Android的AudioRecord例子 [英] Android AudioRecord example

问题描述

我设计一个Android应用程序，我需要实现一个AudioRecord类来记录用户的声音。一些研究（这并没有提供足够的信息），并几次失败的尝试后，我在想，如果有人可以帮助我通过张贴在如何捕获使用AudioRecord高音质的例子（code）。我真的AP preciate它。谢谢

I am designing an Android app and I need to implement an AudioRecord class to record the user's sound. After some research (that didn't provide enough information) and few failed attempts, I was wondering if anyone could help me by posting an example (code) on how to capture high quality sound using AudioRecord. I would really appreciate it. Thank you

推荐答案

在这里，我使用的张贴您的声音的一些code的例子，纪录良好的品质 AUDIORECORD API 。

Here I am posting you the some code example which record good quality of sound using AUDIORECORD API.

注意：如果您在仿真器使用的声音质量不会有太大的好，因为我们使用的采样率8K只支持模拟器。在设备使用的采样率，以44.1K的质量更好。

public class Audio_Record extends Activity {
private static final int RECORDER_SAMPLERATE = 8000;
private static final int RECORDER_CHANNELS = AudioFormat.CHANNEL_IN_MONO;
private static final int RECORDER_AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT;
private AudioRecord recorder = null;
private Thread recordingThread = null;
private boolean isRecording = false;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    setButtonHandlers();
    enableButtons(false);

    int bufferSize = AudioRecord.getMinBufferSize(RECORDER_SAMPLERATE,
            RECORDER_CHANNELS, RECORDER_AUDIO_ENCODING); 
}

private void setButtonHandlers() {
    ((Button) findViewById(R.id.btnStart)).setOnClickListener(btnClick);
    ((Button) findViewById(R.id.btnStop)).setOnClickListener(btnClick);
}

private void enableButton(int id, boolean isEnable) {
    ((Button) findViewById(id)).setEnabled(isEnable);
}

private void enableButtons(boolean isRecording) {
    enableButton(R.id.btnStart, !isRecording);
    enableButton(R.id.btnStop, isRecording);
}

int BufferElements2Rec = 1024; // want to play 2048 (2K) since 2 bytes we use only 1024
int BytesPerElement = 2; // 2 bytes in 16bit format

private void startRecording() {

    recorder = new AudioRecord(MediaRecorder.AudioSource.MIC,
            RECORDER_SAMPLERATE, RECORDER_CHANNELS,
            RECORDER_AUDIO_ENCODING, BufferElements2Rec * BytesPerElement);

    recorder.startRecording();
    isRecording = true;
    recordingThread = new Thread(new Runnable() {
        public void run() {
            writeAudioDataToFile();
        }
    }, "AudioRecorder Thread");
    recordingThread.start();
}

    //convert short to byte
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() {
    // Write the output audio in byte

    String filePath = "/sdcard/voice8K16bitmono.pcm";
    short sData[] = new short[BufferElements2Rec];

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

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

        recorder.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();
    }
}

private void stopRecording() {
    // stops the recording activity
    if (null != recorder) {
        isRecording = false;
        recorder.stop();
        recorder.release();
        recorder = null;
        recordingThread = null;
    }
}

private View.OnClickListener btnClick = new View.OnClickListener() {
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.btnStart: {
            enableButtons(true);
            startRecording();
            break;
        }
        case R.id.btnStop: {
            enableButtons(false);
            stopRecording();
            break;
        }
        }
    }
};

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {
        finish();
    }
    return super.onKeyDown(keyCode, event);
}
}

有关详细试试这个 AUDIORECORD BLOG 。

For more detail try this AUDIORECORD BLOG.

编码快乐！

这篇关于Android的AudioRecord例子的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！