audio viz: waves node

1 files changed, 33 insertions, 5 deletions

diff --git a/rotord/src/nodes_drawing.h b/rotord/src/nodes_drawing.h
index d6b7abe..3c26c9f 100644
--- a/rotord/src/nodes_drawing.h
+++ b/rotord/src/nodes_drawing.h
@@ -113,7 +113,31 @@ namespace Rotor {
 		private:
 			Colour colour;
 	};
-	class Waves: public Draw_node {
+	class Audio_viz: public Draw_node {
+		public:
+			Audio_viz(){}
+			Audio_viz(map<string,string> &settings):Audio_viz() {
+				base_settings(settings);
+			};
+			~Audio_viz(){};
+			Audio_viz* clone(map<string,string> &_settings) { return new Audio_viz(_settings);};
+			void vector_output(cairo_t * cr,const Frame_spec &frame){
+				if (audioactive){
+					if (!frame.audio){
+						cerr<<"Audio_viz: audio not found"<<endl;
+						audioactive=false;
+					}
+				}
+				if (frame.audio){
+					vector_audio_output(cr,frame);
+					audioactive=true;
+				}
+			}
+			virtual void vector_audio_output(cairo_t * cr,const Frame_spec &frame){};
+		private:
+			bool audioactive;
+	};
+	class Waves: public Audio_viz {
 		public:
 			Waves(){
 				title="Waves";
@@ -124,11 +148,15 @@ namespace Rotor {
 			};
 			~Waves(){};
 			Waves* clone(map<string,string> &_settings) { return new Waves(_settings);};
-			void vector_output(cairo_t * cr,const Frame_spec &frame){
-				if (frame.audio){
-
+			void vector_audio_output(cairo_t * cr,const Frame_spec &frame){
+				cairo_set_source_rgb(cr, 1.0,1.0,1.0);
+				cairo_save(cr); //not really even necessary?
+				cairo_translate(cr, 0, frame.h/2);
+				for (int i=0;i<frame.w;i++){
+					cairo_line_to(cr,i,(((int16_t)frame.audio->samples[i*frame.audio->channels])*frame.h)>>16);
 				}
-				else cerr<<"error: visualisation audio not found"<<endl;
+				cairo_restore (cr); //not really even necessary?
+				cairo_stroke(cr);
 			}
 		private:
 	};