From: Kostya Shishkov <kostya.shishkov@gmail.com>
Date: Sat, 21 Jun 2025 12:27:21 +0000 (+0200)
Subject: aac/sbr: fix noise band selection
X-Git-Url: https://git.nihav.org/?a=commitdiff_plain;h=2b0ee5290506b95fac2b7d818bbf32767d1200d5;p=nihav.git

aac/sbr: fix noise band selection
---

diff --git a/nihav-mpeg/src/codecs/aac/sbr/synth.rs b/nihav-mpeg/src/codecs/aac/sbr/synth.rs
index 42a5ba0..cc7cd5c 100644
--- a/nihav-mpeg/src/codecs/aac/sbr/synth.rs
+++ b/nihav-mpeg/src/codecs/aac/sbr/synth.rs
@@ -223,8 +223,9 @@ impl SBRChannel {
                     let cur_x = self.x[l][p];
                     let prev_x = self.x[l - 1][p];
                     let pprev_x = self.x[l - 2][p];
-                    let g_k = match state.f_noise[..state.num_noise_bands].binary_search(&k) {
-                            Ok(idx) | Err(idx) => idx.min(state.num_noise_bands - 1),
+                    let g_k = match state.f_noise[..state.num_noise_bands].binary_search(&(dst_k + k)) {
+                            Ok(idx) => idx,
+                            Err(idx) => (idx - 1).min(state.num_noise_bands - 1),
                         };
                     let bw_val = self.bw_array[g_k];
                     *dst = cur_x + a0[p] * prev_x.scale(bw_val) + a1[p] * pprev_x.scale(bw_val * bw_val);