def _decode(self, destination_path=None):
"""
Transcode sourcefile to WAV file. By default use temporary WAV file
path, optionally transcode to provided path.
"""
if self.wavefile and os.path.exists(self.wavefile):
# WAV file already exists, no need to decode
if self.wavefile == destination_path:
return self.wavefile
else:
setup_dest_path(destination_path)
shutil.copy(self.wavefile, destination_path)
return destination_path
if not destination_path:
destination_path= tempfile.mkstemp(dir=TEMP_PREFIX)[1]
self.wave_temp = True
else:
setup_dest_path(destination_path)
self.wave_temp = False
if self.file_type in DECODE_TO_WAV:
command_line = DECODE_TO_WAV[self.file_type].substitute(sourcefile=self.sourcefile, \
wavefile=destination_path)
command_list = shlex.split(command_line)
with open('/dev/null', 'w') as DEVNULL:
returncode = subprocess.call(command_list, stdout=DEVNULL, stderr=DEVNULL)
if returncode == 0:
# If Successful
self.wavefile = os.path.abspath(destination_path)
return os.path.abspath(destination_path)
self.wave_temp = None
raise AudioSlaveException("Problem decoding wave file.")
def _get_dest_path(self, dest_format, destination_path=None):
"""
Returns a destination path for the transcoded file.
Ensures directories are created.
"""
if not destination_path:
# Use sourcefile path
destination_path = "%s.%s" % (os.path.splitext(self.sourcefile)[0], dest_format)
else:
if destination_path.endswith('/') or not destination_path.endswith(tuple(SUPPORTED_TYPES.keys())):
destination_path = "%s.%s" % (os.path.join(destination_path, os.path.splitext(os.path.split(self.sourcefile)[1])[0]), dest_format)
setup_dest_path(destination_path)
elif '/' in destination_path and destination_path.endswith(tuple(SUPPORTED_TYPES.keys())):
setup_dest_path(destination_path)
return destination_path
