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avcodec/hevc_refs: Optimize 16bit generate_missing_ref() 

Fixes: Timeout (86sec -> 8sec) [these numbers assume also "[FFmpeg-devel] [PATCH 2/5] [RFC] avcodec/hevcdec: Check for overread in hls_decode_entry()"]
Fixes: 15702/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HEVC_fuzzer-5657764929470464

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 2019-08-06 18:05:02 +02:00
parent 950a21e83c
commit da8936969f
1 changed files with 6 additions and 6 deletions
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12
libavcodec/hevc_refs.c
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@ -394,7 +394,7 @@ static void mark_ref(HEVCFrame *frame, int flag)
static HEVCFrame *generate_missing_ref(HEVCContext *s, int poc)
{
HEVCFrame *frame;
int i, x, y;
int i, y;
frame = alloc_frame(s);
if (!frame)
@ -407,11 +407,11 @@ static HEVCFrame *generate_missing_ref(HEVCContext *s, int poc)
frame->frame->buf[i]->size);
} else {
for (i = 0; frame->frame->data[i]; i++)
for (y = 0; y < (s->ps.sps->height >> s->ps.sps->vshift[i]); y++)
for (x = 0; x < (s->ps.sps->width >> s->ps.sps->hshift[i]); x++) {
AV_WN16(frame->frame->data[i] + y * frame->frame->linesize[i] + 2 * x,
1 << (s->ps.sps->bit_depth - 1));
}
for (y = 0; y < (s->ps.sps->height >> s->ps.sps->vshift[i]); y++) {
uint8_t *dst = frame->frame->data[i] + y * frame->frame->linesize[i];
AV_WN16(dst, 1 << (s->ps.sps->bit_depth - 1));
av_memcpy_backptr(dst + 2, 2, 2*(s->ps.sps->width >> s->ps.sps->hshift[i]) - 2);
}
}
}