libavcodec/acelp_vectors.c

   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 Libav.
   7  *
   8  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #include <inttypes.h>
  24
  25 #include "libavutil/common.h"
  26 #include "libavutil/float_dsp.h"
  27 #include "avcodec.h"
  28 #include "acelp_vectors.h"
  29
  30 const uint8_t ff_fc_2pulses_9bits_track1[16] =
  31 {
  32     1,  3,
  33     6,  8,
  34     11, 13,
  35     16, 18,
  36     21, 23,
  37     26, 28,
  38     31, 33,
  39     36, 38
  40 };
  41 const uint8_t ff_fc_2pulses_9bits_track1_gray[16] =
  42 {
  43   1,  3,
  44   8,  6,
  45   18, 16,
  46   11, 13,
  47   38, 36,
  48   31, 33,
  49   21, 23,
  50   28, 26,
  51 };
  52
  53 const uint8_t ff_fc_4pulses_8bits_tracks_13[16] =
  54 {
  55   0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75,
  56 };
  57
  58 const uint8_t ff_fc_4pulses_8bits_track_4[32] =
  59 {
  60     3,  4,
  61     8,  9,
  62     13, 14,
  63     18, 19,
  64     23, 24,
  65     28, 29,
  66     33, 34,
  67     38, 39,
  68     43, 44,
  69     48, 49,
  70     53, 54,
  71     58, 59,
  72     63, 64,
  73     68, 69,
  74     73, 74,
  75     78, 79,
  76 };
  77
  78 const float ff_pow_0_7[10] = {
  79     0.700000, 0.490000, 0.343000, 0.240100, 0.168070,
  80     0.117649, 0.082354, 0.057648, 0.040354, 0.028248
  81 };
  82
  83 const float ff_pow_0_75[10] = {
  84     0.750000, 0.562500, 0.421875, 0.316406, 0.237305,
  85     0.177979, 0.133484, 0.100113, 0.075085, 0.056314
  86 };
  87
  88 const float ff_pow_0_55[10] = {
  89     0.550000, 0.302500, 0.166375, 0.091506, 0.050328,
  90     0.027681, 0.015224, 0.008373, 0.004605, 0.002533
  91 };
  92
  93 const float ff_b60_sinc[61] = {
  94  0.898529  ,  0.865051  ,  0.769257  ,  0.624054  ,  0.448639  ,  0.265289   ,
  95  0.0959167 , -0.0412598 , -0.134338  , -0.178986  , -0.178528  , -0.142609   ,
  96 -0.0849304 , -0.0205078 ,  0.0369568 ,  0.0773926 ,  0.0955200 ,  0.0912781  ,
  97  0.0689392 ,  0.0357056 ,  0.        , -0.0305481 , -0.0504150 , -0.0570068  ,
  98 -0.0508423 , -0.0350037 , -0.0141602 ,  0.00665283,  0.0230713 ,  0.0323486  ,
  99  0.0335388 ,  0.0275879 ,  0.0167847 ,  0.00411987, -0.00747681, -0.0156860  ,
 100 -0.0193481 , -0.0183716 , -0.0137634 , -0.00704956,  0.        ,  0.00582886 ,
 101  0.00939941,  0.0103760 ,  0.00903320,  0.00604248,  0.00238037, -0.00109863 ,
 102 -0.00366211, -0.00497437, -0.00503540, -0.00402832, -0.00241089, -0.000579834,
 103  0.00103760,  0.00222778,  0.00277710,  0.00271606,  0.00213623,  0.00115967 ,
 104  0.
 105 };
 106
 107 void ff_acelp_fc_pulse_per_track(
 108         int16_t* fc_v,
 109         const uint8_t *tab1,
 110         const uint8_t *tab2,
 111         int pulse_indexes,
 112         int pulse_signs,
 113         int pulse_count,
 114         int bits)
 115 {
 116     int mask = (1 << bits) - 1;
 117     int i;
 118
 119     for(i=0; i<pulse_count; i++)
 120     {
 121         fc_v[i + tab1[pulse_indexes & mask]] +=
 122                 (pulse_signs & 1) ? 8191 : -8192; // +/-1 in (2.13)
 123
 124         pulse_indexes >>= bits;
 125         pulse_signs >>= 1;
 126     }
 127
 128     fc_v[tab2[pulse_indexes]] += (pulse_signs & 1) ? 8191 : -8192;
 129 }
 130
 131 void ff_decode_10_pulses_35bits(const int16_t *fixed_index,
 132                                 AMRFixed *fixed_sparse,
 133                                 const uint8_t *gray_decode,
 134                                 int half_pulse_count, int bits)
 135 {
 136     int i;
 137     int mask = (1 << bits) - 1;
 138
 139     fixed_sparse->no_repeat_mask = 0;
 140     fixed_sparse->n = 2 * half_pulse_count;
 141     for (i = 0; i < half_pulse_count; i++) {
 142         const int pos1   = gray_decode[fixed_index[2*i+1] & mask] + i;
 143         const int pos2   = gray_decode[fixed_index[2*i  ] & mask] + i;
 144         const float sign = (fixed_index[2*i+1] & (1 << bits)) ? -1.0 : 1.0;
 145         fixed_sparse->x[2*i+1] = pos1;
 146         fixed_sparse->x[2*i  ] = pos2;
 147         fixed_sparse->y[2*i+1] = sign;
 148         fixed_sparse->y[2*i  ] = pos2 < pos1 ? -sign : sign;
 149     }
 150 }
 151
 152 void ff_acelp_weighted_vector_sum(
 153         int16_t* out,
 154         const int16_t *in_a,
 155         const int16_t *in_b,
 156         int16_t weight_coeff_a,
 157         int16_t weight_coeff_b,
 158         int16_t rounder,
 159         int shift,
 160         int length)
 161 {
 162     int i;
 163
 164     // Clipping required here; breaks OVERFLOW test.
 165     for(i=0; i<length; i++)
 166         out[i] = av_clip_int16((
 167                  in_a[i] * weight_coeff_a +
 168                  in_b[i] * weight_coeff_b +
 169                  rounder) >> shift);
 170 }
 171
 172 void ff_weighted_vector_sumf(float *out, const float *in_a, const float *in_b,
 173                              float weight_coeff_a, float weight_coeff_b, int length)
 174 {
 175     int i;
 176
 177     for(i=0; i<length; i++)
 178         out[i] = weight_coeff_a * in_a[i]
 179                + weight_coeff_b * in_b[i];
 180 }
 181
 182 void ff_adaptive_gain_control(float *out, const float *in, float speech_energ,
 183                               int size, float alpha, float *gain_mem)
 184 {
 185     int i;
 186     float postfilter_energ = avpriv_scalarproduct_float_c(in, in, size);
 187     float gain_scale_factor = 1.0;
 188     float mem = *gain_mem;
 189
 190     if (postfilter_energ)
 191         gain_scale_factor = sqrt(speech_energ / postfilter_energ);
 192
 193     gain_scale_factor *= 1.0 - alpha;
 194
 195     for (i = 0; i < size; i++) {
 196         mem = alpha * mem + gain_scale_factor;
 197         out[i] = in[i] * mem;
 198     }
 199
 200     *gain_mem = mem;
 201 }
 202
 203 void ff_scale_vector_to_given_sum_of_squares(float *out, const float *in,
 204                                              float sum_of_squares, const int n)
 205 {
 206     int i;
 207     float scalefactor = avpriv_scalarproduct_float_c(in, in, n);
 208     if (scalefactor)
 209         scalefactor = sqrt(sum_of_squares / scalefactor);
 210     for (i = 0; i < n; i++)
 211         out[i] = in[i] * scalefactor;
 212 }
 213
 214 void ff_set_fixed_vector(float *out, const AMRFixed *in, float scale, int size)
 215 {
 216     int i;
 217
 218     for (i=0; i < in->n; i++) {
 219         int x   = in->x[i], repeats = !((in->no_repeat_mask >> i) & 1);
 220         float y = in->y[i] * scale;
 221
 222         do {
 223             out[x] += y;
 224             y *= in->pitch_fac;
 225             x += in->pitch_lag;
 226         } while (x < size && repeats);
 227     }
 228 }
 229
 230 void ff_clear_fixed_vector(float *out, const AMRFixed *in, int size)
 231 {
 232     int i;
 233
 234     for (i=0; i < in->n; i++) {
 235         int x  = in->x[i], repeats = !((in->no_repeat_mask >> i) & 1);
 236
 237         do {
 238             out[x] = 0.0;
 239             x += in->pitch_lag;
 240         } while (x < size && repeats);
 241     }
 242 }