我想查的声音在Android上的响度 [英] I want to check the loudness of voice in android

问题描述

我开发一个应用程序，我要检测声音的响度。意味着一些上喊声上移动，它会显示在屏幕上的响度水平

I am developing an application where I have to detect the loudness of voice. Means some on shouts on the mobile and it will show the loudness level on the screen.

让我知道这个任何合适的API。它的API，我可以在Android中使用。

Let me know any suitable API for this. Which API I can use in android.

在此先感谢。

普拉

推荐答案

看 http://developer.android.com/reference/android/media/AudioRecord.html

当你读缓冲区的字节值将重新present幅度。较高的字节值越响的声音。

When you read the buffer the byte values will represent the amplitude. The higher the byte value the louder the sound.

下面是一些我用在一个应用程序，我写了一段时间后一个缩小版：

Here is a scaled-down version of something I used in an app I wrote a while back:

添加到您的mainifest.xml
＆LT;使用-权限的Andr​​oid：名称=android.permission.RECORD_AUDIO/＆GT;

Add this to your mainifest.xml
<uses-permission android:name="android.permission.RECORD_AUDIO" />

soundlevel.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <ToggleButton
        android:id="@+id/togglebutton_record"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="ToggleButton" />


    <ProgressBar
        android:id="@+id/progressbar_level"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

SoundLevel.java

import android.app.Activity;
import android.media.AudioFormat;
import android.media.AudioRecord;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Handler;
import android.os.SystemClock;
import android.widget.CompoundButton;
import android.widget.ProgressBar;
import android.widget.ToggleButton;

public class SoundLevel extends Activity {

    private static final int sampleRate = 11025;
    private static final int bufferSizeFactor = 10; 

    private AudioRecord audio;
    private int bufferSize;

    private ProgressBar level;

    private Handler handler = new Handler();

    private int lastLevel = 0;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.soundlevel);

        level = (ProgressBar) findViewById(R.id.progressbar_level);

        level.setMax(32676);

        ToggleButton record = (ToggleButton) findViewById(R.id.togglebutton_record);

        record.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                // TODO Auto-generated method stub

                if (isChecked) {
                    bufferSize = AudioRecord.getMinBufferSize(sampleRate, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT) * bufferSizeFactor; 

                    audio = new AudioRecord(MediaRecorder.AudioSource.MIC, sampleRate, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT, bufferSize);

                    audio.startRecording();

                    Thread thread = new Thread(new Runnable() {
                        public void run() {
                            readAudioBuffer();
                        }     
                      });

                    thread.setPriority(Thread.currentThread().getThreadGroup().getMaxPriority());

                    thread.start();

                    handler.removeCallbacks(update);
                    handler.postDelayed(update, 25);

                } else if (audio != null) {
                    audio.stop();
                    audio.release();
                    audio = null;
                    handler.removeCallbacks(update);
                }

            }
        });
    }

    private void readAudioBuffer() {

        try {
            short[] buffer = new short[bufferSize];

            int bufferReadResult;

            do {

                bufferReadResult = audio.read(buffer, 0, bufferSize);

                for (int i = 0; i < bufferReadResult; i++){

                    if (buffer[i] > lastLevel) {
                        lastLevel = buffer[i];  
                    }

                }

            } while (bufferReadResult > 0 && audio.getRecordingState() == AudioRecord.RECORDSTATE_RECORDING);

            if (audio != null) {
                audio.release();
                audio = null;
                handler.removeCallbacks(update);

            }

        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    private Runnable update = new Runnable() {

        public void run() {

            SoundLevel.this.level.setProgress(lastLevel);

            lastLevel *= .5;

            handler.postAtTime(this, SystemClock.uptimeMillis() + 500);

        }

    };
}

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