def ApplyChanges(self, from_time=None, to_time=None):
"""
Return a channel with changed applied.
@param from_time (float)
@param to_time (float)
@return (Channel) new channel or None if nothing changed
"""
# Get the list of modifiable values from wx objects
fm = int(self._wxobj["framerate"][1].GetValue())
sp = int(int(self._wxobj["sampwidth"][1].GetValue())/8)
mul = float(self._wxobj["mul"][1].GetValue())
bias = int(self._wxobj["bias"][1].GetValue())
offset = self._wxobj["offset"][1].GetValue()
dirty = False
if from_time is None:
from_frame = 0
else:
from_frame = int( from_time * fm )
dirty = True
if to_time is None:
to_frame = self._channel.get_nframes()
else:
dirty = True
to_frame = int(to_time * fm)
channel = self._channel.extract_fragment(from_frame,to_frame)
# If something changed, apply this/these change-s to the channel
if fm != self._channel.get_framerate() or sp != self._channel.get_sampwidth() or mul != 1. or bias != 0 or offset is True:
wx.BeginBusyCursor()
b = wx.BusyInfo("Please wait while formatting data...")
channelfmt = ChannelFormatter( channel )
channelfmt.set_framerate(fm)
channelfmt.set_sampwidth(sp)
channelfmt.convert()
channelfmt.mul(mul)
channelfmt.bias(bias)
if offset is True:
channelfmt.remove_offset()
channel = channelfmt.get_channel()
dirty = True
b.Destroy()
b = None
wx.EndBusyCursor()
if dirty is True:
return channel
return None
if args.r:
formatter.set_framerate(args.r)
else:
formatter.set_framerate(audio.get_framerate())
if args.b:
if not args.b in [1,2,4]:
print "Wrong bitrate value"
sys.exit(1)
formatter.set_sampwidth(args.b)
else:
formatter.set_sampwidth(audio.get_sampwidth())
formatter.convert()
# no more need of input data, can close
audio.close()
if args.m:
formatter.mul(args.m)
if args.b:
formatter.bias(args.b)
# Save the converted channel
audio_out = AudioPCM()
audio_out.append_channel( formatter.channel )
audiodata.save( args.o, audio_out )
# ----------------------------------------------------------------------------