39 lines
1.2 KiB
C++
39 lines
1.2 KiB
C++
#include "volumeeffect.h"
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#include <QGridLayout>
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#include <QLabel>
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#include <QtMath>
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#include <stdint.h>
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#include "ui/labelslider.h"
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#include "ui/collapsiblewidget.h"
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VolumeEffect::VolumeEffect(Clip* c, const EffectMeta *em) : Effect(c, em) {
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EffectRow* volume_row = add_row("Volume:");
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volume_val = volume_row->add_field(EFFECT_FIELD_DOUBLE);
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volume_val->id = "volume";
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volume_val->set_double_minimum_value(0);
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// set defaults
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volume_val->set_double_default_value(100);
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connect(volume_val, SIGNAL(changed()), this, SLOT(field_changed()));
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}
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void VolumeEffect::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+=2) {
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double vol_val = log_volume(volume_val->get_double_value(timecode_start+(interval*i), true)*0.01);
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qint32 samp = (qint16) (((samples[i+1] & 0xFF) << 8) | (samples[i] & 0xFF));
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samp *= vol_val;
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if (samp > INT16_MAX) {
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samp = INT16_MAX;
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} else if (samp < INT16_MIN) {
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samp = INT16_MIN;
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}
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samples[i+1] = (quint8) (samp >> 8);
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samples[i] = (quint8) samp;
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}
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}
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