From: Robin Gareus <robin@gareus.org>
Date: Tue, 5 Dec 2017 15:09:19 +0000 (+0100)
Subject: Add example Lua script to send raw MIDI (sysex) from file
X-Git-Url: https://git.carlh.net/gitweb/?a=commitdiff_plain;h=c0f34653049d255640f76484dfa50700629ad90d;p=ardour.git

Add example Lua script to send raw MIDI (sysex) from file
---

diff --git a/scripts/_tx_raw_midi_from_file.lua b/scripts/_tx_raw_midi_from_file.lua
new file mode 100644
index 0000000000..36cbdc1a39
--- /dev/null
+++ b/scripts/_tx_raw_midi_from_file.lua
@@ -0,0 +1,110 @@
+ardour {
+	["type"]    = "EditorAction",
+	name        = "Send Raw MIDI from File",
+	license     = "MIT",
+	author      = "Ardour Team",
+	description = [[Read raw binary midi (.syx) from file and send it to a control port]]
+}
+
+function factory () return function ()
+
+	function portlist ()
+		local rv = {}
+		local a = Session:engine()
+		local _, t = a:get_ports (ARDOUR.DataType("midi"), ARDOUR.PortList())
+		for p in t[2]:iter() do
+			local amp = p:to_asyncmidiport ()
+			if amp:isnil() or not amp:sends_output() then goto continue end
+			rv[amp:name()] = amp
+			print (amp:name(), amp:sends_output())
+			::continue::
+		end
+		return rv
+	end
+
+	local dialog_options = {
+		{ type = "file", key = "file", title = "Select .syx MIDI file" },
+		{ type = "dropdown", key = "port", title = "Target Port", values = portlist () }
+	}
+
+	local rv = LuaDialog.Dialog ("Select Taget", dialog_options):run ()
+	dialog_options = nil -- drop references (ports, shared ptr)
+	collectgarbage () -- and release the references immediately
+
+	if not rv then return end -- user cancelled
+
+	local f = io.open (rv["file"], "rb")
+
+	if not f then
+		LuaDialog.Message ("Raw MIDI Tx", "File Not Found", LuaDialog.MessageType.Error, LuaDialog.ButtonType.Close):run ()
+		goto out
+	end
+
+	do  -- scope for 'local'
+		local size = f:seek("end") -- determine file size
+		f:seek("set", 0)
+
+		if size > 1048576 then
+			local ok = LuaDialog.Message ("Raw MIDI Tx",
+				string.format ("File is larger than 1MB.\nFile-size = %.1f kB\n\nContinue?", size / 1024),
+				LuaDialog.MessageType.Question, LuaDialog.ButtonType.Yes_No):run ()
+			if ok ~= LuaDialog.Response.Yes then
+				f:close ()
+				goto out
+			end
+		end
+	end
+
+	do -- scope for 'local'
+		local midi_byte_count = 0
+		local total_read = 0
+		local message_count = 0
+		local long_message = false
+
+		local async_midi_port = rv["port"] -- reference to port
+		local parser = ARDOUR.RawMidiParser () -- construct a MIDI parser
+
+		while true do
+			-- read file in 64byte chunks
+			local bytes = f:read (64)
+			if not bytes then break end
+			total_read = total_read + #bytes
+
+			-- parse MIDI data byte-by-byte
+			for i = 1, #bytes do
+				if parser:process_byte (bytes:byte (i)) then
+					if parser:buffer_size () > 127 then
+						long_message = true
+						print ("WARNING -- single large message > 127, bytes: ", parser:buffer_size ())
+					end
+					-- parsed complete normalized MIDI message, send it
+					async_midi_port:write (parser:midi_buffer (), parser:buffer_size (), 0)
+
+					-- Physical MIDI is sent at 31.25kBaud.
+					-- Every message is sent as 10bit message on the wire,
+					-- so every MIDI byte needs 320usec.
+					ARDOUR.LuaAPI.usleep (400 * parser:buffer_size ())
+
+					-- count msgs and valid bytes sent
+					midi_byte_count = midi_byte_count + parser:buffer_size ()
+					message_count = message_count + 1
+					if 0 == message_count % 50 then
+						-- print() wakes up the GUI, prevent stalling the event loop
+						print ("Sent", message_count, "messages, bytes so far: ", midi_byte_count)
+					end
+				end
+			end
+		end
+
+		f:close ()
+		print ("Sent", message_count, "messages, total bytes: ", midi_byte_count, "/", total_read)
+
+		if long_message then
+			LuaDialog.Message ("Raw MIDI Tx", "Dataset contained messages longer than 127 bytes. Which may or may not have been transmitted successfully.", LuaDialog.MessageType.Warning, LuaDialog.ButtonType.Close):run ()
+		end
+	end
+
+	::out::
+	rv = nil
+	collectgarbage ()
+end end