First prototype of a functional laplace client.
authorPhilipp Spitzer <philipp@spitzer.priv.at>
Wed, 8 Jul 2020 21:10:42 +0000 (23:10 +0200)
committerPhilipp Spitzer <philipp@spitzer.priv.at>
Wed, 8 Jul 2020 21:35:27 +0000 (23:35 +0200)
laplace_client_2.py

index a43c5a607c1febd907d1883f71a1211d4bf64d76..a658a4ea27a1eb0da4ef7aadfff89ced674d43a0 100755 (executable)
 
 import argparse
 import asyncio
+import datetime
 import json
 import logging
 import pathlib
 import ssl
 import sys
-from typing import Optional
+from typing import Optional, List
 
 import websockets
 
 import gi
+
 gi.require_version('Gst', '1.0')
 from gi.repository import Gst
+
 gi.require_version('GstWebRTC', '1.0')
 from gi.repository import GstWebRTC
+
 gi.require_version('GstSdp', '1.0')
 from gi.repository import GstSdp
 
-
 log = logging.getLogger(__name__)
 
 
-sdp_offer: Optional[str] = None
-ice_candidates = []
-
-
-async def listen_to_gstreamer_bus():
-    global sdp_offer, ice_candidates
-    Gst.init(None)
-    webrtcbin = Gst.ElementFactory.make('webrtcbin', 'laplace')
-    pipe = Gst.Pipeline.new("pipeline")
-    Gst.Bin.do_add_element(pipe, webrtcbin)
-    bus = Gst.Pipeline.get_bus(pipe)
-    pipe.set_state(Gst.State.PLAYING)
-    try:
-        while True:
-            if bus.have_pending():
-                msg = bus.pop()  # Gst.Message, has to be unref'ed.
-                log.info(f'Receive Gst.Message: {msg.type}')
-                # Gst.Message.unref(msg)
-            elif sdp_offer is not None:
-                res, sm = GstSdp.SDPMessage.new()
-                assert res == GstSdp.SDPResult.OK
-                GstSdp.sdp_message_parse_buffer(bytes(sdp_offer.encode()), sm)
-                # the three lines above can also be done this way in new versions of GStreamer:
-                # sm = GstSdp.SDPMessage.new_from_text(sdp_offer)
-                rd = GstWebRTC.WebRTCSessionDescription.new(GstWebRTC.WebRTCSDPType.OFFER, sm)
-                webrtcbin.emit('set-remote-description', rd, None)
-                sdp_offer = None
-            elif len(ice_candidates) > 0:
-                ic = ice_candidates.pop(0)
-                webrtcbin.emit('add-ice-candidate', ic['sdpMLineIndex'], ic['candidate'])
-            else:
-                await asyncio.sleep(0.1)
-    finally:
-        pipe.set_state(Gst.State.NULL)
-
-
-async def talk_to_websocket(uri):
-    global sdp_offer, ice_candidates
-    ssl_context = ssl.SSLContext()
-    ssl_context.check_hostname = False
-    ssl_context.verify_mode = ssl.CERT_NONE
-    async with websockets.connect(uri, ssl=ssl_context) as websocket:
-        async for msg in websocket:
-            msg_json = json.loads(msg)
-            msg_type = msg_json['Type']
-            msg_value = msg_json['Value']
-            session_id = msg_json['SessionID']
-            log.info(f"receive for session {session_id} type {msg_type}")
-            if msg_type == 'newSession':
-                pass
-            elif msg_type == 'gotOffer':
-                value_json = json.loads(msg_value)
-                sdp = value_json['sdp']
-                log.info(f'SDP: {sdp}')
-                sdp_offer = sdp
-            elif msg_type == 'addCallerIceCandidate':
-                value_json = json.loads(msg_value)
-                log.info(f'ICE: {value_json}')
-                ice_candidates.append(value_json)
-            else:
-                log.error(f'Unknown message type {msg_type}')
-
-
-async def run(uri):
-    talk_to_websocket_task = asyncio.Task(talk_to_websocket(uri))
-    listen_to_gstreamer_bus_task = asyncio.Task(listen_to_gstreamer_bus())
-    done, pending = await asyncio.wait(
-        [talk_to_websocket_task, listen_to_gstreamer_bus_task],
-        return_when=asyncio.FIRST_COMPLETED)
-    for d in done:
-        d.result()
-    for p in pending:
-        p.cancel()
+class Lagarde:
+    def __init__(self):
+        self.sdp_offer: Optional[str] = None
+        self.websocket: Optional[websockets.client.WebSocketClientProtocol] = None
+        self.session_id = None
+        self.received_ice_candidates = []
+        self.generated_ice_candidates = []
+        self.user_fragments: Optional[List] = None
+        self.mids: Optional[List] = None
+        self.pipe = None
+        self.webrtcbin = None
+
+    def on_negotiation_needed(self, element):
+        log.info('on_negotiation_needed')
+
+    def on_ice_candidate(self, element, mlineindex, candidate):
+        log.info('on_ice_candidate')
+        self.generated_ice_candidates.append((mlineindex, candidate))
+
+    def webrtcbin_pad_added(self, element, pad):
+        log.info('webrtcbin_pad_added')
+        if pad.direction != Gst.PadDirection.SRC:
+            return
+        decodebin = Gst.ElementFactory.make('decodebin')
+        decodebin.connect('pad-added', self.decodebin_pad_added)
+        self.pipe.add(decodebin)
+        decodebin.sync_state_with_parent()
+        self.webrtcbin.link(decodebin)
+
+    def decodebin_pad_added(self, element, pad):
+        log.info('decodebin_pad_added')
+        if not pad.has_current_caps():
+            log.info(pad, 'has no caps, ignoring')
+            return
+
+        caps = pad.get_current_caps()
+        assert (len(caps))
+        s = caps[0]
+        name = s.get_name()
+        if name.startswith('video'):
+            q = Gst.ElementFactory.make('queue')
+            conv = Gst.ElementFactory.make('videoconvert')
+            sink = Gst.ElementFactory.make('autovideosink')
+            self.pipe.add(q, conv, sink)
+            self.pipe.sync_children_states()
+            pad.link(q.get_static_pad('sink'))
+            q.link(conv)
+            conv.link(sink)
+        elif name.startswith('audio'):
+            q = Gst.ElementFactory.make('queue')
+            conv = Gst.ElementFactory.make('audioconvert')
+            resample = Gst.ElementFactory.make('audioresample')
+            sink = Gst.ElementFactory.make('autoaudiosink')
+            self.pipe.add(q, conv, resample, sink)
+            self.pipe.sync_children_states()
+            pad.link(q.get_static_pad('sink'))
+            q.link(conv)
+            conv.link(resample)
+            resample.link(sink)
+
+    async def listen_to_gstreamer_bus(self):
+        Gst.init(None)
+        self.webrtcbin = Gst.ElementFactory.make('webrtcbin', 'laplace')
+        self.pipe = Gst.Pipeline.new("pipeline")
+        Gst.Bin.do_add_element(self.pipe, self.webrtcbin)
+        bus = Gst.Pipeline.get_bus(self.pipe)
+        self.webrtcbin.connect('on-negotiation-needed', self.on_negotiation_needed)
+        self.webrtcbin.connect('on-ice-candidate', self.on_ice_candidate)
+        self.webrtcbin.connect('pad-added', self.webrtcbin_pad_added)
+        self.pipe.set_state(Gst.State.PLAYING)
+        try:
+            while True:
+                if bus.have_pending():
+                    msg = bus.pop()  # Gst.Message, has to be unref'ed.
+                    if msg.type != Gst.MessageType.STATE_CHANGED:
+                        # log.info(f'Receive Gst.Message: {msg.type}, {msg.seqnum}, {msg.get_structure()}')
+                        # log.info(f'{webrtcbin.props.signaling_state} {webrtcbin.props.ice_gathering_state} {webrtcbin.props.ice_connection_state}')
+                        # Gst.Message.unref(msg)
+                        pass
+                elif self.sdp_offer is not None:
+                    res, sm = GstSdp.SDPMessage.new()
+                    assert res == GstSdp.SDPResult.OK
+                    GstSdp.sdp_message_parse_buffer(bytes(self.sdp_offer.encode()), sm)
+                    # the three lines above can also be done this way in new versions of GStreamer:
+                    # sm = GstSdp.SDPMessage.new_from_text(sdp_offer)
+                    rd = GstWebRTC.WebRTCSessionDescription.new(GstWebRTC.WebRTCSDPType.OFFER, sm)
+                    gst_promise = Gst.Promise.new()
+                    self.webrtcbin.emit('set-remote-description', rd, gst_promise)
+                    gst_promise.wait()
+                    print(gst_promise.get_reply())
+                    self.sdp_offer = None
+
+                    log.info('create-answer')
+                    gst_promise = Gst.Promise.new()
+                    self.webrtcbin.emit('create-answer', None, gst_promise)
+                    result = gst_promise.wait()
+                    assert result == Gst.PromiseResult.REPLIED
+                    reply = gst_promise.get_reply()
+                    answer = reply.get_value('answer')
+                    sdp_message = answer.sdp
+                    self.user_fragments = [sdp_message.get_media(i).get_attribute_val('ice-ufrag')
+                                          for i in range(sdp_message.medias_len())]
+                    self.mids = [sdp_message.get_media(i).get_attribute_val('mid')
+                                          for i in range(sdp_message.medias_len())]
+                    sdp_answer = sdp_message.as_text()
+                    log.info(sdp_answer)
+                    sdp_answer_msg = json.dumps({
+                        'SessionID': self.session_id,
+                        'Type': "gotAnswer",
+                        'Value': json.dumps({
+                            'type': 'answer',
+                            'sdp': sdp_answer
+                        })
+                    })
+                    gst_promise = Gst.Promise.new()
+                    self.webrtcbin.emit('set-local-description', answer, gst_promise)
+                    gst_promise.wait()
+                    gst_promise.get_reply()
+                    await self.websocket.send(sdp_answer_msg)
+
+                elif len(self.received_ice_candidates) > 0:
+                    ic = self.received_ice_candidates.pop(0)
+                    if ic['candidate'] != '':
+                        self.webrtcbin.emit('add-ice-candidate', ic['sdpMLineIndex'], ic['candidate'])
+
+                elif len(self.generated_ice_candidates) > 0:
+                    mlineindex, candidate = self.generated_ice_candidates.pop(0)
+                    icemsg = json.dumps({
+                        'SessionID': self.session_id,
+                        'Type': 'addCalleeIceCandidate',
+                        'Value': json.dumps({
+                            "candidate": candidate,
+                            "sdpMid": self.mids[mlineindex],
+                            "sdpMLineIndex": mlineindex,
+                            "usernameFragment": self.user_fragments[mlineindex],
+                        })
+                    })
+                    log.info(f'send_ice_candidate_message with {icemsg}')
+                    await self.websocket.send(icemsg)
+
+                else:
+                    await asyncio.sleep(0.1)
+        finally:
+            self.pipe.set_state(Gst.State.NULL)
+
+    async def talk_to_websocket(self, uri):
+        ssl_context = ssl.SSLContext()
+        ssl_context.check_hostname = False
+        ssl_context.verify_mode = ssl.CERT_NONE
+        async with websockets.connect(uri, ssl=ssl_context) as self.websocket:
+            async for msg in self.websocket:
+                msg_json = json.loads(msg)
+                msg_type = msg_json['Type']
+                msg_value = msg_json['Value']
+                self.session_id = msg_json['SessionID']
+                log.info(f"receive for session {self.session_id} type {msg_type}")
+                if msg_type == 'newSession':
+                    pass
+                elif msg_type == 'gotOffer':
+                    value_json = json.loads(msg_value)
+                    sdp = value_json['sdp']
+                    log.info(f'SDP: {sdp}')
+                    self.sdp_offer = sdp
+                elif msg_type == 'addCallerIceCandidate':
+                    value_json = json.loads(msg_value)
+                    log.info(f'ICE: {value_json}')
+                    self.received_ice_candidates.append(value_json)
+                else:
+                    log.error(f'Unknown message type {msg_type}')
+
+    async def run(self, uri):
+        talk_to_websocket_task = asyncio.Task(self.talk_to_websocket(uri))
+        listen_to_gstreamer_bus_task = asyncio.Task(self.listen_to_gstreamer_bus())
+        done, pending = await asyncio.wait(
+            [talk_to_websocket_task, listen_to_gstreamer_bus_task],
+            return_when=asyncio.FIRST_COMPLETED)
+        for d in done:
+            d.result()
+        for p in pending:
+            p.cancel()
 
 
 def main():
     logging.basicConfig(level=logging.INFO, format='%(asctime)-15s %(message)s')
     parser = argparse.ArgumentParser()
     parser.add_argument('--uri', default='wss://localhost:1234/ws_connect?id=cug',
-        help='Signalling server URI')
+                        help='Signalling server URI')
     args = parser.parse_args()
-    asyncio.run(run(args.uri), debug=True)
+    lagarde = Lagarde()
+    asyncio.run(lagarde.run(args.uri), debug=True)
 
 
 if __name__ == '__main__':