| /* |
| * Various fixed-point math operations |
| * |
| * 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_CELP_MATH_H |
| #define AVCODEC_CELP_MATH_H |
| |
| #include <stdint.h> |
| |
| typedef struct CELPMContext { |
| /** |
| * Return the dot product. |
| * @param a input data array |
| * @param b input data array |
| * @param length number of elements |
| * |
| * @return dot product = sum of elementwise products |
| */ |
| float (*dot_productf)(const float* a, const float* b, int length); |
| |
| }CELPMContext; |
| |
| /** |
| * Initialize CELPMContext. |
| */ |
| void ff_celp_math_init(CELPMContext *c); |
| void ff_celp_math_init_mips(CELPMContext *c); |
| |
| /** |
| * fixed-point implementation of exp2(x) in [0; 1] domain. |
| * @param power argument to exp2, 0 <= power <= 0x7fff |
| * |
| * @return value of (1<<20) * exp2(power / (1<<15)) |
| * 0x8000c <= result <= 0xfffea |
| */ |
| int ff_exp2(uint16_t power); |
| |
| /** |
| * Calculate log2(x). |
| * @param value function argument, 0 < value <= 7fff ffff |
| * |
| * @return value of (1<<15) * log2(value) |
| */ |
| int ff_log2_q15(uint32_t value); |
| |
| /** |
| * Calculate the dot product of 2 int16_t vectors. |
| * @param a input data array |
| * @param b input data array |
| * @param length number of elements |
| * |
| * @return dot product = sum of elementwise products |
| */ |
| int64_t ff_dot_product(const int16_t *a, const int16_t *b, int length); |
| |
| /** |
| * Shift value left or right depending on sign of offset parameter. |
| * @param value value to shift |
| * @param offset shift offset |
| * |
| * @return value << offset, if offset>=0; value >> -offset - otherwise |
| */ |
| static inline int bidir_sal(int value, int offset) |
| { |
| if(offset < 0) return value >> -offset; |
| else return value << offset; |
| } |
| |
| /** |
| * Return the dot product. |
| * @param a input data array |
| * @param b input data array |
| * @param length number of elements |
| * |
| * @return dot product = sum of elementwise products |
| */ |
| float ff_dot_productf(const float* a, const float* b, int length); |
| |
| #endif /* AVCODEC_CELP_MATH_H */ |