Android实现伴奏录音合成MP3

本文实例为大家分享了Android实现伴奏录音合成MP3的具体代码，供大家参考，具体内容如下

基本实现思路如下:

1.利用android自带的录音类(AudioRecord)实现录音.

 
 private MediaPlayer player;
 
 private ImageView btnBack;
 
 private Button btnSwitchSong;
 
 private TextView tv_recod_time;
 
 private LyricView lv_lyric;
 
 private Button btnPlay;
 
 private TextView ivTitle;
 private boolean canPlay = true;
 private boolean isPause = false;
 
 
 private BackgroudMusicMode mode = BackgroudMusicMode.Accompany;
 
 private String songId;
 
 private String songName;
 
 private String singerName;
 
 private File file;
 
 private boolean isStart = false;
 
 private boolean starting = false;
 
 private int bztimetmp = 0;
 
 private String bztime = "";
 
 
 private int recordTimeLength=0;
 
 private RecordTask rt = null;
 
 
 private int sampleRateInHz = 44100;
 
 private int channelConfig = AudioFormat.CHANNEL_CONFIGURATION_MONO;
 
 
 private int audioFormat = AudioFormat.ENCODING_PCM_16BIT;
 
 
 private AudioManager audioManager;
 
 
 private int maxVolume = 0;
 
 
 private int currentVolume = 0;
 
 
 protected int m_in_buf_size;
 
 private AudioRecord mRecorder;
 
 private byte[] m_in_bytes;
 
 private linkedList m_in_q;
 
 private int m_out_buf_size;
 
 private AudioTrack mAudioTrack;
 
 private byte[] m_out_bytes;
 
 private Thread record;
 
 private Thread play;
 
 private boolean flag = true;
 
 private boolean room_flag = true;
 
 
 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();
 
   // 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);
//   }
   
 
  }
 }
 
  
 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();
    }
   }
 
  }
 }

2.录音完成后，调用开源工具(Mad)实现PCM合成输出到MP3文件.

主要调用的合成方法：

 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);
      }

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。