audio_core: Add realtime audio

src/audio_core/hle/hle.cpp

@@ -17,6 +17,7 @@
 #elif HAVE_FDK
 #include "audio_core/hle/fdk_decoder.h"
 #endif
+#include <algorithm>
 #include "audio_core/hle/common.h"
 #include "audio_core/hle/decoder.h"
 #include "audio_core/hle/hle.h"
@@ -30,6 +31,7 @@
 #include "common/logging/log.h"
 #include "core/core.h"
 #include "core/core_timing.h"
+#include "core/settings.h"
 
 SERIALIZE_EXPORT_IMPL(AudioCore::DspHle)
 
@@ -448,7 +450,11 @@ void DspHle::Impl::AudioTickCallback(s64 cycles_late) {
 
     // Reschedule recurrent event
     Core::Timing& timing = Core::System::GetInstance().CoreTiming();
-    timing.ScheduleEvent(audio_frame_ticks - cycles_late, tick_event);
+    const double time_scale =
+        Settings::values.enable_realtime_audio
+            ? std::clamp(Core::System::GetInstance().GetLastFrameTimeScale(), 1.0, 3.0)
+            : 1.0;
+    timing.ScheduleEvent(audio_frame_ticks / time_scale - cycles_late, tick_event);
 }
 
 DspHle::DspHle(Memory::MemorySystem& memory) : impl(std::make_unique<Impl>(*this, memory)) {}

src/core/core.cpp

@@ -339,6 +339,10 @@ PerfStats::Results System::GetAndResetPerfStats() {
                                   : PerfStats::Results{};
 }
 
+double System::GetLastFrameTimeScale() {
+    return perf_stats->GetLastFrameTimeScale();
+}
+
 void System::Reschedule() {
     if (!reschedule_pending) {
         return;

src/core/core.h

@@ -168,6 +168,8 @@ public:
 
     PerfStats::Results GetAndResetPerfStats();
 
+    double GetLastFrameTimeScale();
+
     /**
      * Gets a reference to the emulated CPU.
      * @returns A reference to the emulated CPU.

src/core/settings.cpp

@@ -102,6 +102,7 @@ void LogSettings() {
     LogSetting("Audio_EnableDspLleMultithread", Settings::values.enable_dsp_lle_multithread);
     LogSetting("Audio_OutputEngine", Settings::values.sink_id);
     LogSetting("Audio_EnableAudioStretching", Settings::values.enable_audio_stretching);
+    LogSetting("Audio_EnableRealTime", Settings::values.enable_realtime_audio);
     LogSetting("Audio_OutputDevice", Settings::values.audio_device_id);
     LogSetting("Audio_InputDeviceType", static_cast<int>(Settings::values.mic_input_type));
     LogSetting("Audio_InputDevice", Settings::values.mic_input_device);

src/core/settings.h

@@ -193,6 +193,7 @@ struct Values {
     bool enable_dsp_lle_multithread;
     std::string sink_id;
     bool enable_audio_stretching;
+    bool enable_realtime_audio;
     std::string audio_device_id;
     float volume;
     MicInputType mic_input_type;

src/core/telemetry_session.cpp

@@ -162,6 +162,8 @@ void TelemetrySession::AddInitialInfo(Loader::AppLoader& app_loader) {
     AddField(Telemetry::FieldType::UserConfig, "Audio_SinkId", Settings::values.sink_id);
     AddField(Telemetry::FieldType::UserConfig, "Audio_EnableAudioStretching",
              Settings::values.enable_audio_stretching);
+    AddField(Telemetry::FieldType::UserConfig, "Audio_EnableRealTime",
+             Settings::values.enable_realtime_audio);
     AddField(Telemetry::FieldType::UserConfig, "Core_UseCpuJit", Settings::values.use_cpu_jit);
     AddField(Telemetry::FieldType::UserConfig, "Renderer_ResolutionFactor",
              Settings::values.resolution_factor);