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avfilter/avf_showcwt: add cbrt frequency scale

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This commit is contained in:
Paul B Mahol 2023-07-09 20:06:46 +02:00
parent 7f23b72dde
commit aee8689ba5
2 changed files with 11 additions and 0 deletions
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1
doc/filters.texi
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@ -30710,6 +30710,7 @@ Set the frequency scale used. Allowed values are:
@item mel
@item erbs
@item sqrt
@item cbrt
@end table
Default value is @code{linear}.

10
libavfilter/avf_showcwt.c
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@ -41,6 +41,7 @@ enum FrequencyScale {
FSCALE_MEL,
FSCALE_ERBS,
FSCALE_SQRT,
FSCALE_CBRT,
NB_FSCALE
};
@ -129,6 +130,7 @@ static const AVOption showcwt_options[] = {
{ "mel", "mel", 0, AV_OPT_TYPE_CONST,{.i64=FSCALE_MEL}, 0, 0, FLAGS, "scale" },
{ "erbs", "erbs", 0, AV_OPT_TYPE_CONST,{.i64=FSCALE_ERBS}, 0, 0, FLAGS, "scale" },
{ "sqrt", "sqrt", 0, AV_OPT_TYPE_CONST,{.i64=FSCALE_SQRT}, 0, 0, FLAGS, "scale" },
{ "cbrt", "cbrt", 0, AV_OPT_TYPE_CONST,{.i64=FSCALE_CBRT}, 0, 0, FLAGS, "scale" },
{ "min", "set minimum frequency", OFFSET(minimum_frequency), AV_OPT_TYPE_FLOAT, {.dbl = 20.}, 1, 2000, FLAGS },
{ "max", "set maximum frequency", OFFSET(maximum_frequency), AV_OPT_TYPE_FLOAT, {.dbl = 20000.}, 0, 192000, FLAGS },
{ "logb", "set logarithmic basis", OFFSET(logarithmic_basis), AV_OPT_TYPE_FLOAT, {.dbl = 0.0001}, 0, 1, FLAGS },
@ -247,6 +249,10 @@ static void frequency_band(float *frequency_band,
frequency = frequency * frequency;
frequency_derivative *= 2.f * sqrtf(frequency);
break;
case FSCALE_CBRT:
frequency = frequency * frequency * frequency;
frequency_derivative *= 3.f * powf(frequency, 2.f / 3.f);
break;
}
frequency_band[y*2 ] = frequency;
@ -690,6 +696,10 @@ static int config_output(AVFilterLink *outlink)
minimum_frequency = sqrtf(minimum_frequency);
maximum_frequency = sqrtf(maximum_frequency);
break;
case FSCALE_CBRT:
minimum_frequency = cbrtf(minimum_frequency);
maximum_frequency = cbrtf(maximum_frequency);
break;
}
frequency_band(s->frequency_band,