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dca: clear inactive subbands only once in qmf_32_subbands()

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Writing zeros to the high entries in the array need only be
done once as the cutoff position is constant throughout the
loop.

Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard 2011-09-28 21:00:35 +01:00
parent 1ee2014190
commit bf00a73ace
1 changed files with 3 additions and 2 deletions
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5
libavcodec/dca.c
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@ -898,6 +898,9 @@ static void qmf_32_subbands(DCAContext * s, int chans,
else /* Perfect reconstruction */
prCoeff = fir_32bands_perfect;
for (i = sb_act; i < 32; i++)
s->raXin[i] = 0.0;
/* Reconstructed channel sample index */
for (subindex = 0; subindex < 8; subindex++) {
/* Load in one sample from each subband and clear inactive subbands */
@ -905,8 +908,6 @@ static void qmf_32_subbands(DCAContext * s, int chans,
uint32_t v = AV_RN32A(&samples_in[i][subindex]) ^ ((i-1)&2)<<30;
AV_WN32A(&s->raXin[i], v);
}
for (; i < 32; i++)
s->raXin[i] = 0.0;
s->synth.synth_filter_float(&s->imdct,
s->subband_fir_hist[chans], &s->hist_index[chans],