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swr: use local variable for ns_errors

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71 -> 63 kcycles

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-01-12 17:27:35 +01:00
parent b5d9e5d06c
commit 68ff7d265f
1 changed files with 3 additions and 2 deletions
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5
libswresample/dither_template.c
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@ -33,14 +33,15 @@ void RENAME(swri_noise_shaping)(SwrContext *s, AudioData *dsts, const AudioData
const float *noise = ((const float *)noises->ch[ch]) + s->dither.noise_pos;
const DELEM *src = (const DELEM*)srcs->ch[ch];
DELEM *dst = (DELEM*)dsts->ch[ch];
float *ns_errors = s->dither.ns_errors[ch];
pos = s->dither.ns_pos;
for (i=0; i<count; i++) {
double d1, d = src[i]*S_1;
for(j=0; j<taps; j++)
d -= s->dither.ns_coeffs[j] * s->dither.ns_errors[ch][pos + j];
d -= s->dither.ns_coeffs[j] * ns_errors[pos + j];
pos = pos ? pos - 1 : taps - 1;
d1 = rint(d + noise[i]);
s->dither.ns_errors[ch][pos + taps] = s->dither.ns_errors[ch][pos] = d1 - d;
ns_errors[pos + taps] = ns_errors[pos] = d1 - d;
d1 *= S;
CLIP(d1);
dst[i] = d1;