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| author | Andreas Rheinhardt <andreas.rheinhardt@gmail.com> | 2020-11-06 10:14:22 +0100 |
|---|---|---|
| committer | Andreas Rheinhardt <andreas.rheinhardt@gmail.com> | 2020-12-08 17:51:46 +0100 |
| commit | 22241d12c7bc7f317832d8101ebed8d2db78a41f (patch) | |
| tree | 9e1dfe0ffa569a83987434cfe4485d14f545a6ca /libavcodec/vp3data.h | |
| parent | 984fdfd042aeec7d48cd906661b2192568874730 (diff) | |
| download | ffmpeg-22241d12c7bc7f317832d8101ebed8d2db78a41f.tar.gz | |
avcodec/vp3: Apply VLC offset during init
By switching to ff_init_vlc_from_lengths() one can apply both positive
as well as negative offsets for free; in this case it even saves space
because one replaces codes tables that don't fit into an uint8_t by
symbols tables that fit into an uint8_t or can even be completely
avoided as they are trivial.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Diffstat (limited to 'libavcodec/vp3data.h')
| -rw-r--r-- | libavcodec/vp3data.h | 24 |
1 files changed, 5 insertions, 19 deletions
diff --git a/libavcodec/vp3data.h b/libavcodec/vp3data.h index a1366788c5..4dc20c5f29 100644 --- a/libavcodec/vp3data.h +++ b/libavcodec/vp3data.h @@ -95,25 +95,11 @@ static const uint8_t vp31_filter_limit_values[64] = { 0, 0, 0, 0, 0, 0, 0, 0 }; -static const uint16_t superblock_run_length_vlc_table[34][2] = { - { 0, 1 }, - - { 4, 3 }, { 5, 3 }, - - { 0xC, 4 }, { 0xD, 4 }, - - { 0x38, 6 }, { 0x39, 6 }, { 0x3A, 6 }, { 0x3B, 6 }, - - { 0xF0, 8 }, { 0xF1, 8 }, { 0xF2, 8 }, { 0xF3, 8 }, - { 0xF4, 8 }, { 0xF5, 8 }, { 0xF6, 8 }, { 0xF7, 8 }, - - { 0x3E0, 10 }, { 0x3E1, 10 }, { 0x3E2, 10 }, { 0x3E3, 10 }, - { 0x3E4, 10 }, { 0x3E5, 10 }, { 0x3E6, 10 }, { 0x3E7, 10 }, - { 0x3E8, 10 }, { 0x3E9, 10 }, { 0x3EA, 10 }, { 0x3EB, 10 }, - { 0x3EC, 10 }, { 0x3ED, 10 }, { 0x3EE, 10 }, { 0x3EF, 10 }, - - { 0x3F, 6 } /* this last VLC is a special case for reading 12 more - * bits from stream and adding the value 34 */ +static const uint8_t superblock_run_length_vlc_lens[34] = { + 1, 3, 3, 4, 4, 6, 6, 6, 6, 8, 8, 8, 8, 8, 8, 8, 8, 10, 10, + 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, + 6, /* This last value is a special case for reading 12 more + * bits from the stream and adding the value 34. */ }; static const uint16_t fragment_run_length_vlc_table[30][2] = { |