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263 lines
9.3 KiB
C
263 lines
9.3 KiB
C
/*
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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 FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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#ifndef AVCODEC_ACELP_VECTORS_H
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#define AVCODEC_ACELP_VECTORS_H
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#include <stdint.h>
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/** Sparse representation for the algebraic codebook (fixed) vector */
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typedef struct {
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int n;
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int x[10];
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float y[10];
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int pitch_lag;
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float pitch_fac;
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} AMRFixed;
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/**
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* Track|Pulse| Positions
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* -------------------------------------------------------------------------
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* 1 | 0 | 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75
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* -------------------------------------------------------------------------
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* 2 | 1 | 1, 6, 11, 16, 21, 26, 31, 36, 41, 46, 51, 56, 61, 66, 71, 76
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* -------------------------------------------------------------------------
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* 3 | 2 | 2, 7, 12, 17, 22, 27, 32, 37, 42, 47, 52, 57, 62, 67, 72, 77
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* -------------------------------------------------------------------------
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*
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* Table contains only first the pulse indexes.
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*
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* Used in G.729 @8k, G.729 @4.4k, AMR @7.95k, AMR @7.40k
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*/
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extern const uint8_t ff_fc_4pulses_8bits_tracks_13[16];
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/**
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* Track|Pulse| Positions
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* -------------------------------------------------------------------------
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* 4 | 3 | 3, 8, 13, 18, 23, 28, 33, 38, 43, 48, 53, 58, 63, 68, 73, 78
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* | | 4, 9, 14, 19, 24, 29, 34, 39, 44, 49, 54, 59, 64, 69, 74, 79
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* -------------------------------------------------------------------------
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*
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* @remark Track in the table should be read top-to-bottom, left-to-right.
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*
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* Used in G.729 @8k, G.729 @4.4k, AMR @7.95k, AMR @7.40k
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*/
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extern const uint8_t ff_fc_4pulses_8bits_track_4[32];
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/**
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* Track|Pulse| Positions
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* -----------------------------------------
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* 1 | 0 | 1, 6, 11, 16, 21, 26, 31, 36
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* | | 3, 8, 13, 18, 23, 28, 33, 38
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* -----------------------------------------
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*
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* @remark Track in the table should be read top-to-bottom, left-to-right.
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*
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* @note (EE) Reference G.729D code also uses gray decoding for each
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* pulse index before looking up the value in the table.
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*
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* Used in G.729 @6.4k (with gray coding), AMR @5.9k (without gray coding)
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*/
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extern const uint8_t ff_fc_2pulses_9bits_track1[16];
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extern const uint8_t ff_fc_2pulses_9bits_track1_gray[16];
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/**
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* Track|Pulse| Positions
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* -----------------------------------------
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* 2 | 1 | 0, 7, 14, 20, 27, 34, 1, 21
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* | | 2, 9, 15, 22, 29, 35, 6, 26
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* | | 4,10, 17, 24, 30, 37, 11, 31
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* | | 5,12, 19, 25, 32, 39, 16, 36
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* -----------------------------------------
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*
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* @remark Track in the table should be read top-to-bottom, left-to-right.
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*
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* @note (EE.1) This table (from the reference code) does not comply with
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* the specification.
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* The specification contains the following table:
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*
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* Track|Pulse| Positions
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* -----------------------------------------
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* 2 | 1 | 0, 5, 10, 15, 20, 25, 30, 35
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* | | 1, 6, 11, 16, 21, 26, 31, 36
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* | | 2, 7, 12, 17, 22, 27, 32, 37
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* | | 4, 9, 14, 19, 24, 29, 34, 39
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*
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* -----------------------------------------
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*
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* @note (EE.2) Reference G.729D code also uses gray decoding for each
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* pulse index before looking up the value in the table.
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*
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* Used in G.729 @6.4k (with gray coding)
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*/
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extern const uint8_t ff_fc_2pulses_9bits_track2_gray[32];
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/**
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* b60 hamming windowed sinc function coefficients
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*/
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extern const float ff_b60_sinc[61];
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/**
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* Table of pow(0.7,n)
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*/
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extern const float ff_pow_0_7[10];
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/**
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* Table of pow(0.75,n)
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*/
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extern const float ff_pow_0_75[10];
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/**
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* Table of pow(0.55,n)
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*/
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extern const float ff_pow_0_55[10];
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/**
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* Decode fixed-codebook vector (3.8 and D.5.8 of G.729, 5.7.1 of AMR).
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* @param fc_v [out] decoded fixed codebook vector (2.13)
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* @param tab1 table used for first pulse_count pulses
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* @param tab2 table used for last pulse
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* @param pulse_indexes fixed codebook indexes
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* @param pulse_signs signs of the excitation pulses (0 bit value
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* means negative sign)
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* @param bits number of bits per one pulse index
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* @param pulse_count number of pulses decoded using first table
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* @param bits length of one pulse index in bits
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*
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* Used in G.729 @8k, G.729 @4.4k, G.729 @6.4k, AMR @7.95k, AMR @7.40k
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*/
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void ff_acelp_fc_pulse_per_track(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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* Decode the algebraic codebook index to pulse positions and signs and
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* construct the algebraic codebook vector for MODE_12k2.
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*
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* @note: The positions and signs are explicitly coded in MODE_12k2.
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*
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* @param fixed_index positions of the ten pulses
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* @param fixed_sparse pointer to the algebraic codebook vector
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* @param gray_decode gray decoding table
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* @param half_pulse_count number of couples of pulses
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* @param bits length of one pulse index in bits
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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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* weighted sum of two vectors with rounding.
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* @param out [out] result of addition
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* @param in_a first vector
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* @param in_b second vector
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* @param weight_coeff_a first vector weight coefficient
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* @param weight_coeff_a second vector weight coefficient
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* @param rounder this value will be added to the sum of the two vectors
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* @param shift result will be shifted to right by this value
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* @param length vectors length
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*
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* @note It is safe to pass the same buffer for out and in_a or in_b.
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*
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* out[i] = (in_a[i]*weight_a + in_b[i]*weight_b + rounder) >> shift
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*/
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void ff_acelp_weighted_vector_sum(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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* float implementation of weighted sum of two vectors.
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* @param out [out] result of addition
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* @param in_a first vector
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* @param in_b second vector
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* @param weight_coeff_a first vector weight coefficient
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* @param weight_coeff_a second vector weight coefficient
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* @param length vectors length
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*
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* @note It is safe to pass the same buffer for out and in_a or in_b.
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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,
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int length);
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/**
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* Adaptative gain control (as used in AMR postfiltering)
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*
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* @param buf_out the input speech buffer
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* @param speech_energ input energy
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* @param size the input buffer size
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* @param alpha exponential filter factor
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* @param gain_mem a pointer to the filter memory (single float of size)
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*/
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void ff_adaptative_gain_control(float *buf_out, float speech_energ,
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int size, float alpha, float *gain_mem);
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/**
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* Set the sum of squares of a signal by scaling
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*
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* @param out output samples
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* @param in input samples
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* @param sum_of_squares new sum of squares
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* @param n number of samples
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*
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* @note If the input is zero (or its energy underflows), the output is zero.
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* This is the behavior of AGC in the AMR reference decoder. The QCELP
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* reference decoder seems to have undefined behavior.
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*
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* TIA/EIA/IS-733 2.4.8.3-2/3/4/5, 2.4.8.6
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* 3GPP TS 26.090 6.1 (6)
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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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* Add fixed vector to an array from a sparse representation
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*
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* @param out fixed vector with pitch sharpening
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* @param in sparse fixed vector
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* @param scale number to multiply the fixed vector by
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* @param size the output vector size
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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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* Clear array values set by set_fixed_vector
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*
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* @param out fixed vector to be cleared
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* @param in sparse fixed vector
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* @param size the output vector size
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*/
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void ff_clear_fixed_vector(float *out, const AMRFixed *in, int size);
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#endif /* AVCODEC_ACELP_VECTORS_H */
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