/*
  * 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
  */
 

 #ifndef AVCODEC_ACELP_VECTORS_H
 #define AVCODEC_ACELP_VECTORS_H

 #include <stdint.h>
 

 typedef struct ACELPVContext {
     /**
      * float implementation of weighted sum of two vectors.
      * @param[out] out result of addition
      * @param in_a first vector
      * @param in_b second vector
      * @param weight_coeff_a first vector weight coefficient
      * @param weight_coeff_a second vector weight coefficient
      * @param length vectors length (should be a multiple of two)
      *
      * @note It is safe to pass the same buffer for out and in_a or in_b.
      */
     void (*weighted_vector_sumf)(float *out, const float *in_a, const float *in_b,
                                  float weight_coeff_a, float weight_coeff_b,
                                  int length);
 
 }ACELPVContext;
 
 /**
  * Initialize ACELPVContext.
  */
 void ff_acelp_vectors_init(ACELPVContext *c);
 void ff_acelp_vectors_init_mips(ACELPVContext *c);
 

 /** Sparse representation for the algebraic codebook (fixed) vector */

 typedef struct AMRFixed {

     int      n;
     int      x[10];
     float    y[10];

     int      no_repeat_mask;

     int      pitch_lag;
     float    pitch_fac;
 } AMRFixed;
 

 /**

  * Track|Pulse|        Positions
  * -------------------------------------------------------------------------
  *  1   | 0   | 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75
  * -------------------------------------------------------------------------
  *  2   | 1   | 1, 6, 11, 16, 21, 26, 31, 36, 41, 46, 51, 56, 61, 66, 71, 76
  * -------------------------------------------------------------------------
  *  3   | 2   | 2, 7, 12, 17, 22, 27, 32, 37, 42, 47, 52, 57, 62, 67, 72, 77
  * -------------------------------------------------------------------------
  *
  * Table contains only first the pulse indexes.
  *

  * Used in G.729 @@8k, G.729 @@4.4k, AMR @@7.95k, AMR @@7.40k

  */
 extern const uint8_t ff_fc_4pulses_8bits_tracks_13[16];
 

 /**

  * Track|Pulse|        Positions
  * -------------------------------------------------------------------------
  *  4   | 3   | 3, 8, 13, 18, 23, 28, 33, 38, 43, 48, 53, 58, 63, 68, 73, 78
  *      |     | 4, 9, 14, 19, 24, 29, 34, 39, 44, 49, 54, 59, 64, 69, 74, 79
  * -------------------------------------------------------------------------
  *

  * @remark Track in the table should be read top-to-bottom, left-to-right.

  *

  * Used in G.729 @@8k, G.729 @@4.4k, AMR @@7.95k, AMR @@7.40k

  */
 extern const uint8_t ff_fc_4pulses_8bits_track_4[32];
 

 /**

  * Track|Pulse|        Positions
  * -----------------------------------------
  *  1   | 0   | 1, 6, 11, 16, 21, 26, 31, 36
  *      |     | 3, 8, 13, 18, 23, 28, 33, 38
  * -----------------------------------------
  *

  * @remark Track in the table should be read top-to-bottom, left-to-right.

  *

  * @note (EE) Reference G.729D code also uses gray decoding for each

  *            pulse index before looking up the value in the table.
  *

  * Used in G.729 @@6.4k (with gray coding), AMR @@5.9k (without gray coding)

  */
 extern const uint8_t ff_fc_2pulses_9bits_track1[16];
 extern const uint8_t ff_fc_2pulses_9bits_track1_gray[16];
 

 /**

  * Track|Pulse|        Positions
  * -----------------------------------------
  *  2   | 1   | 0, 7, 14, 20, 27, 34,  1, 21
  *      |     | 2, 9, 15, 22, 29, 35,  6, 26
  *      |     | 4,10, 17, 24, 30, 37, 11, 31
  *      |     | 5,12, 19, 25, 32, 39, 16, 36
  * -----------------------------------------
  *
  * @remark Track in the table should be read top-to-bottom, left-to-right.
  *
  * @note (EE.1) This table (from the reference code) does not comply with
  *              the specification.
  *              The specification contains the following table:
  *
  * Track|Pulse|        Positions
  * -----------------------------------------
  *  2   | 1   | 0, 5, 10, 15, 20, 25, 30, 35
  *      |     | 1, 6, 11, 16, 21, 26, 31, 36
  *      |     | 2, 7, 12, 17, 22, 27, 32, 37
  *      |     | 4, 9, 14, 19, 24, 29, 34, 39
  *
  * -----------------------------------------
  *
  * @note (EE.2) Reference G.729D code also uses gray decoding for each
  *              pulse index before looking up the value in the table.
  *
  * Used in G.729 @@6.4k (with gray coding)
  */
 extern const uint8_t ff_fc_2pulses_9bits_track2_gray[32];
 
 /**

  * b60 hamming windowed sinc function coefficients
  */
 extern const float ff_b60_sinc[61];
 
 /**
  * Table of pow(0.7,n)
  */
 extern const float ff_pow_0_7[10];
 
 /**
  * Table of pow(0.75,n)
  */
 extern const float ff_pow_0_75[10];
 
 /**
  * Table of pow(0.55,n)
  */
 extern const float ff_pow_0_55[10];
 
 /**

  * Decode fixed-codebook vector (3.8 and D.5.8 of G.729, 5.7.1 of AMR).

  * @param[out] fc_v decoded fixed codebook vector (2.13)

  * @param tab1 table used for first pulse_count pulses
  * @param tab2 table used for last pulse
  * @param pulse_indexes fixed codebook indexes
  * @param pulse_signs signs of the excitation pulses (0 bit value

  *                     means negative sign)

  * @param bits number of bits per one pulse index
  * @param pulse_count number of pulses decoded using first table
  * @param bits length of one pulse index in bits

  *

  * Used in G.729 @@8k, G.729 @@4.4k, G.729 @@6.4k, AMR @@7.95k, AMR @@7.40k

  */

 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);

 
 /**

  * Decode the algebraic codebook index to pulse positions and signs and
  * construct the algebraic codebook vector for MODE_12k2.
  *
  * @note: The positions and signs are explicitly coded in MODE_12k2.
  *
  * @param fixed_index          positions of the ten pulses
  * @param fixed_sparse         pointer to the algebraic codebook vector
  * @param gray_decode          gray decoding table
  * @param half_pulse_count     number of couples of pulses
  * @param bits                 length of one pulse index in bits
  */
 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);
 
 
 /**

  * weighted sum of two vectors with rounding.

  * @param[out] out result of addition

  * @param in_a first vector
  * @param in_b second vector
  * @param weight_coeff_a first vector weight coefficient
  * @param weight_coeff_a second vector weight coefficient
  * @param rounder this value will be added to the sum of the two vectors
  * @param shift result will be shifted to right by this value
  * @param length vectors length
  *
  * @note It is safe to pass the same buffer for out and in_a or in_b.

  *

  *  out[i] = (in_a[i]*weight_a + in_b[i]*weight_b + rounder) >> shift

  */

 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);

 /**
  * float implementation of weighted sum of two vectors.

  * @param[out] out result of addition

  * @param in_a first vector
  * @param in_b second vector
  * @param weight_coeff_a first vector weight coefficient
  * @param weight_coeff_a second vector weight coefficient
  * @param length vectors length
  *
  * @note It is safe to pass the same buffer for out and in_a or in_b.
  */
 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);

 /**

  * Adaptive gain control (as used in AMR postfiltering)

  *

  * @param out output buffer for filtered speech data
  * @param in the input speech buffer (may be the same as out)

  * @param speech_energ input energy
  * @param size the input buffer size
  * @param alpha exponential filter factor
  * @param gain_mem a pointer to the filter memory (single float of size)
  */

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

                               int size, float alpha, float *gain_mem);

 /**
  * Set the sum of squares of a signal by scaling
  *
  * @param out output samples
  * @param in input samples
  * @param sum_of_squares new sum of squares
  * @param n number of samples
  *
  * @note If the input is zero (or its energy underflows), the output is zero.
  *       This is the behavior of AGC in the AMR reference decoder. The QCELP
  *       reference decoder seems to have undefined behavior.
  *
  * TIA/EIA/IS-733 2.4.8.3-2/3/4/5, 2.4.8.6
  * 3GPP TS 26.090 6.1 (6)
  */
 void ff_scale_vector_to_given_sum_of_squares(float *out, const float *in,
                                              float sum_of_squares, const int n);
 

 /**
  * Add fixed vector to an array from a sparse representation
  *
  * @param out fixed vector with pitch sharpening
  * @param in sparse fixed vector
  * @param scale number to multiply the fixed vector by
  * @param size the output vector size
  */
 void ff_set_fixed_vector(float *out, const AMRFixed *in, float scale, int size);
 
 /**
  * Clear array values set by set_fixed_vector
  *
  * @param out fixed vector to be cleared
  * @param in sparse fixed vector
  * @param size the output vector size
  */
 void ff_clear_fixed_vector(float *out, const AMRFixed *in, int size);
 

 #endif /* AVCODEC_ACELP_VECTORS_H */