Line | Branch | Exec | Source |
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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 | |||
27 | #define FILT_ORDER 4 | ||
28 | #define SIZE 1024 | ||
29 | |||
30 | 1 | int main(void) | |
31 | { | ||
32 | 1 | struct FFIIRFilterCoeffs *fcoeffs = NULL; | |
33 | 1 | struct FFIIRFilterState *fstate = NULL; | |
34 | 1 | float cutoff_coeff = 0.4; | |
35 | int16_t x[SIZE], y[SIZE]; | ||
36 | int i; | ||
37 | |||
38 | 1 | fcoeffs = ff_iir_filter_init_coeffs(NULL, FF_FILTER_TYPE_BUTTERWORTH, | |
39 | FF_FILTER_MODE_LOWPASS, FILT_ORDER, | ||
40 | cutoff_coeff, 0.0, 0.0); | ||
41 | 1 | fstate = ff_iir_filter_init_state(FILT_ORDER); | |
42 | |||
43 |
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1025 | for (i = 0; i < SIZE; i++) |
44 | 1024 | x[i] = lrint(0.75 * INT16_MAX * sin(0.5 * M_PI * i * i / SIZE)); | |
45 | |||
46 | 1 | ff_iir_filter(fcoeffs, fstate, SIZE, x, 1, y, 1); | |
47 | |||
48 |
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1025 | for (i = 0; i < SIZE; i++) |
49 | 1024 | printf("%6d %6d\n", x[i], y[i]); | |
50 | |||
51 | 1 | ff_iir_filter_free_coeffsp(&fcoeffs); | |
52 | 1 | ff_iir_filter_free_statep(&fstate); | |
53 | 1 | return 0; | |
54 | } | ||
55 |