hello, > rj-library, the help file for [c_seqplay] contains an > example how to convert a > midi file to a text file, that [qlist] can read (using > Cyclon's [seq] instead > of [midifile]). Once you have the qlist-file, you can > reverse it using for > example the "tac" command in Linux/OS-X - "tac" is the > opposite of "cat".
yeah this is nice. I will have to try it out this week when i get the chance.... > This actually isn't too hard if some external tools are > allowed. yeah i have been using 'gnmidi' on windows to reverse midi files and do some other manipulations on them. also there is an interesting keykit webapp that does some nice stuff (http://www.nosuch.com/tjt/tunetoys.html) ... ableton also has added some nice midi functionality. i was trying to figure out how to do some of these things (reversing, random tick sequence) directly in PD with midifile but i get a lot of hangs... > > Actually doing it might be difficult though - MIDI > files have > > variable-length fields, so you probably have to decode > *all* of it into > > some other format or data structure before you start > playing from the > > end. ... with this in mind. so, yeah, the midi -> text file / qlist stuff looks more promising... Thanks for the responses! mark --- On Mon, 11/2/09, Frank Barknecht <f...@footils.org> wrote: > From: Frank Barknecht <f...@footils.org> > Subject: Re: [PD] midifile ... in reverse > To: pd-list@iem.at > Date: Monday, November 2, 2009, 4:35 AM > Hallo, > Claude Heiland-Allen hat gesagt: // Claude Heiland-Allen > wrote: > > > mark edward grimm wrote: > >> Is is possible to play a midifile in reverse > > > > Sure, if you want each note-off message to happen > before its > > corresponding note-on messages! > > > > Actually doing it might be difficult though - MIDI > files have > > variable-length fields, so you probably have to decode > *all* of it into > > some other format or data structure before you start > playing from the > > end. > > This actually isn't too hard if some external tools are > allowed. In the > rj-library, the help file for [c_seqplay] contains an > example how to convert a > midi file to a text file, that [qlist] can read (using > Cyclon's [seq] instead > of [midifile]). Once you have the qlist-file, you can > reverse it using for > example the "tac" command in Linux/OS-X - "tac" is the > opposite of "cat". > > As qlist-files encode delta times or times between events, > loading this > reversed file into qlist will make it play back the whole > midi file backwards. > > As you noted, the notoffs then happen before the noteoffs, > so some additional > tweaking may be wanted, either to the file format or to > your Pd player logic. > > Ciao > -- > Frank > > _______________________________________________ > Pd-list@iem.at > mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list > _______________________________________________ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
