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avcodec/ac3: Fix undefined shift in ff_ac3_bit_alloc_calc_mask() 

Found-by: Clang -fsanitize=shift
Reported-by: Thierry Foucu <tfoucu@google.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2015-03-15 11:21:50 +01:00
parent 94ccbad488
commit e3f5b6f16d
1 changed files with 2 additions and 2 deletions
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4
libavcodec/ac3.c
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@ -200,9 +200,9 @@ int ff_ac3_bit_alloc_calc_mask(AC3BitAllocParameters *s, int16_t *band_psd,
if (band >= AC3_CRITICAL_BANDS || dba_lengths[seg] > AC3_CRITICAL_BANDS-band)
return -1;
if (dba_values[seg] >= 4) {
delta = (dba_values[seg] - 3) << 7;
delta = (dba_values[seg] - 3) * 128;
} else {
delta = (dba_values[seg] - 4) << 7;
delta = (dba_values[seg] - 4) * 128;
}
for (i = 0; i < dba_lengths[seg]; i++) {
mask[band++] += delta;