/*
/ Copyright (C) 2009 Risto Känsäkoski- Sesca ISW Ltd
/
/ This file is part of SIP-Applet (www.sesca.com, www.purplescout.com)
/
/ This program 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 2
/ of the License, or (at your option) any later version.
/
/ This program 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 program; if not, write to the Free Software
/ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package com.sesca.audio;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.util.Random;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import com.sesca.misc.Logger;
public class PCMUCodec3 implements AudioTranscoder
{
static int MuLawDecompressTable[] = {-32124, -31100, -30076, -29052, -28028, -27004, -25980, -24956, -23932, -22908, -21884, -20860, -19836, -18812, -17788, -16764, -15996, -15484, -14972, -14460, -13948, -13436, -12924, -12412, -11900, -11388, -10876, -10364, -9852, -9340, -8828, -8316, -7932, -7676, -7420, -7164, -6908, -6652, -6396, -6140, -5884, -5628, -5372, -5116, -4860, -4604, -4348, -4092, -3900, -3772, -3644, -3516, -3388, -3260, -3132, -3004, -2876, -2748, -2620, -2492, -2364, -2236, -2108, -1980, -1884, -1820, -1756, -1692, -1628, -1564, -1500, -1436, -1372, -1308, -1244, -1180, -1116, -1052, -988, -924, -876, -844, -812, -780, -748, -716, -684, -652, -620, -588, -556, -524, -492, -460, -428, -396, -372, -356, -340, -324, -308, -292, -276, -260, -244, -228, -212, -196, -180, -164, -148, -132, -120, -112, -104, -96, -88, -80, -72, -64, -56, -48, -40, -32, -24, -16, -8, 0, 32124, 31100, 30076, 29052, 28028, 27004, 25980, 24956, 23932, 22908, 21884, 20860, 19836, 18812, 17788, 16764, 15996, 15484, 14972, 14460, 13948, 13436, 12924, 12412, 11900, 11388, 10876, 10364, 9852, 9340, 8828, 8316, 7932, 7676, 7420, 7164, 6908, 6652, 6396, 6140, 5884, 5628, 5372, 5116, 4860, 4604, 4348, 4092, 3900, 3772, 3644, 3516, 3388, 3260, 3132, 3004, 2876, 2748, 2620, 2492, 2364, 2236, 2108, 1980, 1884, 1820, 1756, 1692, 1628, 1564, 1500, 1436, 1372, 1308, 1244, 1180, 1116, 1052, 988, 924, 876, 844, 812, 780, 748, 716, 684, 652, 620, 588, 556, 524, 492, 460, 428, 396, 372, 356, 340, 324, 308, 292, 276, 260, 244, 228, 212, 196, 180, 164, 148, 132, 120, 112, 104, 96, 88, 80, 72, 64, 56, 48, 40, 32, 24, 16, 8, 0};
// private int[] pseudoByteFrame =
// {0xdb,0xbf,0xb7,0xb1,0xaf,0xb0,0xb4,0xbd,0xcd,0x5c,0x43,0x37,0x32,0x2f,0x2f,0x34,0x3b,0x4d,0xeb,0xc3,0xb9,0xb2,0xaf,0xaf,0xb3,0xbb,0xc8,0x6d,0x47,0x39,0x33,0x2f,0x2f,0x33,0x39,0x48,0x71,0xc8,0xbb,0xb3,0xaf,0xaf,0xb2,0xb9,0xc4,0xee,0x4c,0x3b,0x34,0x2f,0x2f,0x32,0x38,0x43,0x5e,0xcc,0xbd,0xb4,0xb0,0xaf,0xb1,0xb7,0xbf,0xdd,0x52,0x3d,0x36,0x30,0x2f,0x31,0x36,0x3f,0x54,0xd3,0xbf,0xb6,0xb1,0xaf,0xb0,0xb6,0xbd,0xd3,0x5c,0x3f,0x37,0x31,0x2f,0x30,0x34,0x3d,0x4d,0xdc,0xc3,0xb7,0xb2,0xaf,0xaf,0xb4,0xbb,0xcd,0x6b,0x43,0x39,0x32,0x2f,0x2f,0x33,0x3b,0x48,0xed,0xc7,0xb9,0xb3,0xaf,0xaf,0xb3,0xb9,0xc8,0xf0,0x48,0x3b,0x33,0x2f,0x2f,0x32,0x39,0x44,0x6e,0xcc,0xbb,0xb4,0xaf,0xaf,0xb2,0xb8,0xc3,0xde,0x4c,0x3d,0x34,0x30,0x2f,0x31,0x37,0x3f,0x5d,0xd2,0xbd,0xb6,0xb0,0xaf,0xb1,0xb6,0xbf,0xd4,0x53,0x3f,0x36,0x31,0x2f};
// private int[] pseudoByteSilenceFrame =
// {0xff,0x7f,0xff,0x7f,0xff,0xff,0x7f,0xff,0xff,0x7f,0xff,0x7f,0xff,0xff,0x7f,0xff,0xff,0xff,0xff,0xff,0x7f,0xff,0x7f,0xff,0xff,0xff,0xff,0xff,0x7f,0xff,0x7f,0xff,0xff,0x7f,0xff,0x7f,0xff,0xff,0x7f,0xff,0x7f,0xff,0x7f,0xff,0x7f,0xff,0xff,0x7f,0xff,0x7f,0xff,0xff,0xff,0x7f,0xff,0x7f,0xff,0x7f,0x7f,0xff,0xff,0xff,0xff,0x7f,0xff,0xff,0xff,0x7f,0xff,0x7f,0xff,0x7f,0xff,0xff,0x7f,0xff,0x7f,0xff,0xff,0xff,0x7f,0xff,0xff,0xff,0xff,0xff,0x7f,0xff,0x7f,0xff,0xff,0xff,0x7f,0xff,0x7f,0xff,0xff,0x7f,0x7f,0xff,0xff,0xff,0x7f,0xff,0xff,0xff,0x7f,0xff,0xff,0xff,0x7f,0x7f,0xff,0x7f,0xff,0x7f,0xff,0xff,0xff,0xff,0xff,0x7f,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x7f,0x7f,0xff,0xff,0xff,0x7f,0xff,0xff,0xff,0xff,0xff,0x7f,0xff,0x7f,0xff,0xff,0x7f,0xff,0x7f,0x7f,0xff,0xff,0xff,0xff,0x7f,0xff,0xff,0xff,0xff,0xff,0xff};
// private byte[] silentFrame = new byte[160];
// for speech analysis
int[] taulu = new int[256];
int[] mkeys = {-1, -1, -1, -1, -1, -1, -1, -1};
int[] mvalues = {-1, -1, -1, -1, -1, -1, -1, -1};
int pnum = 0;
// long psstart=0;
int psilence = 0;
int ptotal = 0;
int pwin = 12; // number of packets in analyze window. Default 12 = 240 ms
// (with usual packet length)
long plen = 480; // time in ms to keep sending blocked when echo
// cancellation becomes active. Default=480
int silenceThreshold = 35; // Silence threshold. Default 35% = when 35% of
// analyze window is silence the window is
// considered silent.
private ByteArrayInputStream byteStream;
private AudioInputStream rawStream;
private AudioInputStream encodedStream;
AudioFormat sourceFormat = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED, 8000, 16, 1, 2, 8000, false);
AudioFormat targetFormat = new AudioFormat(AudioFormat.Encoding.ULAW, 8000, 8, 1, 1, 8000, false);
AudioTranscoderListener listener = null;
public byte[] encode(byte[] frame)
{
if(listener.getPseudoEchoCancellationMode() & isBlocked())
return whiteNoise(120, 124);
byteStream = new ByteArrayInputStream(frame);
rawStream = new AudioInputStream(byteStream, sourceFormat, frame.length / 2);
encodedStream = AudioSystem.getAudioInputStream(targetFormat, rawStream);
byte[] encodedFrame = new byte[frame.length / 2];
try
{
encodedStream.read(encodedFrame, 0, encodedFrame.length);
}
catch (IOException e)
{
e.printStackTrace();
}
return encodedFrame;
}
public boolean canEncode()
{
return true;
}
public boolean canDecode()
{
return true;
}
public boolean supportsSilenceSuppression()
{
return false;
}
public byte[] decode(byte[] b)
{
if (listener.getPseudoEchoCancellationMode()) analyze(b);
int j = 0;
byte[] decodedFrame = new byte[b.length * 2];
for (int i = 0; i < b.length; i++)
{
int x = b[i] & 0xFF;
int sample = MuLawDecompressTable[x];
decodedFrame[j] = (byte) (sample & 0xFF);
decodedFrame[j + 1] = (byte) (int) ((sample >> 8) & 0xFF);
j += 2;
}
Logger.hysteria("Decoding PCMU audio");
return decodedFrame;
}
public int getBitRate()
{
return 16;
}
public int getSampleRate()
{
return 8000;
}
public int getChannels()
{
return 1;
}
public int getFrameLength()
{
return 20;
}
public int getFrameSize()
{
return 160;
}
public int getPayloadType()
{
return 0;
}
public void init()
{
resetAnalysis();
}
void analyze(byte[] frame)
{
//TODO 402
}
private void resetAnalysis()
{
// for speech analysis
//TODO 403
}
public PCMUCodec3()
{
}
public PCMUCodec3(AudioTranscoderListener l)
{
listener = l;
}
public boolean supportsPseudoEchoCancellation()
{
return false;
}
private byte[] whiteNoise(int min, int max)
{
byte[] noise = new byte[160];
Random generator = new Random();
for (int i = 0; i < 160; i += 2)
{
int m1 = (generator.nextInt(max - min) + min + 1);
int m2 = m1 + 128;
noise[i] = (byte) (m1);
noise[i + 1] = (byte) (m2);
}
return noise;
}
private boolean isBlocked()
{
return false;
//TODO 404
}
}