added backend for disabling clips

playback/playback.cpp

@@ -287,7 +287,7 @@ void retrieve_next_frame_raw_data(Clip* c, AVFrame* output) {
 }
 
 bool is_clip_active(Clip* c, long playhead) {
-	return c->timeline_in < playhead + ceil(c->sequence->frame_rate) && c->timeline_out > playhead;
+    return c->timeline_in < playhead + ceil(c->sequence->frame_rate) && c->timeline_out > playhead && c->enabled;
 }
 
 void set_sequence(Sequence* s) {

project/clip.cpp

@@ -18,6 +18,7 @@ Clip::Clip() {
 Clip* Clip::copy() {
     Clip* copy = new Clip();
 
+    copy->enabled = enabled;
     copy->name = QString(name);
     copy->clip_in = clip_in;
     copy->timeline_in = timeline_in;
@@ -39,6 +40,7 @@ Clip* Clip::copy() {
 
 void Clip::init() {
 	reset();
+    enabled = true;
     clip_in = 0;
     timeline_in = 0;
     timeline_out = 0;

project/clip.h

@@ -39,6 +39,7 @@ struct Clip
 	bool undeletable;
 
 	// timeline variables
+    bool enabled;
 	QString name;
 	long clip_in;
 	long timeline_in;