57 lines
1.4 KiB
C++
57 lines
1.4 KiB
C++
#include "effects/effects.h"
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#include <QGridLayout>
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#include <QSpinBox>
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#include <QLabel>
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#include "ui/collapsiblewidget.h"
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PanEffect::PanEffect(Clip* c) : Effect(c) {
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container = new CollapsibleWidget();
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container->setText(audio_effect_names[AUDIO_PAN_EFFECT]);
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ui = new QWidget();
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QGridLayout* ui_layout = new QGridLayout();
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ui_layout->addWidget(new QLabel("Pan:"), 0, 0);
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pan_val = new QSpinBox();
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pan_val->setMinimum(-100);
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pan_val->setMaximum(100);
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ui_layout->addWidget(pan_val, 0, 1);
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ui->setLayout(ui_layout);
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container->setContents(ui);
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// set defaults
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pan_val->setValue(0);
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}
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Effect* PanEffect::copy() {
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PanEffect* p = new PanEffect(parent_clip);
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p->pan_val->setValue(pan_val->value());
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return p;
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}
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void PanEffect::process_audio(uint8_t *samples, int nb_bytes) {
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for (int i=0;i<nb_bytes;i+=4) {
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int16_t left_sample = (int16_t) ((samples[i+1] << 8) | samples[i]);
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int16_t right_sample = (int16_t) ((samples[i+3] << 8) | samples[i+2]);
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float val = pan_val->value()*0.01;
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if (val < 0) {
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// affect right channel
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right_sample *= (1-abs(val));
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} else {
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// affect left channel
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left_sample *= (1-val);
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}
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samples[i+3] = (uint8_t) (right_sample >> 8);
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samples[i+2] = (uint8_t) right_sample;
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samples[i+1] = (uint8_t) (left_sample >> 8);
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samples[i] = (uint8_t) left_sample;
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}
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}
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