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plugin spectrum analysis: plot A/B

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This commit is contained in:
Robin Gareus 2016-07-25 17:45:14 +02:00
parent 822810b88f
commit 793ff25e08
1 changed files with 6 additions and 13 deletions
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19
gtk2_ardour/plugin_eq_gui.cc
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@ -808,26 +808,19 @@ PluginEqGui::plot_signal_amplitude_difference(Gtk::Widget *w, cairo_t *cr)
float height = w->get_height();
cairo_set_source_rgb(cr, 0.0, 1.0, 0.0);
cairo_set_line_width (cr, 2.5);
cairo_set_line_width (cr, 1.5);
for (uint32_t i = 0; i < _signal_input_fft->bins()-1; i++) {
// x coordinate of bin i
x = log10f(1.0 + (float)i / (float)_signal_input_fft->bins() * _log_coeff) / _log_max;
x *= _analysis_width;
float power_out = power_to_dB(_signal_output_fft->power_at_bin(i));
float power_in = power_to_dB(_signal_input_fft ->power_at_bin(i));
float power = power_out - power_in;
float power_out = _signal_output_fft->power_at_bin (i) + 1e-30;
float power_in = _signal_input_fft ->power_at_bin (i) + 1e-30;
float power = power_to_dB (power_out / power_in);
if (ISINF(power)) {
if (power < 0) {
power = _min_dB - 1.0;
} else {
power = _max_dB - 1.0;
}
} else if (ISNAN(power)) {
power = _min_dB - 1.0;
}
assert (!ISINF(power));
assert (!ISNAN(power));
float yCoeff = ( power - _min_dB) / (_max_dB - _min_dB);