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--- projetos:musichacking:inicio [2018/02/17 16:29]
phil [Próximo Encontro]
+++ projetos:musichacking:inicio [2018/07/11 01:46]
phil [Encontros Passados]
@@ Linha 37: / Linha 37: @@
-===== Encontros Passados =====
+Codigo pra notas randomicos :
+<code>
+--[[
+name: croissant
+description: MIDI processor VST/AU for Protoplug.
+I'm going to create a library that emulates the functionality I use from Sonic-Pi for generative / algorithmic music.
+Starting with the ring (cyclic array) data-structure.
+author: [email protected]
+--]]
+require "include/protoplug"
+local blockEvents = {}
+function ring(ns)
+	local count = 0
+	for _ in pairs(ns) do count = count + 1 end
+	return {
+		notes = ns,
+		noItems = count,
+		current = 0,
+		choose = function(self)
+			r = math.random(self.noItems)
+			x = self.notes[r]
+			return x
+		end,
+		tick = function(self)
+			if (self.current > self.noItems-1) then
+				self.current = 0
+			end
+			self.current = self.current + 1
+			return self.notes[self.current]
+		end
+	}
+end
+local scale = ring({0, 3, 7, 11, 12, 17})
+local off_buffer = {}
+function plugin.processBlock(samples, smax, midiBuf)
+	blockEvents = {}
+	for ev in midiBuf:eachEvent() do
+		if ev:isNoteOn() then
+			local root = ev:getNote()
+			local note = root + scale:choose()
+			off_buffer[root] = note
+			play(ev:getChannel(),note,ev:getVel())
+		elseif ev:isNoteOff() then
+			local note = off_buffer[ev:getNote()]
+			if not note == nil then
+				play_off(ev:getChannel(),note)
+			end
+		end
+	end
+	-- fill midi buffer with prepared notes
+	midiBuf:clear()
+	if #blockEvents>0 then
+		for _,e in ipairs(blockEvents) do
+			midiBuf:addEvent(e)
+		end
+	end
+end
+function play(chan,note,vel)
+	local newEv = midi.Event.noteOn(chan,note,vel)
+	table.insert(blockEvents, newEv)
+end
+function play_off(chan,note)
+	local newEv = midi.Event.noteOff(chan,note)
+	table.insert(blockEvents, newEv)
+end
+</code>
 === MusicHacking #24 : web_audio ===

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