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# GNU MediaGoblin -- federated, autonomous media hosting
# Copyright (C) 2011, 2012 MediaGoblin contributors. See AUTHORS.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from mediagoblin.db.base import Base
from sqlalchemy import (
Column, Integer, SmallInteger, ForeignKey)
from sqlalchemy.orm import relationship, backref
from mediagoblin.db.extratypes import JSONEncoded
from mediagoblin.media_types import video
BACKREF_NAME = "video__media_data"
class VideoData(Base):
"""
Attributes:
- media_entry: the originating media entry (of course)
- width: width of the transcoded video
- height: height of the transcoded video
- orig_metadata: A loose json structure containing metadata gstreamer
pulled from the original video.
This field is NOT GUARANTEED to exist!
Likely metadata extracted:
"videoheight", "videolength", "videowidth",
"audiorate", "audiolength", "audiochannels", "audiowidth",
"mimetype", "tags"
TODO: document the above better.
"""
__tablename__ = "video__mediadata"
# The primary key *and* reference to the main media_entry
media_entry = Column(Integer, ForeignKey('core__media_entries.id'),
primary_key=True)
get_media_entry = relationship("MediaEntry",
backref=backref(BACKREF_NAME, uselist=False,
cascade="all, delete-orphan"))
width = Column(SmallInteger)
height = Column(SmallInteger)
orig_metadata = Column(JSONEncoded)
def source_type(self):
"""
Construct a useful type=... that is to say, used like:
<video><source type="{{ entry.media_data.source_type() }}" /></video>
Try to construct it out of self.orig_metadata... if we fail we
just dope'ily fall back on DEFAULT_WEBM_TYPE
"""
orig_metadata = self.orig_metadata or {}
if ("webm_video" not in self.get_media_entry.media_files
and "mimetype" in orig_metadata.get('common', {}).get('tags', {})
and "codec" in orig_metadata['audio']
and "codec" in orig_metadata['video']):
if orig_metadata['mimetype'] == 'application/ogg':
# stupid ambiguous .ogg extension
mimetype = "video/ogg"
else:
mimetype = orig_metadata['common']['tags']['mimetype']
video_codec = orig_metadata["video"]["codec"].lower()
audio_codec = orig_metadata["audio"]["codec"].lower()
# We don't want the "video" at the end of vp8...
# not sure of a nicer way to be cleaning this stuff
if video_codec == "vp8 video":
video_codec = "vp8"
return '{}; codecs="{}, {}"'.format(
mimetype, video_codec, audio_codec)
else:
return video.VideoMediaManager.default_webm_type
DATA_MODEL = VideoData
MODELS = [VideoData]
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