On 04.12.2015 23:49, Claudio Freire wrote:
> On Fri, Dec 4, 2015 at 2:23 PM, Andreas Cadhalpun
> <andreas.cadhal...@googlemail.com> wrote:
>> If minq is negative, the range of sf_idx can be larger than
>> SCALE_MAX_DIFF allows, causing assertion failures later in
>> encode_scale_factors.
>>
>> Signed-off-by: Andreas Cadhalpun <andreas.cadhal...@googlemail.com>
>> ---
>> libavcodec/aaccoder.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/libavcodec/aaccoder.c b/libavcodec/aaccoder.c
>> index 2a0cb1f..e8a61ce 100644
>> --- a/libavcodec/aaccoder.c
>> +++ b/libavcodec/aaccoder.c
>> @@ -370,7 +370,7 @@ static void search_for_quantizers_anmr(AVCodecContext
>> *avctx, AACEncContext *s,
>> }
>> while (idx) {
>> sce->sf_idx[bandaddr[idx]] = minq + q0;
>> - minq = paths[idx][minq].prev;
>> + minq = FFMAX(paths[idx][minq].prev, 0);
>> idx--;
>> }
>> //set the same quantizers inside window groups
>
> Actually, a negative .prev signals an impossible path.
>
> So perhaps the attached patch (well, git diff) would go better? (if
> you confirm it passes fuzzing I'll push it)
That diff doesn't change anything, because in the problematic case
paths[idx][i].cost is always inf, anyway.
Best regards,
Andreas
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