FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
celp_math.c
Go to the documentation of this file.
1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include "libavutil/libm.h"
20 #include "libavcodec/celp_math.c"
21 
22 static inline void IsAlmostEqual(float A, float B, float epsilon)
23 {
24  float diff = fabsf(A - B);
25  float absa = fabsf(A);
26  float absb = fabsf(B);
27  float largest = (absb > absa) ? absb : absa;
28  av_assert0(diff <= largest * epsilon);
29 }
30 
31 int main(void)
32 {
33  int i;
34  const float f1[3] = {0.0, 1.1, 2.2};
35  const float f2[3] = {3.3, 4.4, 5.5};
36  const int16_t i1[3] = {6, 7, 8};
37  const int16_t i2[3] = {9, 10, 11};
38 
39  float r = ff_dot_productf(f1, f2, FF_ARRAY_ELEMS(f1));
40  int64_t d = ff_dot_product(i1, i2, FF_ARRAY_ELEMS(i1));
41 
42  IsAlmostEqual(16.94f, r, 0.000001f);
43  av_assert0(212 == d);
44 
45  for (i = 1024; i >= 1; i/=2)
46  av_assert0(ff_log2_q15(i) == (1<<15)*((int)log2(i))+(1<<2));
47 
48  return 0;
49 }
float ff_dot_productf(const float *a, const float *b, int length)
Return the dot product.
Definition: celp_math.c:109
#define log2(x)
Definition: libm.h:404
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
#define f(width, name)
Definition: cbs_vp9.c:255
#define A(x)
Definition: vp56_arith.h:28
#define B
Definition: huffyuvdsp.h:32
const char * r
Definition: vf_curves.c:111
int64_t ff_dot_product(const int16_t *a, const int16_t *b, int length)
Calculate the dot product of 2 int16_t vectors.
Definition: celp_math.c:98
int ff_log2_q15(uint32_t value)
Calculate log2(x).
Definition: celp_math.c:78
#define FF_ARRAY_ELEMS(a)
Replacements for frequently missing libm functions.
static void IsAlmostEqual(float A, float B, float epsilon)
Definition: celp_math.c:22
static av_always_inline int diff(const uint32_t a, const uint32_t b)
int main(void)
Definition: celp_math.c:31