AAC: minor simplification in PNS decoding

Originally committed as revision 19999 to svn://svn.ffmpeg.org/ffmpeg/trunk
15 years ago · b418a6ca7e
parent a27090208e
commit b418a6ca7e
1 changed files with 4 additions and 4 deletions
--- a/libavcodec/aac.c
+++ b/libavcodec/aac.c
@ -860,16 +860,16 @@ static int decode_spectrum_and_dequant(AACContext *ac, float coef[1024],
            } else if (cur_band_type == NOISE_BT) {
                for (group = 0; group < ics->group_len[g]; group++) {
                    float scale;
-                    float band_energy = 0;
+                    float band_energy;
                    float *cf = coef + group * 128 + 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);
-                        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);
                    ac->dsp.vector_fmul_scalar(cf, cf, scale, len);
                }