From 8992cb1d0d07edc33d274f6d7924ecdf6f83d994 Mon Sep 17 00:00:00 2001 From: Tim Redfern Date: Thu, 5 Sep 2013 17:57:22 +0100 Subject: making act segmenter --- ffmpeg/libavcodec/celp_math.c | 126 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 126 insertions(+) create mode 100644 ffmpeg/libavcodec/celp_math.c (limited to 'ffmpeg/libavcodec/celp_math.c') diff --git a/ffmpeg/libavcodec/celp_math.c b/ffmpeg/libavcodec/celp_math.c new file mode 100644 index 0000000..a96b1ae --- /dev/null +++ b/ffmpeg/libavcodec/celp_math.c @@ -0,0 +1,126 @@ +/* + * 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 + */ + +#include +#include + +#include "libavutil/avassert.h" +#include "avcodec.h" +#include "mathops.h" +#include "celp_math.h" +#include "libavutil/common.h" + +static const uint16_t exp2a[]= +{ + 0, 1435, 2901, 4400, 5931, 7496, 9096, 10730, + 12400, 14106, 15850, 17632, 19454, 21315, 23216, 25160, + 27146, 29175, 31249, 33368, 35534, 37747, 40009, 42320, + 44682, 47095, 49562, 52082, 54657, 57289, 59979, 62727, +}; + +static const uint16_t exp2b[]= +{ + 3, 712, 1424, 2134, 2845, 3557, 4270, 4982, + 5696, 6409, 7124, 7839, 8554, 9270, 9986, 10704, + 11421, 12138, 12857, 13576, 14295, 15014, 15734, 16455, + 17176, 17898, 18620, 19343, 20066, 20790, 21514, 22238, +}; + +int ff_exp2(uint16_t power) +{ + unsigned int result= exp2a[power>>10] + 0x10000; + + av_assert2(power <= 0x7fff); + + result= (result<<3) + ((result*exp2b[(power>>5)&31])>>17); + return result + ((result*(power&31)*89)>>22); +} + +/** + * Table used to compute log2(x) + * + * tab_log2[i] = (1<<15) * log2(1 + i/32), i=0..32 + */ +static const uint16_t tab_log2[33] = +{ +#ifdef G729_BITEXACT + 0, 1455, 2866, 4236, 5568, 6863, 8124, 9352, + 10549, 11716, 12855, 13967, 15054, 16117, 17156, 18172, + 19167, 20142, 21097, 22033, 22951, 23852, 24735, 25603, + 26455, 27291, 28113, 28922, 29716, 30497, 31266, 32023, 32767, +#else + 4, 1459, 2870, 4240, 5572, 6867, 8127, 9355, + 10552, 11719, 12858, 13971, 15057, 16120, 17158, 18175, + 19170, 20145, 21100, 22036, 22954, 23854, 24738, 25605, + 26457, 27294, 28116, 28924, 29719, 30500, 31269, 32025, 32769, +#endif +}; + +int ff_log2_q15(uint32_t value) +{ + uint8_t power_int; + uint8_t frac_x0; + uint16_t frac_dx; + + // Stripping zeros from beginning + power_int = av_log2(value); + value <<= (31 - power_int); + + // b31 is always non-zero now + frac_x0 = (value & 0x7c000000) >> 26; // b26-b31 and [32..63] -> [0..31] + frac_dx = (value & 0x03fff800) >> 11; + + value = tab_log2[frac_x0]; + value += (frac_dx * (tab_log2[frac_x0+1] - tab_log2[frac_x0])) >> 15; + + return (power_int << 15) + value; +} + +int64_t ff_dot_product(const int16_t *a, const int16_t *b, int length) +{ + int i; + int64_t sum = 0; + + for (i = 0; i < length; i++) + sum += MUL16(a[i], b[i]); + + return sum; +} + +float ff_dot_productf(const float* a, const float* b, int length) +{ + float sum = 0; + int i; + + for(i=0; idot_productf = ff_dot_productf; + + if(HAVE_MIPSFPU) + ff_celp_math_init_mips(c); +} -- cgit v1.2.3