream = new PipedOutputStream();outstream.connect(instream);}public void StartAudioData(){//得到录音数据int frequency = 11025;int channelConfiguration = AudioFormat.CHANNEL_IN_STEREO;int audioEncoding = AudioFormat.ENCODING_PCM_16BIT;buffersize = AudioRecord.getMinBufferSize(frequency, channelConfiguration, audioEncoding);audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, frequency, channelConfiguration, audioEncoding, buffersize);byte[] buffer  = new byte[1024];audioRecord.startRecording();//开始录音isRecording = true;int bufferReadSize = 1024;String tmpName = System.currentTimeMillis()+"_"+44100+"";final File tmpFile = createFile(tmpName+".pcm");final File tmpOutFile = createFile(tmpName+".wav");try {FileOutputStream outputStream = new FileOutputStream(tmpFile.getAbsoluteFile());while (isRecording){int n_size = audioRecord.read(buffer, 0, 1024);Log.w("audiotest", "StartAudioData: ------------------------"+n_size);try {outputStream.write(buffer);} catch (IOException e) {e.printStackTrace();}}outputStream.close();pcmToWave(tmpFile.getAbsolutePath(), tmpOutFile.getAbsolutePath());} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}public File createFile(String name) {String dirPath = Environment.getExternalStorageDirectory().getPath()+"/AudioRecord/";File file = new File(dirPath);if(!file.exists()) {file.mkdirs();}String filePath = dirPath +name;File objFile = new File(filePath);if (!objFile.exists()) {try {objFile.createNewFile();} catch (IOException e) {e.printStackTrace();}return objFile;}return null;}public void stopRecord(){//停止录音isRecording = false;audioRecord.stop();audioRecord.release();try {outstream.close();} catch (IOException e) {e.printStackTrace();}}public void pcmToWave(String inFileName, String outFileName){FileInputStream in = null;FileOutputStream out = null;long totalAudiolen = 0;long longSamplRate = 11025;long totalDataLen = totalAudiolen+36;//由于不包括RIFF和WAVint channels = 2;long byteRate = 16*longSamplRate*channels/8;byte[] data = new byte[1024];try {in = new FileInputStream(inFileName);out = new FileOutputStream(outFileName);totalAudiolen = in.getChannel().size();totalDataLen = totalAudiolen+36;writeWaveFileHeader(out, totalAudiolen, totalDataLen, longSamplRate, channels, byteRate);while (in.read(data) != -1) {out.write(data);}in.close();out.close();} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}public void writeWaveFileHeader(FileOutputStream out, long totalAudioLen, long totalDataLen, long longSampleRate,int channels, long byteRate) {byte[] header = new byte[44];header[0] = 'R'; // RIFFheader[1] = 'I';header[2] = 'F';header[3] = 'F';header[4] = (byte) (totalDataLen & 0xff);//数据大小header[5] = (byte) ((totalDataLen >> 8) & 0xff);header[6] = (byte) ((totalDataLen >> 16) & 0xff);header[7] = (byte) ((totalDataLen >> 24) & 0xff);header[8] = 'W';//WAVEheader[9] = 'A';header[10] = 'V';header[11] = 'E';//FMT Chunkheader[12] = 'f'; // 'fmt 'header[13] = 'm';header[14] = 't';header[15] = ' ';//过渡字节//数据大小header[16] = 16; // 4 bytes: size of 'fmt ' chunkheader[17] = 0;header[18] = 0;header[19] = 0;//编码方式 10H为PCM编码格式header[20] = 1; // format = 1header[21] = 0;//通道数header[22] = (byte) channels;header[23] = 0;//采样率，每个通道的播放速度header[24] = (byte) (longSampleRate & 0xff);header[25] = (byte) ((longSampleRate >> 8) & 0xff);header[26] = (byte) ((longSampleRate >> 16) & 0xff);header[27] = (byte) ((longSampleRate >> 24) & 0xff);//音频数据传送速率,采样率*通道数*采样深度/8header[28] = (byte) (byteRate & 0xff);header[29] = (byte) ((byteRate >> 8) & 0xff);header[30] = (byte) ((byteRate >> 16) & 0xff);header[31] = (byte) ((byteRate >> 24) & 0xff);// 确定系统一次要处理多少个这样字节的数据，确定缓冲区，通道数*采样位数header[32] = (byte) (channels * 16 / 8);header[33] = 0;//每个样本的数据位数header[34] = 16;header[35] = 0;//Data chunkheader[36] = 'd';//dataheader[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);try {out.write(header, 0, 44);} catch (IOException e) {e.printStackTrace();}}
}

3、设置权限

 <uses-permission android:name="android.permission.RECORD_AUDIO"/><uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

 

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