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aacdec: fix undefined shifts

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Since nnz can be zero, this is needed to avoid a shift by 32.

Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard 2011-10-08 13:41:23 +01:00
parent a00676e48e
commit d12294304a
1 changed files with 2 additions and 2 deletions
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4
libavcodec/aacdec.c
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@ -1129,7 +1129,7 @@ static int decode_spectrum_and_dequant(AACContext *ac, float coef[1024],
GET_VLC(code, re, gb, vlc_tab, 8, 2);
cb_idx = cb_vector_idx[code];
nnz = cb_idx >> 8 & 15;
bits = SHOW_UBITS(re, gb, nnz) << (32-nnz);
bits = nnz ? GET_CACHE(re, gb) : 0;
LAST_SKIP_BITS(re, gb, nnz);
cf = VMUL4S(cf, vq, cb_idx, bits, sf + idx);
} while (len -= 4);
@ -1169,7 +1169,7 @@ static int decode_spectrum_and_dequant(AACContext *ac, float coef[1024],
GET_VLC(code, re, gb, vlc_tab, 8, 2);
cb_idx = cb_vector_idx[code];
nnz = cb_idx >> 8 & 15;
sign = SHOW_UBITS(re, gb, nnz) << (cb_idx >> 12);
sign = nnz ? SHOW_UBITS(re, gb, nnz) << (cb_idx >> 12) : 0;
LAST_SKIP_BITS(re, gb, nnz);
cf = VMUL2S(cf, vq, cb_idx, sign, sf + idx);
} while (len -= 2);