[chuck-users] ChucK FLOSS - MIDI reference

[mario buoninfante]

Hi Juan,


thanks a lot for that. I forgot there was an example about it. despite I 
work quite a lot with MIDI in general, from both programming and musical 
purposes, I've almost never used MIDI files. so, honestly I've never 
paid attention to that example, mea culpa :)

apart from that, now I'd like to know what are the differences between 
MidiFileIn and MidiRW. I'll dig a bit more into the source code. in the 
meanwhile I updated the ChucK FLOSS manual, with at least all the 
methods I found on the link you sent. I'll try to get the descriptions 
as well as soon as possible.


cheers,

Mario


On 22/05/18 22:48, Juan Reyes wrote:
> Hi Mario,
>
> Have used 'MidiFileIn' as per  '/examples/midi/playmidi.ck'
>
> Some documentation is on:
> [1]  https://ccrma.stanford.edu/~spencer/ckdoc/io.html#MidiFileIn
>
> BTW, Thanks to Spencer for MidiFileIn'.
>
> Tricky parts are more related to MidiMsg and actual midifile
> manipulation.  'playmidi.ck' only triggers noteOns from the MIDI file.
> For NoteOffs another MidiMsg conditional (or filter for this kind of
> data stream on file) needs to be added. Tempo can also be manipulated 
> by just hacking 'playmidi.ck' code.
>
> Certainly one needs to get fluent on MIDI messaging hexadecimal codes.
> NoteOn is 0x90 and NoteOff is 0x80. NoteOffs are useful to get actual
> note durations. Some STK Ugens sustain forever if you don't have
> NoteOffs, -in fact wherever an ADSR is not used-.
>
> Below some code that works to get NoteOffs and for illustration
> purposes. Can post all the code or email it, in case you need it.
>
> Thanks for the MIDI Reference chapter on the ChucK FLOSS manual.
>
>   -- Juan Reyes
>
>
> //**********************************************************//
>
> MidiFileIn min;
> MidiMsg msg;
>
> 0 => int j;
> time delta;
> float beg;  // start midi note
> 0.0 => float durat;
>
>  if((msg.data1 & 0xF0) == 0x90 && msg.data2 > 0 && msg.data3 > 0)
> {
> <<< j, "  NOTE-ON KEY:  ", msg.data2, "Velocity: ", msg.data3 >>>;
>     1 +=> j;
>  }
>
> if((msg.data1 & 0xF0) == 0x80)
>  {
>    beg-last => durat;
>  <<< "NOTE-OFF:  ",msg.data2, msg.data3, "start: ", beg, "  duration: ",
> durat >>>;
>
> beg => last;
> }
>
> //**********************************************************//
>
>
>>
>> at the moment there are info about MIDI also under the Event 
>> Reference, which I don't wanna touch for now. anyway, there are a 
>> couple of classes I've never seen before, MidiMsgIn, MidiMsgOut and 
>> MidiFileIn, has anyone ever used them?
>>