8 files changed, 384 insertions, 118 deletions

diff --git a/src/audio_core/adsp/adsp.cpp b/src/audio_core/adsp/adsp.cpp
new file mode 100644
index 000000000..0580990f5
--- /dev/null
+++ b/src/audio_core/adsp/adsp.cpp
@@ -0,0 +1,18 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "audio_core/adsp/adsp.h"
+#include "core/core.h"
+
+namespace AudioCore::ADSP {
+
+ADSP::ADSP(Core::System& system, Sink::Sink& sink) {
+    audio_renderer =
+        std::make_unique<AudioRenderer::AudioRenderer>(system, system.ApplicationMemory(), sink);
+}
+
+AudioRenderer::AudioRenderer& ADSP::AudioRenderer() {
+    return *audio_renderer.get();
+}
+
+} // namespace AudioCore::ADSP
diff --git a/src/audio_core/adsp/adsp.h b/src/audio_core/adsp/adsp.h
new file mode 100644
index 000000000..bd5bcc63b
--- /dev/null
+++ b/src/audio_core/adsp/adsp.h
@@ -0,0 +1,50 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "audio_core/adsp/apps/audio_renderer/audio_renderer.h"
+#include "common/common_types.h"
+
+namespace Core {
+class System;
+} // namespace Core
+
+namespace AudioCore {
+namespace Sink {
+class Sink;
+}
+
+namespace ADSP {
+
+/**
+ * Represents the ADSP embedded within the audio sysmodule.
+ * This is a 32-bit Linux4Tegra kernel from nVidia, which is launched with the sysmodule on boot.
+ *
+ * The kernel will run the apps you write for it, Nintendo have the following:
+ *
+ * Gmix - Responsible for mixing final audio and sending it out to hardware. This is last place all
+ *        audio samples end up, and we skip it entirely, since we have very different backends and
+ *        mixing is implicitly handled by the OS (but also due to lack of research/simplicity).
+ *
+ * AudioRenderer - Receives command lists generated by the audio render
+ *                 system on the host, processes them, and sends the samples to Gmix.
+ *
+ * OpusDecoder - Contains libopus, and decodes Opus audio packets into raw pcm data.
+ *
+ * Communication between the host and ADSP is done through mailboxes, and mapping of shared memory.
+ */
+class ADSP {
+public:
+    explicit ADSP(Core::System& system, Sink::Sink& sink);
+    ~ADSP() = default;
+
+    AudioRenderer::AudioRenderer& AudioRenderer();
+
+private:
+    /// AudioRenderer app
+    std::unique_ptr<AudioRenderer::AudioRenderer> audio_renderer{};
+};
+
+} // namespace ADSP
+} // namespace AudioCore
diff --git a/src/audio_core/renderer/adsp/audio_renderer.cpp b/src/audio_core/adsp/apps/audio_renderer/audio_renderer.cpp
index 9ca716b60..3da342ea3 100644
--- a/src/audio_core/renderer/adsp/audio_renderer.cpp
+++ b/src/audio_core/adsp/apps/audio_renderer/audio_renderer.cpp
@@ -1,12 +1,12 @@
-// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #include <array>
 #include <chrono>
 
+#include "audio_core/adsp/apps/audio_renderer/audio_renderer.h"
 #include "audio_core/audio_core.h"
 #include "audio_core/common/common.h"
-#include "audio_core/renderer/adsp/audio_renderer.h"
 #include "audio_core/sink/sink.h"
 #include "common/logging/log.h"
 #include "common/microprofile.h"
@@ -16,108 +16,92 @@
 
 MICROPROFILE_DEFINE(Audio_Renderer, "Audio", "DSP", MP_RGB(60, 19, 97));
 
-namespace AudioCore::AudioRenderer::ADSP {
+namespace AudioCore::ADSP::AudioRenderer {
 
-void AudioRenderer_Mailbox::HostSendMessage(RenderMessage message_) {
-    adsp_messages.enqueue(message_);
-    adsp_event.Set();
-}
+AudioRenderer::AudioRenderer(Core::System& system_, Core::Memory::Memory& memory_,
+                             Sink::Sink& sink_)
+    : system{system_}, memory{memory_}, sink{sink_} {}
 
-RenderMessage AudioRenderer_Mailbox::HostWaitMessage() {
-    host_event.Wait();
-    RenderMessage msg{RenderMessage::Invalid};
-    if (!host_messages.try_dequeue(msg)) {
-        LOG_ERROR(Service_Audio, "Failed to dequeue host message!");
-    }
-    return msg;
+AudioRenderer::~AudioRenderer() {
+    Stop();
 }
 
-void AudioRenderer_Mailbox::ADSPSendMessage(const RenderMessage message_) {
-    host_messages.enqueue(message_);
-    host_event.Set();
-}
+void AudioRenderer::Start() {
+    CreateSinkStreams();
 
-RenderMessage AudioRenderer_Mailbox::ADSPWaitMessage() {
-    adsp_event.Wait();
-    RenderMessage msg{RenderMessage::Invalid};
-    if (!adsp_messages.try_dequeue(msg)) {
-        LOG_ERROR(Service_Audio, "Failed to dequeue ADSP message!");
-    }
-    return msg;
-}
+    mailbox.Initialize(AppMailboxId::AudioRenderer);
 
-CommandBuffer& AudioRenderer_Mailbox::GetCommandBuffer(const u32 session_id) {
-    return command_buffers[session_id];
-}
+    main_thread = std::jthread([this](std::stop_token stop_token) { Main(stop_token); });
 
-void AudioRenderer_Mailbox::SetCommandBuffer(const u32 session_id, const CommandBuffer& buffer) {
-    command_buffers[session_id] = buffer;
+    mailbox.Send(Direction::DSP, {Message::InitializeOK, {}});
+    if (mailbox.Receive(Direction::Host).msg != Message::InitializeOK) {
+        LOG_ERROR(Service_Audio, "Host Audio Renderer -- Failed to receive shutdown "
+                                 "message response from ADSP!");
+        return;
+    }
+    running = true;
 }
 
-u64 AudioRenderer_Mailbox::GetRenderTimeTaken() const {
-    return command_buffers[0].render_time_taken + command_buffers[1].render_time_taken;
-}
+void AudioRenderer::Stop() {
+    if (!running) {
+        return;
+    }
 
-u64 AudioRenderer_Mailbox::GetSignalledTick() const {
-    return signalled_tick;
-}
+    mailbox.Send(Direction::DSP, {Message::Shutdown, {}});
+    if (mailbox.Receive(Direction::Host).msg != Message::Shutdown) {
+        LOG_ERROR(Service_Audio, "Host Audio Renderer -- Failed to receive shutdown "
+                                 "message response from ADSP!");
+    }
+    main_thread.request_stop();
+    main_thread.join();
 
-void AudioRenderer_Mailbox::SetSignalledTick(const u64 tick) {
-    signalled_tick = tick;
+    for (auto& stream : streams) {
+        if (stream) {
+            stream->Stop();
+            sink.CloseStream(stream);
+            stream = nullptr;
+        }
+    }
+    running = false;
 }
 
-void AudioRenderer_Mailbox::ClearRemainCount(const u32 session_id) {
-    command_buffers[session_id].remaining_command_count = 0;
+void AudioRenderer::Signal() {
+    signalled_tick = system.CoreTiming().GetGlobalTimeNs().count();
+    Send(Direction::DSP, {Message::Render, {}});
 }
 
-u32 AudioRenderer_Mailbox::GetRemainCommandCount(const u32 session_id) const {
-    return command_buffers[session_id].remaining_command_count;
+void AudioRenderer::Wait() {
+    auto received = Receive(Direction::Host);
+    if (received.msg != Message::RenderResponse) {
+        LOG_ERROR(Service_Audio,
+                  "Did not receive the expected render response from the AudioRenderer! Expected "
+                  "{}, got {}",
+                  Message::RenderResponse, received.msg);
+    }
 }
 
-void AudioRenderer_Mailbox::ClearCommandBuffers() {
-    command_buffers[0].buffer = 0;
-    command_buffers[0].size = 0;
-    command_buffers[0].reset_buffers = false;
-    command_buffers[1].buffer = 0;
-    command_buffers[1].size = 0;
-    command_buffers[1].reset_buffers = false;
+void AudioRenderer::Send(Direction dir, MailboxMessage message) {
+    mailbox.Send(dir, std::move(message));
 }
 
-AudioRenderer::AudioRenderer(Core::System& system_)
-    : system{system_}, sink{system.AudioCore().GetOutputSink()} {
-    CreateSinkStreams();
+MailboxMessage AudioRenderer::Receive(Direction dir, bool block) {
+    return mailbox.Receive(dir, block);
 }
 
-AudioRenderer::~AudioRenderer() {
-    Stop();
-    for (auto& stream : streams) {
-        if (stream) {
-            sink.CloseStream(stream);
-        }
-        stream = nullptr;
-    }
+void AudioRenderer::SetCommandBuffer(s32 session_id, CommandBuffer& buffer) noexcept {
+    command_buffers[session_id] = buffer;
 }
 
-void AudioRenderer::Start(AudioRenderer_Mailbox* mailbox_) {
-    if (running) {
-        return;
-    }
-
-    mailbox = mailbox_;
-    thread = std::jthread([this](std::stop_token stop_token) { ThreadFunc(stop_token); });
-    running = true;
+u32 AudioRenderer::GetRemainCommandCount(s32 session_id) const noexcept {
+    return command_buffers[session_id].remaining_command_count;
 }
 
-void AudioRenderer::Stop() {
-    if (!running) {
-        return;
-    }
+void AudioRenderer::ClearRemainCommandCount(s32 session_id) noexcept {
+    command_buffers[session_id].remaining_command_count = 0;
+}
 
-    for (auto& stream : streams) {
-        stream->Stop();
-    }
-    thread.join();
-    running = false;
+u64 AudioRenderer::GetRenderingStartTick(s32 session_id) const noexcept {
+    return (1000 * command_buffers[session_id].render_time_taken_us) + signalled_tick;
 }
 
 void AudioRenderer::CreateSinkStreams() {
@@ -130,41 +114,45 @@ void AudioRenderer::CreateSinkStreams() {
     }
 }
 
-void AudioRenderer::ThreadFunc(std::stop_token stop_token) {
+void AudioRenderer::Main(std::stop_token stop_token) {
     static constexpr char name[]{"AudioRenderer"};
     MicroProfileOnThreadCreate(name);
     Common::SetCurrentThreadName(name);
     Common::SetCurrentThreadPriority(Common::ThreadPriority::High);
-    if (mailbox->ADSPWaitMessage() != RenderMessage::AudioRenderer_InitializeOK) {
+
+    // TODO: Create buffer map/unmap thread + mailbox
+    // TODO: Create gMix devices, initialize them here
+
+    if (mailbox.Receive(Direction::DSP).msg != Message::InitializeOK) {
         LOG_ERROR(Service_Audio,
                   "ADSP Audio Renderer -- Failed to receive initialize message from host!");
         return;
     }
 
-    mailbox->ADSPSendMessage(RenderMessage::AudioRenderer_InitializeOK);
+    mailbox.Send(Direction::Host, {Message::InitializeOK, {}});
 
-    // 0.12 seconds (2304000 / 19200000)
+    // 0.12 seconds (2,304,000 / 19,200,000)
     constexpr u64 max_process_time{2'304'000ULL};
 
     while (!stop_token.stop_requested()) {
-        auto message{mailbox->ADSPWaitMessage()};
-        switch (message) {
-        case RenderMessage::AudioRenderer_Shutdown:
-            mailbox->ADSPSendMessage(RenderMessage::AudioRenderer_Shutdown);
+        auto received{mailbox.Receive(Direction::DSP)};
+        switch (received.msg) {
+        case Message::Shutdown:
+            mailbox.Send(Direction::Host, {Message::Shutdown, {}});
             return;
 
-        case RenderMessage::AudioRenderer_Render: {
+        case Message::Render: {
             if (system.IsShuttingDown()) [[unlikely]] {
                 std::this_thread::sleep_for(std::chrono::milliseconds(5));
-                mailbox->ADSPSendMessage(RenderMessage::AudioRenderer_RenderResponse);
+                mailbox.Send(Direction::Host, {Message::RenderResponse, {}});
                 continue;
             }
             std::array<bool, MaxRendererSessions> buffers_reset{};
             std::array<u64, MaxRendererSessions> render_times_taken{};
-            const auto start_time{system.CoreTiming().GetClockTicks()};
+            const auto start_time{system.CoreTiming().GetGlobalTimeUs().count()};
 
-            for (u32 index = 0; index < 2; index++) {
-                auto& command_buffer{mailbox->GetCommandBuffer(index)};
+            for (u32 index = 0; index < MaxRendererSessions; index++) {
+                auto& command_buffer{command_buffers[index]};
                 auto& command_list_processor{command_list_processors[index]};
 
                 // Check this buffer is valid, as it may not be used.
@@ -176,14 +164,14 @@ void AudioRenderer::ThreadFunc(std::stop_token stop_token) {
                                                           command_buffer.size, streams[index]);
                     }
 
-                    if (command_buffer.reset_buffers && !buffers_reset[index]) {
+                    if (command_buffer.reset_buffer && !buffers_reset[index]) {
                         streams[index]->ClearQueue();
                         buffers_reset[index] = true;
                     }
 
                     u64 max_time{max_process_time};
                     if (index == 1 && command_buffer.applet_resource_user_id ==
-                                          mailbox->GetCommandBuffer(0).applet_resource_user_id) {
+                                          command_buffers[0].applet_resource_user_id) {
                         max_time = max_process_time - render_times_taken[0];
                         if (render_times_taken[0] > max_process_time) {
                             max_time = 0;
@@ -193,7 +181,9 @@ void AudioRenderer::ThreadFunc(std::stop_token stop_token) {
                     max_time = std::min(command_buffer.time_limit, max_time);
                     command_list_processor.SetProcessTimeMax(max_time);
 
-                    streams[index]->WaitFreeSpace(stop_token);
+                    if (index == 0) {
+                        streams[index]->WaitFreeSpace(stop_token);
+                    }
 
                     // Process the command list
                     {
@@ -202,24 +192,24 @@ void AudioRenderer::ThreadFunc(std::stop_token stop_token) {
                             command_list_processor.Process(index) - start_time;
                     }
 
-                    const auto end_time{system.CoreTiming().GetClockTicks()};
+                    const auto end_time{system.CoreTiming().GetGlobalTimeUs().count()};
 
                     command_buffer.remaining_command_count =
                         command_list_processor.GetRemainingCommandCount();
-                    command_buffer.render_time_taken = end_time - start_time;
+                    command_buffer.render_time_taken_us = end_time - start_time;
                 }
             }
 
-            mailbox->ADSPSendMessage(RenderMessage::AudioRenderer_RenderResponse);
+            mailbox.Send(Direction::Host, {Message::RenderResponse, {}});
         } break;
 
         default:
             LOG_WARNING(Service_Audio,
                         "ADSP AudioRenderer received an invalid message, msg={:02X}!",
-                        static_cast<u32>(message));
+                        received.msg);
             break;
         }
     }
 }
 
-} // namespace AudioCore::AudioRenderer::ADSP
+} // namespace AudioCore::ADSP::AudioRenderer
diff --git a/src/audio_core/adsp/apps/audio_renderer/audio_renderer.h b/src/audio_core/adsp/apps/audio_renderer/audio_renderer.h
new file mode 100644
index 000000000..b225e10fb
--- /dev/null
+++ b/src/audio_core/adsp/apps/audio_renderer/audio_renderer.h
@@ -0,0 +1,115 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <array>
+#include <memory>
+#include <thread>
+
+#include "audio_core/adsp/apps/audio_renderer/command_buffer.h"
+#include "audio_core/adsp/apps/audio_renderer/command_list_processor.h"
+#include "audio_core/adsp/mailbox.h"
+#include "common/common_types.h"
+#include "common/polyfill_thread.h"
+#include "common/reader_writer_queue.h"
+#include "common/thread.h"
+
+namespace Core {
+class System;
+namespace Timing {
+struct EventType;
+}
+namespace Memory {
+class Memory;
+}
+class System;
+} // namespace Core
+
+namespace AudioCore {
+namespace Sink {
+class Sink;
+}
+
+namespace ADSP::AudioRenderer {
+
+enum Message : u32 {
+    Invalid = 0x00,
+    MapUnmap_Map = 0x01,
+    MapUnmap_MapResponse = 0x02,
+    MapUnmap_Unmap = 0x03,
+    MapUnmap_UnmapResponse = 0x04,
+    MapUnmap_InvalidateCache = 0x05,
+    MapUnmap_InvalidateCacheResponse = 0x06,
+    MapUnmap_Shutdown = 0x07,
+    MapUnmap_ShutdownResponse = 0x08,
+    InitializeOK = 0x16,
+    RenderResponse = 0x20,
+    Render = 0x2A,
+    Shutdown = 0x34,
+};
+
+/**
+ * The AudioRenderer application running on the ADSP.
+ */
+class AudioRenderer {
+public:
+    explicit AudioRenderer(Core::System& system, Core::Memory::Memory& memory, Sink::Sink& sink);
+    ~AudioRenderer();
+
+    /**
+     * Start the AudioRenderer.
+     *
+     * @param mailbox The mailbox to use for this session.
+     */
+    void Start();
+
+    /**
+     * Stop the AudioRenderer.
+     */
+    void Stop();
+
+    void Signal();
+    void Wait();
+
+    void Send(Direction dir, MailboxMessage message);
+    MailboxMessage Receive(Direction dir, bool block = true);
+
+    void SetCommandBuffer(s32 session_id, CommandBuffer& buffer) noexcept;
+    u32 GetRemainCommandCount(s32 session_id) const noexcept;
+    void ClearRemainCommandCount(s32 session_id) noexcept;
+    u64 GetRenderingStartTick(s32 session_id) const noexcept;
+
+private:
+    /**
+     * Main AudioRenderer thread, responsible for processing the command lists.
+     */
+    void Main(std::stop_token stop_token);
+
+    /**
+     * Creates the streams which will receive the processed samples.
+     */
+    void CreateSinkStreams();
+
+    /// Core system
+    Core::System& system;
+    /// Memory
+    Core::Memory::Memory& memory;
+    /// The output sink the AudioRenderer will use
+    Sink::Sink& sink;
+    /// The active mailbox
+    Mailbox mailbox;
+    /// Main thread
+    std::jthread main_thread{};
+    /// The current state
+    std::atomic<bool> running{};
+    std::array<CommandBuffer, MaxRendererSessions> command_buffers{};
+    /// The command lists to process
+    std::array<CommandListProcessor, MaxRendererSessions> command_list_processors{};
+    /// The streams which will receive the processed samples
+    std::array<Sink::SinkStream*, MaxRendererSessions> streams{};
+    u64 signalled_tick{0};
+};
+
+} // namespace ADSP::AudioRenderer
+} // namespace AudioCore
diff --git a/src/audio_core/adsp/apps/audio_renderer/command_buffer.h b/src/audio_core/adsp/apps/audio_renderer/command_buffer.h
new file mode 100644
index 000000000..3fd1b09dc
--- /dev/null
+++ b/src/audio_core/adsp/apps/audio_renderer/command_buffer.h
@@ -0,0 +1,23 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "audio_core/common/common.h"
+#include "common/common_types.h"
+
+namespace AudioCore::ADSP::AudioRenderer {
+
+struct CommandBuffer {
+    // Set by the host
+    CpuAddr buffer{};
+    u64 size{};
+    u64 time_limit{};
+    u64 applet_resource_user_id{};
+    bool reset_buffer{};
+    // Set by the DSP
+    u32 remaining_command_count{};
+    u64 render_time_taken_us{};
+};
+
+} // namespace AudioCore::ADSP::AudioRenderer
diff --git a/src/audio_core/renderer/adsp/command_list_processor.cpp b/src/audio_core/adsp/apps/audio_renderer/command_list_processor.cpp
index 3a0f1ae38..acbc9100c 100644
--- a/src/audio_core/renderer/adsp/command_list_processor.cpp
+++ b/src/audio_core/adsp/apps/audio_renderer/command_list_processor.cpp
@@ -1,9 +1,9 @@
-// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #include <string>
 
-#include "audio_core/renderer/adsp/command_list_processor.h"
+#include "audio_core/adsp/apps/audio_renderer/command_list_processor.h"
 #include "audio_core/renderer/command/command_list_header.h"
 #include "audio_core/renderer/command/commands.h"
 #include "common/settings.h"
@@ -11,15 +11,15 @@
 #include "core/core_timing.h"
 #include "core/memory.h"
 
-namespace AudioCore::AudioRenderer::ADSP {
+namespace AudioCore::ADSP::AudioRenderer {
 
 void CommandListProcessor::Initialize(Core::System& system_, CpuAddr buffer, u64 size,
                                       Sink::SinkStream* stream_) {
     system = &system_;
     memory = &system->ApplicationMemory();
     stream = stream_;
-    header = reinterpret_cast<CommandListHeader*>(buffer);
-    commands = reinterpret_cast<u8*>(buffer + sizeof(CommandListHeader));
+    header = reinterpret_cast<Renderer::CommandListHeader*>(buffer);
+    commands = reinterpret_cast<u8*>(buffer + sizeof(Renderer::CommandListHeader));
     commands_buffer_size = size;
     command_count = header->command_count;
     sample_count = header->sample_count;
@@ -38,7 +38,7 @@ u32 CommandListProcessor::GetRemainingCommandCount() const {
 }
 
 void CommandListProcessor::SetBuffer(const CpuAddr buffer, const u64 size) {
-    commands = reinterpret_cast<u8*>(buffer + sizeof(CommandListHeader));
+    commands = reinterpret_cast<u8*>(buffer + sizeof(Renderer::CommandListHeader));
     commands_buffer_size = size;
 }
 
@@ -47,7 +47,7 @@ Sink::SinkStream* CommandListProcessor::GetOutputSinkStream() const {
 }
 
 u64 CommandListProcessor::Process(u32 session_id) {
-    const auto start_time_{system->CoreTiming().GetClockTicks()};
+    const auto start_time_{system->CoreTiming().GetGlobalTimeUs().count()};
     const auto command_base{CpuAddr(commands)};
 
     if (processed_command_count > 0) {
@@ -60,12 +60,12 @@ u64 CommandListProcessor::Process(u32 session_id) {
     std::string dump{fmt::format("\nSession {}\n", session_id)};
 
     for (u32 index = 0; index < command_count; index++) {
-        auto& command{*reinterpret_cast<ICommand*>(commands)};
+        auto& command{*reinterpret_cast<Renderer::ICommand*>(commands)};
 
         if (command.magic != 0xCAFEBABE) {
             LOG_ERROR(Service_Audio, "Command has invalid magic! Expected 0xCAFEBABE, got {:08X}",
                       command.magic);
-            return system->CoreTiming().GetClockTicks() - start_time_;
+            return system->CoreTiming().GetGlobalTimeUs().count() - start_time_;
         }
 
         auto current_offset{CpuAddr(commands) - command_base};
@@ -74,8 +74,8 @@ u64 CommandListProcessor::Process(u32 session_id) {
             LOG_ERROR(Service_Audio,
                       "Command exceeded command buffer, buffer size {:08X}, command ends at {:08X}",
                       commands_buffer_size,
-                      CpuAddr(commands) + command.size - sizeof(CommandListHeader));
-            return system->CoreTiming().GetClockTicks() - start_time_;
+                      CpuAddr(commands) + command.size - sizeof(Renderer::CommandListHeader));
+            return system->CoreTiming().GetGlobalTimeUs().count() - start_time_;
         }
 
         if (Settings::values.dump_audio_commands) {
@@ -101,8 +101,8 @@ u64 CommandListProcessor::Process(u32 session_id) {
         last_dump = dump;
     }
 
-    end_time = system->CoreTiming().GetClockTicks();
+    end_time = system->CoreTiming().GetGlobalTimeUs().count();
     return end_time - start_time_;
 }
 
-} // namespace AudioCore::AudioRenderer::ADSP
+} // namespace AudioCore::ADSP::AudioRenderer
diff --git a/src/audio_core/renderer/adsp/command_list_processor.h b/src/audio_core/adsp/apps/audio_renderer/command_list_processor.h
index d78269e1d..9d6fe1851 100644
--- a/src/audio_core/renderer/adsp/command_list_processor.h
+++ b/src/audio_core/adsp/apps/audio_renderer/command_list_processor.h
@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #pragma once
@@ -6,6 +6,7 @@
 #include <span>
 
 #include "audio_core/common/common.h"
+#include "audio_core/renderer/command/command_list_header.h"
 #include "common/common_types.h"
 
 namespace Core {
@@ -20,10 +21,11 @@ namespace Sink {
 class SinkStream;
 }
 
-namespace AudioRenderer {
+namespace Renderer {
 struct CommandListHeader;
+}
 
-namespace ADSP {
+namespace ADSP::AudioRenderer {
 
 /**
  * A processor for command lists given to the AudioRenderer.
@@ -85,7 +87,7 @@ public:
     /// Stream for the processed samples
     Sink::SinkStream* stream{};
     /// Header info for this command list
-    CommandListHeader* header{};
+    Renderer::CommandListHeader* header{};
     /// The command buffer
     u8* commands{};
     /// The command buffer size
@@ -114,6 +116,5 @@ public:
     std::string last_dump{};
 };
 
-} // namespace ADSP
-} // namespace AudioRenderer
+} // namespace ADSP::AudioRenderer
 } // namespace AudioCore
diff --git a/src/audio_core/adsp/mailbox.h b/src/audio_core/adsp/mailbox.h
new file mode 100644
index 000000000..c31b73717
--- /dev/null
+++ b/src/audio_core/adsp/mailbox.h
@@ -0,0 +1,69 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "common/bounded_threadsafe_queue.h"
+#include "common/common_types.h"
+
+namespace AudioCore::ADSP {
+
+enum class AppMailboxId : u32 {
+    Invalid = 0,
+    AudioRenderer = 50,
+    AudioRendererMemoryMapUnmap = 51,
+};
+
+enum class Direction : u32 {
+    Host,
+    DSP,
+};
+
+struct MailboxMessage {
+    u32 msg;
+    std::span<u8> data;
+};
+
+class Mailbox {
+public:
+    void Initialize(AppMailboxId id_) {
+        Reset();
+        id = id_;
+    }
+
+    AppMailboxId Id() const noexcept {
+        return id;
+    }
+
+    void Send(Direction dir, MailboxMessage&& message) {
+        auto& queue = dir == Direction::Host ? host_queue : adsp_queue;
+        queue.EmplaceWait(std::move(message));
+    }
+
+    MailboxMessage Receive(Direction dir, bool block = true) {
+        auto& queue = dir == Direction::Host ? host_queue : adsp_queue;
+        MailboxMessage t;
+        if (block) {
+            queue.PopWait(t);
+        } else {
+            queue.TryPop(t);
+        }
+        return t;
+    }
+
+    void Reset() {
+        id = AppMailboxId::Invalid;
+        MailboxMessage t;
+        while (host_queue.TryPop(t)) {
+        }
+        while (adsp_queue.TryPop(t)) {
+        }
+    }
+
+private:
+    AppMailboxId id{0};
+    Common::SPSCQueue<MailboxMessage> host_queue;
+    Common::SPSCQueue<MailboxMessage> adsp_queue;
+};
+
+} // namespace AudioCore::ADSP