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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) | |