#include "volumeeffect.h"

#include <QGridLayout>
#include <QLabel>
#include <QtMath>
#include <QDebug>
#include <stdint.h>

#include "ui/labelslider.h"
#include "ui/collapsiblewidget.h"

VolumeEffect::VolumeEffect(Clip* c) : Effect(c, EFFECT_TYPE_AUDIO, AUDIO_VOLUME_EFFECT) {
	EffectRow* volume_row = add_row("Volume:");
	volume_val = volume_row->add_field(EFFECT_FIELD_DOUBLE);
	volume_val->set_double_minimum_value(0);
	volume_val->set_double_maximum_value(400);

	// set defaults
	volume_val->set_double_default_value(100);

	connect(volume_val, SIGNAL(changed()), this, SLOT(field_changed()));
}

void VolumeEffect::process_audio(quint8* samples, int nb_bytes) {
	double vol_val = volume_val->get_double_value(-1);
	if (vol_val != 100) {
        for (int i=0;i<nb_bytes;i+=2) {
            qint32 samp = (qint16) (((samples[i+1] & 0xFF) << 8) | (samples[i] & 0xFF));
			double val = qPow(vol_val*0.01, 3);
            samp *= val;
            if (samp > INT16_MAX) {
                samp = INT16_MAX;
            } else if (samp < INT16_MIN) {
                samp = INT16_MIN;
            }

            samples[i+1] = (quint8) (samp >> 8);
            samples[i] = (quint8) samp;
        }
    }
}