44 lines
1.3 KiB
C++
44 lines
1.3 KiB
C++
#include "paneffect.h"
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#include <QGridLayout>
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#include <QLabel>
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#include <QtMath>
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#include <cmath>
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#include "ui/labelslider.h"
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#include "ui/collapsiblewidget.h"
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PanEffect::PanEffect(Clip* c, const EffectMeta *em) : Effect(c, em) {
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EffectRow* pan_row = add_row(tr("Pan"));
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pan_val = pan_row->add_field(EFFECT_FIELD_DOUBLE, "pan");
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pan_val->set_double_minimum_value(-100);
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pan_val->set_double_maximum_value(100);
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// set defaults
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pan_val->set_double_default_value(0);
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}
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void PanEffect::process_audio(double timecode_start, double timecode_end, quint8* samples, int nb_bytes, int) {
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double interval = (timecode_end - timecode_start)/nb_bytes;
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for (int i=0;i<nb_bytes;i+=4) {
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double pan_field_val = pan_val->get_double_value(timecode_start+(interval*i), true);
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double pval = log_volume(qAbs(pan_field_val)*0.01);
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qint16 left_sample = qint16(((samples[i+1] & 0xFF) << 8) | (samples[i] & 0xFF));
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qint16 right_sample = qint16(((samples[i+3] & 0xFF) << 8) | (samples[i+2] & 0xFF));
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if (pan_field_val < 0) {
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// affect right channel
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right_sample *= (1.0-pval);
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} else {
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// affect left channel
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left_sample *= (1.0-pval);
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}
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samples[i+3] = quint8(right_sample >> 8);
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samples[i+2] = quint8(right_sample);
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samples[i+1] = quint8(left_sample >> 8);
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samples[i] = quint8(left_sample);
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}
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}
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