[Bug 749950] encoder: VP8: Add CBR Encoding mode

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=749950

--- Comment #8 from Hyunjun Ko <zzoon at igalia.com> ---
On CBR mode, it requires clamp_qindex_high/low in
VAEncPictureParameterBufferVP8, otherwise quantizer is set to 0 by default,
which means that encoder doesn't use it during calculation of rate control
algorithm.
I set to 0 as min, 127 as max, which is allowed.

Regarding calculation of HRD parameter,
I refered to libyami's code, but I'm not sure this does make sense.

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