Trouble with the sdlshare2.c example (gst-plugins-base)

[Matthew Waters]

This MR
https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2750
fixes the sdlshare2 example.

Cheers
-Matt

On 12/7/22 15:02, Matthew Waters wrote:
> Yes, something is broken.  I have a fix for this which I will push
> when ssh access to gitlab works again.
>
> Cheers
> -Matt
>
> On 11/7/22 13:37, Brett Ernst via gstreamer-devel wrote:
>> Hello,
>>
>> I've been trying to get the sdlshare2.c example working, which shares
>> an application's GL context with the glimagesink element. It seems
>> that whenever a context is provided via the gst.gl.app_context
>> context, the pipeline fails to go from NULL to READY state without
>> printing any kind of messages as to why. I originally noticed this in
>> my own code, but using sdlshare2.c without modification also results
>> in the same outcome.
>>
>> Does sdlshare2.c work for anybody else?
>>
>> I'm on a Fedora 36 system using Xorg with the amdgpu video drivers.
>> The GStreamer version is 1.20.0. I've included a snippet of the trace
>> log here, including the part that seems relevant, but the entire log
>> is too enormous to post even on GitHub gists. 
>>
>> Browsing through the code for gstglimagesink.c it doesn't seem like
>> it's even attempting to use the context provided by sdlshare2.c (if I
>> modify it to provide any other value, the same result occurs).
>> Removing the gst.gl.app_context context altogether allows the
>> pipeline to start, but since it's not sharing the context it creates
>> two windows.
>>
>> Just trying to narrow down if the example is broken or if there's
>> something about my system causing this. Any thoughts are appreciated.
>>
>> 0:00:00.171032213 56903      0x1a83000 DEBUG                GST_BUS
>> gstbus.c:338:gst_bus_post:<bus1> [msg 0x1f90da0] posting on bus
>> need-context message: 0x1f90da0, time 99:99:99.999999999, seq-num 20,
>> element 'sink', GstMessageNeedContext,
>> context-type=(string)gst.gl.app_context;
>> 0:00:00.171036873 56903      0x1a83000 DEBUG                    bin
>> gstbin.c:3686:gst_bin_handle_message_func:<pipeline0> [msg 0x1f90da0]
>> handling child sink message of type need-context
>> 0:00:00.171040433 56903      0x1a83000 DEBUG                    bin
>> gstbin.c:4022:gst_bin_handle_message_func:<pipeline0> posting message
>> upward
>> 0:00:00.171045153 56903      0x1a83000 DEBUG                GST_BUS
>> gstbus.c:338:gst_bus_post:<bus2> [msg 0x1f90da0] posting on bus
>> need-context message: 0x1f90da0, time 99:99:99.999999999, seq-num 20,
>> element 'sink', GstMessageNeedContext,
>> context-type=(string)gst.gl.app_context;
>> 0:00:00.171058573 56903      0x1a83000 DEBUG            GST_CONTEXT
>> gstelement.c:3590:gst_element_set_context:<sink> set context
>> 0x1dab920 context, context=(GstGLContext)"\(GstGLWrappedContext\)\
>> glwrappedcontext0";
>> 0:00:00.171068733 56903      0x1a83000 DEBUG                GST_BUS
>> gstbus.c:381:gst_bus_post:<bus2> [msg 0x1f90da0] pushing on async queue
>> 0:00:00.171076833 56903      0x1a83000 DEBUG                GST_BUS
>> gstbus.c:384:gst_bus_post:<bus2> [msg 0x1f90da0] pushed on async queue
>> 0:00:00.171081953 56903      0x1a83000 DEBUG                GST_BUS
>> gstbus.c:377:gst_bus_post:<bus1> [msg 0x1f90da0] dropped
>> 0:00:00.171085653 56903      0x1a83000 DEBUG                GST_BUS
>> gstbus.c:377:gst_bus_post:<bus0> [msg 0x1f90da0] dropped
>> 0:00:00.171089783 56903      0x1a83000 INFO              GST_STATES
>> gstelement.c:3091:gst_element_change_state:<sink> have FAILURE
>> change_state return
>> 0:00:00.171094343 56903      0x1a83000 INFO              GST_STATES
>> gstelement.c:2678:gst_element_abort_state:<sink> aborting state from
>> NULL to READY
>> 0:00:00.171098433 56903      0x1a83000 DEBUG             GST_STATES
>> gstelement.c:3041:gst_element_set_state_func:<sink> returned FAILURE
>> 0:00:00.171103513 56903      0x1a83000 INFO              GST_STATES
>> gstbin.c:2944:gst_bin_change_state_func:<glimagesink0> child 'sink'
>> failed to go to state 2(READY)
>>
>> -Brett
>

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