Question

我正在使用Gstreamer RTSPMediaFactory（libgstrtspserver 1.0）v 1.2.3-0。从Python中，我派生出了MediaFactory，并覆盖了create_element。不幸的是，我的create_element永远不会被调用，因此RtspServer会抱怨no launch line specified。

我打印出超级实例中声明的所有方法，并得到了这个：

[＆＃39; set_buffer_size＆＃39;，＆＃39; set_suspend_mode＆＃39;，＆＃39; set_protocols＆＃39;，＆＃39; construct＆＃39;，＆＃39; get_suspend_mode＆＃39;，＆＃39; get_launch＆＃39;，＆＃39; set_launch＆＃39;，＆＃39; is_eos_shutdown＆＃39;，＆＃39; get_permissions＆＃39;，＆＃39; get_address_pool＆＃39;，＆＃39; set_shared＆＃39;，＆＃39; is_shared＆＃39;，＆＃39; set_address_pool＆＃39;，＆＃39; get_protocols＆＃39;，＆＃39; get_buffer_size＆＃39;，＆＃39; set_permissions＆＃39;，＆＃39; set_eos_shutdown＆＃39;]

否create_element！

难怪，我的实现从未被调用过......但为什么没有create_element函数？我该怎么办？

Answer 1

我使用版本1.4.3。

这是我的全部测试：

from gi.repository import Gst, GObject, GstRtspServer
Gst.init(None)
rtsp_server = GstRtspServer.RTSPServer()
rtsp_server.attach(None)


class Factory(GstRtspServer.RTSPMediaFactoryURI):

    def __init__(self):
        super(Factory, self).__init__()
        print [(x, type(y)) for x, y
               in GstRtspServer.RTSPMediaFactory.__dict__.items()]

    def do_create_element(self, url):
        print "in do_create_element"

factory = Factory()
factory.set_uri('rtsp://camera_url')
rtsp_server.get_mount_points().add_factory('/mount', factory)
GObject.MainLoop().run()

开始时打印输出：

[('set_buffer_size', <type 'function'>), ('do_media_configure', <class 'gi.types.NativeVFunc'>),
('__module__', <type 'str'>), ('do_configure', <class 'gi.types.NativeVFunc'>),
('set_suspend_mode', <type 'function'>), ('do_media_constructed', <class 'gi.types.NativeVFunc'>),
('__info__', <type 'ObjectInfo'>), ('do_create_element', <class 'gi.types.NativeVFunc'>),
('priv', <type 'property'>), ('set_protocols', <type 'function'>),
('construct', <type 'function'>), ('get_suspend_mode', <type 'function'>),
('_gst_reserved', <type 'property'>), ('new', <type 'classmethod'>),
('__gtype__', <type 'gobject.GType'>), ('get_launch', <type 'function'>),
('__doc__', <type 'NoneType'>), ('set_launch', <type 'function'>),
('do_construct', <class 'gi.types.NativeVFunc'>), ('parent', <type 'property'>),
('is_eos_shutdown', <type 'function'>), ('get_permissions', <type 'function'>),
('get_address_pool', <type 'function'>), ('do_gen_key', <class 'gi.types.NativeVFunc'>),
('set_shared', <type 'function'>), ('create_element', <type 'function'>),
('is_shared', <type 'function'>), ('set_address_pool', <type 'function'>),
('get_protocols', <type 'function'>), ('get_buffer_size', <type 'function'>),
('get_profiles', <type 'function'>), ('set_permissions', <type 'function'>),
('set_profiles', <type 'function'>), ('set_eos_shutdown', <type 'function'>)]

如您所见，它有create_element func，但您必须覆盖do_create_element，类型为gi.types.NativeVFunc的人。如果我将rtsp客户端连接到rtsp://127.0.0.1:8554/mount 打印输出：

in do_create_element

RTSPMediaFactory中没有的方法

1 个答案: