[Bug 739693] assrender doesn't render frames into given memory area

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=739693
  GStreamer | gst-plugins-base | git

--- Comment #4 from Andreas Frisch <fraxinas at opendreambox.org> 2014-11-06 08:25:29 UTC ---
I basically get a pre-allocated dma pointer from my application which i then
wish to render the subtitles to.
therefore, in my gstreamer element i create a new buffer with this memory area,
memset an empty bitmap there and push it into assrender (via subtitleoverlay).
it arrives there, correctly (i was tracking that by multiple debug outputs) and
changes after the gst_video_frame_map call.

this is how i create the buffer. gdi_data is my fixed pointer:
nv12frame = gst_buffer_new_wrapped_full (GST_MEMORY_FLAG_PHYSICALLY_CONTIGUOUS,
gdi_data, size, 0, size, NULL, NULL);

i display the pointer of the buffer's data using the three lines

GstMapInfo map;
gst_buffer_map(buffer, &map, GST_MAP_READ);
GST_INFO_OBJECT (buffer, "....... data@%p refcount=%i", map.data,
GST_OBJECT_REFCOUNT_VALUE(buffer));
gst_buffer_unmap(buffer, &map);

there's probably a cleverer way how to do it though.

it shows that during gst_video_frame_map, the refcount is increased from 1 to 2
and the flags and the pointer changes.

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