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avcodec/lagarith: Optimize FRAME_SOLID_RGBA 

Changes 5466110 decicycles to 1798072 decicycles (tested with fate-suite/lagarith/lag-rgb32.avi)

Fixes: Timeout
Fixes: 9484/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_LAGARITH_fuzzer-5707859156271104

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-08-13 00:19:55 +02:00
parent de1b44c206
commit dbac849c4d
1 changed files with 7 additions and 1 deletions
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8
libavcodec/lagarith.c
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@ -572,8 +572,14 @@ static int lag_decode_frame(AVCodecContext *avctx,
dst = p->data[0];
if (frametype == FRAME_SOLID_RGBA) {
int qwidth = avctx->width>>2;
uint64_t c = ((uint64_t)offset_gu << 32) | offset_gu;
for (j = 0; j < avctx->height; j++) {
for (i = 0; i < avctx->width; i++)
for (i = 0; i < qwidth; i++) {
AV_WN64(dst + i * 16 , c);
AV_WN64(dst + i * 16 + 8, c);
}
for (i = 4*qwidth; i < avctx->width; i++)
AV_WN32(dst + i * 4, offset_gu);
dst += p->linesize[0];
}