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avfilter/showspectrum: add win_func option.

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This commit is contained in:
Clément Bœsch 2013-11-20 16:20:11 +01:00
parent ec312c1fd0
commit 3e69f7c221
2 changed files with 38 additions and 4 deletions
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15
doc/filters.texi
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@ -9770,6 +9770,21 @@ Set saturation modifier for displayed colors. Negative values provide
alternative color scheme. @code{0} is no saturation at all.
Saturation must be in [-10.0, 10.0] range.
Default value is @code{1}.
@item win_func
Set window function.
It accepts the following values:
@table @samp
@item none
No samples pre-processing (do not expect this to be faster)
@item hann
Hann window
@item hamming
Hamming window
@end table
Default value is @code{hann}.
@end table
The usage is very similar to the showwaves filter; see the examples in that

27
libavfilter/avf_showspectrum.c
View File

@ -1,5 +1,5 @@
/*
* Copyright (c) 2012 Clément Bœsch
* Copyright (c) 2012-2013 Clément Bœsch
* Copyright (c) 2013 Rudolf Polzer <divverent@xonotic.org>
*
* This file is part of FFmpeg.
@ -37,6 +37,7 @@
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, NB_WFUNC };
typedef struct {
const AVClass *class;
@ -57,6 +58,7 @@ typedef struct {
int filled; ///< number of samples (per channel) filled in current rdft_buffer
int consumed; ///< number of samples (per channel) consumed from the input frame
float *window_func_lut; ///< Window function LUT
enum WindowFunc win_func;
float *combine_buffer; ///< color combining buffer (3 * h items)
} ShowSpectrumContext;
@ -79,6 +81,9 @@ 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}, INT_MIN, INT_MAX, FLAGS, "win_func" },
{ "hamming", "Hamming window", 0, AV_OPT_TYPE_CONST, {.i64 = WFUNC_HAMMING}, INT_MIN, INT_MAX, FLAGS, "win_func" },
{ NULL }
};
@ -195,14 +200,28 @@ static int config_output(AVFilterLink *outlink)
}
s->filled = 0;
/* pre-calc windowing function (hann here) */
/* pre-calc windowing function */
s->window_func_lut =
av_realloc_f(s->window_func_lut, win_size,
sizeof(*s->window_func_lut));
if (!s->window_func_lut)
return AVERROR(ENOMEM);
for (i = 0; i < win_size; i++)
s->window_func_lut[i] = .5f * (1 - cos(2*M_PI*i / (win_size-1)));
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;
default:
av_assert0(0);
}
/* prepare the initial picref buffer (black frame) */
av_frame_free(&s->outpicref);