From ea917e77c2879204c3f4885ab33b600b34041aed Mon Sep 17 00:00:00 2001
From: Sour <mesenemu@gmail.com>
Date: Tue, 5 Nov 2024 18:19:54 +0900
Subject: [PATCH] SMS: Fixed crackling in audio in PAL mode

---
 Core/SMS/SmsConsole.cpp | 5 +++--
 Core/SMS/SmsPsg.cpp     | 9 +++++++++
 Core/SMS/SmsPsg.h       | 2 ++
 3 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/Core/SMS/SmsConsole.cpp b/Core/SMS/SmsConsole.cpp
index c332a718..3ae67e92 100644
--- a/Core/SMS/SmsConsole.cpp
+++ b/Core/SMS/SmsConsole.cpp
@@ -54,7 +54,7 @@ LoadRomResult SmsConsole::LoadRom(VirtualFile& romFile)
 			_romFormat = RomFormat::Sms;
 			_model = SmsModel::Sms;
 		}
-
+		
 		_vdp.reset(new SmsVdp());
 		_memoryManager.reset(new SmsMemoryManager());
 		_cpu.reset(new SmsCpu());
@@ -74,7 +74,7 @@ LoadRomResult SmsConsole::LoadRom(VirtualFile& romFile)
 		_memoryManager->Init(_emu, this, romData, biosRom, _vdp.get(), _controlManager.get(), _cart.get(), _psg.get(), _fmAudio.get());
 		_vdp->Init(_emu, this, _cpu.get(), _controlManager.get(), _memoryManager.get());
 		_cpu->Init(_emu, this, _memoryManager.get());
-		
+
 		UpdateRegion(true);
 
 		return LoadRomResult::Success;
@@ -186,6 +186,7 @@ void SmsConsole::UpdateRegion(bool forceUpdate)
 	if(_region != region || forceUpdate) {
 		_region = region;
 		_vdp->SetRegion(_model == SmsModel::GameGear ? ConsoleRegion::Ntsc : _region);
+		_psg->SetRegion(_model == SmsModel::GameGear ? ConsoleRegion::Ntsc : _region);
 	}
 }
 
diff --git a/Core/SMS/SmsPsg.cpp b/Core/SMS/SmsPsg.cpp
index da53404b..54014d9f 100644
--- a/Core/SMS/SmsPsg.cpp
+++ b/Core/SMS/SmsPsg.cpp
@@ -28,6 +28,15 @@ SmsPsg::SmsPsg(Emulator* emu, SmsConsole* console)
 	blip_set_rates(_rightChannel, _console->GetMasterClockRate(), SmsPsg::SampleRate);
 }
 
+void SmsPsg::SetRegion(ConsoleRegion region)
+{
+	blip_clear(_leftChannel);
+	blip_clear(_rightChannel);
+
+	blip_set_rates(_leftChannel, _console->GetMasterClockRate(), SmsPsg::SampleRate);
+	blip_set_rates(_rightChannel, _console->GetMasterClockRate(), SmsPsg::SampleRate);
+}
+
 void SmsPsg::RunNoise(SmsNoiseChannelState& noise)
 {
 	if(noise.Timer == 0 || --noise.Timer == 0) {
diff --git a/Core/SMS/SmsPsg.h b/Core/SMS/SmsPsg.h
index 2e8503f5..0fbb4068 100644
--- a/Core/SMS/SmsPsg.h
+++ b/Core/SMS/SmsPsg.h
@@ -35,6 +35,8 @@ public:
 
 	SmsPsgState& GetState() { return _state; }
 
+	void SetRegion(ConsoleRegion region);
+
 	void Run();
 	void PlayQueuedAudio();