From 40c19a9085acaddec8104f837e822b1c05831e7f Mon Sep 17 00:00:00 2001
From: "Herman S." <429230+has207@users.noreply.github.com>
Date: Mon, 3 Nov 2025 14:38:58 +0900
Subject: [PATCH] [XMA] Added SignalWork calls in XMASetInputBuffer{0,1}Valid

This should wake up the XMA decoder worker thread when new audio data is
provided instead of only when the contexts are initially enabled or
decoder is shutting down.
---
 src/xenia/apu/xma_decoder.h                     |  6 ++++++
 src/xenia/kernel/xboxkrnl/xboxkrnl_audio_xma.cc | 12 ++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/src/xenia/apu/xma_decoder.h b/src/xenia/apu/xma_decoder.h
index 753ebe703..ac9453a88 100644
--- a/src/xenia/apu/xma_decoder.h
+++ b/src/xenia/apu/xma_decoder.h
@@ -51,6 +51,12 @@ class XmaDecoder {
   void Pause();
   void Resume();
 
+  void SignalWork() {
+    if (work_event_) {
+      work_event_->Set();
+    }
+  }
+
  protected:
   int GetContextId(uint32_t guest_ptr);
 
diff --git a/src/xenia/kernel/xboxkrnl/xboxkrnl_audio_xma.cc b/src/xenia/kernel/xboxkrnl/xboxkrnl_audio_xma.cc
index b529ffc41..dbd07cf54 100644
--- a/src/xenia/kernel/xboxkrnl/xboxkrnl_audio_xma.cc
+++ b/src/xenia/kernel/xboxkrnl/xboxkrnl_audio_xma.cc
@@ -260,6 +260,12 @@ dword_result_t XMASetInputBuffer0Valid_entry(lpvoid_t context_ptr) {
   context.input_buffer_0_valid = 1;
   context.Store(context_ptr);
 
+  // Wake up the worker thread so it can process the new input data.
+  auto audio_system = kernel_state()->emulator()->audio_system();
+  if (audio_system) {
+    audio_system->xma_decoder()->SignalWork();
+  }
+
   return 0;
 }
 DECLARE_XBOXKRNL_EXPORT2(XMASetInputBuffer0Valid, kAudio, kImplemented,
@@ -301,6 +307,12 @@ dword_result_t XMASetInputBuffer1Valid_entry(lpvoid_t context_ptr) {
   context.input_buffer_1_valid = 1;
   context.Store(context_ptr);
 
+  // Wake up the worker thread so it can process the new input data.
+  auto audio_system = kernel_state()->emulator()->audio_system();
+  if (audio_system) {
+    audio_system->xma_decoder()->SignalWork();
+  }
+
   return 0;
 }
 DECLARE_XBOXKRNL_EXPORT2(XMASetInputBuffer1Valid, kAudio, kImplemented,