gst_init exceptions when it is used in a dynamic lib which is loaded by dlopen

[Halley Zhao]

我把gst_init/gst_deinit移到了动态库的外部，也就是进程仅做一次gst_init/gst_deinit.
然后出现创想GstAudioClock的时候失败：
(cowplayer_test:5466): GLib-GObject-WARNING **: cannot register existing
type 'GstAudioClock'
(cowplayer_test:5466): GLib-CRITICAL **: g_once_init_leave: assertion
'result != 0' failed
(cowplayer_test:5466): GLib-GObject-CRITICAL **: g_object_new: assertion
'G_TYPE_IS_OBJECT (object_type)' failed

Halley Zhao <aihua.halley.zhao at gmail.com> 于2019年6月20日周四 下午6:05写道：

> Hi experts:
> I created a dynamic lib to use gst, and the lib is loaded by dlopen.
> then there is exception to load the lib for a second playback.
>
> 1. if I call gst_deinit() before dlclose the lib. I fail to create any gst
> element next time after calling gst_init() again.  gst_init_check() said
> gst has already been inited.
>
> 0:00:08.140795000  5131 0xffff98003e90 DEBUG               GST_INIT
> gst.c:417:gst_init_check: already initialized gst
> 0:00:08.140939875  5131 0xffff98003e90 WARN     GST_ELEMENT_FACTORY
> gstelementfactory.c:456:gst_element_factory_make: no such element factory
> "appsrc"!
>
> 2. if I skip call gst_deinit() before dlclose the lib, some exception
> comes for g_type_check
> (gdb) bt
> #0  0x0000ffffbeb67dd8 in strcmp () from /usr/lib64/libc.so.6
> #1  0x0000ffffbf16ba5c in g_str_equal () from /usr/lib64/libglib-2.0.so
> #2  0x0000ffffbf16af08 in g_hash_table_lookup ()
>    from /usr/lib64/libglib-2.0.so
> #3  0x0000ffffbf18d648 in g_intern_static_string ()
>    from /usr/lib64/libglib-2.0.so
> #4  0x0000ffffb70548dc in gst_audio_clock_get_type ()
>    from /usr/lib64/libgstaudio-1.0.so.0
> #5  0x0000ffffb705494c in gst_audio_clock_new ()
>    from /usr/lib64/libgstaudio-1.0.so.0
>
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