178 lines
6.8 KiB
Plaintext
178 lines
6.8 KiB
Plaintext
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midicomp v0.0.2 20070722 markc@renta.net
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A program to manipulate SMF (Standard MIDI File) files. midicomp will
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both read and write SMF files in 0 or format 1 and also read and write
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it's own plain text format. This means a SMF file can be turned into
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easily parseble text, edited with any text editor or filtered through
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any script language, and "recompiled" back into a binary SMF file.
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Originally based on mf2t/t2fm by Piet van Oostrum and others. It should
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build on any linux simply by typing "make" in the source directory.
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Changes:
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v0.0.2 20070722 Fixed gcc4+ compiler bug and exit warnings
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v0.0.1 20031129 Initial release, combined mf2t+t2fm, added getopt args
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Command line argument usage:
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-d --debug send any debug output to stderr
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-v --verbose output in columns with notes on
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-c --compile compile ascii input into SMF
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-n --note note on/off value as note|octave
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-t --time use absolute time instead of ticks
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-fN --fold=N fold sysex data at N columns
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To translate a SMF file to plain ascii format:
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midicomp some.mid # to view as plain text
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midicomp some.mid > some.asc # to create a text version
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To translate a plain ascii formatted file to SMF:
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midicomp -c some.asc some.mid # input and output filenames
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midicomp -c some.mid < some.asc # input from stdin with one arg
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midicomp some.mid | somefilter | midicomp -c some2.mid
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Format of the textfile:
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File header: Mfile <format> <ntrks> <division>
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Start of track: MTrk
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End of track: TrkEnd
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Note On: On <ch> <note> <vol>
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Note Off: Off <ch> <note> <vol>
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Poly Pressure: PoPr[PolyPr] <ch> <note> <val>
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Channel Pressure: ChPr[ChanPr] <ch> <val>
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Controller parameter: Par[Param] <ch> <con> <val>
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Pitch bend: Pb <ch> <val>
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Program change: PrCh[ProgCh] <ch> <prog>
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Sysex message: SysEx <hex>
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Arbutrary midi bytes: Arb <hex>
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Sequence nr: Seqnr <num>
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Key signature: KeySig <num> <manor>
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Tempo: Tempo <num>
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Time signature: TimeSig <num>/<num> <num> <num>
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SMPTE event: SMPTE <num> <num> <num> <num> <num>
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Meta text events: Meta <texttype> <string>
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Meta end of track: Meta TrkEnd
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Sequencer specific: SeqSpec <type> <hex>
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Misc meta events: Meta <type> <hex>
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The <> have the following meaning:
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<ch> ch=<num>
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<note> n=<noteval> [note=<noteval>]
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<vol> v=<num> [vol=<num>]
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<val> v=<num> [val=<num>]
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<con> c=<num> [con=<num>]
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<prog> p=<num> [prog=<num>]
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<manor> minor or major
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<noteval> either a <num> or A-G optionally followed by #,
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followed by <num> without intermediate spaces.
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<texttype> Text Copyright SeqName TrkName InstrName Lyric Marker Cue
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<type> a hex number of the form 0xab
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<hex> a sequence of 2-digit hex numbers (without 0x)
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separated by space
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<string> a string between double quotes (like "text").
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Misc notes:
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Channel numbers are 1-based, all other numbers are as they appear in the
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midifile.
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<division> is either a positive number (giving the time resolution in
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clicks per quarter note) or a negative number followed by a positive
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number (giving SMPTE timing).
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<format> <ntrks> <num> are decimal numbers.
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The <num> in the Pb is the real value (two midibytes combined)
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In Tempo it is a long (32 bits) value. Others are in the interval 0-127
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The SysEx sequence contains the leading F0 and the trailing F7.
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In a string certain characters are escaped:
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" and \ are escaped with a \
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a zero byte is written as \0
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CR and LF are written as \r and \n respectively
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other non-printable characters are written as \x<2 hex digits>
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When -f is given long strings and long hex sequences are folded by inserting
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\<newline><tab>. If in a string the next character would be a space or
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tab it will be escaped by \
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midicomp will accept all formats that mf2t can produce, plus a number of
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others. Input is case insensitive (except in strings) and extra tabs and
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spaces are allowed. Newlines are required but empty lines are allowed.
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Comment starts with # at the beginning of a lexical item and continues
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to the end of the line. The only other places where a # is legal are
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insides strings and as a sharp symbol in a symbolic note.
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In symbolic notes + and # are allowed for sharp, b and - for flat.
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In bar:beat:click time the : may also be /
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On input a string may also contain \t for a tab, and in a folded
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string any whitespace at the beginning of a continuation line is skipped.
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Hex sequences may be input without intervening spaces if each byte is
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given as exactly 2 hex digits.
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Hex sequences may be given where a string is required and vice versa.
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Hex numbers of the form 0xaaa and decimal numbers are equivalent.
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Also allowed as numbers are "bank numbers" of the form '123. In fact
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this is equivalent to the octal number 012 (subtract 1 from each
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digit, digits 1-8 allowed). The letters a-h may also be used for 1-8.
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The input is checked for correctness but not extensively. An
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errormessage will generally imply that the resulting midifile is illegal.
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channel number can be recognized by the regular expression /ch=/.
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note numbers by /n=/ or /note=/, program numbers by /p=/ or /prog=/.
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Meta events by /^Meta/ or /^SeqSpec/.
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Text events by /"/, continued lines by /\\$/, continuation lines by /$\t/
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(that was a TAB character).
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In awk each parameter is a field, in perl you can use split to get the
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parameters (except for strings).
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The following perl script changes note off messages to note on with
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vol=0, deletes controller 3 changes, makes some note reassignments on
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channel 10, and changes the channel numbers from channel 1 depending
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on the track number.
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------------------------------- test.pl -------------------------------
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%drum = (62, 36, 63, 47, 65, 61, 67, 40, 68, 54);
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while (<>) {
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next if /c=3/;
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s/Off(.*)v=[0-9]*/On\1v=0/;
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if (/ch=10/ && /n=([0-9]*)/ && $drum{$1}) {
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s/n=$1/"n=".$drum{$1}/e;
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}
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if (/^MTrk/) {++$trknr ; print "track $trknr\n";}
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if ($trknr > 2) { s/ch=1\b/ch=3/; }
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else { s/ch=1\b/ch=4/; }
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print || die "Error: $!\n";
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}
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------------------------------------------------------------------------
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and this is the corresponding awk script.
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------------------------------- test.awk -------------------------------
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BEGIN { drum[62] = 36; drum[63] = 47; drum[65] = 61; \
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drum[67] = 40; drum[68] = 54 }
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/c=3/ { next }
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($2 == "Off") { $2 = "On"; $5 = "v=0" }
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/ch=10/ { n = substr($4, 3); if (n in drum) $4 = "n=" drum[n] }
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/^MTrk/ { trknr++ }
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/ch=1 / { if (trknr > 2) { $3 = "ch=2" } else { $3 = "ch=3" } }
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{ print }
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------------------------------------------------------------------------
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