/*
 * Copyright (C) 2009 The Sipdroid Open Source Project
 * Copyright (C) 2005 Luca Veltri - University of Parma - Italy
 * 
 * This file is part of Sipdroid (http://www.sipdroid.org)
 * 
 * Sipdroid is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this source code; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package org.sipdroid.media;

import java.io.InputStream;
import java.net.DatagramPacket;
import java.util.Random;

import jlibrtp.RTPSession;
import jlibrtp.RtpPkt;

import org.sipdroid.media.codecs.Codec;

import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioRecord;
import android.media.MediaRecorder;

/**
 * RtpStreamSender is a generic stream sender. It takes an InputStream and sends
 * it through RTP.
 */
public class RtpStreamSender extends Thread{

	private static final boolean DEBUG = true;

	/** The RtpSocket */
	private RTPSession rtpSession = null;

	/** Codec */
	private Codec codec;

	private int sampling_rate;

	/** Number of bytes per frame */
	private int frame_size;

	private int codec_frame_size;

	/**
	 * Whether it works synchronously with a local clock, or it it acts as slave
	 * of the InputStream
	 */
	boolean do_sync = true;

	int sync_adj = 0;

	/** Whether it is running */
	boolean running = false;
	boolean muted = false;

	private int codec_divider;

	/**
	 * Constructs a RtpStreamSender.
	 * 
	 */
	public RtpStreamSender(Codec co, RTPSession rtpSession) {
		init(co, rtpSession);
	}

	/** Inits the RtpStreamSender */
	private void init(Codec co,	RTPSession rtpSession) {
		this.rtpSession = rtpSession;
		codec = co;
		sampling_rate = codec.getInfo().samplingRate;
		codec_frame_size = codec.getInfo().codecFrameSize;
		codec_divider = codec.getInfo().rtpSampleDivider;
		frame_size = 160 * codec_divider;
		rtpSession.payloadType(codec.getInfo().rtpPayloadCode);

		this.do_sync = true;
	}

	/** Sets the synchronization adjustment time (in milliseconds). */
	public void setSyncAdj(int millisecs) {
		sync_adj = millisecs;
	}

	/** Whether is running */
	public boolean isRunning() {
		return running;
	}

	public boolean mute() {
		return muted = !muted;
	}

	public static int delay = 0;

	/** Stops running */
	public void halt() {
		running = false;
	}

	Random random;
	double smin = 200,s;
	int nearend;

	void calc(short[] lin,int off,int len) {
		int i,j;
		double sm = 30000,r;

		for (i = 0; i < len; i += 5) {
			j = lin[i+off];
			s = 0.03*Math.abs(j) + 0.97*s;
			if (s < sm) sm = s;
			if (s > smin) nearend = 3000/5;
			else if (nearend > 0) nearend--;
		}
		for (i = 0; i < len; i++) {
			j = lin[i+off];
			if (j > 6550)
				lin[i+off] = 6550*5;
			else if (j < -6550)
				lin[i+off] = -6550*5;
			else
				lin[i+off] = (short)(j*5);
		}
		r = (double)len/100000;
		smin = sm*r + smin*(1-r);
	}

	void noise(short[] lin,int off,int len,double power) {
		int i,r = (int)(power*2);
		short ran;

		if (r == 0) r = 1;
		for (i = 0; i < len; i += 4) {
			ran = (short)(random.nextInt(r*2)-r);
			lin[i+off] = ran;
			lin[i+off+1] = ran;
			lin[i+off+2] = ran;
			lin[i+off+3] = ran;
		}
	}

	public static int m;

	/** Runs it in a new Thread. */
	public void run() {
		if (rtpSession == null)
			return;
		byte[] buffer = new byte[codec_frame_size + 12];
		DatagramPacket packet = new DatagramPacket(buffer, codec_frame_size + 12);
		RtpPkt pkt = new RtpPkt();
		pkt.setRawPkt(buffer);
		pkt.setPayloadType(codec.getInfo().rtpPayloadCode);
		int seqn = 0;
		long time = 0;
		double p = 0;
		running = true;
		m = 1;

		if (DEBUG)
			println("Reading blocks of " + buffer.length + " bytes");

		android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_URGENT_AUDIO);

		Codec.Context codecCtx = codec.initEncoder();

		AudioRecord record = new AudioRecord(MediaRecorder.AudioSource.MIC, sampling_rate, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT, 
				AudioRecord.getMinBufferSize(sampling_rate, 
						AudioFormat.CHANNEL_CONFIGURATION_MONO, 
						AudioFormat.ENCODING_PCM_16BIT)*2);
		record.startRecording();
		short[] lin = new short[frame_size*11];
		int num,ring = 0;
		random = new Random();
		while (running) {
			num = record.read(lin,(ring+delay)%(frame_size*11),frame_size);
			if (RtpStreamReceiver.speakermode == AudioManager.MODE_NORMAL) {
				calc(lin,(ring+delay)%(frame_size*11),num);
				if (RtpStreamReceiver.nearend != 0)
					noise(lin,(ring+delay)%(frame_size*11),num,p);
				else if (nearend == 0)
					p = 0.9*p + 0.1*s;
			}
			codec.encode(codecCtx, lin, ring%(frame_size*11), frame_size, buffer, 12);
			ring += frame_size;
			rtpSession.sendData(packet, pkt);
			if (m == 2) {
				rtpSession.sendData(packet, pkt);
				println("retransmit");
			}
			seqn++;
			time += num;
		}
		record.stop();
		rtpSession = null;
		codec.cleanEncoder(codecCtx);
		if (DEBUG)
			println("rtp sender terminated");
	}

	/** Debug output */
	private static void println(String str) {
		android.util.Log.d("DEBUG","RtpStreamSender: " + str);
	}
}