sgstream/main.lua

local rate,bits = 44100,16
local chunk = 1/4
local look = 1/4
local chunkc = 2
local sour,pos
local emsnd = require("soundgen")
	.silence(0)
	:clamp(0,chunk)
	:compile(rate,bits)
local chunkd = {}
local function samplify(snd)
	local chunk = {}
	for i=0,snd:getSampleCount()-1 do
		chunk[i] = snd:getSample(i,1)
	end
	chunkd[#chunkd+1] = chunk
	return snd
end
local sndc = love.thread.getChannel("snd")
local ctrl = love.thread.getChannel("ctrl")
local function push(c,v)
	ctrl:supply(c)
	ctrl:push(v)
end
local offset = 0
local function init()
	sour = love.audio.newQueueableSource(rate,bits,1,chunkc)
	pos = 0
	chunkd={}
	for n=1,chunkc*2 do
		samplify(emsnd)
	end
	push("chunk",chunk)
	push("emsnd",emsnd)
	push("pos",pos)
	push("look",look)
	push("rate",rate)
	push("bits",bits)
	while offset>0 do
		local c = sndc:demand()
		local v = sndc:demand()
		if c == "snd" then
			offset=offset-1
		end
	end
end
local playing=false
function love.load()
	love.thread.newThread("thread.lua"):start()
	init()
	sour:play()
end
function love.keypressed(key)
	if key == "r" then
		sour:pause()
		sour:stop()
		init()
	elseif key == "space" then
		playing = not playing
		if playing then
			sour:play()
		else
			sour:pause()
		end
	end
end
local lastc = love.timer.getTime()
local waitingc = false
function love.update(dt)
	local tt = love.timer.getTime()
	for n=1,sour:getFreeBufferCount()-offset do
		push("snd",true)
		offset=offset+1
		table.remove(chunkd,1)
	end
	local tt1 = love.timer.getTime()
	if tt1-lastc >= chunk*1.2 and not waitingc then
		waitingc = true
		push("slook",true)
	end
	local tt2 = love.timer.getTime()
	while sndc:getCount()>0 do
		local c = sndc:demand()
		local v = sndc:demand()
		if c == "snd" then
			sour:queue(samplify(v))
			if playing then sour:play() end
			offset=offset-1
		elseif c == "pos" then
			pos = v
		elseif c == "look" then
			look = v
			lastc = love.timer.getTime()
			waitingc = false
		else
			error("unkc: "..tostring(c))
		end
	end
	local tt3 = love.timer.getTime()
	if tt3-tt > 0.01 then
		print("EE",tt3-tt)
		print(" 1",tt1-tt)
		print(" 2",tt2-tt1)
		print(" 3",tt3-tt2)
	end
end
function love.draw()
	local w,h = love.graphics.getDimensions()
	local line = {}
	local sx = math.floor(((chunkc+sour:getFreeBufferCount()-offset)*chunk+sour:tell())*rate)
	local rr = emsnd:getSampleCount()
	for t=0,w do
		local x = t/w
		x=x*2-1
		x=x*rate*look
		x=sx+x
		line[#line+1]=t
		x=math.floor(x+.5)
		local si,ii = math.floor(x/rr)+1,x%rr
		line[#line+1]=(((chunkd[si]or{})[ii]or 0)*0.5+0.5)*h
	end
	love.graphics.setColor(1,1,1,0.1)
	love.graphics.line(w/2,0,w/2,h)
	love.graphics.setColor(1,1,1)
	love.graphics.line(line)
end