From b0ba815514e714b680bddc45e4b77e2209036d05 Mon Sep 17 00:00:00 2001
From: Robbert van der Helm <mail@robbertvanderhelm.nl>
Date: Mon, 21 Mar 2022 19:17:41 +0100
Subject: [PATCH] Fix -inf in gain to Db conversion

---
 src/util.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/util.rs b/src/util.rs
index 648f3ef1..17b3e295 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -6,6 +6,7 @@ pub mod window;
 pub use stft::StftHelper;
 
 pub const MINUS_INFINITY_DB: f32 = -100.0;
+pub const MINUS_INFINITY_GAIN: f32 = 1e-5; // 10f32.powf(MINUS_INFINITY_DB / 20)
 pub const NOTES: [&str; 12] = [
     "C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B",
 ];
@@ -36,7 +37,7 @@ pub fn db_to_gain(dbs: f32) -> f32 {
 /// Convert a voltage gain ratio to decibels. Gain ratios that aren't positive will be treated as
 /// [`MINUS_INFINITY_DB`].
 pub fn gain_to_db(gain: f32) -> f32 {
-    if gain > 0.0 {
+    if gain > MINUS_INFINITY_GAIN {
         gain.log10() * 20.0
     } else {
         MINUS_INFINITY_DB