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Commit Graph

7 Commits (8aed3911fc454e79697e183660bf30d31334a64b)

Author	SHA1	Message	Date
Andreas Rheinhardt	e67e4d43bd	avcodec/clearvideo: Apply VLC offset during init ... Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>	4 years ago
Andreas Rheinhardt	ef9652bab2	avcodec/clearvideo: Improve handling of VLC escape values ... Both the motion vector as well as the bias VLCs have an escape code; for the motion vectors, this value depended on the specific VLC table, whereas all the bias VLCs used the same value; the escape value has not been inlined in the latter case. But for both kinds of VLCs there are lots of values that are unused for all the VLCs of each kind and each of these can be used as common escape value, thus allowing to inline the escape value. This commit implements this. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>	4 years ago
Andreas Rheinhardt	1d3ec27bd5	avcodec/clearvideo: Avoid huge VLC length tables ... After the motion vector and bias values tables have been reordered so that the codes are ordered from left to right, it emerged that the length of these entries are actually ascending for every table. Therefore it is possible to encode them in a run-length style and create the actual length tables during runtime. This commit implements this. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>	4 years ago
Andreas Rheinhardt	e97081a624	avcodec/clearvideo: Avoid code duplication when initializing VLCs ... Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>	4 years ago
Andreas Rheinhardt	c82a559e6f	avcodec/clearvideo: Avoid code tables for initializing VLCs ... The ClearVideo decoder uses VLC tables that are initialized at runtime from static length, symbol and codes tables. Yet the code tables can be omitted by subjecting all of these tables to the permutation that orders the codes from left to right in the tree. After this is done, the codes can be easily computed at runtime from the lengths and therefore omitted. This saves about 10KB. Only one minor complication is encountered when doing so: The tree corresponding to the AC VLC codes is incomplete; but this can be handled by adding an entry with negative length. Furthermore, there are also VLCs that are only initialized with lengths and codes tables with codes of type uint16_t. These have also been switched to ff_init_vlc_from_lengths() as this means that one can replace the uint16_t codes tables with uint8_t symbols tables. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>	4 years ago
James Almer	4d89b5f844	avcodec/clearvideo: add missing wrappers to clearvideodata.h ... Fixes make fate-source Signed-off-by: James Almer <jamrial@gmail.com>	7 years ago
Paul B Mahol	a874586994	avcodec/clearvideo: add inter-frame decoding ... Signed-off-by: Paul B Mahol <onemda@gmail.com>	7 years ago