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import os
import subprocess
import tempfile
import six
import numpy as np
import soundfile as sf
import sys
if getattr(sys, 'frozen', False):
BASE_PATH_RUB = sys._MEIPASS
else:
BASE_PATH_RUB = os.path.dirname(os.path.abspath(__file__))
__all__ = ['time_stretch', 'pitch_shift']
__RUBBERBAND_UTIL = os.path.join(BASE_PATH_RUB, 'rubberband')
if six.PY2:
DEVNULL = open(os.devnull, 'w')
else:
DEVNULL = subprocess.DEVNULL
def __rubberband(y, sr, **kwargs):
assert sr > 0
# Get the input and output tempfile
fd, infile = tempfile.mkstemp(suffix='.wav')
os.close(fd)
fd, outfile = tempfile.mkstemp(suffix='.wav')
os.close(fd)
# dump the audio
sf.write(infile, y, sr)
try:
# Execute rubberband
arguments = [__RUBBERBAND_UTIL, '-q']
for key, value in six.iteritems(kwargs):
arguments.append(str(key))
arguments.append(str(value))
arguments.extend([infile, outfile])
subprocess.check_call(arguments, stdout=DEVNULL, stderr=DEVNULL)
# Load the processed audio.
y_out, _ = sf.read(outfile, always_2d=True)
# make sure that output dimensions matches input
if y.ndim == 1:
y_out = np.squeeze(y_out)
except OSError as exc:
six.raise_from(RuntimeError('Failed to execute rubberband. '
'Please verify that rubberband-cli '
'is installed.'),
exc)
finally:
# Remove temp files
os.unlink(infile)
os.unlink(outfile)
return y_out
def time_stretch(y, sr, rate, rbargs=None):
if rate <= 0:
raise ValueError('rate must be strictly positive')
if rate == 1.0:
return y
if rbargs is None:
rbargs = dict()
rbargs.setdefault('--tempo', rate)
return __rubberband(y, sr, **rbargs)
def pitch_shift(y, sr, n_steps, rbargs=None):
if n_steps == 0:
return y
if rbargs is None:
rbargs = dict()
rbargs.setdefault('--pitch', n_steps)
return __rubberband(y, sr, **rbargs)
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