From 14f8273e13bd94d5cd59f7102b5fd970af8dafd5 Mon Sep 17 00:00:00 2001
From: Eknous-P <ehovakimyan053@gmail.com>
Date: Wed, 5 Nov 2025 12:34:48 +0400
Subject: [PATCH] Revert "spectrum: store own channel count"

This reverts commit 6f501a91b24ebb544d2216fbbae219d0e64534f5.
---
 src/gui/gui.h        |  3 +--
 src/gui/spectrum.cpp | 10 +++++-----
 2 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/src/gui/gui.h b/src/gui/gui.h
index 96b34ec7a..92465b2e3 100644
--- a/src/gui/gui.h
+++ b/src/gui/gui.h
@@ -2770,7 +2770,7 @@ class FurnaceGUI {
   fftw_complex* tunerFFTOutBuf;
   fftw_plan tunerPlan;
   struct SpectrumSettings {
-    int bins, chans;
+    int bins;
     float xZoom, xOffset;
     float yOffset;
     fftw_plan plan[DIV_MAX_OUTPUTS];
@@ -2782,7 +2782,6 @@ class FurnaceGUI {
     bool showXGrid, showYGrid, showXScale, showYScale;
     SpectrumSettings():
       bins(4096),
-      chans(0),
       xZoom(1.0f),
       xOffset(0.0f),
       yOffset(0.0f),
diff --git a/src/gui/spectrum.cpp b/src/gui/spectrum.cpp
index baf283b75..1e4dfddb9 100644
--- a/src/gui/spectrum.cpp
+++ b/src/gui/spectrum.cpp
@@ -110,10 +110,10 @@ void FurnaceGUI::drawSpectrum() {
         prevPos=pos;
       }
     }
+    int chans=e->getAudioDescGot().outChans;
     if (spectrum.update) {
       spectrum.update=false;
       spectrum.running=true;
-      spectrum.chans=e->getAudioDescGot().outChans; // save our own channel count in case it changes at around line 157
       for (int i=0; i<DIV_MAX_OUTPUTS; i++) {
         if (spectrum.buffer[i]) {
           fftw_free(spectrum.buffer[i]);
@@ -132,7 +132,7 @@ void FurnaceGUI::drawSpectrum() {
           spectrum.plot[i]=NULL;
         }
       }
-      for (int i=0; i<(spectrum.mono?1:spectrum.chans); i++) {
+      for (int i=0; i<(spectrum.mono?1:chans); i++) {
         spectrum.buffer[i]=(fftw_complex*)fftw_malloc(sizeof(fftw_complex)*spectrum.bins);
         if (!spectrum.buffer[i]) spectrum.running=false;
         spectrum.in[i]=new double[spectrum.bins];
@@ -156,7 +156,7 @@ void FurnaceGUI::drawSpectrum() {
       if (spectrum.running) logV("spectrum ready!");
     }
     if (spectrum.running) {
-      for (int z=spectrum.mono?0:(spectrum.chans-1); z>=0; z--) {
+      for (int z=spectrum.mono?0:(chans-1); z>=0; z--) {
         // get buffer
         memset(spectrum.in[z],0,sizeof(double)*spectrum.bins);
         int needle=e->oscReadPos-spectrum.bins;
@@ -165,10 +165,10 @@ void FurnaceGUI::drawSpectrum() {
           int pos=(needle+j)&0x7fff;
           double sample=0.0;
           if (spectrum.mono) {
-            for (int i=0; i<spectrum.chans; i++) {
+            for (int i=0; i<chans; i++) {
               sample+=e->oscBuf[i][pos];
             }
-            sample/=spectrum.chans;
+            sample/=chans;
           } else {
             sample+=e->oscBuf[z][pos];
           }