1 /* 2 * Copyright (c) 2011 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 define.h 16 17 ******************************************************************/ 18 #ifndef MODULES_AUDIO_CODING_CODECS_ILBC_MAIN_SOURCE_DEFINES_H_ 19 #define MODULES_AUDIO_CODING_CODECS_ILBC_MAIN_SOURCE_DEFINES_H_ 20 21 #include <stdint.h> 22 #include <string.h> 23 24 #include "common_audio/signal_processing/include/signal_processing_library.h" 25 26 /* general codec settings */ 27 28 #define FS 8000 29 #define BLOCKL_20MS 160 30 #define BLOCKL_30MS 240 31 #define BLOCKL_MAX 240 32 #define NSUB_20MS 4 33 #define NSUB_30MS 6 34 #define NSUB_MAX 6 35 #define NASUB_20MS 2 36 #define NASUB_30MS 4 37 #define NASUB_MAX 4 38 #define SUBL 40 39 #define STATE_LEN 80 40 #define STATE_SHORT_LEN_30MS 58 41 #define STATE_SHORT_LEN_20MS 57 42 43 /* LPC settings */ 44 45 #define LPC_FILTERORDER 10 46 #define LPC_LOOKBACK 60 47 #define LPC_N_20MS 1 48 #define LPC_N_30MS 2 49 #define LPC_N_MAX 2 50 #define LPC_ASYMDIFF 20 51 #define LSF_NSPLIT 3 52 #define LSF_NUMBER_OF_STEPS 4 53 #define LPC_HALFORDER 5 54 #define COS_GRID_POINTS 60 55 56 /* cb settings */ 57 58 #define CB_NSTAGES 3 59 #define CB_EXPAND 2 60 #define CB_MEML 147 61 #define CB_FILTERLEN (2 * 4) 62 #define CB_HALFFILTERLEN 4 63 #define CB_RESRANGE 34 64 #define CB_MAXGAIN_FIXQ6 83 /* error = -0.24% */ 65 #define CB_MAXGAIN_FIXQ14 21299 66 67 /* enhancer */ 68 69 #define ENH_BLOCKL 80 /* block length */ 70 #define ENH_BLOCKL_HALF (ENH_BLOCKL / 2) 71 #define ENH_HL \ 72 3 /* 2*ENH_HL+1 is number blocks \ 73 in said second \ 74 sequence */ 75 #define ENH_SLOP \ 76 2 /* max difference estimated and \ 77 correct pitch period */ 78 #define ENH_PLOCSL \ 79 8 /* pitch-estimates and \ 80 pitch-locations buffer \ 81 length */ 82 #define ENH_OVERHANG 2 83 #define ENH_UPS0 4 /* upsampling rate */ 84 #define ENH_FL0 3 /* 2*FLO+1 is the length of each filter */ 85 #define ENH_FLO_MULT2_PLUS1 7 86 #define ENH_VECTL (ENH_BLOCKL + 2 * ENH_FL0) 87 #define ENH_CORRDIM (2 * ENH_SLOP + 1) 88 #define ENH_NBLOCKS (BLOCKL / ENH_BLOCKL) 89 #define ENH_NBLOCKS_EXTRA 5 90 #define ENH_NBLOCKS_TOT 8 /* ENH_NBLOCKS+ENH_NBLOCKS_EXTRA */ 91 #define ENH_BUFL (ENH_NBLOCKS_TOT) * ENH_BLOCKL 92 #define ENH_BUFL_FILTEROVERHEAD 3 93 #define ENH_A0 819 /* Q14 */ 94 #define ENH_A0_MINUS_A0A0DIV4 848256041 /* Q34 */ 95 #define ENH_A0DIV2 26843546 /* Q30 */ 96 97 /* PLC */ 98 99 /* Down sampling */ 100 101 #define FILTERORDER_DS_PLUS1 7 102 #define DELAY_DS 3 103 #define FACTOR_DS 2 104 105 /* bit stream defs */ 106 107 #define NO_OF_BYTES_20MS 38 108 #define NO_OF_BYTES_30MS 50 109 #define NO_OF_WORDS_20MS 19 110 #define NO_OF_WORDS_30MS 25 111 #define STATE_BITS 3 112 #define BYTE_LEN 8 113 #define ULP_CLASSES 3 114 115 /* help parameters */ 116 117 #define TWO_PI_FIX 25736 /* Q12 */ 118 119 /* Constants for codebook search and creation */ 120 121 #define ST_MEM_L_TBL 85 122 #define MEM_LF_TBL 147 123 124 /* Struct for the bits */ 125 typedef struct iLBC_bits_t_ { 126 int16_t lsf[LSF_NSPLIT * LPC_N_MAX]; 127 int16_t cb_index[CB_NSTAGES * (NASUB_MAX + 1)]; /* First CB_NSTAGES values 128 contains extra CB index */ 129 int16_t gain_index[CB_NSTAGES * (NASUB_MAX + 1)]; /* First CB_NSTAGES values 130 contains extra CB gain */ 131 size_t idxForMax; 132 int16_t state_first; 133 int16_t idxVec[STATE_SHORT_LEN_30MS]; 134 int16_t firstbits; 135 size_t startIdx; 136 } iLBC_bits; 137 138 /* type definition encoder instance */ 139 typedef struct IlbcEncoder_ { 140 /* flag for frame size mode */ 141 int16_t mode; 142 143 /* basic parameters for different frame sizes */ 144 size_t blockl; 145 size_t nsub; 146 int16_t nasub; 147 size_t no_of_bytes, no_of_words; 148 int16_t lpc_n; 149 size_t state_short_len; 150 151 /* analysis filter state */ 152 int16_t anaMem[LPC_FILTERORDER]; 153 154 /* Fix-point old lsf parameters for interpolation */ 155 int16_t lsfold[LPC_FILTERORDER]; 156 int16_t lsfdeqold[LPC_FILTERORDER]; 157 158 /* signal buffer for LP analysis */ 159 int16_t lpc_buffer[LPC_LOOKBACK + BLOCKL_MAX]; 160 161 /* state of input HP filter */ 162 int16_t hpimemx[2]; 163 int16_t hpimemy[4]; 164 165 #ifdef SPLIT_10MS 166 int16_t weightdenumbuf[66]; 167 int16_t past_samples[160]; 168 uint16_t bytes[25]; 169 int16_t section; 170 int16_t Nfor_flag; 171 int16_t Nback_flag; 172 int16_t start_pos; 173 size_t diff; 174 #endif 175 176 } IlbcEncoder; 177 178 /* type definition decoder instance */ 179 typedef struct IlbcDecoder_ { 180 /* flag for frame size mode */ 181 int16_t mode; 182 183 /* basic parameters for different frame sizes */ 184 size_t blockl; 185 size_t nsub; 186 int16_t nasub; 187 size_t no_of_bytes, no_of_words; 188 int16_t lpc_n; 189 size_t state_short_len; 190 191 /* synthesis filter state */ 192 int16_t syntMem[LPC_FILTERORDER]; 193 194 /* old LSF for interpolation */ 195 int16_t lsfdeqold[LPC_FILTERORDER]; 196 197 /* pitch lag estimated in enhancer and used in PLC */ 198 size_t last_lag; 199 200 /* PLC state information */ 201 int consPLICount, prev_enh_pl; 202 int16_t perSquare; 203 204 int16_t prevScale, prevPLI; 205 size_t prevLag; 206 int16_t prevLpc[LPC_FILTERORDER + 1]; 207 int16_t prevResidual[NSUB_MAX * SUBL]; 208 int16_t seed; 209 210 /* previous synthesis filter parameters */ 211 212 int16_t old_syntdenum[(LPC_FILTERORDER + 1) * NSUB_MAX]; 213 214 /* state of output HP filter */ 215 int16_t hpimemx[2]; 216 int16_t hpimemy[4]; 217 218 /* enhancer state information */ 219 int use_enhancer; 220 int16_t enh_buf[ENH_BUFL + ENH_BUFL_FILTEROVERHEAD]; 221 size_t enh_period[ENH_NBLOCKS_TOT]; 222 223 } IlbcDecoder; 224 225 #endif 226