49 lines
1.4 KiB
C++
49 lines
1.4 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(tr("Volume"));
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volume_val = volume_row->add_field(EFFECT_FIELD_DOUBLE, "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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}
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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+=4) {
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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 right_samp = (qint16) (((samples[i+3] & 0xFF) << 8) | (samples[i+2] & 0xFF));
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qint32 left_samp = (qint16) (((samples[i+1] & 0xFF) << 8) | (samples[i] & 0xFF));
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left_samp *= vol_val;
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right_samp *= vol_val;
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if (left_samp > INT16_MAX) {
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left_samp = INT16_MAX;
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} else if (left_samp < INT16_MIN) {
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left_samp = INT16_MIN;
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}
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if (right_samp > INT16_MAX) {
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right_samp = INT16_MAX;
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} else if (right_samp < INT16_MIN) {
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right_samp = INT16_MIN;
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}
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samples[i+3] = (quint8) (right_samp >> 8);
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samples[i+2] = (quint8) right_samp;
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samples[i+1] = (quint8) (left_samp >> 8);
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samples[i] = (quint8) left_samp;
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}
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}
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