def test_CreateSilence(self):
self._sample_1.extract_channel(0)
self._sample_2.extract_channel(0)
channel = self._sample_1.get_channel(0)
monofrag = MonoFragment(channel.frames)
monofrag.create_silence(1000)
self.assertEqual(channel.get_nframes()+1000, len(monofrag.get_frames())/channel.get_sampwidth())
def equalize(self):
"""
Equalize the number of frames of all the channels by appending silence at the end.
"""
nframes = 0
for i in xrange(len(self.channels)):
nframes = max(nframes, self.channels[i].get_nframes())
for i in xrange(len(self.channels)):
if self.channels[i].get_nframes() < nframes:
fragment = MonoFragment(self.channels[i].frames)
fragment.create_silence(nframes - self.channels[i].get_nframes())
self.channels[i] = Channel(self.channels[i].get_framerate(), self.channels[i].get_sampwidth(), fragment.get_frames())
def __convert_frames(self, frames):
"""
Convert frames to the expected sample width and frame rate.
@param frames (string) the frames to convert
"""
f = frames
fragment = MonoFragment(f)
#Convert the sample width if it needs to
if (self.channel.get_sampwidth() != self.sampwidth):
fragment.changesampwidth(self.channel.get_sampwidth(), self.sampwidth)
#Convert the self.framerate if it needs to
if (self.channel.get_framerate() != self.framerate):
fragment.resample(self.sampwidth, self.channel.get_framerate(), self.framerate)
return fragment.get_frames()
