def from_aiff(cls, filename, aiff_filename, compression=None, block_size=256, progress=None):
"""encodes a new AudioFile from an existing .aiff file
takes a filename string, aiff_filename string
of an existing WaveAudio file
and an optional compression level string
encodes a new audio file from the aiff's data
at the given filename with the specified compression level
and returns a new ShortenAudio object"""
aiff = AiffAudio(aiff_filename)
if aiff.bits_per_sample() not in (8, 16):
raise UnsupportedBitsPerSample(filename, aiff.bits_per_sample())
(head, tail) = aiff.pcm_split()
from .encoders import encode_shn
try:
if len(tail) == 0:
encode_shn(
filename=filename,
pcmreader=to_pcm_progress(aiff, progress),
is_big_endian=True,
signed_samples=True,
header_data=head,
block_size=block_size,
)
else:
encode_shn(
filename=filename,
pcmreader=to_pcm_progress(aiff, progress),
is_big_endian=True,
signed_samples=True,
header_data=head,
footer_data=tail,
block_size=block_size,
)
return cls(filename)
except IOError, err:
cls.__unlink__(filename)
raise EncodingError(str(err))
def from_aiff(cls, filename, aiff_filename, compression=None,
block_size=256, progress=None):
"""Encodes a new AudioFile from an existing .aiff file.
Takes a filename string, aiff_filename string
of an existing WaveAudio file
and an optional compression level string.
Encodes a new audio file from the aiff's data
at the given filename with the specified compression level
and returns a new ShortenAudio object."""
aiff = AiffAudio(aiff_filename)
if (aiff.bits_per_sample() not in (8, 16)):
raise UnsupportedBitsPerSample(filename, aiff.bits_per_sample())
(head, tail) = aiff.pcm_split()
if (len(tail) > 0):
blocks = [head, None, tail]
else:
blocks = [head, None]
import audiotools.encoders
try:
audiotools.encoders.encode_shn(
filename=filename,
pcmreader=to_pcm_progress(aiff, progress),
block_size=block_size,
file_type={8: 1, # 8-bit AIFF seems to be signed
16: 3}[aiff.bits_per_sample()],
verbatim_chunks=blocks)
return cls(filename)
except IOError, err:
cls.__unlink__(filename)
raise EncodingError(str(err))
