nicer effects panel, improved split selection

effects/linearfadetransition.cpp

@@ -0,0 +1,26 @@
+#include "transition.h"
+
+LinearFadeTransition::LinearFadeTransition() : Transition(AUDIO_LINEAR_FADE_TRANSITION) {}
+
+void LinearFadeTransition::process_audio(double range_start, double range_end, quint8* samples, int nb_samples, bool reverse) {
+	double interval = (range_end - range_start) / nb_samples;
+
+	for (int i=0;i<nb_samples;i+=2) {
+		qint16 samp = (qint16) (((samples[i+1] & 0xFF) << 8) | (samples[i] & 0xFF));
+
+		if (reverse) {
+			samp *= 1 - (range_start + (interval * i));
+		} else {
+			samp *= range_start + (interval * i);
+		}
+
+		samples[i+1] = (quint8) (samp >> 8);
+		samples[i] = (quint8) samp;
+	}
+}
+
+Transition* LinearFadeTransition::copy() {
+	Transition* t = new LinearFadeTransition();
+	t->length = length;
+	return t;
+}