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

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Halley Zhao

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

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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Halley Zhao

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

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 <[hidden email]> 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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Nicolas Dufresne-5

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

In reply to this post by Halley Zhao

Le jeu. 20 juin 2019 06 h 10, Halley Zhao <[hidden email]> a écrit :

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.

GStreamer (and glib) cannot be loaded twice.

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.

gst_deinit() is only there for debugging.

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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Halley Zhao

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

In reply to this post by Halley Zhao

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().

Halley Zhao <[hidden email]> 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 <[hidden email]> 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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Nicolas Dufresne-5

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

Le jeu. 20 juin 2019 08 h 40, Halley Zhao <[hidden email]> 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 <[hidden email]> 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 <[hidden email]> 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

_______________________________________________
gstreamer-devel mailing list
[hidden email]
https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

_______________________________________________
gstreamer-devel mailing list
[hidden email]
https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel