[Bug 751876] vaapipostproc: enable passthrough on same caps

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=751876

--- Comment #11 from Hyunjun Ko <zzoon at igalia.com> ---
Probably, we can enable passthrough by below
- if both caps are same, passthrough mode is enabled basically.
- once filtering value is set, it turns to non-passthrough mode.
- if (all) filtering value is set to default again, it can turn to passthrough
mode.

To do this, something necessary is below.
- Basically, if both caps are same and no filter value set, passthrough mode
enabled.
- call gst_base_transform_reconfigure_src when filtering value is set
- During reconfigure, we can set passthrough mode with sink/src caps and filter
flag.
- code to reset flags when it turns to default value.

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