miredis/midicontrol.py

#!/usr/bin/python3
# -*- coding: utf-8 -*-
# -*- mode: Python -*-


'''

Midi controlled skeleton
v0.1.0

Needs miredis (listen to midi devices)


Licensed under GNU GPLv3

by Sam Neurohack

'''

import sys
import traceback
import argparse
import redis
import ast

argsparser = argparse.ArgumentParser(description="Midi/Redis control skeleton")
argsparser.add_argument("-c","--channel",help="Default midi channel (1)",default="1",type=str)
argsparser.add_argument("-m","--mode",help="Default running mode (33)",default="33",type=str)
args = argsparser.parse_args()

cchannel=args.channel
note = args.mode


ip = '127.0.0.1'
port = 6379
rds = redis.Redis(
        host=ip,
        port=port)

MidiSub = rds.pubsub()
MidiSub.subscribe("/midi/last_event")
print("Midi events subscribed")

cc = [0]*128
bpm = 120
notejump = {"33": "modeA()", 
            "35": "modeB()", 
            "44": "sys.exit(0)"     # Beware
            }


def MidiSubEvent():
  global note

  msg = MidiSub.get_message()
  
  if msg:
    message = str(msg['data'])

    # Noteon change main function via notejump
    if message.find('noteon') != -1:
      noteon = message.split("/")
      #print(noteon)
      #if noteon[3] == cchannel:
      
      if noteon[4] in notejump:
        note = noteon[4]
        print(notejump[note])


# Audio Redis keys continuously updated by specredis
def Current():
  global data1, data2, data3

  # live audio parameters from specredis.py in redis

  # if data1 key like "[2.96, 1.01, 4.89, 3.29, 2.53, 2.10, 1.84, 1.66, 1.56, 1.50]"
  data1redis = rds.get('levels')
  data1 = ast.literal_eval(data1redis.decode('ascii'))
  data1width = len(data1)
  data2 = float(rds.get('spectrummax'))
  data3 = float(rds.get('spectrumsum'))


# 1 CC -> 7 bits number : 0-127 
# rerange end value between low high 
# midifactor(ccnumber, channel, low, high, default)
def midifactor(ccnumber, channel = cchannel, low =0, high=127, default =1):

  ccvalue = rds.get('/midi/cc/'+str(channel)+'/'+str(ccnumber))

  if ccvalue is not None:
    return rerange(int(ccvalue), 0, 127, low, high)

  else:
    print('Default value returned. No midi value in redis for channel', channel, 'CC', ccnumber)
    return default

# 2 CC -> 14 bits number : 0 - 16383
# rerange end value between low high
# midifactor(ccnumber, channel, low, high, default)
def midifactor14(highcc, lowcc, channel = cchannel, low =0, high=16383, default =1):

  lowvalue = rds.get('/midi/cc/'+str(channel)+'/'+str(lowcc))
  highvalue = rds.get('/midi/cc/'+str(channel)+'/'+str(highcc))

  if lowvalue is not None and highcc is not None:
    return rerange((int(highvalue) << 7)+ int(lowvalue), 0, 16383, low, high)

  else:
    print('Default value returned. No midi value in redis for channel', channel, 'CC', ccnumber)
    return default


# increase or decrease value 
def Encoder(ccnumber, channel = cchannel):

  ccvalue = rds.get('/midi/cc/'+str(channel)+'/'+str(ccnumber))

  # encoder turned to right
  if ccvalue == 1:
      EncoderPlusOne(ccnumber)

  # encoder turned to left
  if ccvalue == 127:
      EncoderMinusOne(ccnumber)

def EncoderPlusOne(ccnumber):
  global cc
    
  cc[ccnumber] +=1
  print(cc[ccnumber])

def EncoderMinusOne(ccnumber):
  global cc

  if cc[ccnumber] >0:
    cc[ccnumber] -= 1
    print(cc[ccnumber])

def rerange(s,a1,a2,b1,b2):
    return  b1 + ((s - a1) * (b2 - b1) / (a2 - a1))

#
# mode A
#


def modeA():

  print(midifactor(0, channel = cchannel, low =0, high=127, default =1))
  pass


#
# mode B
#

def modeB(): 

  print(midifactor14(0, 1, channel = cchannel, low =0, high=16383, default =1))
  pass


#
# Main loop
#

if __name__ == "__main__":

  note = "33"
  running = True

  try:

    if (note in notejump) == False:
      print('No function for that note')
      sys.exit(0)
    print('running', notejump[note])

    while running:

      # Some redis keys pull
      Current()

      # /noteon redis subscribe event like noteon -> change mode via eval
      MidiSubEvent()

      eval(notejump[str(note)])


  except Exception:
    print(traceback.print_exc())

  except KeyboardInterrupt:
      sys.exit(0)

  finally:
    print("End")
    sys.exit(0)