def get_metadata(self):
"""returns a MetaData object, or None
raises IOError if unable to read the file"""
from cStringIO import StringIO
from audiotools.bitstream import BitstreamReader
from audiotools.ogg import PacketReader, PageReader
from audiotools.vorbiscomment import VorbisComment
reader = PacketReader(PageReader(open(self.filename, "rb")))
identification = reader.read_packet()
comment = BitstreamReader(StringIO(reader.read_packet()), True)
(packet_type, packet_header) = comment.parse("8u 6b")
if ((packet_type == 3) and (packet_header == 'vorbis')):
vendor_string = \
comment.read_bytes(comment.read(32)).decode('utf-8')
comment_strings = [
comment.read_bytes(comment.read(32)).decode('utf-8')
for i in xrange(comment.read(32))]
if (comment.read(1) == 1): # framing bit
return VorbisComment(comment_strings, vendor_string)
else:
return None
else:
return None
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"""
from .vorbiscomment import VorbisComment
if (metadata is not None):
metadata = VorbisComment.converted(metadata)
old_metadata = self.get_metadata()
metadata.vendor_string = old_metadata.vendor_string
#remove REPLAYGAIN_* tags from new metadata (if any)
for key in [u"REPLAYGAIN_TRACK_GAIN",
u"REPLAYGAIN_TRACK_PEAK",
u"REPLAYGAIN_ALBUM_GAIN",
u"REPLAYGAIN_ALBUM_PEAK",
u"REPLAYGAIN_REFERENCE_LOUDNESS"]:
try:
metadata[key] = old_metadata[key]
except KeyError:
metadata[key] = []
self.update_metadata(metadata)
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 self.delete_metadata()
metadata = VorbisComment.converted(metadata)
old_metadata = self.get_metadata()
metadata.vendor_string = old_metadata.vendor_string
# port REPLAYGAIN and ENCODER from old metadata to new metadata
for key in [u"REPLAYGAIN_TRACK_GAIN",
u"REPLAYGAIN_TRACK_PEAK",
u"REPLAYGAIN_ALBUM_GAIN",
u"REPLAYGAIN_ALBUM_PEAK",
u"REPLAYGAIN_REFERENCE_LOUDNESS",
u"ENCODER"]:
try:
metadata[key] = old_metadata[key]
except KeyError:
metadata[key] = []
self.update_metadata(metadata)
def get_metadata(self):
"""returns a MetaData object, or None
raises IOError if unable to read the file"""
from io import BytesIO
from audiotools.bitstream import BitstreamReader
from audiotools.ogg import PacketReader, PageReader
reader = PacketReader(PageReader(open(self.filename, "rb")))
identification = reader.read_packet()
comment = BitstreamReader(BytesIO(reader.read_packet()), True)
if (comment.read_bytes(8) == "OpusTags"):
vendor_string = \
comment.read_bytes(comment.read(32)).decode('utf-8')
comment_strings = [
comment.read_bytes(comment.read(32)).decode('utf-8')
for i in range(comment.read(32))
]
return VorbisComment(comment_strings, vendor_string)
else:
return None
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 self.delete_metadata()
metadata = VorbisComment.converted(metadata)
old_metadata = self.get_metadata()
metadata.vendor_string = old_metadata.vendor_string
# port REPLAYGAIN and ENCODER from old metadata to new metadata
for key in [
u"REPLAYGAIN_TRACK_GAIN", u"REPLAYGAIN_TRACK_PEAK",
u"REPLAYGAIN_ALBUM_GAIN", u"REPLAYGAIN_ALBUM_PEAK",
u"REPLAYGAIN_REFERENCE_LOUDNESS", u"ENCODER"
]:
try:
metadata[key] = old_metadata[key]
except KeyError:
metadata[key] = []
self.update_metadata(metadata)
def set_replay_gain(self, replaygain):
"""given a ReplayGain object, sets the track's gain to those values
may raise IOError if unable to modify the file"""
if replaygain is None:
return self.delete_replay_gain()
vorbis_comment = self.get_metadata()
if vorbis_comment is None:
from audiotools.vorbiscomment import VorbisComment
from audiotools import VERSION
vorbis_comment = VorbisComment([], u"Python Audio Tools %s" %
(VERSION))
vorbis_comment[u"REPLAYGAIN_TRACK_GAIN"] = [
u"%1.2f dB" % (replaygain.track_gain)
]
vorbis_comment[u"REPLAYGAIN_TRACK_PEAK"] = [
u"%1.8f" % (replaygain.track_peak)
]
vorbis_comment[u"REPLAYGAIN_ALBUM_GAIN"] = [
u"%1.2f dB" % (replaygain.album_gain)
]
vorbis_comment[u"REPLAYGAIN_ALBUM_PEAK"] = [
u"%1.8f" % (replaygain.album_peak)
]
vorbis_comment[u"REPLAYGAIN_REFERENCE_LOUDNESS"] = [u"89.0 dB"]
self.update_metadata(vorbis_comment)
