[FFmpeg-cvslog] avcodec/cbs_vp8: Improve the bitstream position check
Dai, Jianhui J
git at videolan.org
Tue Mar 26 15:13:17 EET 2024
ffmpeg | branch: master | Dai, Jianhui J <jianhui.j.dai-at-intel.com at ffmpeg.org> | Tue Mar 19 06:05:17 2024 +0000| [61afe4d98ce62d9dfc6f0548e18730ba2f621cc2] | committer: Ronald S. Bultje
avcodec/cbs_vp8: Improve the bitstream position check
The VP8 compressed header may not be byte-aligned due to boolean
coding. Round up byte count for accurate data positioning.
Signed-off-by: Jianhui Dai <jianhui.j.dai at intel.com>
Signed-off-by: Ronald S. Bultje <rsbultje at gmail.com>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=61afe4d98ce62d9dfc6f0548e18730ba2f621cc2
---
libavcodec/cbs_vp8.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/libavcodec/cbs_vp8.c b/libavcodec/cbs_vp8.c
index afa2e4f980..1f80f34faf 100644
--- a/libavcodec/cbs_vp8.c
+++ b/libavcodec/cbs_vp8.c
@@ -339,7 +339,9 @@ static int cbs_vp8_read_unit(CodedBitstreamContext *ctx,
return err;
pos = get_bits_count(&gbc);
- pos /= 8;
+ // Position may not be byte-aligned after compressed header; Round up byte
+ // count for accurate data positioning.
+ pos = (pos + 7) / 8;
av_assert0(pos <= unit->data_size);
frame->data_ref = av_buffer_ref(unit->data_ref);
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