/*
  * adaptive and fixed codebook vector operations for ACELP-based codecs
  *
  * Copyright (c) 2008 Vladimir Voroshilov
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <inttypes.h>

 
 #include "libavutil/common.h"

 #include "libavutil/float_dsp.h"

 #include "avcodec.h"
 #include "acelp_vectors.h"
 
 const uint8_t ff_fc_2pulses_9bits_track1[16] =
 {
     1,  3,
     6,  8,
     11, 13,
     16, 18,
     21, 23,
     26, 28,
     31, 33,
     36, 38
 };
 const uint8_t ff_fc_2pulses_9bits_track1_gray[16] =
 {
   1,  3,
   8,  6,
   18, 16,
   11, 13,
   38, 36,
   31, 33,
   21, 23,
   28, 26,
 };
 

 const uint8_t ff_fc_2pulses_9bits_track2_gray[32] =
 {
   0,  2,
   5,  4,
   12, 10,
   7,  9,
   25, 24,
   20, 22,
   14, 15,
   19, 17,
   36, 31,
   21, 26,
   1,  6,
   16, 11,
   27, 29,
   32, 30,
   39, 37,
   34, 35,
 };
 

 const uint8_t ff_fc_4pulses_8bits_tracks_13[16] =
 {
   0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75,
 };
 
 const uint8_t ff_fc_4pulses_8bits_track_4[32] =
 {
     3,  4,
     8,  9,
     13, 14,
     18, 19,
     23, 24,
     28, 29,
     33, 34,
     38, 39,
     43, 44,
     48, 49,
     53, 54,
     58, 59,
     63, 64,
     68, 69,
     73, 74,
     78, 79,
 };
 

 const float ff_pow_0_7[10] = {
     0.700000, 0.490000, 0.343000, 0.240100, 0.168070,
     0.117649, 0.082354, 0.057648, 0.040354, 0.028248
 };
 
 const float ff_pow_0_75[10] = {
     0.750000, 0.562500, 0.421875, 0.316406, 0.237305,
     0.177979, 0.133484, 0.100113, 0.075085, 0.056314
 };
 
 const float ff_pow_0_55[10] = {
     0.550000, 0.302500, 0.166375, 0.091506, 0.050328,
     0.027681, 0.015224, 0.008373, 0.004605, 0.002533
 };
 
 const float ff_b60_sinc[61] = {
  0.898529  ,  0.865051  ,  0.769257  ,  0.624054  ,  0.448639  ,  0.265289   ,
  0.0959167 , -0.0412598 , -0.134338  , -0.178986  , -0.178528  , -0.142609   ,
 -0.0849304 , -0.0205078 ,  0.0369568 ,  0.0773926 ,  0.0955200 ,  0.0912781  ,
  0.0689392 ,  0.0357056 ,  0.        , -0.0305481 , -0.0504150 , -0.0570068  ,
 -0.0508423 , -0.0350037 , -0.0141602 ,  0.00665283,  0.0230713 ,  0.0323486  ,
  0.0335388 ,  0.0275879 ,  0.0167847 ,  0.00411987, -0.00747681, -0.0156860  ,
 -0.0193481 , -0.0183716 , -0.0137634 , -0.00704956,  0.        ,  0.00582886 ,
  0.00939941,  0.0103760 ,  0.00903320,  0.00604248,  0.00238037, -0.00109863 ,
 -0.00366211, -0.00497437, -0.00503540, -0.00402832, -0.00241089, -0.000579834,
  0.00103760,  0.00222778,  0.00277710,  0.00271606,  0.00213623,  0.00115967 ,
  0.
 };
 

 void ff_acelp_fc_pulse_per_track(
         int16_t* fc_v,
         const uint8_t *tab1,
         const uint8_t *tab2,

         int pulse_indexes,

         int pulse_signs,
         int pulse_count,
         int bits)
 {
     int mask = (1 << bits) - 1;
     int i;
 
     for(i=0; i<pulse_count; i++)
     {

         fc_v[i + tab1[pulse_indexes & mask]] +=

                 (pulse_signs & 1) ? 8191 : -8192; // +/-1 in (2.13)
 

         pulse_indexes >>= bits;

         pulse_signs >>= 1;
     }
 

     fc_v[tab2[pulse_indexes]] += (pulse_signs & 1) ? 8191 : -8192;

 }
 

 void ff_decode_10_pulses_35bits(const int16_t *fixed_index,
                                 AMRFixed *fixed_sparse,
                                 const uint8_t *gray_decode,
                                 int half_pulse_count, int bits)
 {
     int i;
     int mask = (1 << bits) - 1;
 

     fixed_sparse->no_repeat_mask = 0;

     fixed_sparse->n = 2 * half_pulse_count;
     for (i = 0; i < half_pulse_count; i++) {
         const int pos1   = gray_decode[fixed_index[2*i+1] & mask] + i;
         const int pos2   = gray_decode[fixed_index[2*i  ] & mask] + i;
         const float sign = (fixed_index[2*i+1] & (1 << bits)) ? -1.0 : 1.0;
         fixed_sparse->x[2*i+1] = pos1;
         fixed_sparse->x[2*i  ] = pos2;
         fixed_sparse->y[2*i+1] = sign;
         fixed_sparse->y[2*i  ] = pos2 < pos1 ? -sign : sign;
     }
 }
 

 void ff_acelp_weighted_vector_sum(
         int16_t* out,
         const int16_t *in_a,
         const int16_t *in_b,
         int16_t weight_coeff_a,
         int16_t weight_coeff_b,
         int16_t rounder,
         int shift,
         int length)
 {
     int i;
 
     // Clipping required here; breaks OVERFLOW test.
     for(i=0; i<length; i++)
         out[i] = av_clip_int16((
                  in_a[i] * weight_coeff_a +
                  in_b[i] * weight_coeff_b +
                  rounder) >> shift);
 }

 
 void ff_weighted_vector_sumf(float *out, const float *in_a, const float *in_b,
                              float weight_coeff_a, float weight_coeff_b, int length)
 {
     int i;
 
     for(i=0; i<length; i++)
         out[i] = weight_coeff_a * in_a[i]
                + weight_coeff_b * in_b[i];
 }

 void ff_adaptive_gain_control(float *out, const float *in, float speech_energ,

                               int size, float alpha, float *gain_mem)

 {
     int i;

     float postfilter_energ = avpriv_scalarproduct_float_c(in, in, size);

     float gain_scale_factor = 1.0;
     float mem = *gain_mem;
 
     if (postfilter_energ)
         gain_scale_factor = sqrt(speech_energ / postfilter_energ);
 
     gain_scale_factor *= 1.0 - alpha;
 
     for (i = 0; i < size; i++) {
         mem = alpha * mem + gain_scale_factor;

         out[i] = in[i] * mem;

     }
 
     *gain_mem = mem;
 }

 
 void ff_scale_vector_to_given_sum_of_squares(float *out, const float *in,
                                              float sum_of_squares, const int n)
 {
     int i;

     float scalefactor = avpriv_scalarproduct_float_c(in, in, n);

     if (scalefactor)
         scalefactor = sqrt(sum_of_squares / scalefactor);
     for (i = 0; i < n; i++)
         out[i] = in[i] * scalefactor;
 }

 
 void ff_set_fixed_vector(float *out, const AMRFixed *in, float scale, int size)
 {
     int i;
 
     for (i=0; i < in->n; i++) {

         int x   = in->x[i], repeats = !((in->no_repeat_mask >> i) & 1);

         float y = in->y[i] * scale;
 

         if (in->pitch_lag > 0)

             do {
                 out[x] += y;
                 y *= in->pitch_fac;
                 x += in->pitch_lag;
             } while (x < size && repeats);

     }
 }
 
 void ff_clear_fixed_vector(float *out, const AMRFixed *in, int size)
 {
     int i;
 
     for (i=0; i < in->n; i++) {

         int x  = in->x[i], repeats = !((in->no_repeat_mask >> i) & 1);

         if (in->pitch_lag > 0)

             do {
                 out[x] = 0.0;
                 x += in->pitch_lag;
             } while (x < size && repeats);

     }
 }

 
 void ff_acelp_vectors_init(ACELPVContext *c)
 {
     c->weighted_vector_sumf   = ff_weighted_vector_sumf;
 
     if(HAVE_MIPSFPU)
         ff_acelp_vectors_init_mips(c);
 }