69 lines
1.8 KiB
C++
69 lines
1.8 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 <cmath>
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#include "ui/collapsiblewidget.h"
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PanEffect::PanEffect(Clip* c) : Effect(c) {
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setup_effect(EFFECT_TYPE_AUDIO, AUDIO_PAN_EFFECT);
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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(Clip* c) {
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PanEffect* p = new PanEffect(c);
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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::load(QXmlStreamReader *stream) {
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while (!(stream->isEndElement() && stream->name() == "effect") && !stream->atEnd()) {
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stream->readNext();
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if (stream->isStartElement() && stream->name() == "pan") {
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stream->readNext();
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pan_val->setValue(stream->text().toInt());
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}
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}
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}
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void PanEffect::save(QXmlStreamWriter *stream) {
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stream->writeTextElement("pan", QString::number(pan_val->value()));
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}
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void PanEffect::process_audio(quint8 *samples, int nb_bytes) {
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for (int i=0;i<nb_bytes;i+=4) {
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qint16 left_sample = (qint16) ((samples[i+1] << 8) | samples[i]);
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qint16 right_sample = (qint16) ((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-std::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] = (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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