mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-29 03:30:35 +00:00
f50c68d4e2
GStreamer plugins written in python need to call `Gst.init` to ensure that GStreamer is initialized so when loading a python plugin, we might be recursively calling `gst_init` which is not a good idea. Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/940 Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2737>
753 lines
20 KiB
Python
753 lines
20 KiB
Python
# -*- Mode: Python; py-indent-offset: 4 -*-
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# vim: tabstop=4 shiftwidth=4 expandtab
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#
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# Gst.py
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#
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# Copyright (C) 2012 Thibault Saunier <thibault.saunier@collabora.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., 51 Franklin Street, Fifth Floor,
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# Boston, MA 02110-1301, USA.
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#
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# SPDX-License-Identifier: LGPL-2.0-or-later
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import sys
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import inspect
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import itertools
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import weakref
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from ..overrides import override
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from ..module import get_introspection_module
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from gi.repository import GLib
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Gst = get_introspection_module('Gst')
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__all__ = []
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if Gst._version == '0.10':
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import warnings
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warn_msg = "You have imported the Gst 0.10 module. Because Gst 0.10 \
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was not designed for use with introspection some of the \
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interfaces and API will fail. As such this is not supported \
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by the GStreamer development team and we encourage you to \
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port your app to Gst 1 or greater. gst-python is the recommended \
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python module to use with Gst 0.10"
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warnings.warn(warn_msg, RuntimeWarning)
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class Element(Gst.Element):
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@staticmethod
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def link_many(*args):
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'''
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@raises: Gst.LinkError
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'''
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for pair in pairwise(args):
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if not pair[0].link(pair[1]):
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raise LinkError(
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'Failed to link {} and {}'.format(pair[0], pair[1]))
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Element = override(Element)
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__all__.append('Element')
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class Bin(Gst.Bin):
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def __init__(self, name=None):
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Gst.Bin.__init__(self, name=name)
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def add(self, *args):
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for arg in args:
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if not Gst.Bin.add(self, arg):
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raise AddError(arg)
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def make_and_add(self, factory_name, instance_name=None):
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'''
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@raises: Gst.AddError
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'''
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elem = Gst.ElementFactory.make(factory_name, instance_name)
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if not elem:
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raise AddError(
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'No such element: {}'.format(factory_name))
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self.add(elem)
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return elem
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Bin = override(Bin)
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__all__.append('Bin')
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class Caps(Gst.Caps):
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def __nonzero__(self):
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return not self.is_empty()
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def __new__(cls, *args):
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if not args:
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return Caps.new_empty()
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elif len(args) > 1:
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raise TypeError("wrong arguments when creating GstCaps object")
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elif isinstance(args[0], str):
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return Caps.from_string(args[0])
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elif isinstance(args[0], Caps):
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return args[0].copy()
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elif isinstance(args[0], Structure):
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res = Caps.new_empty()
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res.append_structure(args[0])
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return res
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elif isinstance(args[0], (list, tuple)):
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res = Caps.new_empty()
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for e in args[0]:
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res.append_structure(e)
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return res
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raise TypeError("wrong arguments when creating GstCaps object")
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def __init__(self, *args, **kwargs):
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return super(Caps, self).__init__()
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def __str__(self):
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return self.to_string()
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def __getitem__(self, index):
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if index >= self.get_size():
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raise IndexError('structure index out of range')
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return self.get_structure(index)
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def __len__(self):
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return self.get_size()
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Caps = override(Caps)
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__all__.append('Caps')
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class PadFunc:
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def __init__(self, func):
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self.func = func
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def __call__(self, pad, parent, obj):
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if isinstance(self.func, weakref.WeakMethod):
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func = self.func()
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else:
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func = self.func
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try:
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res = func(pad, obj)
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except TypeError:
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try:
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res = func(pad, parent, obj)
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except TypeError:
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raise TypeError("Invalid method %s, 2 or 3 arguments required"
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% func)
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return res
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class Pad(Gst.Pad):
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def __init__(self, *args, **kwargs):
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super(Gst.Pad, self).__init__(*args, **kwargs)
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def set_chain_function(self, func):
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self.set_chain_function_full(PadFunc(func), None)
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def set_event_function(self, func):
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self.set_event_function_full(PadFunc(func), None)
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def set_query_function(self, func):
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self.set_query_function_full(PadFunc(func), None)
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def query_caps(self, filter=None):
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return Gst.Pad.query_caps(self, filter)
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def set_caps(self, caps):
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if not isinstance(caps, Gst.Caps):
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raise TypeError("%s is not a Gst.Caps." % (type(caps)))
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if not caps.is_fixed():
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return False
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event = Gst.Event.new_caps(caps)
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if self.direction == Gst.PadDirection.SRC:
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res = self.push_event(event)
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else:
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res = self.send_event(event)
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return res
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def link(self, pad):
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ret = Gst.Pad.link(self, pad)
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if ret != Gst.PadLinkReturn.OK:
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raise LinkError(ret)
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return ret
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Pad = override(Pad)
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__all__.append('Pad')
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class GhostPad(Gst.GhostPad):
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def __init__(self, name, target=None, direction=None):
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if direction is None:
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if target is None:
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raise TypeError('you must pass at least one of target '
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'and direction')
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direction = target.props.direction
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Gst.GhostPad.__init__(self, name=name, direction=direction)
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self.construct()
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if target is not None:
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self.set_target(target)
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def query_caps(self, filter=None):
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return Gst.GhostPad.query_caps(self, filter)
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GhostPad = override(GhostPad)
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__all__.append('GhostPad')
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class IteratorError(Exception):
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pass
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__all__.append('IteratorError')
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class AddError(Exception):
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pass
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__all__.append('AddError')
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class LinkError(Exception):
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pass
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__all__.append('LinkError')
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class MapError(Exception):
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pass
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__all__.append('MapError')
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class Iterator(Gst.Iterator):
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def __iter__(self):
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while True:
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result, value = self.next()
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if result == Gst.IteratorResult.DONE:
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break
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if result != Gst.IteratorResult.OK:
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raise IteratorError(result)
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yield value
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Iterator = override(Iterator)
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__all__.append('Iterator')
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class ElementFactory(Gst.ElementFactory):
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# ElementFactory
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def get_longname(self):
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return self.get_metadata("long-name")
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def get_description(self):
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return self.get_metadata("description")
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def get_klass(self):
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return self.get_metadata("klass")
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@classmethod
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def make(cls, factory_name, instance_name=None):
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return Gst.ElementFactory.make(factory_name, instance_name)
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class Pipeline(Gst.Pipeline):
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def __init__(self, name=None):
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Gst.Pipeline.__init__(self, name=name)
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Pipeline = override(Pipeline)
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__all__.append('Pipeline')
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class Structure(Gst.Structure):
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def __new__(cls, *args, **kwargs):
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if not args:
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if kwargs:
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raise TypeError("wrong arguments when creating GstStructure, first argument"
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" must be the structure name.")
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return Structure.new_empty()
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elif len(args) > 1:
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raise TypeError("wrong arguments when creating GstStructure object")
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elif isinstance(args[0], str):
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if not kwargs:
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return Structure.from_string(args[0])[0]
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struct = Structure.new_empty(args[0])
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for k, v in kwargs.items():
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struct[k] = v
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return struct
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elif isinstance(args[0], Structure):
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return args[0].copy()
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raise TypeError("wrong arguments when creating GstStructure object")
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def __init__(self, *args, **kwargs):
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pass
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def __getitem__(self, key):
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return self.get_value(key)
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def keys(self):
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keys = set()
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def foreach(fid, value, unused1, udata):
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keys.add(GLib.quark_to_string(fid))
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return True
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self.foreach(foreach, None, None)
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return keys
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def __setitem__(self, key, value):
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return self.set_value(key, value)
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def __str__(self):
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return self.to_string()
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Structure = override(Structure)
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__all__.append('Structure')
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ElementFactory = override(ElementFactory)
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__all__.append('ElementFactory')
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class Fraction(Gst.Fraction):
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def __init__(self, num, denom=1):
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def __gcd(a, b):
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while b != 0:
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tmp = a
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a = b
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b = tmp % b
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return abs(a)
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def __simplify():
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num = self.num
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denom = self.denom
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if num < 0:
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num = -num
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denom = -denom
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# Compute greatest common divisor
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gcd = __gcd(num, denom)
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if gcd != 0:
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num /= gcd
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denom /= gcd
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self.num = num
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self.denom = denom
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self.num = num
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self.denom = denom
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__simplify()
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self.type = "fraction"
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def __repr__(self):
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return '<Gst.Fraction %s>' % (str(self))
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def __value__(self):
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return self.num / self.denom
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def __eq__(self, other):
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if isinstance(other, Fraction):
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return self.num * other.denom == other.num * self.denom
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return False
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def __ne__(self, other):
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return not self.__eq__(other)
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def __mul__(self, other):
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if isinstance(other, Fraction):
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return Fraction(self.num * other.num,
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self.denom * other.denom)
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elif isinstance(other, int):
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return Fraction(self.num * other, self.denom)
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raise TypeError("%s is not supported, use Gst.Fraction or int." %
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(type(other)))
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__rmul__ = __mul__
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def __truediv__(self, other):
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if isinstance(other, Fraction):
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return Fraction(self.num * other.denom,
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self.denom * other.num)
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elif isinstance(other, int):
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return Fraction(self.num, self.denom * other)
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return TypeError("%s is not supported, use Gst.Fraction or int." %
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(type(other)))
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__div__ = __truediv__
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def __rtruediv__(self, other):
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if isinstance(other, int):
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return Fraction(self.denom * other, self.num)
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return TypeError("%s is not an int." % (type(other)))
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__rdiv__ = __rtruediv__
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def __float__(self):
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return float(self.num) / float(self.denom)
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def __str__(self):
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return '%d/%d' % (self.num, self.denom)
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Fraction = override(Fraction)
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__all__.append('Fraction')
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class IntRange(Gst.IntRange):
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def __init__(self, r):
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if not isinstance(r, range):
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raise TypeError("%s is not a range." % (type(r)))
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if (r.start >= r.stop):
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raise TypeError("Range start must be smaller then stop")
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if r.start % r.step != 0:
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raise TypeError("Range start must be a multiple of the step")
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if r.stop % r.step != 0:
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raise TypeError("Range stop must be a multiple of the step")
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self.range = r
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def __repr__(self):
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return '<Gst.IntRange [%d,%d,%d]>' % (self.range.start,
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self.range.stop, self.range.step)
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def __str__(self):
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if self.range.step == 1:
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return '[%d,%d]' % (self.range.start, self.range.stop)
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else:
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return '[%d,%d,%d]' % (self.range.start, self.range.stop,
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self.range.step)
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def __eq__(self, other):
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if isinstance(other, range):
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return self.range == other
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elif isinstance(other, IntRange):
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return self.range == other.range
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return False
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if sys.version_info >= (3, 0):
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IntRange = override(IntRange)
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__all__.append('IntRange')
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class Int64Range(Gst.Int64Range):
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def __init__(self, r):
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if not isinstance(r, range):
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raise TypeError("%s is not a range." % (type(r)))
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if (r.start >= r.stop):
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raise TypeError("Range start must be smaller then stop")
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if r.start % r.step != 0:
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raise TypeError("Range start must be a multiple of the step")
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if r.stop % r.step != 0:
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raise TypeError("Range stop must be a multiple of the step")
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self.range = r
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def __repr__(self):
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return '<Gst.Int64Range [%d,%d,%d]>' % (self.range.start,
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self.range.stop, self.range.step)
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def __str__(self):
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if self.range.step == 1:
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return '(int64)[%d,%d]' % (self.range.start, self.range.stop)
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else:
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return '(int64)[%d,%d,%d]' % (self.range.start, self.range.stop,
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self.range.step)
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def __eq__(self, other):
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if isinstance(other, range):
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return self.range == other
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elif isinstance(other, IntRange):
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return self.range == other.range
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return False
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class Bitmask(Gst.Bitmask):
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def __init__(self, v):
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if not isinstance(v, int):
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raise TypeError("%s is not an int." % (type(v)))
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self.v = int(v)
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def __str__(self):
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return hex(self.v)
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def __eq__(self, other):
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return self.v == other
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Bitmask = override(Bitmask)
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__all__.append('Bitmask')
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if sys.version_info >= (3, 0):
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Int64Range = override(Int64Range)
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__all__.append('Int64Range')
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class DoubleRange(Gst.DoubleRange):
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def __init__(self, start, stop):
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self.start = float(start)
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self.stop = float(stop)
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if (start >= stop):
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raise TypeError("Range start must be smaller then stop")
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def __repr__(self):
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return '<Gst.DoubleRange [%s,%s]>' % (str(self.start), str(self.stop))
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def __str__(self):
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return '(double)[%s,%s]' % (str(self.range.start), str(self.range.stop))
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DoubleRange = override(DoubleRange)
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__all__.append('DoubleRange')
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class FractionRange(Gst.FractionRange):
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def __init__(self, start, stop):
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if not isinstance(start, Gst.Fraction):
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raise TypeError("%s is not a Gst.Fraction." % (type(start)))
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if not isinstance(stop, Gst.Fraction):
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raise TypeError("%s is not a Gst.Fraction." % (type(stop)))
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if (float(start) >= float(stop)):
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raise TypeError("Range start must be smaller then stop")
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self.start = start
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self.stop = stop
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def __repr__(self):
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return '<Gst.FractionRange [%s,%s]>' % (str(self.start),
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str(self.stop))
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def __str__(self):
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return '(fraction)[%s,%s]' % (str(self.start), str(self.stop))
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FractionRange = override(FractionRange)
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__all__.append('FractionRange')
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class ValueArray(Gst.ValueArray):
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def __init__(self, array):
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self.array = list(array)
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def __getitem__(self, index):
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return self.array[index]
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def __setitem__(self, index, value):
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self.array[index] = value
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def __len__(self):
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return len(self.array)
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def __str__(self):
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return '<' + ','.join(map(str,self.array)) + '>'
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def __repr__(self):
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return '<Gst.ValueArray %s>' % (str(self))
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|
|
ValueArray = override(ValueArray)
|
|
__all__.append('ValueArray')
|
|
|
|
|
|
class ValueList(Gst.ValueList):
|
|
def __init__(self, array):
|
|
self.array = list(array)
|
|
|
|
def __getitem__(self, index):
|
|
return self.array[index]
|
|
|
|
def __setitem__(self, index, value):
|
|
self.array[index] = value
|
|
|
|
def __len__(self):
|
|
return len(self.array)
|
|
|
|
def __str__(self):
|
|
return '{' + ','.join(map(str,self.array)) + '}'
|
|
|
|
def __repr__(self):
|
|
return '<Gst.ValueList %s>' % (str(self))
|
|
|
|
ValueList = override(ValueList)
|
|
__all__.append('ValueList')
|
|
|
|
# From https://docs.python.org/3/library/itertools.html
|
|
|
|
|
|
def pairwise(iterable):
|
|
a, b = itertools.tee(iterable)
|
|
next(b, None)
|
|
return zip(a, b)
|
|
|
|
class MapInfo:
|
|
def __init__(self):
|
|
self.memory = None
|
|
self.flags = Gst.MapFlags(0)
|
|
self.size = 0
|
|
self.maxsize = 0
|
|
self.data = None
|
|
self.user_data = None
|
|
self.__parent__ = None
|
|
|
|
def __iter__(self):
|
|
# Make it behave like a tuple similar to the PyGObject generated API for
|
|
# the `Gst.Buffer.map()` and friends.
|
|
for i in (self.__parent__ is not None, self):
|
|
yield i
|
|
|
|
def __enter__(self):
|
|
if not self.__parent__:
|
|
raise MapError('MappingError', 'Mapping was not successful')
|
|
|
|
return self
|
|
|
|
def __exit__(self, type, value, tb):
|
|
if not self.__parent__.unmap(self):
|
|
raise MapError('MappingError', 'Unmapping was not successful')
|
|
|
|
__all__.append("MapInfo")
|
|
|
|
class Buffer(Gst.Buffer):
|
|
|
|
def map_range(self, idx, length, flags):
|
|
mapinfo = MapInfo()
|
|
if (_gi_gst.buffer_override_map_range(self, mapinfo, idx, length, int(flags))):
|
|
mapinfo.__parent__ = self
|
|
|
|
return mapinfo
|
|
|
|
def map(self, flags):
|
|
mapinfo = MapInfo()
|
|
if _gi_gst.buffer_override_map(self, mapinfo, int(flags)):
|
|
mapinfo.__parent__ = self
|
|
|
|
return mapinfo
|
|
|
|
def unmap(self, mapinfo):
|
|
mapinfo.__parent__ = None
|
|
return _gi_gst.buffer_override_unmap(self, mapinfo)
|
|
|
|
Buffer = override(Buffer)
|
|
__all__.append('Buffer')
|
|
|
|
class Memory(Gst.Memory):
|
|
|
|
def map(self, flags):
|
|
mapinfo = MapInfo()
|
|
if (_gi_gst.memory_override_map(self, mapinfo, int(flags))):
|
|
mapinfo.__parent__ = self
|
|
|
|
return mapinfo
|
|
|
|
def unmap(self, mapinfo):
|
|
mapinfo.__parent__ = None
|
|
return _gi_gst.memory_override_unmap(self, mapinfo)
|
|
|
|
Memory = override(Memory)
|
|
__all__.append('Memory')
|
|
|
|
def TIME_ARGS(time):
|
|
if time == Gst.CLOCK_TIME_NONE:
|
|
return "CLOCK_TIME_NONE"
|
|
|
|
return "%u:%02u:%02u.%09u" % (time / (Gst.SECOND * 60 * 60),
|
|
(time / (Gst.SECOND * 60)) % 60,
|
|
(time / Gst.SECOND) % 60,
|
|
time % Gst.SECOND)
|
|
__all__.append('TIME_ARGS')
|
|
|
|
from gi.overrides import _gi_gst
|
|
_gi_gst
|
|
|
|
# maybe more python and less C some day if core turns a bit more introspection
|
|
# and binding friendly in the debug area
|
|
Gst.trace = _gi_gst.trace
|
|
Gst.log = _gi_gst.log
|
|
Gst.debug = _gi_gst.debug
|
|
Gst.info = _gi_gst.info
|
|
Gst.warning = _gi_gst.warning
|
|
Gst.error = _gi_gst.error
|
|
Gst.fixme = _gi_gst.fixme
|
|
Gst.memdump = _gi_gst.memdump
|
|
|
|
# Make sure PyGst is not usable if GStreamer has not been initialized
|
|
class NotInitialized(Exception):
|
|
pass
|
|
__all__.append('NotInitialized')
|
|
|
|
def fake_method(*args):
|
|
raise NotInitialized("Please call Gst.init(argv) before using GStreamer")
|
|
|
|
|
|
real_functions = [o for o in inspect.getmembers(Gst) if isinstance(o[1], type(Gst.init))]
|
|
|
|
class_methods = []
|
|
for cname_klass in [o for o in inspect.getmembers(Gst) if isinstance(o[1], type(Gst.Element)) or isinstance(o[1], type(Gst.Caps))]:
|
|
class_methods.append((cname_klass,
|
|
[(o, cname_klass[1].__dict__[o])
|
|
for o in cname_klass[1].__dict__
|
|
if isinstance(cname_klass[1].__dict__[o], type(Gst.init))]))
|
|
|
|
def init_pygst():
|
|
for fname, function in real_functions:
|
|
if fname not in ["init", "init_check", "deinit"]:
|
|
setattr(Gst, fname, function)
|
|
|
|
for cname_class, methods in class_methods:
|
|
for mname, method in methods:
|
|
setattr(cname_class[1], mname, method)
|
|
|
|
|
|
def deinit_pygst():
|
|
for fname, func in real_functions:
|
|
if fname not in ["init", "init_check", "deinit", "is_initialized"]:
|
|
setattr(Gst, fname, fake_method)
|
|
for cname_class, methods in class_methods:
|
|
for mname, method in methods:
|
|
setattr(cname_class[1], mname, fake_method)
|
|
|
|
real_init = Gst.init
|
|
def init(argv):
|
|
init_pygst()
|
|
|
|
if Gst.is_initialized():
|
|
return True
|
|
|
|
return real_init(argv)
|
|
|
|
Gst.init = init
|
|
|
|
real_init_check = Gst.init_check
|
|
def init_check(argv):
|
|
init_pygst()
|
|
if Gst.is_initialized():
|
|
return True
|
|
|
|
return real_init_check(argv)
|
|
|
|
Gst.init_check = init_check
|
|
|
|
real_deinit = Gst.deinit
|
|
def deinit():
|
|
deinit_pygst()
|
|
return real_deinit()
|
|
|
|
Gst.deinit = deinit
|
|
|
|
if not Gst.is_initialized():
|
|
deinit_pygst()
|