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#include "paneffect.h"
#include <QGridLayout>
#include <QLabel>
#include <QtMath>
#include <cmath>
#include "ui/labelslider.h"
#include "ui/collapsiblewidget.h"
PanEffect::PanEffect(Clip* c, const EffectMeta *em) : Effect(c, em) {
EffectRow* pan_row = add_row("Pan:");
pan_val = pan_row->add_field(EFFECT_FIELD_DOUBLE, "pan");
pan_val->set_double_minimum_value(-100);
pan_val->set_double_maximum_value(100);
// set defaults
pan_val->set_double_default_value(0);
}
void PanEffect::process_audio(double timecode_start, double timecode_end, quint8* samples, int nb_bytes, int) {
double interval = (timecode_end - timecode_start)/nb_bytes;
for (int i=0;i<nb_bytes;i+=4) {
double pval = log_volume(pan_val->get_double_value(timecode_start+(interval*i), true)*0.01);
qint16 left_sample = (qint16) (((samples[i+1] & 0xFF) << 8) | (samples[i] & 0xFF));
qint16 right_sample = (qint16) (((samples[i+3] & 0xFF) << 8) | (samples[i+2] & 0xFF));
if (pval < 0) {
// affect right channel
right_sample *= (1-std::abs(pval));
} else {
// affect left channel
left_sample *= (1-pval);
}
samples[i+3] = (quint8) (right_sample >> 8);
samples[i+2] = (quint8) right_sample;
samples[i+1] = (quint8) (left_sample >> 8);
samples[i] = (quint8) left_sample;
}
}
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