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arm: fix use of uninitialised value in ff_fft_fixed_init_arm()

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When initialising an FFTContext for a plain FFT, mdct_bits is not set
and can contain a garbage value.  Since nbits is always valid and for
MDCT operation is mdct_bits - 2 checking this instead avoids using an
uninitialised value while having the same effect.

Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard 2012-12-06 23:51:01 +00:00
parent 2c96392277
commit 92dad6687f
1 changed files with 1 additions and 1 deletions
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2
libavcodec/arm/fft_fixed_init_arm.c
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@ -36,7 +36,7 @@ av_cold void ff_fft_fixed_init_arm(FFTContext *s)
s->fft_calc = ff_fft_fixed_calc_neon;
#if CONFIG_MDCT
if (!s->inverse && s->mdct_bits >= 5) {
if (!s->inverse && s->nbits >= 3) {
s->mdct_permutation = FF_MDCT_PERM_INTERLEAVE;
s->mdct_calc = ff_mdct_fixed_calc_neon;
s->mdct_calcw = ff_mdct_fixed_calcw_neon;