| 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 |
1/2✗ Branch 0 not taken.
✓ Branch 1 taken 1 times.
|
1 | if (c->order == 2) { |
| 37 | ✗ | FILTER_O2(int16_t, S16) | |
| 38 |
1/2✓ Branch 0 taken 1 times.
✗ Branch 1 not taken.
|
1 | } else if (c->order == 4) { |
| 39 |
2/2✓ Branch 0 taken 256 times.
✓ Branch 1 taken 1 times.
|
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 |
2/2✓ Branch 0 taken 1024 times.
✓ Branch 1 taken 1 times.
|
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 |
2/2✓ Branch 0 taken 1024 times.
✓ Branch 1 taken 1 times.
|
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 |