From b86153c110251af9c9302af53acacac3e8812791 Mon Sep 17 00:00:00 2001
From: Tortuga veloz <danielcampora@outlook.es>
Date: Wed, 12 Mar 2025 14:20:33 +0100
Subject: [PATCH] Fix spectrogram.

---
 src/audio/audio_general.c | 14 ++++++++++----
 src/audio/audio_thread.c  |  2 +-
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/src/audio/audio_general.c b/src/audio/audio_general.c
index c54407a5..22f0f7c6 100644
--- a/src/audio/audio_general.c
+++ b/src/audio/audio_general.c
@@ -2251,7 +2251,7 @@ void Audio_AnalyzeFrequencies(f32* buffer0, f32* buffer1, s32 length, f32* buffe
     s32 size;
 
     size = 1 << length;
-    half = size >> 1;
+    half = size / 2;
 
     // Initialize buffer 2 if it is the wrong size for this calculation
     if (size != (s32) buffer2[0]) {
@@ -2335,9 +2335,15 @@ u8* Audio_UpdateFrequencyAnalysis(void) {
 
     Audio_ProcessPlaylist();
     // clang-format off
-    aiData = gAiBuffers[gCurAiBuffIndex];\
-    for(i3 = 0; i3 < 256; i3++) {\
-        sAudioAnalyzerData[i3] = *aiData++;
+    aiData = gAiBuffers[gCurAiBuffIndex];
+    int numChannels = GetNumAudioChannels();
+    for(i3 = 0; i3 < 256; i3++) {
+        sAudioAnalyzerData[i3] = *aiData;
+        if (i3 % 2 == 0) {
+            aiData++;
+        } else {
+            aiData += numChannels - 1;
+        }
     }
     // clang-format on
     Audio_AnalyzeFrequencies(sAudioAnalyzerData, sAnalyzerBuffer1, 8, sAnalyzerBuffer2);
diff --git a/src/audio/audio_thread.c b/src/audio/audio_thread.c
index 4853158b..09eaa2f8 100644
--- a/src/audio/audio_thread.c
+++ b/src/audio/audio_thread.c
@@ -82,7 +82,7 @@ void AudioThread_CreateNextAudioBuffer(s16* samples, u32 num_samples) {
     AudioSynth_Update(gCurAbiCmdBuffer, &abiCmdCount, samples, num_samples);
 
     // Spectrum Analyzer fix
-    memcpy(gAiBuffers[gCurAiBuffIndex], samples, num_samples * sizeof(s16));
+    memcpy(gAiBuffers[gCurAiBuffIndex], samples, GetNumAudioChannels() * num_samples * sizeof(s16));
 
     gAudioRandom = osGetCount() * (gAudioRandom + gAudioTaskCountQ);
 }