Android AudioRecord with CHANNEL_IN_STEREO read raw Audio buffer resulted in mixed Left and Right audio

Question

I am trying to record an audio with CHANNEL_IN_STEREO configuration in which I am telling audio recorded to record audio in two channel. But after storing buffer array from recorder Audio left channel and right channel is resulting as mix. I cannot separate Audio Left channel and Right channel.

Below is code written for same :

import androidx.appcompat.app.AppCompatActivity;

import android.media.AudioFormat;
import android.media.AudioRecord;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;

    import java.io.ByteArrayOutputStream;
    import java.io.DataOutputStream;
    import java.io.File;
    import java.io.FileNotFoundException;
    import java.io.FileOutputStream;
    import java.io.IOException;
    
    public class MainActivity extends AppCompatActivity {
        AudioRecord record;
        Boolean status = true;
        private int sampleRate = 44100;
        private int channelConfig = AudioFormat.CHANNEL_IN_STEREO;
        private int audioFormat = AudioFormat.ENCODING_PCM_16BIT;
        int minBufSize = AudioRecord.getMinBufferSize(sampleRate, channelConfig, audioFormat);
        byte buffer[] = new byte[8916];
        ByteArrayOutputStream leftbaos;
        ByteArrayOutputStream rightbaos;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            Button start = findViewById(R.id.start);
            Button stop = findViewById(R.id.stop);
            leftbaos = new ByteArrayOutputStream();
            rightbaos = new ByteArrayOutputStream();
            start.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    startRecorder();
                }
            });
    
            stop.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    stopRecorder();
    
                }
            });
        }
    
        private void startRecorder() {
            status = true;
            record = new AudioRecord(MediaRecorder.AudioSource.MIC, sampleRate, channelConfig, audioFormat, minBufSize);
            Thread streamThread = new Thread(new Runnable() {
    
                @Override
                public void run() {
                    try {
    
    
                        record.startRecording();
                        while (status == true) {
    
                            int recorded_int  = record.read(buffer, 0, minBufSize);
                            byte leftChannelAudioData[] = new byte[buffer.length/2];
                            byte rightChannelAudioData[] = new byte[buffer.length/2];
                            for(int i = 0; i < buffer.length/2; i = i + 1)
                            {
                                leftChannelAudioData[i] = buffer[2*i];
                                rightChannelAudioData[i] =  buffer[2*i+1];
    
                            }
                            leftbaos.write(leftChannelAudioData,0,recorded_int/2);
                            rightbaos.write(rightChannelAudioData,0,recorded_int/2);
    
    
                        }
    
                    } catch(Exception e) {
                    }
                }
            });
            streamThread.start();
        }
        private void stopRecorder() {
            status = false;
            if(record!= null) {
                //storing left channel audio
                send(leftbaos,"/mydirectory/left.pcm");
                //storing right channel audio
                send(rightbaos,"/mydirectory/right.pcm");
                record.stop();
                record.release();
            }
        }
    
        private void send(ByteArrayOutputStream baos,String path) {
            File file = new File(path);
    
    
            try {
                FileOutputStream out = new FileOutputStream(file);
                baos.writeTo(out);
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    
    
    
    }

I have Used below mentioned permission

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />

In above code I am storing ByteArrayOutputStream in PCM file once recording gets stopped. How can I separate Audio Left channel and Right channel from Audio Record.

Answer 1

Waitting for answers