I'm looking into the problem of converting midi files (from other notesetting programs) to lilypond code. My experiments is available as:
http://turkos.aspodata.se/git/musik/bin/miditoly.pl and my intentions is to make it generate code like I would have written it. So if you have any helpful thoughts, you are welcome. /// The current problem is how to interpret midi note lengths. As examples I'm using: http://www1.cpdl.org/wiki/images/0/0e/Slovenec_sem.mid http://www1.cpdl.org/wiki/images/1/12/Slovenec_sem.pdf http://manfredhoessl.de/files/F295n6.MID http://www3.cpdl.org/wiki/images/sheet/fuh-2956.pdf /// Some comments on midi2ly's output of Slovenec_sem: Here midi2ly takes the easy way out letting lilypond do splitting of notes and rests at engraving time: \layout { \context { \Voice \remove "Note_heads_engraver" \consists "Completion_heads_engraver" \remove "Rest_engraver" \consists "Completion_rest_engraver" } } I want the generated code to generate \time 4/4 r4 a a2~ | a4 r r2 | instead of \time 4/4 r4 a a2. r2. === midi2ly doesn't detect upbeats. In a midi file, one can identify an upbeat with by looking at the first two time signatures n1/d1 n2/d2. It is an upbeat if d1 == d2 && n1 < n2 && the second time signature appear in the second bar: trackAchannelA = { \key c \major \time 1/4 \tempo 4 = 80 \key c \major \skip 4 | % 2 \time 3/4 } The above should be written as: trackAchannelA = { \key c \major \time 3/4 \tempo 4 = 80 \partial 4 \skip 4 | } === This is not how I want my lilypond code: trackBchannelB = \relative c { g'4*442/480 r4*38/480 <e' c >4*332/480 r4*28/480 <c g >4*111/480 r4*9/480 g4*442/480 r4*38/480 | % 2 <e' c >4*442/480 r4*38/480 <f d >4*332/480 r4*28/480 <d b >4*111/480 r4*9/480 <b g >4*442/480 r4*38/480 ... | % 9 <e c >4*442/480 r4*38/480 <f b, >4*884/480 r4*76/480 | % 10 everything is 4th's, the 16th's (third note/chord) as well as the half notes (<e c> in bar 10), it also inserts rests which more is an articulation, perhaps a "long staccato". I want the above to be rendered more like: trackBchannelB = \relative c { \partial 4 g4 | <e' c>8. <c g>16 etc. /// Taking statistics of the file gives me (ticks is #of timesteps for a quarter none): ticks : 480 Duration 1/4 Count 111 0.2313 15 *(111)* 221 0.4604 128 *(221)* 332 0.6917 15 *(332)* 442 0.9208 94 *(442)* 663 1.3813 34 *(663)* 884 1.8417 18 *(884)* I see that 221 is close to 2*111 (the shortest duration), 332 close to 3*111, etc. That could be a hint. Robert Führers mass (the second example) have durations that are easily converted to lilypond lengths: ticks : 1024 Duration 1/4 Count 205 0.2002 13 *(205)* 256 0.2500 16 16 512 0.5000 850 8 768 0.7500 3 8. 1024 1.0000 1182 4 1280 1.2500 1 16*5 1536 1.5000 57 4. 2048 2.0000 290 2 2560 2.5000 1 8*5 3072 3.0000 14 2. 4096 4.0000 15 1 16*5 is (here) the same as like a4~ a16 Ideas on algorithms on how to decode the durations, how do I separate staccato from real rests, etc. are welcome. Regards, /Karl Hammar ----------------------------------------------------------------------- Aspö Data Lilla Aspö 148 S-742 94 Östhammar Sweden +46 173 140 57 _______________________________________________ lilypond-user mailing list lilypond-user@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-user
