如何增加AudioTrack的放大？

Question

我有以下代码：

public class MainActivity extends Activity {
    private int freq = 8000;
    private AudioRecord audioRecord = null;
    private Thread Rthread = null;

    int PERMISSION_ALL = 1;
    String[] PERMISSIONS = {Manifest.permission.RECORD_AUDIO};

    private AudioTrack audioTrack = null;
    byte[] buffer = new byte[freq];
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if(!hasPermissions(this, PERMISSIONS)){
            ActivityCompat.requestPermissions(this, PERMISSIONS, PERMISSION_ALL);
        }

        android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_URGENT_AUDIO);
        final int bufferSize = AudioRecord.getMinBufferSize(freq,
                AudioFormat.CHANNEL_CONFIGURATION_MONO,
                AudioFormat.ENCODING_PCM_16BIT);


        audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, freq,
                AudioFormat.CHANNEL_CONFIGURATION_MONO,
                MediaRecorder.AudioEncoder.AMR_NB, bufferSize);

        audioTrack = new AudioTrack(AudioManager.ROUTE_HEADSET, freq,
                AudioFormat.CHANNEL_CONFIGURATION_MONO,
                MediaRecorder.AudioEncoder.AMR_NB, bufferSize,
                AudioTrack.MODE_STREAM);

        LoudnessEnhancer enhancer = new LoudnessEnhancer(audioTrack.getAudioSessionId());

        enhancer.setTargetGain(100);
        enhancer.setEnabled(true);


        audioTrack.setPlaybackRate(freq);
        buffer = new byte[bufferSize];
        audioRecord.startRecording();
        Log.i("info", "Audio Recording started");
        audioTrack.play();
        Log.i("info", "Audio Playing started");
        Rthread = new Thread(new Runnable() {
            public void run() {
                while (true) {
                    try {
                        audioRecord.read(buffer, 0, bufferSize);
                        audioTrack.write(buffer, 0, buffer.length);

                    } catch (Throwable t) {
                        Log.e("Error", "Read write failed");
                        t.printStackTrace();
                    }
                }
            }
        });
        Rthread.start();
    }

    public static boolean hasPermissions(Context context, String... permissions) {
        if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && context != null && permissions != null) {
            for (String permission : permissions) {
                if (ActivityCompat.checkSelfPermission(context, permission) != PackageManager.PERMISSION_GRANTED) {
                    return false;
                }
            }
        }
        return true;
    }
}

此代码能够读取麦克风的输入并在扬声器/连接的耳机上播放。到目前为止，一切都很好。现在，我需要放大输入的音量。我已经尝试了here提出的解决方案，但最终我得到的音频确实失真。我也尝试了LoudnessEnhancer，但似乎没有任何效果。

Answer 1

好的，我成功让 LoudnessEnhancer 正常工作了。我知道其中有巨大的增益值，但我需要在这方面获得很多增益。这是为可能遇到类似问题的其他人提供的更新代码。

public class MainActivity extends Activity {
    private int freq = 8000;
    private AudioRecord audioRecord = null;
    private Thread Rthread = null;

    int PERMISSION_ALL = 1;
    String[] PERMISSIONS = {Manifest.permission.RECORD_AUDIO};

    private AudioTrack audioTrack = null;
    byte[] buffer = new byte[freq];
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if(!hasPermissions(this, PERMISSIONS)){
            ActivityCompat.requestPermissions(this, PERMISSIONS, PERMISSION_ALL);
        }

        android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_URGENT_AUDIO);
        final int bufferSize = AudioRecord.getMinBufferSize(freq,
                AudioFormat.CHANNEL_CONFIGURATION_MONO,
                AudioFormat.ENCODING_PCM_16BIT);


        audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, freq,
                AudioFormat.CHANNEL_CONFIGURATION_MONO,
                MediaRecorder.AudioEncoder.AMR_NB, bufferSize);

        audioTrack = new AudioTrack(AudioManager.ROUTE_HEADSET, freq,
                AudioFormat.CHANNEL_CONFIGURATION_MONO,
                MediaRecorder.AudioEncoder.AMR_NB, bufferSize,
                AudioTrack.MODE_STREAM);

        LoudnessEnhancer enhancer = new LoudnessEnhancer(audioTrack.getAudioSessionId());
        NoiseSuppressor.create(audioTrack.getAudioSessionId());
        AcousticEchoCanceler.create(audioTrack.getAudioSessionId());

        enhancer.setTargetGain(10000);
        enhancer.setEnabled(true);


        audioTrack.setPlaybackRate(freq);
        buffer = new byte[bufferSize];
        audioRecord.startRecording();
        Log.i("info", "Audio Recording started");
        audioTrack.play();
        Log.i("info", "Audio Playing started");
        Rthread = new Thread(new Runnable() {
            public void run() {
                while (true) {
                    try {
                        audioRecord.read(buffer, 0, bufferSize);
                        audioTrack.write(buffer, 0, buffer.length);

                    } catch (Throwable t) {
                        Log.e("Error", "Read write failed");
                        t.printStackTrace();
                    }
                }
            }
        });
        Rthread.start();
    }

    public static boolean hasPermissions(Context context, String... permissions) {
        if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && context != null && permissions != null) {
            for (String permission : permissions) {
                if (ActivityCompat.checkSelfPermission(context, permission) != PackageManager.PERMISSION_GRANTED) {
                    return false;
                }
            }
        }
        return true;
    }
}

Answer 2

这是在 AudioTrack 对象中添加音频增益、噪声抑制和回声消除器的更简单方法

AudioTrack audio = new AudioTrack(yourStreamOutput,
                SAMPLING_RATE_IN_HZ,
                AudioFormat.CHANNEL_OUT_MONO,
                AUDIO_FORMAT,
                BUFFER_SIZE,
                AudioTrack.MODE_STREAM);


        setPreferredOutputDevice(audio);//this function set the output device like mobile speaker or earphone speaker or bluetooth speaker

        final LoudnessEnhancer enhancer = new LoudnessEnhancer(audio.getAudioSessionId());
        NoiseSuppressor.create(audio.getAudioSessionId()); 
        AcousticEchoCanceler.create(audio.getAudioSessionId());


        enhancer.setTargetGain(10000);//your audio gain value higher the value the louder it become
        
        enhancer.setEnabled(true);


        audio.play();