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comparison bcf2000.py @ 350:c7478a778992

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junky first pass at bcf2000 for keyboardcomposer
author Drew Perttula <drewp@bigasterisk.com>
date Sun, 10 Jun 2007 07:41:48 +0000
parents
children bd8a89743226
comparison
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349:768d0d12c3a4 350:c7478a778992
1 #!/usr/bin/python
2 from __future__ import division
3 import math
4 import twisted.internet.fdesc
5 from twisted.internet import reactor
6 from twisted.internet.task import LoopingCall
7
8 class BCF2000(object):
9
10 control = {81 : "slider1", 82 : "slider2", 83 : "slider3", 84 : "slider4",
11 85 : "slider5", 86 : "slider6", 87 : "slider7", 88 : "slider8",
12
13 1 : "knob1", 2 : "knob2", 3 : "knob3", 4 : "knob4",
14 5 : "knob5", 6 : "knob6", 7 : "knob7", 8 : "knob8",
15
16 33 : "button-knob1", 34 : "button-knob2",
17 35 : "button-knob3", 36 : "button-knob4",
18 37 : "button-knob5", 38 : "button-knob6",
19 39 : "button-knob7", 40 : "button-knob8",
20
21 65 : "button-upper1", 66 : "button-upper2",
22 67 : "button-upper3", 68 : "button-upper4",
23 69 : "button-upper5", 70 : "button-upper6",
24 71 : "button-upper7", 72 : "button-upper8",
25 73 : "button-lower1", 74 : "button-lower2",
26 75 : "button-lower3", 76 : "button-lower4",
27 77 : "button-lower5", 78 : "button-lower6",
28 79 : "button-lower7", 80 : "button-lower8",
29 89 : "button-corner1", 90 : "button-corner2",
30 91 : "button-corner3", 92 : "button-corner4",
31 }
32
33 def __init__(self, dev="/dev/snd/midiC1D0"):
34 self.devPath = dev
35 self.dev = None
36 self.reopen()
37 self.lastValue = {} # control name : value
38 self.packet = ""
39 loop = LoopingCall(self.poll)
40 loop.start(.02)
41
42 def poll(self):
43 try:
44 bytes = self.dev.read(3)
45 except IOError, e:
46 return
47 if len(bytes) == 0:
48 print "midi stall, reopen slider device"
49 self.reopen()
50 return
51 self.packet += bytes
52 if len(self.packet) == 3:
53 p = self.packet
54 self.packet = ""
55 self.packetReceived(p)
56
57 return
58
59 while 1:
60 packet = self.dev.read(3)
61 while len(packet) < 3:
62 if len(packet) == 0:
63 self.reopen()
64 packet += self.dev.read(3 - len(packet))
65
66 def packetReceived(self, packet):
67 b0, which, value = [ord(b) for b in packet]
68 if b0 != 0xb0:
69 return
70 if which in self.control:
71 name = self.control[which]
72 if name.startswith("button-"):
73 value = value > 0
74 self.lastValue[name] = value
75 self.valueIn(name, value)
76 else:
77 print "unknown control %s to %s" % (which, value)
78
79 def reopen(self):
80 if self.dev is not None:
81 try:
82 self.dev.close()
83 except IOError:
84 pass
85
86 self.dev = open(self.devPath, "r+")
87 twisted.internet.fdesc.setNonBlocking(self.dev)
88
89 def valueIn(self, name, value):
90 """override this with your handler for when events come in
91 from the hardware"""
92 print "slider %s to %s" % (name, value)
93 if name == 'slider1':
94 for x in range(2,8+1):
95 v2 = int(64 + 64 * math.sin(x / 3 + value / 10))
96 self.valueOut('slider%d' % x, v2)
97 for x in range(1,8+1):
98 self.valueOut('button-upper%s' % x, value > x*15)
99 self.valueOut('button-lower%s' % x, value > (x*15+7))
100
101 def valueOut(self, name, value):
102 """call this to send an event to the hardware"""
103 value = int(value)
104 if self.lastValue.get(name) == value:
105 return
106 self.lastValue[name] = value
107 which = [k for k,v in self.control.items() if v == name]
108 assert len(which) == 1, "unknown control name %r" % name
109 if isinstance(value, bool):
110 value = value * 127
111 self.dev.write(chr(0xb0) + chr(which[0]) + chr(int(value)))
112
113
114 if __name__ == '__main__':
115 b = BCF2000()
116 reactor.run()