1 /* 2 * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 /****************************************************************** 12 13 iLBC Speech Coder ANSI-C Source Code 14 15 WebRtcIlbcfix_UnpackBits.c 16 17 ******************************************************************/ 18 19 #include "defines.h" 20 21 /*----------------------------------------------------------------* 22 * unpacking of bits from bitstream, i.e., vector of bytes 23 *---------------------------------------------------------------*/ 24 25 int16_t WebRtcIlbcfix_UnpackBits( /* (o) "Empty" frame indicator */ 26 const uint16_t *bitstream, /* (i) The packatized bitstream */ 27 iLBC_bits *enc_bits, /* (o) Paramerers from bitstream */ 28 int16_t mode /* (i) Codec mode (20 or 30) */ 29 ) { 30 const uint16_t *bitstreamPtr; 31 int i, k; 32 int16_t *tmpPtr; 33 34 bitstreamPtr=bitstream; 35 36 /* First int16_t */ 37 enc_bits->lsf[0] = (*bitstreamPtr)>>10; /* Bit 0..5 */ 38 enc_bits->lsf[1] = ((*bitstreamPtr)>>3)&0x7F; /* Bit 6..12 */ 39 enc_bits->lsf[2] = ((*bitstreamPtr)&0x7)<<4; /* Bit 13..15 */ 40 bitstreamPtr++; 41 /* Second int16_t */ 42 enc_bits->lsf[2] |= ((*bitstreamPtr)>>12)&0xF; /* Bit 0..3 */ 43 44 if (mode==20) { 45 enc_bits->startIdx = ((*bitstreamPtr)>>10)&0x3; /* Bit 4..5 */ 46 enc_bits->state_first = ((*bitstreamPtr)>>9)&0x1; /* Bit 6 */ 47 enc_bits->idxForMax = ((*bitstreamPtr)>>3)&0x3F; /* Bit 7..12 */ 48 enc_bits->cb_index[0] = ((*bitstreamPtr)&0x7)<<4; /* Bit 13..15 */ 49 bitstreamPtr++; 50 /* Third int16_t */ 51 enc_bits->cb_index[0] |= ((*bitstreamPtr)>>12)&0xE; /* Bit 0..2 */ 52 enc_bits->gain_index[0] = ((*bitstreamPtr)>>8)&0x18; /* Bit 3..4 */ 53 enc_bits->gain_index[1] = ((*bitstreamPtr)>>7)&0x8; /* Bit 5 */ 54 enc_bits->cb_index[3] = ((*bitstreamPtr)>>2)&0xFE; /* Bit 6..12 */ 55 enc_bits->gain_index[3] = ((*bitstreamPtr)<<2)&0x10; /* Bit 13 */ 56 enc_bits->gain_index[4] = ((*bitstreamPtr)<<2)&0x8; /* Bit 14 */ 57 enc_bits->gain_index[6] = ((*bitstreamPtr)<<4)&0x10; /* Bit 15 */ 58 } else { /* mode==30 */ 59 enc_bits->lsf[3] = ((*bitstreamPtr)>>6)&0x3F; /* Bit 4..9 */ 60 enc_bits->lsf[4] = ((*bitstreamPtr)<<1)&0x7E; /* Bit 10..15 */ 61 bitstreamPtr++; 62 /* Third int16_t */ 63 enc_bits->lsf[4] |= ((*bitstreamPtr)>>15)&0x1; /* Bit 0 */ 64 enc_bits->lsf[5] = ((*bitstreamPtr)>>8)&0x7F; /* Bit 1..7 */ 65 enc_bits->startIdx = ((*bitstreamPtr)>>5)&0x7; /* Bit 8..10 */ 66 enc_bits->state_first = ((*bitstreamPtr)>>4)&0x1; /* Bit 11 */ 67 enc_bits->idxForMax = ((*bitstreamPtr)<<2)&0x3C; /* Bit 12..15 */ 68 bitstreamPtr++; 69 /* 4:th int16_t */ 70 enc_bits->idxForMax |= ((*bitstreamPtr)>>14)&0x3; /* Bit 0..1 */ 71 enc_bits->cb_index[0] = ((*bitstreamPtr)>>7)&0x78; /* Bit 2..5 */ 72 enc_bits->gain_index[0] = ((*bitstreamPtr)>>5)&0x10; /* Bit 6 */ 73 enc_bits->gain_index[1] = ((*bitstreamPtr)>>5)&0x8; /* Bit 7 */ 74 enc_bits->cb_index[3] = ((*bitstreamPtr))&0xFC; /* Bit 8..13 */ 75 enc_bits->gain_index[3] = ((*bitstreamPtr)<<3)&0x10; /* Bit 14 */ 76 enc_bits->gain_index[4] = ((*bitstreamPtr)<<3)&0x8; /* Bit 15 */ 77 } 78 /* Class 2 bits of ULP */ 79 /* 4:th to 6:th int16_t for 20 ms case 80 5:th to 7:th int16_t for 30 ms case */ 81 bitstreamPtr++; 82 tmpPtr=enc_bits->idxVec; 83 for (k=0; k<3; k++) { 84 for (i=15; i>=0; i--) { 85 (*tmpPtr) = (((*bitstreamPtr)>>i)<<2)&0x4; 86 /* Bit 15-i */ 87 tmpPtr++; 88 } 89 bitstreamPtr++; 90 } 91 92 if (mode==20) { 93 /* 7:th int16_t */ 94 for (i=15; i>6; i--) { 95 (*tmpPtr) = (((*bitstreamPtr)>>i)<<2)&0x4; 96 /* Bit 15-i */ 97 tmpPtr++; 98 } 99 enc_bits->gain_index[1] |= ((*bitstreamPtr)>>4)&0x4; /* Bit 9 */ 100 enc_bits->gain_index[3] |= ((*bitstreamPtr)>>2)&0xC; /* Bit 10..11 */ 101 enc_bits->gain_index[4] |= ((*bitstreamPtr)>>1)&0x4; /* Bit 12 */ 102 enc_bits->gain_index[6] |= ((*bitstreamPtr)<<1)&0x8; /* Bit 13 */ 103 enc_bits->gain_index[7] = ((*bitstreamPtr)<<2)&0xC; /* Bit 14..15 */ 104 105 } else { /* mode==30 */ 106 /* 8:th int16_t */ 107 for (i=15; i>5; i--) { 108 (*tmpPtr) = (((*bitstreamPtr)>>i)<<2)&0x4; 109 /* Bit 15-i */ 110 tmpPtr++; 111 } 112 enc_bits->cb_index[0] |= ((*bitstreamPtr)>>3)&0x6; /* Bit 10..11 */ 113 enc_bits->gain_index[0] |= ((*bitstreamPtr))&0x8; /* Bit 12 */ 114 enc_bits->gain_index[1] |= ((*bitstreamPtr))&0x4; /* Bit 13 */ 115 enc_bits->cb_index[3] |= ((*bitstreamPtr))&0x2; /* Bit 14 */ 116 enc_bits->cb_index[6] = ((*bitstreamPtr)<<7)&0x80; /* Bit 15 */ 117 bitstreamPtr++; 118 /* 9:th int16_t */ 119 enc_bits->cb_index[6] |= ((*bitstreamPtr)>>9)&0x7E; /* Bit 0..5 */ 120 enc_bits->cb_index[9] = ((*bitstreamPtr)>>2)&0xFE; /* Bit 6..12 */ 121 enc_bits->cb_index[12] = ((*bitstreamPtr)<<5)&0xE0; /* Bit 13..15 */ 122 bitstreamPtr++; 123 /* 10:th int16_t */ 124 enc_bits->cb_index[12] |= ((*bitstreamPtr)>>11)&0x1E;/* Bit 0..3 */ 125 enc_bits->gain_index[3] |= ((*bitstreamPtr)>>8)&0xC; /* Bit 4..5 */ 126 enc_bits->gain_index[4] |= ((*bitstreamPtr)>>7)&0x6; /* Bit 6..7 */ 127 enc_bits->gain_index[6] = ((*bitstreamPtr)>>3)&0x18; /* Bit 8..9 */ 128 enc_bits->gain_index[7] = ((*bitstreamPtr)>>2)&0xC; /* Bit 10..11 */ 129 enc_bits->gain_index[9] = ((*bitstreamPtr)<<1)&0x10; /* Bit 12 */ 130 enc_bits->gain_index[10] = ((*bitstreamPtr)<<1)&0x8; /* Bit 13 */ 131 enc_bits->gain_index[12] = ((*bitstreamPtr)<<3)&0x10; /* Bit 14 */ 132 enc_bits->gain_index[13] = ((*bitstreamPtr)<<3)&0x8; /* Bit 15 */ 133 } 134 bitstreamPtr++; 135 /* Class 3 bits of ULP */ 136 /* 8:th to 14:th int16_t for 20 ms case 137 11:th to 17:th int16_t for 30 ms case */ 138 tmpPtr=enc_bits->idxVec; 139 for (k=0; k<7; k++) { 140 for (i=14; i>=0; i-=2) { 141 (*tmpPtr) |= ((*bitstreamPtr)>>i)&0x3; /* Bit 15-i..14-i*/ 142 tmpPtr++; 143 } 144 bitstreamPtr++; 145 } 146 147 if (mode==20) { 148 /* 15:th int16_t */ 149 enc_bits->idxVec[56] |= ((*bitstreamPtr)>>14)&0x3; /* Bit 0..1 */ 150 enc_bits->cb_index[0] |= ((*bitstreamPtr)>>13)&0x1; /* Bit 2 */ 151 enc_bits->cb_index[1] = ((*bitstreamPtr)>>6)&0x7F; /* Bit 3..9 */ 152 enc_bits->cb_index[2] = ((*bitstreamPtr)<<1)&0x7E; /* Bit 10..15 */ 153 bitstreamPtr++; 154 /* 16:th int16_t */ 155 enc_bits->cb_index[2] |= ((*bitstreamPtr)>>15)&0x1; /* Bit 0 */ 156 enc_bits->gain_index[0] |= ((*bitstreamPtr)>>12)&0x7; /* Bit 1..3 */ 157 enc_bits->gain_index[1] |= ((*bitstreamPtr)>>10)&0x3; /* Bit 4..5 */ 158 enc_bits->gain_index[2] = ((*bitstreamPtr)>>7)&0x7; /* Bit 6..8 */ 159 enc_bits->cb_index[3] |= ((*bitstreamPtr)>>6)&0x1; /* Bit 9 */ 160 enc_bits->cb_index[4] = ((*bitstreamPtr)<<1)&0x7E; /* Bit 10..15 */ 161 bitstreamPtr++; 162 /* 17:th int16_t */ 163 enc_bits->cb_index[4] |= ((*bitstreamPtr)>>15)&0x1; /* Bit 0 */ 164 enc_bits->cb_index[5] = ((*bitstreamPtr)>>8)&0x7F; /* Bit 1..7 */ 165 enc_bits->cb_index[6] = ((*bitstreamPtr))&0xFF; /* Bit 8..15 */ 166 bitstreamPtr++; 167 /* 18:th int16_t */ 168 enc_bits->cb_index[7] = (*bitstreamPtr)>>8; /* Bit 0..7 */ 169 enc_bits->cb_index[8] = (*bitstreamPtr)&0xFF; /* Bit 8..15 */ 170 bitstreamPtr++; 171 /* 19:th int16_t */ 172 enc_bits->gain_index[3] |= ((*bitstreamPtr)>>14)&0x3; /* Bit 0..1 */ 173 enc_bits->gain_index[4] |= ((*bitstreamPtr)>>12)&0x3; /* Bit 2..3 */ 174 enc_bits->gain_index[5] = ((*bitstreamPtr)>>9)&0x7; /* Bit 4..6 */ 175 enc_bits->gain_index[6] |= ((*bitstreamPtr)>>6)&0x7; /* Bit 7..9 */ 176 enc_bits->gain_index[7] |= ((*bitstreamPtr)>>4)&0x3; /* Bit 10..11 */ 177 enc_bits->gain_index[8] = ((*bitstreamPtr)>>1)&0x7; /* Bit 12..14 */ 178 } else { /* mode==30 */ 179 /* 18:th int16_t */ 180 enc_bits->idxVec[56] |= ((*bitstreamPtr)>>14)&0x3; /* Bit 0..1 */ 181 enc_bits->idxVec[57] |= ((*bitstreamPtr)>>12)&0x3; /* Bit 2..3 */ 182 enc_bits->cb_index[0] |= ((*bitstreamPtr)>>11)&1; /* Bit 4 */ 183 enc_bits->cb_index[1] = ((*bitstreamPtr)>>4)&0x7F; /* Bit 5..11 */ 184 enc_bits->cb_index[2] = ((*bitstreamPtr)<<3)&0x78; /* Bit 12..15 */ 185 bitstreamPtr++; 186 /* 19:th int16_t */ 187 enc_bits->cb_index[2] |= ((*bitstreamPtr)>>13)&0x7; /* Bit 0..2 */ 188 enc_bits->gain_index[0] |= ((*bitstreamPtr)>>10)&0x7; /* Bit 3..5 */ 189 enc_bits->gain_index[1] |= ((*bitstreamPtr)>>8)&0x3; /* Bit 6..7 */ 190 enc_bits->gain_index[2] = ((*bitstreamPtr)>>5)&0x7; /* Bit 8..10 */ 191 enc_bits->cb_index[3] |= ((*bitstreamPtr)>>4)&0x1; /* Bit 11 */ 192 enc_bits->cb_index[4] = ((*bitstreamPtr)<<3)&0x78; /* Bit 12..15 */ 193 bitstreamPtr++; 194 /* 20:th int16_t */ 195 enc_bits->cb_index[4] |= ((*bitstreamPtr)>>13)&0x7; /* Bit 0..2 */ 196 enc_bits->cb_index[5] = ((*bitstreamPtr)>>6)&0x7F; /* Bit 3..9 */ 197 enc_bits->cb_index[6] |= ((*bitstreamPtr)>>5)&0x1; /* Bit 10 */ 198 enc_bits->cb_index[7] = ((*bitstreamPtr)<<3)&0xF8; /* Bit 11..15 */ 199 bitstreamPtr++; 200 /* 21:st int16_t */ 201 enc_bits->cb_index[7] |= ((*bitstreamPtr)>>13)&0x7; /* Bit 0..2 */ 202 enc_bits->cb_index[8] = ((*bitstreamPtr)>>5)&0xFF; /* Bit 3..10 */ 203 enc_bits->cb_index[9] |= ((*bitstreamPtr)>>4)&0x1; /* Bit 11 */ 204 enc_bits->cb_index[10] = ((*bitstreamPtr)<<4)&0xF0; /* Bit 12..15 */ 205 bitstreamPtr++; 206 /* 22:nd int16_t */ 207 enc_bits->cb_index[10] |= ((*bitstreamPtr)>>12)&0xF; /* Bit 0..3 */ 208 enc_bits->cb_index[11] = ((*bitstreamPtr)>>4)&0xFF; /* Bit 4..11 */ 209 enc_bits->cb_index[12] |= ((*bitstreamPtr)>>3)&0x1; /* Bit 12 */ 210 enc_bits->cb_index[13] = ((*bitstreamPtr)<<5)&0xE0; /* Bit 13..15 */ 211 bitstreamPtr++; 212 /* 23:rd int16_t */ 213 enc_bits->cb_index[13] |= ((*bitstreamPtr)>>11)&0x1F;/* Bit 0..4 */ 214 enc_bits->cb_index[14] = ((*bitstreamPtr)>>3)&0xFF; /* Bit 5..12 */ 215 enc_bits->gain_index[3] |= ((*bitstreamPtr)>>1)&0x3; /* Bit 13..14 */ 216 enc_bits->gain_index[4] |= ((*bitstreamPtr)&0x1); /* Bit 15 */ 217 bitstreamPtr++; 218 /* 24:rd int16_t */ 219 enc_bits->gain_index[5] = ((*bitstreamPtr)>>13)&0x7; /* Bit 0..2 */ 220 enc_bits->gain_index[6] |= ((*bitstreamPtr)>>10)&0x7; /* Bit 3..5 */ 221 enc_bits->gain_index[7] |= ((*bitstreamPtr)>>8)&0x3; /* Bit 6..7 */ 222 enc_bits->gain_index[8] = ((*bitstreamPtr)>>5)&0x7; /* Bit 8..10 */ 223 enc_bits->gain_index[9] |= ((*bitstreamPtr)>>1)&0xF; /* Bit 11..14 */ 224 enc_bits->gain_index[10] |= ((*bitstreamPtr)<<2)&0x4; /* Bit 15 */ 225 bitstreamPtr++; 226 /* 25:rd int16_t */ 227 enc_bits->gain_index[10] |= ((*bitstreamPtr)>>14)&0x3; /* Bit 0..1 */ 228 enc_bits->gain_index[11] = ((*bitstreamPtr)>>11)&0x7; /* Bit 2..4 */ 229 enc_bits->gain_index[12] |= ((*bitstreamPtr)>>7)&0xF; /* Bit 5..8 */ 230 enc_bits->gain_index[13] |= ((*bitstreamPtr)>>4)&0x7; /* Bit 9..11 */ 231 enc_bits->gain_index[14] = ((*bitstreamPtr)>>1)&0x7; /* Bit 12..14 */ 232 } 233 /* Last bit should be zero, otherwise it's an "empty" frame */ 234 if (((*bitstreamPtr)&0x1) == 1) { 235 return(1); 236 } else { 237 return(0); 238 } 239 } 240
