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