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frames_per_buffer tells the stream object the number of samples we'll be feeding it at a time.output is set to True cause we are "writing" to a speaker rather than "reading" from some input.format is the format of each sample which here is set to signed 16 bit integers.channels is the number of audio channels.stream = pyaudio.PyAudio().open( rate=44100, channels=1, format=pyaudio.paInt16, output=True, frames_per_buffer=256 ) We need to first set up a PyAudio stream to which we can write the synth output values. I found this link to be useful in decoding the status codes.īefore we get to the playing part we need to route the synthesizer output to the speaker, for this we can use pyaudio. VIRTUAL MIDI PIANO KEYBOARD SCRATCHY SOUND CODEIf your MIDI controller is pressure sensitive or has some other fancy features (knobs, sliders) that you would like to map to some code you can use a simple loop to figure out what’s what: try: while True: if midi_input.poll(): print(midi_input.read(num_events=16)) except KeyboardInterrupt as err: print("Stopping.") Both data1 and data2 have values in the range of 0 to 127. On my MIDI controller data3 just holds 0 for both the status codes, so this can be ignored. Note : Before using data2 you'll have to ensure that your MIDI device is velocity sensitive. Think of this as how quickly a note has been pressed or released. data2 : This indicates the velocity for both note on and note off, you can use this to set the amplitude of your note.data1 : This gives us the MIDI value of the note, example a value of 60 indicates C4.128 : This stands for note off, this is the status code that is sent when lift your finger off a key.įor both the above status values, the data* values are the same 144 : This stands for note on, this is the status code that is sent when you push down a key on the MIDI controller. Here we’ll be concerned with only two different status values: So we need to call midi_input.read only if this returns True.Įach number, except timestamp is a byte, and the value of status tells us what the other ( data*) numbers mean. midi_input.poll() : This will basically tell us if there's any event to be read by returning a bool.midi_input.read : This will return the MIDI events (such as pressing a key) that occured and were stored in a buffer as a list of events, each event in the list has the form of, timestamp], all the named values here are numbers.There are two main functions here that we'll be using: Now using midi_input we can get MIDI messages from our controller. Also, a MIDI controller can have multiple devices on it, midi.get_count() should give you the number of devices, you can switch the one being used by selecting a different id.Make sure that default_id isn't -1, this happens if your MIDI controller isn't connected properly or if one isn’t plugged in to ensure that its being detected you can run midi.get_device_info(default_id) to make user that the name you see is the same your device.This sets up the midi.Input object which will allow us to receive data from our controller. Using it is pretty simple, you first initialize and then set it up: midi.init() default_id = midi.get_default_input_id() midi_input = midi.Input(device_id=default_id) To deal with MIDI input we’ll use pygame.midi. ![]() What I'm hoping for input on here are if there are other recommended options.MIDI stands for Music Instrument Digital Interface and refers the the set of things (protocols, connectors, etc) that allow digital instruments and controllers communicate with each other.įor our purpose, MIDI defines the type of controller we’ll be using and the type of values we can expect from the controller when we use it.
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