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# PiTiVi , Non-linear video editor
#
# pitivi/sourcelist.py
#
# Copyright (c) 2005, Edward Hervey <bilboed@bilboed.com>
# Copyright (c) 2009, Alessandro Decina <alessandro.d@gmail.com>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this program; if not, write to the
# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.
"""
Handles the list of source for a project
"""
import urllib
from pitivi.discoverer import Discoverer
from pitivi.signalinterface import Signallable
from pitivi.log.loggable import Loggable
class SourceListError(Exception):
pass
class SourceList(Signallable, Loggable):
discovererClass = Discoverer
"""
Contains the sources for a project, stored as SourceFactory objects.
@ivar discoverer: The discoverer object used internally
@type discoverer: L{Discoverer}
Signals:
- C{source-added} : A source has been discovered and added to the SourceList.
- C{source-removed} : A source was removed from the SourceList.
- C{missing-plugins} : A source has been discovered but some plugins are
missing in order to decode all of its streams.
- C{discovery-error} : The given uri is not a media file.
- C{ready} : No more files are being discovered/added.
- C{starting} : Some files are being discovered/added.
"""
__signals__ = {
"ready" : [],
"starting" : [],
"missing-plugins": ["uri", "factory", "details", "descriptions"],
"source-added" : ["factory"],
"source-removed" : ["uri"],
"discovery-error" : ["uri", "reason"],
}
def __init__(self):
Loggable.__init__(self)
Signallable.__init__(self)
self._sources = {}
self._ordered_sources = []
self.discoverer = self.discovererClass()
self.discoverer.connect("discovery-error", self._discoveryErrorCb)
self.discoverer.connect("discovery-done", self._discoveryDoneCb)
self.discoverer.connect("starting", self._discovererStartingCb)
self.discoverer.connect("ready", self._discovererReadyCb)
self.discoverer.connect("missing-plugins",
self._discovererMissingPluginsCb)
def addUri(self, uri):
"""
Add c{uri} to the source list.
The uri will be analyzed before being added.
"""
if uri in self._sources:
raise SourceListError("URI already present in the source list", uri)
uri = urllib.unquote(uri)
self._sources[uri] = None
self.discoverer.addUri(uri)
def addUris(self, uris):
"""
Add c{uris} to the source list.
The uris will be analyzed before being added.
"""
for uri in uris:
self.addUri(uri)
def removeUri(self, uri):
"""
Remove the factory for c{uri} from the source list.
"""
try:
factory = self._sources.pop(uri)
except KeyError:
raise SourceListError("URI not in the sourcelist", uri)
try:
self._ordered_sources.remove(factory)
except ValueError:
# this can only happen if discoverer hasn't finished scanning the
# source, so factory must be None
assert factory is None
self.emit("source-removed", uri, factory)
def getUri(self, uri):
"""
Get the source corresponding to C{uri}.
"""
factory = self._sources.get(uri, None)
if factory is None:
raise SourceListError("URI not in the sourcelist", uri)
return factory
def addFactory(self, factory):
"""
Add an objectfactory for the given uri.
"""
if self._sources.get(factory.uri, None) is not None:
raise SourceListError("We already have a factory for this uri",
factory.uri)
self._sources[factory.uri] = factory
self._ordered_sources.append(factory)
self.emit("source-added", factory)
def getSources(self):
""" Returns the list of sources used.
The list will be ordered by the order in which they were added
"""
return self._ordered_sources
def _discoveryDoneCb(self, discoverer, uri, factory):
if factory.uri not in self._sources:
# the source was removed while it was being scanned
return
self.addFactory(factory)
def _discoveryErrorCb(self, discoverer, uri, reason, extra):
try:
del self._sources[uri]
except KeyError:
# the source was removed while it was being scanned
pass
self.emit("discovery-error", uri, reason, extra)
def _discovererStartingCb(self, unused_discoverer):
self.emit("starting")
def _discovererReadyCb(self, unused_discoverer):
self.emit("ready")
def _discovererMissingPluginsCb(self, discoverer, uri, factory,
details, descriptions, missingPluginsCallback):
if factory.uri not in self._sources:
# the source was removed while it was being scanned
return None
return self.emit('missing-plugins', uri, factory,
details, descriptions, missingPluginsCallback)
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