From 8771cde5fc367f54db320824fd390bc4474abb7c Mon Sep 17 00:00:00 2001
From: FearlessTobi <thm.frey@gmail.com>
Date: Tue, 31 Mar 2020 01:58:00 +0200
Subject: [PATCH] audio_core: Add realtime audio

---
 src/audio_core/hle/hle.cpp     | 8 +++++++-
 src/core/core.cpp              | 4 ++++
 src/core/core.h                | 2 ++
 src/core/settings.cpp          | 1 +
 src/core/settings.h            | 1 +
 src/core/telemetry_session.cpp | 2 ++
 6 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/src/audio_core/hle/hle.cpp b/src/audio_core/hle/hle.cpp
index cba17c5ca..3185549ae 100644
--- a/src/audio_core/hle/hle.cpp
+++ b/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)
 
@@ -453,7 +455,11 @@ 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)) {}
diff --git a/src/core/core.cpp b/src/core/core.cpp
index 5f3fe8099..d08edbbdd 100644
--- a/src/core/core.cpp
+++ b/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;
diff --git a/src/core/core.h b/src/core/core.h
index e7fbd8ee3..dd23cb0ab 100644
--- a/src/core/core.h
+++ b/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.
diff --git a/src/core/settings.cpp b/src/core/settings.cpp
index bcac38ca5..caccf1623 100644
--- a/src/core/settings.cpp
+++ b/src/core/settings.cpp
@@ -107,6 +107,7 @@ void LogSettings() {
     log_setting("Audio_OutputDevice", values.audio_device_id);
     log_setting("Audio_InputDeviceType", static_cast<int>(values.mic_input_type));
     log_setting("Audio_InputDevice", values.mic_input_device);
+    log_setting("Audio_EnableRealTime", Settings::values.enable_realtime_audio);
     using namespace Service::CAM;
     log_setting("Camera_OuterRightName", values.camera_name[OuterRightCamera]);
     log_setting("Camera_OuterRightConfig", values.camera_config[OuterRightCamera]);
diff --git a/src/core/settings.h b/src/core/settings.h
index 6fa68a07c..d2e0f8781 100644
--- a/src/core/settings.h
+++ b/src/core/settings.h
@@ -202,6 +202,7 @@ 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;
diff --git a/src/core/telemetry_session.cpp b/src/core/telemetry_session.cpp
index 6189e84ee..f13543479 100644
--- a/src/core/telemetry_session.cpp
+++ b/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);