FFmpeg  1.2.12
celp_math.h
Go to the documentation of this file.
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 {
37  float (*dot_productf)(const float* a, const float* b, int length);
38 
40 
46 
54 int ff_exp2(uint16_t power);
55 
62 int ff_log2_q15(uint32_t value);
63 
71 static inline int bidir_sal(int value, int offset)
72 {
73  if(offset < 0) return value >> -offset;
74  else return value << offset;
75 }
76 
85 int64_t ff_dot_product(const int16_t *a, const int16_t *b, int length);
86 
95 float ff_dot_productf(const float* a, const float* b, int length);
96 
97 #endif /* AVCODEC_CELP_MATH_H */