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Code Issues Releases Activity

AAC: minor simplification in PNS decoding

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Originally committed as revision 19999 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Måns Rullgård 2009-09-23 13:52:53 +00:00
parent a27090208e
commit b418a6ca7e
1 changed files with 4 additions and 4 deletions
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8
libavcodec/aac.c
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@ -860,16 +860,16 @@ static int decode_spectrum_and_dequant(AACContext *ac, float coef[1024],
} else if (cur_band_type == NOISE_BT) { } else if (cur_band_type == NOISE_BT) {
for (group = 0; group < ics->group_len[g]; group++) { for (group = 0; group < ics->group_len[g]; group++) {
float scale; float scale;
float band_energy = 0; float band_energy;
float *cf = coef + group * 128 + offsets[i]; float *cf = coef + group * 128 + offsets[i];
int len = offsets[i+1] - offsets[i]; int len = offsets[i+1] - offsets[i];
for (k = offsets[i]; k < offsets[i + 1]; k++) { for (k = 0; k < len; k++) {
ac->random_state = lcg_random(ac->random_state); ac->random_state = lcg_random(ac->random_state);
coef[group * 128 + k] = ac->random_state; cf[k] = ac->random_state;
} }
band_energy += ac->dsp.scalarproduct_float(cf, cf, len); band_energy = ac->dsp.scalarproduct_float(cf, cf, len);
scale = sf[idx] / sqrtf(band_energy); scale = sf[idx] / sqrtf(band_energy);
ac->dsp.vector_fmul_scalar(cf, cf, scale, len); ac->dsp.vector_fmul_scalar(cf, cf, scale, len);
} }