/*
This file is part of Peers, a java SIP softphone.
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 3 of the License, or
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, see <http://www.gnu.org/licenses/>.
Copyright 2010 Yohann Martineau
*/
package net.sourceforge.peers.media;
import java.util.ArrayList;
import java.util.List;
import net.sourceforge.peers.rtp.RFC4733;
import net.sourceforge.peers.rtp.RtpPacket;
public class DtmfFactory {
public List<RtpPacket> createDtmfPackets(char digit) {
List<RtpPacket> packets = new ArrayList<RtpPacket>();
byte[] data = new byte[4];
// RFC4733
if (digit == '*') {
data[0] = 10;
} else if (digit == '#') {
data[0] = 11;
} else if (digit >= 'A' && digit <= 'D') {
data[0] = (byte) (digit - 53);
} else {
data[0] = (byte) (digit - 48);
}
data[1] = 10; // volume 10
// Set Duration to 160
// duration 8 bits
data[2] = 0;
// duration 8 bits
data[3] = -96;
RtpPacket rtpPacket = new RtpPacket();
rtpPacket.setData(data);
rtpPacket.setPayloadType(RFC4733.PAYLOAD_TYPE_TELEPHONE_EVENT);
rtpPacket.setMarker(true);
packets.add(rtpPacket);
// two classical packets
rtpPacket = new RtpPacket();
// set duration to 320
data = data.clone();
data[2] = 1;
data[3] = 64;
rtpPacket.setData(data);
rtpPacket.setMarker(false);
rtpPacket.setPayloadType(RFC4733.PAYLOAD_TYPE_TELEPHONE_EVENT);
packets.add(rtpPacket);
rtpPacket = new RtpPacket();
// set duration to 320
data = data.clone();
data[2] = 1;
data[3] = -32;
rtpPacket.setData(data);
rtpPacket.setMarker(false);
rtpPacket.setPayloadType(RFC4733.PAYLOAD_TYPE_TELEPHONE_EVENT);
packets.add(rtpPacket);
data = data.clone();
// create three end event packets
data[1] = -0x76; // end event flag + volume set to 10
// set Duration to 640
data[2] = 2; // duration 8 bits
data[3] = -128; // duration 8 bits
for (int r = 0; r < 3; r++) {
rtpPacket = new RtpPacket();
rtpPacket.setData(data);
rtpPacket.setMarker(false);
rtpPacket.setPayloadType(RFC4733.PAYLOAD_TYPE_TELEPHONE_EVENT);
packets.add(rtpPacket);
}
return packets;
}
}