The TreeParser requires information about a lot of the decoder's
current state in order to parse syntax tree elements correctly, so
there has to be some communication between the Decoder and the
TreeParser. Previously, the Decoder would copy its state to the
TreeParser when it changed, however, this was a poor choice. Now,
the TreeParser simply has a reference to its owning Decoder, and
accesses its state directly.
This patch adds compressed header parsing to the VP9 decoder (section
6.4 of the spec). This is the final decoder step before we can start to
decode tiles.
This patch brings all of the previous work together and starts to
actually parse and decode frame information. Currently it only parses
the uncompressed header data (section 6.2 of the spec).
The VP9 specification requires a special decoding process to parse a
lot of the data read from a frame, so this BitStream wrapper implements
that behavior. These processes are defined in section 9 of the
VP9 spec.
This commit initializes the LibVideo library and implements parsing
basic Matroska container files. Currently, it will only parse audio
and video tracks.
