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Diffstat (limited to 'libavfilter/window_func.c')
| -rw-r--r-- | libavfilter/window_func.c | 178 |
1 files changed, 0 insertions, 178 deletions
diff --git a/libavfilter/window_func.c b/libavfilter/window_func.c deleted file mode 100644 index acf1b20847..0000000000 --- a/libavfilter/window_func.c +++ /dev/null @@ -1,178 +0,0 @@ -/* - * Copyright (c) 2015 Paul B Mahol - * - * This file is part of FFmpeg. - * - * FFmpeg is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - * - * FFmpeg is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with FFmpeg; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ - -#include <math.h> - -#include "libavutil/avassert.h" -#include "window_func.h" - -void ff_generate_window_func(float *lut, int N, int win_func, float *overlap) -{ - int n; - - switch (win_func) { - case WFUNC_RECT: - for (n = 0; n < N; n++) - lut[n] = 1.; - *overlap = 0.; - break; - case WFUNC_BARTLETT: - for (n = 0; n < N; n++) - lut[n] = 1.-fabs((n-(N-1)/2.)/((N-1)/2.)); - *overlap = 0.5; - break; - case WFUNC_HANNING: - for (n = 0; n < N; n++) - lut[n] = .5*(1-cos(2*M_PI*n/(N-1))); - *overlap = 0.5; - break; - case WFUNC_HAMMING: - for (n = 0; n < N; n++) - lut[n] = .54-.46*cos(2*M_PI*n/(N-1)); - *overlap = 0.5; - break; - case WFUNC_BLACKMAN: - for (n = 0; n < N; n++) - lut[n] = .42659-.49656*cos(2*M_PI*n/(N-1))+.076849*cos(4*M_PI*n/(N-1)); - *overlap = 0.661; - break; - case WFUNC_WELCH: - for (n = 0; n < N; n++) - lut[n] = 1.-(n-(N-1)/2.)/((N-1)/2.)*(n-(N-1)/2.)/((N-1)/2.); - *overlap = 0.293; - break; - case WFUNC_FLATTOP: - for (n = 0; n < N; n++) - lut[n] = 1.-1.985844164102*cos( 2*M_PI*n/(N-1))+1.791176438506*cos( 4*M_PI*n/(N-1))- - 1.282075284005*cos( 6*M_PI*n/(N-1))+0.667777530266*cos( 8*M_PI*n/(N-1))- - 0.240160796576*cos(10*M_PI*n/(N-1))+0.056656381764*cos(12*M_PI*n/(N-1))- - 0.008134974479*cos(14*M_PI*n/(N-1))+0.000624544650*cos(16*M_PI*n/(N-1))- - 0.000019808998*cos(18*M_PI*n/(N-1))+0.000000132974*cos(20*M_PI*n/(N-1)); - *overlap = 0.841; - break; - case WFUNC_BHARRIS: - for (n = 0; n < N; n++) - 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)); - *overlap = 0.661; - break; - case WFUNC_BNUTTALL: - for (n = 0; n < N; n++) - 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)); - *overlap = 0.661; - break; - case WFUNC_BHANN: - for (n = 0; n < N; n++) - lut[n] = 0.62-0.48*fabs(n/(double)(N-1)-.5)-0.38*cos(2*M_PI*n/(N-1)); - *overlap = 0.5; - break; - case WFUNC_SINE: - for (n = 0; n < N; n++) - lut[n] = sin(M_PI*n/(N-1)); - *overlap = 0.75; - break; - case WFUNC_NUTTALL: - for (n = 0; n < N; n++) - 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)); - *overlap = 0.663; - break; - case WFUNC_LANCZOS: -#define SINC(x) (!(x)) ? 1 : sin(M_PI * (x))/(M_PI * (x)); - for (n = 0; n < N; n++) - lut[n] = SINC((2.*n)/(N-1)-1); - *overlap = 0.75; - break; - case WFUNC_GAUSS: -#define SQR(x) ((x)*(x)) - for (n = 0; n < N; n++) - lut[n] = exp(-0.5 * SQR((n-(N-1)/2)/(0.4*(N-1)/2.f))); - *overlap = 0.75; - break; - case WFUNC_TUKEY: - for (n = 0; n < N; n++) { - float M = (N-1)/2.; - - if (FFABS(n - M) >= 0.3 * M) { - lut[n] = 0.5 * (1 + cos((M_PI*(FFABS(n - M) - 0.3 * M))/((1 - 0.3) * M))); - } else { - lut[n] = 1; - } - } - *overlap = 0.33; - break; - case WFUNC_DOLPH: { - double b = cosh(7.6009022095419887 / (N-1)), sum, t, c, norm = 0; - int j; - for (c = 1 - 1 / (b*b), n = (N-1) / 2; n >= 0; --n) { - for (sum = !n, b = t = j = 1; j <= n && sum != t; b *= (n-j) * (1./j), ++j) - t = sum, sum += (b *= c * (N - n - j) * (1./j)); - sum /= (N - 1 - n), sum /= (norm = norm ? norm : sum); - lut[n] = sum; - lut[N - 1 - n] = sum; - } - *overlap = 0.5;} - break; - case WFUNC_CAUCHY: - for (n = 0; n < N; n++) { - double x = 2 * ((n / (double)(N - 1)) - .5); - - if (x <= -.5 || x >= .5) { - lut[n] = 0; - } else { - lut[n] = FFMIN(1, fabs(1/(1+4*16*x*x))); - } - } - *overlap = 0.75; - break; - case WFUNC_PARZEN: - for (n = 0; n < N; n++) { - double x = 2 * ((n / (double)(N - 1)) - .5); - - if (x > 0.25 && x <= 0.5) { - lut[n] = -2 * powf(-1 + 2 * x, 3); - } else if (x >= -.5 && x < -.25) { - lut[n] = 2 * powf(1 + 2 * x, 3); - } else if (x >= -.25 && x < 0) { - lut[n] = 1 - 24 * x * x - 48 * x * x * x; - } else if (x >= 0 && x <= .25) { - lut[n] = 1 - 24 * x * x + 48 * x * x * x; - } else { - lut[n] = 0; - } - } - *overlap = 0.75; - break; - case WFUNC_POISSON: - for (n = 0; n < N; n++) { - double x = 2 * ((n / (double)(N - 1)) - .5); - - if (x >= 0 && x <= .5) { - lut[n] = exp(-6*x); - } else if (x < 0 && x >= -.5) { - lut[n] = exp(6*x); - } else { - lut[n] = 0; - } - } - *overlap = 0.75; - break; - default: - av_assert0(0); - } -} |