polymerchm / chordcalc Goto Github PK

Not sure how the mechanics would work, maybe choose which chords to drill, or scales, or have to identify all scale notes in some range of frets...

I was playing around to see if javascript midi.js could be used to do midi within pythonista (answer yes... It's slow)... But came across "soundfonts" which are sampled sounds, or at least generated samples.

https://github.com/gleitz/midi-js-soundfonts/tree/master/FluidR3_GM

Here's a dirty script to download a few sounds and create a slew of mp3s. I was lazy and downloaded the single .js which contains all sounds, rather than downloading individual mp3s which might be faster since they don't need to be base64 encoded... Maybe. A better option might be to zip them up for distribution.

import json, base64, urllib,ui
instruments=['banjo','acoustic_guitar_steel','slap_bass_1']


def download_soundfont(instrument):
    print 'downloading'+instrument
    p=ui.Label()
    p.present('popover')
    def report(count,size,total):
        p.text= '{:0.0f} % complete'.format(round(100*count*size/(1.0*total)))
        p.size_to_fit()
        if not p.on_screen:
            p.present('popover')
        p.set_needs_display()
    filename=instrument+'-mp3.js'

    urllib.urlretrieve('https://raw.githubusercontent.com/gleitz/midi-js-soundfonts/master/FluidR3_GM/'+filename
                       ,filename
                       ,report)
    p.close()


    with open(instrument+'-mp3.js') as f:
        s=f.read()

    #extract the dict
    s=s[s.find('{\n'):s.find(',\n\n}')-1]+'"}'
    d=json.loads(s)

    for note,data in d.items():
        start=data.find('//')
        with open(instrument+'_'+note+'.mp3','wb') as f:
          f.write(base64.decodestring(data[start:]))


for inst in instruments:
    download_soundfont(inst)

Standard 5 string banjo tuning is g'DGbd.

Also. Something is strange about adding a new tuning... For 5 string banjo, the tuning shows g'DGbg', but the spinners come up as g' D G c g'. The second to last spinner shows s different value than the tuning, until that spinner is touched.

This is in devel-capo branch (is that the latest? You might want to push to master)

Thus overriding builtin max and min functions. Consider putting that code into a function, then call the function, to avoid polluting global namespace.

Consider zipping up sound fonts, then just grabbing data over the wire once (per instrument maybe), then unzipping locally.. Opening url's is expensive, at least on a slow/lossy connection..