avcodec/rv10: Reduce number of exceptions when reading VLC value
RealVideo 1.0 uses an insane way to encode DC coefficients: There are several symbols that (for no good reason whatsoever) have multiple encodings, leading to longer codes than necessary. More specifically, the tree for the 256 luma symbols contains 255 codes belonging to 255 different symbols on the left; going further right, the tree consists of two blocks of 128 codes each of length 14 encoding consecutive numbers (including two encodings for the symbol missing among the 255 codes on the left); this is followed by two blocks of codes of length 16 each containing 256 elements with consecutive symbols (i.e. each of the blocks allows to encode all symbols). The rest of the tree consists of 2^11 codes that all encode the same symbol. The tree for the 256 chroma symbols is similar, but is missing the blocks of length 256 and there are only 2^9 consecutive codes that encode the same symbol; furthermore, the chroma tree is incomplete: The right-most node has no right child. All of this caused problems when parsing these codes; the reason is that the code for this predates commit b613bacc which added support for explicit symbol tables and thereby removed the requirement that different codes have different symbols. In order to address this, the trees used for parsing were incomplete: They contained the 255 codes on the left and one code for the remaining symbol. Whenever a code not in these trees was encountered, it was dealt with in special cases (one for each of the blocks mentioned above). This commit reduces the number of special cases: Using a symbols table allows to treat the blocks of consecutive symbols like ordinary codes; only the blocks encoding a single symbol are still treated specially (in order not to waste memory on tables for them). In order to not increment the size of the tables used to initialize the VLCs both the symbols as well as the lengths are now run-length encoded. Signed-off-by: NAndreas Rheinhardt <andreas.rheinhardt@gmail.com>
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