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avfilter/avf_showcwt: add fm frequency scaler

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This commit is contained in:
Paul B Mahol 2023-11-11 00:44:36 +01:00
parent 409b29d3f9
commit 49719d3cb5
2 changed files with 13 additions and 1 deletions
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1
doc/filters.texi
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@ -30842,6 +30842,7 @@ Set the frequency scale used. Allowed values are:
@item sqrt
@item cbrt
@item qdrt
@item fm
@end table
Default value is @code{linear}.

13
libavfilter/avf_showcwt.c
View File

@ -45,6 +45,7 @@ enum FrequencyScale {
FSCALE_SQRT,
FSCALE_CBRT,
FSCALE_QDRT,
FSCALE_FM,
NB_FSCALE
};
@ -144,6 +145,7 @@ static const AVOption showcwt_options[] = {
{ "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" },
{ "qdrt", "qdrt", 0, AV_OPT_TYPE_CONST,{.i64=FSCALE_QDRT}, 0, 0, FLAGS, "scale" },
{ "fm", "fm", 0, AV_OPT_TYPE_CONST,{.i64=FSCALE_FM}, 0, 0, FLAGS, "scale" },
{ "iscale", "set intensity scale", OFFSET(intensity_scale),AV_OPT_TYPE_INT, {.i64=0}, 0, NB_ISCALE-1, FLAGS, "iscale" },
{ "linear", "linear", 0, AV_OPT_TYPE_CONST,{.i64=ISCALE_LINEAR}, 0, 0, FLAGS, "iscale" },
{ "log", "logarithmic", 0, AV_OPT_TYPE_CONST,{.i64=ISCALE_LOG}, 0, 0, FLAGS, "iscale" },
@ -292,6 +294,10 @@ static float frequency_band(float *frequency_band,
frequency = frequency * frequency * frequency * frequency;
frequency_derivative *= 4.f * powf(frequency, 3.f / 4.f);
break;
case FSCALE_FM:
frequency = 2.f * powf(frequency, 3.f / 2.f) / 3.f;
frequency_derivative *= sqrtf(frequency);
break;
}
frequency_band[y*2 ] = frequency;
@ -788,7 +794,8 @@ static int config_output(AVFilterLink *outlink)
AVFilterContext *ctx = outlink->src;
AVFilterLink *inlink = ctx->inputs[0];
ShowCWTContext *s = ctx->priv;
float maximum_frequency = fminf(s->maximum_frequency, inlink->sample_rate * 0.5f);
const float limit_frequency = inlink->sample_rate * 0.5f;
float maximum_frequency = fminf(s->maximum_frequency, limit_frequency);
float minimum_frequency = s->minimum_frequency;
float scale = 1.f, factor;
int ret;
@ -847,6 +854,10 @@ static int config_output(AVFilterLink *outlink)
minimum_frequency = powf(minimum_frequency, 0.25f);
maximum_frequency = powf(maximum_frequency, 0.25f);
break;
case FSCALE_FM:
minimum_frequency = powf(9.f * (minimum_frequency * minimum_frequency) / 4.f, 1.f / 3.f);
maximum_frequency = powf(9.f * (maximum_frequency * maximum_frequency) / 4.f, 1.f / 3.f);
break;
}
s->frequency_band = av_calloc(s->frequency_band_count,