Implementing a Video-Switching-Server is easy … if you know what your're doing

1 files changed, 92 insertions, 0 deletions

diff --git a/voctocore/lib/videosrc.py b/voctocore/lib/videosrc.py
new file mode 100644
index 0000000..10b63fb
--- /dev/null
+++ b/voctocore/lib/videosrc.py
@@ -0,0 +1,92 @@
+#!/usr/bin/python3
+import logging, socket
+from gi.repository import GObject, Gst
+
+from lib.config import Config
+
+class VideoSrc(object):
+	log = logging.getLogger('VideoSrc')
+
+	name = None
+	port = None
+	caps = None
+
+	distributionPipeline = None
+	receiverPipeline = None
+
+	boundSocket = None
+	currentConnection = None
+
+	def __init__(self, name, port, caps):
+		self.log = logging.getLogger('VideoSrc['+name+']')
+
+		self.name = name
+		self.port = port
+		self.caps = caps
+
+		pipeline = """
+			intervideosrc channel={name}_in !
+			{caps} !
+			timeoverlay halignment=left valignment=top !
+			textoverlay text={name}_in halignment=left valignment=top ypad=75 !
+			queue !
+			tee name=tee
+
+			tee. ! queue ! intervideosink channel={name}_mirror
+			tee. ! queue ! intervideosink channel={name}_preview
+			tee. ! queue ! intervideosink channel={name}_mixer
+		""".format(
+			name=self.name,
+			caps=self.caps
+		)
+
+		self.log.debug('Launching Source-Distribution-Pipeline:\n%s', pipeline)
+		self.distributionPipeline = Gst.parse_launch(pipeline)
+		self.distributionPipeline.set_state(Gst.State.PLAYING)
+
+		self.log.debug('Binding to Source-Socket on [::]:%u', port)
+		self.boundSocket = socket.socket(socket.AF_INET6)
+		self.boundSocket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+		self.boundSocket.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_V6ONLY, False)
+		self.boundSocket.bind(('::', port))
+		self.boundSocket.listen(1)
+
+		self.log.debug('Setting GObject io-watch on Socket')
+		GObject.io_add_watch(self.boundSocket, GObject.IO_IN, self.on_connect)
+
+	def on_connect(self, sock, *args):
+		conn, addr = sock.accept()
+		self.log.info("incomming connection from %s", addr)
+
+		if self.currentConnection is not None:
+			self.log.warn("another source is already connected")
+			return True
+
+		pipeline = """
+			fdsrc fd={fd} !
+			gdpdepay !
+			{caps} !
+			intervideosink channel={name}_in
+		""".format(
+			fd=conn.fileno(),
+			name=self.name,
+			caps=self.caps
+		)
+		self.log.debug('Launching Source-Receiver-Pipeline:\n%s', pipeline)
+		self.receiverPipeline = Gst.parse_launch(pipeline)
+
+		self.log.debug('Binding End-of-Stream-Signal on Source-Receiver-Pipeline')
+		self.receiverPipeline.bus.add_signal_watch()
+		self.receiverPipeline.bus.connect("message::eos", self.on_disconnect)
+
+		self.receiverPipeline.set_state(Gst.State.PLAYING)
+
+		self.currentConnection = conn
+		return True
+
+	def on_disconnect(self, bus, message):
+		self.log.info('Received End-of-Stream-Signal on Source-Receiver-Pipeline')
+		self.receiverPipeline.set_state(Gst.State.NULL)
+		self.receiverPipeline = None
+
+		self.currentConnection = None