[FFmpeg-devel] [libav-devel] [PATCH] svq1enc: fix out of bounds reads

[Andreas Cadhalpun]

On 21.01.2016 23:24, Luca Barbato wrote:
> On 21/01/16 23:04, Andreas Cadhalpun wrote:
>> level can be up to 5, but there are only four codebooks.
>>
>> Fixes ubsan runtime error: index 5 out of bounds for type 'int8_t
>> [4][96]'
>>
>> Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com>
>> ---
>>  libavcodec/svq1enc.c | 6 +++---
>>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> What is the level 5?

Each block size is assigned a level [1]:
 level 5  16x16
 level 4  16x8
 level 3  8x8
 level 2  8x4
 level 1  4x4
 level 0  4x2

Best regards,
Andreas


1: http://wiki.multimedia.cx/index.php?title=Sorenson_Video_1