search

MajicDesigns / MD_MIDIFile

Standard MIDI Files (SMF) Processing Library
GNU Lesser General Public License v2.1
108 stars 38 forks source link

big gap when running in looping mode #2

Closed robmint closed 6 years ago

robmint commented 7 years ago

Thank you for sharing your useful lib.

I am running the library on Arduino Uno with some HID USB firmware to make the Uno appear as a midi device.

The main MCU is running your lib and reading midi from SD card and playing it in looping mode. I am using your example katzen perc fullvel.mid file.

The issue i'm having is a big gap in the playback after the file finishes (about 10 seconds). I'm trying to achieve a seamless looping of the midi file.

I have tried with other midi files and it seems the gap is not always so long, but there is always a gap of some length.

I've used your example code MD_MIDIFile_Loop.

I am using a midi monitor tool display all the midi messages as they are received. From the beginning:

11:46:34.160    From MIDI Exercycle Control 1   Bank Select 0
11:46:34.161    From MIDI Exercycle Control 1   Bank Select (fine)  0
11:46:34.162    From MIDI Exercycle Program 1   0
11:46:34.163    From MIDI Exercycle Control 1   Pan (coarse)    64
11:46:34.164    From MIDI Exercycle Control 1   Chorus Send Level   0
11:46:34.165    From MIDI Exercycle Control 1   Channel Volume (coarse) 100
11:46:34.166    From MIDI Exercycle Control 1   Reverb Send Level   0
11:46:34.353    From MIDI Exercycle Note On 1   62  127
11:46:34.446    From MIDI Exercycle Note Off    1   62  64
11:46:34.738    From MIDI Exercycle Note On 1   64  127
11:46:34.831    From MIDI Exercycle Note Off    1   64  64
11:46:35.123    From MIDI Exercycle Note On 1   65  127
11:46:35.217    From MIDI Exercycle Note Off    1   65  64
11:46:35.509    From MIDI Exercycle Note On 1   67  127
11:46:35.602    From MIDI Exercycle Note Off    1   67  64
11:46:35.894    From MIDI Exercycle Note On 1   69  127
11:46:35.987    From MIDI Exercycle Note Off    1   69  64
11:46:37.049    From MIDI Exercycle Note On 1   60  127
11:46:37.143    From MIDI Exercycle Note Off    1   60  64
11:47:58.915    From MIDI Exercycle Program 15  0
11:48:25.162    From MIDI Exercycle Control 13  Foot Control (coarse)   4
11:48:25.165    From MIDI Exercycle Control 13  Controller 24   8
11:48:28.429    From MIDI Exercycle Note Off    1   101 114
11:48:28.588    From MIDI Exercycle Note Off    1   0   0
11:48:28.639    From MIDI Exercycle Note Off    1   0   0
11:48:41.806    From MIDI Exercycle Note Off    1   64  0
11:48:41.956    From MIDI Exercycle Note Off    1   0   0
11:48:41.967    From MIDI Exercycle Note Off    1   100 0
11:48:42.113    From MIDI Exercycle Note Off    1   0   120
11:48:45.501    From MIDI Exercycle Note Off    1   127 58
11:48:45.687    From MIDI Exercycle Note On 1   64  127
11:48:45.780    From MIDI Exercycle Note Off    1   64  64
11:48:46.072    From MIDI Exercycle Note On 1   65  127
11:48:46.165    From MIDI Exercycle Note Off    1   65  64
11:48:46.457    From MIDI Exercycle Note On 1   67  127
11:48:46.550    From MIDI Exercycle Note Off    1   67  64
11:48:46.843    From MIDI Exercycle Note On 1   69  127
11:48:46.936    From MIDI Exercycle Note Off    1   69  64
11:48:47.997    From MIDI Exercycle Note On 1   60  127
11:48:48.092    From MIDI Exercycle Note Off    1   60  64
11:48:48.371    From MIDI Exercycle Note Off    1   101 114
11:48:48.531    From MIDI Exercycle Note Off    1   0   0
11:48:48.582    From MIDI Exercycle Note Off    1   0   0
11:49:01.749    From MIDI Exercycle Note Off    1   64  0
11:49:01.898    From MIDI Exercycle Note Off    1   0   0
11:49:01.909    From MIDI Exercycle Note Off    1   100 0
11:49:02.056    From MIDI Exercycle Note Off    1   0   120
11:49:05.443    From MIDI Exercycle Note Off    1   127 58
11:49:05.629    From MIDI Exercycle Note On 1   64  127
11:49:05.722    From MIDI Exercycle Note Off    1   64  64
11:49:06.014    From MIDI Exercycle Note On 1   65  127
11:49:06.108    From MIDI Exercycle Note Off    1   65  64
11:49:06.400    From MIDI Exercycle Note On 1   67  127
11:49:06.493    From MIDI Exercycle Note Off    1   67  64
11:49:06.785    From MIDI Exercycle Note On 1   69  127
11:49:06.878    From MIDI Exercycle Note Off    1   69  64
11:49:07.939    From MIDI Exercycle Note On 1   60  127
11:49:08.034    From MIDI Exercycle Note Off    1   60  64
11:49:08.314    From MIDI Exercycle Note Off    1   101 114
11:49:08.474    From MIDI Exercycle Note Off    1   0   0
11:49:08.524    From MIDI Exercycle Note Off    1   0   0
11:49:21.692    From MIDI Exercycle Note Off    1   64  0
11:49:21.841    From MIDI Exercycle Note Off    1   0   0
11:49:21.852    From MIDI Exercycle Note Off    1   100 0
11:49:21.998    From MIDI Exercycle Note Off    1   0   120
11:49:25.386    From MIDI Exercycle Note Off    1   127 58
11:49:25.572    From MIDI Exercycle Note On 1   64  127
11:49:25.665    From MIDI Exercycle Note Off    1   64  64
11:49:25.957    From MIDI Exercycle Note On 1   65  127
11:49:26.050    From MIDI Exercycle Note Off    1   65  64
11:49:26.342    From MIDI Exercycle Note On 1   67  127
11:49:26.436    From MIDI Exercycle Note Off    1   67  64
11:49:26.728    From MIDI Exercycle Note On 1   69  127
11:49:26.821    From MIDI Exercycle Note Off    1   69  64
11:49:27.882    From MIDI Exercycle Note On 1   60  127
11:49:27.977    From MIDI Exercycle Note Off    1   60  64
11:49:28.256    From MIDI Exercycle Note Off    1   101 114
11:49:28.416    From MIDI Exercycle Note Off    1   0   0
11:49:28.467    From MIDI Exercycle Note Off    1   0   0
11:49:41.634    From MIDI Exercycle Note Off    1   64  0
11:49:41.783    From MIDI Exercycle Note Off    1   0   0
11:49:41.795    From MIDI Exercycle Note Off    1   100 0
11:49:41.941    From MIDI Exercycle Note Off    1   0   120
11:49:45.328    From MIDI Exercycle Note Off    1   127 58
11:49:45.514    From MIDI Exercycle Note On 1   64  127
11:49:45.608    From MIDI Exercycle Note Off    1   64  64
11:49:45.900    From MIDI Exercycle Note On 1   65  127
11:49:45.993    From MIDI Exercycle Note Off    1   65  64
11:49:46.285    From MIDI Exercycle Note On 1   67  127
11:49:46.378    From MIDI Exercycle Note Off    1   67  64
11:49:46.670    From MIDI Exercycle Note On 1   69  127
11:49:46.763    From MIDI Exercycle Note Off    1   69  64
11:49:47.824    From MIDI Exercycle Note On 1   60  127
11:49:47.919    From MIDI Exercycle Note Off    1   60  64
11:49:48.199    From MIDI Exercycle Note Off    1   101 114
11:49:48.359    From MIDI Exercycle Note Off    1   0   0
11:49:48.409    From MIDI Exercycle Note Off    1   0   0

Any ideas?

MajicDesigns commented 7 years ago

The library does not add or remove any delays. So unless the application is adding a delay in the code, it plays the file as it reads it with a small overhead when the file is started. The delay must be in the actual file. You should edit the MIDI file using an appropriate tool to remove any quiet time at the start or end.