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| author | Michael Niedermayer <michaelni@gmx.at> | 2014-05-27 01:33:59 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2014-06-04 02:03:34 +0200 |
| commit | d8ae0dfd999db6721892a1242e0baaa34af5135d (patch) | |
| tree | aafe7cc7e96aea113ad375cbc09f7391c0b000ef | |
| parent | 4fb4bf7289de2ceb58d1700f60b5c049f7907391 (diff) | |
| download | ffmpeg-d8ae0dfd999db6721892a1242e0baaa34af5135d.tar.gz | |
avcodec/lagarithrac: increase LUT from 256 to 1024 bytes
about 2 cycles (~1%) faster lag_get_rac()
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
| -rw-r--r-- | libavcodec/lagarithrac.c | 4 | ||||
| -rw-r--r-- | libavcodec/lagarithrac.h | 2 |
2 files changed, 3 insertions, 3 deletions
diff --git a/libavcodec/lagarithrac.c b/libavcodec/lagarithrac.c index 895acb0d35..c24064607c 100644 --- a/libavcodec/lagarithrac.c +++ b/libavcodec/lagarithrac.c @@ -45,9 +45,9 @@ void ff_lag_rac_init(lag_rac *l, GetBitContext *gb, int length) l->range = 0x80; l->low = *l->bytestream >> 1; - l->hash_shift = FFMAX((int)l->scale - 8, 0); + l->hash_shift = FFMAX((int)l->scale - 10, 0); - for (i = j = 0; i < 256; i++) { + for (i = j = 0; i < 1024; i++) { unsigned r = i << l->hash_shift; while (l->prob[j + 1] <= r) j++; diff --git a/libavcodec/lagarithrac.h b/libavcodec/lagarithrac.h index ebc6bef22d..7d60d56c2f 100644 --- a/libavcodec/lagarithrac.h +++ b/libavcodec/lagarithrac.h @@ -48,7 +48,7 @@ typedef struct lag_rac { const uint8_t *bytestream_end; /**< End position of input bytestream. */ uint32_t prob[258]; /**< Table of cumulative probability for each symbol. */ - uint8_t range_hash[256]; /**< Hash table mapping upper byte to approximate symbol. */ + uint8_t range_hash[1024]; /**< Hash table mapping upper byte to approximate symbol. */ } lag_rac; void ff_lag_rac_init(lag_rac *l, GetBitContext *gb, int length); |