aboutsummaryrefslogtreecommitdiffstats
path: root/libavcodec/acelp_vectors.h
blob: 3a47a7b61cce1dda5c88d8c8ebc24b23ece0a508 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
/*
 * 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>

/**
 * 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];

/**
 * Decode fixed-codebook vector (3.8 and D.5.8 of G.729, 5.7.1 of AMR).
 * @param fc_v [out] 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);

/**
 * 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);

#endif /* AVCODEC_ACELP_VECTORS_H */