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| author | Andreas Rheinhardt <andreas.rheinhardt@gmail.com> | 2020-12-29 22:09:10 +0100 |
|---|---|---|
| committer | Andreas Rheinhardt <andreas.rheinhardt@gmail.com> | 2021-01-27 11:53:22 +0100 |
| commit | 9f38fac053010205806ece11e6aea9b7d3bde041 (patch) | |
| tree | 7fe7818f7331aae5d8f423a2a4ec6af403765a17 | |
| parent | ba96f2254adb23802752ca41f2bd926ffbf15880 (diff) | |
| download | ffmpeg-9f38fac053010205806ece11e6aea9b7d3bde041.tar.gz | |
avcodec/h261dec: Make VLC smaller
The VLC for the macroblock address increment uses nine bits;
yet there is no code with this length: All codes are either shorter or
longer. So one can make the table smaller without changing the amount of
codes that need more than one round of parsing.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
| -rw-r--r-- | libavcodec/h261dec.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/libavcodec/h261dec.c b/libavcodec/h261dec.c index 817453f60c..2b3408d7b3 100644 --- a/libavcodec/h261dec.c +++ b/libavcodec/h261dec.c @@ -35,7 +35,7 @@ #include "h261.h" #include "internal.h" -#define H261_MBA_VLC_BITS 9 +#define H261_MBA_VLC_BITS 8 #define H261_MTYPE_VLC_BITS 6 #define H261_MV_VLC_BITS 7 #define H261_CBP_VLC_BITS 9 @@ -52,7 +52,7 @@ static av_cold void h261_decode_init_static(void) { INIT_VLC_STATIC(&h261_mba_vlc, H261_MBA_VLC_BITS, 35, ff_h261_mba_bits, 1, 1, - ff_h261_mba_code, 1, 1, 662); + ff_h261_mba_code, 1, 1, 540); INIT_VLC_STATIC(&h261_mtype_vlc, H261_MTYPE_VLC_BITS, 10, ff_h261_mtype_bits, 1, 1, ff_h261_mtype_code, 1, 1, 80); |