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dalosp.limiter = {
configure = function (self)
local accept, limit = iup.GetParam(self.name .. " configuration", nil, [[
Limit: %i{The actual size this limiter is going to produce}
]], self.op or 0, self.maximize and 1 or 0)
if accept then
self.extra.limit = limit
self:input_change()
end
end,
input_change = function (self, ind)
local h = self:get_linked_input(1)
if h then
self.color = cd.GREEN
local obj = {
h = h,
offset = 0,
size = math.max(h:getsize(), self.limit),
canread = function (self) return true end,
canwrite = function (self) return false end,
canseek = function (self) return true end,
canwatch = function (self) return false end,
getname = function (self) return end,
tell = function (self) return self.offset end,
getsize = function (self) return self.size end,
getmodif = function (self) return 0 end,
flush = function (self) return true end,
seek = function (self, offset, wheel)
if wheel == SEEK_SET then
self.offset = offset
elseif wheel == SEEK_CUR then
self.offset = self.offset + offset
elseif wheel == SEEK_END then
self.offset = self.size + offset
else
error "Unknown wheel"
end
if self.offset < 0 then self.offset = 0 end
if self.offset >= self.size then self.offset = self.size end
self.h:seek(self.offset)
return self.offset
end,
read = function (self, userdata, count)
count = math.min(count, self.size - self.offset)
if count == 0 then
if self.got_eof then self.lh:close() end
self.got_eof = true
return 0
end
self.got_eof = false
local r = self.h:read(count, userdata)
self.offset = self.offset + r
return r
end,
}
local newh = HandleLua(obj)
obj.lh = newh
self:set_houtput(newh)
self.dcanvas:draw()
else
self.color = cd.YELLOW
self:set_houtput(nil)
self.dcanvas:draw()
end
end,
create = function (d, tab)
tab.ninputs = 1
tab.noutputs = 1
tab.otype = dalos.objtype.LUA_FILTER
tab.configure = dalosp.limiter.configure
tab.input_change = dalosp.limiter.input_change
tab.default_name = "Limiter"
local extra = { }
local obj = dalos.object(d, tab, extra)
end,
}
dalos.limiter = dalosp.limiter.create
dalos:register_obj("Limiter", dalos.limiter)
|
