[Bug 773709] player: Add get video thumbnail API

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=773709

--- Comment #7 from Lyon <lyon.wang at nxp.com> ---
Hi, Slomo, 
  For the previous patch, actually I think it should be called
get_video_sanpshot, because it just get the current position video sample. 

Considering there might be user case that application need get the thumbnail of
the video (while there is no cover-image tag in the stream), also user may need
get video sample at certain position as video thumbnail.

I refined previous patch:
-  Add struct GstPlayerThumbnail_info to set image
type/width/height/pixel-aspect-ratio
-  Add gst_player_get_video_snapshot()  API to get current video snapshot at
current position
-  Add gst_player_get_video_thumbnail() API to get video thumbnail at given
position.

Could you please help review the new patch.

Thanks
Lyon

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