[Bug 761747] New: Client-draw problem in glimagesink (Android)

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=761747

            Bug ID: 761747
           Summary: Client-draw problem in glimagesink (Android)
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: gregoire at gentil.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

First, documentation in the source code is not correct here:

https://cgit.freedesktop.org/gstreamer/gst-plugins-bad/tree/ext/gl/gstglimagesink.c#n538

The arguments are context and sample.


Secondly, it seems that GstVideoAffineTransformationMeta is always NULL. In an
Android 6.0.1 Gstreamer-master-git tutorial-5-derived application, I have:


g_signal_connect(G_OBJECT(data->glimagesink), "client-draw",
G_CALLBACK(client_draw_cb), data);


static gboolean client_draw_cb(GstElement *sink, GLuint texture, GstSample
*sample, CustomData *data) {

GstBuffer *buf = gst_sample_get_buffer(sample);
GstVideoAffineTransformationMeta *atm =
gst_buffer_get_video_affine_transformation_meta(buf);
//atm is NULL all the time
atm = gst_buffer_add_video_affine_transformation_meta(buf);
//atm is NULL again

GstVideoAffineTransformationMeta is null and it can't be created.


To give the big picture, my objective is to crop the video. I tried glOrthof
but as I return FALSE because I don't want to deal with the texture, it's
discarded by the original code. Fair enough. So I wanted to use a
GstVideoAffineTransformationMeta. I can't access or create any
GstVideoAffineTransformationMeta in this callback.

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