android:检测声级 [英] android: Detect sound level

问题描述

使用 MediaRecorder 我从设备的麦克风捕获声音.从我得到的声音中，我只需要分析音量(声音响度)，而无需将声音保存到文件中.

Using MediaRecorder I capture sound from device's microphone. From the sound I get I need only to analyze the sound volume (sound loudness), without saving the sound to a file.

两个问题:

1. 如何获得特定时刻声音的响度?
2. 如何在不将声音保存到文件的情况下进行分析?

谢谢.

推荐答案

1. 使用mRecorder.getMaxAmplitude();

为了在不保存的情况下分析声音，您只需要使用 mRecorder.setOutputFile("/dev/null");

For the analysis of sound without saving all you need is use mRecorder.setOutputFile("/dev/null");

举个例子，希望能帮到你

Here´s an example, I hope this helps

public class SoundMeter {

    private MediaRecorder mRecorder = null;

    public void start() {
            if (mRecorder == null) {
                    mRecorder = new MediaRecorder();
                    mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
                    mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
                    mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
                    mRecorder.setOutputFile("/dev/null"); 
                    mRecorder.prepare();
                    mRecorder.start();
            }
    }

    public void stop() {
            if (mRecorder != null) {
                    mRecorder.stop();       
                    mRecorder.release();
                    mRecorder = null;
            }
    }

    public double getAmplitude() {
            if (mRecorder != null)
                    return  mRecorder.getMaxAmplitude();
            else
                    return 0;

    }
}

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