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avfilter/avf_showcwt: add sqrt frequency scale

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This commit is contained in:
Paul B Mahol 2023-07-09 19:56:10 +02:00
parent 7357012bb5
commit 7f23b72dde
2 changed files with 11 additions and 0 deletions
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1
doc/filters.texi
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@ -30709,6 +30709,7 @@ Set the frequency scale used. Allowed values are:
@item bark
@item mel
@item erbs
@item sqrt
@end table
Default value is @code{linear}.

10
libavfilter/avf_showcwt.c
View File

@ -40,6 +40,7 @@ enum FrequencyScale {
FSCALE_BARK,
FSCALE_MEL,
FSCALE_ERBS,
FSCALE_SQRT,
NB_FSCALE
};
@ -127,6 +128,7 @@ static const AVOption showcwt_options[] = {
{ "bark", "bark", 0, AV_OPT_TYPE_CONST,{.i64=FSCALE_BARK}, 0, 0, FLAGS, "scale" },
{ "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" },
{ "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 },
@ -241,6 +243,10 @@ static void frequency_band(float *frequency_band,
frequency = 676170.4f / (47.06538f - expf(frequency * 0.08950404f)) - 14678.49f;
frequency_derivative *= (frequency * frequency + 14990.4 * frequency + 4577850.f) / 160514.f;
break;
case FSCALE_SQRT:
frequency = frequency * frequency;
frequency_derivative *= 2.f * sqrtf(frequency);
break;
}
frequency_band[y*2 ] = frequency;
@ -680,6 +686,10 @@ static int config_output(AVFilterLink *outlink)
minimum_frequency = 11.17268f * log(1.f + (46.06538f * minimum_frequency) / (minimum_frequency + 14678.49f));
maximum_frequency = 11.17268f * log(1.f + (46.06538f * maximum_frequency) / (maximum_frequency + 14678.49f));
break;
case FSCALE_SQRT:
minimum_frequency = sqrtf(minimum_frequency);
maximum_frequency = sqrtf(maximum_frequency);
break;
}
frequency_band(s->frequency_band,