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avcodec/hnm4video: Optimize postprocess_current_frame() 

Improves: Timeout (220sec -> 108sec)
Improves: 15570/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HNM4_VIDEO_fuzzer-5085482213441536

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Tomas Härdin <tjoppen@acc.umu.se>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-08-03 01:49:55 +02:00
parent aecf5cbd68
commit cd460f4da0
1 changed files with 8 additions and 5 deletions
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13
libavcodec/hnm4video.c
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@ -117,14 +117,17 @@ static void unpack_intraframe(AVCodecContext *avctx, uint8_t *src,
static void postprocess_current_frame(AVCodecContext *avctx)
{
Hnm4VideoContext *hnm = avctx->priv_data;
uint32_t x, y, src_x, src_y;
uint32_t x, y, src_y;
int width = hnm->width;
for (y = 0; y < hnm->height; y++) {
uint8_t *dst = hnm->processed + y * width;
const uint8_t *src = hnm->current;
src_y = y - (y % 2);
src_x = src_y * hnm->width + (y % 2);
for (x = 0; x < hnm->width; x++) {
hnm->processed[(y * hnm->width) + x] = hnm->current[src_x];
src_x += 2;
src += src_y * width + (y % 2);
for (x = 0; x < width; x++) {
dst[x] = *src;
src += 2;
}
}
}