push opengl texture to gstreamer pipeline

[Lusine Hayrapetyan]

Attaching screenshot of pushFrame function, the code looks distorted.
[image: image.png]

On Wed, Aug 4, 2021 at 7:04 PM Lusine Hayrapetyan <
lusinehayrapetyan1992 at gmail.com> wrote:

> Hi Folks,
> I'm struggling with the following issue and can't understand what I'm
> doing wrong.
> I need to pass opengl texture to the gstreamer pipeline.
> I have a rendering thread where I create opengl texture, the following
> objects created in this thread:
> *EGLDisplay display;*
> *EGLContext context;*
>
> I create gstreamer pipeline in the main thread and as described in the
> following article sharing an X11 display and GstGLContext with the bus
> callback.
> http://ystreet00.blogspot.com/2015/09/gstreamer-16-and-opengl-contexts.html
>
> GstGLDisplayEGL and GstGLContext are created in this way:
>
> *GstGLDisplayEGL* gst_display = gst_gl_display_egl_new_with_egl_display
> (display);*
>
>
> *GstGLContext *gl_context =      gst_gl_context_new_wrapped
> (GST_GL_DISPLAY (gst_display),      (guintptr) context,
> GST_GL_PLATFORM_EGL, GST_GL_API_GLES2);*
>
> The first element of my pipeline is appsrc:
> *appsrc stream-type=0 emit-signals=1 format=3
> caps=video/x-raw(memory:GLMemory),  width=300, height=300,
> framerate=(fraction)20/1, format=(string)RGBA ! gldownload ! ...*
>
> I use need-data callback to create a buffer from texture_id and and push
> it in the appsrc:
> *g_signal_connect (state->appsrc, "need-data", G_CALLBACK (* pushFrame *),
> state);*
>
> *bool pushFrame()*
>
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> *{     // Wrap the texture into GstGLMemory    GstVideoInfo vinfo;
> gst_video_info_set_format(&vinfo, GST_VIDEO_FORMAT_RGBA, 300, 300);
> GstAllocator* allocator =
> GST_ALLOCATOR(gst_gl_memory_allocator_get_default(gl_context));
> GstGLVideoAllocationParams* params =
> gst_gl_video_allocation_params_new_wrapped_texture(
>  state->gl_context, NULL, &vinfo, 0, NULL, GST_GL_TEXTURE_TARGET_2D,
> GST_GL_RGBA, * texture_id
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> *,      NULL, 0);    // The following line produces an error!!!
> GstGLMemory* glMemory = GST_GL_MEMORY_CAST(gst_gl_base_memory_alloc(
> GST_GL_BASE_MEMORY_ALLOCATOR_CAST(allocator), (GstGLAllocationParams*)
> params));    gst_gl_allocation_params_free((GstGLAllocationParams
> *)params);    gst_object_unref(allocator);    // Attach GstGLMemory object
> into buffer, timestamp the buffer and push it downstream    GstBuffer*
> buffer = gst_buffer_new();    gst_buffer_append_memory(buffer,
> GST_MEMORY_CAST(glMemory));    // Put timestamps into buffer
> GST_BUFFER_PTS (buffer) = timestamp;    GST_BUFFER_DURATION (buffer) =
> gst_util_uint64_scale_int (1, GST_SECOND, 2);    timestamp +=
> GST_BUFFER_DURATION (buffer);    GstFlowReturn ret;
> g_signal_emit_by_name(state->appsrc, "push-buffer", buffer, &ret);    if
> (ret != GST_FLOW_OK)    {        // Something wrong, stop pushing.
> g_printerr("Something went wrong: Pushing buffer into appsrc is
> stopped.\n");        return false;    }    return true;}*
>
> pushFrame produces the following error:
> gst_gl_context_thread_add: assertion 'context->priv->active_thread ==
> g_thread_self ()' failIed
>
> What am I doing wrong or how can push gpu texture to gstreamer?
>
> Thanks,
> Lusine
>
>
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