midifile | C++ classes for reading/writing Standard MIDI Files | Audio Utils library
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C++ classes for reading/writing Standard MIDI Files
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QUESTION
Im trying to write a complete music using midiutil library with python. So far, i have been able to add any instrument i've wanted via
MIDIFile.addProgramChange(track, channel, time, program)
and taking the program number from the table at https://www.midi.org/specifications-old/item/gm-level-1-sound-set
However, i cant add any drumset sounds the way i want. I know channel 10 is reserved for percussion, but whenever i write anything via
MyMIDI.addNote(track, 10, pitch, time + i, duration, volume)
the sound played by musescore is played in the piano voice or in the voice defined by the ProgramChange method. I know there is drumset sounds somewhere in my computer because i have been able to manually add drumset sounds in musescore. Am i doing something wrong?
...ANSWER
Answered 2021-May-16 at 18:07Humans begin counting at one, so you have channels 1 … 16.
Computers begin couting at zero, so they have channels 0 … 15.
The addNote() documentation says that the channel parameter is an integer from 0 to 15, so you must use 9 for the percussion channel.
QUESTION
I bought a VDRUM kit not long ago that has a MIDI out. I've had a raspberry pi lying around here from a previous project and I've had the idea to use that small computer as recorder.
So I've written a headless application that runs on the PI and listens to the MIDI Out port of the VDRUM kit. Upon receiving an input other than silence i start recording via the jdk libraries and place it on a samba server with timestamp.
That way I save everything I ever play. Now I've setup my audio workstation to receive those MIDI files from the samba share and I noticed, that they often have a very long "silent" part in the beginning of the MIDI file.
Is there a way to programatically remove the silence at the beginning of a midi sequence? I'm new to this MIDI stuff and still learning.
Here's the code that starts and stops the recording:
...ANSWER
Answered 2021-Feb-22 at 13:20You need to shift all MidiEvents of the Sequence to remove the leading silence.
QUESTION
I'm using DryWetMidi library in C# and trying to acquire a program/instrument title from a loaded chunk, but I fail to find such field that gives me the title. So far I just have:
...ANSWER
Answered 2021-Jan-09 at 13:52TrackChunk has Events property which gives access to all MIDI events within a track chunk. Just find ProgramChangeEvent ones and collect program numbers:
QUESTION
I have a list with barline ticks and midi notes that can overlap the barlines. So I made a list of 'barlineticks':
...ANSWER
Answered 2020-Oct-20 at 18:36Simple iteration to solve the requirement:
QUESTION
G'day! I seem to have imported a library from GitHub (https://github.com/LeffelMania/android-midi-lib) to "dependencies", but when I tried:
...ANSWER
Answered 2020-Aug-24 at 22:26That imports the file during compilation. You still need to add the dependency in the build system, or it won't know where to look for the file. Assuming a standard gradle build, you need to add it to the build.gradle file. Look for the dependencies section for an example, you need to know what version of the library, the name of the library, and the nae of the target within it in whatever package repository you're using.
If instead you mean you downloaded the source and tried to build it that way, you still need a dependency, you just need to make it a local one and not a remote.
QUESTION
first of all changing volume is working but i got some problems while changing the volume so 1) after changing the volume like setting it to 0 (no volume) you still hearing parts of the song in the default value of the volume 2)after song changed the volume getting back to the default value of the volume
...ANSWER
Answered 2020-Aug-22 at 21:26volumeMessage.setMessage(ShortMessage.CONTROL_CHANGE, i, CHANGE_VOLUME,(int)(value * 127.0));
volumeMessage.setMessage(ShortMessage.CONTROL_CHANGE, i, 39, (int)(value * 127.0));
MidiSystem.getReceiver().send(volumeMessage, -1);
QUESTION
I am trying to figure out how to convert from midi time to bars and beats. Here is a sample midi file. If you download that and open the file in a program like GarageBand, you'll see the third track contains four notes in the first bar:
Now if you load the file with mido in Python, you can see the first four notes in the same track:
ANSWER
Answered 2020-Jun-12 at 01:09Praise all things good and holy, mido.MidiFile reads the ticks per beat metadata and stores it in mido.MidiFile.ticks_per_beat:
QUESTION
I've tried to merge 2 midi files into one, such that the second midi file will not be heard when playing the output midi file. I've managed to get a result that plays only the first song, but I wonder if there is a way to hide (encrypt) the second file with the option to recover it out of the output file.
In my way, there is no option for recovery, because all of the second song's notes are in velocity 0, so unless I write the original velocity to an external file or something like that, it's impossible to recover them.
...ANSWER
Answered 2020-Jun-05 at 19:22I've managed to hide the velocities with Meta-Messages.
For every note's message I took it's velocity and created a new Meta-Message with a json object "{index_of_note_in_track: old_velocity}", and put those Meta-Messages in the end of the track.
QUESTION
I am trying to read a midi file in the following manner using an in-built function from the library - mido to read such files.
ANSWER
Answered 2020-May-15 at 16:00Python uses backslash for string escapes - which lets you define different values for a character sequence. Just as \n is a newline, \a is the hex byte 07. You can escape the backslash itself, so \\ is just a backslash. And you can use "raw" strings (e.g., `r"\a") to disable escaping all together.
QUESTION
I have a dataset of midi songs and I would like to clean them as much as possible without losing much information. I really dont know much about music and I just started to work with midifiles so my knoledge is limited. What I have done so far is filtering all the events that seem irrelevant to me. The events I am keeping are:
- Note events
- Tempo events
- Control change events (only with control 64, which I think represents the pedal of the piano)
Another thing Ive done is to erase all the tempo events and set just one tempo event to 120bpms at the beggining by replacing the ticks of the other events according to the previous tempo events. Now I would like to be able to clean the control change events aswell.
Is there a way to modify the note events (maybe the duration) to achieve a similar effect to the control change event so that I can erase all the control change events (since most of their information would be present in the notes)?
What I want to achieve is a format that only encodes the note characteristics (time of appearance, duration, pitch, velocity) but be able to reproduce almost the same song.
...ANSWER
Answered 2020-May-10 at 07:42It would be possible to move all note-off events that happen while the sustain pedal is active to the time of the sustain release event, and then remove the sustain events. But if you have a synthesizer that handles note-off and sustain differently (e.g., by modelling sympathetic resonance), then the result will be different.
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