cmpaf.py :  » Language-Interface » ChinesePython » chinesepython2.1.3-0.4 » Demo » sgi » al » Python Open Source

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Python Open Source » Language Interface » ChinesePython 
ChinesePython » chinesepython2.1.3 0.4 » 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')

  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()
cmpaf.run()
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