diff -r c9ff263c29ad -r e684f11070d5 src/jlibrtp/StaticProcs.java --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/jlibrtp/StaticProcs.java Sat Mar 14 22:15:41 2009 +0100 @@ -0,0 +1,270 @@ +/** + * Java RTP Library (jlibrtp) + * Copyright (C) 2006 Arne Kepp + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ +package jlibrtp; + +/** + * Generic functions for converting between unsigned integers and byte[]s. + * + * @author Arne Kepp + */ +public class StaticProcs { + + /** + * Converts an integer into an array of bytes. + * Primarily used for 16 bit unsigned integers, ignore the first two octets. + * + * @param i a 16 bit unsigned integer in an int + * @return byte[2] representing the integer as unsigned, most significant bit first. + */ + public static byte[] uIntIntToByteWord(int i) { + byte[] byteWord = new byte[2]; + byteWord[0] = (byte) ((i >> 8) & 0x000000FF); + byteWord[1] = (byte) (i & 0x00FF); + return byteWord; + } + + /** + * Converts an unsigned 32 bit integer, stored in a long, into an array of bytes. + * + * @param j a long + * @return byte[4] representing the unsigned integer, most significant bit first. + */ + public static byte[] uIntLongToByteWord(long j) { + int i = (int) j; + byte[] byteWord = new byte[4]; + byteWord[0] = (byte) ((i >>> 24) & 0x000000FF); + byteWord[1] = (byte) ((i >> 16) & 0x000000FF); + byteWord[2] = (byte) ((i >> 8) & 0x000000FF); + byteWord[3] = (byte) (i & 0x00FF); + return byteWord; + } + + /** + * Combines two bytes (most significant bit first) into a 16 bit unsigned integer. + * + * @param index of most significant byte + * @return int with the 16 bit unsigned integer + */ + public static int bytesToUIntInt(byte[] bytes, int index) { + int accum = 0; + int i = 1; + for (int shiftBy = 0; shiftBy < 16; shiftBy += 8 ) { + accum |= ( (long)( bytes[index + i] & 0xff ) ) << shiftBy; + i--; + } + return accum; + } + + /** + * Combines four bytes (most significant bit first) into a 32 bit unsigned integer. + * + * @param bytes + * @param index of most significant byte + * @return long with the 32 bit unsigned integer + */ + public static long bytesToUIntLong(byte[] bytes, int index) { + long accum = 0; + int i = 3; + for (int shiftBy = 0; shiftBy < 32; shiftBy += 8 ) { + accum |= ( (long)( bytes[index + i] & 0xff ) ) << shiftBy; + i--; + } + return accum; + } + + /** + * Converts an arbitrary number of bytes, assumed to represent an unsigned integer, + * to a Java long + */ + /*public static long bytesToUintLong(byte[] bytes, int firstByte, int lastByte) { + long accum = 0; + int i = lastByte - firstByte; + if(i > 7) { + System.out.println("!!!! StaticProcs.bytesToUintLong() Can't convert more than 63 bits!"); + return -1; + } + int stop = (i+1)*8; + + for (int shiftBy = 0; shiftBy < stop; shiftBy += 8 ) { + accum |= ( (long)( bytes[firstByte + i] & 0xff ) ) << shiftBy; + i--; + } + return accum; + }*/ + + /** + * Converts an arbitrary number of bytes, assumed to represent an unsigned integer, + * to a Java int + */ + /* public static int bytesToUintInt(byte[] bytes, int firstByte, int lastByte) { + int accum = 0; + int i = lastByte - firstByte; + if(i > 3) { + System.out.println("!!!! StaticProcs.bytesToUintLong() Can't convert more than 31 bits!"); + return -1; + } + int stop = (i+1)*8; + + for (int shiftBy = 0; shiftBy < stop; shiftBy += 8 ) { + accum |= ( (long)( bytes[firstByte + i] & 0xff ) ) << shiftBy; + i--; + } + return accum; + }*/ + + /** + * Recreates a UNIX timestamp based on the NTP representation used + * in RTCP SR packets + * + * @param ntpTs1 from RTCP SR packet + * @param ntpTs2 from RTCP SR packet + * @return the UNIX timestamp + */ + public static long undoNtpMess(long ntpTs1, long ntpTs2) { + long timeVal = (ntpTs1 - 2208988800L)*1000; + + double tmp = (1000.0*(double)ntpTs2)/((double)4294967295L); + long ms = (long) tmp; + //System.out.println(" timeVal: " +Long.toString(timeVal)+ " ms " + Long.toString(ms)); + timeVal += ms; + + return timeVal; + } + + + + /** + * Get the bits of a byte + * + * @param aByte the byte you wish to convert + * @return a String of 1's and 0's + */ + public static String bitsOfByte(byte aByte) { + int temp; + String out = ""; + for(int i=7; i>=0; i--) { + temp = (aByte >>> i); + temp &= 0x0001; + out += (""+temp); + } + return out; + } + + /** + * Get the hex representation of a byte + * + * @param aByte the byte you wish to convert + * @return a String of two chars 0-1,A-F + */ + public static String hexOfByte(byte aByte) { + String out = ""; + + for(int i=0; i<2; i++) { + int temp = (int) aByte; + if(temp < 0) { + temp +=256; + } + if(i == 0) { + temp = temp/16; + } else { + temp = temp%16; + } + + if( temp > 9) { + switch(temp) { + case 10: out += "A"; break; + case 11: out += "B"; break; + case 12: out += "C"; break; + case 13: out += "D"; break; + case 14: out += "E"; break; + case 15: out += "F"; break; + } + } else { + out += Integer.toString(temp); + } + } + return out; + } + + /** + * Get the hex representation of a byte + * + * @param hex 4 bytes the byte you wish to convert + * @return a String of two chars 0-1,A-F + */ + public static byte byteOfHex(byte[] hex) { + byte retByte = 0; + Byte tmp; + int val = 0; + + // First 4 bits + tmp = hex[0]; + val = tmp.intValue(); + if(val > 64) { + // Letter + val -= 55; + } else { + // Number + val -= 48; + } + retByte = ((byte) (val << 4)); + + // Last 4 bits + tmp = hex[1]; + val = tmp.intValue(); + if(val > 64) { + // Letter + val -= 55; + } else { + // Number + val -= 48; + } + retByte |= ((byte) val); + + return retByte; + } + + + /** + * Print the bits of a byte to standard out. For debugging. + * + * @param aByte the byte you wish to print out. + */ + public static void printBits(byte aByte) { + int temp; + for(int i=7; i>=0; i--) { + temp = (aByte >>> i); + temp &= 0x0001; + System.out.print(""+temp); + } + System.out.println(); + } + + public static String bitsOfBytes(byte[] bytes) { + String str = ""; + //Expensive, but who cares + for(int i=0; i