v4l example in progress

Original commit message from CVS:
v4l example in progress

diff --git a/examples/gst/v4l.py b/examples/gst/v4l.py
new file mode 100755 (executable)
index 0000000..cc89262
--- /dev/null
+++ b/examples/gst/v4l.py
@@ -0,0 +1,116 @@
+#!/usr/bin/env python
+#
+# -*- Mode: Python -*-
+# vi:si:et:sw=4:sts=4:ts=4
+#
+# gst-python
+# Copyright (C) 2002 David I. Lehn <dlehn@users.sourceforge.net>
+#               2004 Johan Dahlin  <johan@gnome.org>
+#               2004 Thomas Vander Stichele <thomas at apestaart dot org>
+#
+# 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.
+
+from gst import *
+import gst.interface
+
+def gst_props_debug_entry(entry, level=0):
+    name = entry.get_name()
+    type = entry.get_props_type()
+    indent = ' '*level
+
+    if type == PROPS_INT_TYPE:
+        ret, val = entry.get_int()
+        assert ret
+        print '%s%s: int %d' % (indent, name, val)
+    elif type == PROPS_FLOAT_TYPE:
+        ret, val = entry.get_float()
+        assert ret
+        print '%s%s: float %f' % (indent, name, val)
+    elif type == PROPS_FOURCC_TYPE:
+        ret, val = entry.get_fourcc()
+        assert ret
+        print '%s%s: fourcc %c%c%c%c' % (indent, name,
+                    (val>>0)&0xff,
+                    (val>>8)&0xff,
+                    (val>>16)&0xff,
+                    (val>>24)&0xff)
+    elif type == PROPS_BOOLEAN_TYPE:
+        ret, val = entry.get_bool()
+        assert ret
+        print '%s%s: bool %d' % (indent, name, val)
+    elif type == PROPS_STRING_TYPE:
+        ret, val = entry.get_string()
+        assert ret
+        print '%s%s: string "%s"' % (indent, name, val)
+    elif type == PROPS_INT_RANGE_TYPE:
+        ret, min, max = entry.get_int_range()
+        assert ret
+        print '%s%s: int range %d-%d' % (indent, name, min, max)
+    elif type == PROPS_FLOAT_RANGE_TYPE:
+        ret, min, max = entry.get_float_range()
+        assert ret
+        print '%s%s: float range %f-%f' % (indent, name, min, max)
+    elif type == PROPS_LIST_TYPE:
+        ret, val = entry.get_list()
+        assert ret
+        print '[list] ('
+        for e in val:
+            gst_props_debug_entry(e, level+1)
+        print ')'
+    else:
+        print '%sWARNING: %s: unknown property type %d' % (indent, name, type)
+
+def debug_caps(caps):
+    props = caps.get_props()
+    ret, plist = props.get_list()
+    for e in plist:
+        gst_props_debug_entry(e, level=1)
+
+def main():
+    "example for v4l element"
+
+    # create a new bin to hold the elements
+    bin = Pipeline('pipeline')
+
+    # create a v4l reader
+    src = Element('v4lsrc', 'src')
+
+    # colorspace
+    csp = Element('ffmpegcolorspace', 'csp')
+
+    # displayer
+    sink = Element('ximagesink', 'sink')
+
+    #  add and link
+    bin.add_many(src, csp, sink)
+    src.link(csp)
+    csp.link(sink)
+
+    # start playing
+    bin.set_state(STATE_PLAYING);
+    dir(src)
+    src.get_channel()
+
+    while bin.iterate(): pass
+
+    # stop the bin
+    bin.set_state(STATE_NULL)
+
+    return 0
+
+if __name__ == '__main__':
+    ret = main()
+    sys.exit(ret)