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

[Nicolas Dufresne]

Le jeu. 20 juin 2019 08 h 40, Halley Zhao <aihua.halley.zhao at gmail.com> a
écrit :

> translate it：
>
> I tried to move gst_init/gst_deinit outside of the dynamic lib, it means
> gst_init/gst_deinit is done once in the process.
> then, there is error to create GstAudioClock for the second run. I guess
> there are some static data for g_type/gstreamer which isn't de-inited after
> dlclose().
>

GStreamer or Glib DLL/so cannot be loaded twice (didn't I say that
already?). Just load and leak it to avoid these errors.



> (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6:29写道：
>
>> 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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