mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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249 lines
9.7 KiB
Python
249 lines
9.7 KiB
Python
# Copyright (c) 2020, Matthew Waters <matthew@centricular.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 St, Fifth Floor,
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# Boston, MA 02110-1301, USA.
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import threading
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import copy
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from observer import Signal, WebRTCObserver, DataChannelObserver, StateObserver
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from enums import NegotiationState, DataChannelState
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import gi
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gi.require_version("Gst", "1.0")
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from gi.repository import Gst
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gi.require_version("GstWebRTC", "1.0")
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from gi.repository import GstWebRTC
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gi.require_version("GstSdp", "1.0")
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from gi.repository import GstSdp
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gi.require_version("GstValidate", "1.0")
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from gi.repository import GstValidate
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class WebRTCBinObserver(WebRTCObserver):
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"""
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Observe a webrtcbin element.
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"""
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def __init__(self, element):
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WebRTCObserver.__init__(self)
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self.element = element
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self.signal_handlers = []
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self.signal_handlers.append(element.connect("on-negotiation-needed", self._on_negotiation_needed))
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self.signal_handlers.append(element.connect("on-ice-candidate", self._on_ice_candidate))
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self.signal_handlers.append(element.connect("pad-added", self._on_pad_added))
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self.signal_handlers.append(element.connect("on-new-transceiver", self._on_new_transceiver))
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self.signal_handlers.append(element.connect("on-data-channel", self._on_data_channel))
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self.negotiation_needed = 0
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self._negotiation_needed_observer = StateObserver(self, "negotiation_needed", threading.Condition())
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self.on_negotiation_needed = Signal()
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self.on_ice_candidate = Signal()
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self.on_pad_added = Signal()
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self.on_new_transceiver = Signal()
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def _on_negotiation_needed(self, element):
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self.negotiation_needed += 1
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self._negotiation_needed_observer.update(self.negotiation_needed)
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self.on_negotiation_needed.fire()
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def _on_ice_candidate(self, element, mline, candidate):
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self.on_ice_candidate.fire(mline, candidate)
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def _on_pad_added(self, element, pad):
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self.on_pad_added.fire(pad)
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def _on_description_set(self, promise, desc):
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new_state = self._update_negotiation_from_description_state(desc)
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if new_state == NegotiationState.OFFER_SET:
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self.on_offer_set.fire (desc)
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elif new_state == NegotiationState.ANSWER_SET:
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self.on_answer_set.fire (desc)
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def _on_new_transceiver(self, element, transceiver):
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self.on_new_transceiver.fire(transceiver)
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def _on_data_channel(self, element, channel):
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observer = WebRTCBinDataChannelObserver(channel, channel.props.label, 'remote')
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self.add_channel(observer)
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def _update_negotiation_from_description_state(self, desc):
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new_state = None
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if desc.type == GstWebRTC.WebRTCSDPType.OFFER:
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new_state = NegotiationState.OFFER_SET
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elif desc.type == GstWebRTC.WebRTCSDPType.ANSWER:
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new_state = NegotiationState.ANSWER_SET
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assert new_state is not None
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self._update_negotiation_state(new_state)
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return new_state
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def _deepcopy_session_description(self, desc):
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# XXX: passing 'offer' to both a promise and an action signal without
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# a deepcopy will segfault...
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new_sdp = GstSdp.SDPMessage.new()[1]
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GstSdp.sdp_message_parse_buffer(bytes(desc.sdp.as_text().encode()), new_sdp)
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return GstWebRTC.WebRTCSessionDescription.new(desc.type, new_sdp)
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def _on_offer_created(self, promise, element):
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self._update_negotiation_state(NegotiationState.OFFER_CREATED)
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reply = promise.get_reply()
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offer = reply['offer']
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new_offer = self._deepcopy_session_description(offer)
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promise = Gst.Promise.new_with_change_func(self._on_description_set, new_offer)
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new_offer = self._deepcopy_session_description(offer)
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self.element.emit('set-local-description', new_offer, promise)
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self.on_offer_created.fire(offer)
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def _on_answer_created(self, promise, element):
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self._update_negotiation_state(NegotiationState.ANSWER_CREATED)
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reply = promise.get_reply()
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offer = reply['answer']
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new_offer = self._deepcopy_session_description(offer)
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promise = Gst.Promise.new_with_change_func(self._on_description_set, new_offer)
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new_offer = self._deepcopy_session_description(offer)
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self.element.emit('set-local-description', new_offer, promise)
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self.on_answer_created.fire(offer)
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def create_offer(self, options=None):
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promise = Gst.Promise.new_with_change_func(self._on_offer_created, self.element)
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self.element.emit('create-offer', options, promise)
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def create_answer(self, options=None):
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promise = Gst.Promise.new_with_change_func(self._on_answer_created, self.element)
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self.element.emit('create-answer', options, promise)
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def set_remote_description(self, desc):
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promise = Gst.Promise.new_with_change_func(self._on_description_set, desc)
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self.element.emit('set-remote-description', desc, promise)
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def add_ice_candidate(self, mline, candidate):
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self.element.emit('add-ice-candidate', mline, candidate)
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def add_data_channel(self, ident):
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channel = self.element.emit('create-data-channel', ident, None)
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observer = WebRTCBinDataChannelObserver(channel, ident, 'local')
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self.add_channel(observer)
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def wait_for_negotiation_needed(self, generation):
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self._negotiation_needed_observer.wait_for ((generation,))
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class WebRTCStream(object):
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"""
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An stream attached to a webrtcbin element
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"""
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def __init__(self):
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self.bin = None
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def set_description(self, desc):
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assert self.bin is None
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self.bin = Gst.parse_bin_from_description(desc, True)
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def add_and_link(self, parent, link):
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assert self.bin is not None
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self.bin.set_locked_state(True)
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parent.add(self.bin)
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src = self.bin.get_static_pad("src")
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sink = self.bin.get_static_pad("sink")
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assert src is None or sink is None
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if src:
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self.bin.link(link)
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if sink:
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link.link(self.bin)
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self.bin.set_locked_state(False)
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self.bin.sync_state_with_parent()
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def add_and_link_to(self, parent, link, pad):
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assert self.bin is not None
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self.bin.set_locked_state(True)
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parent.add(self.bin)
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src = self.bin.get_static_pad("src")
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sink = self.bin.get_static_pad("sink")
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assert src is None or sink is None
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if pad.get_direction() == Gst.PadDirection.SRC:
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assert sink is not None
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pad.link(sink)
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if pad.get_direction() == Gst.PadDirection.SINK:
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assert src is not None
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src.link(pad)
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self.bin.set_locked_state(False)
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self.bin.sync_state_with_parent()
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class WebRTCClient(WebRTCBinObserver):
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"""
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Client for performing webrtc operations. Controls the pipeline that
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contains a webrtcbin element.
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"""
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def __init__(self):
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self.pipeline = Gst.Pipeline(None)
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self.webrtcbin = Gst.ElementFactory.make("webrtcbin")
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super().__init__(self.webrtcbin)
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self.pipeline.add(self.webrtcbin)
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self._streams = []
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def stop(self):
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self.pipeline.set_state (Gst.State.NULL)
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def add_stream(self, desc):
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stream = WebRTCStream()
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stream.set_description(desc)
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stream.add_and_link (self.pipeline, self.webrtcbin)
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self._streams.append(stream)
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def add_stream_with_pad(self, desc, pad):
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stream = WebRTCStream()
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stream.set_description(desc)
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stream.add_and_link_to (self.pipeline, self.webrtcbin, pad)
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self._streams.append(stream)
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def set_options (self, opts):
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if opts.has_field("local-bundle-policy"):
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self.webrtcbin.props.bundle_policy = opts["local-bundle-policy"]
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class WebRTCBinDataChannelObserver(DataChannelObserver):
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"""
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Data channel observer for a webrtcbin data channel.
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"""
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def __init__(self, target, ident, location):
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super().__init__(ident, location)
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self.target = target
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self.signal_handlers = []
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self.signal_handlers.append(target.connect("on-open", self._on_open))
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self.signal_handlers.append(target.connect("on-close", self._on_close))
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self.signal_handlers.append(target.connect("on-error", self._on_error))
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self.signal_handlers.append(target.connect("on-message-data", self._on_message_data))
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self.signal_handlers.append(target.connect("on-message-string", self._on_message_string))
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self.signal_handlers.append(target.connect("on-buffered-amount-low", self._on_buffered_amount_low))
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def _on_open(self, channel):
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self._update_state (DataChannelState.OPEN)
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def _on_close(self, channel):
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self._update_state (DataChannelState.CLOSED)
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def _on_error(self, channel):
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self._update_state (DataChannelState.ERROR)
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def _on_message_data(self, channel, data):
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self.data.append(msg)
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def _on_message_string(self, channel, msg):
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self.got_message (msg)
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def _on_buffered_amount_low(self, channel):
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pass
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def close(self):
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self.target.emit('close')
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def send_string (self, msg):
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self.target.emit('send-string', msg)
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