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MIDI.lua
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MIDI.lua
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#!/usr/bin/lua
--require 'DataDumper' -- http://lua-users.org/wiki/DataDumper
local M = {} -- public interface
M.Version = '5.9'
M.VersionDate = '20120504'
-- 20120504 5.9 add the contents of mid_opus_tracks()
-- 20111129 5.7 _encode handles empty tracks; score2stats num_notes_by_channel
-- 20111111 5.6 fix patch 45 and 46 in Number2patch, should be Pizz and Harp
-- 20110115 5.5 add mix_opus_tracks()
-- 20110126 5.4 "previous message repeated N times" to save space on stderr
-- 20110126 5.3 robustness fix if one note_on and multiple note_offs
-- 20110125 5.2 opus2score terminates unended notes at the end of the track
-- 20110124 5.1 the warnings in midi2opus display track_num
-- 20110122 5.0 sysex2midimode.get pythonism eliminated
-- 20110119 4.9 copyright_text_event "time" item was missing
-- 20110110 4.8 note_on with velocity=0 treated as a note-off
-- 20110109 4.7 many global vars localised, passes lualint :-)
-- 20110108 4.6 duplicate int2sevenbits removed, passes lualint -r
-- 20110108 4.5 related end_track bugs fixed around line 516
-- 20110108 4.4 null text_event bug fixed
-- 20101026 4.3 segment() remembers all patch_changes, not just the list values
-- 20101010 4.2 play_score() uses posix.fork if available
-- 20101009 4.2 merge_scores() moves aside conflicting channels correctly
-- 20101006 4.1 concatenate_scores() deepcopys also its 1st score
-- 20101006 4.1 segment() uses start_time and end_time named arguments
-- 20101005 4.1 timeshift() must not pad the set_tempo command
-- 20101003 4.0 pitch2note_event must be chapitch2note_event
-- 20100918 3.9 set_sequence_number supported, FWIW
-- 20100918 3.8 timeshift and segment accept named args
-- 20100913 3.7 first released version
---------------------------- private -----------------------------
local sysex2midimode = {
["\126\127\09\01\247"] = 1,
["\126\127\09\02\247"] = 0,
["\126\127\09\03\247"] = 2,
}
local previous_warning = '' -- 5.4
local previous_times = 0 -- 5.4
local function clean_up_warnings() -- 5.4
-- Call this before returning from any publicly callable function
-- whenever there's a possibility that a warning might have been printed
-- by the function, or by any private functions it might have called.
if previous_times > 1 then
io.stderr:write(' previous message repeated '
..previous_times..' times\n')
elseif previous_times > 0 then
io.stderr:write(' previous message repeated\n')
end
previous_times = 0
previous_warning = ''
end
local function warn(str)
if str == previous_warning then -- 5.4
previous_times = previous_times + 1
else
clean_up_warnings()
io.stderr:write(str,'\n')
previous_warning = str
end
end
local function die(str)
clean_up_warnings()
io.stderr:write(str,'\n')
os.exit(1)
end
local function readOnly(t) -- Programming in Lua, page 127
local proxy = {}
local mt = {
__index = t,
__newindex = function (t, k, v)
die("attempt to update a read-only table")
end
}
setmetatable(proxy, mt)
return proxy
end
local function dict(a)
local d = {}
if a == nil then return d end
for k,v in ipairs(a) do d[v] = true end
return d
end
local function sorted_keys(t)
local a = {}
for k,v in pairs(t) do a[#a+1] = k end
table.sort(a)
return a
end
local function int2byte(i)
return string.char(math.floor((i+0.5) % 256))
end
local function int2sevenbits(i)
return string.char(math.floor((i+0.5) % 128))
end
local function int2twobytes(i)
local b1 = math.floor(i/256) % 256
local b2 = i % 256
return string.char(b1,b2)
end
local function twobytes2int(s)
return 256*string.byte(string.sub(s,1)) + string.byte(string.sub(s,2))
end
local function int2fourbytes(i)
local b1 = math.floor(i/16777216) % 256
local b2 = math.floor(i/65536) % 256
local b3 = math.floor(i/256) % 256
local b4 = i % 256
return string.char(b1,b2,b3,b4)
end
local function fourbytes2int(s)
return 16777216*string.byte(string.sub(s,1)) +
65536 * string.byte(string.sub(s,2)) +
256*string.byte(string.sub(s,3)) + string.byte(string.sub(s,4))
end
local function read_14_bit(byte_a)
-- decode a 14 bit quantity from two bytes,
return string.byte(byte_a,1) + 128 * string.byte(byte_a,2)
end
local function write_14_bit(integer)
-- encode a 14 bit quantity into two bytes,
return string.char(integer % 128, math.floor(integer/128) % 128)
-- return string.char((integer/128) % 128, integer % 128)
end
local function ber_compressed_int(integer)
--[[BER compressed integer (not an ASN.1 BER, see perlpacktut for
details). Its bytes represent an unsigned integer in base 128,
most significant digit first, with as few digits as possible.
Bit eight (the high bit) is set on each byte except the last.
]]
if integer == 0 then return '\000' end
local ber = { string.char(integer % 128) }
while integer > 127 do
integer = math.floor(integer/128)
local seven_bits = integer % 128
table.insert(ber, 1, string.char(128+seven_bits))
end
return table.concat(ber)
end
local function str2ber_int(s, start)
--[[Given (a string, and a position within it), returns
(the ber_integer at that position, and the position after the ber_integer).
]]
local i = start
local integer = 0
while true do
local byte = string.byte(s, i)
integer = integer + (byte%128)
if byte < 127.5 then
return integer, i+1
end
if i >= #s then
warn('str2ber_int: no end-of-integer found')
return 0, start
end
i = i + 1
integer = integer * 128
end
end
local function some_text_event(which_kind, text)
if not which_kind then which_kind = 1 end
if not text then text = 'some_text' end
return '\255'..int2sevenbits(which_kind)..ber_compressed_int(text:len())..text
end
local function copy(t)
local new_table = {}
for k, v in pairs(t) do new_table[k] = v end
return new_table
end
local function deepcopy(object) -- http://lua-users.org/wiki/CopyTable
local lookup_table = {}
local function _copy(object)
if type(object) ~= "table" then
return object
elseif lookup_table[object] then
return lookup_table[object]
end
local new_table = {}
lookup_table[object] = new_table
for index, value in pairs(object) do
new_table[_copy(index)] = _copy(value)
end
return setmetatable(new_table, getmetatable(object))
end
return _copy(object)
end
local function _decode(trackdata, exclude, include, event_callback, exclusive_event_callback, no_eot_magic)
--[[Decodes MIDI track data into an opus-style list of events.
The options:
'exclude' is a dictionary-table of event types which will be ignored
'include' (and no exclude), makes exclude an array of all
possible events, /minus/ what include specifies
'event_callback' is a function
'exclusive_event_callback' is a function
]]
if not trackdata then trackdata= '' end
if not exclude then exclude = {} end
if not include then include = {} end
if include and not exclude then exclude = M.All_events end -- 4.6
local event_code = -1 -- used for running status
local event_count = 0
local events = {}
local i = 1 -- in Lua, i is the pointer to within the trackdata
while i < #trackdata do -- loop while there's anything to analyze
local eot = false -- when True event registrar aborts this loop 4.6,4.7
event_count = event_count + 1
local E = {} -- event; feed it to the event registrar at the end. 4.7
-- Slice off the delta time code, and analyze it
local time
time, i = str2ber_int(trackdata, i)
-- Now let's see what we can make of the command
local first_byte = string.byte(trackdata,i); i = i+1
if first_byte < 240 then -- It's a MIDI event
if first_byte % 256 > 127 then
event_code = first_byte
else
-- It wants running status; use last event_code value
i = i-1
if event_code == -1 then
warn("Running status not set; Aborting track.")
return {}
end
end
local command = math.floor(event_code / 16) * 16
local channel = event_code % 16
local parameter
local param1
local param2
if command == 246 then -- 0-byte argument
--pass
elseif command == 192 or command == 208 then -- 1-byte arg
parameter = string.byte(trackdata, i); i = i+1
else -- 2-byte argument could be BB or 14-bit
param1 = string.byte(trackdata, i); i = i+1
param2 = string.byte(trackdata, i); i = i+1
end
----------------- MIDI events -----------------------
local continue = false
if command == 128 then
if exclude['note_off'] then
continue = true
else
E = {'note_off', time, channel, param1, param2}
end
elseif command == 144 then
if exclude['note_on'] then
continue = true
else
E = {'note_on', time, channel, param1, param2}
end
elseif command == 160 then
if exclude['key_after_touch'] then
continue = true
else
E = {'key_after_touch',time,channel,param1,param2}
end
elseif command == 176 then
if exclude['control_change'] then
continue = true
else
E = {'control_change',time,channel,param1,param2}
end
elseif command == 192 then
if exclude['patch_change'] then
continue = true
else
E = {'patch_change', time, channel, parameter}
end
elseif command == 208 then
if exclude['channel_after_touch'] then
continue = true
else
E = {'channel_after_touch', time, channel, parameter}
end
elseif command == 224 then
if exclude['pitch_wheel_change'] then
continue = true
else -- the 2 param bytes are a 14-bit int
E = {'pitch_wheel_change', time, channel,
128*param2+param1-8192}
end
else
warn("Shouldn't get here; command="..tostring(command))
end
elseif first_byte == 255 then -- It's a Meta-Event!
local command = string.byte(trackdata, i); i = i+1
local length
length, i = str2ber_int(trackdata, i)
if (command == 0) then
if length == 2 then -- 3.9
E = {'set_sequence_number', time,
twobytes2int(string.sub(trackdata,i,i+1)) }
else
warn('set_sequence_number: length must be 2, not '
.. tostring(length))
E = {'set_sequence_number', time, 0}
end
-- Defined text events ------
elseif command == 1 then
E = {'text_event', time, string.sub(trackdata,i,i+length-1)}
elseif command == 2 then -- 4.9
E = {'copyright_text_event', time, string.sub(trackdata,i,i+length-1)}
elseif command == 3 then
E = {'track_name',time, string.sub(trackdata,i,i+length-1)}
elseif command == 4 then
E = {'instrument_name',time, string.sub(trackdata,i,i+length-1)}
elseif command == 5 then
E = {'lyric',time, string.sub(trackdata,i,i+length-1)}
elseif command == 6 then
E = {'marker',time, string.sub(trackdata,i,i+length-1)}
elseif command == 7 then
E = {'cue_point',time, string.sub(trackdata,i,i+length-1)}
-- Reserved but apparently unassigned text events -------------
elseif command == 8 then
E = {'text_event_08',time, string.sub(trackdata,i,i+length-1)}
elseif command == 9 then
E = {'text_event_09',time, string.sub(trackdata,i,i+length-1)}
elseif command == 10 then
E = {'text_event_0a',time, string.sub(trackdata,i,i+length-1)}
elseif command == 11 then
E = {'text_event_0b',time, string.sub(trackdata,i,i+length-1)}
elseif command == 12 then
E = {'text_event_0c',time, string.sub(trackdata,i,i+length-1)}
elseif command == 13 then
E = {'text_event_0d',time, string.sub(trackdata,i,i+length-1)}
elseif command == 14 then
E = {'text_event_0e',time, string.sub(trackdata,i,i+length-1)}
elseif command == 15 then
E = {'text_event_0f',time, string.sub(trackdata,i,i+length-1)}
-- Now the sticky events -------------------------------------
elseif command == 47 then
E = {'end_track', time}
-- The code for handling this, oddly, comes LATER,
-- in the event registrar.
elseif command == 81 then -- DTime, Microseconds/Crochet
if length ~= 3 then
warn('set_tempo event, but length='..length)
end
E = {'set_tempo', time,
string.byte(trackdata,i) * 65536
+ string.byte(trackdata,i+1) * 256
+ string.byte(trackdata,i+2)
}
elseif command == 84 then
if length ~= 5 then -- DTime, HR, MN, SE, FR, FF
warn('smpte_offset event, but length='..length)
end
E = {'smpte_offset', time,
string.byte(trackdata,i),
string.byte(trackdata,i+1),
string.byte(trackdata,i+2),
string.byte(trackdata,i+3),
string.byte(trackdata,i+4)
}
elseif command == 88 then
if length ~= 4 then -- DTime, NN, DD, CC, BB
warn('time_signature event, but length='..length)
end
E = {'time_signature', time,
string.byte(trackdata,i),
string.byte(trackdata,i+1),
string.byte(trackdata,i+2),
string.byte(trackdata,i+3)
}
elseif command == 89 then
if length ~= 2 then -- DTime, SF(signed), MI
warn('key_signature event, but length='..length)
end
local b1 = string.byte(trackdata,i)
if b1 > 127 then b1 = b1 - 256 end -- signed byte :-(
local b2 = string.byte(trackdata,i+1)
-- list(struct.unpack(">bB",trackdata[0:2]))}
E = {'key_signature', time, b1, b2 }
elseif (command == 127) then
E = {'sequencer_specific',time,
string.sub(trackdata,i,i+length-1)}
else
E = {'raw_meta_event', time, command,
string.sub(trackdata,i,i+length-1)}
--"[uninterpretable meta-event command of length length]"
-- DTime, Command, Binary Data
-- It's uninterpretable; record it as raw_data.
end
-- Pointer += length; -- Now move Pointer
i = i + length
-- Hmm... in lua, we should be using Pointer again....
-- trackdata = string.sub(trackdata, length+1)
--#####################################################################
elseif first_byte == 240 or first_byte == 247 then
-- Note that sysexes in MIDI /files/ are different than sysexes
-- in MIDI transmissions!! The vast majority of system exclusive
-- messages will just use the F0 format. For instance, the
-- transmitted message F0 43 12 00 07 F7 would be stored in a
-- MIDI file as F0 05 43 12 00 07 F7. As mentioned above, it is
-- required to include the F7 at the end so that the reader of the
-- MIDI file knows that it has read the entire message. (But the F7
-- is omitted if this is a non-final block in a multiblock sysex;
-- but the F7 (if there) is counted in the message's declared
-- length, so we don't have to think about it anyway.)
--command = trackdata.pop(0)
local length
length, i = str2ber_int(trackdata, i)
if first_byte == 240 then
-- 20091008 added ISO-8859-1 to get an 8-bit str
E = {'sysex_f0', time, string.sub(trackdata,i,i+length-1)}
else
E = {'sysex_f7', time, string.sub(trackdata,i,i+length-1)}
end
i = i + length
-- trackdata = string.sub(trackdata, length+1)
--#####################################################################
-- Now, the MIDI file spec says:
-- <track data> = <MTrk event>+
-- <MTrk event> = <delta-time> <event>
-- <event> = <MIDI event> | <sysex event> | <meta-event>
-- I know that, on the wire, <MIDI event> can include note_on,
-- note_off, and all the other 8x to Ex events, AND Fx events
-- other than F0, F7, and FF -- namely, <song position msg>,
-- <song select msg>, and <tune request>.
--
-- Whether these can occur in MIDI files is not clear specified
-- from the MIDI file spec. So, I'm going to assume that
-- they CAN, in practice, occur. I don't know whether it's
-- proper for you to actually emit these into a MIDI file.
elseif first_byte == 242 then -- DTime, Beats
-- <song position msg> ::= F2 <data pair>
E = {'song_position', time, read_14_bit(string.sub(trackdata,i))}
trackdata = string.sub(trackdata,3)
elseif first_byte == 243 then -- <song select> ::= F3 <data singlet>
-- E=['song_select', time, struct.unpack('>B',trackdata.pop(0))[0]]
E = {'song_select', time, string.byte(trackdata,i)}
-- trackdata = trackdata[1:]
trackdata = string.sub(trackdata,2)
-- DTime, Thing (what?! song number? whatever ...)
elseif first_byte == 246 then -- DTime
E = {'tune_request', time}
-- What would a tune request be doing in a MIDI /file/?
--########################################################
-- ADD MORE META-EVENTS HERE. TODO:
-- f1 -- MTC Quarter Frame Message. One data byte follows
-- the Status; it's the time code value, from 0 to 127.
-- f8 -- MIDI clock. no data.
-- fa -- MIDI start. no data.
-- fb -- MIDI continue. no data.
-- fc -- MIDI stop. no data.
-- fe -- Active sense. no data.
-- f4 f5 f9 fd -- unallocated
--[[
elseif (first_byte > 240) { -- Some unknown kinda F-series event ####
-- Here we only produce a one-byte piece of raw data.
-- But the encoder for 'raw_data' accepts any length of it.
E = [ 'raw_data', time, substr(trackdata,Pointer,1) ]
-- DTime and the Data (in this case, the one Event-byte)
++Pointer; -- itself
]]
elseif first_byte > 240 then -- Some unknown F-series event
-- Here we only produce a one-byte piece of raw data.
E = {'raw_data', time, string.byte(trackdata,i)} -- 4.6
trackdata = string.sub(trackdata,2) -- 4.6
else -- Fallthru.
warn(string.format("Aborting track. Command-byte first_byte=0x%x",first_byte)) --4.6
break
end
-- End of the big if-group
--#####################################################################
-- THE EVENT REGISTRAR...
-- warn('3: E='+str(E))
if E and E[1] == 'end_track' then
-- This is the code for exceptional handling of the EOT event.
eot = true
if not no_eot_magic then
if E[2] > 0 then -- a null text-event to carry the delta-time
E = {'text_event', E[2], ''} -- 4.4
else
E = nil -- EOT with a delta-time of 0; ignore it.
end
end
end
if E and not exclude[E[1]] then
--if ( $exclusive_event_callback ):
-- &{ $exclusive_event_callback }( @E );
--else
-- &{ $event_callback }( @E ) if $event_callback;
events[#events+1] = E
end
if eot then break end
end
-- End of the big "Event" while-block
return events
end
local function _encode(events_lol)
local no_running_status = false
local no_eot_magic = false -- 4.6
local never_add_eot = false -- 4.6
local unknown_callback = false -- 4.6
local data = {} -- what I'll store the chunks of byte-data in
-- This is so my end_track magic won't corrupt the original
local events = deepcopy(events_lol)
if not never_add_eot then -- One way or another, tack on an 'end_track'
if #events > 0 then -- 5.7
local last = events[#events] -- 4.5, 4.7
if not (last[1] == 'end_track') then -- no end_track already
if (last[1] == 'text_event' and last[3] == '') then -- 4.5,4.6
-- 0-length text event at track-end.
if no_eot_magic then
-- Exceptional case: don't mess with track-final
-- 0-length text_events; just peg on an end_track
events.append({'end_track', 0})
else
-- NORMAL CASE: replace with an end_track, leaving DTime
last[1] = 'end_track'
end
else
-- last event was neither 0-length text_event nor end_track
events[#events+1] = {'end_track', 0}
end
end
else -- an eventless track!
events = { {'end_track', 0},}
end
end
-- maybe_running_status = not no_running_status -- unused? 4.7
local last_status = -1 -- 4.7
for k,E in ipairs(events) do
-- get rid of the two pop's and increase the other E[] indices by two
if not E then break end
local event = E[1] -- 4.7
if #event < 1 then break end
local dtime = E[2] -- 4.7
-- print('event='..event..' dtime='..dtime)
local event_data = '' -- 4.7
if -- MIDI events -- eligible for running status
event == 'note_on'
or event == 'note_off'
or event == 'control_change'
or event == 'key_after_touch'
or event == 'patch_change'
or event == 'channel_after_touch'
or event == 'pitch_wheel_change' then
-- This block is where we spend most of the time. Gotta be tight.
local status = nil -- 4.7
local parameters = nil -- 4.7
if (event == 'note_off') then
status = 128 + (E[3] % 16)
parameters = int2sevenbits(E[4]%128)..int2sevenbits(E[5]%128)
elseif event == 'note_on' then
status = 144 + (E[3] % 16)
parameters = int2sevenbits(E[4]) .. int2sevenbits(E[5])
elseif event == 'key_after_touch' then
status = 160 + (E[3] % 16)
parameters = int2sevenbits(E[4]) .. int2sevenbits(E[5])
elseif event == 'control_change' then
status = 176 + (E[3] % 16)
parameters = int2sevenbits(E[4]) .. int2sevenbits(E[5])
elseif event == 'patch_change' then
status = 192 + (E[3] % 16)
parameters = int2sevenbits(E[4])
elseif event == 'channel_after_touch' then
status = 208 + (E[3] % 16)
parameters = int2sevenbits(E[4])
elseif event == 'pitch_wheel_change' then
status = 224 + (E[3] % 16)
parameters = write_14_bit(E[4] + 8192)
else
warn("BADASS FREAKOUT ERROR 31415!")
end
-- And now the encoding
data[#data+1] = ber_compressed_int(dtime)
if (status ~= last_status) or no_running_status then
data[#data+1] = int2byte(status)
end
data[#data+1] = parameters
last_status = status
-- break
else
-- Not a MIDI event.
last_status = -1
if event == 'raw_meta_event' then
event_data = some_text_event(E[3], E[4])
elseif (event == 'set_sequence_number') then -- 3.9
event_data = some_text_event(0, int2twobytes(E[3]))
-- Text Meta-events...
-- a case for a dict, I think (pjb) ...
elseif (event == 'text_event') then
event_data = some_text_event(1, E[3])
elseif (event == 'copyright_text_event') then
event_data = some_text_event(2, E[3])
elseif (event == 'track_name') then
event_data = some_text_event(3, E[3])
elseif (event == 'instrument_name') then
event_data = some_text_event(4, E[3])
elseif (event == 'lyric') then
event_data = some_text_event(5, E[3])
elseif (event == 'marker') then
event_data = some_text_event(6, E[3])
elseif (event == 'cue_point') then
event_data = some_text_event(7, E[3])
elseif (event == 'text_event_08') then
event_data = some_text_event(8, E[3])
elseif (event == 'text_event_09') then
event_data = some_text_event(9, E[3])
elseif (event == 'text_event_0a') then
event_data = some_text_event(10, E[3])
elseif (event == 'text_event_0b') then
event_data = some_text_event(11, E[3])
elseif (event == 'text_event_0c') then
event_data = some_text_event(12, E[3])
elseif (event == 'text_event_0d') then
event_data = some_text_event(13, E[3])
elseif (event == 'text_event_0e') then
event_data = some_text_event(14, E[3])
elseif (event == 'text_event_0f') then
event_data = some_text_event(15, E[3])
-- End of text meta-events
elseif (event == 'end_track') then
event_data = '\255\47\0'
elseif (event == 'set_tempo') then
--event_data = struct.pack(">BBwa*", 0xFF, 0x51, 3,
-- substr( struct.pack('>I', E[0]), 1, 3))
event_data = '\255\81\03' .. string.sub(int2fourbytes(E[3]),2)
-- XXX don't understand that ?!
elseif (event == 'smpte_offset') then
event_data = '\255\84\05' ..
string.char(E[3],E[4],E[5],E[6],E[7])
elseif (event == 'time_signature') then
event_data = '\255\88\04' .. string.char(E[3],E[4],E[5],E[6])
elseif (event == 'key_signature') then
local e3 = E[3]; if e3<0 then e3 = 256+e3 end -- signed byte
event_data = '\255\89\02' .. string.char(e3,E[4])
elseif (event == 'sequencer_specific') then
event_data = some_text_event(127, E[3])
-- End of Meta-events
-- Other Things...
elseif (event == 'sysex_f0') then
event_data =
"\240"..ber_compressed_int(string.len(E[3]))..E[3]
elseif (event == 'sysex_f7') then
event_data =
"\247"..ber_compressed_int(string.len(E[3]))..E[3]
elseif (event == 'song_position') then
event_data = "\242"..write_14_bit( E[3] )
elseif (event == 'song_select') then
event_data = "\243"..string.char(E[3])
elseif (event == 'tune_request') then
event_data = "\246"
elseif (event == 'raw_data') then
warn("_encode: raw_data event not supported")
break
-- End of Other Stuff
-- The Big Fallthru
else
if not unknown_callback then
warn("Unknown event: "..tostring(event))
end
break
end
--print "Event $event encoded part 2\n"
--if str(type(event_data)).find('str') >= 0 then
-- event_data = bytearray(event_data.encode('Latin1', 'ignore'))
--end
if event_data and (#event_data > 0) then -- how could it be empty?
-- data.append(struct.pack('>wa*', dtime, event_data))
-- print(' event_data='+str(event_data))
data[#data+1] = ber_compressed_int(dtime)
data[#data+1] = event_data
end
end
end
return table.concat(data)
end
local function consistentise_ticks(scores) -- 3.6
-- used by mix_scores, merge_scores, concatenate_scores
if #scores == 1 then return deepcopy(scores) end
local are_consistent = true
local ticks = scores[1][1]
for iscore = 2,#scores do
if scores[iscore][1] ~= ticks then
are_consistent = false
break
end
end
if are_consistent then return deepcopy(scores) end
local new_scores = {}
for ks,score in ipairs(scores) do
new_scores[ks] = M.opus2score(M.to_millisecs(M.score2opus(score)))
end
return new_scores
end
-------------------------- public ------------------------------
M.All_events = readOnly{
note_off=true, note_on=true, key_after_touch=true, control_change=true,
patch_change=true, channel_after_touch=true, pitch_wheel_change=true,
text_event=true, copyright_text_event=true, track_name=true,
instrument_name=true, lyric=true, marker=true, cue_point=true,
text_event_08=true, text_event_09=true, text_event_0a=true,
text_event_0b=true, text_event_0c=true, text_event_0d=true,
text_event_0e=true, text_event_0f=true,
end_track=true, set_tempo=true, smpte_offset=true,
time_signature=true, key_signature=true,
sequencer_specific=true, raw_meta_event=true,
sysex_f0=true, sysex_f7=true,
song_position=true, song_select=true, tune_request=true,
}
-- And three dictionaries:
M.Number2patch = readOnly{ -- General MIDI patch numbers:
[0]='Acoustic Grand',
[1]='Bright Acoustic',
[2]='Electric Grand',
[3]='Honky-Tonk',
[4]='Electric Piano 1',
[5]='Electric Piano 2',
[6]='Harpsichord',
[7]='Clav',
[8]='Celesta',
[9]='Glockenspiel',
[10]='Music Box',
[11]='Vibraphone',
[12]='Marimba',
[13]='Xylophone',
[14]='Tubular Bells',
[15]='Dulcimer',
[16]='Drawbar Organ',
[17]='Percussive Organ',
[18]='Rock Organ',
[19]='Church Organ',
[20]='Reed Organ',
[21]='Accordion',
[22]='Harmonica',
[23]='Tango Accordion',
[24]='Acoustic Guitar(nylon)',
[25]='Acoustic Guitar(steel)',
[26]='Electric Guitar(jazz)',
[27]='Electric Guitar(clean)',
[28]='Electric Guitar(muted)',
[29]='Overdriven Guitar',
[30]='Distortion Guitar',
[31]='Guitar Harmonics',
[32]='Acoustic Bass',
[33]='Electric Bass(finger)',
[34]='Electric Bass(pick)',
[35]='Fretless Bass',
[36]='Slap Bass 1',
[37]='Slap Bass 2',
[38]='Synth Bass 1',
[39]='Synth Bass 2',
[40]='Violin',
[41]='Viola',
[42]='Cello',
[43]='Contrabass',
[44]='Tremolo Strings',
[45]='Pizzicato Strings',
[46]='Orchestral Harp',
[47]='Timpani',
[48]='String Ensemble 1',
[49]='String Ensemble 2',
[50]='SynthStrings 1',
[51]='SynthStrings 2',
[52]='Choir Aahs',
[53]='Voice Oohs',
[54]='Synth Voice',
[55]='Orchestra Hit',
[56]='Trumpet',
[57]='Trombone',
[58]='Tuba',
[59]='Muted Trumpet',
[60]='French Horn',
[61]='Brass Section',
[62]='SynthBrass 1',
[63]='SynthBrass 2',
[64]='Soprano Sax',
[65]='Alto Sax',
[66]='Tenor Sax',
[67]='Baritone Sax',
[68]='Oboe',
[69]='English Horn',
[70]='Bassoon',
[71]='Clarinet',
[72]='Piccolo',
[73]='Flute',
[74]='Recorder',
[75]='Pan Flute',
[76]='Blown Bottle',
[77]='Skakuhachi',
[78]='Whistle',
[79]='Ocarina',
[80]='Lead 1 (square)',
[81]='Lead 2 (sawtooth)',
[82]='Lead 3 (calliope)',
[83]='Lead 4 (chiff)',
[84]='Lead 5 (charang)',
[85]='Lead 6 (voice)',
[86]='Lead 7 (fifths)',
[87]='Lead 8 (bass+lead)',
[88]='Pad 1 (new age)',
[89]='Pad 2 (warm)',
[90]='Pad 3 (polysynth)',
[91]='Pad 4 (choir)',
[92]='Pad 5 (bowed)',
[93]='Pad 6 (metallic)',
[94]='Pad 7 (halo)',
[95]='Pad 8 (sweep)',
[96]='FX 1 (rain)',
[97]='FX 2 (soundtrack)',
[98]='FX 3 (crystal)',
[99]='FX 4 (atmosphere)',
[100]='FX 5 (brightness)',
[101]='FX 6 (goblins)',
[102]='FX 7 (echoes)',
[103]='FX 8 (sci-fi)',
[104]='Sitar',
[105]='Banjo',
[106]='Shamisen',
[107]='Koto',
[108]='Kalimba',
[109]='Bagpipe',
[110]='Fiddle',
[111]='Shanai',
[112]='Tinkle Bell',
[113]='Agogo',
[114]='Steel Drums',
[115]='Woodblock',
[116]='Taiko Drum',
[117]='Melodic Tom',
[118]='Synth Drum',
[119]='Reverse Cymbal',
[120]='Guitar Fret Noise',
[121]='Breath Noise',
[122]='Seashore',
[123]='Bird Tweet',
[124]='Telephone Ring',
[125]='Helicopter',
[126]='Applause',
[127]='Gunshot',
}
M.Notenum2percussion = readOnly{ -- General MIDI Percussion (on Channel 9):
[35]='Acoustic Bass Drum',
[36]='Bass Drum 1',
[37]='Side Stick',
[38]='Acoustic Snare',
[39]='Hand Clap',
[40]='Electric Snare',
[41]='Low Floor Tom',
[42]='Closed Hi-Hat',
[43]='High Floor Tom',
[44]='Pedal Hi-Hat',
[45]='Low Tom',
[46]='Open Hi-Hat',
[47]='Low-Mid Tom',
[48]='Hi-Mid Tom',
[49]='Crash Cymbal 1',
[50]='High Tom',
[51]='Ride Cymbal 1',
[52]='Chinese Cymbal',
[53]='Ride Bell',
[54]='Tambourine',
[55]='Splash Cymbal',
[56]='Cowbell',
[57]='Crash Cymbal 2',
[58]='Vibraslap',
[59]='Ride Cymbal 2',
[60]='Hi Bongo',
[61]='Low Bongo',
[62]='Mute Hi Conga',
[63]='Open Hi Conga',
[64]='Low Conga',
[65]='High Timbale',
[66]='Low Timbale',
[67]='High Agogo',
[68]='Low Agogo',
[69]='Cabasa',
[70]='Maracas',
[71]='Short Whistle',
[72]='Long Whistle',
[73]='Short Guiro',
[74]='Long Guiro',
[75]='Claves',
[76]='Hi Wood Block',
[77]='Low Wood Block',
[78]='Mute Cuica',
[79]='Open Cuica',
[80]='Mute Triangle',
[81]='Open Triangle',
}
M.Event2channelindex = readOnly{ ['note']=4, ['note_off']=3, ['note_on']=3,
['key_after_touch']=3, ['control_change']=3, ['patch_change']=3,
['channel_after_touch']=3, ['pitch_wheel_change']=3,
}
function M.concatenate_scores(scores)
-- the deepcopys are needed if input_scores are refs to the same table
-- e.g. if invoked by midisox's repeat()
local input_scores = consistentise_ticks(scores) -- 3.6
local output_score = deepcopy(input_scores[1]) -- 4.2
for i = 2,#input_scores do
local input_score = input_scores[i]
local output_stats = M.score2stats(output_score)
local delta_ticks = output_stats['nticks']
for itrack = 2,#input_score do
if itrack > #output_score then -- new output track if doesn't exist
output_score[#output_score+1] = {}
end
for k,event in ipairs(input_score[itrack]) do
local new_event = copy(event)
new_event[2] = new_event[2] + delta_ticks
table.insert(output_score[itrack], new_event)
-- output_score[itrack][-1][1] += delta_ticks -- hmm...
end
end
end
return output_score
end
function M.grep(score, t)
if score == nil then return {1000,{},} end
local ticks = score[1]
local new_score = {ticks,{},}
if not t or type(t) ~= 'table' then return new_score end
local channels = dict(t)
local itrack = 2 while itrack <= #score do
new_score[itrack] = {}
for k,event in ipairs(score[itrack]) do
local channel_index = M.Event2channelindex[event[1]]
if channel_index then
if channels[event[channel_index]] then
table.insert(new_score[itrack], event)
end
else
table.insert(new_score[itrack], event)
end
end
itrack = itrack + 1