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libavcodec/celp_math.h

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00001 /*
00002  * Various fixed-point math operations
00003  *
00004  * Copyright (c) 2008 Vladimir Voroshilov
00005  *
00006  * This file is part of FFmpeg.
00007  *
00008  * FFmpeg is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * FFmpeg is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with FFmpeg; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00023 #ifndef AVCODEC_CELP_MATH_H
00024 #define AVCODEC_CELP_MATH_H
00025 
00026 #include <stdint.h>
00027 
00034 int16_t ff_cos(uint16_t arg);
00035 
00043 int ff_exp2(uint16_t power);
00044 
00051 int ff_log2(uint32_t value);
00052 
00060 static inline int bidir_sal(int value, int offset)
00061 {
00062     if(offset < 0) return value >> -offset;
00063     else           return value <<  offset;
00064 }
00065 
00074 float ff_dot_productf(const float* a, const float* b, int length);
00075 
00076 #endif /* AVCODEC_CELP_MATH_H */

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