--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/bcf2000.py	Sun Jun 10 07:41:48 2007 +0000
@@ -0,0 +1,116 @@
+#!/usr/bin/python
+from __future__ import division
+import math
+import twisted.internet.fdesc
+from twisted.internet import reactor
+from twisted.internet.task import LoopingCall
+
+class BCF2000(object):
+
+    control = {81 : "slider1", 82 : "slider2", 83 : "slider3", 84 : "slider4",
+               85 : "slider5", 86 : "slider6", 87 : "slider7", 88 : "slider8",
+
+                1 : "knob1",  2 : "knob2",  3 : "knob3",  4 : "knob4",
+                5 : "knob5",  6 : "knob6",  7 : "knob7",  8 : "knob8",
+
+               33 : "button-knob1", 34 : "button-knob2",
+               35 : "button-knob3", 36 : "button-knob4",
+               37 : "button-knob5", 38 : "button-knob6",
+               39 : "button-knob7", 40 : "button-knob8",
+               
+               65 : "button-upper1",  66 : "button-upper2",
+               67 : "button-upper3",  68 : "button-upper4",
+               69 : "button-upper5",  70 : "button-upper6",
+               71 : "button-upper7",  72 : "button-upper8",
+               73 : "button-lower1",  74 : "button-lower2",
+               75 : "button-lower3",  76 : "button-lower4",
+               77 : "button-lower5",  78 : "button-lower6",
+               79 : "button-lower7",  80 : "button-lower8",
+               89 : "button-corner1", 90 : "button-corner2",
+               91 : "button-corner3", 92 : "button-corner4",
+               }
+               
+    def __init__(self, dev="/dev/snd/midiC1D0"):
+        self.devPath = dev
+        self.dev = None
+        self.reopen()
+        self.lastValue = {} # control name : value
+        self.packet = ""
+        loop = LoopingCall(self.poll)
+        loop.start(.02)
+
+    def poll(self):
+        try:
+            bytes = self.dev.read(3)
+        except IOError, e:
+            return
+        if len(bytes) == 0:
+            print "midi stall, reopen slider device"
+            self.reopen()
+            return
+        self.packet += bytes
+        if len(self.packet) == 3:
+            p = self.packet
+            self.packet = ""
+            self.packetReceived(p)
+
+        return
+        
+        while 1:
+            packet = self.dev.read(3)
+            while len(packet) < 3:
+                if len(packet) == 0:
+                    self.reopen()
+                packet += self.dev.read(3 - len(packet))
+
+    def packetReceived(self, packet):
+        b0, which, value = [ord(b) for b in packet]
+        if b0 != 0xb0:
+            return
+        if which in self.control:
+            name = self.control[which]
+            if name.startswith("button-"):
+                value = value > 0
+            self.lastValue[name] = value
+            self.valueIn(name, value)
+        else:
+            print "unknown control %s to %s" % (which, value)
+
+    def reopen(self):
+        if self.dev is not None:
+            try:
+                self.dev.close()
+            except IOError:
+                pass
+
+        self.dev = open(self.devPath, "r+")
+        twisted.internet.fdesc.setNonBlocking(self.dev)
+                    
+    def valueIn(self, name, value):
+        """override this with your handler for when events come in
+        from the hardware"""
+        print "slider %s to %s" % (name, value)
+        if name == 'slider1':
+            for x in range(2,8+1):
+                v2 = int(64 + 64 * math.sin(x / 3 + value / 10))
+                self.valueOut('slider%d' % x, v2)
+            for x in range(1,8+1):
+                self.valueOut('button-upper%s' % x, value > x*15)
+                self.valueOut('button-lower%s' % x, value > (x*15+7))
+
+    def valueOut(self, name, value):
+        """call this to send an event to the hardware"""
+        value = int(value)
+        if self.lastValue.get(name) == value:
+            return
+        self.lastValue[name] = value
+        which = [k for k,v in self.control.items() if v == name]
+        assert len(which) == 1, "unknown control name %r" % name
+        if isinstance(value, bool):
+            value = value * 127
+        self.dev.write(chr(0xb0) + chr(which[0]) + chr(int(value)))
+        
+
+if __name__ == '__main__':
+    b = BCF2000()
+    reactor.run()