www.gusucode.com > 一个可以在局域网进行视频聊天的源代码 > 一个可以在局域网进行视频聊天的源代码/VoIP/decoder/GetVlc.cpp
////////////////////////////////////////////////////////////////////////////
//
//
// Project : VideoNet version 1.1.
// Description : Peer to Peer Video Conferencing over the LAN.
// Author : Nagareshwar Y Talekar ( nsry2002@yahoo.co.in)
// Date : 15-6-2004.
//
// This is the modified version of tmndecode (H.263 decoder)
// written by Karl & Robert.It was in ANSI C. I have converted into C++
// so that it can be integrated into any windows application. I have
// removed some of the files which had display and file storing
// functions.I have removed the unnecessary code and also added some
// new files..
// Original library dealt with files. Input & Output , both were files.
// I have done some major changes so that it can be used for real time
// decoding process. Now one can use this library for decoding H263 frames.
//
//
// File description :
// Name : GetVlc.cpp
//
/////////////////////////////////////////////////////////////////////////////
/************************************************************************
*
* getvlc.c, variable length decoding for tmndecode (H.263 decoder)
* Copyright (C) 1996 Telenor R&D, Norway
* Karl Olav Lillevold <Karl.Lillevold@nta.no>
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Karl Olav Lillevold <Karl.Lillevold@nta.no>
* Telenor Research and Development
* P.O.Box 83 tel.: +47 63 84 84 00
* N-2007 Kjeller, Norway fax.: +47 63 81 00 76
*
* Robert Danielsen e-mail: Robert.Danielsen@nta.no
* Telenor Research and Development www: http://www.nta.no/brukere/DVC/
* P.O.Box 83 tel.: +47 63 84 84 00
* N-2007 Kjeller, Norway fax.: +47 63 81 00 76
*
************************************************************************/
/*
* based on mpeg2decode, (C) 1994, MPEG Software Simulation Group
* and mpeg2play, (C) 1994 Stefan Eckart
* <stefan@lis.e-technik.tu-muenchen.de>
*
*/
#include "GetVlc.h"
// Definitions of variables......
VLCtab TMNMVtab0[] = {
{3,4}, {61,4}, {2,3}, {2,3}, {62,3}, {62,3},
{1,2}, {1,2}, {1,2}, {1,2}, {63,2}, {63,2}, {63,2}, {63,2}
};
VLCtab TMNMVtab1[] = {
{12,10}, {52,10}, {11,10}, {53,10}, {10,9}, {10,9},
{54,9}, {54,9}, {9,9}, {9,9}, {55,9}, {55,9},
{8,9}, {8,9}, {56,9}, {56,9}, {7,7}, {7,7},
{7,7}, {7,7}, {7,7}, {7,7}, {7,7}, {7,7},
{57,7}, {57,7}, {57,7}, {57,7}, {57,7}, {57,7},
{57,7}, {57,7}, {6,7}, {6,7}, {6,7}, {6,7},
{6,7}, {6,7}, {6,7}, {6,7}, {58,7}, {58,7},
{58,7}, {58,7}, {58,7}, {58,7}, {58,7}, {58,7},
{5,7}, {5,7}, {5,7}, {5,7}, {5,7}, {5,7},
{5,7}, {5,7}, {59,7}, {59,7}, {59,7}, {59,7},
{59,7}, {59,7}, {59,7}, {59,7}, {4,6}, {4,6},
{4,6}, {4,6}, {4,6}, {4,6}, {4,6}, {4,6},
{4,6}, {4,6}, {4,6}, {4,6}, {4,6}, {4,6},
{4,6}, {4,6}, {60,6}, {60,6},{60,6},{60,6},
{60,6},{60,6},{60,6},{60,6},{60,6},{60,6},
{60,6},{60,6},{60,6},{60,6},{60,6},{60,6}
};
VLCtab TMNMVtab2[] = {
{32,12}, {31,12}, {33,12}, {30,11}, {30,11}, {34,11},
{34,11}, {29,11}, {29,11}, {35,11}, {35,11}, {28,11},
{28,11}, {36,11}, {36,11}, {27,11}, {27,11}, {37,11},
{37,11}, {26,11}, {26,11}, {38,11}, {38,11}, {25,11},
{25,11}, {39,11}, {39,11}, {24,10}, {24,10}, {24,10},
{24,10}, {40,10}, {40,10}, {40,10}, {40,10}, {23,10},
{23,10}, {23,10}, {23,10}, {41,10}, {41,10}, {41,10},
{41,10}, {22,10}, {22,10}, {22,10}, {22,10}, {42,10},
{42,10}, {42,10}, {42,10}, {21,10}, {21,10}, {21,10},
{21,10}, {43,10}, {43,10}, {43,10}, {43,10}, {20,10},
{20,10}, {20,10}, {20,10}, {44,10}, {44,10}, {44,10},
{44,10}, {19,10}, {19,10}, {19,10}, {19,10}, {45,10},
{45,10}, {45,10}, {45,10}, {18,10}, {18,10}, {18,10},
{18,10}, {46,10}, {46,10}, {46,10}, {46,10}, {17,10},
{17,10}, {17,10}, {17,10}, {47,10}, {47,10}, {47,10},
{47,10}, {16,10}, {16,10}, {16,10}, {16,10}, {48,10},
{48,10}, {48,10}, {48,10}, {15,10}, {15,10}, {15,10},
{15,10}, {49,10}, {49,10}, {49,10}, {49,10}, {14,10},
{14,10}, {14,10}, {14,10}, {50,10}, {50,10}, {50,10},
{50,10}, {13,10}, {13,10}, {13,10}, {13,10}, {51,10},
{51,10}, {51,10}, {51,10}
};
VLCtab MCBPCtab[] = {
{-1,0},
{255,9}, {52,9}, {36,9}, {20,9}, {49,9}, {35,8}, {35,8}, {19,8}, {19,8},
{50,8}, {50,8}, {51,7}, {51,7}, {51,7}, {51,7}, {34,7}, {34,7}, {34,7},
{34,7}, {18,7}, {18,7}, {18,7}, {18,7}, {33,7}, {33,7}, {33,7}, {33,7},
{17,7}, {17,7}, {17,7}, {17,7}, {4,6}, {4,6}, {4,6}, {4,6}, {4,6},
{4,6}, {4,6}, {4,6}, {48,6}, {48,6}, {48,6}, {48,6}, {48,6}, {48,6},
{48,6}, {48,6}, {3,5}, {3,5}, {3,5}, {3,5}, {3,5}, {3,5}, {3,5},
{3,5}, {3,5}, {3,5}, {3,5}, {3,5}, {3,5}, {3,5}, {3,5}, {3,5},
{32,4}, {32,4}, {32,4}, {32,4}, {32,4}, {32,4}, {32,4}, {32,4}, {32,4},
{32,4}, {32,4}, {32,4}, {32,4}, {32,4}, {32,4}, {32,4}, {32,4}, {32,4},
{32,4}, {32,4}, {32,4}, {32,4}, {32,4}, {32,4}, {32,4}, {32,4}, {32,4},
{32,4}, {32,4}, {32,4}, {32,4}, {32,4}, {16,4}, {16,4}, {16,4}, {16,4},
{16,4}, {16,4}, {16,4}, {16,4}, {16,4}, {16,4}, {16,4}, {16,4}, {16,4},
{16,4}, {16,4}, {16,4}, {16,4}, {16,4}, {16,4}, {16,4}, {16,4}, {16,4},
{16,4}, {16,4}, {16,4}, {16,4}, {16,4}, {16,4}, {16,4}, {16,4}, {16,4},
{16,4}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3},
{2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3},
{2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3},
{2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3},
{2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3},
{2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3},
{2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3},
{2,3}, {2,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3},
{1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3},
{1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3},
{1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3},
{1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3},
{1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3},
{1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3},
{1,3}, {1,3}, {1,3},
};
VLCtab MCBPCtabintra[] = {
{-1,0},
{20,6}, {36,6}, {52,6}, {4,4}, {4,4}, {4,4},
{4,4}, {19,3}, {19,3}, {19,3}, {19,3}, {19,3},
{19,3}, {19,3}, {19,3}, {35,3}, {35,3}, {35,3},
{35,3}, {35,3}, {35,3}, {35,3}, {35,3}, {51,3},
{51,3}, {51,3}, {51,3}, {51,3}, {51,3}, {51,3},
{51,3},
};
VLCtab CBPYtab[48] =
{ {-1,0}, {-1,0}, {9,6}, {6,6}, {7,5}, {7,5}, {11,5}, {11,5},
{13,5}, {13,5}, {14,5}, {14,5}, {15,4}, {15,4}, {15,4}, {15,4},
{3,4}, {3,4}, {3,4}, {3,4}, {5,4},{5,4},{5,4},{5,4},
{1,4}, {1,4}, {1,4}, {1,4}, {10,4}, {10,4}, {10,4}, {10,4},
{2,4}, {2,4}, {2,4}, {2,4}, {12,4}, {12,4}, {12,4}, {12,4},
{4,4}, {4,4}, {4,4}, {4,4}, {8,4}, {8,4}, {8,4}, {8,4},
};
int getTMNMV()
{
int code;
if (trace)
fputs("motion_code (",dlog);
if (getbits1())
{
if (trace)
fputs("1): 0\n",dlog);
return 0;
}
if ((code = showbits(12))>=512)
{
code = (code>>8) - 2;
flushbits(TMNMVtab0[code].len);
if (trace)
{
fputs("0",dlog);
printbits(code+2,4,TMNMVtab0[code].len);
//fputs("): %d\n", TMNMVtab0[code].val);
}
return TMNMVtab0[code].val;
}
if (code>=128)
{
code = (code>>2) -32;
flushbits(TMNMVtab1[code].len);
if (trace)
{
fputs("0",dlog);
printbits(code+32,10,TMNMVtab1[code].len);
// printf("): %d\n",TMNMVtab1[code].val);
}
return TMNMVtab1[code].val;
}
if ((code-=5)<0)
{
if (!quiet)
fputs("Invalid motion_vector code\n",dlog);
fault=1;
return 0;
}
flushbits(TMNMVtab2[code].len);
if (trace)
{
fputs("0",dlog);
printbits(code+5,12,TMNMVtab2[code].len);
// printf("): %d\n",TMNMVtab2[code].val);
}
return TMNMVtab2[code].val;
}
int getMCBPC()
{
int code;
if (trace)
fputs("MCBPC (",dlog);
code = showbits(9);
if (code == 1) {
/* macroblock stuffing */
if (trace)
fputs("000000001): stuffing\n",dlog);
flushbits(9);
return 255;
}
if (code == 0) {
if (!quiet)
fputs("Invalid MCBPC code\n",dlog);
fault = 1;
return 0;
}
if (code>=256)
{
flushbits(1);
// if (trace)
// fputs(1): %d\n",0);
return 0;
}
flushbits(MCBPCtab[code].len);
if (trace)
{
printbits(code,9,MCBPCtab[code].len);
//printf("): %d\n",MCBPCtab[code].val);
}
return MCBPCtab[code].val;
}
int getMODB()
{
int code;
int MODB;
if (trace)
fputs("MODB (",dlog);
code = showbits(2);
if (code < 2) {
if (trace)
fputs("0): MODB = 0\n",dlog);
MODB = 0;
flushbits(1);
}
else if (code == 2) {
if (trace)
fputs("10): MODB = 1\n",dlog);
MODB = 1;
flushbits(2);
}
else { /* code == 3 */
if (trace)
fputs("11): MODB = 2\n",dlog);
MODB = 2;
flushbits(2);
}
return MODB;
}
int getMCBPCintra()
{
int code;
if (trace)
fputs("MCBPCintra (",dlog);
code = showbits(9);
if (code == 1) {
/* macroblock stuffing */
if (trace)
fputs("000000001): stuffing\n",dlog);
flushbits(9);
return 255;
}
if (code < 8) {
if (!quiet)
fputs("Invalid MCBPCintra code\n",dlog);
fault = 1;
return 0;
}
code >>= 3;
if (code>=32)
{
flushbits(1);
//if (trace)
// printf("1): %d\n",3);
return 3;
}
flushbits(MCBPCtabintra[code].len);
if (trace)
{
printbits(code,6,MCBPCtabintra[code].len);
//printf("): %d\n",MCBPCtabintra[code].val);
}
return MCBPCtabintra[code].val;
}
int getCBPY()
{
int code;
if (trace)
fputs("CBPY (",dlog);
code = showbits(6);
if (code < 2) {
if (!quiet)
fputs("Invalid CBPY code\n",dlog);
fault = 1;
return -1;
}
if (code>=48)
{
flushbits(2);
//if (trace)
// printf("11): %d\n",0);
return 0;
}
flushbits(CBPYtab[code].len);
if (trace)
{
printbits(code,6,CBPYtab[code].len);
//printf("): %d\n",CBPYtab[code].val);
}
return CBPYtab[code].val;
}