| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 unsigned bidir_sal(unsigned 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 |