Android音频录制到wav

我用Android上的录音机录制了一段音频,它生成了一个原始PCM文件。我正在尝试将其转换为我可以听的格式(例如wav或mp3)。

我从这个例子开始,但不知道从这里开始: Android AudioRecord example

尝试以下操作: http://computermusicblog.com/blog/2008/08/29/reading-and-writing-wav-files-in-java

Recording .Wav with Android AudioRecorder

这是我要录制的代码(注意,我正在使用倒计时来告诉它何时开始和停止录制。

public class AudioRecordService extends Service {
    Toast toast;
    private static final int RECORDER_SAMPLERATE = 44100;
    private static final int RECORDER_CHANNELS = AudioFormat.CHANNEL_IN_MONO;
    private static final int RECORDER_AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT;
    private AudioRecord record = null;
    int BufferElements2Rec = 1024; // want to play 2048 (2K) since 2 bytes we use only 1024
    int BytesPerElement = 2; // 2 bytes in 16bit format
    private Thread recordingThread = null;
    private boolean isRecording = false;
    int buffsize = 0;

    public AudioRecordService() {
    }

    @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
        throw new UnsupportedOperationException("Not yet implemented");
    }

    public int onStartCommand(Intent intent, int flags, int startId)
    {
        try {
            buffsize = AudioRecord.getMinBufferSize(RECORDER_SAMPLERATE, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT);

            record = new AudioRecord(MediaRecorder.AudioSource.MIC,
                RECORDER_SAMPLERATE, RECORDER_CHANNELS,
                RECORDER_AUDIO_ENCODING, buffsize);

            record.startRecording();

            CountDownTimer countDowntimer = new CountDownTimer(15000, 1000) {
                public void onTick(long millisUntilFinished) {
                    toast = Toast.makeText(AudioRecordService.this, "Recording", Toast.LENGTH_SHORT);
                    toast.show();
                    isRecording = true;
                    recordingThread = new Thread(new Runnable() {
                        public void run() {
                            writeAudioDataToFile();
                        }
                    }, "AudioRecorder Thread");
                    recordingThread.start();
                }

                public void onFinish() {
                    try {
                        toast.cancel();
                        Toast.makeText(AudioRecordService.this, "Done Recording ", Toast.LENGTH_SHORT).show();
                        isRecording = false;
                        record.stop();
                        record.release();
                        record = null;
                        recordingThread = null;
                    } catch (Exception e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }


            }};
            countDowntimer.start();
        }
        catch (Exception ex)
        {
            ex.printStackTrace();
        }
        return Service.START_STICKY;
    }

    private byte[] short2byte(short[] sData) {
        int shortArrsize = sData.length;
        byte[] bytes = new byte[shortArrsize * 2];
        for (int i = 0; i < shortArrsize; i++) {
            bytes[i * 2] = (byte) (sData[i] & 0x00FF);
            bytes[(i * 2) + 1] = (byte) (sData[i] >> 8);
            sData[i] = 0;
        }
        return bytes;

    }

    private void writeAudioDataToFile() {
        try {
            //String filePath = "/sdcard/voice8K16bitmono.pcm";
            String extState = Environment.getExternalStorageState();
            // Path to write files to
            String path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC + "/test").getAbsolutePath();

            String fileName = "audio.pcm";
            String externalStorage = Environment.getExternalStorageDirectory().getAbsolutePath();
            File file = new File(externalStorage + File.separator + fileName);

            // if file doesnt exists, then create it
            if (!file.exists()) {
                file.createNewFile();
            }
            short sData[] = new short[BufferElements2Rec];

            FileOutputStream os = null;
            try {
                os = new FileOutputStream(file);
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }

            while (isRecording) {
                // gets the voice output from microphone to byte format

                record.read(sData, 0, BufferElements2Rec);
                System.out.println("Short wirting to file" + sData.toString());
                try {
                    // // writes the data to file from buffer
                    // // stores the voice buffer
                    byte bData[] = short2byte(sData);
                    os.write(bData, 0, BufferElements2Rec * BytesPerElement);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            try {
                os.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}

我的音频。创建pcm。但是我不知道怎么玩。我假设bDate[]是正在写入的字节数组。我创建的链接说他们使用了这些文件,但没有显示如何实现的示例。

如果重要的话,我已经用GoldWave打开了文件。它打开了,但音频被打乱了。

我还注意到我的文件是2秒,我认为这是因为BytesPerElement和BufferElements2Rec。如果你能帮我,那么15秒就好了。

提前感谢!