vp9parser: Add API for parsing superframe info
Some elements (e.g. d3d11vp9dec, vaapivp9dec) are using their own implementations for superframe parsing. To reduce redundant code, we need to add API to the parser.
Edited by Yeongjin Jeong
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Some elements (e.g. d3d11vp9dec, vaapivp9dec) are using their own implementations for superframe parsing. To reduce redundant code, we need to add API to the parser.