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avfilter/window_func: add dolph window

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This commit is contained in:
Paul B Mahol 2016-08-16 14:30:43 +02:00
parent c3c4c72665
commit ea58dd2beb
5 changed files with 20 additions and 1 deletions
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3
doc/filters.texi
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@ -16518,6 +16518,7 @@ It accepts the following values:
@item lanczos
@item gauss
@item tukey
@item dolph
@end table
Default is @code{hanning}.
@ -16665,6 +16666,7 @@ It accepts the following values:
@item lanczos
@item gauss
@item tukey
@item dolph
@end table
Default value is @code{hann}.
@ -16808,6 +16810,7 @@ It accepts the following values:
@item lanczos
@item gauss
@item tukey
@item dolph
@end table
Default value is @code{hann}.

1
libavfilter/avf_showfreqs.c
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@ -112,6 +112,7 @@ static const AVOption showfreqs_options[] = {
{ "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" },
{ "tukey", "Tukey", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_TUKEY}, 0, 0, FLAGS, "win_func" },
{ "dolph", "Dolph-Chebyshev", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_DOLPH}, 0, 0, FLAGS, "win_func" },
{ "overlap", "set window overlap", OFFSET(overlap), AV_OPT_TYPE_FLOAT, {.dbl=1.}, 0., 1., FLAGS },
{ "averaging", "set time averaging", OFFSET(avg), AV_OPT_TYPE_INT, {.i64=1}, 0, INT32_MAX, FLAGS },
{ "colors", "set channels colors", OFFSET(colors), AV_OPT_TYPE_STRING, {.str = "red|green|blue|yellow|orange|lime|pink|magenta|brown" }, 0, 0, FLAGS },

2
libavfilter/avf_showspectrum.c
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@ -133,6 +133,7 @@ static const AVOption showspectrum_options[] = {
{ "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" },
{ "tukey", "Tukey", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_TUKEY}, 0, 0, FLAGS, "win_func" },
{ "dolph", "Dolph-Chebyshev", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_DOLPH}, 0, 0, FLAGS, "win_func" },
{ "orientation", "set orientation", OFFSET(orientation), AV_OPT_TYPE_INT, {.i64=VERTICAL}, 0, NB_ORIENTATIONS-1, FLAGS, "orientation" },
{ "vertical", NULL, 0, AV_OPT_TYPE_CONST, {.i64=VERTICAL}, 0, 0, FLAGS, "orientation" },
{ "horizontal", NULL, 0, AV_OPT_TYPE_CONST, {.i64=HORIZONTAL}, 0, 0, FLAGS, "orientation" },
@ -942,6 +943,7 @@ static const AVOption showspectrumpic_options[] = {
{ "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" },
{ "tukey", "Tukey", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_TUKEY}, 0, 0, FLAGS, "win_func" },
{ "dolph", "Dolph-Chebyshev", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_DOLPH}, 0, 0, FLAGS, "win_func" },
{ "orientation", "set orientation", OFFSET(orientation), AV_OPT_TYPE_INT, {.i64=VERTICAL}, 0, NB_ORIENTATIONS-1, FLAGS, "orientation" },
{ "vertical", NULL, 0, AV_OPT_TYPE_CONST, {.i64=VERTICAL}, 0, 0, FLAGS, "orientation" },
{ "horizontal", NULL, 0, AV_OPT_TYPE_CONST, {.i64=HORIZONTAL}, 0, 0, FLAGS, "orientation" },

12
libavfilter/window_func.c
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@ -116,6 +116,18 @@ void ff_generate_window_func(float *lut, int N, int win_func, float *overlap)
}
*overlap = 0.33;
break;
case WFUNC_DOLPH: {
double b = cosh(acosh(pow(10., 3)) / (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;
default:
av_assert0(0);
}

3
libavfilter/window_func.h
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@ -25,7 +25,8 @@
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, WFUNC_TUKEY, NB_WFUNC };
WFUNC_BHANN, WFUNC_LANCZOS, WFUNC_GAUSS, WFUNC_TUKEY,
WFUNC_DOLPH, NB_WFUNC };
void ff_generate_window_func(float *lut, int N, int win_func, float *overlap);