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avcodec/dfa: Optimize output reshuffle loop

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18035 -> 4018 dezicycles (Tested with LOGOS.DFA, gcc 7, 3950X)

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2022-03-11 20:57:04 +01:00
parent d1bf5b7d96
commit 18bc612f2f
1 changed files with 11 additions and 3 deletions
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14
libavcodec/dfa.c
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@ -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);