aacenc: use the decoder's lcg PRNG

Using lfg was an overkill in this case where the random numbers
were only used for encoder descisions. Should increase result
uniformity between different FPUs and gives a slight speedup.

Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>

1 files changed, 3 insertions, 5 deletions

diff --git a/libavcodec/aaccoder.c b/libavcodec/aaccoder.c
index 284b401..35787e8 100644
--- a/libavcodec/aaccoder.c
+++ b/libavcodec/aaccoder.c
@@ -643,11 +643,9 @@ static void search_for_pns(AACEncContext *s, AVCodecContext *avctx, SingleChanne
                 float band_energy, scale, pns_senergy;
                 const int start_c = (w+w2)*128+sce->ics.swb_offset[g];
                 band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
-                for (i = 0; i < sce->ics.swb_sizes[g]; i+=2) {
-                    double rnd[2];
-                    av_bmg_get(&s->lfg, rnd);
-                    PNS[i+0] = (float)rnd[0];
-                    PNS[i+1] = (float)rnd[1];
+                for (i = 0; i < sce->ics.swb_sizes[g]; i++) {
+                    s->random_state  = lcg_random(s->random_state);
+                    PNS[i] = s->random_state;
                 }
                 band_energy = s->fdsp->scalarproduct_float(PNS, PNS, sce->ics.swb_sizes[g]);
                 scale = noise_amp/sqrtf(band_energy);