git.slaskete.net - python-gstreamer-examples/blob - example5.py

   1 #!/usr/bin/env python
   2 # Attempting to dynamically switch between input sources
   3
   4 # GdkX11 to get access to xid, GstVideo to get access to set_window_handle
   5 import gi, signal, time
   6 gi.require_version('Gtk', '3.0')
   7 gi.require_version('Gst', '1.0')
   8 gi.require_version('GstVideo', '1.0')
   9 from gi.repository import Gtk, Gst, GdkX11, GstVideo
  10
  11 stream1="http://192.168.0.90/video/mjpg.cgi"
  12
  13 class Main:
  14     def __init__(self):
  15
  16         # Create gui bits and bobs
  17
  18         self.mainwindow = Gtk.Builder()
  19         self.mainwindow.add_from_file("example5.glade")
  20
  21         signals = {
  22             "on_input1_clicked" : self.SetInput1,
  23             "on_input2_clicked" : self.SetInput2,
  24             "on_input3_clicked" : self.SetInput3,
  25             "on_input4_clicked" : self.SetInput4,
  26             "on_input5_clicked" : self.SetInput5,
  27             "on_input6_clicked" : self.SetInput6,
  28             "on_quit_clicked" : self.OnQuit,
  29         }
  30
  31         self.mainwindow.connect_signals(signals)
  32
  33         # Create GStreamer bits and bobs
  34
  35         # Initiate Gstreamer
  36         Gst.init(None)
  37
  38         # Some capabilities we want to share between different elements
  39         jpegcaps = Gst.Caps.from_string("image/jpeg,width=1280,height=720,framerate=30/1")
  40         xrawcaps = Gst.Caps.from_string("video/x-raw,width=1280,height=720,framerate=30/1")
  41
  42         # Set up the pipeline
  43         self.pipeline = Gst.Pipeline()
  44
  45         # Add elements
  46
  47         # src1
  48         self.src1 = Gst.ElementFactory.make("v4l2src", "src1")
  49         self.src1.set_property("device", "/dev/video0")
  50         self.src1caps = Gst.ElementFactory.make("capsfilter", "src1caps")
  51         self.src1caps.set_property("caps", jpegcaps)
  52         self.src1dec = Gst.ElementFactory.make("decodebin", "src1dec")
  53
  54         # src2
  55         self.src2 = Gst.ElementFactory.make("v4l2src", "src2")
  56         self.src2.set_property("device", "/dev/video1")
  57         self.src2caps = Gst.ElementFactory.make("capsfilter", "src2caps")
  58         self.src2caps.set_property("caps", jpegcaps)
  59         self.src2dec = Gst.ElementFactory.make("decodebin", "src2dec")
  60
  61         # src3
  62         self.src3 = Gst.ElementFactory.make("videotestsrc", "src3")
  63         self.src3caps = Gst.ElementFactory.make("capsfilter", "src3caps")
  64         self.src3caps.set_property("caps", xrawcaps)
  65         self.src3dec = Gst.ElementFactory.make("decodebin", "src3dec")
  66
  67         # Video mix
  68         self.videomix = Gst.ElementFactory.make("videomixer", "videomix")
  69         self.src1pad = self.videomix.get_request_pad("sink_1")
  70         self.src1pad.set_property("zorder", 3)
  71         self.src2pad = self.videomix.get_request_pad("sink_2")
  72         self.src2pad.set_property("zorder", 2)
  73         self.src3pad = self.videomix.get_request_pad("sink_3")
  74         self.src3pad.set_property("zorder", 1)
  75
  76         # Add main videosink
  77         self.videosink = Gst.ElementFactory.make("xvimagesink", "videosink")
  78         self.videosink.set_property("sync", False)
  79
  80         # Add initial elements to the pipeline
  81         self.pipeline.add(self.src1)
  82         self.pipeline.add(self.src1caps)
  83         self.pipeline.add(self.src1dec)
  84         self.src1dec.connect("pad-added", self.OnPadAdded, self.src1pad)
  85
  86         self.pipeline.add(self.src2)
  87         self.pipeline.add(self.src2caps)
  88         self.pipeline.add(self.src2dec)
  89         self.src2dec.connect("pad-added", self.OnPadAdded, self.src2pad)
  90
  91         self.pipeline.add(self.src3)
  92         self.pipeline.add(self.src3caps)
  93         self.pipeline.add(self.src3dec)
  94         self.src3dec.connect("pad-added", self.OnPadAdded, self.src3pad)
  95
  96         self.pipeline.add(self.videomix)
  97         self.pipeline.add(self.videosink)
  98
  99         # Link the initial pipeline
 100         if not self.src1.link(self.src1caps):
 101             print("Failed to link src1 to src1caps")
 102         if not self.src1caps.link(self.src1dec):
 103             print("Failed to link src1caps to src1dec")
 104         if not self.videomix.link(self.videosink):
 105             print("Failed to link videomix to videosink")
 106
 107         if not self.src2.link(self.src2caps):
 108             print("Failed to link src2 to src2caps")
 109         if not self.src2caps.link(self.src2dec):
 110             print("Failed to link src2caps to src2dec")
 111
 112         if not self.src3.link(self.src3caps):
 113             print("Failed to link src3 to src3caps")
 114         if not self.src3caps.link(self.src3dec):
 115             print("Failed to link src3caps to src3dec")
 116
 117         # Set up a bus to our pipeline to get notified when the video is ready
 118         self.bus = self.pipeline.get_bus()
 119         self.bus.enable_sync_message_emission()
 120         self.bus.connect("sync-message::element", self.OnSyncElement)
 121
 122         # Summon the window and connect the window's close button to quit
 123         self.window = self.mainwindow.get_object("mainwindow")
 124         self.window.connect("delete-event", Gtk.main_quit)
 125         self.window.show_all()
 126
 127         # Get window ID of the viewport widget from the GUI
 128         self.win_id = self.mainwindow.get_object("viewport_main").get_window().get_xid()
 129
 130         # Play!
 131         print(self.pipeline.set_state(Gst.State.READY))
 132         print(self.pipeline.set_state(Gst.State.PLAYING))
 133         self.pipeline.get_state
 134
 135
 136     # When we get a message that video is ready to display, set the
 137     # correct window id to hook it to our viewport
 138     def OnSyncElement(self, bus, message):
 139         if message.get_structure().get_name() == "prepare-window-handle":
 140             print("prepare-window-handle")
 141             message.src.set_window_handle(self.win_id)
 142
 143     def OnPadAdded(self, element, pad, sink):
 144         print("Dynamic pad added")
 145         print(pad.link(sink))
 146         print(element.link(self.videomix))
 147
 148     def SetInput1(self, widget):
 149         print("Switch to input 1")
 150         self.src1pad.set_property("zorder", 3)
 151         self.src2pad.set_property("zorder", 2)
 152         self.src3pad.set_property("zorder", 1)
 153
 154     def SetInput2(self, widget):
 155         print("Switch to input 2")
 156         self.src1pad.set_property("zorder", 2)
 157         self.src2pad.set_property("zorder", 3)
 158         self.src3pad.set_property("zorder", 1)
 159
 160     def SetInput3(self, widget):
 161         print("Switch to input 3")
 162         self.src1pad.set_property("zorder", 1)
 163         self.src2pad.set_property("zorder", 2)
 164         self.src3pad.set_property("zorder", 3)
 165
 166     def SetInput4(self, widget):
 167         print("Switch to input 4")
 168
 169     def SetInput5(self, widget):
 170         print("Switch to input 5")
 171
 172     def SetInput6(self, widget):
 173         print("Switch to input 6")
 174
 175     def OnQuit(self, widget):
 176         print("quit")
 177         Gtk.main_quit()
 178
 179     # Workaround to get Ctrl+C to terminate from command line
 180     # ref: https://bugzilla.gnome.org/show_bug.cgi?id=622084#c12
 181     signal.signal(signal.SIGINT, signal.SIG_DFL)
 182
 183 start = Main()
 184 Gtk.main()