音频采集封装

/** * author 胡俊杰 Todo */package com.zx.recorder;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.os.Environment;import android.view.View;import android.view.View.OnClickListener;import android.view.Window;import android.view.WindowManager;import android.widget.Button;/** * @author Administrator */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22050，16000，11025private static int sampleRateInHz = 8000;// 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 = Environment.getExternalStorageDirectory().getPath()+ "/ademo/test.raw";// NewAudioName可播放的音频文件private static final String NewAudioName = Environment.getExternalStorageDirectory().getPath() + "/ademo/new.wav";@Overridepublic 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.activity_recorder);init();}private void init() {Start = (Button) this.findViewById(R.id.button1);Stop = (Button) this.findViewById(R.id.button3);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 {public void onClick(View v) {if (v == Start) {startRecord();}if (v == Stop) {stopRecord();}}}private void startRecord() {audioRecord.startRecording();// 让录制状态为trueisRecord = 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 {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 headerheader[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 ' chunkheader[13] = 'm';header[14] = 't';header[15] = ' ';header[16] = 16; // 4 bytes: size of 'fmt ' chunkheader[17] = 0;header[18] = 0;header[19] = 0;header[20] = 1; // format = 1header[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 alignheader[33] = 0;header[34] = 16; // bits per sampleheader[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);}@Overrideprotected void onDestroy() {close();super.onDestroy();}}