GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/celp_math.c Lines: 21 25 84.0 %
Date: 2019-11-22 03:34:36 Branches: 4 4 100.0 %

Line Branch Exec Source
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/*
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 * Various fixed-point math operations
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 *
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 * Copyright (c) 2008 Vladimir Voroshilov
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include <inttypes.h>
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#include <limits.h>
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#include "libavutil/avassert.h"
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#include "avcodec.h"
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#include "mathops.h"
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#include "celp_math.h"
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#include "libavutil/common.h"
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static const uint16_t exp2a[]=
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{
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     0,  1435,  2901,  4400,  5931,  7496,  9096, 10730,
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 12400, 14106, 15850, 17632, 19454, 21315, 23216, 25160,
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 27146, 29175, 31249, 33368, 35534, 37747, 40009, 42320,
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 44682, 47095, 49562, 52082, 54657, 57289, 59979, 62727,
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};
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static const uint16_t exp2b[]=
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{
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     3,   712,  1424,  2134,  2845,  3557,  4270,  4982,
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  5696,  6409,  7124,  7839,  8554,  9270,  9986, 10704,
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 11421, 12138, 12857, 13576, 14295, 15014, 15734, 16455,
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 17176, 17898, 18620, 19343, 20066, 20790, 21514, 22238,
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};
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int ff_exp2(uint16_t power)
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{
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    unsigned int result= exp2a[power>>10] + 0x10000;
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    av_assert2(power <= 0x7fff);
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    result= (result<<3) + ((result*exp2b[(power>>5)&31])>>17);
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    return result + ((result*(power&31)*89)>>22);
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}
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/**
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 * Table used to compute log2(x)
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 *
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 * tab_log2[i] = (1<<15) * log2(1 + i/32), i=0..32
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 */
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static const uint16_t tab_log2[33] =
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{
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#ifdef G729_BITEXACT
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      0,   1455,   2866,   4236,   5568,   6863,   8124,   9352,
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  10549,  11716,  12855,  13967,  15054,  16117,  17156,  18172,
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  19167,  20142,  21097,  22033,  22951,  23852,  24735,  25603,
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  26455,  27291,  28113,  28922,  29716,  30497,  31266,  32023,  32767,
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#else
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      4,   1459,   2870,   4240,   5572,   6867,   8127,   9355,
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  10552,  11719,  12858,  13971,  15057,  16120,  17158,  18175,
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  19170,  20145,  21100,  22036,  22954,  23854,  24738,  25605,
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  26457,  27294,  28116,  28924,  29719,  30500,  31269,  32025,  32769,
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#endif
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};
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int ff_log2_q15(uint32_t value)
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{
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    uint8_t  power_int;
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    uint8_t  frac_x0;
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    uint16_t frac_dx;
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    // Stripping zeros from beginning
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    power_int = av_log2(value);
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    value <<= (31 - power_int);
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    // b31 is always non-zero now
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    frac_x0 = (value & 0x7c000000) >> 26; // b26-b31 and [32..63] -> [0..31]
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    frac_dx = (value & 0x03fff800) >> 11;
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    value = tab_log2[frac_x0];
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    value += (frac_dx * (tab_log2[frac_x0+1] - tab_log2[frac_x0])) >> 15;
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    return (power_int << 15) + value;
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}
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905983
int64_t ff_dot_product(const int16_t *a, const int16_t *b, int length)
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{
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    int i;
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905983
    int64_t sum = 0;
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    for (i = 0; i < length; i++)
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        sum += MUL16(a[i], b[i]);
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    return sum;
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}
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1778086
float ff_dot_productf(const float* a, const float* b, int length)
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{
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1778086
    float sum = 0;
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    int i;
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    for(i=0; i<length; i++)
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48362091
        sum += a[i] * b[i];
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1778086
    return sum;
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}
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void ff_celp_math_init(CELPMContext *c)
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{
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    c->dot_productf   = ff_dot_productf;
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    if(HAVE_MIPSFPU)
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        ff_celp_math_init_mips(c);
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}