| 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 |
|
|
| |
| fd, infile = tempfile.mkstemp(suffix='.wav') |
| os.close(fd) |
| fd, outfile = tempfile.mkstemp(suffix='.wav') |
| os.close(fd) |
|
|
| |
| sf.write(infile, y, sr) |
|
|
| try: |
| |
| 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) |
|
|
| |
| y_out, _ = sf.read(outfile, always_2d=True) |
|
|
| |
| 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: |
| |
| 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) |
|
|