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/*
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 * adaptive and fixed codebook vector operations for ACELP-based codecs
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 *
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 * Copyright (c) 2008 Vladimir Voroshilov
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 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include <inttypes.h>
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#include "avcodec.h"
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#include "acelp_vectors.h"
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#include "celp_math.h"
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const uint8_t ff_fc_2pulses_9bits_track1[16] =
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{
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    1,  3,
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    6,  8,
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    11, 13,
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    16, 18,
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    21, 23,
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    26, 28,
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    31, 33,
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    36, 38
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};
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const uint8_t ff_fc_2pulses_9bits_track1_gray[16] =
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{
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  1,  3,
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  8,  6,
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  18, 16,
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  11, 13,
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  38, 36,
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  31, 33,
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  21, 23,
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  28, 26,
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};
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const uint8_t ff_fc_2pulses_9bits_track2_gray[32] =
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{
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  0,  2,
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  5,  4,
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  12, 10,
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  7,  9,
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  25, 24,
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  20, 22,
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  14, 15,
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  19, 17,
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  36, 31,
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  21, 26,
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  1,  6,
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  16, 11,
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  27, 29,
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  32, 30,
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  39, 37,
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  34, 35,
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};
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const uint8_t ff_fc_4pulses_8bits_tracks_13[16] =
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{
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  0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75,
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};
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const uint8_t ff_fc_4pulses_8bits_track_4[32] =
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{
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    3,  4,
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    8,  9,
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    13, 14,
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    18, 19,
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    23, 24,
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    28, 29,
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    33, 34,
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    38, 39,
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    43, 44,
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    48, 49,
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    53, 54,
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    58, 59,
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    63, 64,
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    68, 69,
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    73, 74,
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    78, 79,
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};
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#if 0
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static uint8_t gray_decode[32] =
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{
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    0,  1,  3,  2,  7,  6,  4,  5,
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   15, 14, 12, 13,  8,  9, 11, 10,
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   31, 30, 28, 29, 24, 25, 27, 26,
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   16, 17, 19, 18, 23, 22, 20, 21
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};
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#endif
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const float ff_pow_0_7[10] = {
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    0.700000, 0.490000, 0.343000, 0.240100, 0.168070,
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    0.117649, 0.082354, 0.057648, 0.040354, 0.028248
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};
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const float ff_pow_0_75[10] = {
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    0.750000, 0.562500, 0.421875, 0.316406, 0.237305,
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    0.177979, 0.133484, 0.100113, 0.075085, 0.056314
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};
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const float ff_pow_0_55[10] = {
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    0.550000, 0.302500, 0.166375, 0.091506, 0.050328,
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    0.027681, 0.015224, 0.008373, 0.004605, 0.002533
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};
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const float ff_b60_sinc[61] = {
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 0.898529  ,  0.865051  ,  0.769257  ,  0.624054  ,  0.448639  ,  0.265289   ,
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 0.0959167 , -0.0412598 , -0.134338  , -0.178986  , -0.178528  , -0.142609   ,
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-0.0849304 , -0.0205078 ,  0.0369568 ,  0.0773926 ,  0.0955200 ,  0.0912781  ,
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 0.0689392 ,  0.0357056 ,  0.        , -0.0305481 , -0.0504150 , -0.0570068  ,
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-0.0508423 , -0.0350037 , -0.0141602 ,  0.00665283,  0.0230713 ,  0.0323486  ,
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 0.0335388 ,  0.0275879 ,  0.0167847 ,  0.00411987, -0.00747681, -0.0156860  ,
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-0.0193481 , -0.0183716 , -0.0137634 , -0.00704956,  0.        ,  0.00582886 ,
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 0.00939941,  0.0103760 ,  0.00903320,  0.00604248,  0.00238037, -0.00109863 ,
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-0.00366211, -0.00497437, -0.00503540, -0.00402832, -0.00241089, -0.000579834,
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 0.00103760,  0.00222778,  0.00277710,  0.00271606,  0.00213623,  0.00115967 ,
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 0.
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};
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void ff_acelp_fc_pulse_per_track(
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        int16_t* fc_v,
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        const uint8_t *tab1,
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        const uint8_t *tab2,
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        int pulse_indexes,
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        int pulse_signs,
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        int pulse_count,
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        int bits)
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{
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    int mask = (1 << bits) - 1;
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    int i;
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    for(i=0; i<pulse_count; i++)
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    {
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        fc_v[i + tab1[pulse_indexes & mask]] +=
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                (pulse_signs & 1) ? 8191 : -8192; // +/-1 in (2.13)
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        pulse_indexes >>= bits;
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        pulse_signs >>= 1;
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    }
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    fc_v[tab2[pulse_indexes]] += (pulse_signs & 1) ? 8191 : -8192;
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}
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void ff_decode_10_pulses_35bits(const int16_t *fixed_index,
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                                AMRFixed *fixed_sparse,
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                                const uint8_t *gray_decode,
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                                int half_pulse_count, int bits)
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{
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    int i;
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    int mask = (1 << bits) - 1;
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    fixed_sparse->no_repeat_mask = 0;
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    fixed_sparse->n = 2 * half_pulse_count;
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    for (i = 0; i < half_pulse_count; i++) {
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        const int pos1   = gray_decode[fixed_index[2*i+1] & mask] + i;
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        const int pos2   = gray_decode[fixed_index[2*i  ] & mask] + i;
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        const float sign = (fixed_index[2*i+1] & (1 << bits)) ? -1.0 : 1.0;
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        fixed_sparse->x[2*i+1] = pos1;
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        fixed_sparse->x[2*i  ] = pos2;
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        fixed_sparse->y[2*i+1] = sign;
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        fixed_sparse->y[2*i  ] = pos2 < pos1 ? -sign : sign;
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    }
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}
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void ff_acelp_weighted_vector_sum(
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        int16_t* out,
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        const int16_t *in_a,
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        const int16_t *in_b,
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        int16_t weight_coeff_a,
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        int16_t weight_coeff_b,
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        int16_t rounder,
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        int shift,
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        int length)
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{
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    int i;
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    // Clipping required here; breaks OVERFLOW test.
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    for(i=0; i<length; i++)
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        out[i] = av_clip_int16((
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                 in_a[i] * weight_coeff_a +
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                 in_b[i] * weight_coeff_b +
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                 rounder) >> shift);
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}
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void ff_weighted_vector_sumf(float *out, const float *in_a, const float *in_b,
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                             float weight_coeff_a, float weight_coeff_b, int length)
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{
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    int i;
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    for(i=0; i<length; i++)
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        out[i] = weight_coeff_a * in_a[i]
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               + weight_coeff_b * in_b[i];
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}
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void ff_adaptive_gain_control(float *out, const float *in, float speech_energ,
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                              int size, float alpha, float *gain_mem)
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{
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    int i;
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    float postfilter_energ = ff_dot_productf(in, in, size);
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    float gain_scale_factor = 1.0;
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    float mem = *gain_mem;
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    if (postfilter_energ)
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        gain_scale_factor = sqrt(speech_energ / postfilter_energ);
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    gain_scale_factor *= 1.0 - alpha;
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    for (i = 0; i < size; i++) {
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        mem = alpha * mem + gain_scale_factor;
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        out[i] = in[i] * mem;
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    }
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    *gain_mem = mem;
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}
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void ff_scale_vector_to_given_sum_of_squares(float *out, const float *in,
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                                             float sum_of_squares, const int n)
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{
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    int i;
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    float scalefactor = ff_dot_productf(in, in, n);
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    if (scalefactor)
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        scalefactor = sqrt(sum_of_squares / scalefactor);
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    for (i = 0; i < n; i++)
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        out[i] = in[i] * scalefactor;
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}
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void ff_set_fixed_vector(float *out, const AMRFixed *in, float scale, int size)
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{
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    int i;
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    for (i=0; i < in->n; i++) {
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        int x   = in->x[i], repeats = !((in->no_repeat_mask >> i) & 1);
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        float y = in->y[i] * scale;
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        do {
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            out[x] += y;
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            y *= in->pitch_fac;
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            x += in->pitch_lag;
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        } while (x < size && repeats);
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    }
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}
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void ff_clear_fixed_vector(float *out, const AMRFixed *in, int size)
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{
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    int i;
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    for (i=0; i < in->n; i++) {
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        int x  = in->x[i], repeats = !((in->no_repeat_mask >> i) & 1);
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        do {
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            out[x] = 0.0;
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            x += in->pitch_lag;
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        } while (x < size && repeats);
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    }
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}