1 /* 2 * adaptive and fixed codebook vector operations for ACELP-based codecs 3 * 4 * Copyright (c) 2008 Vladimir Voroshilov 5 * 6 * This file is part of FFmpeg. 7 * 8 * FFmpeg is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Lesser General Public 10 * License as published by the Free Software Foundation; either 11 * version 2.1 of the License, or (at your option) any later version. 12 * 13 * FFmpeg is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Lesser General Public License for more details. 17 * 18 * You should have received a copy of the GNU Lesser General Public 19 * License along with FFmpeg; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 21 */ 22 23 #ifndef AVCODEC_ACELP_VECTORS_H 24 #define AVCODEC_ACELP_VECTORS_H 25 26 #include <stdint.h> 27 28 typedef struct ACELPVContext { 29 /** 30 * float implementation of weighted sum of two vectors. 31 * @param[out] out result of addition 32 * @param in_a first vector 33 * @param in_b second vector 34 * @param weight_coeff_a first vector weight coefficient 35 * @param weight_coeff_a second vector weight coefficient 36 * @param length vectors length (should be a multiple of two) 37 * 38 * @note It is safe to pass the same buffer for out and in_a or in_b. 39 */ 40 void (*weighted_vector_sumf)(float *out, const float *in_a, const float *in_b, 41 float weight_coeff_a, float weight_coeff_b, 42 int length); 43 44 }ACELPVContext; 45 46 /** 47 * Initialize ACELPVContext. 48 */ 49 void ff_acelp_vectors_init(ACELPVContext *c); 50 void ff_acelp_vectors_init_mips(ACELPVContext *c); 51 52 /** Sparse representation for the algebraic codebook (fixed) vector */ 53 typedef struct AMRFixed { 54 int n; 55 int x[10]; 56 float y[10]; 57 int no_repeat_mask; 58 int pitch_lag; 59 float pitch_fac; 60 } AMRFixed; 61 62 /** 63 * Track|Pulse| Positions 64 * ------------------------------------------------------------------------- 65 * 1 | 0 | 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75 66 * ------------------------------------------------------------------------- 67 * 2 | 1 | 1, 6, 11, 16, 21, 26, 31, 36, 41, 46, 51, 56, 61, 66, 71, 76 68 * ------------------------------------------------------------------------- 69 * 3 | 2 | 2, 7, 12, 17, 22, 27, 32, 37, 42, 47, 52, 57, 62, 67, 72, 77 70 * ------------------------------------------------------------------------- 71 * 72 * Table contains only first the pulse indexes. 73 * 74 * Used in G.729 @@8k, G.729 @@4.4k, AMR @@7.95k, AMR @@7.40k 75 */ 76 extern const uint8_t ff_fc_4pulses_8bits_tracks_13[16]; 77 78 /** 79 * Track|Pulse| Positions 80 * ------------------------------------------------------------------------- 81 * 4 | 3 | 3, 8, 13, 18, 23, 28, 33, 38, 43, 48, 53, 58, 63, 68, 73, 78 82 * | | 4, 9, 14, 19, 24, 29, 34, 39, 44, 49, 54, 59, 64, 69, 74, 79 83 * ------------------------------------------------------------------------- 84 * 85 * @remark Track in the table should be read top-to-bottom, left-to-right. 86 * 87 * Used in G.729 @@8k, G.729 @@4.4k, AMR @@7.95k, AMR @@7.40k 88 */ 89 extern const uint8_t ff_fc_4pulses_8bits_track_4[32]; 90 91 /** 92 * Track|Pulse| Positions 93 * ----------------------------------------- 94 * 1 | 0 | 1, 6, 11, 16, 21, 26, 31, 36 95 * | | 3, 8, 13, 18, 23, 28, 33, 38 96 * ----------------------------------------- 97 * 98 * @remark Track in the table should be read top-to-bottom, left-to-right. 99 * 100 * @note (EE) Reference G.729D code also uses gray decoding for each 101 * pulse index before looking up the value in the table. 102 * 103 * Used in G.729 @@6.4k (with gray coding), AMR @@5.9k (without gray coding) 104 */ 105 extern const uint8_t ff_fc_2pulses_9bits_track1[16]; 106 extern const uint8_t ff_fc_2pulses_9bits_track1_gray[16]; 107 108 /** 109 * Track|Pulse| Positions 110 * ----------------------------------------- 111 * 2 | 1 | 0, 7, 14, 20, 27, 34, 1, 21 112 * | | 2, 9, 15, 22, 29, 35, 6, 26 113 * | | 4,10, 17, 24, 30, 37, 11, 31 114 * | | 5,12, 19, 25, 32, 39, 16, 36 115 * ----------------------------------------- 116 * 117 * @remark Track in the table should be read top-to-bottom, left-to-right. 118 * 119 * @note (EE.1) This table (from the reference code) does not comply with 120 * the specification. 121 * The specification contains the following table: 122 * 123 * Track|Pulse| Positions 124 * ----------------------------------------- 125 * 2 | 1 | 0, 5, 10, 15, 20, 25, 30, 35 126 * | | 1, 6, 11, 16, 21, 26, 31, 36 127 * | | 2, 7, 12, 17, 22, 27, 32, 37 128 * | | 4, 9, 14, 19, 24, 29, 34, 39 129 * 130 * ----------------------------------------- 131 * 132 * @note (EE.2) Reference G.729D code also uses gray decoding for each 133 * pulse index before looking up the value in the table. 134 * 135 * Used in G.729 @@6.4k (with gray coding) 136 */ 137 extern const uint8_t ff_fc_2pulses_9bits_track2_gray[32]; 138 139 /** 140 * b60 hamming windowed sinc function coefficients 141 */ 142 extern const float ff_b60_sinc[61]; 143 144 /** 145 * Table of pow(0.7,n) 146 */ 147 extern const float ff_pow_0_7[10]; 148 149 /** 150 * Table of pow(0.75,n) 151 */ 152 extern const float ff_pow_0_75[10]; 153 154 /** 155 * Table of pow(0.55,n) 156 */ 157 extern const float ff_pow_0_55[10]; 158 159 /** 160 * Decode fixed-codebook vector (3.8 and D.5.8 of G.729, 5.7.1 of AMR). 161 * @param[out] fc_v decoded fixed codebook vector (2.13) 162 * @param tab1 table used for first pulse_count pulses 163 * @param tab2 table used for last pulse 164 * @param pulse_indexes fixed codebook indexes 165 * @param pulse_signs signs of the excitation pulses (0 bit value 166 * means negative sign) 167 * @param bits number of bits per one pulse index 168 * @param pulse_count number of pulses decoded using first table 169 * @param bits length of one pulse index in bits 170 * 171 * Used in G.729 @@8k, G.729 @@4.4k, G.729 @@6.4k, AMR @@7.95k, AMR @@7.40k 172 */ 173 void ff_acelp_fc_pulse_per_track(int16_t* fc_v, 174 const uint8_t *tab1, 175 const uint8_t *tab2, 176 int pulse_indexes, 177 int pulse_signs, 178 int pulse_count, 179 int bits); 180 181 /** 182 * Decode the algebraic codebook index to pulse positions and signs and 183 * construct the algebraic codebook vector for MODE_12k2. 184 * 185 * @note: The positions and signs are explicitly coded in MODE_12k2. 186 * 187 * @param fixed_index positions of the ten pulses 188 * @param fixed_sparse pointer to the algebraic codebook vector 189 * @param gray_decode gray decoding table 190 * @param half_pulse_count number of couples of pulses 191 * @param bits length of one pulse index in bits 192 */ 193 void ff_decode_10_pulses_35bits(const int16_t *fixed_index, 194 AMRFixed *fixed_sparse, 195 const uint8_t *gray_decode, 196 int half_pulse_count, int bits); 197 198 199 /** 200 * weighted sum of two vectors with rounding. 201 * @param[out] out result of addition 202 * @param in_a first vector 203 * @param in_b second vector 204 * @param weight_coeff_a first vector weight coefficient 205 * @param weight_coeff_a second vector weight coefficient 206 * @param rounder this value will be added to the sum of the two vectors 207 * @param shift result will be shifted to right by this value 208 * @param length vectors length 209 * 210 * @note It is safe to pass the same buffer for out and in_a or in_b. 211 * 212 * out[i] = (in_a[i]*weight_a + in_b[i]*weight_b + rounder) >> shift 213 */ 214 void ff_acelp_weighted_vector_sum(int16_t* out, 215 const int16_t *in_a, 216 const int16_t *in_b, 217 int16_t weight_coeff_a, 218 int16_t weight_coeff_b, 219 int16_t rounder, 220 int shift, 221 int length); 222 223 /** 224 * float implementation of weighted sum of two vectors. 225 * @param[out] out result of addition 226 * @param in_a first vector 227 * @param in_b second vector 228 * @param weight_coeff_a first vector weight coefficient 229 * @param weight_coeff_a second vector weight coefficient 230 * @param length vectors length 231 * 232 * @note It is safe to pass the same buffer for out and in_a or in_b. 233 */ 234 void ff_weighted_vector_sumf(float *out, const float *in_a, const float *in_b, 235 float weight_coeff_a, float weight_coeff_b, 236 int length); 237 238 /** 239 * Adaptive gain control (as used in AMR postfiltering) 240 * 241 * @param out output buffer for filtered speech data 242 * @param in the input speech buffer (may be the same as out) 243 * @param speech_energ input energy 244 * @param size the input buffer size 245 * @param alpha exponential filter factor 246 * @param gain_mem a pointer to the filter memory (single float of size) 247 */ 248 void ff_adaptive_gain_control(float *out, const float *in, float speech_energ, 249 int size, float alpha, float *gain_mem); 250 251 /** 252 * Set the sum of squares of a signal by scaling 253 * 254 * @param out output samples 255 * @param in input samples 256 * @param sum_of_squares new sum of squares 257 * @param n number of samples 258 * 259 * @note If the input is zero (or its energy underflows), the output is zero. 260 * This is the behavior of AGC in the AMR reference decoder. The QCELP 261 * reference decoder seems to have undefined behavior. 262 * 263 * TIA/EIA/IS-733 2.4.8.3-2/3/4/5, 2.4.8.6 264 * 3GPP TS 26.090 6.1 (6) 265 */ 266 void ff_scale_vector_to_given_sum_of_squares(float *out, const float *in, 267 float sum_of_squares, const int n); 268 269 /** 270 * Add fixed vector to an array from a sparse representation 271 * 272 * @param out fixed vector with pitch sharpening 273 * @param in sparse fixed vector 274 * @param scale number to multiply the fixed vector by 275 * @param size the output vector size 276 */ 277 void ff_set_fixed_vector(float *out, const AMRFixed *in, float scale, int size); 278 279 /** 280 * Clear array values set by set_fixed_vector 281 * 282 * @param out fixed vector to be cleared 283 * @param in sparse fixed vector 284 * @param size the output vector size 285 */ 286 void ff_clear_fixed_vector(float *out, const AMRFixed *in, int size); 287 288 #endif /* AVCODEC_ACELP_VECTORS_H */ 289