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huffyuvdec: remove superfluous check

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An invalid entry already has the property of having a negative number
of bits, so remove the check on the reserved value, and rearrange the
code as a consequence.

346800 decicycles in 422, 262079 runs, 65 skips
168197 decicycles in gray, 262077 runs, 67 skips
Overall time: 7.878s

319076 decicycles in 422, 262096 runs, 48 skips
159875 decicycles in gray, 262057 runs, 87 skips
Overall time: 7.394s

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Christophe Gisquet 2014-06-04 20:48:58 +00:00 committed by Michael Niedermayer
parent a37020402a
commit 6848325acb
1 changed files with 6 additions and 8 deletions
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14
libavcodec/huffyuvdec.c
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@ -586,13 +586,13 @@ static av_cold int decode_init_thread_copy(AVCodecContext *avctx)
#define GET_VLC_DUAL(dst0, dst1, name, gb, dtable, table1, table2, \
bits, max_depth, rsvd ) \
bits, max_depth) \
do { \
unsigned int index = SHOW_UBITS(name, gb, bits); \
int code = dtable[index][0]; \
int n = dtable[index][1]; \
int code, n = dtable[index][1]; \
\
if (code != rsvd && n>0) { \
if (n>0) { \
code = dtable[index][0]; \
dst0 = code>>8; \
dst1 = code; \
LAST_SKIP_BITS(name, gb, n); \
@ -609,8 +609,7 @@ static av_cold int decode_init_thread_copy(AVCodecContext *avctx)
#define READ_2PIX(dst0, dst1, plane1)\
UPDATE_CACHE(re, &s->gb); \
GET_VLC_DUAL(dst0, dst1, re, &s->gb, s->vlc[4+plane1].table, \
s->vlc[0].table, s->vlc[plane1].table, \
VLC_BITS, 3, 0xffff)
s->vlc[0].table, s->vlc[plane1].table, VLC_BITS, 3)
static void decode_422_bitstream(HYuvContext *s, int count)
{
@ -640,8 +639,7 @@ static void decode_422_bitstream(HYuvContext *s, int count)
#define READ_2PIX_PLANE(dst0, dst1, plane) \
UPDATE_CACHE(re, &s->gb); \
GET_VLC_DUAL(dst0, dst1, re, &s->gb, s->vlc[4+plane].table, \
s->vlc[plane].table, s->vlc[plane].table, \
VLC_BITS, 3, 0xffff)
s->vlc[plane].table, s->vlc[plane].table, VLC_BITS, 3)
#define READ_2PIX_PLANE14(dst0, dst1, plane){\
int16_t code = get_vlc2(&s->gb, s->vlc[4+plane].table, VLC_BITS, 1);\