resume playback (one client only)

README.md

@@ -38,6 +38,10 @@ Sender (Pi): gst-launch-1.0 -e v4l2src do-timestamp=true ! video/x-h264,width=64
 
 Receiver: gst-launch-1.0 -v udpsrc port=5000 ! gdpdepay ! rtph264depay ! avdec_h264 ! fpsdisplaysink sync=false text-overlay=false
 
+## debugging
+
+export GST_DEBUG=*webrtc*:7
+
 ## documentation
 
 https://flask-socketio.readthedocs.io/en/latest/

raspberry/roberto/camera/camera_gstreamer_webrtc.py

@@ -2,6 +2,7 @@ import os
 import sys
 
 from threading import Thread
+from queue import Queue
 
 import socketio
 
@@ -25,13 +26,30 @@ webrtcbin name=sendrecv bundle-policy=max-bundle stun-server=stun://stun.l.googl
  queue ! application/x-rtp,media=audio,encoding-name=OPUS,payload=96 ! sendrecv.
 '''
 
+#PIPELINE_DESC = '''
+#webrtcbin name=webrtcbin stun-server=stun://stun://stun.l.google.com:19302
+#rpicamsrc bitrate=600000 annotation-mode=12 preview=false ! video/x-h264,profile=constrained-baseline,width=640,height=360,level=3.0 ! queue max-size-time=100000000 ! h264parse !
+#rtph264pay config-interval=-1 name=payloader !
+#application/x-rtp,media=video,encoding-name=H264,payload=96 ! sendrecv.
+#'''
+
+#PIPELINE_DESC = '''
+#v4l2src ! queue ! vp8enc ! rtpvp8pay !
+#    application/x-rtp,media=video,encoding-name=VP8,payload=96 ! 
+#    webrtcbin name=sendrecv
+#'''
+
+
 class WebRTCCamera(Thread):
     def __init__(self):
         self.pipe = None
         self.webrtc = None
-        self.server = 'ws://localhost:5000'
+        self.sid = None
+        self.current_client_sid = None
+        self.num_clients = 0
         self.connected = False
-        self.exitFlag = False
+        self.server = 'ws://localhost:5000'
+        self._queue = Queue(maxsize=10)
 
         Thread.__init__(self)
 
@@ -40,30 +58,52 @@ class WebRTCCamera(Thread):
             sys.exit(1)
 
     def run(self):
+        print("Starting WebRTCCamera background thread")
         self.connect()
-        while not self.exitFlag:
-            sio.sleep(1)
+
+        while True:
+            item = self._queue.get()
+            if item['job'] == "connect_client":
+                self.current_client_sid = item['sid']
+                self.start_pipeline(item['sid'])
+                self.num_clients += 1
+            elif item['job'] == "disconnect_client":
+                self.current_client_sid = item['sid']
+                self.close_pipeline(item['sid'])
+                self.num_clients -= 1
+            else:
+                print("unknown job: %s" % item['job'])
+            self._queue.task_done()
+
+        self.disconnect()
+
 
     def connect(self):
         sio.connect(self.server, namespaces=['/webrtc'], transports=['websocket'])
         print('my sid is', sio.sid)
-        sio.emit('message', 'starting camera', namespace='/webrtc')
-        self.start_pipeline()
+        self.sid = sio.sid
         self.connected = True
 
     def disconnect(self):
         self.connected = False
-        self.close_pipeline()
         sio.disconnect()
 
-    def start_pipeline(self):  # ok
+    def connect_client(self, sid):
+        if not self.is_alive():
+            self.start()
+        self._queue.put({'job':'connect_client', 'sid':sid})
+
+    def disconnect_client(self, sid):
+        self._queue.put({'job':'disconnect_client', 'sid':sid})
+
+    def start_pipeline(self, client_sid):  # ok
         self.pipe = Gst.parse_launch(PIPELINE_DESC)
         self.webrtc = self.pipe.get_by_name('sendrecv')
         self.webrtc.connect('on-negotiation-needed', self.on_negotiation_needed)
         self.webrtc.connect('on-ice-candidate', self.on_ice_candidate)
         self.pipe.set_state(Gst.State.PLAYING)
 
-    def close_pipeline(self):
+    def close_pipeline(self, client_sid):
         self.pipe.set_state(Gst.State.NULL)
         self.pipe = None
         self.webrtc = None

raspberry/roberto/views/websocket/routes.py

@@ -74,18 +74,19 @@ def webrtc_message(data):
 def disconnect():
     sid = request.sid
     print("Received Disconnect message from %s" % sid)
-    if webrtccamera.connected:
-        webrtccamera.disconnect()
+    webrtccamera.disconnect_client(sid)
 
 @socketio.on('connect', namespace='/webrtc')
 def connect():
     sid = request.sid
     print("Received Connect message from %s" % sid)
-    if not webrtccamera.connected:
-        webrtccamera.start()
-    socketio.emit('message', 'test2', namespace='/webrtc')
+    webrtccamera.connect_client(sid)
 
 @socketio.on_error_default
 def default_error_handler(e):
     print(request.event["message"]) # "my error event"
     print(request.event["args"])    # (data,)
+    keys = request.keys()
+    keys.sort()
+    for key in request:
+        print('%s: %s' % (key, repr(request[key])))

raspberry/roberto/views/websocket/templates/camera.html

@@ -10,7 +10,7 @@
     <script src="{{ url_for('static', filename='js/jquery.min.js') }}"></script>
     <script src="{{ url_for('static', filename='js/bootstrap.min.js') }}"></script>
     <script src="{{ url_for('static', filename='js/socket.io.js') }}"></script>
-    <script type="text/javascript" src="https://webrtc.github.io/adapter/adapter-latest.js"></script><!-- DEBUG REMOVE ME //-->
+    <!--<script type="text/javascript" src="https://webrtc.github.io/adapter/adapter-latest.js"></script>-->
   </head>
 
   <body>