def stretch(snd, length=None, speed=None, grain_size=20):
""" Crude granular time stretching and pitch shifting """
original_length = dsp.flen(snd)
if speed is not None:
snd = dsp.transpose(snd, speed)
current_length = dsp.flen(snd)
if original_length != current_length or length is not None:
grain_size = dsp.mstf(grain_size)
numgrains = length / (grain_size / 2)
numgrains = numgrains if numgrains > 0 else 1
block_size = current_length / numgrains
grains = []
original_position = 0
count = 0
while count <= numgrains:
grain = dsp.cut(snd, original_position, grain_size)
grains += [grain]
original_position += block_size
count += 1
snd = dsp.cross(grains, dsp.ftms(grain_size / 2))
return snd
def stretch(snd, length=None, speed=None, grain_size=20):
""" Crude granular time stretching and pitch shifting """
original_length = dsp.flen(snd)
if speed is not None:
snd = dsp.transpose(snd, speed)
current_length = dsp.flen(snd)
if original_length != current_length or length is not None:
grain_size = dsp.mstf(grain_size)
numgrains = length / (grain_size / 2)
numgrains = numgrains if numgrains > 0 else 1
block_size = current_length / numgrains
grains = []
original_position = 0
count = 0
while count <= numgrains:
grain = dsp.cut(snd, original_position, grain_size)
grains += [ grain ]
original_position += block_size
count += 1
snd = dsp.cross(grains, dsp.ftms(grain_size / 2))
return snd
def test_conversion(self):
self.assertEqual(dsp.stf(1), dsp.audio_params[2])
self.assertEqual(dsp.mstf(1000), dsp.stf(1))
self.assertEqual(dsp.mstf(1000), dsp.audio_params[2])
self.assertEqual(dsp.ftms(dsp.mstf(1000)), dsp.mstf(dsp.ftms(1000)))
