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/*
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* Copyright (C) 2009 The Sipdroid Open Source Project
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* Copyright (C) 2005 Luca Veltri - University of Parma - Italy
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*
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* This file is part of Sipdroid (http://www.sipdroid.org)
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*
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* Sipdroid is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This source code is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this source code; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package org.sipdroid.net;
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import com.beem.project.beem.utils.Random;
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/**
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* RtpPacket implements a RTP packet.
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*/
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public class RtpPacket {
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/* RTP packet buffer containing both the RTP header and payload */
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byte[] packet;
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/* RTP packet length */
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int packet_len;
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/* RTP header length */
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// int header_len;
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/** Gets the RTP packet */
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public byte[] getPacket() {
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return packet;
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}
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/** Gets the RTP packet length */
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public int getLength() {
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return packet_len;
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}
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/** Gets the RTP header length */
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public int getHeaderLength() {
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if (packet_len >= 12)
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return 12 + 4 * getCscrCount();
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else
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return packet_len; // broken packet
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}
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/** Gets the RTP header length */
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public int getPayloadLength() {
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if (packet_len >= 12)
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return packet_len - getHeaderLength();
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else
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return 0; // broken packet
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}
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/** Sets the RTP payload length */
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public void setPayloadLength(int len) {
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packet_len = getHeaderLength() + len;
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}
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// version (V): 2 bits
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// padding (P): 1 bit
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// extension (X): 1 bit
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// CSRC count (CC): 4 bits
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// marker (M): 1 bit
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// payload type (PT): 7 bits
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// sequence number: 16 bits
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// timestamp: 32 bits
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// SSRC: 32 bits
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// CSRC list: 0 to 15 items, 32 bits each
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/** Gets the version (V) */
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public int getVersion() {
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if (packet_len >= 12)
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return (packet[0] >> 6 & 0x03);
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else
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return 0; // broken packet
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}
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/** Sets the version (V) */
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public void setVersion(int v) {
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if (packet_len >= 12)
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packet[0] = (byte) ((packet[0] & 0x3F) | ((v & 0x03) << 6));
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}
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/** Whether has padding (P) */
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public boolean hasPadding() {
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if (packet_len >= 12)
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return getBit(packet[0], 5);
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else
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return false; // broken packet
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}
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/** Set padding (P) */
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public void setPadding(boolean p) {
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if (packet_len >= 12)
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packet[0] = setBit(p, packet[0], 5);
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}
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/** Whether has extension (X) */
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public boolean hasExtension() {
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if (packet_len >= 12)
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return getBit(packet[0], 4);
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else
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return false; // broken packet
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}
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/** Set extension (X) */
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public void setExtension(boolean x) {
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if (packet_len >= 12)
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packet[0] = setBit(x, packet[0], 4);
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}
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/** Gets the CSCR count (CC) */
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public int getCscrCount() {
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if (packet_len >= 12)
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return (packet[0] & 0x0F);
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else
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return 0; // broken packet
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}
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/** Whether has marker (M) */
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public boolean hasMarker() {
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if (packet_len >= 12)
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return getBit(packet[1], 7);
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else
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return false; // broken packet
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}
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/** Set marker (M) */
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public void setMarker(boolean m) {
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if (packet_len >= 12)
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packet[1] = setBit(m, packet[1], 7);
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}
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/** Gets the payload type (PT) */
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public int getPayloadType() {
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if (packet_len >= 12)
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return (packet[1] & 0x7F);
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else
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return -1; // broken packet
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}
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/** Sets the payload type (PT) */
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public void setPayloadType(int pt) {
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if (packet_len >= 12)
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packet[1] = (byte) ((packet[1] & 0x80) | (pt & 0x7F));
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}
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/** Gets the sequence number */
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public int getSequenceNumber() {
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if (packet_len >= 12)
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return getInt(packet, 2, 4);
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else
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return 0; // broken packet
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}
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/** Sets the sequence number */
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public void setSequenceNumber(int sn) {
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if (packet_len >= 12)
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setInt(sn, packet, 2, 4);
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}
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/** Gets the timestamp */
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public long getTimestamp() {
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if (packet_len >= 12)
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return getLong(packet, 4, 8);
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else
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return 0; // broken packet
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}
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/** Sets the timestamp */
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public void setTimestamp(long timestamp) {
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if (packet_len >= 12)
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setLong(timestamp, packet, 4, 8);
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}
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/** Gets the SSCR */
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public long getSscr() {
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if (packet_len >= 12)
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return getLong(packet, 8, 12);
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else
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return 0; // broken packet
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}
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/** Sets the SSCR */
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public void setSscr(long ssrc) {
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if (packet_len >= 12)
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setLong(ssrc, packet, 8, 12);
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}
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/** Gets the CSCR list */
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public long[] getCscrList() {
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int cc = getCscrCount();
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long[] cscr = new long[cc];
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for (int i = 0; i < cc; i++)
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cscr[i] = getLong(packet, 12 + 4 * i, 16 + 4 * i);
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return cscr;
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}
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/** Sets the CSCR list */
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public void setCscrList(long[] cscr) {
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if (packet_len >= 12) {
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int cc = cscr.length;
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if (cc > 15)
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cc = 15;
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packet[0] = (byte) (((packet[0] >> 4) << 4) + cc);
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cscr = new long[cc];
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for (int i = 0; i < cc; i++)
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setLong(cscr[i], packet, 12 + 4 * i, 16 + 4 * i);
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// header_len=12+4*cc;
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}
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}
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/** Sets the payload */
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public void setPayload(byte[] payload, int len) {
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if (packet_len >= 12) {
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int header_len = getHeaderLength();
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for (int i = 0; i < len; i++)
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packet[header_len + i] = payload[i];
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packet_len = header_len + len;
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}
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}
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/** Gets the payload */
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public byte[] getPayload() {
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int header_len = getHeaderLength();
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int len = packet_len - header_len;
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byte[] payload = new byte[len];
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for (int i = 0; i < len; i++)
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payload[i] = packet[header_len + i];
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return payload;
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}
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/** Creates a new RTP packet */
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public RtpPacket(byte[] buffer, int packet_length) {
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packet = buffer;
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packet_len = packet_length;
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if (packet_len < 12)
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packet_len = 12;
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init(0x0F);
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}
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/** init the RTP packet header (only PT) */
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public void init(int ptype) {
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init(ptype, Random.nextLong());
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}
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/** init the RTP packet header (PT and SSCR) */
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public void init(int ptype, long sscr) {
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init(ptype, Random.nextInt(), Random.nextLong(), sscr);
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}
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/** init the RTP packet header (PT, SQN, TimeStamp, SSCR) */
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public void init(int ptype, int seqn, long timestamp, long sscr) {
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setVersion(2);
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setPayloadType(ptype);
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setSequenceNumber(seqn);
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setTimestamp(timestamp);
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setSscr(sscr);
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}
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// *********************** Private and Static ***********************
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/** Gets int value */
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private static int getInt(byte b) {
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return ((int) b + 256) % 256;
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}
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/** Gets long value */
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private static long getLong(byte[] data, int begin, int end) {
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long n = 0;
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for (; begin < end; begin++) {
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n <<= 8;
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n += data[begin];
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}
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return n;
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}
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/** Sets long value */
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private static void setLong(long n, byte[] data, int begin, int end) {
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for (end--; end >= begin; end--) {
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data[end] = (byte) (n % 256);
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n >>= 8;
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}
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}
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/** Gets Int value */
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private static int getInt(byte[] data, int begin, int end) {
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return (int) getLong(data, begin, end);
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}
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/** Sets Int value */
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private static void setInt(int n, byte[] data, int begin, int end) {
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setLong(n, data, begin, end);
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}
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/** Gets bit value */
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private static boolean getBit(byte b, int bit) {
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return (b >> bit) == 1;
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}
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/** Sets bit value */
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private static byte setBit(boolean value, byte b, int bit) {
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if (value)
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return (byte) (b | (1 << bit));
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else
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return (byte) ((b | (1 << bit)) ^ (1 << bit));
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}
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}
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