From 8702ff2189665b473918ed60f34b6be4010a06f7 Mon Sep 17 00:00:00 2001
From: R <@gmail.com>
Date: Sun, 23 Feb 2020 00:07:51 +0000
Subject: [PATCH] Add support for Lua DSP scripts with multiple MIDI outputs

---
 libs/ardour/luaproc.cc | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/libs/ardour/luaproc.cc b/libs/ardour/luaproc.cc
index bbde673299..ab20bdf251 100644
--- a/libs/ardour/luaproc.cc
+++ b/libs/ardour/luaproc.cc
@@ -725,12 +725,15 @@ LuaProc::connect_and_run (BufferSet& bufs,
 
 			// copy back midi events
 			if (_has_midi_output && lua_midi_sink_tbl.isTable ()) {
-				bool valid;
-				const uint32_t idx = out.get(DataType::MIDI, 0, &valid);
-				if (valid && bufs.count().n_midi() > idx) {
-					MidiBuffer& mbuf = bufs.get_midi(idx);
-					mbuf.silence(0, 0);
-					for (luabridge::Iterator i (lua_midi_sink_tbl); !i.isNil (); ++i) {
+				uint32_t count = 0;
+				uint32_t idx;
+				for (luabridge::Iterator i (lua_midi_sink_tbl); !i.isNil (); ++i) {
+					bool iter_is_valid;
+					idx = out.get(DataType::MIDI, count, &iter_is_valid);
+					count++;
+					if (iter_is_valid && bufs.count().n_midi() > idx) {
+						MidiBuffer& mbuf = bufs.get_midi(idx);
+						mbuf.silence(0, 0);
 						if (!i.key ().isNumber ()) { continue; }
 						if (!i.value ()["time"].isNumber ()) { continue; }
 						if (!i.value ()["data"].isTable ()) { continue; }