[Bug 773261] gstplayer: Add some gstplayer API

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=773261

--- Comment #13 from Lyon <lyon.wang at nxp.com> ---
Hi, slomo
    I have some questions about your comments.
- for above gst_player_get_video_num / _get_audio_num / get_text_num API
you said there is no need to have these API as we can get media_info by
_get_xxx_streams. yes , we can the Glist of audio/video/text stream, but will
it be more convenient to get total track num directly instead of get the list
and count the track num?

- For the rotation part
you mentioned we can use videoflip plugin to realize rotation. but considering
the performance, if using videplip by software process, on embedded system, it
is much slower than directly using video-sink 's "rotate-method"/"rotate"
property. Like in glimagesink, there is 'rotate-method'. by the hardware
video-sink, the performance would be much better than videoflip.

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