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  Tuesday, 15 June 2021
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I decided to make my sequenser try to set correct tempo/BPM when importing.

But i am not sure howto read out tempo from a JSON file?
Should one try read out tempo/BPM from bass and snares i midifiles?

Any ideas how i could findout tempo from JSON below?

{
"header": {
"keySignatures": [],
"meta": [],
"name": "FNK 4-4 NmlStr T052 FullKit",
"ppq": 480,
"tempos": [],
"timeSignatures": [
{
"ticks": 0,
"timeSignature": [
4,
4
],
"measures": 0
}
]
},
"tracks": [
{
"channel": 9,
"controlChanges": {},
"pitchBends": [],
"instrument": {
"family": "drums",
"name": "standard kit",
"number": 0
},
"name": "FNK_4-4_NmlStr_T052_FullKit_047",
"notes": [
{
"duration": 0.030208333333333334,
"durationTicks": 29,
"midi": 36,
"name": "C2",
"ticks": 0,
"time": 0,
"velocity": 0.6614173228346457
},
{
"duration": 0.030208333333333334,
"durationTicks": 29,
"midi": 42,
"name": "F#2",
"ticks": 0,
"time": 0,
"velocity": 0.7559055118110236
},
{
"duration": 0.030208333333333334,
"durationTicks": 29,
"midi": 54,
"name": "F#3",
"ticks": 0,
"time": 0,
"velocity": 0.7559055118110236
},
{
"duration": 0.034375,
"durationTicks": 33,
"midi": 42,
"name": "F#2",
"ticks": 116,
"time": 0.12083333333333333,
"velocity": 0.41732283464566927
},
{
"duration": 0.034375,
"durationTicks": 33,
"midi": 54,
"name": "F#3",
"ticks": 116,
"time": 0.12083333333333333,
"velocity": 0.41732283464566927
},
{
"duration": 0.034375,
"durationTicks": 33,
"midi": 56,
"name": "G#3",
"ticks": 116,
"time": 0.12083333333333333,
"velocity": 0.41732283464566927
},
{
"duration": 0.03437500000000002,
"durationTicks": 33,
"midi": 42,
"name": "F#2",
"ticks": 236,
"time": 0.24583333333333332,
"velocity": 0.5590551181102362
},
{
"duration": 0.03437499999999999,
"durationTicks": 33,
"midi": 54,
"name": "F#3",
"ticks": 356,
"time": 0.37083333333333335,
"velocity": 0.41732283464566927
},
{
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"durationTicks": 33,
"midi": 56,
"name": "G#3",
"ticks": 356,
"time": 0.37083333333333335,
"velocity": 0.41732283464566927
},
{
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"durationTicks": 33,
"midi": 38,
"name": "D2",
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"time": 0.49583333333333335,
"velocity": 0.6771653543307087
},
{
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"velocity": 0.7559055118110236
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"time": 0.6208333333333333,
"velocity": 0.41732283464566927
},
{
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"time": 0.7458333333333333,
"velocity": 0.5590551181102362
},
{
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"time": 0.7458333333333333,
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{
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"name": "C2",
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"time": 0.9958333333333333,
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5 months ago
·
#9347
Accepted Answer
0
Votes
Undo
In a previous thread, Jonas wrote, "I use this json parser [...] https://tonejs.github.io/Midi/".

This particular parser appears to use a "tempos" array to list all of the tempo events in the MIDI file. If the MIDI file has no tempo events, then the "tempos" array is empty:

    "tempos": [] 

If the MIDI file has one or more tempo events, then the "tempos" array contains an object for each tempo event:

    "tempos": [
{
"bpm": 120,
"ticks": 0
},
{
"bpm": 40,
"ticks": 1440
}
]


According to the Standard MIDI Files specification, if there is no tempo event in the MIDI file, a default tempo of 120 quarter notes per minute should apply. (From the Standard MIDI Files specification PDF page 7 [printed page 5]: "All MIDI Files should specify tempo and time signature. If they don't, the time signature is assumed to be 4/4, and the tempo 120 beats per minute.")

Every MIDI sequencer I have encountered follows the specification's default, except for one! The current version of Cakewalk incorrectly uses a default of 100 quarter notes per minute when there is no tempo event in the MIDI file.
5 months ago
·
#9345
0
Votes
Undo
I think it is no tempo information "BPM" in midifiles, they must somehow understood that people will use metronomes create music.
5 months ago
·
#9347
Accepted Answer
0
Votes
Undo
In a previous thread, Jonas wrote, "I use this json parser [...] https://tonejs.github.io/Midi/".

This particular parser appears to use a "tempos" array to list all of the tempo events in the MIDI file. If the MIDI file has no tempo events, then the "tempos" array is empty:

    "tempos": [] 

If the MIDI file has one or more tempo events, then the "tempos" array contains an object for each tempo event:

    "tempos": [
{
"bpm": 120,
"ticks": 0
},
{
"bpm": 40,
"ticks": 1440
}
]


According to the Standard MIDI Files specification, if there is no tempo event in the MIDI file, a default tempo of 120 quarter notes per minute should apply. (From the Standard MIDI Files specification PDF page 7 [printed page 5]: "All MIDI Files should specify tempo and time signature. If they don't, the time signature is assumed to be 4/4, and the tempo 120 beats per minute.")

Every MIDI sequencer I have encountered follows the specification's default, except for one! The current version of Cakewalk incorrectly uses a default of 100 quarter notes per minute when there is no tempo event in the MIDI file.
Jonas selected the reply #9347 as the answer for this post — 5 months ago
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