443 lines
15 KiB
Python
443 lines
15 KiB
Python
# -*- coding: utf-8 -*-
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# -*- Mode: Python; -*-
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# vi:si:et:sw=4:sts=4:ts=4
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#
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# pitivi/elements/singledecodebin.py
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#
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# Copyright (c) 2005, Edward Hervey <bilboed@bilboed.com>
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this program; if not, write to the
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# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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# Boston, MA 02111-1307, USA.
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"""
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Single-stream queue-less decodebin
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"""
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import gobject
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import gst
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class CachedFactoryList(object):
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def __init__(self, factoryFilter=None):
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self._factoryFilter = factoryFilter
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self._factories = None
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self._registry = gst.registry_get_default()
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self._registry.connect("feature-added", self._registryFeatureAddedCb)
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def get(self):
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if self._factories is None:
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self._buildFactories()
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return self._factories
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def _buildFactories(self):
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# build the cache
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#log.debug("utils", "Getting factories list")
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factories = self._registry.get_feature_list(gst.ElementFactory)
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if self._factoryFilter is not None:
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#log.debug("utils", "filtering")
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factories = filter(self._factoryFilter, factories)
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#log.debug("utils", "Sorting by rank")
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factories.sort(key=lambda factory: factory.get_rank(), reverse=True)
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self._factories = factories
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#log.debug("utils", "Cached factories is now %r", self._factories)
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def _registryFeatureAddedCb(self, registry, feature):
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# invalidate the cache
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#log.warning("utils", "New feature added, invalidating cached factories")
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self._factories = None
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def is_raw(caps):
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""" returns True if the caps are RAW """
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rep = caps.to_string()
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valid = ["video/x-raw", "audio/x-raw", "text/plain", "text/x-pango-markup"]
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for val in valid:
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if rep.startswith(val):
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return True
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return False
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def factoryFilter(factory):
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if factory.get_rank() < 64 :
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return False
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klass = factory.get_klass()
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for cat in ("Demuxer", "Decoder", "Parse"):
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if cat in klass:
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return True
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return False
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_factoryCache = CachedFactoryList(factoryFilter)
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class SingleDecodeBin(gst.Bin):
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"""
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A variant of decodebin.
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* Only outputs one stream
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* Doesn't contain any internal queue
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"""
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QUEUE_SIZE = 1 * gst.SECOND
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__gsttemplates__ = (
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gst.PadTemplate ("sinkpadtemplate",
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gst.PAD_SINK,
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gst.PAD_ALWAYS,
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gst.caps_new_any()),
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gst.PadTemplate ("srcpadtemplate",
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gst.PAD_SRC,
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gst.PAD_SOMETIMES,
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gst.caps_new_any())
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)
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def __init__(self, caps=None, uri=None, stream=None, *args, **kwargs):
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gst.Bin.__init__(self, *args, **kwargs)
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if not caps:
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caps = gst.caps_new_any()
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self.caps = caps
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self.stream = stream
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self.typefind = gst.element_factory_make("typefind", "internal-typefind")
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self.add(self.typefind)
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self.uri = uri
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if self.uri and gst.uri_is_valid(self.uri):
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self.urisrc = gst.element_make_from_uri(gst.URI_SRC, uri, "urisrc")
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self.log("created urisrc %s / %r" % (self.urisrc.get_name(),
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self.urisrc))
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self.add(self.urisrc)
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# Set the blocksize to 512kbytes, this will only matter for push-based sources
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if hasattr(self.urisrc.props, "blocksize"):
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self.urisrc.props.blocksize = 524288
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self.urisrc.link_pads_full("src", self.typefind, "sink",
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gst.PAD_LINK_CHECK_NOTHING)
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else:
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self._sinkpad = gst.GhostPad("sink", self.typefind.get_pad("sink"))
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self._sinkpad.set_active(True)
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self.add_pad(self._sinkpad)
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self.typefind.connect("have_type", self._typefindHaveTypeCb)
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self._srcpad = None
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self._dynamics = []
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self._validelements = [] #added elements
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self.debug("stream:%r" % self.stream)
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self.pending_newsegment = False
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self.eventProbeId = None
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## internal methods
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def _controlDynamicElement(self, element):
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self.log("element:%s" % element.get_name())
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self._dynamics.append(element)
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element.connect("pad-added", self._dynamicPadAddedCb)
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element.connect("no-more-pads", self._dynamicNoMorePadsCb)
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def _findCompatibleFactory(self, caps):
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"""
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Returns a list of factories (sorted by rank) which can take caps as
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input. Returns empty list if none are compatible
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"""
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self.debug("caps:%s" % caps.to_string())
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res = []
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for factory in _factoryCache.get():
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for template in factory.get_static_pad_templates():
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if template.direction == gst.PAD_SINK:
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intersect = caps.intersect(template.static_caps.get())
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if not intersect.is_empty():
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res.append(factory)
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break
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self.debug("returning %r" % res)
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return res
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def _closeLink(self, element):
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"""
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Inspects element and tries to connect something on the srcpads.
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If there are dynamic pads, it sets up a signal handler to
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continue autoplugging when they become available.
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"""
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to_connect = []
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dynamic = False
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templates = element.get_pad_template_list()
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for template in templates:
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if not template.direction == gst.PAD_SRC:
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continue
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if template.presence == gst.PAD_ALWAYS:
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pad = element.get_pad(template.name_template)
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to_connect.append(pad)
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elif template.presence == gst.PAD_SOMETIMES:
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pad = element.get_pad(template.name_template)
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if pad:
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to_connect.append(pad)
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else:
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dynamic = True
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else:
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self.log("Template %s is a request pad, ignoring" % pad.name_template)
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if dynamic:
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self.debug("%s is a dynamic element" % element.get_name())
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self._controlDynamicElement(element)
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for pad in to_connect:
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self._closePadLink(element, pad, pad.get_caps())
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def _isDemuxer(self, element):
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if not 'Demux' in element.get_factory().get_klass():
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return False
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potential_src_pads = 0
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for template in element.get_pad_template_list():
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if template.direction != gst.PAD_SRC:
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continue
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if template.presence == gst.PAD_REQUEST or \
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"%" in template.name_template:
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potential_src_pads += 2
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break
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else:
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potential_src_pads += 1
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return potential_src_pads > 1
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def _plugDecodingQueue(self, pad):
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queue = gst.element_factory_make("queue")
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queue.props.max_size_time = self.QUEUE_SIZE
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queue.props.max_size_buffers = 3
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self.add(queue)
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queue.sync_state_with_parent()
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pad.link_full(queue.get_pad("sink"), gst.PAD_LINK_CHECK_NOTHING)
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pad = queue.get_pad("src")
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return pad
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def _tryToLink1(self, source, pad, factories):
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"""
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Tries to link one of the factories' element to the given pad.
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Returns the element that was successfully linked to the pad.
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"""
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self.debug("source:%s, pad:%s , factories:%r" % (source.get_name(),
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pad.get_name(),
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factories))
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if self._isDemuxer(source):
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pad = self._plugDecodingQueue(pad)
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result = None
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for factory in factories:
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element = factory.create()
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if not element:
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self.warning("weren't able to create element from %r" % factory)
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continue
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sinkpad = element.get_pad("sink")
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if not sinkpad:
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continue
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self.add(element)
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element.set_state(gst.STATE_READY)
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try:
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pad.link(sinkpad)
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except:
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element.set_state(gst.STATE_NULL)
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self.remove(element)
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continue
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self._closeLink(element)
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element.set_state(gst.STATE_PAUSED)
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result = element
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break
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return result
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def _closePadLink(self, element, pad, caps):
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"""
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Finds the list of elements that could connect to the pad.
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If the pad has the desired caps, it will create a ghostpad.
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If no compatible elements could be found, the search will stop.
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"""
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self.debug("element:%s, pad:%s, caps:%s" % (element.get_name(),
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pad.get_name(),
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caps.to_string()))
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if caps.is_empty():
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self.log("unknown type")
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return
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if caps.is_any():
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self.log("type is not know yet, waiting")
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return
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self.debug("stream %r" % (self.stream))
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if caps.intersect(self.caps) and (self.stream is None or
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(self.stream.pad_name == get_pad_id(pad))):
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# This is the desired caps
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if not self._srcpad:
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self._wrapUp(element, pad)
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elif is_raw(caps) and pad_compatible_stream(pad, self.stream):
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self.log ("not the target stream, but compatible")
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if not self._srcpad:
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self._wrapUp(element, pad)
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elif is_raw(caps):
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self.log("We hit a raw caps which isn't the wanted one")
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# FIXME : recursively remove everything until demux/typefind
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else:
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# Find something
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if len(caps) > 1:
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self.log("many possible types, delaying")
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return
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facts = self._findCompatibleFactory(caps)
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if not facts:
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self.log("unknown type")
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return
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self._tryToLink1(element, pad, facts)
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def _wrapUp(self, element, pad):
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"""
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Ghost the given pad of element.
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Remove non-used elements.
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"""
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if self._srcpad:
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return
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self._markValidElements(element)
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gobject.idle_add(self._removeUnusedElements, self.typefind)
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if pad.props.caps is not None:
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caps = pad.props.caps
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else:
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caps = pad.get_caps()
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self._srcpad = gst.GhostPad("src", pad)
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self._srcpad.set_active(True)
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if caps.is_fixed():
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self._exposePad(target=pad)
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else:
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self._blockPad(target=pad)
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def _exposePad(self, target):
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self.log("ghosting pad %s" % target.get_name())
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self.add_pad(self._srcpad)
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self.post_message(gst.message_new_state_dirty(self))
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def _blockPad(self, target):
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# don't pass target as an argument to set_blocked_async. Avoids
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# triggering a bug in gst-python where pad_block_destroy_data calls
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# CPython without acquiring the GIL
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self._target = target
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self._eventProbeId = target.add_event_probe(self._padEventCb)
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self._srcpad.set_blocked_async(True, self._padBlockedCb)
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def _unblockPad(self, target):
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target.remove_event_probe(self._eventProbeId)
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self._eventProbeId = None
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self._srcpad.set_blocked_async(False, self._padBlockedCb)
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def _padBlockedCb(self, ghost, blocked):
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if not blocked:
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if self.pending_newsegment is not None:
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self._srcpad.push_event(self.pending_newsegment)
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self.pending_newsegment = None
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return
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self._exposePad(target=self._target)
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self._unblockPad(target=self._target)
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def _padEventCb(self, pad, event):
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if event.type == gst.EVENT_TAG:
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self.debug("dropping TAG event")
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return False
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if event.type != gst.EVENT_NEWSEGMENT:
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self.warning("first event: %s is not a NEWSEGMENT, bailing out" %
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event)
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self._exposePad(target=pad)
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self._unblockPad(target=pad)
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return True
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self.debug("stored pending newsegment")
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self.pending_newsegment = event
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return False
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def _markValidElements(self, element):
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"""
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Mark this element and upstreams as valid
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"""
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self.log("element:%s" % element.get_name())
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if element == self.typefind:
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return
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self._validelements.append(element)
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# find upstream element
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pad = list(element.sink_pads())[0]
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parent = pad.get_peer().get_parent()
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self._markValidElements(parent)
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def _removeUnusedElements(self, element):
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"""
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Remove unused elements connected to srcpad(s) of element
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"""
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self.log("element:%r" % element)
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for pad in list(element.src_pads()):
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if pad.is_linked():
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peer = pad.get_peer().get_parent()
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if isinstance(peer, gst.Element):
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self._removeUnusedElements(peer)
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if not peer in self._validelements:
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self.log("removing %s" % peer.get_name())
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pad.unlink(pad.get_peer())
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peer.set_state(gst.STATE_NULL)
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self.remove(peer)
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def _cleanUp(self):
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self.log("")
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if self._srcpad:
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self.remove_pad(self._srcpad)
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self._srcpad = None
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self._target = None
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for element in self._validelements:
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element.set_state(gst.STATE_NULL)
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self.remove(element)
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self._validelements = []
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## Overrides
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def do_change_state(self, transition):
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self.debug("transition:%r" % transition)
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res = gst.Bin.do_change_state(self, transition)
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if transition == gst.STATE_CHANGE_PAUSED_TO_READY:
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self._cleanUp()
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return res
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## Signal callbacks
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def _typefindHaveTypeCb(self, typefind, probability, caps):
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self.debug("probability:%d, caps:%s" % (probability, caps.to_string()))
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self._closePadLink(typefind, typefind.get_pad("src"), caps)
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## Dynamic element Callbacks
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def _dynamicPadAddedCb(self, element, pad):
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self.log("element:%s, pad:%s" % (element.get_name(), pad.get_name()))
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if not self._srcpad:
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self._closePadLink(element, pad, pad.get_caps())
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def _dynamicNoMorePadsCb(self, element):
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self.log("element:%s" % element.get_name())
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gobject.type_register(SingleDecodeBin)
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