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  1. #1

    Getting Sound Levels

    Hello there

    I'm a newbie in programming and I wanna build a sound recording application.
    I have this code which is recording sound and puts a timestamp :
    Code:
    package com.tsop.tsp_recorder;
    
    import android.R.layout;
    import android.app.Activity;
    import android.widget.HorizontalScrollView;
    import android.widget.LinearLayout;
    import android.os.Bundle;
    import android.os.Environment;
    import android.view.ViewGroup;
    import android.widget.Button;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.view.ViewGroup.MarginLayoutParams;
    import android.content.Context;
    import android.util.Log;
    import android.media.MediaRecorder;
    import android.media.MediaPlayer;
    
    import java.io.IOException;
    import java.util.Calendar;
    
    
    public class MainActivity extends Activity
    { 
    private static final String LOG_TAG = "AudioRecordTest";
        private static String mFileName = null;
    
        private RecordButton mRecordButton = null;
        private MediaRecorder mRecorder = null;
    
        private PlayButton   mPlayButton = null;
        private MediaPlayer   mPlayer = null;
    
        private void onRecord(boolean start) {
         if (start) {
                startRecording();            
            } else {
                stopRecording();
            }
        }
    
        private void onPlay(boolean start) {
            if (start) {
                startPlaying();
            } else {
                stopPlaying();
            }
        }
    
        private void startPlaying() {
            mPlayer = new MediaPlayer();
            try {
                mPlayer.setDataSource(mFileName);
                mPlayer.prepare();
                mPlayer.start();
            } catch (IOException e) {
                Log.e(LOG_TAG, "prepare() failed");
            }
        }
    
        private void stopPlaying() {
            mPlayer.release();
            mPlayer = null;
        }
    
        private void startRecording() {
            mRecorder = new MediaRecorder();
            mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
            mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
            mRecorder.setOutputFile(mFileName);
            mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
    
            try {
                mRecorder.prepare();
            } catch (IOException e) {
                Log.e(LOG_TAG, "prepare() failed");
            }
    
            mRecorder.start();
        }
    
        private void stopRecording() {
            mRecorder.stop();
            mRecorder.release();
            mRecorder = null;
        }
    
        class RecordButton extends Button {
            boolean mStartRecording = true;
    
            OnClickListener clicker = new OnClickListener() {
                public void onClick(View v) {
                    onRecord(mStartRecording);
                    if (mStartRecording) {
                        setText("Stop recording");
                    } else {
                        setText("Start recording");
                    }
                    mStartRecording = !mStartRecording;
                }
            };
    
            public RecordButton(Context ctx) {
                super(ctx);
                setText("Start recording");
                setOnClickListener(clicker);
            }
        }
    
        class PlayButton extends Button {
            boolean mStartPlaying = true;
    
            OnClickListener clicker = new OnClickListener() {
                public void onClick(View v) {
                    onPlay(mStartPlaying);
                    if (mStartPlaying) {
                        setText("Stop playing");
                    } else {
                        setText("Start playing");
                    }
                    mStartPlaying = !mStartPlaying;
                }
            };
    
            public PlayButton(Context ctx) {
                super(ctx);
                setText("Start playing");
                setOnClickListener(clicker);
            }
        }
    
        public MainActivity() {
         
         theDate date = new theDate();
         String sDate = date.curDate();
         String sTime = date.curTime();
            mFileName = Environment.getExternalStorageDirectory().getAbsolutePath();
            mFileName += "/TSP_Recordings/Date_"+sDate+"_Time_"+sTime+".3gp";
        }
    
        @Override
        public void onCreate(Bundle icicle) {
            super.onCreate(icicle);
            
            LinearLayout ll = new LinearLayout(this);
            mRecordButton = new RecordButton(this);
            ll.addView(mRecordButton,
                new LinearLayout.LayoutParams(
                    ViewGroup.LayoutParams.WRAP_CONTENT,
                    ViewGroup.LayoutParams.WRAP_CONTENT,
                    
                    0));
            mPlayButton = new PlayButton(this);
            ll.addView(mPlayButton,
                new LinearLayout.LayoutParams(
                    ViewGroup.LayoutParams.WRAP_CONTENT,
                    ViewGroup.LayoutParams.WRAP_CONTENT,
                    0));
            setContentView(ll);
        }
    
        @Override
        public void onPause() {
            super.onPause();
            if (mRecorder != null) {
                mRecorder.release();
                mRecorder = null;
            }
    
            if (mPlayer != null) {
                mPlayer.release();
                mPlayer = null;
            }
        }    
    }
    
    
    package com.tsop.tsp_recorder;
    
    import java.util.Calendar;
    
    public class theDate {
    static Calendar c = Calendar.getInstance();
    
    public static String curDate() {
         int month = c.get(Calendar.MONTH) + 1;
    String sDate = c.get(Calendar.DAY_OF_MONTH) + "-" 
    + month
    + "-" + c.get(Calendar.YEAR);
    return sDate;
         }
    
        public static String curTime() {
         String sTime = c.get(Calendar.HOUR_OF_DAY) 
    + "-" + c.get(Calendar.MINUTE) + "-"
    + c.get(Calendar.SECOND);
    return sTime;
         }
         
         public static long duration() {
         long dur = c.getTimeInMillis();
         return dur;
        }
    }
    I need to change it and make it messure the sound levels.I'll use the getMaxAmplitude method,but this method returns only the last result,before it was called.I think I should use a loop,but the start method is capturing and encoding continuously.
    How can I get the current amplitude,for example in a period of 1 second,on my recording?

    Thanks
    Last edited by xchris; 12-01-2013 at 05:09 AM.

  2. #2
    Member
    Join Date
    Nov 2013
    Posts
    4

    Original Poster
    I've edited my code to this :
    Code:
    package com.tsop.tsp_recorder;
    
    import android.R.layout;
    import android.app.Activity;
    import android.widget.HorizontalScrollView;
    import android.widget.LinearLayout;
    import android.widget.TextView;
    import android.os.Bundle;
    import android.os.Environment;
    import android.view.ViewGroup;
    import android.widget.Button;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.view.ViewGroup.MarginLayoutParams;
    import android.content.Context;
    import android.util.Log;
    import android.media.MediaRecorder;
    import android.media.MediaPlayer;
    
    import java.io.IOException;
    import java.util.Calendar;
    
    
    public class MainActivity extends Activity
    {	
    	private static final String LOG_TAG = "AudioRecordTest";
        private static String mFileName = null;
    
        private RecordButton mRecordButton = null;
        private MediaRecorder mRecorder = null;
    
        private PlayButton   mPlayButton = null;
        private MediaPlayer   mPlayer = null;
        
        public int currentAmplitude;
    
        private void onRecord(boolean start) {
        	if (start) {
                startRecording();     
            } else {
                stopRecording();
            }
        }
    
        private void onPlay(boolean start) {
            if (start) {
                startPlaying();
            } else {
                stopPlaying();
            }
        }
    
        private void startPlaying() {
            mPlayer = new MediaPlayer();
            try {
                mPlayer.setDataSource(mFileName);
                mPlayer.prepare();
                mPlayer.start();
            } catch (IOException e) {
                Log.e(LOG_TAG, "prepare() failed");
            }
        }
    
        private void stopPlaying() {
            mPlayer.release();
            mPlayer = null;
        }
    
        private void startRecording() {
            mRecorder = new MediaRecorder();
            mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
            mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
            mRecorder.setOutputFile(mFileName);
            mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
    
            try {
                mRecorder.prepare();
            } catch (IOException e) {
                Log.e(LOG_TAG, "prepare() failed");
            }
    
            mRecorder.start();
            getAmplitude();
        }
    
        private void stopRecording() {
            mRecorder.stop();
            mRecorder.release();
            mRecorder = null;
        }
        
        public double getAmplitude() {
            if (mRecorder != null) {
            	currentAmplitude = mRecorder.getMaxAmplitude();
                return  currentAmplitude;
            }
            else
                    return 0;
    }
    
        class RecordButton extends Button {
            boolean mStartRecording = true;
    
            OnClickListener clicker = new OnClickListener() {
                public void onClick(View v) {
                    onRecord(mStartRecording);
                    if (mStartRecording) {
                        setText("Stop recording");
                    } else {
                        setText("Start recording");
                    }
                    mStartRecording = !mStartRecording;
                }
            };
    
            public RecordButton(Context ctx) {
                super(ctx);
                setText("Start recording");
                setOnClickListener(clicker);
            }
        }
    
        class PlayButton extends Button {
            boolean mStartPlaying = true;
    
            OnClickListener clicker = new OnClickListener() {
                public void onClick(View v) {
                    onPlay(mStartPlaying);
                    if (mStartPlaying) {
                        setText("Stop playing");
                    } else {
                        setText("Start playing");
                    }
                    mStartPlaying = !mStartPlaying;
                }
            };
    
            public PlayButton(Context ctx) {
                super(ctx);
                setText("Start playing");
                setOnClickListener(clicker);
            }
        }
    
        public MainActivity() {
        	
        	theDate date = new theDate();
        	String sDate = date.curDate();
        	String sTime = date.curTime();
            mFileName = Environment.getExternalStorageDirectory().getAbsolutePath();
            mFileName += "/TSP_Recordings/Date_"+sDate+"_Time_"+sTime+".3gp";
        }
    
        @Override
        public void onCreate(Bundle icicle) {
            super.onCreate(icicle);
            
            LinearLayout ll = new LinearLayout(this);
            mRecordButton = new RecordButton(this);
            ll.addView(mRecordButton,
                new LinearLayout.LayoutParams(
                    ViewGroup.LayoutParams.WRAP_CONTENT,
                    ViewGroup.LayoutParams.WRAP_CONTENT,
                    
                    0));
            mPlayButton = new PlayButton(this);
            ll.addView(mPlayButton,
                new LinearLayout.LayoutParams(
                    ViewGroup.LayoutParams.WRAP_CONTENT,
                    ViewGroup.LayoutParams.WRAP_CONTENT,
                    0));
            TextView tv = new TextView(this);
            ll.addView(tv,
                    new LinearLayout.LayoutParams(
                        ViewGroup.LayoutParams.WRAP_CONTENT,
                        ViewGroup.LayoutParams.WRAP_CONTENT,
                        0));
            tv.setText(Integer.toString(currentAmplitude));
            setContentView(ll);
        }
    
        @Override
        public void onPause() {
            super.onPause();
            if (mRecorder != null) {
                mRecorder.release();
                mRecorder = null;
            }
    
            if (mPlayer != null) {
                mPlayer.release();
                mPlayer = null;
            }
        }    
    }
    But it returns 0 everytime.Any ideas?



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