FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/tests/iirfilter.c
Date: 2024-07-24 19:24:46
Exec Total Coverage
Lines: 19 21 90.5%
Functions: 2 2 100.0%
Branches: 8 20 40.0%

Line Branch Exec Source
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 <math.h>
20 #include <stdint.h>
21 #include <stdio.h>
22
23 #include "libavutil/libm.h"
24
25 #include "libavcodec/iirfilter.h"
26 #include "libavcodec/iirfilter.c"
27
28 #define FILT_ORDER 4
29 #define SIZE 1024
30
31 1 static void iir_filter_int16(const struct FFIIRFilterCoeffs *c,
32 struct FFIIRFilterState *s, int size,
33 const int16_t *src, ptrdiff_t sstep,
34 int16_t *dst, ptrdiff_t dstep)
35 {
36
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1 if (c->order == 2) {
37 FILTER_O2(int16_t, S16)
38
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1 } else if (c->order == 4) {
39
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257 FILTER_BW_O4(int16_t, S16)
40 } else {
41 FILTER_DIRECT_FORM_II(int16_t, S16)
42 }
43 1 }
44
45 1 int main(void)
46 {
47 1 struct FFIIRFilterCoeffs *fcoeffs = NULL;
48 1 struct FFIIRFilterState *fstate = NULL;
49 1 float cutoff_coeff = 0.4;
50 int16_t x[SIZE], y[SIZE];
51 int i;
52
53 1 fcoeffs = ff_iir_filter_init_coeffs(NULL, FF_FILTER_TYPE_BUTTERWORTH,
54 FF_FILTER_MODE_LOWPASS, FILT_ORDER,
55 cutoff_coeff, 0.0, 0.0);
56 1 fstate = ff_iir_filter_init_state(FILT_ORDER);
57
58
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1025 for (i = 0; i < SIZE; i++)
59 1024 x[i] = lrint(0.75 * INT16_MAX * sin(0.5 * M_PI * i * i / SIZE));
60
61 1 iir_filter_int16(fcoeffs, fstate, SIZE, x, 1, y, 1);
62
63
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1025 for (i = 0; i < SIZE; i++)
64 1024 printf("%6d %6d\n", x[i], y[i]);
65
66 1 ff_iir_filter_free_coeffsp(&fcoeffs);
67 1 ff_iir_filter_free_statep(&fstate);
68 1 return 0;
69 }
70