gstreamer/examples/pipeline-tester

156 lines
4.6 KiB
Text
Raw Normal View History

#!/usr/bin/env python
#
# gst-python
# Copyright (C) 2005 Andy Wingo <wingo@pobox.com>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Library General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Library General Public License for more details.
#
# You should have received a copy of the GNU Library General Public
# License along with this library; if not, write to the
# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.
# A test more of gst-plugins than of gst-python.
import sys
import pygtk
pygtk.require('2.0')
import gtk
import gtk.gdk
import pango
import pygst
pygst.require('0.9')
import gst
data = (('Video capture via V4L',
'v4lsrc name=source \n'
' ! video/x-raw-yuv,format=(fourcc)I420 \n'
' ! videorate \n'
' ! xvimagesink'),
('Sound capture via ALSA',
'alsasrc\n'
' ! audio/x-raw-int,rate=22050,depth=16,channels=1,width=16,signed=(boolean)TRUE,endianness=1234\n'
' ! level signal=true\n'
' ! alsasink'))
def escape(s, chars, escaper='\\'):
for c in chars:
s = s.replace(c, '%s%s' % (escaper, c))
return s
def make_model():
m = gtk.ListStore(str, str)
for pair in data:
i = m.append()
m.set_value(i, 0, pair[0])
m.set_value(i, 1, pair[1])
return m
class Window(gtk.Window):
def __init__(self):
gtk.Window.__init__(self, gtk.WINDOW_TOPLEVEL)
self.playing = False
self.selected_pipe = None
self.pipeline = None
self.prepare_ui()
def prepare_ui(self):
self.set_default_size(300,400)
self.set_title('GStreamer Pipeline Tester')
self.set_type_hint(gtk.gdk.WINDOW_TYPE_HINT_DIALOG)
self.connect('delete-event', lambda *x: gtk.main_quit())
self.set_border_width(18)
b = gtk.VBox(False, 12)
b.show()
self.add(b)
l = gtk.Label()
l.set_markup('<big><b>GStreamer Pipeline Tester</b></big>')
l.show()
b.pack_start(l, False, False, 6)
l = gtk.Label('Choose a pipeline below to run.')
l.show()
b.pack_start(l, False, False, 0)
sw = gtk.ScrolledWindow()
sw.set_policy(gtk.POLICY_NEVER, gtk.POLICY_NEVER)
sw.set_shadow_type(gtk.SHADOW_IN)
sw.show()
b.pack_start(sw, True, True, 6)
tv = gtk.TreeView(make_model())
r = gtk.CellRendererText()
r.set_property('xalign', 0.5)
c = gtk.TreeViewColumn('System', r, text=0)
tv.append_column(c)
tv.set_headers_visible(False)
tv.show()
sw.add(tv)
l = gtk.Label()
l.set_selectable(True)
l.show()
b.pack_start(l, False, False, 0)
bb = gtk.HButtonBox()
bb.set_layout(gtk.BUTTONBOX_SPREAD)
bb.show()
b.pack_start(bb, False, False, 0)
bu = gtk.Button(stock=gtk.STOCK_MEDIA_PLAY)
bu.set_focus_on_click(False)
bu.show()
bb.pack_start(bu, True, False, 0)
def on_changed(s):
m, i = s.get_selected()
if m:
self.selected_pipe = m.get_value(i, 1)
pasteable = escape(self.selected_pipe, '\n)(')
l.set_markup('<small><tt>%s</tt></small>' % pasteable)
else:
self.selected_pipe = None
l.set_markup('')
tv.get_selection().connect('changed', on_changed)
bu.connect('clicked', self.play_toggled)
def play(self):
pipestr = self.selected_pipe
pipeline = gst.parse_launch(pipestr)
if pipeline.set_state(gst.STATE_PLAYING) != gst.STATE_SUCCESS:
print 'state change failed'
return False
else:
self.pipeline = pipeline
return True
def stop(self):
self.pipeline.set_state(gst.STATE_NULL)
self.pipeline = None
def play_toggled(self, button):
if self.playing:
self.stop()
button.set_label(gtk.STOCK_MEDIA_PLAY)
self.playing = False
else:
if self.play():
self.playing = True
button.set_label(gtk.STOCK_MEDIA_STOP)
if __name__ == '__main__':
w = Window()
w.show()
gtk.main()