#!/usr/bin/python

# (c) Steve Gutteridge 26 January 2013
# RaspberryPi@SallyAndSteve.com
# http://SteveGutteridge.com
#
# Simple Midi Analyser
# 
# For Midi interface and other config requirements, try this website:
# http://www.siliconstuff.com/2012/08/serial-port-midi-on-raspberry-pi.html


import serial
import time

controllers=('undefined','Modulation Wheel','Breath Controller','undefined','Foot Controller',\
'Portamento Time','Data Entry Slider','Main Volume','Balance','undefined',\
'Pan','Expression Controller','undefined','undefined','undefined',\
'undefined','Gen Purpose Controller 1','Gen Purpose Controller 2','Gen Purpose Controller 3','Gen Purpose Controller 4',\
'undefined','undefined','undefined','undefined','undefined',\
'undefined','undefined','undefined','undefined','undefined',\
'undefined','undefined','LSB for controller 0','LSB for controller 1','LSB for controller 2',\
'LSB for controller 3','LSB for controller 4','LSB for controller 5','LSB for controller 6','LSB for controller 7',\
'LSB for controller 8','LSB for controller 9','LSB for controller 10','LSB for controller 11','LSB for controller 12',\
'LSB for controller 13','LSB for controller 14','LSB for controller 15','LSB for controller 16','LSB for controller 17',\
'LSB for controller 18','LSB for controller 19','LSB for controller 20','LSB for controller 21','LSB for controller 22',\
'LSB for controller 23','LSB for controller 24','LSB for controller 25','LSB for controller 26','LSB for controller 27',\
'LSB for controller 28','LSB for controller 29','LSB for controller 30','LSB for controller 31','Damper Pedal',\
'Portamento','Sostenuto','Soft Pedal','undefined','Hold 2',\
'undefined','undefined','undefined','undefined','undefined',\
'undefined','undefined','undefined','undefined','undefined',\
'Gen Purpose Controller 5','Gen Purpose Controller 6','Gen Purpose Controller 7','Gen Purpose Controller 8','undefined',\
'undefined','undefined','undefined','undefined','undefined',\
'undefined','undefined','Tremelo Depth','Chorus Depth','Celeste (Detune) Depth',\
'Phaser Depth','Data Increment','Data Decrement','Non Registered Parameter Number LSB','Non Registered Parameter Number MSB',\
'Registered Parameter Number LSB','Registered Parameter Number MSB','undefined','undefined','undefined',\
'undefined','undefined','undefined','undefined','undefined',\
'undefined','undefined','undefined','undefined','undefined',\
'undefined','undefined','undefined','undefined','undefined',\
'undefined','undefined','Channel Mode Messages','Channel Mode Messages','Channel Mode Messages',\
'Channel Mode Messages','Channel Mode Messages','Channel Mode Messages')

serialport = serial.Serial("/dev/ttyAMA0", baudrate=38400, bytesize=8, parity='N', stopbits=1, xonxoff=0, rtscts=0, dsrdtr=0, timeout=0)
print 'Awaiting MIDI input:'
runningstatus='0x0'
thisparam=1
params=1
while 1:
    	c=serialport.read(1000)
	if c<>'':
	    for x in c:
	      v=ord(x)
	      h=hex(v)
	      if h=='0xf7':
	       print 'System Exclusive End'
	       continue
	      else:
		if h=='0xf8': continue #Timing Tick. Ignore
		if h=='0xfe': continue #Active sensing. Ignore
		if v>127: #New Command
			midichannel=v%16
			runningstatus=h[:3]
			thisparam=1 #Next byte will be parameter no.1
                        if runningstatus=='0x8': params=2 #Note Off has 2 parameters
			elif runningstatus=='0x9': params=2
			elif runningstatus=='0xa': params=2
			elif runningstatus=='0xb': params=2
			elif runningstatus=='0xc': params=1
			elif runningstatus=='0xd': params=1
			elif runningstatus=='0xe': params=2
			elif runningstatus=='0xf':
				runningstatus=h
				if runningstatus=='0xf2': params=2
				elif runningstatus=='0xf0': params=1 #System Exclusive show params one at a time
				elif runningstatus=='0xf3': params=1
				elif runningstatus=='0xf5': params=1
				elif runningstatus=='0xf6': print 'Sysex Tune Request'
				elif runningstatus=='0xfa': print 'Sysex Start Song'
				elif runningstatus=='0xfb': print 'Sysex Continue Song'
				elif runningstatus=='0xfc': print 'Sysex Stop Song'
				elif runningstatus=='0xff': print 'Sysex System Reset'
			continue	
		if thisparam==1:
			param1=v #First parameter
		else:
			param2=v #Second parameter
		if thisparam==params: #All Parameters are in so process the message
			if runningstatus=='0x9': #Note On
				if param2==0:
					print 'ch',midichannel,': Note',param1,'Off'
				else:
					print  'ch',midichannel,': Note On',param1,'Velocity',param2
			elif runningstatus=='0x8': #Note Off
                                print  'ch',midichannel,': Note Off',param1,'Release Velocity',param2
			elif runningstatus=='0xa': #Key Pressure
                                print  'ch',midichannel,': Key Pressure Note',param1,'Pressure',param2
			elif runningstatus=='0xb': #Controller Change
                                print  'ch',midichannel,': Controller',param1,controllers[param1],'Value',param2
			elif runningstatus=='0xc': #Program Change
                                print  'ch',midichannel,': Program Change',param1
			elif runningstatus=='0xd': #Channel Pressure
                                print  'ch',midichannel,': Channel Pressure',param1
			elif runningstatus=='0xe': #Pitch Bend
                                print  'ch',midichannel,': Pitch Bend LSB',param1,'MSB',param2
			elif runningstatus=='0xf0': #System Exclusive
				print 'System Exclusive Data Byte',param1
			elif runningstatus=='0xf2': #Song Position
				print 'Sysex Song Position LSB',param1,'MSB',param2
			elif runningstatus=='0xf3': #Song Select			
				print'Sysex Song Select',param1
			elif runningstatus=='0xf5': #Unofficial Bus Select
                                print'Sysex Unofficial Bus Select',param1

			thisparam=1 # For Running Status might get another message of same type
		else:
			thisparam=thisparam+1