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| author | Andreas Rheinhardt <andreas.rheinhardt@gmail.com> | 2020-12-02 03:52:40 +0100 |
|---|---|---|
| committer | Andreas Rheinhardt <andreas.rheinhardt@outlook.com> | 2021-05-02 05:14:42 +0200 |
| commit | a7f4abbc62cb6b768c9bcb927ba2485ba6e61913 (patch) | |
| tree | 2995d2f17dd43fcede383b8f8ecf0804389cdbf2 /libavcodec/snowdata.h | |
| parent | 56df06dd8346687d6d9b7321f2af41e4fd614ee3 (diff) | |
avcodec/snow: Hardcode table to save space
The size of ff_qexp is only 32 bytes, but the code to generate it at
runtime takes 47 bytes (GCC 9.3, x64, -O3 in an av_cold function); so
just hardcode it.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Diffstat (limited to 'libavcodec/snowdata.h')
| -rw-r--r-- | libavcodec/snowdata.h | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/libavcodec/snowdata.h b/libavcodec/snowdata.h index 490fdf8bd6..ca0c1e3f7a 100644 --- a/libavcodec/snowdata.h +++ b/libavcodec/snowdata.h @@ -124,8 +124,14 @@ const uint8_t * const ff_obmc_tab[4]= { obmc32, obmc16, obmc8, obmc4 }; -/* runtime generated tables */ -uint8_t ff_qexp[QROOT]; +/* ff_qexp[i] = lrintf(128 * 2^(i / QROOT)) with QROOT = 32 */ +const uint8_t ff_qexp[QROOT] = { + 128, 131, 134, 137, 140, 143, 146, 149, 152, 156, 159, + 162, 166, 170, 173, 177, 181, 185, 189, 193, 197, 202, + 206, 211, 215, 220, 225, 230, 235, 240, 245, 251, +}; + +/* table generated at runtime */ int ff_scale_mv_ref[MAX_REF_FRAMES][MAX_REF_FRAMES]; |