def undo(self, new_file):
"""updates new_file to its original state,
if present in the undo database"""
undo_checksum = OldUndoDB.checksum(new_file)
if (undo_checksum in self.db.keys()):
# copy the xdelta to a temporary file
xdelta_f = tempfile.NamedTemporaryFile(suffix=".delta")
xdelta_f.write(self.db[undo_checksum])
xdelta_f.flush()
# patch the existing track to a temporary track
old_track = tempfile.NamedTemporaryFile()
try:
if (subprocess.call([BIN["xdelta"],
"patch",
xdelta_f.name,
new_file,
old_track.name]) == 0):
# copy the temporary track over the existing file
f1 = open(old_track.name, 'rb')
f2 = open(new_file, 'wb')
transfer_data(f1.read, f2.write)
f1.close()
f2.close()
return True
else:
raise IOError("error performing xdelta operation")
finally:
old_track.close()
xdelta_f.close()
else:
return False
def delete_metadata(self):
"""deletes the track's MetaData
this removes or unsets tags as necessary in order to remove all data
raises IOError if unable to write the file"""
import os
from audiotools import (TemporaryFile, LimitedFileReader,
transfer_data)
#this works a lot like update_metadata
#but without any new metadata to set
if (not os.access(self.filename, os.W_OK)):
raise IOError(self.filename)
new_mp3 = TemporaryFile(self.filename)
#get the original MP3 data
old_mp3 = open(self.filename, "rb")
MP3Audio.__find_last_mp3_frame__(old_mp3)
data_end = old_mp3.tell()
old_mp3.seek(0, 0)
MP3Audio.__find_mp3_start__(old_mp3)
data_start = old_mp3.tell()
old_mp3 = LimitedFileReader(old_mp3, data_end - data_start)
#write data to file
transfer_data(old_mp3.read, new_mp3.write)
#commit change to disk
old_mp3.close()
new_mp3.close()
def delete_metadata(self):
"""deletes the track's MetaData
this removes or unsets tags as necessary in order to remove all data
raises IOError if unable to write the file"""
import os
from audiotools import (transfer_data,
LimitedFileReader,
TemporaryFile)
from audiotools.id3 import skip_id3v2_comment
if (not os.access(self.filename, os.W_OK)):
raise IOError(self.filename)
# overwrite original with no tags attached
old_tta = open(self.filename, "rb")
skip_id3v2_comment(old_tta)
old_tta = LimitedFileReader(old_tta, self.data_size())
new_tta = TemporaryFile(self.filename)
transfer_data(old_tta.read, new_tta.write)
old_tta.close()
new_tta.close()
def delete_metadata(self):
"""deletes the track's MetaData
this removes or unsets tags as necessary in order to remove all data
raises IOError if unable to write the file"""
import os
from audiotools import (transfer_data,
LimitedFileReader,
TemporaryFile)
from audiotools.id3 import skip_id3v2_comment
if (not os.access(self.filename, os.W_OK)):
raise IOError(self.filename)
# overwrite original with no tags attached
old_tta = open(self.filename, "rb")
skip_id3v2_comment(old_tta)
old_tta = LimitedFileReader(old_tta, self.data_size())
new_tta = TemporaryFile(self.filename)
transfer_data(old_tta.read, new_tta.write)
old_tta.close()
new_tta.close()
def add(self, old_file, new_file):
"""adds an undo entry for transforming new_file to old_file
both are filename strings"""
from io import BytesIO
# perform xdelta between old and new track to temporary file
delta_f = tempfile.NamedTemporaryFile(suffix=".delta")
try:
if (subprocess.call([BIN["xdelta"],
"delta",
new_file, old_file, delta_f.name]) != 2):
# store the xdelta in our internal db
f = open(delta_f.name, 'rb')
data = BytesIO()
transfer_data(f.read, data.write)
f.close()
self.db[OldUndoDB.checksum(new_file)] = data.getvalue()
else:
raise IOError("error performing xdelta operation")
finally:
delta_f.close()
def add(self, old_file, new_file):
"""adds an undo entry for transforming new_file to old_file
both are filename strings"""
from io import BytesIO
# perform xdelta between old and new track to temporary file
delta_f = tempfile.NamedTemporaryFile(suffix=".delta")
try:
if (subprocess.call([
BIN["xdelta"], "delta", new_file, old_file, delta_f.name
]) != 2):
# store the xdelta in our internal db
f = open(delta_f.name, 'rb')
data = BytesIO()
transfer_data(f.read, data.write)
f.close()
self.db[OldUndoDB.checksum(new_file)] = data.getvalue()
else:
raise IOError("error performing xdelta operation")
finally:
delta_f.close()
def to_wave(self, wave_filename):
"""writes the contents of this file to the given .wav filename string
raises EncodingError if some error occurs during decoding"""
from audiotools import BIN
from audiotools import transfer_data
import subprocess
import os
if (self.filename.endswith(".ape")):
devnull = open(os.devnull, "wb")
sub = subprocess.Popen(
[BIN['mac'], self.filename, wave_filename, '-d'],
stdout=devnull,
stderr=devnull)
sub.wait()
devnull.close()
else:
devnull = open(os.devnull, 'ab')
import tempfile
ape = tempfile.NamedTemporaryFile(suffix='.ape')
f = open(self.filename, 'rb')
transfer_data(f.read, ape.write)
f.close()
ape.flush()
sub = subprocess.Popen([BIN['mac'], ape.name, wave_filename, '-d'],
stdout=devnull,
stderr=devnull)
sub.wait()
ape.close()
devnull.close()
def delete_metadata(self):
"""Deletes the track's MetaData.
This removes or unsets tags as necessary in order to remove all data.
Raises IOError if unable to write the file."""
import tempfile
new_aiff = tempfile.TemporaryFile()
new_aiff.seek(12, 0)
for (chunk_id, chunk_length, chunk_file) in self.chunk_files():
if (chunk_id != 'ID3 '):
new_aiff.write(
self.CHUNK_HEADER.build(
Con.Container(chunk_id=chunk_id,
chunk_length=chunk_length)))
transfer_data(chunk_file.read, new_aiff.write)
header = Con.Container(aiff_id='FORM',
aiff_size=new_aiff.tell() - 8,
aiff_type='AIFF')
new_aiff.seek(0, 0)
new_aiff.write(self.AIFF_HEADER.build(header))
new_aiff.seek(0, 0)
f = open(self.filename, 'wb')
transfer_data(new_aiff.read, f.write)
new_aiff.close()
f.close()
def undo_from_backup(track, undo_db, messenger):
undo_checksum = checksum(track.filename)
if (undo_db.has_key(undo_checksum)):
#copy the xdelta to a temporary file
xdelta_f = tempfile.NamedTemporaryFile(suffix=".delta")
xdelta_f.write(undo_db[undo_checksum])
xdelta_f.flush()
#patch the existing track to a temporary track
old_track = tempfile.NamedTemporaryFile(suffix="." + track.SUFFIX)
if (subprocess.call([
audiotools.BIN["xdelta"], "patch", xdelta_f.name,
track.filename, old_track.name
]) == 0):
#copy the temporary track over the existing file
f1 = open(old_track.name, 'rb')
f2 = open(track.filename, 'wb')
audiotools.transfer_data(f1.read, f2.write)
f1.close()
f2.close()
old_track.close()
xdelta_f.close()
messenger.info(_(u"Restored: %s") % \
(messenger.filename(track.filename)))
def delete_metadata(self):
"""Deletes the track's MetaData.
This removes or unsets tags as necessary in order to remove all data.
Raises IOError if unable to write the file."""
def chunk_filter(chunks):
for (chunk_id, chunk_size, chunk_data) in chunks:
if (chunk_id == 'ID3 '):
continue
else:
yield (chunk_id, chunk_size, chunk_data)
import tempfile
import tempfile
new_aiff = tempfile.NamedTemporaryFile(suffix=self.SUFFIX)
self.__class__.aiff_from_chunks(new_aiff.name,
chunk_filter(self.chunks()))
new_file = open(new_aiff.name, 'rb')
old_file = open(self.filename, 'wb')
transfer_data(new_file.read, old_file.write)
old_file.close()
new_file.close()
def fix_id3_preserve_originals(self, tempFilePath):
f = file(self.filename, 'rb')
#figure out where the start and end points of the FLAC file are
audiotools.ID3v2Comment.skip(f)
flac_start = f.tell()
f.seek(-128, 2)
if (f.read(3) == 'TAG'):
f.seek(-3, 1)
flac_end = f.tell()
else:
f.seek(0, 2)
flac_end = f.tell()
#copy the FLAC data to a temporary location
temp = tempfile.TemporaryFile()
f.seek(flac_start, 0)
reader = audiotools.__capped_stream_reader__(f, flac_end - flac_start)
audiotools.transfer_data(reader.read, temp.write)
#rewrite the original FLAC with our temporary data
temp.seek(0, 0)
f.close()
f = file(tempFilePath, 'wb')
audiotools.transfer_data(temp.read, f.write)
temp.close()
f.close()
returnValue = audiotools.open(tempFilePath)
return returnValue
def delete_metadata(self):
"""Deletes the track's MetaData.
This removes or unsets tags as necessary in order to remove all data.
Raises IOError if unable to write the file."""
import tempfile
new_aiff = tempfile.TemporaryFile()
new_aiff.seek(12, 0)
for (chunk_id, chunk_length, chunk_file) in self.chunk_files():
if (chunk_id != 'ID3 '):
new_aiff.write(self.CHUNK_HEADER.build(
Con.Container(chunk_id=chunk_id,
chunk_length=chunk_length)))
transfer_data(chunk_file.read, new_aiff.write)
header = Con.Container(
aiff_id='FORM',
aiff_size=new_aiff.tell() - 8,
aiff_type='AIFF')
new_aiff.seek(0, 0)
new_aiff.write(self.AIFF_HEADER.build(header))
new_aiff.seek(0, 0)
f = open(self.filename, 'wb')
transfer_data(new_aiff.read, f.write)
new_aiff.close()
f.close()
def delete_metadata(self):
"""deletes the track's MetaData
this removes or unsets tags as necessary in order to remove all data
raises IOError if unable to write the file"""
import os
from audiotools import (TemporaryFile,
LimitedFileReader,
transfer_data)
#this works a lot like update_metadata
#but without any new metadata to set
if (not os.access(self.filename, os.W_OK)):
raise IOError(self.filename)
new_mp3 = TemporaryFile(self.filename)
#get the original MP3 data
old_mp3 = open(self.filename, "rb")
MP3Audio.__find_last_mp3_frame__(old_mp3)
data_end = old_mp3.tell()
old_mp3.seek(0, 0)
MP3Audio.__find_mp3_start__(old_mp3)
data_start = old_mp3.tell()
old_mp3 = LimitedFileReader(old_mp3, data_end - data_start)
#write data to file
transfer_data(old_mp3.read, new_mp3.write)
#commit change to disk
old_mp3.close()
new_mp3.close()
def undo(self, new_file):
"""Updates new_file to its original state,
if present in the undo database."""
undo_checksum = OldUndoDB.checksum(new_file)
if (undo_checksum in self.db.keys()):
#copy the xdelta to a temporary file
xdelta_f = tempfile.NamedTemporaryFile(suffix=".delta")
xdelta_f.write(self.db[undo_checksum])
xdelta_f.flush()
#patch the existing track to a temporary track
old_track = tempfile.NamedTemporaryFile()
try:
if (subprocess.call([
BIN["xdelta"], "patch", xdelta_f.name, new_file,
old_track.name
]) == 0):
#copy the temporary track over the existing file
f1 = open(old_track.name, 'rb')
f2 = open(new_file, 'wb')
transfer_data(f1.read, f2.write)
f1.close()
f2.close()
return True
else:
raise IOError("error performing xdelta operation")
finally:
old_track.close()
xdelta_f.close()
else:
return False
def to_wave(self, wave_filename):
"""Writes the contents of this file to the given .wav filename string.
Raises EncodingError if some error occurs during decoding."""
if (self.filename.endswith(".ape")):
devnull = file(os.devnull, "wb")
sub = subprocess.Popen([BIN['mac'],
self.filename,
wave_filename,
'-d'],
stdout=devnull,
stderr=devnull)
sub.wait()
devnull.close()
else:
devnull = file(os.devnull, 'ab')
import tempfile
ape = tempfile.NamedTemporaryFile(suffix='.ape')
f = file(self.filename, 'rb')
transfer_data(f.read, ape.write)
f.close()
ape.flush()
sub = subprocess.Popen([BIN['mac'],
ape.name,
wave_filename,
'-d'],
stdout=devnull,
stderr=devnull)
sub.wait()
ape.close()
devnull.close()
def __help_output__(cls):
import cStringIO
help_data = cStringIO.StringIO()
sub = subprocess.Popen([BIN['lame'],'--help'],
stdout=subprocess.PIPE)
transfer_data(sub.stdout.read,help_data.write)
sub.wait()
return help_data.getvalue()
def checksum(path):
f = open(path, "rb")
c = sha1("")
try:
audiotools.transfer_data(f.read, c.update)
return c.hexdigest()
finally:
f.close()
def __help_output__(cls):
import cStringIO
help_data = cStringIO.StringIO()
sub = subprocess.Popen([BIN['lame'], '--help'],
stdout=subprocess.PIPE)
transfer_data(sub.stdout.read, help_data.write)
sub.wait()
return help_data.getvalue()
def to_pcm(self):
#if mpg123 is available, use that for decoding
if (BIN.can_execute(BIN["mpg123"])):
sub = subprocess.Popen([BIN["mpg123"],"-qs",self.filename],
stdout=subprocess.PIPE,
stderr=file(os.devnull,"a"))
return PCMReader(sub.stdout,
sample_rate=self.sample_rate(),
channels=self.channels(),
bits_per_sample=16,
channel_mask=int(ChannelMask.from_channels(self.channels())),
process=sub,
big_endian=BIG_ENDIAN)
else:
#if not, use LAME for decoding
if (self.filename.endswith("." + self.SUFFIX)):
if (BIG_ENDIAN):
endian = ['-x']
else:
endian = []
sub = subprocess.Popen([BIN['lame']] + endian + \
["--decode","-t","--quiet",
self.filename,"-"],
stdout=subprocess.PIPE)
return PCMReader(sub.stdout,
sample_rate=self.sample_rate(),
channels=self.channels(),
bits_per_sample=16,
channel_mask=int(ChannelMask.from_channels(self.channels())),
process=sub)
else:
import tempfile
from audiotools import TempWaveReader
#copy our file to one that ends with .mp3
tempmp3 = tempfile.NamedTemporaryFile(suffix='.' + self.SUFFIX)
f = open(self.filename,'rb')
transfer_data(f.read,tempmp3.write)
f.close()
tempmp3.flush()
#decode the mp3 file to a WAVE file
wave = tempfile.NamedTemporaryFile(suffix='.wav')
returnval = subprocess.call([BIN['lame'],"--decode","--quiet",
tempmp3.name,wave.name])
tempmp3.close()
if (returnval == 0):
#return WAVE file as a stream
wave.seek(0,0)
return TempWaveReader(wave)
else:
return PCMReaderError(None,
sample_rate=self.sample_rate(),
channels=self.channels(),
bits_per_sample=16)
def checksum(cls, filename):
"""Returns the SHA1 checksum of the filename's contents."""
f = open(filename, "rb")
c = sha1("")
try:
transfer_data(f.read, c.update)
return c.hexdigest()
finally:
f.close()
def checksum(cls, filename):
"""returns the SHA1 checksum of the filename's contents"""
f = open(filename, "rb")
c = sha1("")
try:
transfer_data(f.read, c.update)
return c.hexdigest()
finally:
f.close()
def clean(self, output_filename=None):
"""cleans the file of known data and metadata problems
output_filename is an optional filename of the fixed file
if present, a new AudioFile is written to that path
otherwise, only a dry-run is performed and no new file is written
return list of fixes performed as Unicode strings
raises IOError if unable to write the file or its metadata
raises ValueError if the file has errors of some sort
"""
from audiotools.id3 import total_id3v2_comments
from audiotools import transfer_data
from audiotools import open as open_audiofile
from audiotools.text import CLEAN_REMOVE_DUPLICATE_ID3V2
with open(self.filename, "rb") as f:
if total_id3v2_comments(f) > 1:
file_fixes = [CLEAN_REMOVE_DUPLICATE_ID3V2]
else:
file_fixes = []
if output_filename is None:
# dry run only
metadata = self.get_metadata()
if metadata is not None:
(metadata, fixes) = metadata.clean()
return file_fixes + fixes
else:
return file_fixes
else:
# perform complete fix
input_f = open(self.filename, "rb")
output_f = open(output_filename, "wb")
try:
transfer_data(input_f.read, output_f.write)
finally:
input_f.close()
output_f.close()
new_track = open_audiofile(output_filename)
metadata = self.get_metadata()
if metadata is not None:
(metadata, fixes) = metadata.clean()
if len(file_fixes + fixes) > 0:
# only update metadata if fixes are actually performed
new_track.update_metadata(metadata)
return file_fixes + fixes
else:
return file_fixes
def clean(self, output_filename=None):
"""cleans the file of known data and metadata problems
output_filename is an optional filename of the fixed file
if present, a new AudioFile is written to that path
otherwise, only a dry-run is performed and no new file is written
return list of fixes performed as Unicode strings
raises IOError if unable to write the file or its metadata
raises ValueError if the file has errors of some sort
"""
from audiotools.id3 import total_id3v2_comments
from audiotools import open as open_audiofile
from audiotools import transfer_data
from audiotools.text import CLEAN_REMOVE_DUPLICATE_ID3V2
with open(self.filename, "rb") as f:
if (total_id3v2_comments(f) > 1):
file_fixes = [CLEAN_REMOVE_DUPLICATE_ID3V2]
else:
file_fixes = []
if (output_filename is None):
# dry run only
metadata = self.get_metadata()
if (metadata is not None):
(metadata, fixes) = metadata.clean()
return file_fixes + fixes
else:
return []
else:
# perform full fix
input_f = open(self.filename, "rb")
output_f = open(output_filename, "wb")
try:
transfer_data(input_f.read, output_f.write)
finally:
input_f.close()
output_f.close()
new_track = open_audiofile(output_filename)
metadata = self.get_metadata()
if (metadata is not None):
(metadata, fixes) = metadata.clean()
if (len(file_fixes + fixes) > 0):
# only update metadata if fixes are actually performed
new_track.update_metadata(metadata)
return file_fixes + fixes
else:
return []
def set_metadata(self, metadata):
"""Takes a MetaData object and sets this track's metadata.
This metadata includes track name, album name, and so on.
Raises IOError if unable to write the file."""
if (metadata is None):
return
import tempfile
id3_chunk = ID3v22Comment.converted(metadata).build()
new_aiff = tempfile.TemporaryFile()
new_aiff.seek(12, 0)
id3_found = False
for (chunk_id, chunk_length, chunk_file) in self.chunk_files():
if (chunk_id != 'ID3 '):
new_aiff.write(
self.CHUNK_HEADER.build(
Con.Container(chunk_id=chunk_id,
chunk_length=chunk_length)))
transfer_data(chunk_file.read, new_aiff.write)
else:
new_aiff.write(
self.CHUNK_HEADER.build(
Con.Container(chunk_id='ID3 ',
chunk_length=len(id3_chunk))))
new_aiff.write(id3_chunk)
id3_found = True
if (not id3_found):
new_aiff.write(
self.CHUNK_HEADER.build(
Con.Container(chunk_id='ID3 ',
chunk_length=len(id3_chunk))))
new_aiff.write(id3_chunk)
header = Con.Container(aiff_id='FORM',
aiff_size=new_aiff.tell() - 8,
aiff_type='AIFF')
new_aiff.seek(0, 0)
new_aiff.write(self.AIFF_HEADER.build(header))
new_aiff.seek(0, 0)
f = open(self.filename, 'wb')
transfer_data(new_aiff.read, f.write)
new_aiff.close()
f.close()
def set_metadata(self, metadata):
"""Takes a MetaData object and sets this track's metadata.
This metadata includes track name, album name, and so on.
Raises IOError if unable to write the file."""
if (metadata is None):
return
import tempfile
id3_chunk = ID3v22Comment.converted(metadata).build()
new_aiff = tempfile.TemporaryFile()
new_aiff.seek(12, 0)
id3_found = False
for (chunk_id, chunk_length, chunk_file) in self.chunk_files():
if (chunk_id != 'ID3 '):
new_aiff.write(self.CHUNK_HEADER.build(
Con.Container(chunk_id=chunk_id,
chunk_length=chunk_length)))
transfer_data(chunk_file.read, new_aiff.write)
else:
new_aiff.write(self.CHUNK_HEADER.build(
Con.Container(chunk_id='ID3 ',
chunk_length=len(id3_chunk))))
new_aiff.write(id3_chunk)
id3_found = True
if (not id3_found):
new_aiff.write(self.CHUNK_HEADER.build(
Con.Container(chunk_id='ID3 ',
chunk_length=len(id3_chunk))))
new_aiff.write(id3_chunk)
header = Con.Container(
aiff_id='FORM',
aiff_size=new_aiff.tell() - 8,
aiff_type='AIFF')
new_aiff.seek(0, 0)
new_aiff.write(self.AIFF_HEADER.build(header))
new_aiff.seek(0, 0)
f = open(self.filename, 'wb')
transfer_data(new_aiff.read, f.write)
new_aiff.close()
f.close()
def _checksum_track_audiotools(
self, track: cd.Track) -> Dict[int, AccurateRipTrackID1]:
file = audiotools.open(self._wav)
# just doublechecking
if not isinstance(file, audiotools.WaveAudio) \
or not file.supports_to_pcm() \
or file.channels() != 2 \
or file.sample_rate() != cd.CDA_SAMLES_PER_SEC \
or file.bits_per_sample() != cd.CDA_BITS_PER_SAMPLE:
raise AccurateRipException(
"Input file doesn't look like a CDA rip")
# most of this is taken from https://github.com/tuffy/python-audio-tools/blob/master/trackverify#L244
reader = file.to_pcm()
if not hasattr(reader, "seek") or not callable(reader.seek):
raise AccurateRipException("Can't seek in file")
# we start reading a bit before the track, in order to try out different offsets for the accuraterip checksums
# the reader below will take care of padding if this is negative
offset = track.first_sample - self.PREVIOUS_TRACK_FRAMES
if offset > 0:
offset -= reader.seek(offset)
checksummer = audiotools.accuraterip.Checksum(
total_pcm_frames=track.length_samples,
sample_rate=cd.CDA_SAMLES_PER_SEC,
is_first=track.is_first,
is_last=track.is_last,
pcm_frame_range=self.PREVIOUS_TRACK_FRAMES + 1 +
self.NEXT_TRACK_FRAMES,
accurateripv2_offset=self.PREVIOUS_TRACK_FRAMES)
window_reader = audiotools.PCMReaderWindow(
reader, offset, self.PREVIOUS_TRACK_FRAMES + track.length_samples +
self.NEXT_TRACK_FRAMES)
audiotools.transfer_data(window_reader.read, checksummer.update)
checksums_v1 = checksummer.checksums_v1()
crc1_by_offset: Dict[int, AccurateRipTrackID1] = {
i: AccurateRipTrackID1(c)
for i, c in enumerate(checksums_v1, -self.PREVIOUS_TRACK_FRAMES)
}
return crc1_by_offset
def delete_metadata(self):
"""Deletes the track's MetaData.
Raises IOError if unable to write the file."""
from .bitstream import BitstreamReader, BitstreamWriter
f = file(self.filename, "r+b")
f.seek(-32, 2)
(preamble,
version,
tag_size,
item_count,
read_only,
item_encoding,
is_header,
no_footer,
has_header) = BitstreamReader(f, 1).parse(ApeTag.HEADER_FORMAT)
if ((preamble == 'APETAGEX') and (version == 2000)):
#there's existing metadata to delete
#so rewrite file without trailing metadata tag
if (has_header):
old_tag_size = 32 + tag_size
else:
old_tag_size = tag_size
import tempfile
from os.path import getsize
rewritten = tempfile.TemporaryFile()
#copy everything but the last "old_tag_size" bytes
#from existing file to rewritten file
f = open(self.filename, "rb")
limited_transfer_data(f.read, rewritten.write,
os.path.getsize(self.filename) -
old_tag_size)
f.close()
#finally, overwrite current file with rewritten file
rewritten.seek(0, 0)
f = open(self.filename, "wb")
transfer_data(rewritten.read, f.write)
f.close()
rewritten.close()
def __from_wave__(cls, filename, wave_filename, compression=None):
if (str(compression) not in cls.COMPRESSION_MODES):
compression = cls.DEFAULT_COMPRESSION
#mppenc requires files to end with .mpc for some reason
if (not filename.endswith(".mpc")):
import tempfile
actual_filename = filename
tempfile = tempfile.NamedTemporaryFile(suffix=".mpc")
filename = tempfile.name
else:
actual_filename = tempfile = None
###Musepack SV7###
#sub = subprocess.Popen([BIN['mppenc'],
# "--silent",
# "--overwrite",
# "--%s" % (compression),
# wave_filename,
# filename],
# preexec_fn=ignore_sigint)
###Musepack SV8###
sub = subprocess.Popen([BIN['mpcenc'],
"--silent",
"--overwrite",
"--%s" % (compression),
wave_filename,
filename])
if (sub.wait() == 0):
if (tempfile is not None):
filename = actual_filename
f = file(filename, 'wb')
tempfile.seek(0, 0)
transfer_data(tempfile.read, f.write)
f.close()
tempfile.close()
return MusepackAudio(filename)
else:
if (tempfile is not None):
tempfile.close()
raise EncodingError(u"error encoding file with mpcenc")
def set_metadata(self, metadata):
if (metadata is None):
return
import tempfile
id3_chunk = ID3v22Comment.converted(metadata).build()
new_aiff = tempfile.TemporaryFile()
new_aiff.seek(12, 0)
id3_found = False
for (chunk_id, chunk_length, chunk_file) in self.chunk_files():
if (chunk_id != 'ID3 '):
new_aiff.write(
self.CHUNK_HEADER.build(
construct.Container(chunk_id=chunk_id,
chunk_length=chunk_length)))
transfer_data(chunk_file.read, new_aiff.write)
else:
new_aiff.write(
self.CHUNK_HEADER.build(
construct.Container(chunk_id='ID3 ',
chunk_length=len(id3_chunk))))
new_aiff.write(id3_chunk)
id3_found = True
if (not id3_found):
new_aiff.write(
self.CHUNK_HEADER.build(
construct.Container(chunk_id='ID3 ',
chunk_length=len(id3_chunk))))
new_aiff.write(id3_chunk)
header = construct.Container(aiff_id='FORM',
aiff_size=new_aiff.tell() - 8,
aiff_type='AIFF')
new_aiff.seek(0, 0)
new_aiff.write(self.AIFF_HEADER.build(header))
new_aiff.seek(0, 0)
f = open(self.filename, 'wb')
transfer_data(new_aiff.read, f.write)
new_aiff.close()
f.close()
def __from_wave__(cls, filename, wave_filename, compression=None):
if (str(compression) not in cls.COMPRESSION_MODES):
compression = cls.DEFAULT_COMPRESSION
#mppenc requires files to end with .mpc for some reason
if (not filename.endswith(".mpc")):
import tempfile
actual_filename = filename
tempfile = tempfile.NamedTemporaryFile(suffix=".mpc")
filename = tempfile.name
else:
actual_filename = tempfile = None
###Musepack SV7###
#sub = subprocess.Popen([BIN['mppenc'],
# "--silent",
# "--overwrite",
# "--%s" % (compression),
# wave_filename,
# filename],
# preexec_fn=ignore_sigint)
###Musepack SV8###
sub = subprocess.Popen([BIN['mpcenc'],
"--silent",
"--overwrite",
"--%s" % (compression),
wave_filename,
filename])
if (sub.wait() == 0):
if (tempfile is not None):
filename = actual_filename
f = file(filename, 'wb')
tempfile.seek(0, 0)
transfer_data(tempfile.read, f.write)
f.close()
tempfile.close()
return MusepackAudio(filename)
else:
if (tempfile is not None):
tempfile.close()
raise EncodingError(u"error encoding file with mpcenc")
def update_metadata(self, metadata):
"""takes this track's current MetaData object
as returned by get_metadata() and sets this track's metadata
with any fields updated in that object
raises IOError if unable to write the file
"""
import tempfile
from .bitstream import BitstreamRecorder
if (metadata is None):
return
elif (not isinstance(metadata, ID3v22Comment)):
raise ValueError(_(u"metadata not from audio file"))
def chunk_filter(chunks, id3_chunk_data):
for chunk in chunks:
if (chunk.id == "ID3 "):
yield AIFF_Chunk("ID3 ",
len(id3_chunk_data),
id3_chunk_data)
else:
yield chunk
#turn our ID3v2.2 tag into a raw binary chunk
id3_chunk = BitstreamRecorder(0)
metadata.build(id3_chunk)
id3_chunk = id3_chunk.data()
#generate a temporary AIFF file in which our new ID3v2.2 chunk
#replaces the existing ID3v2.2 chunk
new_aiff = tempfile.NamedTemporaryFile(suffix=self.SUFFIX)
self.__class__.aiff_from_chunks(new_aiff.name,
chunk_filter(self.chunks(),
id3_chunk))
#replace the existing file with data from the temporary file
new_file = open(new_aiff.name, 'rb')
old_file = open(self.filename, 'wb')
transfer_data(new_file.read, old_file.write)
old_file.close()
new_file.close()
def set_metadata(self, metadata):
"""takes a MetaData object and sets this track's metadata
this metadata includes track name, album name, and so on
raises IOError if unable to write the file"""
if (metadata is None):
return
elif (self.get_metadata() is not None):
#current file has metadata, so replace it with new metadata
self.update_metadata(ID3v22Comment.converted(metadata))
else:
#current file has no metadata, so append new ID3 block
import tempfile
from .bitstream import BitstreamRecorder
def chunk_filter(chunks, id3_chunk_data):
for chunk in chunks:
yield chunk
yield AIFF_Chunk("ID3 ",
len(id3_chunk_data),
id3_chunk_data)
#turn our ID3v2.2 tag into a raw binary chunk
id3_chunk = BitstreamRecorder(0)
ID3v22Comment.converted(metadata).build(id3_chunk)
id3_chunk = id3_chunk.data()
#generate a temporary AIFF file in which our new ID3v2.2 chunk
#is appended to the file's set of chunks
new_aiff = tempfile.NamedTemporaryFile(suffix=self.SUFFIX)
self.__class__.aiff_from_chunks(new_aiff.name,
chunk_filter(self.chunks(),
id3_chunk))
#replace the existing file with data from the temporary file
new_file = open(new_aiff.name, 'rb')
old_file = open(self.filename, 'wb')
transfer_data(new_file.read, old_file.write)
old_file.close()
new_file.close()
def to_wave(self, wave_filename):
if (self.filename.endswith(".ape")):
devnull = file(os.devnull, "wb")
sub = subprocess.Popen(
[BIN['mac'], self.filename, wave_filename, '-d'],
stdout=devnull,
stderr=devnull)
sub.wait()
devnull.close()
else:
devnull = file(os.devnull, 'ab')
import tempfile
ape = tempfile.NamedTemporaryFile(suffix='.ape')
f = file(self.filename, 'rb')
transfer_data(f.read, ape.write)
f.close()
ape.flush()
sub = subprocess.Popen([BIN['mac'], ape.name, wave_filename, '-d'],
stdout=devnull,
stderr=devnull)
sub.wait()
ape.close()
devnull.close()
def delete_metadata(self):
import tempfile
new_aiff = tempfile.TemporaryFile()
new_aiff.seek(12, 0)
for (chunk_id, chunk_length, chunk_file) in self.chunk_files():
if (chunk_id != 'ID3 '):
new_aiff.write(
self.CHUNK_HEADER.build(
construct.Container(chunk_id=chunk_id,
chunk_length=chunk_length)))
transfer_data(chunk_file.read, new_aiff.write)
header = construct.Container(aiff_id='FORM',
aiff_size=new_aiff.tell() - 8,
aiff_type='AIFF')
new_aiff.seek(0, 0)
new_aiff.write(self.AIFF_HEADER.build(header))
new_aiff.seek(0, 0)
f = open(self.filename, 'wb')
transfer_data(new_aiff.read, f.write)
new_aiff.close()
f.close()
def update_metadata(self, metadata):
"""takes this track's current MetaData object
as returned by get_metadata() and sets this track's metadata
with any fields updated in that object
raises IOError if unable to write the file
"""
import os
from audiotools import (TemporaryFile,
LimitedFileReader,
transfer_data)
from audiotools.id3 import (ID3v2Comment, ID3CommentPair)
from audiotools.id3v1 import ID3v1Comment
from audiotools.bitstream import BitstreamWriter
if metadata is None:
return
elif (not (isinstance(metadata, ID3v2Comment) or
isinstance(metadata, ID3CommentPair) or
isinstance(metadata, ID3v1Comment))):
from audiotools.text import ERR_FOREIGN_METADATA
raise ValueError(ERR_FOREIGN_METADATA)
elif not os.access(self.filename, os.W_OK):
raise IOError(self.filename)
new_mp3 = TemporaryFile(self.filename)
# get the original MP3 data
old_mp3 = open(self.filename, "rb")
MP3Audio.__find_last_mp3_frame__(old_mp3)
data_end = old_mp3.tell()
old_mp3.seek(0, 0)
MP3Audio.__find_mp3_start__(old_mp3)
data_start = old_mp3.tell()
old_mp3 = LimitedFileReader(old_mp3, data_end - data_start)
# write id3v2 + data + id3v1 to file
if isinstance(metadata, ID3CommentPair):
metadata.id3v2.build(BitstreamWriter(new_mp3, False))
transfer_data(old_mp3.read, new_mp3.write)
metadata.id3v1.build(new_mp3)
elif isinstance(metadata, ID3v2Comment):
metadata.build(BitstreamWriter(new_mp3, False))
transfer_data(old_mp3.read, new_mp3.write)
elif isinstance(metadata, ID3v1Comment):
transfer_data(old_mp3.read, new_mp3.write)
metadata.build(new_mp3)
# commit change to disk
old_mp3.close()
new_mp3.close()
def update_metadata(self, metadata):
"""takes this track's current MetaData object
as returned by get_metadata() and sets this track's metadata
with any fields updated in that object
raises IOError if unable to write the file
"""
import os
from audiotools import (TemporaryFile,
LimitedFileReader,
transfer_data)
from audiotools.id3 import (ID3v2Comment, ID3CommentPair)
from audiotools.id3v1 import ID3v1Comment
from audiotools.bitstream import BitstreamWriter
if (metadata is None):
return
elif (not (isinstance(metadata, ID3v2Comment) or
isinstance(metadata, ID3CommentPair) or
isinstance(metadata, ID3v1Comment))):
from .text import ERR_FOREIGN_METADATA
raise ValueError(ERR_FOREIGN_METADATA)
elif (not os.access(self.filename, os.W_OK)):
raise IOError(self.filename)
new_mp3 = TemporaryFile(self.filename)
#get the original MP3 data
old_mp3 = open(self.filename, "rb")
MP3Audio.__find_last_mp3_frame__(old_mp3)
data_end = old_mp3.tell()
old_mp3.seek(0, 0)
MP3Audio.__find_mp3_start__(old_mp3)
data_start = old_mp3.tell()
old_mp3 = LimitedFileReader(old_mp3, data_end - data_start)
#write id3v2 + data + id3v1 to file
if (isinstance(metadata, ID3CommentPair)):
metadata.id3v2.build(BitstreamWriter(new_mp3, 0))
transfer_data(old_mp3.read, new_mp3.write)
metadata.id3v1.build(new_mp3)
elif (isinstance(metadata, ID3v2Comment)):
metadata.build(BitstreamWriter(new_mp3, 0))
transfer_data(old_mp3.read, new_mp3.write)
elif (isinstance(metadata, ID3v1Comment)):
transfer_data(old_mp3.read, new_mp3.write)
metadata.build(new_mp3)
#commit change to disk
old_mp3.close()
new_mp3.close()
def update_and_backup(track, undo_db, messenger):
changes_made = False
#copy the track to a temporary location
temp_track_f = tempfile.NamedTemporaryFile(suffix="." + track.SUFFIX)
f = open(track.filename, 'rb')
audiotools.transfer_data(f.read, temp_track_f.write)
f.close()
temp_track_f.flush()
temp_track = audiotools.open(temp_track_f.name)
#perform any Track fixes on the temporary Track
(temp_track, messages) = fix_track(temp_track, dry_run=False)
changes_made = changes_made or (len(messages) > 0)
display_messages(messenger, track, messages)
#perform any MetaData fixes on the temporary Track
(metadata, messages) = fix_metadata(temp_track.get_metadata())
changes_made = changes_made or (len(messages) > 0)
display_messages(messenger, track, messages)
if (len(messages) > 0):
temp_track.set_metadata(metadata)
if (changes_made):
#perform xdelta between the old and new track
delta_f = tempfile.NamedTemporaryFile(suffix=".delta")
if (subprocess.call([
audiotools.BIN["xdelta"], "delta", temp_track.filename,
track.filename, delta_f.name
]) != 2):
#store the xdelta in our undo DB
f = open(delta_f.name, 'rb')
data = cStringIO.StringIO()
audiotools.transfer_data(f.read, data.write)
f.close()
delta_f.close()
undo_db[checksum(temp_track_f.name)] = data.getvalue()
#copy the temporary track over the original
f1 = open(temp_track_f.name, 'rb')
f2 = open(track.filename, 'wb')
audiotools.transfer_data(f1.read, f2.write)
f1.close()
f2.close()
temp_track_f.close()
cls.__unlink__(filename)
raise EncodingError(str(err))
#write header to disk
write_header(writer,
pcmreader.channels,
pcmreader.bits_per_sample,
pcmreader.sample_rate,
counter.frames_written)
#write seektable to disk
write_seektable(writer, frame_sizes)
#transfer TTA frames from temporary space to disk
frames.seek(0, 0)
transfer_data(frames.read, file.write)
frames.close()
file.close()
return cls(filename)
def data_size(self):
"""returns the size of the file's data, in bytes,
calculated from its header and seektable"""
return (22 + # header size
(len(self.__frame_lengths__) * 4) + 4 + # seektable size
sum(self.__frame_lengths__)) # frames size
@classmethod
def accuraterip_image_checksum(progress, track, is_first, is_last, ar_matches,
displayed_filename, pcm_frames_offset,
total_pcm_frames):
from audiotools import (transfer_data, PCMReaderProgress, PCMReaderWindow)
from audiotools.accuraterip import Checksum, match_offset
reader = track.to_pcm()
pcm_frames_offset -= PREVIOUS_TRACK_FRAMES
# if PCMReader has seek(), use it to reduce the amount of frames to skip
if (hasattr(reader, "seek") and callable(reader.seek)
and (pcm_frames_offset > 0)):
pcm_frames_offset -= reader.seek(pcm_frames_offset)
# feed stream to checksummers
checksummer = Checksum(total_pcm_frames=total_pcm_frames,
sample_rate=track.sample_rate(),
is_first=is_first,
is_last=is_last,
pcm_frame_range=PREVIOUS_TRACK_FRAMES + 1 +
NEXT_TRACK_FRAMES,
accurateripv2_offset=PREVIOUS_TRACK_FRAMES)
try:
pcmreader = audiotools.PCMReaderProgress(
audiotools.PCMReaderWindow(
reader, pcm_frames_offset,
PREVIOUS_TRACK_FRAMES + total_pcm_frames + NEXT_TRACK_FRAMES),
PREVIOUS_TRACK_FRAMES + total_pcm_frames + NEXT_TRACK_FRAMES,
progress)
audiotools.transfer_data(pcmreader.read, checksummer.update)
except (IOError, ValueError) as err:
return {
"filename": displayed_filename,
"error": str(err),
"v1": {
"checksum": None,
"offset": None,
"confidence": None
},
"v2": {
"checksum": None,
"offset": None,
"confidence": None
}
}
# determine checksum, confidence and offset from
# the calculated checksums and possible AccurateRip matches
(checksum_v2, confidence_v2,
offset_v2) = match_offset(ar_matches=ar_matches,
checksums=[checksummer.checksum_v2()],
initial_offset=0)
(checksum_v1, confidence_v1,
offset_v1) = match_offset(ar_matches=ar_matches,
checksums=checksummer.checksums_v1(),
initial_offset=-PREVIOUS_TRACK_FRAMES)
if len(ar_matches) == 0:
return {
"filename": displayed_filename,
"error": None,
"v1": {
"checksum": checksum_v1,
"offset": offset_v1,
"confidence": AR_NOT_FOUND
},
"v2": {
"checksum": checksum_v2,
"offset": offset_v2,
"confidence": AR_NOT_FOUND
}
}
else:
return {
"filename": displayed_filename,
"error": None,
"v1": {
"checksum":
checksum_v1,
"offset":
offset_v1,
"confidence": (confidence_v1 if
(confidence_v1 is not None) else AR_MISMATCH)
},
"v2": {
"checksum":
checksum_v2,
"offset":
offset_v2,
"confidence": (confidence_v2 if
(confidence_v2 is not None) else AR_MISMATCH)
}
}
def from_pcm(cls, filename, pcmreader,
compression=None, total_pcm_frames=None):
"""encodes a new file from PCM data
takes a filename string, PCMReader object,
optional compression level string and optional
total_pcm_frames integer
encodes a new audio file from pcmreader's data
at the given filename with the specified compression level
and returns a new M4AAudio object"""
import subprocess
import os
from audiotools import PCMConverter
from audiotools import transfer_data
from audiotools import transfer_framelist_data
from audiotools import ignore_sigint
from audiotools import EncodingError
from audiotools import DecodingError
from audiotools import ChannelMask
from audiotools import __default_quality__
if ((compression is None) or (compression not in
cls.COMPRESSION_MODES)):
compression = __default_quality__(cls.NAME)
if pcmreader.bits_per_sample not in {8, 16, 24}:
from audiotools import UnsupportedBitsPerSample
pcmreader.close()
raise UnsupportedBitsPerSample(filename, pcmreader.bits_per_sample)
if pcmreader.channels > 2:
pcmreader = PCMConverter(pcmreader,
sample_rate=pcmreader.sample_rate,
channels=2,
channel_mask=ChannelMask.from_channels(2),
bits_per_sample=pcmreader.bits_per_sample)
# faac requires files to end with .m4a for some reason
if not filename.endswith(".m4a"):
import tempfile
actual_filename = filename
tempfile = tempfile.NamedTemporaryFile(suffix=".m4a")
filename = tempfile.name
else:
actual_filename = tempfile = None
sub = subprocess.Popen(
[BIN['faac'],
"-q", compression,
"-P",
"-R", str(pcmreader.sample_rate),
"-B", str(pcmreader.bits_per_sample),
"-C", str(pcmreader.channels),
"-X",
"-o", filename,
"-"],
stdin=subprocess.PIPE,
stderr=subprocess.DEVNULL if hasattr(subprocess, "DEVNULL") else
open(os.devnull, "wb"),
stdout=subprocess.DEVNULL if hasattr(subprocess, "DEVNULL") else
open(os.devnull, "wb"),
preexec_fn=ignore_sigint)
# Note: faac handles SIGINT on its own,
# so trying to ignore it doesn't work like on most other encoders.
try:
if total_pcm_frames is not None:
from audiotools import CounterPCMReader
pcmreader = CounterPCMReader(pcmreader)
transfer_framelist_data(pcmreader, sub.stdin.write)
if ((total_pcm_frames is not None) and
(total_pcm_frames != pcmreader.frames_written)):
from audiotools.text import ERR_TOTAL_PCM_FRAMES_MISMATCH
raise EncodingError(ERR_TOTAL_PCM_FRAMES_MISMATCH)
except (ValueError, IOError) as err:
sub.stdin.close()
sub.wait()
cls.__unlink__(filename)
raise EncodingError(str(err))
except Exception:
sub.stdin.close()
sub.wait()
cls.__unlink__(filename)
raise
sub.stdin.close()
if sub.wait() == 0:
if tempfile is not None:
filename = actual_filename
f = open(filename, 'wb')
tempfile.seek(0, 0)
transfer_data(tempfile.read, f.write)
f.close()
tempfile.close()
return M4AAudio(filename)
else:
if tempfile is not None:
tempfile.close()
raise EncodingError(u"unable to write file with faac")
"""Writes the contents of this file to the given .wav filename string.
Raises EncodingError if some error occurs during decoding."""
try:
self.verify()
except InvalidWave, err:
raise EncodingError(str(err))
try:
output = file(wave_filename, 'wb')
input = file(self.filename, 'rb')
except IOError, msg:
raise EncodingError(str(msg))
try:
transfer_data(input.read, output.write)
finally:
input.close()
output.close()
@classmethod
def from_wave(cls, filename, wave_filename, compression=None,
progress=None):
"""Encodes a new AudioFile from an existing .wav file.
Takes a filename string, wave_filename string
of an existing WaveAudio file
and an optional compression level string.
Encodes a new audio file from the wave's data
at the given filename with the specified compression level
and returns a new WaveAudio object."""
def rip_disk(self):
"""Most of this is just copied from cdda2track, a part of python-audio-tools"""
try:
cddareader = CDDAReader(app.config['ripper']['cdrom'], True)
track_offsets = cddareader.track_offsets
track_lengths = cddareader.track_lengths
except (IOError, ValueError, OSError) as err:
self.update_state(state='FAILURE', meta={'error': str(err)})
raise Ignore()
if "offset" in app.config['ripper']:
read_offset = app.config['ripper']['offset']
else:
read_offset = 0
if "speed" in app.config['ripper']:
cddareader.set_speed(app.config['ripper']['speed'])
pre_gap_length = cddareader.track_offsets[1]
if pre_gap_length > 0:
with audiotools.BufferedPCMReader(audiotools.PCMReaderWindow(cddareader,
read_offset,
pre_gap_length,
forward_close=False)) as r:
preserve_pre_gap = set(r.read(pre_gap_length)) != {0}
if preserve_pre_gap:
track_offsets[0] = 0
track_lengths[0] = pre_gap_length
else:
preserve_pre_gap = False
self.update_state(state='PROGRESS', meta={'current': None,
'total': None,
'album': None,
'artist': None,
'metadata': [],
'status': 'Reading metadata'})
metadata_choices = audiotools.cddareader_metadata_lookup(cddareader)
if preserve_pre_gap:
# prepend "track 0" track to start of list for each choice
for choice in metadata_choices:
track_0 = merge_metadatas(choice)
track_0.track_number = 0
choice.insert(0, track_0)
album = metadata_choices[0][0].album_name
artist = metadata_choices[0][0].artist_name
self.update_state(state='PROGRESS', meta={'current': None,
'total': len(track_offsets),
'album': album,
'artist': artist,
'metadata': jsonify_metadata(metadata_choices[0]),
'status': 'Got metadata, preparing to rip'})
tracks_to_rip = list(sorted(track_offsets.keys()))
try:
output_tracks = list(
process_output_options(
metadata_choices=[
[c for i, c in
enumerate(choices, 0 if preserve_pre_gap else 1)
if i in tracks_to_rip]
for choices in metadata_choices],
input_filenames=[
audiotools.Filename("track{:02d}.cdda.wav".format(i))
for i in tracks_to_rip],
output_directory=app.config['ripper']['output_directory'],
format_string=None,
output_class=audiotools.wav.WaveAudio,
quality='',
msg=msg,
use_default=True))
except audiotools.UnsupportedTracknameField as err:
self.update_state(state='FAILURE', meta={'error': str(err)})
raise Ignore()
encoded = []
rip_log = {}
accuraterip_log_v1 = {}
accuraterip_log_v2 = {}
replay_gain = audiotools.ReplayGainCalculator(cddareader.sample_rate)
for (track_number,
index,
(output_class,
output_filename,
output_quality,
output_metadata)) in zip(tracks_to_rip,
range(1, len(tracks_to_rip) + 1),
output_tracks):
self.update_state(state='PROGRESS', meta={'current': track_number,
'total': len(tracks_to_rip),
'album': album,
'artist': artist,
'metadata': jsonify_metadata(metadata_choices[0]),
'status': 'Preparing to rip'})
cddareader.reset_log()
track_offset = (track_offsets[track_number] +
read_offset -
PREVIOUS_TRACK_FRAMES)
track_length = track_lengths[track_number]
# seek to indicated starting offset
if track_offset > 0:
seeked_offset = cddareader.seek(track_offset)
else:
seeked_offset = cddareader.seek(0)
# make leading directories, if necessary
try:
audiotools.make_dirs(str(output_filename))
except OSError as err:
self.update_state(state='FAILURE', meta={'error': str(err)})
raise Ignore()
# setup individual progress bar per track
state = {'current': track_number,
'total': len(tracks_to_rip),
'album': album,
'artist': artist,
'metadata': jsonify_metadata(metadata_choices[0]),
'status': 'Ripping...'}
progress = CeleryProgressDisplay(msg, state, self)
# perform extraction over an AccurateRip window
track_data = audiotools.PCMReaderWindow(
cddareader,
track_offset - seeked_offset,
PREVIOUS_TRACK_FRAMES + track_length + NEXT_TRACK_FRAMES)
# with AccurateRip calculated during extraction
accuraterip = AccurateRipReader(
track_data,
track_length,
track_number == min(track_offsets.keys()),
track_number == max(track_offsets.keys()))
try:
# encode output file itself
track = output_class.from_pcm(
str(output_filename),
replay_gain.to_pcm(
audiotools.PCMReaderProgress(
audiotools.PCMReaderWindow(
accuraterip,
PREVIOUS_TRACK_FRAMES,
track_length,
forward_close=False),
track_length,
progress.update)),
output_quality,
total_pcm_frames=track_length)
encoded.append(track)
# since the inner PCMReaderWindow only outputs part
# of the accuraterip reader, we need to ensure
# anything left over in accuraterip gets processed also
audiotools.transfer_data(accuraterip.read, lambda f: None)
except audiotools.EncodingError as err:
self.update_state(state='FAILURE', meta={'error': str(err)})
raise Ignore()
track.set_metadata(output_metadata)
rip_log[track_number] = cddareader.log()
accuraterip_log_v1[track_number] = accuraterip.checksums_v1()
accuraterip_log_v2[track_number] = accuraterip.checksums_v2()
self.update_state(state='SUCCESS', meta={'total': len(tracks_to_rip),
'album': album,
'artist': artist,
'metadata': jsonify_metadata(metadata_choices[0]),
'status': 'Fully ripped'})
return {'status': 'done', 'tracks': len(tracks_to_rip)}
def from_pcm(cls,
filename,
pcmreader,
compression=None,
total_pcm_frames=None,
encoding_function=None):
"""encodes a new file from PCM data
takes a filename string, PCMReader object,
optional compression level string and
optional total_pcm_frames integer
encodes a new audio file from pcmreader's data
at the given filename with the specified compression level
and returns a new AudioFile-compatible object
may raise EncodingError if some problem occurs when
encoding the input file. This includes an error
in the input stream, a problem writing the output file,
or even an EncodingError subclass such as
"UnsupportedBitsPerSample" if the input stream
is formatted in a way this class is unable to support
"""
from audiotools import (BufferedPCMReader, CounterPCMReader,
transfer_data, EncodingError)
# from audiotools.py_encoders import encode_tta
from audiotools.encoders import encode_tta
from audiotools.bitstream import BitstreamWriter
# open output file right away
# so we can fail as soon as possible
try:
file = open(filename, "wb")
except IOError as err:
pcmreader.close()
raise EncodingError(str(err))
writer = BitstreamWriter(file, True)
counter = CounterPCMReader(pcmreader)
try:
if (total_pcm_frames is not None):
# write header to disk
write_header(writer, pcmreader.channels,
pcmreader.bits_per_sample, pcmreader.sample_rate,
total_pcm_frames)
block_size = (pcmreader.sample_rate * 256) // 245
total_tta_frames = div_ceil(total_pcm_frames, block_size)
# write temporary seektable to disk
writer.mark()
write_seektable(writer, [0] * total_tta_frames)
writer.flush()
# write frames to disk
try:
frame_sizes = \
(encode_tta if encoding_function is None
else encoding_function)(file,
BufferedPCMReader(counter))
except (IOError, ValueError) as err:
cls.__unlink__(filename)
raise EncodingError(str(err))
# ensure written number of PCM frames
# matches total_pcm_frames
if (counter.frames_written != total_pcm_frames):
from audiotools.text import ERR_TOTAL_PCM_FRAMES_MISMATCH
cls.__unlink__(filename)
raise EncodingError(ERR_TOTAL_PCM_FRAMES_MISMATCH)
assert (len(frame_sizes) == total_tta_frames)
# go back and rewrite seektable with completed one
writer.rewind()
write_seektable(writer, frame_sizes)
writer.unmark()
else:
import tempfile
frames = tempfile.TemporaryFile()
# encode TTA frames to temporary file
try:
frame_sizes = \
(encode_tta if encoding_function is None
else encoding_function)(frames,
BufferedPCMReader(counter))
except (IOError, ValueError) as err:
frames.close()
cls.__unlink__(filename)
raise EncodingError(str(err))
# write header to disk
write_header(writer, pcmreader.channels,
pcmreader.bits_per_sample, pcmreader.sample_rate,
counter.frames_written)
# write seektable to disk
write_seektable(writer, frame_sizes)
# transfer TTA frames from temporary space to disk
frames.seek(0, 0)
transfer_data(frames.read, writer.write_bytes)
frames.close()
finally:
counter.close()
if (writer.has_mark()):
writer.unmark()
writer.close()
return cls(filename)
sub.wait()
cls.__unlink__(filename)
raise err
try:
pcmreader.close()
except DecodingError, err:
raise EncodingError(err.error_message)
sub.stdin.close()
if sub.wait() == 0:
if tempfile is not None:
filename = actual_filename
f = file(filename, "wb")
tempfile.seek(0, 0)
transfer_data(tempfile.read, f.write)
f.close()
tempfile.close()
return M4AAudio(filename)
else:
if tempfile is not None:
tempfile.close()
raise EncodingError(u"unable to write file with faac")
@classmethod
def can_add_replay_gain(cls):
"""Returns False."""
return False
def update_metadata(self, metadata):
"""takes this track's current MetaData object
as returned by get_metadata() and sets this track's metadata
with any fields updated in that object
raises IOError if unable to write the file
"""
import os
from audiotools.ape import ApeTag
from audiotools.id3 import ID3v2Comment
from audiotools.id3 import ID3CommentPair
from audiotools.id3v1 import ID3v1Comment
if (metadata is None):
return
elif (not os.access(self.filename, os.W_OK)):
raise IOError(self.filename)
# ensure metadata is APEv2, ID3v2, ID3v1, or ID3CommentPair
if (((not isinstance(metadata, ApeTag))
and (not isinstance(metadata, ID3v2Comment))
and (not isinstance(metadata, ID3CommentPair))
and (not isinstance(metadata, ID3v1Comment)))):
from audiotools.text import ERR_FOREIGN_METADATA
raise ValueError(ERR_FOREIGN_METADATA)
current_metadata = self.get_metadata()
if (isinstance(metadata, ApeTag) and (current_metadata is None)):
# if new metadata is APEv2 and no current metadata,
# simply append APEv2 tag
from audiotools.bitstream import BitstreamWriter
with BitstreamWriter(open(self.filename, "ab"), True) as writer:
metadata.build(writer)
elif (isinstance(metadata, ApeTag)
and isinstance(current_metadata, ApeTag)
and (metadata.total_size() > current_metadata.total_size())):
# if new metadata is APEv2, current metadata is APEv2
# and new metadata is larger,
# overwrite old tag with new tag
from audiotools.bitstream import BitstreamWriter
with open(self.filename, "r+b") as f:
f.seek(-current_metadata.total_size(), 2)
metadata.build(BitstreamWriter(f, True))
else:
from audiotools.bitstream import BitstreamWriter
from audiotools import (transfer_data, LimitedFileReader,
TemporaryFile)
from audiotools.id3 import skip_id3v2_comment
# otherwise, rebuild TTA with APEv2/ID3 tags in place
old_tta = open(self.filename, "rb")
skip_id3v2_comment(old_tta)
old_tta = LimitedFileReader(old_tta, self.data_size())
new_tta = TemporaryFile(self.filename)
if (isinstance(metadata, ApeTag)):
transfer_data(old_tta.read, new_tta.write)
metadata.build(BitstreamWriter(new_tta, True))
elif (isinstance(metadata, ID3CommentPair)):
metadata.id3v2.build(BitstreamWriter(new_tta, False))
transfer_data(old_tta.read, new_tta.write)
metadata.id3v1.build(new_tta)
elif (isinstance(metadata, ID3v2Comment)):
metadata.build(BitstreamWriter(new_tta, False))
transfer_data(old_tta.read, new_tta.write)
else:
# ID3v1Comment
transfer_data(old_tta.read, new_tta.write)
metadata.build(new_tta)
old_tta.close()
new_tta.close()
def accuraterip_checksum(progress, track, previous_track, next_track,
ar_matches):
from audiotools import (transfer_data, PCMCat, PCMReaderHead,
PCMReaderDeHead, PCMReaderProgress)
from audiotools.decoders import SameSample
from audiotools.accuraterip import Checksum, match_offset
# unify previous track, current track and next track into a single stream
pcmreaders = []
if previous_track is not None:
frames_to_skip = previous_track.total_frames() - PREVIOUS_TRACK_FRAMES
prev_pcmreader = previous_track.to_pcm()
if hasattr(prev_pcmreader, "seek") and callable(prev_pcmreader.seek):
frames_to_skip -= prev_pcmreader.seek(frames_to_skip)
pcmreaders.append(PCMReaderDeHead(prev_pcmreader, frames_to_skip))
else:
pcmreaders.append(
SameSample(sample=0,
total_pcm_frames=PREVIOUS_TRACK_FRAMES,
sample_rate=track.sample_rate(),
channels=track.channels(),
channel_mask=int(track.channel_mask()),
bits_per_sample=track.bits_per_sample()))
pcmreaders.append(track.to_pcm())
if next_track is not None:
pcmreaders.append(PCMReaderHead(next_track.to_pcm(),
NEXT_TRACK_FRAMES))
else:
pcmreaders.append(
SameSample(sample=0,
total_pcm_frames=NEXT_TRACK_FRAMES,
sample_rate=track.sample_rate(),
channels=track.channels(),
channel_mask=int(track.channel_mask()),
bits_per_sample=track.bits_per_sample()))
# feed stream to checksummer
checksummer = Checksum(total_pcm_frames=track.total_frames(),
sample_rate=track.sample_rate(),
is_first=(previous_track is None),
is_last=(next_track is None),
pcm_frame_range=PREVIOUS_TRACK_FRAMES + 1 +
NEXT_TRACK_FRAMES,
accurateripv2_offset=PREVIOUS_TRACK_FRAMES)
try:
pcmreader = PCMReaderProgress(
PCMCat(pcmreaders),
PREVIOUS_TRACK_FRAMES + track.total_frames() + NEXT_TRACK_FRAMES,
progress)
audiotools.transfer_data(pcmreader.read, checksummer.update)
except (IOError, ValueError) as err:
return {
"filename": audiotools.Filename(track.filename).__unicode__(),
"error": str(err),
"v1": {
"checksum": None,
"offset": None,
"confidence": None
},
"v2": {
"checksum": None,
"offset": None,
"confidence": None
}
}
# determine checksum, confidence and offset from
# the calculated checksums and possible AccurateRip matches
(checksum_v2, confidence_v2,
offset_v2) = match_offset(ar_matches,
checksums=[checksummer.checksum_v2()],
initial_offset=0)
(checksum_v1, confidence_v1,
offset_v1) = match_offset(ar_matches=ar_matches,
checksums=checksummer.checksums_v1(),
initial_offset=-PREVIOUS_TRACK_FRAMES)
if len(ar_matches) == 0:
return {
"filename": audiotools.Filename(track.filename).__unicode__(),
"error": None,
"v1": {
"checksum": checksum_v1,
"offset": offset_v1,
"confidence": AR_NOT_FOUND
},
"v2": {
"checksum": checksum_v2,
"offset": offset_v2,
"confidence": AR_NOT_FOUND
}
}
else:
return {
"filename": audiotools.Filename(track.filename).__unicode__(),
"error": None,
"v1": {
"checksum":
checksum_v1,
"offset":
offset_v1,
"confidence": (confidence_v1 if
(confidence_v1 is not None) else AR_MISMATCH)
},
"v2": {
"checksum":
checksum_v2,
"offset":
offset_v2,
"confidence": (confidence_v2 if
(confidence_v2 is not None) else AR_MISMATCH)
}
}
def from_pcm(cls, filename, pcmreader,
compression=None,
total_pcm_frames=None,
encoding_function=None):
"""encodes a new file from PCM data
takes a filename string, PCMReader object,
optional compression level string and
optional total_pcm_frames integer
encodes a new audio file from pcmreader's data
at the given filename with the specified compression level
and returns a new AudioFile-compatible object
may raise EncodingError if some problem occurs when
encoding the input file. This includes an error
in the input stream, a problem writing the output file,
or even an EncodingError subclass such as
"UnsupportedBitsPerSample" if the input stream
is formatted in a way this class is unable to support
"""
from audiotools import (BufferedPCMReader,
CounterPCMReader,
transfer_data,
EncodingError)
# from audiotools.py_encoders import encode_tta
from audiotools.encoders import encode_tta
from audiotools.bitstream import BitstreamWriter
# open output file right away
# so we can fail as soon as possible
try:
file = open(filename, "wb")
except IOError as err:
pcmreader.close()
raise EncodingError(str(err))
writer = BitstreamWriter(file, True)
counter = CounterPCMReader(pcmreader)
try:
if (total_pcm_frames is not None):
# write header to disk
write_header(writer,
pcmreader.channels,
pcmreader.bits_per_sample,
pcmreader.sample_rate,
total_pcm_frames)
block_size = (pcmreader.sample_rate * 256) // 245
total_tta_frames = div_ceil(total_pcm_frames, block_size)
# write temporary seektable to disk
writer.mark()
write_seektable(writer, [0] * total_tta_frames)
writer.flush()
# write frames to disk
try:
frame_sizes = \
(encode_tta if encoding_function is None
else encoding_function)(file,
BufferedPCMReader(counter))
except (IOError, ValueError) as err:
cls.__unlink__(filename)
raise EncodingError(str(err))
# ensure written number of PCM frames
# matches total_pcm_frames
if (counter.frames_written != total_pcm_frames):
from audiotools.text import ERR_TOTAL_PCM_FRAMES_MISMATCH
cls.__unlink__(filename)
raise EncodingError(ERR_TOTAL_PCM_FRAMES_MISMATCH)
assert(len(frame_sizes) == total_tta_frames)
# go back and rewrite seektable with completed one
writer.rewind()
write_seektable(writer, frame_sizes)
writer.unmark()
else:
import tempfile
frames = tempfile.TemporaryFile()
# encode TTA frames to temporary file
try:
frame_sizes = \
(encode_tta if encoding_function is None
else encoding_function)(frames,
BufferedPCMReader(counter))
except (IOError, ValueError) as err:
frames.close()
cls.__unlink__(filename)
raise EncodingError(str(err))
# write header to disk
write_header(writer,
pcmreader.channels,
pcmreader.bits_per_sample,
pcmreader.sample_rate,
counter.frames_written)
# write seektable to disk
write_seektable(writer, frame_sizes)
# transfer TTA frames from temporary space to disk
frames.seek(0, 0)
transfer_data(frames.read, writer.write_bytes)
frames.close()
finally:
counter.close()
if (writer.has_mark()):
writer.unmark()
writer.close()
return cls(filename)
def add_replay_gain(cls, filenames, progress=None):
"""Adds ReplayGain values to a list of filename strings.
All the filenames must be of this AudioFile type.
Raises ValueError if some problem occurs during ReplayGain application.
"""
from audiotools.replaygain import ReplayGain, ReplayGainReader
import tempfile
wave_files = [track for track in open_files(filenames) if
isinstance(track, cls)]
track_gains = []
total_frames = sum([track.total_frames() for track in wave_files]) * 2
processed_frames = 0
#first, calculate the Gain and Peak values from our files
for original_wave in wave_files:
try:
rg = ReplayGain(original_wave.sample_rate())
except ValueError:
track_gains.append((None, None))
pcm = original_wave.to_pcm()
try:
try:
frame = pcm.read(BUFFER_SIZE)
while (len(frame) > 0):
processed_frames += frame.frames
if (progress is not None):
progress(processed_frames, total_frames)
rg.update(frame)
frame = pcm.read(BUFFER_SIZE)
track_gains.append(rg.title_gain())
except ValueError:
track_gains.append((None, None))
finally:
pcm.close()
#then, apply those Gain and Peak values to our files
#rewriting the originals in the process
for (original_wave, (gain, peak)) in zip(wave_files, track_gains):
if (gain is None):
continue
temp_wav_file = tempfile.NamedTemporaryFile(suffix=".wav")
try:
(header, footer) = original_wave.pcm_split()
temp_wav_file.write(header)
replaygain_pcm = ReplayGainReader(original_wave.to_pcm(),
gain, peak)
frame = replaygain_pcm.read(BUFFER_SIZE)
while (len(frame) > 0):
processed_frames += frame.frames
if (progress is not None):
progress(processed_frames, total_frames)
temp_wav_file.write(frame.to_bytes(
False,
original_wave.bits_per_sample() > 8))
frame = replaygain_pcm.read(BUFFER_SIZE)
temp_wav_file.write(footer)
temp_wav_file.seek(0, 0)
new_wave = open(original_wave.filename, 'wb')
transfer_data(temp_wav_file.read, new_wave.write)
new_wave.close()
finally:
temp_wav_file.close()
def from_pcm(cls,
filename,
pcmreader,
compression=None,
total_pcm_frames=None):
"""encodes a new file from PCM data
takes a filename string, PCMReader object,
optional compression level string and optional
total_pcm_frames integer
encodes a new audio file from pcmreader's data
at the given filename with the specified compression level
and returns a new M4AAudio object"""
import subprocess
import os
from audiotools import PCMConverter
from audiotools import transfer_data
from audiotools import transfer_framelist_data
from audiotools import ignore_sigint
from audiotools import EncodingError
from audiotools import DecodingError
from audiotools import ChannelMask
from audiotools import __default_quality__
if ((compression is None)
or (compression not in cls.COMPRESSION_MODES)):
compression = __default_quality__(cls.NAME)
if pcmreader.channels > 2:
pcmreader = PCMConverter(pcmreader,
sample_rate=pcmreader.sample_rate,
channels=2,
channel_mask=ChannelMask.from_channels(2),
bits_per_sample=pcmreader.bits_per_sample)
# faac requires files to end with .m4a for some reason
if not filename.endswith(".m4a"):
import tempfile
actual_filename = filename
tempfile = tempfile.NamedTemporaryFile(suffix=".m4a")
filename = tempfile.name
else:
actual_filename = tempfile = None
sub = subprocess.Popen(
[
BIN['faac'], "-q", compression, "-P", "-R",
str(pcmreader.sample_rate), "-B",
str(pcmreader.bits_per_sample), "-C",
str(pcmreader.channels), "-X", "-o", filename, "-"
],
stdin=subprocess.PIPE,
stderr=subprocess.DEVNULL
if hasattr(subprocess, "DEVNULL") else open(os.devnull, "wb"),
stdout=subprocess.DEVNULL
if hasattr(subprocess, "DEVNULL") else open(os.devnull, "wb"),
preexec_fn=ignore_sigint)
# Note: faac handles SIGINT on its own,
# so trying to ignore it doesn't work like on most other encoders.
try:
if total_pcm_frames is not None:
from audiotools import CounterPCMReader
pcmreader = CounterPCMReader(pcmreader)
transfer_framelist_data(pcmreader, sub.stdin.write)
if ((total_pcm_frames is not None)
and (total_pcm_frames != pcmreader.frames_written)):
from audiotools.text import ERR_TOTAL_PCM_FRAMES_MISMATCH
raise EncodingError(ERR_TOTAL_PCM_FRAMES_MISMATCH)
except (ValueError, IOError) as err:
sub.stdin.close()
sub.wait()
cls.__unlink__(filename)
raise EncodingError(str(err))
except Exception:
sub.stdin.close()
sub.wait()
cls.__unlink__(filename)
raise
sub.stdin.close()
if sub.wait() == 0:
if tempfile is not None:
filename = actual_filename
f = open(filename, 'wb')
tempfile.seek(0, 0)
transfer_data(tempfile.read, f.write)
f.close()
tempfile.close()
return M4AAudio(filename)
else:
if tempfile is not None:
tempfile.close()
raise EncodingError(u"unable to write file with faac")
def update_metadata(self, metadata):
"""takes this track's current MetaData object
as returned by get_metadata() and sets this track's metadata
with any fields updated in that object
raises IOError if unable to write the file
"""
import os
from audiotools.ape import ApeTag
from audiotools.id3 import ID3v2Comment
from audiotools.id3 import ID3CommentPair
from audiotools.id3v1 import ID3v1Comment
if (metadata is None):
return
elif (not os.access(self.filename, os.W_OK)):
raise IOError(self.filename)
# ensure metadata is APEv2, ID3v2, ID3v1, or ID3CommentPair
if (((not isinstance(metadata, ApeTag)) and
(not isinstance(metadata, ID3v2Comment)) and
(not isinstance(metadata, ID3CommentPair)) and
(not isinstance(metadata, ID3v1Comment)))):
from audiotools.text import ERR_FOREIGN_METADATA
raise ValueError(ERR_FOREIGN_METADATA)
current_metadata = self.get_metadata()
if (isinstance(metadata, ApeTag) and (current_metadata is None)):
# if new metadata is APEv2 and no current metadata,
# simply append APEv2 tag
from audiotools.bitstream import BitstreamWriter
with BitstreamWriter(open(self.filename, "ab"), True) as writer:
metadata.build(writer)
elif (isinstance(metadata, ApeTag) and
isinstance(current_metadata, ApeTag) and
(metadata.total_size() > current_metadata.total_size())):
# if new metadata is APEv2, current metadata is APEv2
# and new metadata is larger,
# overwrite old tag with new tag
from audiotools.bitstream import BitstreamWriter
with open(self.filename, "r+b") as f:
f.seek(-current_metadata.total_size(), 2)
metadata.build(BitstreamWriter(f, True))
else:
from audiotools.bitstream import BitstreamWriter
from audiotools import (transfer_data,
LimitedFileReader,
TemporaryFile)
from audiotools.id3 import skip_id3v2_comment
# otherwise, rebuild TTA with APEv2/ID3 tags in place
old_tta = open(self.filename, "rb")
skip_id3v2_comment(old_tta)
old_tta = LimitedFileReader(old_tta, self.data_size())
new_tta = TemporaryFile(self.filename)
if (isinstance(metadata, ApeTag)):
transfer_data(old_tta.read, new_tta.write)
metadata.build(BitstreamWriter(new_tta, True))
elif (isinstance(metadata, ID3CommentPair)):
metadata.id3v2.build(BitstreamWriter(new_tta, False))
transfer_data(old_tta.read, new_tta.write)
metadata.id3v1.build(new_tta)
elif (isinstance(metadata, ID3v2Comment)):
metadata.build(BitstreamWriter(new_tta, False))
transfer_data(old_tta.read, new_tta.write)
else:
# ID3v1Comment
transfer_data(old_tta.read, new_tta.write)
metadata.build(new_tta)
old_tta.close()
new_tta.close()
def update_metadata(self, metadata):
if (metadata is None):
return
elif (not isinstance(metadata, ApeTag)):
raise ValueError(_(u"metadata not from audio file"))
from .bitstream import BitstreamReader, BitstreamWriter
f = file(self.filename, "r+b")
f.seek(-32, 2)
(preamble,
version,
tag_size,
item_count,
read_only,
item_encoding,
is_header,
no_footer,
has_header) = BitstreamReader(f, 1).parse(ApeTag.HEADER_FORMAT)
if ((preamble == 'APETAGEX') and (version == 2000)):
if (has_header):
old_tag_size = 32 + tag_size
else:
old_tag_size = tag_size
if (metadata.total_size() >= old_tag_size):
#metadata has grown
#so append it to existing file
f.seek(-old_tag_size, 2)
metadata.build(BitstreamWriter(f, 1))
else:
#metadata has shrunk
#so rewrite file with smaller metadata
import tempfile
from os.path import getsize
rewritten = tempfile.TemporaryFile()
#copy everything but the last "old_tag_size" bytes
#from existing file to rewritten file
f = open(self.filename, "rb")
limited_transfer_data(f.read, rewritten.write,
os.path.getsize(self.filename) -
old_tag_size)
f.close()
#append new tag to rewritten file
metadata.build(BitstreamWriter(rewritten, 1))
#finally, overwrite current file with rewritten file
rewritten.seek(0, 0)
f = open(self.filename, "wb")
transfer_data(rewritten.read, f.write)
f.close()
rewritten.close()
else:
#no existing metadata, so simply append a fresh tag
f = file(self.filename, "ab")
metadata.build(BitstreamWriter(f, 1))
f.close()
def update_metadata(self, metadata):
"""Takes this track's current MetaData object
as returned by get_metadata() and sets this track's metadata
with any fields updated in that object.
Raises IOError if unable to write the file.
"""
from struct import pack
if (metadata is None):
return
elif (not isinstance(metadata, ID3v22Comment)):
raise _(u"metadata not from audio file")
def chunk_filter(chunks, id3_chunk):
id3_found = False
for (chunk_id, chunk_size, chunk_data) in chunks:
if (chunk_id == 'ID3 '):
if (len(id3_chunk) % 2):
yield (chunk_id,
pack(">I", len(id3_chunk)),
id3_chunk + chr(0))
else:
yield (chunk_id,
pack(">I", len(id3_chunk)),
id3_chunk)
id3_found = True
else:
yield (chunk_id, chunk_size, chunk_data)
else:
if (not id3_found):
if (len(id3_chunk) % 2):
yield ('ID3 ',
pack(">I", len(id3_chunk)),
id3_chunk + chr(0))
else:
yield ('ID3 ',
pack(">I", len(id3_chunk)),
id3_chunk)
import tempfile
from .bitstream import BitstreamRecorder
#turn our ID3v2.2 tag into a raw binary chunk
id3_chunk = BitstreamRecorder(0)
metadata.build(id3_chunk)
id3_chunk = id3_chunk.data()
#generate a temporary AIFF file in which our new ID3v2.2 chunk
#replaces the existing ID3v2.2 chunk
new_aiff = tempfile.NamedTemporaryFile(suffix=self.SUFFIX)
self.__class__.aiff_from_chunks(new_aiff.name,
chunk_filter(self.chunks(),
id3_chunk))
#replace the existing file with data from the temporary file
new_file = open(new_aiff.name, 'rb')
old_file = open(self.filename, 'wb')
transfer_data(new_file.read, old_file.write)
old_file.close()
new_file.close()
def to_pcm(self):
"""Returns a PCMReader object containing the track's PCM data."""
#if mpg123 is available, use that for decoding
if (BIN.can_execute(BIN["mpg123"])):
sub = subprocess.Popen([BIN["mpg123"], "-qs", self.filename],
stdout=subprocess.PIPE,
stderr=file(os.devnull, "a"))
return PCMReader(sub.stdout,
sample_rate=self.sample_rate(),
channels=self.channels(),
bits_per_sample=16,
channel_mask=int(ChannelMask.from_channels(
self.channels())),
process=sub,
big_endian=BIG_ENDIAN)
else:
#if not, use LAME for decoding
if (self.filename.endswith("." + self.SUFFIX)):
if (BIG_ENDIAN):
endian = ['-x']
else:
endian = []
sub = subprocess.Popen([BIN['lame']] + endian + \
["--decode", "-t", "--quiet",
self.filename, "-"],
stdout=subprocess.PIPE)
return PCMReader(
sub.stdout,
sample_rate=self.sample_rate(),
channels=self.channels(),
bits_per_sample=16,
channel_mask=int(self.channel_mask()),
process=sub)
else:
import tempfile
from audiotools import TempWaveReader
#copy our file to one that ends with .mp3
tempmp3 = tempfile.NamedTemporaryFile(suffix='.' + self.SUFFIX)
f = open(self.filename, 'rb')
transfer_data(f.read, tempmp3.write)
f.close()
tempmp3.flush()
#decode the mp3 file to a WAVE file
wave = tempfile.NamedTemporaryFile(suffix='.wav')
returnval = subprocess.call([BIN['lame'], "--decode",
"--quiet",
tempmp3.name, wave.name])
tempmp3.close()
if (returnval == 0):
#return WAVE file as a stream
wave.seek(0, 0)
return TempWaveReader(wave)
else:
return PCMReaderError(
error_message=u"lame exited with error",
sample_rate=self.sample_rate(),
channels=self.channels(),
channel_mask=int(self.channel_mask()),
bits_per_sample=16)