First commit of brand new rewrite

effects/paneffect.cpp

@@ -0,0 +1,50 @@
+#include "effects/effects.h"
+
+#include <QGridLayout>
+#include <QSpinBox>
+#include <QLabel>
+
+#include "ui/collapsiblewidget.h"
+
+PanEffect::PanEffect(Clip* c) : Effect(c) {
+	container = new CollapsibleWidget();
+	container->setText(audio_effect_names[AUDIO_PAN_EFFECT]);
+
+	ui = new QWidget();
+
+	QGridLayout* ui_layout = new QGridLayout();
+
+	ui_layout->addWidget(new QLabel("Pan:"), 0, 0);
+	pan_val = new QSpinBox();
+	pan_val->setMinimum(-100);
+	pan_val->setMaximum(100);
+	ui_layout->addWidget(pan_val, 0, 1);
+
+	ui->setLayout(ui_layout);
+
+	container->setContents(ui);
+
+	// set defaults
+	pan_val->setValue(0);
+}
+
+void PanEffect::process_audio(uint8_t *samples, int nb_bytes) {
+	for (int i=0;i<nb_bytes;i+=4) {
+		int16_t left_sample = (int16_t) ((samples[i+1] << 8) | samples[i]);
+		int16_t right_sample = (int16_t) ((samples[i+3] << 8) | samples[i+2]);
+
+		float val = pan_val->value()*0.01;
+		if (val < 0) {
+			// affect right channel
+			right_sample *= (1-abs(val));
+		} else {
+			// affect left channel
+			left_sample *= (1-val);
+		}
+
+		samples[i+3] = (uint8_t) (right_sample >> 8);
+		samples[i+2] = (uint8_t) right_sample;
+		samples[i+1] = (uint8_t) (left_sample >> 8);
+		samples[i] = (uint8_t) left_sample;
+	}
+}