Android实现伴奏录音合成MP3

 /**  * 播放伴奏  */ private MediaPlayer player; /**  * 返回按钮  */ private ImageView btnBack; /**  * 切换歌曲  */ private Button btnSwitchSong; /**  * 伴唱时长  */ private TextView tv_recod_time; /**  * 歌词VIEW  */ private LyricView lv_lyric; /**  * 开始录制  */ private Button btnPlay; /**  * 标题  */ private TextView ivTitle; private boolean canPlay = true; private boolean isPause = false;  /***  * 背景音乐模式  */ private BackgroudMusicMode mode = BackgroudMusicMode.Accompany; /**  * 歌曲id  */ private String songId; /**  * 歌曲名称  */ private String songName; /**  * 歌手名字  */ private String singerName; /**  * 伴奏文件  */ private File file; /**  * 是否正在录制  */ private boolean isStart = false; /**  * 录音状态  */ private boolean starting = false; /**  * 伴奏时间  */ private int bztimetmp = 0; /**  * 伴奏时间  */ private String bztime = "";  /**  * 录制时间  */ private int recordTimeLength=0; /**  * 更新伴奏时间  */ private RecordTask rt = null;  /**  * 录制频率，单位hz.这里的值注意了，写的不好，可能实例化AudioRecord对象的时候，会出错。我开始写成11025就不行。这取决于硬件设备  * 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 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 int channelConfig = AudioFormat.CHANNEL_CONFIGURATION_MONO;  /**  * 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 int audioFormat = AudioFormat.ENCODING_PCM_16BIT;  /**  * 调整播放音量  */ private AudioManager audioManager;  /**  * 最大音量  */ private int maxVolume = 0;  /**  * 当前音量  */ private int currentVolume = 0;  /**  * AudioRecord 写入缓冲区大小  */ protected int m_in_buf_size; /**  * 录制音频对象  */ private AudioRecord mRecorder; /**  * 录入的字节数组  */ private byte[] m_in_bytes; /**  * 存放录入字节数组的大小  */ private LinkedList<byte[]> m_in_q; /**  * AudioTrack 播放缓冲大小  */ private int m_out_buf_size; /**  * 播放音频对象  */ private AudioTrack mAudioTrack; /**  * 播放的字节数组  */ private byte[] m_out_bytes; /**  * 录制音频线程  */ private Thread record; /**  * 播放音频线程  */ private Thread play; /**  * 让线程停止的标志  */ private boolean flag = true; /**  * 是否启动回声  */ private boolean room_flag = true;  /***上面有个播放歌词的组件  /***  * 初始化  */ private void init() {    audioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);  maxVolume = audioManager.getStreamMaxVolume(AudioManager.STREAM_VOICE_CALL);  currentVolume = audioManager.getStreamVolume(AudioManager.STREAM_VOICE_CALL);  registerHeadsetPlugReceiver();  ycApplication = (YueChangApplication) getApplication();  coverDao = new CoverDao(getApplicationContext());  Bundle bundle = getIntent().getExtras();  songId = bundle.getString("songId");  songName = bundle.getString("songName");  singerName = bundle.getString("singerName");  if (songId != null) {   // AudioRecord 得到录制最小缓冲区的大小   m_in_buf_size = AudioRecord.getMinBufferSize(sampleRateInHz, channelConfig, audioFormat);   // 实例化播放音频对象   mRecorder = new AudioRecord(MediaRecorder.AudioSource.MIC, sampleRateInHz, channelConfig, audioFormat,     m_in_buf_size);   // 实例化一个字节数组，长度为最小缓冲区的长度   m_in_bytes = new byte[m_in_buf_size];   // 实例化一个链表，用来存放字节组数   m_in_q = new LinkedList<byte[]>();    // AudioTrack 得到播放最小缓冲区的大小   m_out_buf_size = AudioTrack.getMinBufferSize(sampleRateInHz, channelConfig, audioFormat);   // 实例化播放音频对象   mAudioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, sampleRateInHz, channelConfig, audioFormat,     m_out_buf_size, AudioTrack.MODE_STREAM);   // 实例化一个长度为播放最小缓冲大小的字节数组   m_out_bytes = new byte[m_out_buf_size];   record = new Thread(new recordSound());   //   if(ycApplication.isHeadsetplug()){    //   }else{//    m_out_trk = new AudioTrack(AudioManager.STREAM_MUSIC, sampleRateInHz, channelConfig, audioFormat,//      m_out_buf_size, AudioTrack.MODE_STREAM);//   }      } }   /**  *  * 类描述：录音线程   *  * @version 1.0  */ class recordSound implements Runnable {  @Override  public void run() {   // 初始化输出流   DataOutputStream dos = null;   try {    File audioFile = new File(SongUtil.getRecordSingPCMPath(songId));    // 初始化输出流    dos = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(audioFile)));    byte[] bytes_pkg;    if (mRecorder.getState() == AudioRecord.STATE_UNINITIALIZED) {     // 实例化播放音频对象     mRecorder = new AudioRecord(MediaRecorder.AudioSource.MIC, sampleRateInHz, channelConfig,       audioFormat, m_in_buf_size);    }     // 开始录音    mRecorder.startRecording();    while (flag) {     int size = mRecorder.read(m_in_bytes, 0, m_in_buf_size);     bytes_pkg = m_in_bytes.clone();     if (m_in_q.size() >= 2) {      m_in_q.removeFirst();     }     m_in_q.add(bytes_pkg);     if ((ycApplication.isHeadsetplug() && ycApplication.isOpenInEarphone())       || (!ycApplication.isHeadsetplug() && ycApplication.isOpenInSpeaker())) {      //Log.d(SingSingleActivity.this.getClass().getName(), "启动录音播放1");      if (play == null||!room_flag) {       //Log.d(SingSingleActivity.this.getClass().getName(), "启动录音播放2");       room_flag = true;       play = new Thread(new playRecord());       // 启动播放线程       play.start();      }      } else {      if(room_flag||play != null){       //Log.d(SingSingleActivity.this.getClass().getName(), "关闭录音播放1");       room_flag = false;       if (play != null) {        play.interrupt();       }       play = null;      }     }     // 写入PCM文件     dos.write(bytes_pkg, 0, size);     dos.flush();    }    } catch (Exception e) {    // TODO: handle exception    e.printStackTrace();   } finally {    try {     // 关闭录音     if (mRecorder != null) {      try {       if (mRecorder.getState() == AudioRecord.STATE_INITIALIZED) {        // 关闭录音        mRecorder.stop();        mRecorder.release();       }      } catch (Exception e2) {       // TODO: handle exception      }     }     if (dos != null) {      dos.close();     }    } catch (Exception e2) {     // TODO: handle exception     e2.printStackTrace();    }   }   } }

/*** * 方法描述：本地方法调用JNI合并mp3PCM与sourcePCM * @param sourcePCM * @param mp3PCM * @param mixPCM * @return */ public static native int mix2PCMToPCM(String sourcePCM, String mp3PCM, String mixPCM);  String recordPCMPath = SongUtil.getRecordSingPCMPath(songId); //录音生成的PCM文件      String accompanyPCMPath = SongUtil.getAccompanySongPCMPath(songId); //伴奏解码生成的PCM文件      String mixPCMPath = SongUtil.getMixSingPCMPath(songId); //合成后的PCM文件      String mixMP3Path = SongUtil.getMixSingMp3Path(songId); //合成后的MP3文件      // 混音      int code = SongEncodeUtil.mix2PCMToPCM(recordPCMPath, accompanyPCMPath, mixPCMPath);      if (code == 0) {       // 转换混合后音频格式 TO mp3       int i = SimpleLame.convert(mixPCMPath, mixMP3Path, m_in_buf_size);       Log.i(SingSingleActivity.this.getClass().getName(), "转换" + i + "混音完成");       saveMp3File(mixMP3Path);      }