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import base64
import mutagen
import mutagen.flac
from mediafile.utils import Image
from .base import ListStorageStyle
class VorbisImageStorageStyle(ListStorageStyle):
"""Store images in Vorbis comments. Both legacy COVERART fields and
modern METADATA_BLOCK_PICTURE tags are supported. Data is
base64-encoded. Values are `Image` objects.
"""
formats = ["OggOpus", "OggTheora", "OggSpeex", "OggVorbis", "OggFlac"]
def __init__(self):
super().__init__(key="metadata_block_picture")
self.as_type = bytes
def fetch(self, mutagen_file):
images = []
if "metadata_block_picture" not in mutagen_file:
# Try legacy COVERART tags.
if "coverart" in mutagen_file:
for data in mutagen_file["coverart"]:
images.append(Image(base64.b64decode(data)))
return images
for data in mutagen_file["metadata_block_picture"]:
try:
pic = mutagen.flac.Picture(base64.b64decode(data))
except (TypeError, AttributeError):
continue
images.append(Image(data=pic.data, desc=pic.desc, type=pic.type))
return images
def store(self, mutagen_file, image_data):
# Strip all art, including legacy COVERART.
if "coverart" in mutagen_file:
del mutagen_file["coverart"]
if "coverartmime" in mutagen_file:
del mutagen_file["coverartmime"]
super().store(mutagen_file, image_data)
def serialize(self, image):
"""Turn a Image into a base64 encoded FLAC picture block."""
pic = mutagen.flac.Picture()
pic.data = image.data
pic.type = image.type_index
pic.mime = image.mime_type
pic.desc = image.desc or ""
# Encoding with base64 returns bytes on both Python 2 and 3.
# Mutagen requires the data to be a Unicode string, so we decode
# it before passing it along.
return base64.b64encode(pic.write()).decode("ascii")
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