Further updates to Scala to MTS script:
* allow non-realtime bulk transfers * debug mode, dump .syx file * add some comments and references
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@ -42,16 +42,35 @@ function factory () return function ()
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end
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-- calculate MIDI note-number and cent-offset for a given frequency
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--
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-- "The first byte of the frequency data word specifies the nearest equal-tempered
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-- semitone below the frequency. The next two bytes (14 bits) specify the fraction
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-- of 100 cents above the semitone at which the frequency lies."
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--
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-- 68 7F 7F = 439.9984 Hz
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-- 69 00 00 = 440.0000 Hz
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-- 69 00 01 = 440.0016 Hz
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--
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-- NB. 7F 7F 7F = no change (reserved)
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--
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function freq_to_mts (hz)
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local note = math.floor (12. * log2 (hz / 440) + 69.0)
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local freq = 440.0 * 2.0 ^ ((note - 69) / 12);
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assert (freq > note)
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local cent = 1200.0 * log2 (hz / freq)
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-- fixup rounding errors
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if cent >= 99.99 then
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note = note + 1
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cent = 0
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end
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if cent < 0 then
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cent = 0
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end
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return note, cent
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end
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local dialog_options = {
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{ type = "file", key = "file", title = "Select .scl file" },
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{ type = "checkbox", key = "bulk", default = false, title = "Bulk Transfer (not realtime)" },
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{ type = "dropdown", key = "tx", title = "MIDI SysEx Target", values = midi_targets () }
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}
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@ -115,29 +134,84 @@ function factory () return function ()
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assert (expected_len + 2 == ln)
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assert (expected_len > 0)
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-----------------------------------------------------------------------------
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-- TODO consider reading a .kbm file or make these configurable in the dialog
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-- http://www.huygens-fokker.org/scala/help.htm#mappings
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local ref_root = 60 -- middle C
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local ref_note = 69 -- A4
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local ref_freq = 440.0
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local ref_note = 69 -- Reference note for which frequency is given
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local ref_freq = 440.0 -- Frequency to tune the above note to
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local ref_root = 60 -- root-note of the scale, note where the first entry of the scale is mapped to
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local note_start = 0
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local note_end = 127
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-----------------------------------------------------------------------------
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-- prepare sending data
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local send_bulk = rv['bulk']
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local tx = rv["tx"] -- output port
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local parser = ARDOUR.RawMidiParser () -- construct a MIDI parser
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local checksum = 0
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if send_bulk then
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note_start = 0
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note_end = 127
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end
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--local dump = io.open ("/tmp/dump.syx", "wb")
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-- helper function to send MIDI
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function tx_midi (syx, len, hdr)
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for b = 1, len do
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--dump:write (string.char(syx:byte (b)))
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-- calculate checksum, xor of all payload data
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-- (excluding the 0xf0, 0xf7, and the checksum field)
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if b >= hdr then
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checksum = checksum ~ syx:byte (b)
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end
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-- parse message to C/C++ uint8_t* array (Validate message correctness. This
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-- also returns C/C++ uint8_t* array for direct use with write_immediate_event.)
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if parser:process_byte (syx:byte (b)) then
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tx:write_immediate_event (parser:buffer_size (), parser:midi_buffer ())
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-- Slow things down a bit to ensure that no messages as lost.
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-- Physical MIDI is sent at 31.25kBaud.
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-- Every message is sent as 10bit message on the wire,
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-- so every MIDI byte needs 320usec.
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ARDOUR.LuaAPI.usleep (400 * parser:buffer_size ())
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end
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end
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end
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-- show progress dialog
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local pdialog = LuaDialog.ProgressWindow ("Scala to MIDI Tuning", true)
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pdialog:progress (0, "Tuning");
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-- calculate frequency at ref_root
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local delta = ref_note - ref_root
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local delta_octv = math.floor (delta / expected_len)
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local delta_note = delta % expected_len
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-- inverse mapping, ref_note will have the specified frequency in the target scale,
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-- while the scale itself will start at ref_root
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local ref_base = ref_freq * 2 ^ ((freqtbl[delta_note + 1] + freqtbl[expected_len + 1] * delta_octv) / -1200)
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-- prepare sending data
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local tx = rv["tx"] -- output port
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local parser = ARDOUR.RawMidiParser () -- construct a MIDI parser
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if send_bulk then
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-- MIDI Tuning message
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-- http://technogems.blogspot.com/2018/07/using-midi-tuning-specification-mts.html
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-- http://www.ludovico.net/download/materiale_didattico/midi/08_midi_tuning.pdf
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local syx = string.char (
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0xf0, 0x7e, -- non-realtime sysex
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0x00, -- target-id
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0x08, 0x01, -- tuning, bulk dump reply
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0x00, -- tuning program number 0 to 127 in hexadecimal
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-- 16 chars name (zero padded)
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0x53, 0x63, 0x6C, 0x2D, 0x4D, 0x54, 0x53, 0x00, -- Scl-MTS
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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)
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tx_midi (syx, 22, 1)
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end
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-- show progress dialog
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local pdialog = LuaDialog.ProgressWindow ("Scala to MIDI Tuning", true)
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pdialog:progress (0, "Tuning");
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-- iterate over all MIDI notes
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for nn = 0, 127 do
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-- iterate over MIDI notes
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for nn = note_start, note_end do
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if pdialog:canceled () then break end
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-- calculate the note relative to kbm's ref_root
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@ -153,16 +227,39 @@ function factory () return function ()
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-- MTS uses two MIDI bytes (2^14) for cents
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local cc = math.floor (163.83 * cent + 0.5) | 0
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local cent_lsb = (cc >> 7) & 127
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local cent_msb = cc & 127
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local cent_msb = (cc >> 7) & 127
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local cent_lsb = cc & 127
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--print ("MIDI Note:", nn, "scale-note:", delta_note, "Octave:", delta_octv, "-> Freq:", fq, "= note:", base, "+", cent, "cents (", cc, ")")
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--[[
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print (string.format ("MIDI-Note %3d | Octv: %+d Note: %2d -> Freq: %8.2f Hz = note: %3d + %6.3f ct (0x%02x 0x%02x 0x%02x)",
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nn, delta_octv, delta_note, fq, base, cent, base, cent_msb, cent_lsb))
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--]]
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if (base < 0 or base > 127) then
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if send_bulk then
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if base < 0 then
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base = 0
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else
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base = 127
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end
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cent_msb = 0
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cent_lsb = 0
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else
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-- skip out of bounds MIDI notes
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goto continue
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end
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end
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if send_bulk then
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local syx = string.char (
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base, -- semitone (MIDI note number to retune to, unit is 100 cents)
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cent_msb, -- MSB of fractional part (1/128 semitone = 100/128 cents = .78125 cent units)
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cent_lsb, -- LSB of fractional part (1/16384 semitone = 100/16384 cents = .0061 cent units)
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0xf7
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)
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tx_midi (syx, 3, 0)
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else
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checksum = 0x07 -- really unused
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-- MIDI Tuning message
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-- http://www.microtonal-synthesis.com/MIDItuning.html
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local syx = string.char (
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@ -177,18 +274,7 @@ function factory () return function ()
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cent_lsb, -- LSB of fractional part (1/16384 semitone = 100/16384 cents = .0061 cent units)
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0xf7
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)
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-- parse message to C/C++ uint8_t* array (Validate message correctness. This
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-- also returns C/C++ uint8_t* array for direct use with write_immediate_event.)
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for b = 1, 12 do
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if parser:process_byte (syx:byte (b)) then
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tx:write_immediate_event (parser:buffer_size (), parser:midi_buffer ())
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-- Slow things down a bit to ensure that no messages as lost.
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-- Physical MIDI is sent at 31.25kBaud.
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-- Every message is sent as 10bit message on the wire,
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-- so every MIDI byte needs 320usec.
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ARDOUR.LuaAPI.usleep (400 * parser:buffer_size ())
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end
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tx_midi (syx, 12, 0)
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end
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-- show progress
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@ -198,9 +284,15 @@ function factory () return function ()
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::continue::
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end
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if send_bulk and not pdialog:canceled () then
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tx_midi (string.char ((checksum & 127), 0xf7), 2, 2)
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end
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-- hide modal progress dialog and destroy it
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pdialog:done ();
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--dump:close ()
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end end
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-- simple icon
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