| 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 */ |