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huffyuvdec: trick for plane decoding, 8bits

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10496 -> 9105 cycles.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Christophe Gisquet 2014-06-04 20:48:57 +00:00 committed by Michael Niedermayer
parent 35dae62204
commit a37020402a
1 changed files with 8 additions and 10 deletions
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18
libavcodec/huffyuvdec.c
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@ -637,16 +637,12 @@ static void decode_422_bitstream(HYuvContext *s, int count)
/* TODO instead of restarting the read when the code isn't in the first level
* of the joint table, jump into the 2nd level of the individual table. */
#define READ_2PIX_PLANE(dst0, dst1, plane){\
uint16_t code = get_vlc2(&s->gb, s->vlc[4+plane].table, VLC_BITS, 1);\
if(code != 0xffff){\
dst0 = code>>8;\
dst1 = code;\
}else{\
dst0 = get_vlc2(&s->gb, s->vlc[plane].table, VLC_BITS, 3);\
dst1 = get_vlc2(&s->gb, s->vlc[plane].table, VLC_BITS, 3);\
}\
}
#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)
#define READ_2PIX_PLANE14(dst0, dst1, plane){\
int16_t code = get_vlc2(&s->gb, s->vlc[4+plane].table, VLC_BITS, 1);\
if(code != (int16_t)0xffff){\
@ -671,6 +667,7 @@ static void decode_plane_bitstream(HYuvContext *s, int count, int plane)
count/=2;
if (s->bps <= 8) {
OPEN_READER(re, &s->gb);
if (count >= (get_bits_left(&s->gb)) / (31 * 2)) {
for (i = 0; i < count && get_bits_left(&s->gb) > 0; i++) {
READ_2PIX_PLANE(s->temp[0][2 * i], s->temp[0][2 * i + 1], plane);
@ -680,6 +677,7 @@ static void decode_plane_bitstream(HYuvContext *s, int count, int plane)
READ_2PIX_PLANE(s->temp[0][2 * i], s->temp[0][2 * i + 1], plane);
}
}
CLOSE_READER(re, &s->gb);
} else if (s->bps <= 14) {
if (count >= (get_bits_left(&s->gb)) / (31 * 2)) {
for (i = 0; i < count && get_bits_left(&s->gb) > 0; i++) {