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ardour {
["type"] = "dsp",
name = "a-MIDI Monitor",
category = "Visualization",
license = "GPLv2",
author = "Ardour Team",
description = [[Display recent MIDI events inline in the mixer strip]]
}
local maxevents = 20
local ringsize = maxevents * 3
local evlen = 3
local hpadding, vpadding = 4, 2
function dsp_ioconfig ()
return { { midi_in = 1, midi_out = 1, audio_in = -1, audio_out = -1}, }
end
function dsp_params ()
return
{
{ ["type"] = "input",
name = "Font size",
doc = "Text size used by the monitor to display midi events",
min = 4, max = 12, default = 7, integer = true },
{ ["type"] = "input",
name = "Line count",
doc = "How many events will be shown at most",
min = 1, max = maxevents, default = 6, integer = true },
{ ["type"] = "input",
name = "Hexadecimal",
doc = "If enabled, values will be printed in hexadecimal notation",
min = 0, max = 1, default = 0, toggled = true },
{ ["type"] = "input",
name = "System messages",
doc = "If enabled, the monitor will show System Control and Real-Time messages",
min = 0, max = 1, default = 0, toggled = true },
{ ["type"] = "input",
name = "Numeric Notes",
doc = "If enabled, note-events displayed numerically",
min = 0, max = 1, default = 0, toggled = true },
}
end
function dsp_init (rate)
-- create a shmem space to hold latest midi events
-- a int representing the index of the last event, and
-- a C-table as storage for events.
self:shmem():allocate(1 + ringsize*evlen)
self:shmem():atomic_set_int(0, 1)
local buffer = self:shmem():to_int(1):array()
for i = 1, ringsize*evlen do
buffer[i] = -1 -- sentinel for empty slot
end
end
function dsp_runmap (bufs, in_map, out_map, n_samples, offset)
local pos = self:shmem():atomic_get_int(0)
local buffer = self:shmem():to_int(1):array()
-- passthrough all data
ARDOUR.DSP.process_map (bufs, in_map, out_map, n_samples, offset, ARDOUR.DataType ("audio"))
ARDOUR.DSP.process_map (bufs, in_map, out_map, n_samples, offset, ARDOUR.DataType ("midi"))
-- then fill the event buffer
local ib = in_map:get (ARDOUR.DataType ("midi"), 0) -- index of 1st midi input
if ib ~= ARDOUR.ChanMapping.Invalid then
local events = bufs:get_midi (ib):table () -- copy event list into a lua table
-- iterate over all MIDI events
for _, e in pairs (events) do
local ev = e:buffer():array()
pos = pos % ringsize + 1
-- copy the data
for j = 1, math.min(e:size(),evlen) do
buffer[(pos-1)*evlen + j] = ev[j]
end
-- zero unused slots
for j = e:size()+1, evlen do
buffer[(pos-1)*evlen + j] = 0
end
end
end
self:shmem():atomic_set_int(0, pos)
self:queue_draw ()
end
local txt = nil -- a pango context
local cursize = 0
local hex = nil
local format_note = nil
local show_scm = nil
function format_note_name(b)
return string.format ("%5s", ARDOUR.ParameterDescriptor.midi_note_name (b))
end
function format_note_num(b)
return string.format (hex, b)
end
function show_midi(ctx, x, y, buffer, event)
local base = (event - 1) * evlen
if buffer[base+1] == -1 then return false end
local evtype = buffer[base + 1] >> 4
local channel = (buffer[base + 1] & 15) + 1 -- for System Common Messages this has no use
if evtype == 8 then
txt:set_text(string.format("%02u \u{2669}Off%s" .. hex, channel, format_note(buffer[base+2]), buffer[base+3]))
elseif evtype == 9 then
txt:set_text(string.format("%02u \u{2669}On %s" .. hex, channel, format_note(buffer[base+2]), buffer[base+3]))
elseif evtype == 10 then
txt:set_text(string.format("%02u \u{2669}KP %s" .. hex, channel, format_note(buffer[base+2]), buffer[base+3]))
elseif evtype == 11 then
txt:set_text(string.format("%02u CC " .. hex .. hex, channel, buffer[base+2], buffer[base+3]))
elseif evtype == 12 then
txt:set_text(string.format("%02u PRG " .. hex, channel, buffer[base+2]))
elseif evtype == 13 then
txt:set_text(string.format("%02u KP " .. hex, channel, buffer[base+2]))
elseif evtype == 14 then
txt:set_text(string.format("%02u PBnd" .. hex, channel, buffer[base+2] | buffer[base+3] << 7))
elseif show_scm > 0 then -- System Common Message
local message = buffer[base + 1] & 15
if message == 0 then
txt:set_text("-- SysEx")
elseif message == 1 then
txt:set_text(string.format("-- Time Code" .. hex, buffer[base+2]))
elseif message == 2 then
txt:set_text(string.format("-- Song Pos" .. hex, buffer[base+2] | buffer[base+3] << 7))
elseif message == 3 then
txt:set_text(string.format("-- Select Song" .. hex, buffer[base+2]))
elseif message == 6 then
txt:set_text("-- Tune Rq")
elseif message == 8 then
txt:set_text("-- Timing")
elseif message == 10 then
txt:set_text("-- Start")
elseif message == 11 then
txt:set_text("-- Continue")
elseif message == 12 then
txt:set_text("-- Stop")
elseif message == 14 then
txt:set_text("-- Active")
elseif message == 15 then
txt:set_text("-- Reset")
else
return false
end
else
return false
end
ctx:move_to (x, y)
txt:show_in_cairo_context (ctx)
return true
end
function render_inline (ctx, displaywidth, max_h)
local ctrl = CtrlPorts:array ()
local pos = self:shmem():atomic_get_int(0)
local buffer = self:shmem():to_int(1):array()
local count = ctrl[2]
if not txt or cursize ~= ctrl[1] then
cursize = math.floor(ctrl[1])
txt = Cairo.PangoLayout (ctx, "Mono " .. cursize)
end
if ctrl[3] > 0 then hex = " %02X" else hex = " %3u" end
show_scm = ctrl[4]
if ctrl[5] > 0 then
format_note = format_note_num
else
format_note = format_note_name
end
-- compute the size of the display
txt:set_text("0")
local _, lineheight = txt:get_pixel_size()
local displayheight = math.min(vpadding + (lineheight + vpadding) * count, max_h)
-- compute starting position (pango anchors text at north-west corner)
local x, y = hpadding, displayheight - lineheight - vpadding
-- clear background
ctx:rectangle (0, 0, displaywidth, displayheight)
ctx:set_source_rgba (.2, .2, .2, 1.0)
ctx:fill ()
-- color of latest event
ctx:set_source_rgba (1.0, 1.0, 1.0, 1.0)
-- print events
for i = pos, 1, -1 do
if y < 0 then break end
if show_midi(ctx, x, y, buffer, i) then
y = y - lineheight - vpadding
ctx:set_source_rgba (.8, .8, .8, 1.0)
end
end
for i = ringsize, pos+1, -1 do
if y < 0 then break end
if show_midi(ctx, x, y, buffer, i) then
y = y - lineheight - vpadding
ctx:set_source_rgba (.8, .8, .8, 1.0)
end
end
return {displaywidth, displayheight}
end
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