0,0 → 1,97 |
/* |
* 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); |
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}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); |
|
/** |
* 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; |
} |
|
/** |
* returns 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); |
|
/** |
* 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); |
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#endif /* AVCODEC_CELP_MATH_H */ |