44 lines
1.4 KiB
C++
44 lines
1.4 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) : Effect(c, EFFECT_TYPE_AUDIO, AUDIO_PAN_EFFECT) {
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EffectRow* pan_row = add_row("Pan:");
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pan_val = pan_row->add_field(EFFECT_FIELD_DOUBLE);
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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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connect(pan_val, SIGNAL(changed()), this, SLOT(field_changed()));
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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 pval = qSqrt(pan_val->get_double_value(timecode_start+(interval*i), true)*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 (pval < 0) {
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// affect right channel
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right_sample *= (1-std::abs(pval));
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} else {
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// affect left channel
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left_sample *= (1-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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