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alac: Reject rice_limit 0 if compression is used

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If in compression mode rice_limit = 0 leads to call
`show_bits(gb, k)` in `decode_scalar` with k = 0.

Request a sample in case it is valid and it should be accepted.

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

CC: libav-stable@libav.org
This commit is contained in:
Andreas Cadhalpun 2015-04-24 00:01:43 +02:00 committed by Luca Barbato
parent 295e05a762
commit 243e8443cd
1 changed files with 6 additions and 0 deletions
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6
libavcodec/alac.c
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@ -307,6 +307,12 @@ 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);