在android中使用MIC以mp3格式录制音频

Posted 2023-02-25

【中文标题】在android中使用MIC以mp3格式录制音频

【英文标题】：recordAudio in mp3 format using MIC in android

【发布时间】：2014-05-28 07:04:07

【问题描述】：

我想在 android 中使用 MIC 以 mp3 格式录制音频。 我尝试记录以下代码， 但是当我检查 sdcard（路径：sdcard/recording.mp3）时，该文件不起作用。 （文件大小为0kb）。

如何在 android 中以 mp3 或 wav 格式录制麦克风音频。 请帮忙。

private final int FREQUENCY = 11025;
private final int CUSTOM_FREQ_SOAP = 1;
private final int OUT_FREQUENCY = FREQUENCY * CUSTOM_FREQ_SOAP;
private final int CHANNEL_CONTIGURATION = AudioFormat.CHANNEL_CONFIGURATION_MONO;
private final int AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT;

======

try 
        mRecordingFile = File.createTempFile("recording", ".mp3", new File("/sdcard/"));


     catch (IOException e) 
        throw new RuntimeException("Couldn't create file on SD card", e);
    

======

private class RecordAudio extends AsyncTask<Void, Integer, Void> 
    @Override
    protected Void doInBackground(Void... params) 
        isRecording = true;
        try 
            DataOutputStream dos = new DataOutputStream(
                    new BufferedOutputStream(new FileOutputStream(
                            mRecordingFile, true)));

            int bufferSize = AudioRecord.getMinBufferSize(FREQUENCY,
                    CHANNEL_CONTIGURATION, AUDIO_ENCODING);

            AudioRecord audioRecord = new AudioRecord(
                    MediaRecorder.Audiosource.MIC, FREQUENCY,
                    CHANNEL_CONTIGURATION, AUDIO_ENCODING, bufferSize);

            short[] buffer = new short[bufferSize];
            audioRecord.startRecording();

            while (isRecording) 
                int bufferReadResult = audioRecord.read(buffer, 0,
                        bufferSize);
                int amplitude = 0;
                for (int i = 0; i < bufferReadResult; i++) 
                    dos.writeShort(buffer[i]);
                    amplitude += Math.abs((int) buffer[i]);
                
                final int amp = amplitude;

            

            audioRecord.stop();
                //dos.close();


         catch (Throwable t) 
        

        return null;
    

【参考方案1】：

public void recordAudio(String fileName) 
    final MediaRecorder recorder = new MediaRecorder();
    ContentValues values = new ContentValues(3);
    values.put(MediaStore.MediaColumns.TITLE, fileName);
    recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    recorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
    recorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);
    recorder.setOutputFile("/sdcard/sound/" + fileName);
    try 
      recorder.prepare();
     catch (Exception e)
        e.printStackTrace();
    

    final ProgressDialog mProgressDialog = new ProgressDialog(MyActivity.this);
    mProgressDialog.setTitle(R.string.lbl_recording);
    mProgressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
    mProgressDialog.setButton("Stop recording", new DialogInterface.OnClickListener() 
    public void onClick(DialogInterface dialog, int whichButton) 
        mProgressDialog.dismiss();
        recorder.stop();
        recorder.release();
        
    );

    mProgressDialog.setOnCancelListener(new DialogInterface.OnCancelListener()
        public void onCancel(DialogInterface p1) 
            recorder.stop();
            recorder.release();
        
    );
    recorder.start();
    mProgressDialog.show();

【讨论】：

我认为，在这种情况下，它不支持 mp3 格式..（输出格式为 MPEG_4）... TT