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avcodec/utvideodec: Factor multiply out of inner loop

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0.5% faster loop

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Reviewed-by: Steven Liu <lingjiujianke@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-06-27 21:47:35 +02:00
parent 5eb4701b7d
commit 850c6db97d
1 changed files with 4 additions and 2 deletions
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6
libavcodec/utvideodec.c
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@ -195,7 +195,8 @@ static int decode_plane10(UtvideoContext *c, int plane_no,
prev = 0x200; prev = 0x200;
for (j = sstart; j < send; j++) { for (j = sstart; j < send; j++) {
for (i = 0; i < width * step; i += step) { int ws = width * step;
for (i = 0; i < ws; i += step) {
pix = get_vlc2(&gb, vlc.table, VLC_BITS, 3); pix = get_vlc2(&gb, vlc.table, VLC_BITS, 3);
if (pix < 0) { if (pix < 0) {
av_log(c->avctx, AV_LOG_ERROR, "Decoding error\n"); av_log(c->avctx, AV_LOG_ERROR, "Decoding error\n");
@ -299,7 +300,8 @@ static int decode_plane(UtvideoContext *c, int plane_no,
prev = 0x80; prev = 0x80;
for (j = sstart; j < send; j++) { for (j = sstart; j < send; j++) {
for (i = 0; i < width * step; i += step) { int ws = width * step;
for (i = 0; i < ws; i += step) {
pix = get_vlc2(&gb, vlc.table, VLC_BITS, 3); pix = get_vlc2(&gb, vlc.table, VLC_BITS, 3);
if (pix < 0) { if (pix < 0) {
av_log(c->avctx, AV_LOG_ERROR, "Decoding error\n"); av_log(c->avctx, AV_LOG_ERROR, "Decoding error\n");