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# -*- Mode: Python; py-indent-offset: 4 -*-
# vim: tabstop=4 shiftwidth=4 expandtab
#
# Gst.py
#
# Copyright (C) 2012 Thibault Saunier <thibault.saunier@collabora.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., 51 Franklin Street, Fifth Floor,
# Boston, MA 02110-1301, USA.
#
# SPDX-License-Identifier: LGPL-2.0-or-later
import sys
import inspect
import itertools
import weakref
from ..overrides import override
from ..module import get_introspection_module
from gi.repository import GLib, GObject
Gst = get_introspection_module('Gst')
__all__ = []
if Gst._version == '0.10':
import warnings
warn_msg = "You have imported the Gst 0.10 module. Because Gst 0.10 \
was not designed for use with introspection some of the \
interfaces and API will fail. As such this is not supported \
by the GStreamer development team and we encourage you to \
port your app to Gst 1 or greater. gst-python is the recommended \
python module to use with Gst 0.10"
warnings.warn(warn_msg, RuntimeWarning)
class Float(float):
'''
A wrapper to force conversion to G_TYPE_FLOAT instead of G_TYPE_DOUBLE when
used in e.g. Gst.ValueArray.
'''
__gtype__ = GObject.TYPE_FLOAT
__all__.append('Float')
# Ensuring that PyGObject loads the URIHandler interface
# so we can force our own implementation soon enough (in gstmodule.c)
class URIHandler(Gst.URIHandler):
pass
URIHandler = override(URIHandler)
__all__.append('URIHandler')
class Element(Gst.Element):
@staticmethod
def link_many(*args):
'''
@raises: Gst.LinkError
'''
for pair in pairwise(args):
if not pair[0].link(pair[1]):
raise LinkError(
'Failed to link {} and {}'.format(pair[0], pair[1]))
Element = override(Element)
__all__.append('Element')
class Bin(Gst.Bin):
def __init__(self, name=None):
Gst.Bin.__init__(self, name=name)
def add(self, *args):
for arg in args:
if not Gst.Bin.add(self, arg):
raise AddError(arg)
def make_and_add(self, factoryname, name=None):
'''
@raises: Gst.AddError
'''
elem = Gst.ElementFactory.make(factoryname, name)
if not elem:
raise AddError(
'No such element: {}'.format(factoryname))
self.add(elem)
return elem
Bin = override(Bin)
__all__.append('Bin')
class NotWritableMiniObject(Exception):
pass
__all__.append('NotWritableMiniObject')
class MiniObject:
def make_writable(self):
return _gi_gst.mini_object_make_writable(self)
def is_writable(self):
return _gi_gst.mini_object_is_writable(self)
@property
def flags(self):
return _gi_gst.mini_object_flags(self)
@flags.setter
def flags(self, flags):
_gi_gst.mini_object_set_flags(self, flags)
class NotWritableQuery(Exception):
pass
__all__.append('NotWritableQuery')
class Query(MiniObject, Gst.Query):
def get_structure(self):
s = _gi_gst.query_get_structure(self)
return s._set_parent(self) if s is not None else None
def writable_structure(self):
return StructureWrapper(_gi_gst.query_writable_structure(self)._set_parent(self))
Query = override(Query)
__all__.append('Query')
class NotWritableEvent(Exception):
pass
__all__.append('NotWritableEvent')
class Event(MiniObject, Gst.Event):
def get_structure(self):
s = _gi_gst.event_get_structure(self)
return s._set_parent(self) if s is not None else None
def writable_structure(self):
return StructureWrapper(_gi_gst.event_writable_structure(self)._set_parent(self))
Event = override(Event)
__all__.append('Event')
class NotWritableContext(Exception):
pass
__all__.append('NotWritableContext')
class Context(MiniObject, Gst.Context):
def get_structure(self):
s = _gi_gst.context_get_structure(self)
return s._set_parent(self) if s is not None else None
def writable_structure(self):
return StructureWrapper(_gi_gst.context_writable_structure(self)._set_parent(self))
Context = override(Context)
__all__.append('Context')
class NotWritableCaps(Exception):
pass
__all__.append('NotWritableCaps')
class NotWritableStructure(Exception):
pass
__all__.append('NotWritableStructure')
class Caps(MiniObject, Gst.Caps):
def __nonzero__(self):
return not self.is_empty()
def __new__(cls, *args):
if not args:
return Caps.new_empty()
if len(args) > 1:
raise TypeError("wrong arguments when creating GstCaps object")
assert len(args) == 1
if isinstance(args[0], str):
return Caps.from_string(args[0])
elif isinstance(args[0], Caps):
return args[0].copy()
elif isinstance(args[0], Structure):
res = Caps.new_empty()
res.append_structure(args[0])
return res
elif isinstance(args[0], (list, tuple)):
res = Caps.new_empty()
for e in args[0]:
res.append_structure(e)
return res
raise TypeError("wrong arguments when creating GstCaps object")
def __init__(self, *args, **kwargs):
return super(Caps, self).__init__()
def __str__(self):
return self.to_string()
def __getitem__(self, index):
if index >= self.get_size():
raise IndexError('structure index out of range')
return Gst.Caps.get_structure(self, index)
def __len__(self):
return self.get_size()
def get_structure(self, index):
s = _gi_gst.caps_get_structure(self, index)
return s._set_parent(self) if s is not None else None
def writable_structure(self, index):
return StructureWrapper(_gi_gst.caps_writable_structure(self, index)._set_parent(self))
Caps = override(Caps)
__all__.append('Caps')
class PadFunc:
def __init__(self, func):
self.func = func
def __call__(self, pad, parent, obj):
if isinstance(self.func, weakref.WeakMethod):
func = self.func()
else:
func = self.func
try:
res = func(pad, obj)
except TypeError:
try:
res = func(pad, parent, obj)
except TypeError:
raise TypeError("Invalid method %s, 2 or 3 arguments required"
% func)
return res
class Pad(Gst.Pad):
def __init__(self, *args, **kwargs):
super(Gst.Pad, self).__init__(*args, **kwargs)
def set_chain_function(self, func):
self.set_chain_function_full(PadFunc(func), None)
def set_event_function(self, func):
self.set_event_function_full(PadFunc(func), None)
def set_query_function(self, func):
self.set_query_function_full(PadFunc(func), None)
def query_caps(self, filter=None):
return Gst.Pad.query_caps(self, filter)
def set_caps(self, caps):
if not isinstance(caps, Gst.Caps):
raise TypeError("%s is not a Gst.Caps." % (type(caps)))
if not caps.is_fixed():
return False
event = Gst.Event.new_caps(caps)
if self.direction == Gst.PadDirection.SRC:
res = self.push_event(event)
else:
res = self.send_event(event)
return res
def link(self, pad):
ret = Gst.Pad.link(self, pad)
if ret != Gst.PadLinkReturn.OK:
raise LinkError(ret)
return ret
Pad = override(Pad)
__all__.append('Pad')
class GhostPad(Gst.GhostPad):
def __init__(self, name, target=None, direction=None):
if direction is None:
if target is None:
raise TypeError('you must pass at least one of target '
'and direction')
direction = target.props.direction
Gst.GhostPad.__init__(self, name=name, direction=direction)
self.construct()
if target is not None:
self.set_target(target)
def query_caps(self, filter=None):
return Gst.GhostPad.query_caps(self, filter)
GhostPad = override(GhostPad)
__all__.append('GhostPad')
class IteratorError(Exception):
pass
__all__.append('IteratorError')
class AddError(Exception):
pass
__all__.append('AddError')
class LinkError(Exception):
pass
__all__.append('LinkError')
class MapError(Exception):
pass
__all__.append('MapError')
class Iterator(Gst.Iterator):
def __iter__(self):
while True:
result, value = self.next()
if result == Gst.IteratorResult.DONE:
break
if result != Gst.IteratorResult.OK:
raise IteratorError(result)
yield value
Iterator = override(Iterator)
__all__.append('Iterator')
class ElementFactory(Gst.ElementFactory):
# ElementFactory
def get_longname(self):
return self.get_metadata("long-name")
def get_description(self):
return self.get_metadata("description")
def get_klass(self):
return self.get_metadata("klass")
@classmethod
def make(cls, factoryname, name=None):
return Gst.ElementFactory.make(factoryname, name)
class Pipeline(Gst.Pipeline):
def __init__(self, name=None):
Gst.Pipeline.__init__(self, name=name)
Pipeline = override(Pipeline)
__all__.append('Pipeline')
class Structure(Gst.Structure):
def __new__(cls, *args, **kwargs):
if not args:
if kwargs:
raise TypeError("wrong arguments when creating GstStructure, first argument"
" must be the structure name.")
struct = Structure.new_empty()
return struct
elif len(args) > 1:
raise TypeError("wrong arguments when creating GstStructure object")
elif isinstance(args[0], str):
if not kwargs:
struct = Structure.from_string(args[0])[0]
return struct
struct = Structure.new_empty(args[0])
for k, v in kwargs.items():
struct[k] = v
return struct
elif isinstance(args[0], Structure):
struct = args[0].copy()
return struct
raise TypeError("wrong arguments when creating GstStructure object")
def __init__(self, *args, **kwargs):
pass
def __ptr__(self):
return _gi_gst._get_object_ptr(self)
def __getitem__(self, key):
return self.get_value(key)
def keys(self):
keys = set()
def foreach(fid, value, unused1, udata):
keys.add(GLib.quark_to_string(fid))
return True
self.foreach(foreach, None, None)
return keys
def __setitem__(self, key, value):
return self.set_value(key, value)
def set_value(self, key, value):
if not _gi_gst.structure_is_writable(self):
raise NotWritableStructure("Trying to write to a not writable structure."
" Make sure to use the right APIs to have access to structure"
" in a writable way.")
return Gst.Structure.set_value(self, key, value)
def __str__(self):
return self.to_string()
def _set_parent(self, parent):
self.__parent__ = parent
return self
def __enter__(self):
return self
def __exit__(self, _type, _value, _tb):
self._set_parent(None)
Structure = override(Structure)
__all__.append('Structure')
ElementFactory = override(ElementFactory)
__all__.append('ElementFactory')
class Fraction(Gst.Fraction):
def __init__(self, num, denom=1):
def __gcd(a, b):
while b != 0:
tmp = a
a = b
b = tmp % b
return abs(a)
def __simplify():
num = self.num
denom = self.denom
if num < 0:
num = -num
denom = -denom
# Compute greatest common divisor
gcd = __gcd(num, denom)
if gcd != 0:
num /= gcd
denom /= gcd
self.num = num
self.denom = denom
self.num = num
self.denom = denom
__simplify()
self.type = "fraction"
def __repr__(self):
return '<Gst.Fraction %s>' % (str(self))
def __value__(self):
return self.num / self.denom
def __eq__(self, other):
if isinstance(other, Fraction):
return self.num * other.denom == other.num * self.denom
return False
def __ne__(self, other):
return not self.__eq__(other)
def __mul__(self, other):
if isinstance(other, Fraction):
return Fraction(self.num * other.num,
self.denom * other.denom)
elif isinstance(other, int):
return Fraction(self.num * other, self.denom)
raise TypeError("%s is not supported, use Gst.Fraction or int." %
(type(other)))
__rmul__ = __mul__
def __truediv__(self, other):
if isinstance(other, Fraction):
return Fraction(self.num * other.denom,
self.denom * other.num)
elif isinstance(other, int):
return Fraction(self.num, self.denom * other)
return TypeError("%s is not supported, use Gst.Fraction or int." %
(type(other)))
__div__ = __truediv__
def __rtruediv__(self, other):
if isinstance(other, int):
return Fraction(self.denom * other, self.num)
return TypeError("%s is not an int." % (type(other)))
__rdiv__ = __rtruediv__
def __float__(self):
return float(self.num) / float(self.denom)
def __str__(self):
return '%d/%d' % (self.num, self.denom)
Fraction = override(Fraction)
__all__.append('Fraction')
class IntRange(Gst.IntRange):
def __init__(self, r):
if not isinstance(r, range):
raise TypeError("%s is not a range." % (type(r)))
if (r.start >= r.stop):
raise TypeError("Range start must be smaller then stop")
if r.start % r.step != 0:
raise TypeError("Range start must be a multiple of the step")
if r.stop % r.step != 0:
raise TypeError("Range stop must be a multiple of the step")
self.range = r
def __repr__(self):
return '<Gst.IntRange [%d,%d,%d]>' % (self.range.start,
self.range.stop, self.range.step)
def __str__(self):
if self.range.step == 1:
return '[%d,%d]' % (self.range.start, self.range.stop)
else:
return '[%d,%d,%d]' % (self.range.start, self.range.stop,
self.range.step)
def __eq__(self, other):
if isinstance(other, range):
return self.range == other
elif isinstance(other, IntRange):
return self.range == other.range
return False
if sys.version_info >= (3, 0):
IntRange = override(IntRange)
__all__.append('IntRange')
class Int64Range(Gst.Int64Range):
def __init__(self, r):
if not isinstance(r, range):
raise TypeError("%s is not a range." % (type(r)))
if (r.start >= r.stop):
raise TypeError("Range start must be smaller then stop")
if r.start % r.step != 0:
raise TypeError("Range start must be a multiple of the step")
if r.stop % r.step != 0:
raise TypeError("Range stop must be a multiple of the step")
self.range = r
def __repr__(self):
return '<Gst.Int64Range [%d,%d,%d]>' % (self.range.start,
self.range.stop, self.range.step)
def __str__(self):
if self.range.step == 1:
return '(int64)[%d,%d]' % (self.range.start, self.range.stop)
else:
return '(int64)[%d,%d,%d]' % (self.range.start, self.range.stop,
self.range.step)
def __eq__(self, other):
if isinstance(other, range):
return self.range == other
elif isinstance(other, IntRange):
return self.range == other.range
return False
class Bitmask(Gst.Bitmask):
def __init__(self, v):
if not isinstance(v, int):
raise TypeError("%s is not an int." % (type(v)))
self.v = int(v)
def __str__(self):
return hex(self.v)
def __eq__(self, other):
return self.v == other
Bitmask = override(Bitmask)
__all__.append('Bitmask')
if sys.version_info >= (3, 0):
Int64Range = override(Int64Range)
__all__.append('Int64Range')
class DoubleRange(Gst.DoubleRange):
def __init__(self, start, stop):
self.start = float(start)
self.stop = float(stop)
if (start >= stop):
raise TypeError("Range start must be smaller then stop")
def __repr__(self):
return '<Gst.DoubleRange [%s,%s]>' % (str(self.start), str(self.stop))
def __str__(self):
return '(double)[%s,%s]' % (str(self.range.start), str(self.range.stop))
DoubleRange = override(DoubleRange)
__all__.append('DoubleRange')
class FractionRange(Gst.FractionRange):
def __init__(self, start, stop):
if not isinstance(start, Gst.Fraction):
raise TypeError("%s is not a Gst.Fraction." % (type(start)))
if not isinstance(stop, Gst.Fraction):
raise TypeError("%s is not a Gst.Fraction." % (type(stop)))
if (float(start) >= float(stop)):
raise TypeError("Range start must be smaller then stop")
self.start = start
self.stop = stop
def __repr__(self):
return '<Gst.FractionRange [%s,%s]>' % (str(self.start),
str(self.stop))
def __str__(self):
return '(fraction)[%s,%s]' % (str(self.start), str(self.stop))
FractionRange = override(FractionRange)
__all__.append('FractionRange')
class ValueArray(Gst.ValueArray):
def __init__(self, array=[]):
self.array = list(array)
def append(self, item):
self.array.append(item)
def prepend(self, item):
self.array = [item] + self.array
@staticmethod
def append_value(this, item):
this.append(item)
@staticmethod
def prepend_value(this, item):
this.prepend(item)
@staticmethod
def get_size(this):
return len(this.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.ValueArray %s>' % (str(self))
ValueArray = override(ValueArray)
__all__.append('ValueArray')
class ValueList(Gst.ValueList):
def __init__(self, array=[]):
self.array = list(array)
def append(self, item):
self.array.append(item)
def prepend(self, item):
self.array = [item] + self.array
@staticmethod
def append_value(this, item):
this.append(item)
@staticmethod
def prepend_value(this, item):
this.prepend(item)
@staticmethod
def get_size(this):
return len(this.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')
class TagList(Gst.TagList):
def __init__(self):
Gst.TagList.__init__(self)
def __getitem__(self, index):
if index >= self.n_tags():
raise IndexError('taglist index out of range')
key = self.nth_tag_name(index)
(res, val) = Gst.TagList.copy_value(self, key)
if not res:
raise KeyError(f"tag {key} not found")
return val
def __setitem__(self, key, value):
self.add(Gst.TagMergeMode.REPLACE, key, value)
def keys(self):
keys = set()
def foreach(list, fid, value, udata):
keys.add(fid)
return True
self.foreach(foreach, None, None)
return keys
def enumerate(self):
return map(lambda k: (k, Gst.TagList.copy_value(self, k)[1]), self.keys())
def __len__(self):
return self.n_tags()
def __str__(self):
return self.to_string()
def __repr__(self):
return '<Gst.TagList %s>' % (str(self))
TagList = override(TagList)
__all__.append('TagList')
# 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 StructureWrapper:
"""A Gst.Structure wrapper to force usage of a context manager.
"""
def __init__(self, structure):
self.__structure = structure
def __enter__(self):
return self.__structure
def __exit__(self, _type, _value, _tb):
self.__structure._set_parent(None)
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(MiniObject, Gst.Buffer):
@property
def flags(self):
return _gi_gst.mini_object_flags(self)
@flags.setter
def flags(self, flags):
_gi_gst.mini_object_set_flags(self, flags)
@property
def dts(self):
return _gi_gst.buffer_get_dts(self)
@dts.setter
def dts(self, dts):
_gi_gst.buffer_set_dts(self, dts)
@property
def pts(self):
return _gi_gst.buffer_get_pts(self)
@pts.setter
def pts(self, pts):
_gi_gst.buffer_set_pts(self, pts)
@property
def duration(self):
return _gi_gst.buffer_get_duration(self)
@duration.setter
def duration(self, duration):
_gi_gst.buffer_set_duration(self, duration)
@property
def offset(self):
return _gi_gst.buffer_get_offset(self)
@offset.setter
def offset(self, offset):
_gi_gst.buffer_set_offset(self, offset)
@property
def offset_end(self):
return _gi_gst.buffer_get_offset_end(self)
@offset_end.setter
def offset_end(self, offset_end):
_gi_gst.buffer_set_offset_end(self, offset_end)
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))]))
pre_init_functions = set([
"init",
"init_check",
"deinit",
"is_initialized",
"debug_add_log_function",
"debug_add_ring_buffer_logger",
"debug_remove_log_function",
"debug_remove_log_function_by_data",
"debug_remove_ring_buffer_logger",
"debug_set_active",
"debug_set_color_mode",
"debug_set_color_mode_from_string",
"debug_set_colored",
"debug_set_default_threshold",
])
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 pre_init_functions:
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=None):
init_pygst()
if Gst.is_initialized():
return True
# FIXME: Workaround for pygobject handling nullability wrong
if argv is None:
argv = []
# FIXME: Workaround for pygobject handling nullability wrong
if argv is None:
argv = []
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()
def init_python():
if not Gst.is_initialized():
raise NotInitialized("Gst.init_python should never be called before GStreamer itself is initialized")
init_pygst()
Gst.deinit = deinit
Gst.init_python = init_python
if not Gst.is_initialized():
deinit_pygst()
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