g723codec.c

视频会议源码

 ReadFromBitstream(&data,&bit,&dd,24);
 dst_line->lspID=dd; 
 
 //read adaptive codebook lag
 ReadFromBitstream(&data,&bit,&dd,7);
 if(dd<=123) //reject wrong data
  dst_line->olp[0]=(short)dd+pitchmin;
 else {
  dst_line->Crc=1;
  return;
  }
 
 ReadFromBitstream(&data,&bit,&dd,2);
 dst_line->closelag[1]=(short)dd;
  
 ReadFromBitstream(&data,&bit,&dd,7);
 if(dd<=123)
   dst_line->olp[1]=(short)dd+pitchmin;
 else{
   dst_line->Crc=1;
   return;
   }
   
 ReadFromBitstream(&data,&bit,&dd,2);
 dst_line->closelag[3]=(short)dd;
 
 dst_line->closelag[0]=1;
 dst_line->closelag[2]=1;
 
 //read gain
 for(j=0;j<4;j++) {
   ReadFromBitstream(&data,&bit,&dd,12);
   if((*rate==0)&&(dst_line->olp[j>>1]<(sfsize-2))) {
      dst_line->traindrt[j]=(short)(dd>>11);
      dd&=(short)0x7ff;
      bound=85;
      }
   else{
      dst_line->traindrt[j]=0;
      bound=170;
      } 
   dst_line->adptgid[j]=(short)(dd/FixedCodeGainLev);
   if(dst_line->adptgid[j]<bound)
      dst_line->ampindex[j]=(short)(dd%FixedCodeGainLev);
   else{
      dst_line->Crc=1;
      return;
      }
   }
  
  //read pulse grid
  for(j=0;j<4;j++) {
    ReadFromBitstream(&data,&bit,&dd,1);
    dst_line->grid[j]=(short)dd;
    }
    
  //read pulse position and sign index
  if(*rate==0) {//high rate
    ReadFromBitstream(&data,&bit,&dd,1);                               //reject reserved bit
    ReadFromBitstream(&data,&bit,&dd,13);                              //decode high 13 bits
    dst_line->pos[0]=(int)(dd/90)/9;
    dst_line->pos[1]=(int)(dd/90)%9;
    dst_line->pos[2]=(int)(dd%90)/9;
    dst_line->pos[3]=(int)(dd%90)%9;
    
    ReadFromBitstream(&data,&bit,&dd,16);
    dst_line->pos[0]=(int)dd+(dst_line->pos[0]<<16);
    ReadFromBitstream(&data,&bit,&dd,14);
    dst_line->pos[1]=(int)dd+(dst_line->pos[1]<<14);
    ReadFromBitstream(&data,&bit,&dd,16);
    dst_line->pos[2]=(int)dd+(dst_line->pos[2]<<16);
    ReadFromBitstream(&data,&bit,&dd,14);
    dst_line->pos[3]=(int)dd+(dst_line->pos[3]<<14);
    
    ReadFromBitstream(&data,&bit,&dd,6);                           //decode pulse sign index
    dst_line->sign[0]=(short)dd;
    ReadFromBitstream(&data,&bit,&dd,5);
    dst_line->sign[1]=(short)dd;
    ReadFromBitstream(&data,&bit,&dd,6);
    dst_line->sign[2]=(short)dd;
    ReadFromBitstream(&data,&bit,&dd,5);
    dst_line->sign[3]=(short)dd;
    }
  else{
    for(j=0;j<4;j++) {
      ReadFromBitstream(&data,&bit,&dd,12);
      dst_line->pos[j]=(short)dd;
      }
    for(j=0;j<4;j++) {
       ReadFromBitstream(&data,&bit,&dd,4);
       dst_line->sign[j]=(short)dd;
      }
    }
    return;
 }
    
   
 
/******Read bits from bitstream*****/
void ReadFromBitstream(char **bstr,int *bits,int *dst,int len)          //*bits presents the bit to be read
{
 int i,tmp;
// printf("Welcome to ReadFromBitstream\n");
 *dst=0;
 for(i=0;i<len;i++) {
  tmp=1<<(*bits);
  tmp&=**bstr;
  if(tmp>0) 
    (*dst)+=1<<i;
  (*bits)++;
  if(*bits>7) {
    *bits=0;
    (*bstr)++;
    }
  }
  return;
}


short  Band0Tb8[LspCbSize*3] = {
      0,      0,      0,
   -270,  -1372,  -1032,
   -541,  -1650,  -1382,
   -723,  -2011,  -2213,
   -941,  -1122,  -1942,
   -780,  -1145,  -2454,
   -884,  -1309,  -1373,
  -1051,  -1523,  -1766,
  -1083,  -1622,  -2300,
   -777,  -1377,  -2147,
   -935,  -1467,  -2763,
   -802,  -1327,  -3471,
   -935,  -1959,  -3999,
   -240,    -89,    222,
   -661,   -257,   -160,
   -994,   -466,   -419,
   -188,   -164,   -278,
   -342,   -512,   -415,
   -607,   -511,   -797,
     16,     19,   -716,
    374,    425,   -972,
   -346,    245,   -282,
   -265,    506,   -754,
   -620,   -147,   1955,
   -742,   -860,   2597,
   -150,   -352,   2704,
    305,    880,   1954,
    123,    731,   2766,
   -348,    765,   3327,
    618,    221,   3258,
   -178,    -47,   4219,
    393,   1304,   3842,
    698,   1702,   4801,
     63,   -584,   1229,
   -215,   -732,   1704,
    172,   -335,   1909,
     -2,    216,   1797,
    353,    127,   2205,
  -1208,    188,     11,
   -513,    -75,   -683,
   -973,    222,   -646,
   -616,   -843,   -388,
   -950,  -1113,   -359,
  -1431,   -623,   -705,
  -1398,  -1063,   -178,
    -45,   -461,     35,
     -9,   -657,   -216,
    127,  -1078,     95,
   -950,  -1156,    584,
  -1480,  -1494,    449,
   -120,   -705,    516,
   -368,   -961,    727,
   -378,   -526,    973,
   -793,   -614,    676,
   -801,   -755,   1287,
  -1476,   -340,   1636,
   -505,  -1254,   1543,
  -1243,  -1622,   1532,
   -776,  -1477,   -655,
  -1151,  -1296,   -823,
  -1153,  -1672,  -1124,
  -1291,  -2003,  -1702,
   -622,  -1283,     57,
   -471,  -1611,    509,
  -1060,  -1570,   -139,
   -873,  -2156,   -536,
  -1716,  -2021,   -364,
  -2150,  -3218,  -1291,
  -1248,  -1945,  -2904,
  -1215,  -2633,  -2855,
    167,   -244,     84,
    349,   -412,   -217,
    -40,   -352,    632,
    227,   -529,    405,
     68,   -383,   -443,
    167,   -558,   -706,
   -275,   -854,    -14,
   -351,  -1089,   -449,
    341,    -72,   -289,
    603,   -106,   -474,
    322,   -219,   -649,
    179,   -317,   -998,
    450,   -291,   -996,
    555,    195,   -525,
    784,    272,   -831,
   -148,   -384,   -849,
     82,   -536,  -1357,
    238,   -172,  -1354,
    422,   -268,  -1841,
    297,   -737,  -2079,
   -111,   -801,   -598,
      1,   -668,   -984,
   -131,   -818,  -1299,
   -329,   -521,  -1310,
   -151,   -778,  -1834,
    -93,   -352,  -1746,
   -568,   -640,  -1821,
   -509,   -941,  -2183,
    464,   -815,  -1250,
     79,  -1133,  -1597,
   -184,  -1353,  -2123,
   -196,   -410,  -2427,
   -192,   -833,  -2810,
   -259,  -1382,  -3045,
   -217,      4,  -1166,
   -800,   -325,  -1219,
   -363,   -830,   -898,
   -661,  -1134,   -960,
   -386,   -980,  -1501,
   -627,  -1159,  -1722,
   -903,   -829,   -855,
   -685,   -829,  -1313,
  -1065,   -959,  -1405,
    441,     25,   -847,
    655,    -27,  -1181,
   1159,   -110,   -705,
    856,    253,  -1671,
    415,    404,     -1,
    322,    903,   -398,
    670,    499,   -292,
    803,    591,   -610,
   1144,    591,   -814,
    717,    183,    393,
    857,    381,    106,
    609,     62,    -27,
    792,    198,   -325,
    735,    805,     88,
   1142,    812,     78,
   1028,    366,   -292,
   1309,    743,   -237,
   1615,    589,    -79,
   1010,    639,   -243,
    999,    964,   -311,
   1500,   1137,   -615,
    988,    357,    646,
   1227,    667,    683,
   1164,   1565,    894,
   1392,   2015,    477,
   1138,    533,    250,
   1437,    896,    391,
   1765,   1118,     99,
   1112,   1090,    802,
   1596,    846,   1134,
    937,   1161,    279,
   1719,   1254,    683,
   1338,   1086,     35,
   1419,   1324,    428,
   1428,   1524,     40,
   2108,   1594,     89,
   1015,    544,   1222,
   1121,    925,   1263,
   1030,   1318,   1485,
   1295,    789,   1817,
   1323,   1272,   1909,
   1724,   1237,   1803,
   1797,   1689,    858,
   2149,   1367,   1301,
   2302,   1867,    761,
   2863,   2351,   1053,
     52,    163,    -76,
    230,    309,   -492,
    -71,    619,     39,
   -218,    856,    499,
   -654,    736,   -207,
   -535,   1259,    155,
   -480,   1476,    643,
    262,   1081,    102,
    309,   1592,   -182,
    627,   1629,    534,
    337,    643,    456,
    758,    670,    713,
    202,   1126,    658,
    612,   1131,    666,
    686,   1223,   1136,
   -131,    377,    525,
     42,    708,    907,
     87,   1488,   1035,
    432,   2117,    904,
    137,    981,   1332,
   -447,   1014,   1136,
   -839,   1793,   1246,
   -559,    297,    198,
   -850,    685,    446,
  -1273,    632,    826,
   -401,   -544,    173,
   -753,   -793,    144,
   -436,     -9,    772,
   -115,   -243,   1310,
   -670,   -269,    374,
  -1027,    -13,    639,
   -887,    -81,   1137,
  -1277,   -455,    158,
  -1411,   -720,    736,
    172,     88,    403,
    386,    255,    756,
   -500,    522,    910,
   -958,    659,   1388,
   -395,    301,   1344,
   -356,    768,   1813,
   -613,    841,   2419,
    445,   -122,    252,
    629,    -87,    723,
    283,   -253,    870,
    456,   -116,   1381,
    757,    180,   1059,
    532,    408,   1509,
    947,    288,   1806,
   1325,    994,   2524,
    892,   1219,   3023,
   1397,   1596,   3406,
   1143,   1552,   2546,
   1850,   1433,   2710,
    -10,    134,   1002,
    154,    499,   1323,
    508,    792,   1117,
    509,   1340,   1616,
    762,    862,   1608,
    787,    740,   2320,
    794,   1727,   1283,
    465,   2108,   1660,
   -120,   1451,   1613,
   -386,   2016,   2169,
    891,   1225,   2050,
    456,   1480,   2185,
   1493,   1283,   1209,
   1397,   1636,   1518,
   1776,   1738,   1552,
   1572,   1698,   2141,
   1389,   2126,   1271,
   1959,   2413,   1119,
   1365,   2892,   1505,
   2206,   1971,   1623,
   2076,   1950,   2280,
   1717,   2291,   1867,
   2366,   2515,   1953,
   2865,   2838,   2522,
   2535,   3465,   2011,
   3381,   4127,   2638,
    836,   2667,   2289,
   1761,   2773,   2337,
   1415,   3325,   2911,
   2354,   3138,   3126,
   2659,   4192,   4010,
   1048,   1786,   1818,
   1242,   2111,   2240,
   1512,   2079,   2780,
   1573,   2491,   3138,
   2230,   2377,   2782,
    416,   1773,   2704,
    725,   2336,   3297,
   1252,   2373,   3978,
   2094,   2268,   3568,
   2011,   2712,   4528,
   1341,   3507,   3876,
   1216,   3919,   4922,
   1693,   4793,   6012,
   } ;



/*
**  Band1Tb8:
**
**  Purpose:
**      Vector Quantize the second 3-vector of the 10 LSP parameters.
**
**  Table Structure:
**      8 bit, 256 entry table.
*/

short  Band1Tb8[LspCbSize*3] = {
      0,      0,      0,
  -2114,  -1302,     76,
  -2652,  -1278,  -1368,
  -2847,   -828,   -349,
  -3812,  -2190,   -349,
  -3946,   -364,   -449,
  -2725,  -4492,  -3607,
  -3495,  -4764,  -1744,
    -51,   -756,     84,
   -153,  -1191,    504,
    108,  -1418,   1167,
   -835,   -896,    390,
   -569,  -1702,     87,
  -1151,  -1818,    933,
  -1826,  -2547,    411,
  -1842,  -1818,   1451,
  -2438,  -1611,    781,
  -2747,  -2477,   1311,
   -940,   1252,    477,
  -1629,   1688,    602,
  -1202,    617,    280,
  -1737,    393,    580,
  -1528,   1077,   1199,
  -2165,   -161,   1408,
  -2504,  -1087,   2371,
  -3458,   -175,   1395,
  -1397,    -98,   -843,
  -2252,   -177,  -1149,
  -1489,   -726,  -1283,
  -1558,   -265,  -1744,
  -1867,   -821,  -1897,
  -2062,  -1516,  -2340,
  -2595,  -1142,  -2861,
    170,     46,   -819,
   -193,   -204,  -1151,
    326,   -196,  -1532,
    780,    329,   -816,
    201,    369,  -1243,
    650,   -209,  -1060,
   1144,    -15,  -1216,
   1203,   -259,  -1867,
   -890,   -564,  -1430,
   -638,   -852,  -1921,
    177,   -739,  -1358,
   -261,   -526,  -1666,
    206,   -407,  -2255,
    338,   -526,   -822,
    421,  -1095,  -1009,
    765,   -607,  -1408,
    825,  -1295,  -2004,
    357,   -905,  -1815,
    -58,  -1248,  -1588,
   -596,  -1436,  -2046,
    -73,  -1159,  -2116,
   -115,  -1382,  -2581,
   -160,  -1723,  -1952,
     -6,  -2196,  -2954,
   -649,  -1705,  -2603,
   -617,  -1453,  -3282,
   -949,  -2019,  -3102,
   -812,   1544,   1937,
  -1854,    574,   2000,
  -1463,   1140,   2649,
  -2683,   1748,   1452,
  -2486,   2241,   2523,
    783,   1910,   1435,
    581,   2682,   1376,
    236,   2197,   1885,
   -453,   2943,   2057,
   -682,   2178,   2565,
  -1342,   3201,   3328,
   -288,   -184,    262,
    121,   -149,   -183,
    758,   -412,    206,
   1038,   -204,    853,
   1577,   -457,    700,
    937,   -640,   -567,
   1508,   -528,  -1024,
   -225,   -527,   -427,
   -564,  -1095,   -332,
   -742,   -353,   -186,