# GNU MediaGoblin -- federated, autonomous media hosting
-# Copyright (C) 2011 MediaGoblin contributors. See AUTHORS.
+# 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
import os
import sys
+import logging
+import tempfile
from mediagoblin import mg_globals
from mediagoblin.tools.translate import lazy_pass_to_ugettext as _
+_log = logging.getLogger(__name__)
class FileTypeNotSupported(Exception):
pass
pass
+def sniff_media(media):
+ '''
+ Iterate through the enabled media types and find those suited
+ for a certain file.
+ '''
+
+ try:
+ return get_media_type_and_manager(media.filename)
+ except FileTypeNotSupported:
+ _log.info('No media handler found by file extension. Doing it the expensive way...')
+ # Create a temporary file for sniffers suchs as GStreamer-based
+ # Audio video
+ media_file = tempfile.NamedTemporaryFile()
+ media_file.write(media.stream.read())
+ media.stream.seek(0)
+
+ for media_type, manager in get_media_managers():
+ _log.info('Sniffing {0}'.format(media_type))
+ if manager['sniff_handler'](media_file, media=media):
+ _log.info('{0} accepts the file'.format(media_type))
+ return media_type, manager
+ else:
+ _log.debug('{0} did not accept the file'.format(media_type))
+
+ raise FileTypeNotSupported(
+ # TODO: Provide information on which file types are supported
+ _(u'Sorry, I don\'t support that file type :('))
+
+
def get_media_types():
"""
Generator, yields the available media types
'''
for media_type in get_media_types():
__import__(media_type)
-
- yield media_type, sys.modules[media_type].MEDIA_MANAGER
-
-
-def get_media_manager(_media_type):
- '''
- Get the MEDIA_MANAGER based on a media type string
-
- Example::
- get_media_type('mediagoblin.media_types.image')
- '''
- if not _media_type:
- return False
- for media_type, manager in get_media_managers():
- if media_type in _media_type:
- return manager
-
- # Nope? Then raise an error
- raise FileTypeNotSupported(
- "MediaManager not in enabled types. Check media_types in config?")
+ yield media_type, sys.modules[media_type].MEDIA_MANAGER
def get_media_type_and_manager(filename):
'''
- Get the media type and manager based on a filename
+ Try to find the media type based on the file name, extension
+ specifically. This is used as a speedup, the sniffing functionality
+ then falls back on more in-depth bitsniffing of the source file.
'''
if filename.find('.') > 0:
# Get the file extension
ext = os.path.splitext(filename)[1].lower()
+
+ for media_type, manager in get_media_managers():
+ # Omit the dot from the extension and match it against
+ # the media manager
+ if ext[1:] in manager['accepted_extensions']:
+ return media_type, manager
else:
- raise InvalidFileType(
- _(u'Could not extract any file extension from "{filename}"').format(
- filename=filename))
-
- for media_type, manager in get_media_managers():
- # Omit the dot from the extension and match it against
- # the media manager
- if ext[1:] in manager['accepted_extensions']:
- return media_type, manager
- else:
- raise FileTypeNotSupported(
- # TODO: Provide information on which file types are supported
- _(u'Sorry, I don\'t support that file type :('))
+ _log.info('File {0} has no file extension, let\'s hope the sniffers get it.'.format(
+ filename))
+
+ raise FileTypeNotSupported(
+ _(u'Sorry, I don\'t support that file type :('))