FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavfilter/window_func.h
Date: 2022-12-05 20:26:17
Exec Total Coverage
Lines: 0 148 0.0%
Functions: 0 2 0.0%
Branches: 0 108 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, "win_func" }, \
39 { "rect", "Rectangular", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_RECT}, 0, 0, flag, "win_func" }, \
40 { "bartlett", "Bartlett", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BARTLETT}, 0, 0, flag, "win_func" }, \
41 { "hann", "Hann", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING}, 0, 0, flag, "win_func" }, \
42 { "hanning", "Hanning", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING}, 0, 0, flag, "win_func" }, \
43 { "hamming", "Hamming", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HAMMING}, 0, 0, flag, "win_func" }, \
44 { "blackman", "Blackman", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BLACKMAN}, 0, 0, flag, "win_func" }, \
45 { "welch", "Welch", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_WELCH}, 0, 0, flag, "win_func" }, \
46 { "flattop", "Flat-top", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_FLATTOP}, 0, 0, flag, "win_func" }, \
47 { "bharris", "Blackman-Harris", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHARRIS}, 0, 0, flag, "win_func" }, \
48 { "bnuttall", "Blackman-Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BNUTTALL}, 0, 0, flag, "win_func" }, \
49 { "bhann", "Bartlett-Hann", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHANN}, 0, 0, flag, "win_func" }, \
50 { "sine", "Sine", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_SINE}, 0, 0, flag, "win_func" }, \
51 { "nuttall", "Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_NUTTALL}, 0, 0, flag, "win_func" }, \
52 { "lanczos", "Lanczos", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_LANCZOS}, 0, 0, flag, "win_func" }, \
53 { "gauss", "Gauss", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_GAUSS}, 0, 0, flag, "win_func" }, \
54 { "tukey", "Tukey", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_TUKEY}, 0, 0, flag, "win_func" }, \
55 { "dolph", "Dolph-Chebyshev", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_DOLPH}, 0, 0, flag, "win_func" }, \
56 { "cauchy", "Cauchy", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_CAUCHY}, 0, 0, flag, "win_func" }, \
57 { "parzen", "Parzen", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_PARZEN}, 0, 0, flag, "win_func" }, \
58 { "poisson", "Poisson", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_POISSON}, 0, 0, flag, "win_func" }, \
59 { "bohman", "Bohman", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BOHMAN}, 0, 0, flag, "win_func" }, \
60 { "kaiser", "Kaiser", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_KAISER}, 0, 0, flag, "win_func" }
61
62 static inline double get_i0(double x)
63 {
64 double y = 1.0, prev = 1.0, i = 1.0;
65
66 while (fabs(prev) > 1e-20) {
67 double summand = prev * x * x / (4 * i * i);
68 y += summand;
69 prev = summand;
70 i++;
71 }
72
73 return y;
74 }
75
76 static inline void generate_window_func(float *lut, int N, int win_func,
77 float *overlap)
78 {
79 int n;
80
81 switch (win_func) {
82 case WFUNC_RECT:
83 for (n = 0; n < N; n++)
84 lut[n] = 1.;
85 *overlap = 0.;
86 break;
87 case WFUNC_BARTLETT:
88 for (n = 0; n < N; n++)
89 lut[n] = 1.-fabs((n-(N-1)/2.)/((N-1)/2.));
90 *overlap = 0.5;
91 break;
92 case WFUNC_HANNING:
93 for (n = 0; n < N; n++)
94 lut[n] = .5*(1-cos(2*M_PI*n/(N-1)));
95 *overlap = 0.5;
96 break;
97 case WFUNC_HAMMING:
98 for (n = 0; n < N; n++)
99 lut[n] = .54-.46*cos(2*M_PI*n/(N-1));
100 *overlap = 0.5;
101 break;
102 case WFUNC_BLACKMAN:
103 for (n = 0; n < N; n++)
104 lut[n] = .42659-.49656*cos(2*M_PI*n/(N-1))+.076849*cos(4*M_PI*n/(N-1));
105 *overlap = 0.661;
106 break;
107 case WFUNC_WELCH:
108 for (n = 0; n < N; n++)
109 lut[n] = 1.-(n-(N-1)/2.)/((N-1)/2.)*(n-(N-1)/2.)/((N-1)/2.);
110 *overlap = 0.293;
111 break;
112 case WFUNC_FLATTOP:
113 for (n = 0; n < N; n++)
114 lut[n] = 1.-1.985844164102*cos( 2*M_PI*n/(N-1))+1.791176438506*cos( 4*M_PI*n/(N-1))-
115 1.282075284005*cos( 6*M_PI*n/(N-1))+0.667777530266*cos( 8*M_PI*n/(N-1))-
116 0.240160796576*cos(10*M_PI*n/(N-1))+0.056656381764*cos(12*M_PI*n/(N-1))-
117 0.008134974479*cos(14*M_PI*n/(N-1))+0.000624544650*cos(16*M_PI*n/(N-1))-
118 0.000019808998*cos(18*M_PI*n/(N-1))+0.000000132974*cos(20*M_PI*n/(N-1));
119 *overlap = 0.841;
120 break;
121 case WFUNC_BHARRIS:
122 for (n = 0; n < N; n++)
123 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));
124 *overlap = 0.661;
125 break;
126 case WFUNC_BNUTTALL:
127 for (n = 0; n < N; n++)
128 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));
129 *overlap = 0.661;
130 break;
131 case WFUNC_BHANN:
132 for (n = 0; n < N; n++)
133 lut[n] = 0.62-0.48*fabs(n/(double)(N-1)-.5)-0.38*cos(2*M_PI*n/(N-1));
134 *overlap = 0.5;
135 break;
136 case WFUNC_SINE:
137 for (n = 0; n < N; n++)
138 lut[n] = sin(M_PI*n/(N-1));
139 *overlap = 0.75;
140 break;
141 case WFUNC_NUTTALL:
142 for (n = 0; n < N; n++)
143 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));
144 *overlap = 0.663;
145 break;
146 case WFUNC_LANCZOS:
147 #define SINC(x) (!(x)) ? 1 : sin(M_PI * (x))/(M_PI * (x));
148 for (n = 0; n < N; n++)
149 lut[n] = SINC((2.*n)/(N-1)-1);
150 *overlap = 0.75;
151 break;
152 case WFUNC_GAUSS:
153 #define SQR(x) ((x)*(x))
154 for (n = 0; n < N; n++)
155 lut[n] = exp(-0.5 * SQR((n-(N-1)/2)/(0.4*(N-1)/2.f)));
156 *overlap = 0.75;
157 break;
158 case WFUNC_TUKEY:
159 for (n = 0; n < N; n++) {
160 float M = (N-1)/2.;
161
162 if (FFABS(n - M) >= 0.3 * M) {
163 lut[n] = 0.5 * (1 + cos((M_PI*(FFABS(n - M) - 0.3 * M))/((1 - 0.3) * M)));
164 } else {
165 lut[n] = 1;
166 }
167 }
168 *overlap = 0.33;
169 break;
170 case WFUNC_DOLPH: {
171 double b = cosh(7.6009022095419887 / (N-1)), sum, t, c, norm = 0;
172 int j;
173 for (c = 1 - 1 / (b*b), n = (N-1) / 2; n >= 0; --n) {
174 for (sum = !n, b = t = j = 1; j <= n && sum != t; b *= (n-j) * (1./j), ++j)
175 t = sum, sum += (b *= c * (N - n - j) * (1./j));
176 sum /= (N - 1 - n), norm = norm ? norm : sum, sum /= norm;
177 lut[n] = sum;
178 lut[N - 1 - n] = sum;
179 }
180 *overlap = 0.5;}
181 break;
182 case WFUNC_CAUCHY:
183 for (n = 0; n < N; n++) {
184 double x = 2 * ((n / (double)(N - 1)) - .5);
185
186 if (x <= -.5 || x >= .5) {
187 lut[n] = 0;
188 } else {
189 lut[n] = FFMIN(1, fabs(1/(1+4*16*x*x)));
190 }
191 }
192 *overlap = 0.75;
193 break;
194 case WFUNC_PARZEN:
195 for (n = 0; n < N; n++) {
196 double x = 2 * ((n / (double)(N - 1)) - .5);
197
198 if (x > 0.25 && x <= 0.5) {
199 lut[n] = -2 * powf(-1 + 2 * x, 3);
200 } else if (x >= -.5 && x < -.25) {
201 lut[n] = 2 * powf(1 + 2 * x, 3);
202 } else if (x >= -.25 && x < 0) {
203 lut[n] = 1 - 24 * x * x - 48 * x * x * x;
204 } else if (x >= 0 && x <= .25) {
205 lut[n] = 1 - 24 * x * x + 48 * x * x * x;
206 } else {
207 lut[n] = 0;
208 }
209 }
210 *overlap = 0.75;
211 break;
212 case WFUNC_POISSON:
213 for (n = 0; n < N; n++) {
214 double x = 2 * ((n / (double)(N - 1)) - .5);
215
216 if (x >= 0 && x <= .5) {
217 lut[n] = exp(-6*x);
218 } else if (x < 0 && x >= -.5) {
219 lut[n] = exp(6*x);
220 } else {
221 lut[n] = 0;
222 }
223 }
224 *overlap = 0.75;
225 break;
226 case WFUNC_BOHMAN:
227 for (n = 0; n < N; n++) {
228 double x = 2 * ((n / (double)(N - 1))) - 1.;
229
230 lut[n] = (1 - fabs(x)) * cos(M_PI*fabs(x)) + 1./M_PI*sin(M_PI*fabs(x));
231 }
232 *overlap = 0.75;
233 break;
234 case WFUNC_KAISER:
235 for (n = 0; n < N; n++) {
236 double x = 2.0 / (double)(N - 1);
237
238 lut[n] = get_i0(12. * sqrt(1. - SQR(n * x - 1.))) / get_i0(12.);
239 }
240 *overlap = 0.75;
241 break;
242 default:
243 av_assert0(0);
244 }
245 }
246
247 #endif /* AVFILTER_WINDOW_FUNC_H */
248