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alac: reject rice_limit 0 if compression is used

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If rice_limit is 0, k can be 0 in decode_scalar, which calls show_bits(gb, k).

Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Andreas Cadhalpun 2015-04-24 00:01:43 +02:00 committed by Michael Niedermayer
parent 802c0af68f
commit 4b657a1b1e
1 changed files with 5 additions and 0 deletions

5
libavcodec/alac.c

@ -316,6 +316,11 @@ static int decode_element(AVCodecContext *avctx, AVFrame *frame, int ch_index,
int lpc_quant[2];
int rice_history_mult[2];
if (!alac->rice_limit) {
avpriv_request_sample(alac->avctx, "Compression with rice limit 0");
return AVERROR(ENOSYS);
}
decorr_shift = get_bits(&alac->gb, 8);
decorr_left_weight = get_bits(&alac->gb, 8);