79 lines
2.0 KiB
Lua
79 lines
2.0 KiB
Lua
ardour { ["type"] = "dsp", name = "DSP Plugin Communication" }
|
|
function dsp_ioconfig () return { { audio_in = -1, audio_out = -1} } end
|
|
|
|
function dsp_init (rate)
|
|
self:shmem ():allocate (1)
|
|
end
|
|
|
|
function dsp_configure (ins, outs)
|
|
end
|
|
|
|
function dsp_params ()
|
|
return
|
|
{
|
|
{ ["type"] = "output", name = "self", min = 0, max = 8},
|
|
{ ["type"] = "output", name = "gain", min = 0, max = 2},
|
|
}
|
|
end
|
|
|
|
function dsp_run (ins, outs, n_samples)
|
|
local ctrl = CtrlPorts:array ()
|
|
local route = self:route ()
|
|
local shmem = self:shmem ()
|
|
|
|
-- count plugins
|
|
local i = 0;
|
|
local l = 0;
|
|
local s = -1; -- 'self' this plugin instance
|
|
|
|
-- iterate overall plugins on this track,
|
|
-- find all LuaProc instances of this plugin (unique_id),
|
|
repeat
|
|
local proc = route:nth_plugin (i)
|
|
if not proc:isnil ()
|
|
and not proc:to_insert():plugin (0):to_luaproc():isnil ()
|
|
and proc:to_insert():plugin (0):unique_id () == self:unique_id () then
|
|
if (self:id ():to_s() == proc:to_insert():plugin (0):id ():to_s()) then
|
|
s = l; -- *this* plugin instance
|
|
end
|
|
if l == 0 then
|
|
-- use shared-memory are of the first plugin instance for all.
|
|
--
|
|
-- (the first plugin writes there, all later plugins only read,
|
|
-- plugins on a track are executed in order, in the same thread)
|
|
shmem = proc:to_insert():plugin (0):to_luaproc():shmem ()
|
|
end
|
|
l = l + 1 -- count total instances of this plugin-type
|
|
end
|
|
i = i + 1
|
|
until proc:isnil ()
|
|
|
|
assert (s >= 0)
|
|
ctrl[1] = s;
|
|
|
|
-- calculate digital peak of all channels
|
|
local peak = 0
|
|
for c = 1,#ins do
|
|
if not ins[c]:sameinstance (outs[c]) then
|
|
ARDOUR.DSP.copy_vector (outs[c], ins[c], n_samples)
|
|
end
|
|
peak = ARDOUR.DSP.compute_peak(outs[c], n_samples, peak)
|
|
end
|
|
|
|
|
|
-- actual inter-plugin communication
|
|
local a = shmem:to_float (0):array ()
|
|
if s == 0 then
|
|
-- the first plugin saves the peak
|
|
a[0] = peak
|
|
ctrl[2] = -1
|
|
else
|
|
-- all later plugins display the difference to the first.
|
|
if (a[0] == 0) then
|
|
ctrl[2] = 1
|
|
else
|
|
ctrl[2] = peak / a[0]
|
|
end
|
|
end
|
|
end
|