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Clarify documentation of Lua inter-processor communication

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This commit is contained in:
Robin Gareus 2016-10-12 20:08:39 +02:00
parent 0b51d760ad
commit e4edd8e602
1 changed files with 10 additions and 3 deletions
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13
scripts/_dsp_plugin_communication.lua
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@ -21,9 +21,10 @@ function dsp_run (ins, outs, n_samples)
local route = self:route () local route = self:route ()
local shmem = self:shmem () local shmem = self:shmem ()
-- count plugins
local i = 0; local i = 0;
local l = 0; local l = 0;
local s = -1; local s = -1; -- 'self' this plugin instance
-- iterate overall plugins on this track, -- iterate overall plugins on this track,
-- find all LuaProc instances of this plugin (unique_id), -- find all LuaProc instances of this plugin (unique_id),
@ -33,12 +34,16 @@ function dsp_run (ins, outs, n_samples)
and not proc:to_insert():plugin (0):to_luaproc():isnil () and not proc:to_insert():plugin (0):to_luaproc():isnil ()
and proc:to_insert():plugin (0):unique_id () == self:unique_id () then 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 if (self:id ():to_s() == proc:to_insert():plugin (0):id ():to_s()) then
s = l; -- this plugin instance s = l; -- *this* plugin instance
end end
if l == 0 then 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 () shmem = proc:to_insert():plugin (0):to_luaproc():shmem ()
end end
l = l + 1 -- count total instances of this plugin l = l + 1 -- count total instances of this plugin-type
end end
i = i + 1 i = i + 1
until proc:isnil () until proc:isnil ()
@ -55,6 +60,8 @@ function dsp_run (ins, outs, n_samples)
peak = ARDOUR.DSP.compute_peak(outs[c], n_samples, peak) peak = ARDOUR.DSP.compute_peak(outs[c], n_samples, peak)
end end
-- actual inter-plugin communication
local a = shmem:to_float (0):array () local a = shmem:to_float (0):array ()
if s == 0 then if s == 0 then
-- the first plugin saves the peak -- the first plugin saves the peak