MIDI.
The following is a MIDI file similar to Ballade2.mid.
4d
54 68 64 4-character chunk ID: "MThd"
00 00 00 06 length of the header: 6 bytes
00 01 file format:
format 1
00 10 # of tracks:
16 tracks in this file
00 c0 MSb=0, resolution per quarter note:
192 ticks per quarter note
4d 54 72 6b 4-character chunk ID: "MTrk"
00 00 00 7c length of the track: 124 Bytes
delta time track
event Intepretation
========= =========== =====================================
00 ff 7f 03 00 00 41 meta event, (?) 3 bytes
00 ff 58 04 04 02 18 08 Time signature meta event, 4/4 meter?
00 ff 51 03 0a 49 6d Tempo meta event, 674157
microsec/quarternote
00 ff 59 02 00 00 Key signature
meta event, C major
00 ff 01 2a 43 6f ... Copyright meta event?
4d 54 72 6b 4-character
chunk ID: "MTrk"
00 00 09 61 length
of the chunk data: 2401 bytes
delta track event
Interpretation
time
===== =========== =====================================
00 ff 21 01 01 meta event?
00 ff 03 14 50 ... instrument name, 20 bytes, Piano
Treble
00 c1 02 Program
change on channel 1, patch #2
00 b1 07 61 Control change
on channel 1, volume level 91
(loud,
80 normal)
00 b1 0a 7f continuous controller(MIDI
knob), max. postion(127)
00 91 37 7f Note on channel
1,note=55(G,octave3), vel=127(loud)
60 39 7f note=57,
vel=127(loud) after 96/192 quarternote
(A,
octave3), running status without command
60 3c 7f note=60(C,
octave4), vel=127 after eighth note
5e 41 7f note=65(F,
octave4), vel=127 after 94/192 qnote
8140 43 7f note=67(G,
octave4), vel=127 after 192/192 qnote
10 81 37 40 Note off,
note=55, vel=64(med.) after 16/192 qnote
8130 91 41 7f Note on, note=65, vel=127
after 176/192 quarternote
06 81 3c 40 Note off,
note=60, vel=64 after 6/192 quarternote
0c 37 40 note=55,
vel=64, after 12/192 quarternote
4e 91 37 7f Note on, note=55,
vel=127, after 78/192 qnote
- How long
is the playtime of the first note (G Octave3) in terms of seconds?
- If the above
MIDI code after 4e 91 37 7f is followed by 00 91 30 60. Explain
these four bytes using the format similar to the above interpretation.