package com.android.AudioRecord_Player;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import android.app.Activity;
import android.media.AudioFormat;
import android.media.AudioRecord;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageButton;
import android.widget.Toast;

public class AudioRecord_Player extends Activity implements OnClickListener{

	private static final int RECORDER_BPP = 16;
    private static final String AUDIO_RECORDER_FILE_EXT_WAV = ".wav";
    private static final String AUDIO_RECORDER_FOLDER = "AudioRecorder";
    private static final String AUDIO_RECORDER_TEMP_FILE = "record_temp.raw";
    private static final int RECORDER_SAMPLERATE = 8000;
    private static final int RECORDER_CHANNELS = AudioFormat.CHANNEL_IN_STEREO;
    private static final int RECORDER_AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT;

    private static final int AUDIO_SAMPLE_FREQ = 44100;
    private static final int AUDIO_BUFFER_SIZE = 200000;

    private AudioRecord recorder = null;
    private int bufferSize = 0;
    private Thread recordingThread = null;
    private boolean isRecording = false;

    ImageButton start_record,pause_rec,stop_rec,play_rec,resume_rec;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        start_record=(ImageButton)findViewById(R.id.rec);
        pause_rec=(ImageButton)findViewById(R.id.pause);
        resume_rec=(ImageButton)findViewById(R.id.resume);
        stop_rec=(ImageButton)findViewById(R.id.stop);
        play_rec=(ImageButton)findViewById(R.id.play);

        pause_rec.setEnabled(false);
        stop_rec.setEnabled(false);
        play_rec.setEnabled(false);
        resume_rec.setEnabled(false);

        bufferSize = AUDIO_BUFFER_SIZE;
//        AudioRecord.getMinBufferSize(RECORDER_SAMPLERATE,RECORDER_CHANNELS,RECORDER_AUDIO_ENCODING);

        start_record.setOnClickListener(this);
        pause_rec.setOnClickListener(this);
        stop_rec.setOnClickListener(this);
        play_rec.setOnClickListener(this);
        resume_rec.setOnClickListener(this);
    }

    private String getFilename(){
        String filepath = Environment.getExternalStorageDirectory().getPath();
        File file = new File(filepath,AUDIO_RECORDER_FOLDER);

        if(!file.exists()){
                file.mkdirs();
        }

        return (file.getAbsolutePath() + "/" + "Ravindra" + AUDIO_RECORDER_FILE_EXT_WAV);
   }

    private String getTempFilename(){
        String filepath = Environment.getExternalStorageDirectory().getPath();
        File file = new File(filepath,AUDIO_RECORDER_FOLDER);

        if(!file.exists()){
                file.mkdirs();
        }

        File tempFile = new File(filepath,AUDIO_RECORDER_TEMP_FILE);

        if(tempFile.exists())
                tempFile.delete();

        return (file.getAbsolutePath() + "/" + AUDIO_RECORDER_TEMP_FILE);
    }

    private void startRecording(){
    	//recorder = new AudioRecord(MediaRecorder.AudioSource.MIC,RECORDER_SAMPLERATE, RECORDER_CHANNELS,RECORDER_AUDIO_ENCODING, bufferSize);
    	recorder = new AudioRecord(MediaRecorder.AudioSource.MIC,
                AUDIO_SAMPLE_FREQ,
                AudioFormat.CHANNEL_CONFIGURATION_MONO,
                AudioFormat.ENCODING_PCM_16BIT,
                AUDIO_BUFFER_SIZE);

    	recorder.startRecording();

        isRecording = true;

        recordingThread = new Thread(new Runnable() {

                @Override
                public void run() {
                        writeAudioDataToFile();
                }
        },"AudioRecorder Thread");

        recordingThread.start();
    }

    private void stopRecording(boolean b){
        if(recorder != null){
                isRecording = false;

                recorder.stop();
                recorder.release();

                recorder = null;
                recordingThread = null;
        }

        copyWaveFile(getTempFilename(),getFilename(),b);
        deleteTempFile();
    }

    private void deleteTempFile() {
        File file = new File(getTempFilename());

        file.delete();
    }
    private void writeAudioDataToFile(){
        byte data[] = new byte[bufferSize];
        String filename = getTempFilename();
        FileOutputStream os = null;

        try {
                os = new FileOutputStream(filename);
        } catch (FileNotFoundException e) {
        	e.printStackTrace();
        }

        int read = 0;

        if(os != null){
                while(isRecording){
                        read = recorder.read(data, 0, bufferSize);

                        if(AudioRecord.ERROR_INVALID_OPERATION != read){
                                try {
                                        os.write(data);
                                } catch (IOException e) {
                                        e.printStackTrace();
                                }
                        }
                }

                try {
                        os.close();
                } catch (IOException e) {
                        e.printStackTrace();
                }
        }
   }

    private void copyWaveFile(String inFilename,String outFilename, boolean b){
        FileInputStream in = null;
        FileOutputStream out = null;
        long totalAudioLen = 0;
        long totalDataLen = totalAudioLen + 36;
        long longSampleRate = RECORDER_SAMPLERATE;
        int channels = 2;
        long byteRate = RECORDER_BPP * RECORDER_SAMPLERATE * channels/8;

        byte[] data = new byte[bufferSize];

        try {
                in = new FileInputStream(inFilename);
                out = new FileOutputStream(outFilename,b);
                totalAudioLen = in.getChannel().size();
                totalDataLen = totalAudioLen + 36;

                //AppLog.logString("File size: " + totalDataLen);

                WriteWaveFileHeader(out, totalAudioLen, totalDataLen,
                                longSampleRate, channels, byteRate);

                while(in.read(data) != -1){
                        out.write(data);
                }

                in.close();
                out.close();
        } catch (FileNotFoundException e) {
                e.printStackTrace();
        } catch (IOException e) {
                e.printStackTrace();
        }
   }


    private void WriteWaveFileHeader(
        FileOutputStream out, long totalAudioLen,
        long totalDataLen, long longSampleRate, int channels,
        long byteRate) throws IOException {

	    byte[] header = new byte[44];

	    header[0] = 'R';  // RIFF/WAVE header
	    header[1] = 'I';
	    header[2] = 'F';
	    header[3] = 'F';
	    header[4] = (byte) (totalDataLen & 0xff);
	    header[5] = (byte) ((totalDataLen >> 8) & 0xff);
	    header[6] = (byte) ((totalDataLen >> 16) & 0xff);
	    header[7] = (byte) ((totalDataLen >> 24) & 0xff);
	    header[8] = 'W';
	    header[9] = 'A';
	    header[10] = 'V';
	    header[11] = 'E';
	    header[12] = 'f';  // 'fmt ' chunk
	    header[13] = 'm';
	    header[14] = 't';
	    header[15] = ' ';
	    header[16] = 16;  // 4 bytes: size of 'fmt ' chunk
	    header[17] = 0;
	    header[18] = 0;
	    header[19] = 0;
	    header[20] = 1;  // format = 1
	    header[21] = 0;
	    header[22] = (byte) channels;
	    header[23] = 0;
	    header[24] = (byte) (longSampleRate & 0xff);
	    header[25] = (byte) ((longSampleRate >> 8) & 0xff);
	    header[26] = (byte) ((longSampleRate >> 16) & 0xff);
	    header[27] = (byte) ((longSampleRate >> 24) & 0xff);
	    header[28] = (byte) (byteRate & 0xff);
	    header[29] = (byte) ((byteRate >> 8) & 0xff);
	    header[30] = (byte) ((byteRate >> 16) & 0xff);
	    header[31] = (byte) ((byteRate >> 24) & 0xff);
	    header[32] = (byte) (2 * 16 / 8);  // block align
	    header[33] = 0;
	    header[34] = RECORDER_BPP;  // bits per sample
	    header[35] = 0;
	    header[36] = 'd';
	    header[37] = 'a';
	    header[38] = 't';
	    header[39] = 'a';
	    header[40] = (byte) (totalAudioLen & 0xff);
	    header[41] = (byte) ((totalAudioLen >> 8) & 0xff);
	    header[42] = (byte) ((totalAudioLen >> 16) & 0xff);
	    header[43] = (byte) ((totalAudioLen >> 24) & 0xff);

	    out.write(header, 0, 44);
	 }

	@Override
	public void onClick(View v) {
		// TODO Auto-generated method stub
		if(v==start_record)
		{
		  Toast.makeText(AudioRecord_Player.this, "Now Recording...", Toast.LENGTH_LONG).show();
		  startRecording();
		  start_record.setEnabled(false);
		  pause_rec.setEnabled(true);
	      stop_rec.setEnabled(true);

		}
		else if(v==stop_rec)
		{
		  Toast.makeText(AudioRecord_Player.this, "Recording Stopped...", Toast.LENGTH_LONG).show();
		  stopRecording(true);
		  start_record.setEnabled(true);
		  stop_rec.setEnabled(false);
		  pause_rec.setEnabled(false);

		}
		else if(v==pause_rec)
		{
		  Toast.makeText(AudioRecord_Player.this, "Pausing...", Toast.LENGTH_LONG).show();
		  stopRecording(false);
		  pause_rec.setEnabled(false);
		  resume_rec.setEnabled(true);

		}
		else if(v==play_rec)
		{
		  Toast.makeText(AudioRecord_Player.this, "Now Playing...", Toast.LENGTH_LONG).show();


		}
		else if(v==resume_rec)
		{
		  Toast.makeText(AudioRecord_Player.this, "Resuming...", Toast.LENGTH_LONG).show();
		  //recorder.startRecording();
		  startRecording();
		  start_record.setEnabled(false);
		  pause_rec.setEnabled(true);
	      stop_rec.setEnabled(true);


		}
	}
}