Initial revision

Demo/sgi/al/cmpaf.py

+# Compare different audio compression schemes.
+#
+# This copies mono audio data from the input port to the output port,
+# and puts up a window with 4 toggle buttons:
+#
+# uLAW       : convert the data to uLAW and back
+# ADPCM      : convert the data to ADPCM and back
+# Difference : make only the difference between the converted and the
+#              original data audible
+# Exit       : quit from the program
+
+import fl
+import FL
+import flp
+import al
+import AL
+import audioop
+import sys
+
+class Cmpaf():
+	def init(self):
+		parsetree = flp.parse_form('cmpaf_form','form')
+		flp.create_full_form(self, parsetree)
+		c = al.newconfig()
+		c.setchannels(AL.MONO)
+		c.setqueuesize(1800)
+		self.iport = al.openport('cmpaf','r', c)
+		self.oport = al.openport('cmpaf','w', c)
+		self.do_adpcm = self.do_ulaw = self.do_diff = 0
+		self.acstate = None
+		self.form.show_form(FL.PLACE_SIZE, 1, 'compare audio formats')
+		return self
+
+	def run(self):
+		while 1:
+			olddata = data = self.iport.readsamps(600)
+			if self.do_ulaw:
+				data = audioop.lin2ulaw(data, 2)
+				data = audioop.ulaw2lin(data, 2)
+			if self.do_adpcm:
+				data, nacstate = audioop.lin2adpcm(data, 2, \
+					  self.acstate)
+				data, dummy = audioop.adpcm2lin(data, 2, \
+					  self.acstate)
+				self.acstate = nacstate
+			if self.do_diff:
+				olddata = audioop.mul(olddata, 2, -1)
+				data = audioop.add(olddata, data, 2)
+			self.oport.writesamps(data)
+			fl.check_forms()
+
+	def cb_exit(self, *args):
+		sys.exit(0)
+
+	def cb_adpcm(self, obj, val):
+		self.do_adpcm = obj.get_button()
+
+	def cb_ulaw(self, obj, val):
+		self.do_ulaw = obj.get_button()
+
+	def cb_diff(self, obj, val):
+		self.do_diff = obj.get_button()
+
+cmpaf = Cmpaf().init()
+cmpaf.run()

Demo/sgi/al/cmpaf_form.fd

+Magic: 12321
+
+Internal Form Definition File
+    (do not change)
+
+Number of forms: 1
+
+=============== FORM ===============
+Name: form
+Width: 230.000000
+Height: 80.000000
+Number of Objects: 5
+
+--------------------
+class: 1
+type: 1
+box: 0.000000 0.000000 230.000000 80.000000
+boxtype: 1
+colors: 47 47
+alignment: 4
+style: 0
+size: 11.000000
+lcol: 0
+label: 
+name: 
+callback: 
+argument: 
+
+--------------------
+class: 12
+type: 1
+box: 10.000000 40.000000 100.000000 30.000000
+boxtype: 1
+colors: 39 3
+alignment: 4
+style: 0
+size: 11.000000
+lcol: 0
+label: uLAW
+name: ulawbutton
+callback: cb_ulaw
+argument: 0
+
+--------------------
+class: 12
+type: 1
+box: 10.000000 10.000000 100.000000 30.000000
+boxtype: 1
+colors: 39 3
+alignment: 4
+style: 0
+size: 11.000000
+lcol: 0
+label: ADPCM
+name: adpcm_button
+callback: cb_adpcm
+argument: 0
+
+--------------------
+class: 11
+type: 0
+box: 170.000000 10.000000 50.000000 20.000000
+boxtype: 1
+colors: 47 47
+alignment: 4
+style: 0
+size: 11.000000
+lcol: 0
+label: EXIT
+name: exit_button
+callback: cb_exit
+argument: 0
+
+--------------------
+class: 12
+type: 1
+box: 120.000000 40.000000 100.000000 30.000000
+boxtype: 1
+colors: 39 3
+alignment: 4
+style: 0
+size: 11.000000
+lcol: 0
+label: Difference
+name: diffbutton
+callback: cb_diff
+argument: 0
+
+==============================
+create_the_forms