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avfilter/avf_showspectrum: use ff_generate_window_func

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Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2015-12-28 18:51:56 +01:00
parent 45b3e6e04e
commit f88546b426
3 changed files with 32 additions and 32 deletions
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17
doc/filters.texi
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@ -14647,14 +14647,21 @@ Set window function.
It accepts the following values:
@table @samp
@item none
No samples pre-processing (do not expect this to be faster)
@item rect
@item bartlett
@item hann
Hann window
@item hanning
@item hamming
Hamming window
@item blackman
Blackman window
@item welch
@item flattop
@item bharris
@item bnuttall
@item bhann
@item sine
@item nuttall
@item lanczos
@item gauss
@end table
Default value is @code{hann}.

2
libavfilter/Makefile
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@ -285,7 +285,7 @@ OBJS-$(CONFIG_AVECTORSCOPE_FILTER) += avf_avectorscope.o
OBJS-$(CONFIG_CONCAT_FILTER) += avf_concat.o
OBJS-$(CONFIG_SHOWCQT_FILTER) += avf_showcqt.o lswsutils.o lavfutils.o
OBJS-$(CONFIG_SHOWFREQS_FILTER) += avf_showfreqs.o window_func.o
OBJS-$(CONFIG_SHOWSPECTRUM_FILTER) += avf_showspectrum.o
OBJS-$(CONFIG_SHOWSPECTRUM_FILTER) += avf_showspectrum.o window_func.o
OBJS-$(CONFIG_SHOWVOLUME_FILTER) += avf_showvolume.o
OBJS-$(CONFIG_SHOWWAVES_FILTER) += avf_showwaves.o
OBJS-$(CONFIG_SHOWWAVESPIC_FILTER) += avf_showwaves.o

45
libavfilter/avf_showspectrum.c
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@ -33,11 +33,11 @@
#include "libavutil/opt.h"
#include "avfilter.h"
#include "internal.h"
#include "window_func.h"
enum DisplayMode { COMBINED, SEPARATE, NB_MODES };
enum DisplayScale { LINEAR, SQRT, CBRT, LOG, NB_SCALES };
enum ColorMode { CHANNEL, INTENSITY, NB_CLMODES };
enum WindowFunc { WFUNC_NONE, WFUNC_HANN, WFUNC_HAMMING, WFUNC_BLACKMAN, NB_WFUNC };
enum SlideMode { REPLACE, SCROLL, FULLFRAME, RSCROLL, NB_SLIDES };
typedef struct {
@ -57,6 +57,7 @@ typedef struct {
FFTSample **rdft_data; ///< bins holder for each (displayed) channels
float *window_func_lut; ///< Window function LUT
int win_func;
float overlap;
float *combine_buffer; ///< color combining buffer (3 * h items)
} ShowSpectrumContext;
@ -83,10 +84,22 @@ static const AVOption showspectrum_options[] = {
{ "log", "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=LOG}, 0, 0, FLAGS, "scale" },
{ "lin", "linear", 0, AV_OPT_TYPE_CONST, {.i64=LINEAR}, 0, 0, FLAGS, "scale" },
{ "saturation", "color saturation multiplier", OFFSET(saturation), AV_OPT_TYPE_FLOAT, {.dbl = 1}, -10, 10, FLAGS },
{ "win_func", "set window function", OFFSET(win_func), AV_OPT_TYPE_INT, {.i64 = WFUNC_HANN}, 0, NB_WFUNC-1, FLAGS, "win_func" },
{ "hann", "Hann window", 0, AV_OPT_TYPE_CONST, {.i64 = WFUNC_HANN}, 0, 0, FLAGS, "win_func" },
{ "hamming", "Hamming window", 0, AV_OPT_TYPE_CONST, {.i64 = WFUNC_HAMMING}, 0, 0, FLAGS, "win_func" },
{ "blackman", "Blackman window", 0, AV_OPT_TYPE_CONST, {.i64 = WFUNC_BLACKMAN}, 0, 0, FLAGS, "win_func" },
{ "win_func", "set window function", OFFSET(win_func), AV_OPT_TYPE_INT, {.i64 = WFUNC_HANNING}, 0, NB_WFUNC-1, FLAGS, "win_func" },
{ "rect", "Rectangular", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_RECT}, 0, 0, FLAGS, "win_func" },
{ "bartlett", "Bartlett", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BARTLETT}, 0, 0, FLAGS, "win_func" },
{ "hann", "Hann", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING}, 0, 0, FLAGS, "win_func" },
{ "hanning", "Hanning", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING}, 0, 0, FLAGS, "win_func" },
{ "hamming", "Hamming", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HAMMING}, 0, 0, FLAGS, "win_func" },
{ "blackman", "Blackman", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BLACKMAN}, 0, 0, FLAGS, "win_func" },
{ "welch", "Welch", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_WELCH}, 0, 0, FLAGS, "win_func" },
{ "flattop", "Flat-top", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_FLATTOP}, 0, 0, FLAGS, "win_func" },
{ "bharris", "Blackman-Harris", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHARRIS}, 0, 0, FLAGS, "win_func" },
{ "bnuttall", "Blackman-Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BNUTTALL}, 0, 0, FLAGS, "win_func" },
{ "bhann", "Bartlett-Hann", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHANN}, 0, 0, FLAGS, "win_func" },
{ "sine", "Sine", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_SINE}, 0, 0, FLAGS, "win_func" },
{ "nuttall", "Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_NUTTALL}, 0, 0, FLAGS, "win_func" },
{ "lanczos", "Lanczos", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_LANCZOS}, 0, 0, FLAGS, "win_func" },
{ "gauss", "Gauss", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_GAUSS}, 0, 0, FLAGS, "win_func" },
{ NULL }
};
@ -203,27 +216,7 @@ static int config_output(AVFilterLink *outlink)
sizeof(*s->window_func_lut));
if (!s->window_func_lut)
return AVERROR(ENOMEM);
switch (s->win_func) {
case WFUNC_NONE:
for (i = 0; i < win_size; i++)
s->window_func_lut[i] = 1.;
break;
case WFUNC_HANN:
for (i = 0; i < win_size; i++)
s->window_func_lut[i] = .5f * (1 - cos(2*M_PI*i / (win_size-1)));
break;
case WFUNC_HAMMING:
for (i = 0; i < win_size; i++)
s->window_func_lut[i] = .54f - .46f * cos(2*M_PI*i / (win_size-1));
break;
case WFUNC_BLACKMAN: {
for (i = 0; i < win_size; i++)
s->window_func_lut[i] = .42f - .5f*cos(2*M_PI*i / (win_size-1)) + .08f*cos(4*M_PI*i / (win_size-1));
break;
}
default:
av_assert0(0);
}
ff_generate_window_func(s->window_func_lut, win_size, s->win_func, &s->overlap);
/* prepare the initial picref buffer (black frame) */
av_frame_free(&s->outpicref);