audren_u: Schedule reoccuring event.

src/core/hle/service/audio/audren_u.cpp

@@ -3,6 +3,7 @@
 // Refer to the license.txt file included.
 
 #include "common/logging/log.h"
+#include "core/core_timing.h"
 #include "core/hle/ipc_helpers.h"
 #include "core/hle/kernel/event.h"
 #include "core/hle/kernel/hle_ipc.h"
@@ -11,6 +12,9 @@
 namespace Service {
 namespace Audio {
 
+/// TODO(bunnei): Find a proper value for the audio_ticks
+constexpr u64 audio_ticks{static_cast<u64>(BASE_CLOCK_RATE / 500)};
+
 class IAudioRenderer final : public ServiceFramework<IAudioRenderer> {
 public:
     IAudioRenderer() : ServiceFramework("IAudioRenderer") {
@@ -30,10 +34,24 @@ public:
 
         system_event =
             Kernel::Event::Create(Kernel::ResetType::OneShot, "IAudioRenderer:SystemEvent");
+
+        // Register event callback to update the Audio Buffer
+        audio_event = CoreTiming::RegisterEvent(
+            "IAudioRenderer::UpdateAudioCallback", [this](u64 userdata, int cycles_late) {
+                UpdateAudioCallback();
+                CoreTiming::ScheduleEvent(audio_ticks - cycles_late, audio_event);
+            });
+
+        // Start the audio event
+        CoreTiming::ScheduleEvent(audio_ticks, audio_event);
     }
     ~IAudioRenderer() = default;
 
 private:
+    void UpdateAudioCallback() {
+        system_event->Signal();
+    }
+
     void RequestUpdateAudioRenderer(Kernel::HLERequestContext& ctx) {
         AudioRendererResponseData response_data = {0};
 
@@ -126,6 +144,9 @@ private:
     static_assert(sizeof(AudioRendererResponseData) == 0x20e0,
                   "AudioRendererResponseData has wrong size");
 
+    /// This is used to trigger the audio event callback.
+    CoreTiming::EventType* audio_event;
+
     Kernel::SharedPtr<Kernel::Event> system_event;
 };