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video-format: add gst_video_format_info_component()

Guillaume Desmottes requested to merge gdesmott/gst-plugins-base:plane-to-comp into master

New API to find out which components are packed in a given plane. Will prevent us from assuming a 1-1 mapping between planes and components.

See !319 (comment 190783) for extra context.

I implemented it as a function as adding this directly to the GstVideoFormatInfo structure would consume all the padding.

We could add a GST_VIDEO_FORMAT_INFO_COMPONENT if we want to keep the API symmetric with GST_VIDEO_FORMAT_INFO_PLANE.

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