diff options
author | Paul B Mahol <onemda@gmail.com> | 2015-12-28 18:39:31 +0100 |
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committer | Paul B Mahol <onemda@gmail.com> | 2015-12-28 18:54:55 +0100 |
commit | 45b3e6e04e8e93b6ccacf4207b99596e044b72af (patch) | |
tree | 221e62c2a43d2c3dba77cfc0936fdef6b810ab62 /libavfilter/avf_showfreqs.c | |
parent | 67771ac4b894112b743b37e6df24b0d4f27a120b (diff) |
avfilter: move window function generation into separate file
Signed-off-by: Paul B Mahol <onemda@gmail.com>
Diffstat (limited to 'libavfilter/avf_showfreqs.c')
-rw-r--r-- | libavfilter/avf_showfreqs.c | 93 |
1 files changed, 2 insertions, 91 deletions
diff --git a/libavfilter/avf_showfreqs.c b/libavfilter/avf_showfreqs.c index df3fcd1dc0..03fcf4e3a9 100644 --- a/libavfilter/avf_showfreqs.c +++ b/libavfilter/avf_showfreqs.c @@ -32,15 +32,12 @@ #include "video.h" #include "avfilter.h" #include "internal.h" +#include "window_func.h" enum DisplayMode { LINE, BAR, DOT, NB_MODES }; enum ChannelMode { COMBINED, SEPARATE, NB_CMODES }; enum FrequencyScale { FS_LINEAR, FS_LOG, FS_RLOG, NB_FSCALES }; enum AmplitudeScale { AS_LINEAR, AS_SQRT, AS_CBRT, AS_LOG, NB_ASCALES }; -enum WindowFunc { WFUNC_RECT, WFUNC_HANNING, WFUNC_HAMMING, WFUNC_BLACKMAN, - WFUNC_BARTLETT, WFUNC_WELCH, WFUNC_FLATTOP, - WFUNC_BHARRIS, WFUNC_BNUTTALL, WFUNC_SINE, WFUNC_NUTTALL, - WFUNC_BHANN, WFUNC_LANCZOS, WFUNC_GAUSS, NB_WFUNC }; typedef struct ShowFreqsContext { const AVClass *class; @@ -156,92 +153,6 @@ static int query_formats(AVFilterContext *ctx) return 0; } -static void 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; - default: - av_assert0(0); - } -} - static int config_output(AVFilterLink *outlink) { AVFilterContext *ctx = outlink->src; @@ -290,7 +201,7 @@ static int config_output(AVFilterLink *outlink) sizeof(*s->window_func_lut)); if (!s->window_func_lut) return AVERROR(ENOMEM); - generate_window_func(s->window_func_lut, s->win_size, s->win_func, &overlap); + ff_generate_window_func(s->window_func_lut, s->win_size, s->win_func, &overlap); if (s->overlap == 1.) s->overlap = overlap; s->skip_samples = (1. - s->overlap) * s->win_size; |