volume

static/qrplay/v2c.html

@@ -28,15 +28,17 @@
 <p><a href=http://nycki.net/qrplay>qrplay</a></p>
 <textarea id=f></textarea><p>
 <button onclick='
-v=f.value.toLowerCase();
+s=f.value.toLowerCase();
 f.A?.close();
 A=f.A=new AudioContext;
 // time per-channel
 T=[];
 // tempo in beats per minute
 u=137;
+// volume. 50 is max, 45 is half, 40 is half again...
+v=40;
 for(
-	c=t=o=k=Z=0,l=3;C=v[c++];
+	c=t=o=k=Z=0,l=3;C=s[c++];
 	// no match
 	z<0?0:
 	// comments
@@ -45,28 +47,31 @@ for(
 	z<4?o+=12*--d:
 	// triplets and dots
 	z<6?l*=3/d:
-	// note
+	// note or rest (percussion not implemented)
-	z<13?(
+	z<23?(
 		O=new OscillatorNode(A,{
 			type:`square`,
-			detune:100*(`0x`+d-(v[c]==`!`)+(v[c]==`#`)+o-9)
+			detune:100*(d?`0x`+d-(s[c]==`!`)+(s[c]==`#`)+o-9:-9e9)
 		}),
-		G=new GainNode(A,{gain:.05}),
+		G=new GainNode(A,{gain:.5**(14-v/5)}),
 		O.connect(G),
 		G.connect(A.destination),
 		O.start(t),
 		O.stop(t+=2.5*l/u)
 	):
-	// rest, also skip percussion
-	z<23?t+=l*u:
 	// reset octave and duration
 	z<24?(o=0,l=3):
 	// set note length
 	z<31?l=3<<(z-25):
 	// change channel
-	(T[Z]=t,Z=+v.slice(c,c+=2),t=T[Z]|0)
+	z<32?(T[Z]=t,t=T[Z=s[c++]+s[c++]|0]|0):
+	// change tempo
+	z<33?u=s.slice(c,c+=3):
+	// change volume
+    v=s[c++]+s[c++]
+	// TODO combine all these slice operations into one branch
 	// d is additional data that varies with the operation.
-)d=`--0229024579b`[z=`\n;-+.3cdefgab012456789x@jtsiqhwz`.indexOf(C)]
+)d=`--0229024579b`[z=`\n;-+.3cdefgab012456789x@jtsiqhwzuv`.indexOf(C)]
 '>#play</button> <button onclick=f.A.close()>#stop</button></center>
 <!-- stop snipping here -->