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imc: Catch a division by zero

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Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Reviewed-by: Kostya Shishkov
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Luca Barbato 2013-07-09 09:19:30 +02:00 • committed by Michael Niedermayer
parent 7d9cb12689
commit 87fb18c3e4
1 changed files with 4 additions and 0 deletions
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4
libavcodec/imc.c
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@ -450,6 +450,10 @@ static int bit_allocation(IMCContext *q, IMCChannel *chctx,
iacc += chctx->bandWidthT[i];
summa += chctx->bandWidthT[i] * chctx->flcoeffs4[i];
}
if (!iacc)
return AVERROR_INVALIDDATA;
chctx->bandWidthT[BANDS - 1] = 0;
summa = (summa * 0.5 - freebits) / iacc;