FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/celp_math.h
Date: 2021-09-16 08:47:15
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1 /*
2 * Various fixed-point math operations
3 *
4 * Copyright (c) 2008 Vladimir Voroshilov
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 #ifndef AVCODEC_CELP_MATH_H
24 #define AVCODEC_CELP_MATH_H
25
26 #include <stdint.h>
27
28 typedef struct CELPMContext {
29 /**
30 * Return the dot product.
31 * @param a input data array
32 * @param b input data array
33 * @param length number of elements
34 *
35 * @return dot product = sum of elementwise products
36 */
37 float (*dot_productf)(const float* a, const float* b, int length);
38
39 }CELPMContext;
40
41 /**
42 * Initialize CELPMContext.
43 */
44 void ff_celp_math_init(CELPMContext *c);
45 void ff_celp_math_init_mips(CELPMContext *c);
46
47 /**
48 * fixed-point implementation of exp2(x) in [0; 1] domain.
49 * @param power argument to exp2, 0 <= power <= 0x7fff
50 *
51 * @return value of (1<<20) * exp2(power / (1<<15))
52 * 0x8000c <= result <= 0xfffea
53 */
54 int ff_exp2(uint16_t power);
55
56 /**
57 * Calculate log2(x).
58 * @param value function argument, 0 < value <= 7fff ffff
59 *
60 * @return value of (1<<15) * log2(value)
61 */
62 int ff_log2_q15(uint32_t value);
63
64 /**
65 * Calculate the dot product of 2 int16_t vectors.
66 * @param a input data array
67 * @param b input data array
68 * @param length number of elements
69 *
70 * @return dot product = sum of elementwise products
71 */
72 int64_t ff_dot_product(const int16_t *a, const int16_t *b, int length);
73
74 /**
75 * Shift value left or right depending on sign of offset parameter.
76 * @param value value to shift
77 * @param offset shift offset
78 *
79 * @return value << offset, if offset>=0; value >> -offset - otherwise
80 */
81 static inline int bidir_sal(int value, int offset)
82 {
83 if(offset < 0) return value >> -offset;
84 else return value << offset;
85 }
86
87 /**
88 * Return the dot product.
89 * @param a input data array
90 * @param b input data array
91 * @param length number of elements
92 *
93 * @return dot product = sum of elementwise products
94 */
95 float ff_dot_productf(const float* a, const float* b, int length);
96
97 #endif /* AVCODEC_CELP_MATH_H */
98