python/gst-custom-player.py

   1 #!/usr/bin/env python
   2
   3 # Simple media player with GStreamer
   4 #
   5 # Copyright (C) 2013  Antonio Ospite <ospite@studenti.unina.it>
   6 #
   7 # This program is free software: you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation, either version 3 of the License, or
  10 # (at your option) any later version.
  11 #
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19
  20 # References:
  21 # http://pygstdocs.berlios.de/pygst-reference
  22 # https://core.fluendo.com/gstreamer/svn/trunk/gst-fluendo-gdlsink/test/ismdplay.py
  23
  24 import sys
  25 import os
  26
  27 import gobject
  28 gobject.threads_init()
  29
  30 import gst
  31
  32 # The player window will have a fixed width and height.
  33 # This is just to demonstrate the use of capabilities.
  34 WIDTH = 640
  35 HEIGHT = 300
  36
  37
  38 class CustomVideoBin(gst.Bin):
  39     def __init__(self):
  40         gst.Bin.__init__(self, 'CustomVideoBin')
  41
  42         queue = gst.element_factory_make('queue', 'vqueue')
  43         self.add(queue)
  44
  45         rescale = gst.element_factory_make("videoscale", "rescale")
  46         self.add(rescale)
  47
  48         caps = gst.Caps("video/x-raw-yuv,format=(fourcc)AYUV,width=%d,height=%d,pixel-aspect-ratio=1/1" % (WIDTH, HEIGHT))
  49         capsfilter = gst.element_factory_make("capsfilter", "filter")
  50         capsfilter.set_property("caps", caps)
  51         self.add(capsfilter)
  52
  53         colorspace = gst.element_factory_make("colorspace", "colorspace")
  54         self.add(colorspace)
  55
  56         videosink = gst.element_factory_make("autovideosink", "vidoesink")
  57         self.add(videosink)
  58
  59         gst.element_link_many(queue, rescale, capsfilter, colorspace, videosink)
  60         sink = queue.get_pad('sink')
  61         self.add_pad(gst.GhostPad('sink', sink))
  62
  63
  64 class CustomAudioBin(gst.Bin):
  65     def __init__(self):
  66         gst.Bin.__init__(self, 'CustomAudioBin')
  67
  68         queue = gst.element_factory_make('queue', 'aqueue')
  69         self.add(queue)
  70
  71         audioconvert = gst.element_factory_make("audioconvert", "audioconverter")
  72         self.add(audioconvert)
  73
  74         audiosink = gst.element_factory_make("autoaudiosink", "audiosink")
  75         self.add(audiosink)
  76
  77         gst.element_link_many(queue, audioconvert, audiosink)
  78         sink = queue.get_pad('sink')
  79         self.add_pad(gst.GhostPad('sink', sink))
  80
  81
  82 class CustomPlayBin(gst.Pipeline):
  83     __gproperties__ = {
  84         'source': (gst.Element, "source", "Source element", gobject.PARAM_READABLE)
  85     }
  86
  87     def __init__(self, uri=None):
  88         gst.Pipeline.__init__(self, 'CustomPlayBin')
  89
  90         self._uri = uri
  91
  92         self._playbin = gst.element_factory_make("playbin2", "playbin")
  93         self.add(self._playbin)
  94
  95         self._playbin.set_property("uri", self._uri)
  96         self._playbin.set_property("video-sink", CustomVideoBin())
  97         self._playbin.set_property("audio-sink", CustomAudioBin())
  98
  99     def set_uri(self, uri):
 100         self._uri = uri
 101         self._playbin.set_property("uri", self._uri)
 102
 103
 104 class GstPlayer:
 105     def __init__(self):
 106
 107         # The user can require some action at End Of Stream
 108         self.eos_cb = None
 109
 110         self.pipeline = CustomPlayBin()
 111
 112         bus = self.pipeline.get_bus()
 113         bus.add_signal_watch()
 114         bus.connect('message::eos', self.on_eos)
 115         bus.connect('message::tag', self.on_tag)
 116         bus.connect('message::error', self.on_error)
 117         bus.connect('message::state-changed', self.on_state_changed)
 118
 119     def on_eos(self, bus, msg):
 120         print 'on_eos'
 121         self.stop()
 122         if self.eos_cb:
 123             self.eos_cb()
 124
 125     def on_tag(self, bus, msg):
 126         print 'on_tag:'
 127         taglist = msg.parse_tag()
 128         for key in taglist.keys():
 129             print '\t%s = %s' % (key, taglist[key])
 130
 131     def on_error(self, bus, msg):
 132         print 'on_error'
 133         error, debug = msg.parse_error()
 134         print "Error: %s" % error, debug
 135         self.stop()
 136
 137     def on_state_changed(self, bus, msg):
 138         print 'on_state_changed'
 139         if msg.src != self.pipeline:
 140             return
 141
 142         old_state, new_state, pending = msg.parse_state_changed()
 143
 144     def set_location(self, location):
 145         self.pipeline.set_uri(location)
 146
 147     def play(self):
 148         self.pipeline.set_state(gst.STATE_PLAYING)
 149
 150     def pause(self):
 151         self.pipeline.set_state(gst.STATE_PAUSED)
 152
 153     def stop(self):
 154         self.pipeline.set_state(gst.STATE_NULL)
 155
 156
 157 class PlayerTUI():
 158     def __init__(self, location):
 159
 160         self.player = GstPlayer()
 161         self.player.eos_cb = self.quit
 162
 163         self.mainloop = gobject.MainLoop()
 164
 165         self.player.set_location(location)
 166         self.player.play()
 167
 168         gobject.io_add_watch(sys.stdin, gobject.IO_IN, self.on_stdin)
 169
 170         try:
 171             self.mainloop.run()
 172         except KeyboardInterrupt:
 173             self.quit()
 174
 175     def on_stdin(self, fd, event):
 176         # The user has to send a newline fo this to go on
 177         c = os.read(fd.fileno(), 1)
 178
 179         if c == "q":
 180             self.quit()
 181         elif c == "s":
 182             self.player.pause()
 183         elif c == "r":
 184             self.player.play()
 185
 186         return True
 187
 188     def quit(self):
 189         self.player.stop()
 190         self.player = None
 191         self.mainloop.quit()
 192
 193
 194 def main(args):
 195     def usage():
 196         sys.stdout.write("usage: %s <URI-OF-MEDIA-FILE>\n" % args[0])
 197
 198     if len(args) != 2:
 199         usage()
 200         sys.exit(1)
 201
 202     if not gst.uri_is_valid(args[1]):
 203         sys.stderr.write("Error: Invalid URI: %s\n" % args[1])
 204         sys.exit(1)
 205
 206     tui = PlayerTUI(args[1])
 207
 208 if __name__ == '__main__':
 209     sys.exit(main(sys.argv))