yading@10: /*
yading@10:  * Various fixed-point math operations
yading@10:  *
yading@10:  * Copyright (c) 2008 Vladimir Voroshilov
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #ifndef AVCODEC_CELP_MATH_H
yading@10: #define AVCODEC_CELP_MATH_H
yading@10: 
yading@10: #include <stdint.h>
yading@10: 
yading@10: typedef struct CELPMContext {
yading@10:     /**
yading@10:      * Return the dot product.
yading@10:      * @param a input data array
yading@10:      * @param b input data array
yading@10:      * @param length number of elements
yading@10:      *
yading@10:      * @return dot product = sum of elementwise products
yading@10:      */
yading@10:     float (*dot_productf)(const float* a, const float* b, int length);
yading@10: 
yading@10: }CELPMContext;
yading@10: 
yading@10: /**
yading@10:  * Initialize CELPMContext.
yading@10:  */
yading@10: void ff_celp_math_init(CELPMContext *c);
yading@10: void ff_celp_math_init_mips(CELPMContext *c);
yading@10: 
yading@10: /**
yading@10:  * fixed-point implementation of exp2(x) in [0; 1] domain.
yading@10:  * @param power argument to exp2, 0 <= power <= 0x7fff
yading@10:  *
yading@10:  * @return value of (1<<20) * exp2(power / (1<<15))
yading@10:  *         0x8000c <= result <= 0xfffea
yading@10:  */
yading@10: int ff_exp2(uint16_t power);
yading@10: 
yading@10: /**
yading@10:  * Calculate log2(x).
yading@10:  * @param value function argument, 0 < value <= 7fff ffff
yading@10:  *
yading@10:  * @return value of (1<<15) * log2(value)
yading@10:  */
yading@10: int ff_log2_q15(uint32_t value);
yading@10: 
yading@10: /**
yading@10:  * Shift value left or right depending on sign of offset parameter.
yading@10:  * @param value value to shift
yading@10:  * @param offset shift offset
yading@10:  *
yading@10:  * @return value << offset, if offset>=0; value >> -offset - otherwise
yading@10:  */
yading@10: static inline int bidir_sal(int value, int offset)
yading@10: {
yading@10:     if(offset < 0) return value >> -offset;
yading@10:     else           return value <<  offset;
yading@10: }
yading@10: 
yading@10: /**
yading@10:  * returns the dot product of 2 int16_t vectors.
yading@10:  * @param a input data array
yading@10:  * @param b input data array
yading@10:  * @param length number of elements
yading@10:  *
yading@10:  * @return dot product = sum of elementwise products
yading@10:  */
yading@10: int64_t ff_dot_product(const int16_t *a, const int16_t *b, int length);
yading@10: 
yading@10: /**
yading@10:  * Return the dot product.
yading@10:  * @param a input data array
yading@10:  * @param b input data array
yading@10:  * @param length number of elements
yading@10:  *
yading@10:  * @return dot product = sum of elementwise products
yading@10:  */
yading@10: float ff_dot_productf(const float* a, const float* b, int length);
yading@10: 
yading@10: #endif /* AVCODEC_CELP_MATH_H */