18035 -> 4018 dezicycles (Tested with LOGOS.DFA, gcc 7, 3950X)
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
libavcodec/dfa.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/libavcodec/dfa.c b/libavcodec/dfa.c
index 0cf3641a38..ab78d66763 100644
--- a/libavcodec/dfa.c
+++ b/libavcodec/dfa.c
@@ -388,9 +388,17 @@ static int dfa_decode_frame(AVCodecContext *avctx,
for (i = 0; i < avctx->height; i++) {
if(version == 0x100) {
int j;
- for(j = 0; j < avctx->width; j++) {
- dst[j] = buf[ (i&3)*(avctx->width /4) + (j/4) +
- ((j&3)*(avctx->height/4) + (i/4))*avctx->width];
+ const uint8_t *buf1 = buf + (i&3)*(avctx->width/4) +
(i/4)*avctx->width;
+ int stride = (avctx->height/4)*avctx->width;
+ for(j = 0; j < avctx->width/4; j++) {
+ dst[4*j+0] = buf1[j + 0*stride];
+ dst[4*j+1] = buf1[j + 1*stride];
+ dst[4*j+2] = buf1[j + 2*stride];
+ dst[4*j+3] = buf1[j + 3*stride];
+ }
+ j *= 4;
+ for(; j < avctx->width; j++) {
+ dst[j] = buf1[(j/4) + (j&3)*stride];
}
} else {
memcpy(dst, buf, avctx->width);
--
2.17.1
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