From 95cefc34d05a36c523ae74d340b95d67a930e856 Mon Sep 17 00:00:00 2001
From: MaZderMind <github@mazdermind.de>
Date: Mon, 11 Aug 2014 21:53:25 +0200
Subject: implement grabbersrc via shm

---
 voctocore/experiments/failovertest.py     | 83 +++++++++++--------------------
 voctocore/experiments/shmsrc.py           | 27 ++++++++++
 voctocore/experiments/test-grabber-src.sh | 10 ++++
 voctocore/experiments/videodisplay.py     | 53 ++++++++++++++++++++
 4 files changed, 120 insertions(+), 53 deletions(-)
 create mode 100644 voctocore/experiments/shmsrc.py
 create mode 100755 voctocore/experiments/test-grabber-src.sh
 create mode 100644 voctocore/experiments/videodisplay.py

(limited to 'voctocore/experiments')

diff --git a/voctocore/experiments/failovertest.py b/voctocore/experiments/failovertest.py
index 5ebaa9a..ee9198b 100755
--- a/voctocore/experiments/failovertest.py
+++ b/voctocore/experiments/failovertest.py
@@ -1,10 +1,5 @@
 #!/usr/bin/python3
 import gi
-import time
-import signal
-from http.client import HTTPConnection
-from termcolor import colored
-from threading import Timer, Thread
 
 # import GStreamer and GTK-Helper classes
 gi.require_version('Gst', '1.0')
@@ -13,62 +8,44 @@ from gi.repository import GLib, Gst, Gtk, GObject
 # init GObject before importing local classes
 GObject.threads_init()
 Gst.init(None)
-loop = GLib.MainLoop()
 
-# make killable by ctrl-c
-signal.signal(signal.SIGINT, signal.SIG_DFL)
+from videodisplay import VideomixerWithDisplay
+from shmsrc import ShmSrc
 
-# parse_launch
-p = Gst.parse_launch("""
-	input-selector name=failover ! autovideosink
+class Example:
+	def __init__(self):
+		self.mainloop = GObject.MainLoop()
+		self.pipeline = Gst.Pipeline()
 
-	appsrc name=src blocksize=4096 is-live=true block=true ! multipartdemux name=demux ! jpegparse ! jpegdec ! videoconvert ! failover.sink_1
-	videotestsrc ! video/x-raw,width=500,height=375 ! failover.sink_0
-""")
+		self.bus = self.pipeline.get_bus()
+		self.bus.add_signal_watch()
+		self.bus.connect('message::eos', self.on_eos)
+		self.bus.connect('message::error', self.on_error)
 
-def failsafeVideoSource():
-	src = p.get_by_name('src')
-	dec = p.get_by_name('dec')
-	demux = p.get_by_name('demux')
-	failover = p.get_by_name('failover')
-	srcActive = True
+		self.mixdisplay = VideomixerWithDisplay()
+		self.grabbersrc = ShmSrc('/tmp/grabber', Gst.Caps.from_string('video/x-raw,width=1280,height=720,framerate=25/1,format=BGRA'))
 
-	while True:
-		print('connecting to framegrabber')
-		try:
-			con = HTTPConnection('beachcam.kdhnc.com', 80, timeout=3)
-			req = con.request('GET', '/mjpg/video.mjpg?camera=1')
-			res = con.getresponse()
-			srcActive = True
+		# Add elements to pipeline
+		self.pipeline.add(self.mixdisplay)
+		self.pipeline.add(self.grabbersrc)
 
-			print('connected, switching to video')
-			failover.set_property('active-pad', failover.get_static_pad('sink_1'))
+		self.grabbersrc.link(self.mixdisplay)
 
-			while srcActive:
-				chunk = res.read(4094)
-				chunklen = len(chunk)
-				print('read ', len(chunk), ' of ', 4096, ', closed=', res.isclosed())
-				
-				if chunklen > 0:
-					src.emit('push-buffer', Gst.Buffer.new_wrapped(chunk))
-				else:
-					srcActive = False
-		except:
-			print('exception')
-			srcActive = False
+	def run(self):
+		self.pipeline.set_state(Gst.State.PLAYING)
+		self.mainloop.run()
 
-		print('switching to failsave')
-		failover.set_property('active-pad', failover.get_static_pad('sink_0'))
+	def kill(self):
+		self.pipeline.set_state(Gst.State.NULL)
+		self.mainloop.quit()
 
-		print('sleeping before retry')
-		time.sleep(1)
+	def on_eos(self, bus, msg):
+		print('on_eos()')
+		#self.kill()
 
-fsThread = Thread(target=failsafeVideoSource)
-fsThread.deamon = True
-fsThread.start()
+	def on_error(self, bus, msg):
+		print('on_error():', msg.parse_error())
+		#self.kill()
 
-# set playing
-p.set_state(Gst.State.PLAYING)
-
-# start mainloop
-loop.run()
+example = Example()
+example.run()
diff --git a/voctocore/experiments/shmsrc.py b/voctocore/experiments/shmsrc.py
new file mode 100644
index 0000000..e9dd23a
--- /dev/null
+++ b/voctocore/experiments/shmsrc.py
@@ -0,0 +1,27 @@
+#!/usr/bin/python3
+from gi.repository import GObject, Gst
+
+class ShmSrc(Gst.Bin):
+	def __init__(self, socket, caps):
+		super().__init__()
+
+		# Create elements
+		self.shmsrc = Gst.ElementFactory.make('shmsrc', None)
+		self.caps = Gst.ElementFactory.make('capsfilter', None)
+
+		# Add elements to Bin
+		self.add(self.shmsrc)
+		self.add(self.caps)
+
+		# Set properties
+		self.shmsrc.set_property('socket-path', socket)
+		self.shmsrc.set_property('is-live', True)
+		self.shmsrc.set_property('do-timestamp', True)
+
+		self.caps.set_property('caps', caps)
+		self.shmsrc.link(self.caps)
+
+		# Add Ghost Pads
+		self.add_pad(
+			Gst.GhostPad.new('sink', self.caps.get_static_pad('src'))
+		)
diff --git a/voctocore/experiments/test-grabber-src.sh b/voctocore/experiments/test-grabber-src.sh
new file mode 100755
index 0000000..e298faf
--- /dev/null
+++ b/voctocore/experiments/test-grabber-src.sh
@@ -0,0 +1,10 @@
+#!/bin/sh
+gst-launch-1.0 -vm \
+	videotestsrc !\
+	video/x-raw,width=1280,height=720,framerate=25/1,format=BGRA !\
+	queue !\
+	shmsink \
+		sync=true \
+		socket-path=/tmp/grabber \
+		wait-for-connection=false \
+		shm-size=100000000
diff --git a/voctocore/experiments/videodisplay.py b/voctocore/experiments/videodisplay.py
new file mode 100644
index 0000000..57087da
--- /dev/null
+++ b/voctocore/experiments/videodisplay.py
@@ -0,0 +1,53 @@
+#!/usr/bin/python3
+from gi.repository import GObject, Gst
+
+class VideomixerWithDisplay(Gst.Bin):
+	def __init__(self):
+		super().__init__()
+
+		# Create elements
+		self.secondsrc = Gst.ElementFactory.make('videotestsrc', None)
+		self.mixer = Gst.ElementFactory.make('videomixer', None)
+		self.ident = Gst.ElementFactory.make('identity', None)
+		self.conv = Gst.ElementFactory.make('videoconvert', None)
+		self.q1 = Gst.ElementFactory.make('queue', None)
+		self.q2 = Gst.ElementFactory.make('queue', None)
+		self.display = Gst.ElementFactory.make('ximagesink', None)
+
+		# Add elements to Bin
+		self.add(self.secondsrc)
+		self.add(self.mixer)
+		self.add(self.ident)
+		self.add(self.conv)
+		self.add(self.display)
+		self.add(self.q1)
+		self.add(self.q2)
+
+		# Set properties
+		self.secondsrc.set_property('pattern', 'ball')
+		self.ident.set_property('sync', True)
+		self.display.set_property('sync', False)
+
+		# Request Pads
+		self.firstpad = self.mixer.get_request_pad('sink_%u')
+		self.secondpad = self.mixer.get_request_pad('sink_%u')
+
+		# Set pad-properties
+		self.secondpad.set_property('alpha', 0.75)
+		self.secondpad.set_property('xpos', 50)
+		self.secondpad.set_property('ypos', 50)
+
+		# Link elements
+		self.q1.get_static_pad('src').link(self.firstpad)
+
+		self.q2.get_static_pad('src').link(self.secondpad)
+		self.secondsrc.link_filtered(self.ident, Gst.Caps.from_string('video/x-raw,format=BGRA,width=400,height=400,framerate=25/1'))
+		self.ident.link(self.q2)
+
+		self.mixer.link(self.conv)
+		self.conv.link(self.display)
+
+		# Add Ghost Pads
+		self.add_pad(
+			Gst.GhostPad.new('sink', self.q1.get_static_pad('sink'))
+		)
-- 
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