FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavfilter/window_func.h
Date: 2026-04-20 11:33:30
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Functions: 0 1 0.0%
Branches: 0 106 0.0%
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1 /*
2 * Copyright (c) 2015 Paul B Mahol
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21
22 #ifndef AVFILTER_WINDOW_FUNC_H
23 #define AVFILTER_WINDOW_FUNC_H
24
25 #include <math.h>
26 #include "libavutil/avassert.h"
27 #include "libavutil/common.h"
28
29 enum WindowFunc { WFUNC_RECT, WFUNC_HANNING, WFUNC_HAMMING, WFUNC_BLACKMAN,
30 WFUNC_BARTLETT, WFUNC_WELCH, WFUNC_FLATTOP,
31 WFUNC_BHARRIS, WFUNC_BNUTTALL, WFUNC_SINE, WFUNC_NUTTALL,
32 WFUNC_BHANN, WFUNC_LANCZOS, WFUNC_GAUSS, WFUNC_TUKEY,
33 WFUNC_DOLPH, WFUNC_CAUCHY, WFUNC_PARZEN, WFUNC_POISSON,
34 WFUNC_BOHMAN, WFUNC_KAISER,
35 NB_WFUNC };
36
37 #define WIN_FUNC_OPTION(win_func_opt_name, win_func_offset, flag, default_window_func) \
38 { win_func_opt_name, "set window function", win_func_offset, AV_OPT_TYPE_INT, {.i64 = default_window_func}, 0, NB_WFUNC-1, flag, .unit = "win_func" }, \
39 { "rect", "Rectangular", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_RECT}, 0, 0, flag, .unit = "win_func" }, \
40 { "bartlett", "Bartlett", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BARTLETT}, 0, 0, flag, .unit = "win_func" }, \
41 { "hann", "Hann", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING}, 0, 0, flag, .unit = "win_func" }, \
42 { "hanning", "Hanning", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING}, 0, 0, flag, .unit = "win_func" }, \
43 { "hamming", "Hamming", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HAMMING}, 0, 0, flag, .unit = "win_func" }, \
44 { "blackman", "Blackman", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BLACKMAN}, 0, 0, flag, .unit = "win_func" }, \
45 { "welch", "Welch", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_WELCH}, 0, 0, flag, .unit = "win_func" }, \
46 { "flattop", "Flat-top", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_FLATTOP}, 0, 0, flag, .unit = "win_func" }, \
47 { "bharris", "Blackman-Harris", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHARRIS}, 0, 0, flag, .unit = "win_func" }, \
48 { "bnuttall", "Blackman-Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BNUTTALL}, 0, 0, flag, .unit = "win_func" }, \
49 { "bhann", "Bartlett-Hann", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHANN}, 0, 0, flag, .unit = "win_func" }, \
50 { "sine", "Sine", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_SINE}, 0, 0, flag, .unit = "win_func" }, \
51 { "nuttall", "Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_NUTTALL}, 0, 0, flag, .unit = "win_func" }, \
52 { "lanczos", "Lanczos", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_LANCZOS}, 0, 0, flag, .unit = "win_func" }, \
53 { "gauss", "Gauss", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_GAUSS}, 0, 0, flag, .unit = "win_func" }, \
54 { "tukey", "Tukey", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_TUKEY}, 0, 0, flag, .unit = "win_func" }, \
55 { "dolph", "Dolph-Chebyshev", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_DOLPH}, 0, 0, flag, .unit = "win_func" }, \
56 { "cauchy", "Cauchy", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_CAUCHY}, 0, 0, flag, .unit = "win_func" }, \
57 { "parzen", "Parzen", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_PARZEN}, 0, 0, flag, .unit = "win_func" }, \
58 { "poisson", "Poisson", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_POISSON}, 0, 0, flag, .unit = "win_func" }, \
59 { "bohman", "Bohman", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BOHMAN}, 0, 0, flag, .unit = "win_func" }, \
60 { "kaiser", "Kaiser", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_KAISER}, 0, 0, flag, .unit = "win_func" }
61
62
63 ✗ static inline void generate_window_func(float *lut, int N, int win_func,
64 float *overlap)
65 {
66 int n;
67
68 ✗ switch (win_func) {
69 ✗ case WFUNC_RECT:
70 ✗ for (n = 0; n < N; n++)
71 ✗ lut[n] = 1.;
72 ✗ *overlap = 0.;
73 ✗ break;
74 ✗ case WFUNC_BARTLETT:
75 ✗ for (n = 0; n < N; n++)
76 ✗ lut[n] = 1.-fabs((n-(N-1)/2.)/((N-1)/2.));
77 ✗ *overlap = 0.5;
78 ✗ break;
79 ✗ case WFUNC_HANNING:
80 ✗ for (n = 0; n < N; n++)
81 ✗ lut[n] = .5*(1-cos(2*M_PI*n/(N-1)));
82 ✗ *overlap = 0.5;
83 ✗ break;
84 ✗ case WFUNC_HAMMING:
85 ✗ for (n = 0; n < N; n++)
86 ✗ lut[n] = .54-.46*cos(2*M_PI*n/(N-1));
87 ✗ *overlap = 0.5;
88 ✗ break;
89 ✗ case WFUNC_BLACKMAN:
90 ✗ for (n = 0; n < N; n++)
91 ✗ lut[n] = .42659-.49656*cos(2*M_PI*n/(N-1))+.076849*cos(4*M_PI*n/(N-1));
92 ✗ *overlap = 0.661;
93 ✗ break;
94 ✗ case WFUNC_WELCH:
95 ✗ for (n = 0; n < N; n++)
96 ✗ lut[n] = 1.-(n-(N-1)/2.)/((N-1)/2.)*(n-(N-1)/2.)/((N-1)/2.);
97 ✗ *overlap = 0.293;
98 ✗ break;
99 ✗ case WFUNC_FLATTOP:
100 ✗ for (n = 0; n < N; n++)
101 ✗ lut[n] = 1.-1.985844164102*cos( 2*M_PI*n/(N-1))+1.791176438506*cos( 4*M_PI*n/(N-1))-
102 ✗ 1.282075284005*cos( 6*M_PI*n/(N-1))+0.667777530266*cos( 8*M_PI*n/(N-1))-
103 ✗ 0.240160796576*cos(10*M_PI*n/(N-1))+0.056656381764*cos(12*M_PI*n/(N-1))-
104 ✗ 0.008134974479*cos(14*M_PI*n/(N-1))+0.000624544650*cos(16*M_PI*n/(N-1))-
105 ✗ 0.000019808998*cos(18*M_PI*n/(N-1))+0.000000132974*cos(20*M_PI*n/(N-1));
106 ✗ *overlap = 0.841;
107 ✗ break;
108 ✗ case WFUNC_BHARRIS:
109 ✗ for (n = 0; n < N; n++)
110 ✗ lut[n] = 0.35875-0.48829*cos(2*M_PI*n/(N-1))+0.14128*cos(4*M_PI*n/(N-1))-0.01168*cos(6*M_PI*n/(N-1));
111 ✗ *overlap = 0.661;
112 ✗ break;
113 ✗ case WFUNC_BNUTTALL:
114 ✗ for (n = 0; n < N; n++)
115 ✗ lut[n] = 0.3635819-0.4891775*cos(2*M_PI*n/(N-1))+0.1365995*cos(4*M_PI*n/(N-1))-0.0106411*cos(6*M_PI*n/(N-1));
116 ✗ *overlap = 0.661;
117 ✗ break;
118 ✗ case WFUNC_BHANN:
119 ✗ for (n = 0; n < N; n++)
120 ✗ lut[n] = 0.62-0.48*fabs(n/(double)(N-1)-.5)-0.38*cos(2*M_PI*n/(N-1));
121 ✗ *overlap = 0.5;
122 ✗ break;
123 ✗ case WFUNC_SINE:
124 ✗ for (n = 0; n < N; n++)
125 ✗ lut[n] = sin(M_PI*n/(N-1));
126 ✗ *overlap = 0.75;
127 ✗ break;
128 ✗ case WFUNC_NUTTALL:
129 ✗ for (n = 0; n < N; n++)
130 ✗ lut[n] = 0.355768-0.487396*cos(2*M_PI*n/(N-1))+0.144232*cos(4*M_PI*n/(N-1))-0.012604*cos(6*M_PI*n/(N-1));
131 ✗ *overlap = 0.663;
132 ✗ break;
133 ✗ case WFUNC_LANCZOS:
134 #define SINC(x) (!(x)) ? 1 : sin(M_PI * (x))/(M_PI * (x));
135 ✗ for (n = 0; n < N; n++)
136 ✗ lut[n] = SINC((2.*n)/(N-1)-1);
137 ✗ *overlap = 0.75;
138 ✗ break;
139 ✗ case WFUNC_GAUSS:
140 #define SQR(x) ((x)*(x))
141 ✗ for (n = 0; n < N; n++)
142 ✗ lut[n] = exp(-0.5 * SQR((n-(N-1)/2)/(0.4*(N-1)/2.f)));
143 ✗ *overlap = 0.75;
144 ✗ break;
145 ✗ case WFUNC_TUKEY:
146 ✗ for (n = 0; n < N; n++) {
147 ✗ float M = (N-1)/2.;
148
149 ✗ if (FFABS(n - M) >= 0.3 * M) {
150 ✗ lut[n] = 0.5 * (1 + cos((M_PI*(FFABS(n - M) - 0.3 * M))/((1 - 0.3) * M)));
151 } else {
152 ✗ lut[n] = 1;
153 }
154 }
155 ✗ *overlap = 0.33;
156 ✗ break;
157 ✗ case WFUNC_DOLPH: {
158 ✗ double b = cosh(7.6009022095419887 / (N-1)), sum, t, c, norm = 0;
159 int j;
160 ✗ for (c = 1 - 1 / (b*b), n = (N-1) / 2; n >= 0; --n) {
161 ✗ for (sum = !n, b = t = j = 1; j <= n && sum != t; b *= (n-j) * (1./j), ++j)
162 ✗ t = sum, sum += (b *= c * (N - n - j) * (1./j));
163 ✗ sum /= (N - 1 - n), norm = norm ? norm : sum, sum /= norm;
164 ✗ lut[n] = sum;
165 ✗ lut[N - 1 - n] = sum;
166 }
167 ✗ *overlap = 0.5;}
168 ✗ break;
169 ✗ case WFUNC_CAUCHY:
170 ✗ for (n = 0; n < N; n++) {
171 ✗ double x = 2 * ((n / (double)(N - 1)) - .5);
172
173 ✗ if (x <= -.5 || x >= .5) {
174 ✗ lut[n] = 0;
175 } else {
176 ✗ lut[n] = FFMIN(1, fabs(1/(1+4*16*x*x)));
177 }
178 }
179 ✗ *overlap = 0.75;
180 ✗ break;
181 ✗ case WFUNC_PARZEN:
182 ✗ for (n = 0; n < N; n++) {
183 ✗ double x = 2 * ((n / (double)(N - 1)) - .5);
184
185 ✗ if (x > 0.25 && x <= 0.5) {
186 ✗ lut[n] = -2 * powf(-1 + 2 * x, 3);
187 ✗ } else if (x >= -.5 && x < -.25) {
188 ✗ lut[n] = 2 * powf(1 + 2 * x, 3);
189 ✗ } else if (x >= -.25 && x < 0) {
190 ✗ lut[n] = 1 - 24 * x * x - 48 * x * x * x;
191 ✗ } else if (x >= 0 && x <= .25) {
192 ✗ lut[n] = 1 - 24 * x * x + 48 * x * x * x;
193 } else {
194 ✗ lut[n] = 0;
195 }
196 }
197 ✗ *overlap = 0.75;
198 ✗ break;
199 ✗ case WFUNC_POISSON:
200 ✗ for (n = 0; n < N; n++) {
201 ✗ double x = 2 * ((n / (double)(N - 1)) - .5);
202
203 ✗ if (x >= 0 && x <= .5) {
204 ✗ lut[n] = exp(-6*x);
205 ✗ } else if (x < 0 && x >= -.5) {
206 ✗ lut[n] = exp(6*x);
207 } else {
208 ✗ lut[n] = 0;
209 }
210 }
211 ✗ *overlap = 0.75;
212 ✗ break;
213 ✗ case WFUNC_BOHMAN:
214 ✗ for (n = 0; n < N; n++) {
215 ✗ double x = 2 * ((n / (double)(N - 1))) - 1.;
216
217 ✗ lut[n] = (1 - fabs(x)) * cos(M_PI*fabs(x)) + 1./M_PI*sin(M_PI*fabs(x));
218 }
219 ✗ *overlap = 0.75;
220 ✗ break;
221 ✗ case WFUNC_KAISER:
222 {
223 ✗ double scale = 1.0 / av_bessel_i0(12.);
224 ✗ for (n = 0; n < N; n++) {
225 ✗ double x = 2.0 / (double)(N - 1);
226 ✗ lut[n] = av_bessel_i0(12. * sqrt(1. - SQR(n * x - 1.))) * scale;
227 }
228 ✗ *overlap = 0.75;
229 ✗ break;
230 }
231 ✗ default:
232 ✗ av_assert0(0);
233 }
234 ✗ }
235
236 #endif /* AVFILTER_WINDOW_FUNC_H */
237