28 files changed, 938 insertions, 114 deletions

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 85354f43e..a88551fbc 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -3,6 +3,7 @@ include_directories(.)
 
 add_subdirectory(common)
 add_subdirectory(core)
+add_subdirectory(audio_core)
 add_subdirectory(video_core)
 add_subdirectory(input_common)
 add_subdirectory(tests)
diff --git a/src/audio_core/CMakeLists.txt b/src/audio_core/CMakeLists.txt
new file mode 100644
index 000000000..f00a55994
--- /dev/null
+++ b/src/audio_core/CMakeLists.txt
@@ -0,0 +1,11 @@
+add_library(audio_core STATIC
+    audio_out.cpp
+    audio_out.h
+    buffer.h
+    stream.cpp
+    stream.h
+)
+
+create_target_directory_groups(audio_core)
+
+target_link_libraries(audio_core PUBLIC common core)
diff --git a/src/audio_core/audio_out.cpp b/src/audio_core/audio_out.cpp
new file mode 100644
index 000000000..6d418a05b
--- /dev/null
+++ b/src/audio_core/audio_out.cpp
@@ -0,0 +1,50 @@
+// Copyright 2018 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "audio_core/audio_out.h"
+#include "common/assert.h"
+#include "common/logging/log.h"
+
+namespace AudioCore {
+
+/// Returns the stream format from the specified number of channels
+static Stream::Format ChannelsToStreamFormat(int num_channels) {
+    switch (num_channels) {
+    case 1:
+        return Stream::Format::Mono16;
+    case 2:
+        return Stream::Format::Stereo16;
+    case 6:
+        return Stream::Format::Multi51Channel16;
+    }
+
+    LOG_CRITICAL(Audio, "Unimplemented num_channels={}", num_channels);
+    UNREACHABLE();
+    return {};
+}
+
+StreamPtr AudioOut::OpenStream(int sample_rate, int num_channels,
+                               Stream::ReleaseCallback&& release_callback) {
+    streams.push_back(std::make_shared<Stream>(sample_rate, ChannelsToStreamFormat(num_channels),
+                                               std::move(release_callback)));
+    return streams.back();
+}
+
+std::vector<u64> AudioOut::GetTagsAndReleaseBuffers(StreamPtr stream, size_t max_count) {
+    return stream->GetTagsAndReleaseBuffers(max_count);
+}
+
+void AudioOut::StartStream(StreamPtr stream) {
+    stream->Play();
+}
+
+void AudioOut::StopStream(StreamPtr stream) {
+    stream->Stop();
+}
+
+bool AudioOut::QueueBuffer(StreamPtr stream, Buffer::Tag tag, std::vector<u8>&& data) {
+    return stream->QueueBuffer(std::make_shared<Buffer>(tag, std::move(data)));
+}
+
+} // namespace AudioCore
diff --git a/src/audio_core/audio_out.h b/src/audio_core/audio_out.h
new file mode 100644
index 000000000..a86499d10
--- /dev/null
+++ b/src/audio_core/audio_out.h
@@ -0,0 +1,44 @@
+// Copyright 2018 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include <vector>
+
+#include "audio_core/buffer.h"
+#include "audio_core/stream.h"
+#include "common/common_types.h"
+
+namespace AudioCore {
+
+using StreamPtr = std::shared_ptr<Stream>;
+
+/**
+ * Represents an audio playback interface, used to open and play audio streams
+ */
+class AudioOut {
+public:
+    /// Opens a new audio stream
+    StreamPtr OpenStream(int sample_rate, int num_channels,
+                         Stream::ReleaseCallback&& release_callback);
+
+    /// Returns a vector of recently released buffers specified by tag for the specified stream
+    std::vector<u64> GetTagsAndReleaseBuffers(StreamPtr stream, size_t max_count);
+
+    /// Starts an audio stream for playback
+    void StartStream(StreamPtr stream);
+
+    /// Stops an audio stream that is currently playing
+    void StopStream(StreamPtr stream);
+
+    /// Queues a buffer into the specified audio stream, returns true on success
+    bool QueueBuffer(StreamPtr stream, Buffer::Tag tag, std::vector<u8>&& data);
+
+private:
+    /// Active audio streams on the interface
+    std::vector<StreamPtr> streams;
+};
+
+} // namespace AudioCore
diff --git a/src/audio_core/buffer.h b/src/audio_core/buffer.h
new file mode 100644
index 000000000..874ec787e
--- /dev/null
+++ b/src/audio_core/buffer.h
@@ -0,0 +1,37 @@
+// Copyright 2018 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <vector>
+
+#include "common/common_types.h"
+
+namespace AudioCore {
+
+/**
+ * Represents a buffer of audio samples to be played in an audio stream
+ */
+class Buffer {
+public:
+    using Tag = u64;
+
+    Buffer(Tag tag, std::vector<u8>&& data) : tag{tag}, data{std::move(data)} {}
+
+    /// Returns the raw audio data for the buffer
+    const std::vector<u8>& GetData() const {
+        return data;
+    }
+
+    /// Returns the buffer tag, this is provided by the game to the audout service
+    Tag GetTag() const {
+        return tag;
+    }
+
+private:
+    Tag tag;
+    std::vector<u8> data;
+};
+
+} // namespace AudioCore
diff --git a/src/audio_core/stream.cpp b/src/audio_core/stream.cpp
new file mode 100644
index 000000000..82bff4b9e
--- /dev/null
+++ b/src/audio_core/stream.cpp
@@ -0,0 +1,103 @@
+// Copyright 2018 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "common/assert.h"
+#include "common/logging/log.h"
+#include "core/core_timing.h"
+#include "core/core_timing_util.h"
+
+#include "audio_core/stream.h"
+
+namespace AudioCore {
+
+constexpr size_t MaxAudioBufferCount{32};
+
+/// Returns the sample size for the specified audio stream format
+static size_t SampleSizeFromFormat(Stream::Format format) {
+    switch (format) {
+    case Stream::Format::Mono16:
+        return 2;
+    case Stream::Format::Stereo16:
+        return 4;
+    case Stream::Format::Multi51Channel16:
+        return 12;
+    };
+
+    LOG_CRITICAL(Audio, "Unimplemented format={}", static_cast<u32>(format));
+    UNREACHABLE();
+    return {};
+}
+
+Stream::Stream(int sample_rate, Format format, ReleaseCallback&& release_callback)
+    : sample_rate{sample_rate}, format{format}, release_callback{std::move(release_callback)} {
+    release_event = CoreTiming::RegisterEvent(
+        "Stream::Release", [this](u64 userdata, int cycles_late) { ReleaseActiveBuffer(); });
+}
+
+void Stream::Play() {
+    state = State::Playing;
+    PlayNextBuffer();
+}
+
+void Stream::Stop() {
+    ASSERT_MSG(false, "Unimplemented");
+}
+
+s64 Stream::GetBufferReleaseCycles(const Buffer& buffer) const {
+    const size_t num_samples{buffer.GetData().size() / SampleSizeFromFormat(format)};
+    return CoreTiming::usToCycles((static_cast<u64>(num_samples) * 1000000) / sample_rate);
+}
+
+void Stream::PlayNextBuffer() {
+    if (!IsPlaying()) {
+        // Ensure we are in playing state before playing the next buffer
+        return;
+    }
+
+    if (active_buffer) {
+        // Do not queue a new buffer if we are already playing a buffer
+        return;
+    }
+
+    if (queued_buffers.empty()) {
+        // No queued buffers - we are effectively paused
+        return;
+    }
+
+    active_buffer = queued_buffers.front();
+    queued_buffers.pop();
+
+    CoreTiming::ScheduleEventThreadsafe(GetBufferReleaseCycles(*active_buffer), release_event, {});
+}
+
+void Stream::ReleaseActiveBuffer() {
+    released_buffers.push(std::move(active_buffer));
+    release_callback();
+    PlayNextBuffer();
+}
+
+bool Stream::QueueBuffer(BufferPtr&& buffer) {
+    if (queued_buffers.size() < MaxAudioBufferCount) {
+        queued_buffers.push(std::move(buffer));
+        PlayNextBuffer();
+        return true;
+    }
+    return false;
+}
+
+bool Stream::ContainsBuffer(Buffer::Tag tag) const {
+    ASSERT_MSG(false, "Unimplemented");
+    return {};
+}
+
+std::vector<Buffer::Tag> Stream::GetTagsAndReleaseBuffers(size_t max_count) {
+    std::vector<Buffer::Tag> tags;
+    for (size_t count = 0; count < max_count && !released_buffers.empty(); ++count) {
+        tags.push_back(released_buffers.front()->GetTag());
+        released_buffers.pop();
+    }
+    return tags;
+}
+
+} // namespace AudioCore
diff --git a/src/audio_core/stream.h b/src/audio_core/stream.h
new file mode 100644
index 000000000..5f43b0798
--- /dev/null
+++ b/src/audio_core/stream.h
@@ -0,0 +1,89 @@
+// Copyright 2018 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <functional>
+#include <memory>
+#include <vector>
+#include <queue>
+
+#include "audio_core/buffer.h"
+#include "common/assert.h"
+#include "common/common_types.h"
+#include "core/core_timing.h"
+
+namespace AudioCore {
+
+using BufferPtr = std::shared_ptr<Buffer>;
+
+/**
+ * Represents an audio stream, which is a sequence of queued buffers, to be outputed by AudioOut
+ */
+class Stream {
+public:
+    /// Audio format of the stream
+    enum class Format {
+        Mono16,
+        Stereo16,
+        Multi51Channel16,
+    };
+
+    /// Callback function type, used to change guest state on a buffer being released
+    using ReleaseCallback = std::function<void()>;
+
+    Stream(int sample_rate, Format format, ReleaseCallback&& release_callback);
+
+    /// Plays the audio stream
+    void Play();
+
+    /// Stops the audio stream
+    void Stop();
+
+    /// Queues a buffer into the audio stream, returns true on success
+    bool QueueBuffer(BufferPtr&& buffer);
+
+    /// Returns true if the audio stream contains a buffer with the specified tag
+    bool ContainsBuffer(Buffer::Tag tag) const;
+
+    /// Returns a vector of recently released buffers specified by tag
+    std::vector<Buffer::Tag> GetTagsAndReleaseBuffers(size_t max_count);
+
+    /// Returns true if the stream is currently playing
+    bool IsPlaying() const {
+        return state == State::Playing;
+    }
+
+    /// Returns the number of queued buffers
+    size_t GetQueueSize() const {
+        return queued_buffers.size();
+    }
+
+private:
+    /// Current state of the stream
+    enum class State {
+        Stopped,
+        Playing,
+    };
+
+    /// Plays the next queued buffer in the audio stream, starting playback if necessary
+    void PlayNextBuffer();
+
+    /// Releases the actively playing buffer, signalling that it has been completed
+    void ReleaseActiveBuffer();
+
+    /// Gets the number of core cycles when the specified buffer will be released
+    s64 GetBufferReleaseCycles(const Buffer& buffer) const;
+
+    int sample_rate;                        ///< Sample rate of the stream
+    Format format;                          ///< Format of the stream
+    ReleaseCallback release_callback;       ///< Buffer release callback for the stream
+    State state{State::Stopped};            ///< Playback state of the stream
+    CoreTiming::EventType* release_event{}; ///< Core timing release event for the stream
+    BufferPtr active_buffer;                ///< Actively playing buffer in the stream
+    std::queue<BufferPtr> queued_buffers;   ///< Buffers queued to be played in the stream
+    std::queue<BufferPtr> released_buffers; ///< Buffers recently released from the stream
+};
+
+} // namespace AudioCore
diff --git a/src/common/logging/backend.cpp b/src/common/logging/backend.cpp
index 67a803e23..38cc85e23 100644
--- a/src/common/logging/backend.cpp
+++ b/src/common/logging/backend.cpp
@@ -176,6 +176,7 @@ void FileBackend::Write(const Entry& entry) {
     SUB(Service, LBL)                                                                              \
     SUB(Service, LDN)                                                                              \
     SUB(Service, LM)                                                                               \
+    SUB(Service, Mii)                                                                              \
     SUB(Service, MM)                                                                               \
     SUB(Service, NCM)                                                                              \
     SUB(Service, NFC)                                                                              \
diff --git a/src/common/logging/log.h b/src/common/logging/log.h
index a3e805794..db4a80d0a 100644
--- a/src/common/logging/log.h
+++ b/src/common/logging/log.h
@@ -63,6 +63,7 @@ enum class Class : ClassType {
     Service_LBL,       ///< The LBL (LCD backlight) service
     Service_LDN,       ///< The LDN (Local domain network) service
     Service_LM,        ///< The LM (Logger) service
+    Service_Mii,       ///< The Mii service
     Service_MM,        ///< The MM (Multimedia) service
     Service_NCM,       ///< The NCM service
     Service_NFC,       ///< The NFC (Near-field communication) service
diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index 7b60f9163..f1e7e2593 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -23,6 +23,8 @@ add_library(core STATIC
     file_sys/partition_filesystem.h
     file_sys/program_metadata.cpp
     file_sys/program_metadata.h
+    file_sys/romfs.cpp
+    file_sys/romfs.h
     file_sys/romfs_factory.cpp
     file_sys/romfs_factory.h
     file_sys/savedata_factory.cpp
@@ -35,6 +37,8 @@ add_library(core STATIC
     file_sys/vfs_offset.h
     file_sys/vfs_real.cpp
     file_sys/vfs_real.h
+    file_sys/vfs_vector.cpp
+    file_sys/vfs_vector.h
     frontend/emu_window.cpp
     frontend/emu_window.h
     frontend/framebuffer_layout.cpp
@@ -174,6 +178,8 @@ add_library(core STATIC
     hle/service/ldr/ldr.h
     hle/service/lm/lm.cpp
     hle/service/lm/lm.h
+    hle/service/mii/mii.cpp
+    hle/service/mii/mii.h
     hle/service/mm/mm_u.cpp
     hle/service/mm/mm_u.h
     hle/service/ncm/ncm.cpp
@@ -307,7 +313,7 @@ add_library(core STATIC
 
 create_target_directory_groups(core)
 
-target_link_libraries(core PUBLIC common PRIVATE video_core)
+target_link_libraries(core PUBLIC common PRIVATE audio_core video_core)
 target_link_libraries(core PUBLIC Boost::boost PRIVATE fmt lz4_static unicorn)
 
 if (ARCHITECTURE_x86_64)
diff --git a/src/core/core.cpp b/src/core/core.cpp
index b7f4b4532..186fa46df 100644
--- a/src/core/core.cpp
+++ b/src/core/core.cpp
@@ -177,6 +177,7 @@ System::ResultStatus System::Init(EmuWindow* emu_window, u32 system_mode) {
     }
 
     gpu_core = std::make_unique<Tegra::GPU>();
+    audio_core = std::make_unique<AudioCore::AudioOut>();
     telemetry_session = std::make_unique<Core::TelemetrySession>();
     service_manager = std::make_shared<Service::SM::ServiceManager>();
 
@@ -228,6 +229,7 @@ void System::Shutdown() {
     service_manager.reset();
     telemetry_session.reset();
     gpu_core.reset();
+    audio_core.reset();
 
     // Close all CPU/threading state
     cpu_barrier->NotifyEnd();
diff --git a/src/core/core.h b/src/core/core.h
index c123fe401..6f4df775f 100644
--- a/src/core/core.h
+++ b/src/core/core.h
@@ -8,6 +8,7 @@
 #include <memory>
 #include <string>
 #include <thread>
+#include "audio_core/audio_out.h"
 #include "common/common_types.h"
 #include "core/arm/exclusive_monitor.h"
 #include "core/core_cpu.h"
@@ -131,6 +132,11 @@ public:
         return *gpu_core;
     }
 
+    /// Gets the AudioCore interface
+    AudioCore::AudioOut& AudioCore() {
+        return *audio_core;
+    }
+
     /// Gets the scheduler for the CPU core that is currently running
     Kernel::Scheduler& CurrentScheduler() {
         return *CurrentCpuCore().Scheduler();
@@ -195,6 +201,7 @@ private:
     /// AppLoader used to load the current executing application
     std::unique_ptr<Loader::AppLoader> app_loader;
     std::unique_ptr<Tegra::GPU> gpu_core;
+    std::unique_ptr<AudioCore::AudioOut> audio_core;
     std::shared_ptr<Tegra::DebugContext> debug_context;
     Kernel::SharedPtr<Kernel::Process> current_process;
     std::shared_ptr<ExclusiveMonitor> cpu_exclusive_monitor;
diff --git a/src/core/file_sys/content_archive.cpp b/src/core/file_sys/content_archive.cpp
index d6b20c047..61cb0bbe3 100644
--- a/src/core/file_sys/content_archive.cpp
+++ b/src/core/file_sys/content_archive.cpp
@@ -9,6 +9,7 @@
 #include "core/file_sys/content_archive.h"
 #include "core/file_sys/vfs_offset.h"
 #include "core/loader/loader.h"
+#include "romfs.h"
 
 namespace FileSys {
 
@@ -46,21 +47,9 @@ struct PFS0Superblock {
 };
 static_assert(sizeof(PFS0Superblock) == 0x200, "PFS0Superblock has incorrect size.");
 
-struct IVFCLevel {
-    u64_le offset;
-    u64_le size;
-    u32_le block_size;
-    u32_le reserved;
-};
-static_assert(sizeof(IVFCLevel) == 0x18, "IVFCLevel has incorrect size.");
-
 struct RomFSSuperblock {
     NCASectionHeaderBlock header_block;
-    u32_le magic;
-    u32_le magic_number;
-    INSERT_PADDING_BYTES(8);
-    std::array<IVFCLevel, 6> levels;
-    INSERT_PADDING_BYTES(64);
+    IVFCHeader ivfc;
 };
 static_assert(sizeof(RomFSSuperblock) == 0xE8, "RomFSSuperblock has incorrect size.");
 
@@ -92,8 +81,8 @@ NCA::NCA(VirtualFile file_) : file(std::move(file_)) {
 
             const size_t romfs_offset =
                 header.section_tables[i].media_offset * MEDIA_OFFSET_MULTIPLIER +
-                sb.levels[IVFC_MAX_LEVEL - 1].offset;
-            const size_t romfs_size = sb.levels[IVFC_MAX_LEVEL - 1].size;
+                sb.ivfc.levels[IVFC_MAX_LEVEL - 1].offset;
+            const size_t romfs_size = sb.ivfc.levels[IVFC_MAX_LEVEL - 1].size;
             files.emplace_back(std::make_shared<OffsetVfsFile>(file, romfs_size, romfs_offset));
             romfs = files.back();
         } else if (block.filesystem_type == NCASectionFilesystemType::PFS0) {
diff --git a/src/core/file_sys/romfs.cpp b/src/core/file_sys/romfs.cpp
new file mode 100644
index 000000000..ff3ddb29c
--- /dev/null
+++ b/src/core/file_sys/romfs.cpp
@@ -0,0 +1,124 @@
+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "common/common_types.h"
+#include "common/swap.h"
+#include "core/file_sys/romfs.h"
+#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs_offset.h"
+#include "core/file_sys/vfs_vector.h"
+
+namespace FileSys {
+
+constexpr u32 ROMFS_ENTRY_EMPTY = 0xFFFFFFFF;
+
+struct TableLocation {
+    u64_le offset;
+    u64_le size;
+};
+static_assert(sizeof(TableLocation) == 0x10, "TableLocation has incorrect size.");
+
+struct RomFSHeader {
+    u64_le header_size;
+    TableLocation directory_hash;
+    TableLocation directory_meta;
+    TableLocation file_hash;
+    TableLocation file_meta;
+    u64_le data_offset;
+};
+static_assert(sizeof(RomFSHeader) == 0x50, "RomFSHeader has incorrect size.");
+
+struct DirectoryEntry {
+    u32_le sibling;
+    u32_le child_dir;
+    u32_le child_file;
+    u32_le hash;
+    u32_le name_length;
+};
+static_assert(sizeof(DirectoryEntry) == 0x14, "DirectoryEntry has incorrect size.");
+
+struct FileEntry {
+    u32_le parent;
+    u32_le sibling;
+    u64_le offset;
+    u64_le size;
+    u32_le hash;
+    u32_le name_length;
+};
+static_assert(sizeof(FileEntry) == 0x20, "FileEntry has incorrect size.");
+
+template <typename Entry>
+static std::pair<Entry, std::string> GetEntry(const VirtualFile& file, size_t offset) {
+    Entry entry{};
+    if (file->ReadObject(&entry, offset) != sizeof(Entry))
+        return {};
+    std::string string(entry.name_length, '\0');
+    if (file->ReadArray(&string[0], string.size(), offset + sizeof(Entry)) != string.size())
+        return {};
+    return {entry, string};
+}
+
+void ProcessFile(VirtualFile file, size_t file_offset, size_t data_offset, u32 this_file_offset,
+                 std::shared_ptr<VectorVfsDirectory> parent) {
+    while (true) {
+        auto entry = GetEntry<FileEntry>(file, file_offset + this_file_offset);
+
+        parent->AddFile(std::make_shared<OffsetVfsFile>(
+            file, entry.first.size, entry.first.offset + data_offset, entry.second, parent));
+
+        if (entry.first.sibling == ROMFS_ENTRY_EMPTY)
+            break;
+
+        this_file_offset = entry.first.sibling;
+    }
+}
+
+void ProcessDirectory(VirtualFile file, size_t dir_offset, size_t file_offset, size_t data_offset,
+                      u32 this_dir_offset, std::shared_ptr<VectorVfsDirectory> parent) {
+    while (true) {
+        auto entry = GetEntry<DirectoryEntry>(file, dir_offset + this_dir_offset);
+        auto current = std::make_shared<VectorVfsDirectory>(
+            std::vector<VirtualFile>{}, std::vector<VirtualDir>{}, parent, entry.second);
+
+        if (entry.first.child_file != ROMFS_ENTRY_EMPTY) {
+            ProcessFile(file, file_offset, data_offset, entry.first.child_file, current);
+        }
+
+        if (entry.first.child_dir != ROMFS_ENTRY_EMPTY) {
+            ProcessDirectory(file, dir_offset, file_offset, data_offset, entry.first.child_dir,
+                             current);
+        }
+
+        parent->AddDirectory(current);
+        if (entry.first.sibling == ROMFS_ENTRY_EMPTY)
+            break;
+        this_dir_offset = entry.first.sibling;
+    }
+}
+
+VirtualDir ExtractRomFS(VirtualFile file) {
+    RomFSHeader header{};
+    if (file->ReadObject(&header) != sizeof(RomFSHeader))
+        return nullptr;
+
+    if (header.header_size != sizeof(RomFSHeader))
+        return nullptr;
+
+    const u64 file_offset = header.file_meta.offset;
+    const u64 dir_offset = header.directory_meta.offset + 4;
+
+    const auto root =
+        std::make_shared<VectorVfsDirectory>(std::vector<VirtualFile>{}, std::vector<VirtualDir>{},
+                                             file->GetContainingDirectory(), file->GetName());
+
+    ProcessDirectory(file, dir_offset, file_offset, header.data_offset, 0, root);
+
+    VirtualDir out = std::move(root);
+
+    while (out->GetSubdirectory("") != nullptr)
+        out = out->GetSubdirectory("");
+
+    return out;
+}
+} // namespace FileSys
diff --git a/src/core/file_sys/romfs.h b/src/core/file_sys/romfs.h
new file mode 100644
index 000000000..03a876d22
--- /dev/null
+++ b/src/core/file_sys/romfs.h
@@ -0,0 +1,35 @@
+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <array>
+#include "common/common_funcs.h"
+#include "common/swap.h"
+#include "core/file_sys/vfs.h"
+
+namespace FileSys {
+
+struct IVFCLevel {
+    u64_le offset;
+    u64_le size;
+    u32_le block_size;
+    u32_le reserved;
+};
+static_assert(sizeof(IVFCLevel) == 0x18, "IVFCLevel has incorrect size.");
+
+struct IVFCHeader {
+    u32_le magic;
+    u32_le magic_number;
+    INSERT_PADDING_BYTES(8);
+    std::array<IVFCLevel, 6> levels;
+    INSERT_PADDING_BYTES(64);
+};
+static_assert(sizeof(IVFCHeader) == 0xE0, "IVFCHeader has incorrect size.");
+
+// Converts a RomFS binary blob to VFS Filesystem
+// Returns nullptr on failure
+VirtualDir ExtractRomFS(VirtualFile file);
+
+} // namespace FileSys
diff --git a/src/core/file_sys/vfs.cpp b/src/core/file_sys/vfs.cpp
index b99a4fd5b..84a6a7397 100644
--- a/src/core/file_sys/vfs.cpp
+++ b/src/core/file_sys/vfs.cpp
@@ -46,6 +46,13 @@ size_t VfsFile::WriteBytes(const std::vector<u8>& data, size_t offset) {
     return Write(data.data(), data.size(), offset);
 }
 
+std::string VfsFile::GetFullPath() const {
+    if (GetContainingDirectory() == nullptr)
+        return "/" + GetName();
+
+    return GetContainingDirectory()->GetFullPath() + "/" + GetName();
+}
+
 std::shared_ptr<VfsFile> VfsDirectory::GetFileRelative(std::string_view path) const {
     auto vec = FileUtil::SplitPathComponents(path);
     vec.erase(std::remove_if(vec.begin(), vec.end(), [](const auto& str) { return str.empty(); }),
@@ -243,6 +250,13 @@ bool VfsDirectory::Copy(std::string_view src, std::string_view dest) {
     return f2->WriteBytes(f1->ReadAllBytes()) == f1->GetSize();
 }
 
+std::string VfsDirectory::GetFullPath() const {
+    if (IsRoot())
+        return GetName();
+
+    return GetParentDirectory()->GetFullPath() + "/" + GetName();
+}
+
 bool ReadOnlyVfsDirectory::IsWritable() const {
     return false;
 }
@@ -270,4 +284,13 @@ bool ReadOnlyVfsDirectory::DeleteFile(std::string_view name) {
 bool ReadOnlyVfsDirectory::Rename(std::string_view name) {
     return false;
 }
+
+bool VfsRawCopy(VirtualFile src, VirtualFile dest) {
+    if (src == nullptr || dest == nullptr)
+        return false;
+    if (!dest->Resize(src->GetSize()))
+        return false;
+    std::vector<u8> data = src->ReadAllBytes();
+    return dest->WriteBytes(data, 0) == data.size();
+}
 } // namespace FileSys
diff --git a/src/core/file_sys/vfs.h b/src/core/file_sys/vfs.h
index 4a13b8378..cf871edd6 100644
--- a/src/core/file_sys/vfs.h
+++ b/src/core/file_sys/vfs.h
@@ -113,6 +113,9 @@ struct VfsFile : NonCopyable {
 
     // Renames the file to name. Returns whether or not the operation was successsful.
     virtual bool Rename(std::string_view name) = 0;
+
+    // Returns the full path of this file as a string, recursively
+    virtual std::string GetFullPath() const;
 };
 
 // A class representing a directory in an abstract filesystem.
@@ -213,6 +216,17 @@ struct VfsDirectory : NonCopyable {
         return ReplaceFileWithSubdirectory(file_p, std::make_shared<Directory>(file_p));
     }
 
+    bool InterpretAsDirectory(const std::function<VirtualDir(VirtualFile)>& function,
+                              const std::string& file) {
+        auto file_p = GetFile(file);
+        if (file_p == nullptr)
+            return false;
+        return ReplaceFileWithSubdirectory(file_p, function(file_p));
+    }
+
+    // Returns the full path of this directory as a string, recursively
+    virtual std::string GetFullPath() const;
+
 protected:
     // Backend for InterpretAsDirectory.
     // Removes all references to file and adds a reference to dir in the directory's implementation.
@@ -230,4 +244,10 @@ struct ReadOnlyVfsDirectory : public VfsDirectory {
     bool DeleteFile(std::string_view name) override;
     bool Rename(std::string_view name) override;
 };
+
+// A method that copies the raw data between two different implementations of VirtualFile. If you
+// are using the same implementation, it is probably better to use the Copy method in the parent
+// directory of src/dest.
+bool VfsRawCopy(VirtualFile src, VirtualFile dest);
+
 } // namespace FileSys
diff --git a/src/core/file_sys/vfs_offset.cpp b/src/core/file_sys/vfs_offset.cpp
index a40331cef..847cde2f5 100644
--- a/src/core/file_sys/vfs_offset.cpp
+++ b/src/core/file_sys/vfs_offset.cpp
@@ -10,8 +10,9 @@
 namespace FileSys {
 
 OffsetVfsFile::OffsetVfsFile(std::shared_ptr<VfsFile> file_, size_t size_, size_t offset_,
-                             std::string name_)
-    : file(std::move(file_)), offset(offset_), size(size_), name(std::move(name_)) {}
+                             std::string name_, VirtualDir parent_)
+    : file(file_), offset(offset_), size(size_), name(std::move(name_)),
+      parent(parent_ == nullptr ? file->GetContainingDirectory() : std::move(parent_)) {}
 
 std::string OffsetVfsFile::GetName() const {
     return name.empty() ? file->GetName() : name;
@@ -35,7 +36,7 @@ bool OffsetVfsFile::Resize(size_t new_size) {
 }
 
 std::shared_ptr<VfsDirectory> OffsetVfsFile::GetContainingDirectory() const {
-    return file->GetContainingDirectory();
+    return parent;
 }
 
 bool OffsetVfsFile::IsWritable() const {
diff --git a/src/core/file_sys/vfs_offset.h b/src/core/file_sys/vfs_offset.h
index 4f471e3ba..235970dc5 100644
--- a/src/core/file_sys/vfs_offset.h
+++ b/src/core/file_sys/vfs_offset.h
@@ -17,7 +17,7 @@ namespace FileSys {
 // the size of this wrapper.
 struct OffsetVfsFile : public VfsFile {
     OffsetVfsFile(std::shared_ptr<VfsFile> file, size_t size, size_t offset = 0,
-                  std::string new_name = "");
+                  std::string new_name = "", VirtualDir new_parent = nullptr);
 
     std::string GetName() const override;
     size_t GetSize() const override;
@@ -44,6 +44,7 @@ private:
     size_t offset;
     size_t size;
     std::string name;
+    VirtualDir parent;
 };
 
 } // namespace FileSys
diff --git a/src/core/file_sys/vfs_real.cpp b/src/core/file_sys/vfs_real.cpp
index 9ce2e1efa..82d54da4a 100644
--- a/src/core/file_sys/vfs_real.cpp
+++ b/src/core/file_sys/vfs_real.cpp
@@ -195,6 +195,12 @@ bool RealVfsDirectory::Rename(std::string_view name) {
     return FileUtil::Rename(path, new_name);
 }
 
+std::string RealVfsDirectory::GetFullPath() const {
+    auto out = path;
+    std::replace(out.begin(), out.end(), '\\', '/');
+    return out;
+}
+
 bool RealVfsDirectory::ReplaceFileWithSubdirectory(VirtualFile file, VirtualDir dir) {
     const auto iter = std::find(files.begin(), files.end(), file);
     if (iter == files.end())
diff --git a/src/core/file_sys/vfs_real.h b/src/core/file_sys/vfs_real.h
index 2151211c9..243d58576 100644
--- a/src/core/file_sys/vfs_real.h
+++ b/src/core/file_sys/vfs_real.h
@@ -41,7 +41,7 @@ private:
 
 // An implementation of VfsDirectory that represents a directory on the user's computer.
 struct RealVfsDirectory : public VfsDirectory {
-    RealVfsDirectory(const std::string& path, Mode perms);
+    RealVfsDirectory(const std::string& path, Mode perms = Mode::Read);
 
     std::vector<std::shared_ptr<VfsFile>> GetFiles() const override;
     std::vector<std::shared_ptr<VfsDirectory>> GetSubdirectories() const override;
@@ -54,6 +54,7 @@ struct RealVfsDirectory : public VfsDirectory {
     bool DeleteSubdirectory(std::string_view name) override;
     bool DeleteFile(std::string_view name) override;
     bool Rename(std::string_view name) override;
+    std::string GetFullPath() const override;
 
 protected:
     bool ReplaceFileWithSubdirectory(VirtualFile file, VirtualDir dir) override;
diff --git a/src/core/file_sys/vfs_vector.cpp b/src/core/file_sys/vfs_vector.cpp
new file mode 100644
index 000000000..4c6337e3a
--- /dev/null
+++ b/src/core/file_sys/vfs_vector.cpp
@@ -0,0 +1,83 @@
+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <algorithm>
+#include "core/file_sys/vfs_vector.h"
+
+namespace FileSys {
+VectorVfsDirectory::VectorVfsDirectory(std::vector<VirtualFile> files_,
+                                       std::vector<VirtualDir> dirs_, VirtualDir parent_,
+                                       std::string name_)
+    : files(std::move(files_)), dirs(std::move(dirs_)), parent(std::move(parent_)),
+      name(std::move(name_)) {}
+
+std::vector<std::shared_ptr<VfsFile>> VectorVfsDirectory::GetFiles() const {
+    return files;
+}
+
+std::vector<std::shared_ptr<VfsDirectory>> VectorVfsDirectory::GetSubdirectories() const {
+    return dirs;
+}
+
+bool VectorVfsDirectory::IsWritable() const {
+    return false;
+}
+
+bool VectorVfsDirectory::IsReadable() const {
+    return true;
+}
+
+std::string VectorVfsDirectory::GetName() const {
+    return name;
+}
+std::shared_ptr<VfsDirectory> VectorVfsDirectory::GetParentDirectory() const {
+    return parent;
+}
+
+template <typename T>
+static bool FindAndRemoveVectorElement(std::vector<T>& vec, std::string_view name) {
+    auto iter = std::find_if(vec.begin(), vec.end(), [name](T e) { return e->GetName() == name; });
+    if (iter == vec.end())
+        return false;
+    auto old_size = vec.size();
+    vec.erase(iter);
+    return true;
+}
+
+bool VectorVfsDirectory::DeleteSubdirectory(std::string_view name) {
+    return FindAndRemoveVectorElement(dirs, name);
+}
+
+bool VectorVfsDirectory::DeleteFile(std::string_view name) {
+    return FindAndRemoveVectorElement(files, name);
+}
+
+bool VectorVfsDirectory::Rename(std::string_view name_) {
+    name = name_;
+    return true;
+}
+
+std::shared_ptr<VfsDirectory> VectorVfsDirectory::CreateSubdirectory(std::string_view name) {
+    return nullptr;
+}
+
+std::shared_ptr<VfsFile> VectorVfsDirectory::CreateFile(std::string_view name) {
+    return nullptr;
+}
+
+void VectorVfsDirectory::AddFile(VirtualFile file) {
+    files.push_back(std::move(file));
+}
+
+void VectorVfsDirectory::AddDirectory(VirtualDir dir) {
+    dirs.push_back(std::move(dir));
+}
+
+bool VectorVfsDirectory::ReplaceFileWithSubdirectory(VirtualFile file, VirtualDir dir) {
+    if (!DeleteFile(file->GetName()))
+        return false;
+    dirs.emplace_back(dir);
+    return true;
+}
+} // namespace FileSys
diff --git a/src/core/file_sys/vfs_vector.h b/src/core/file_sys/vfs_vector.h
new file mode 100644
index 000000000..ba469647b
--- /dev/null
+++ b/src/core/file_sys/vfs_vector.h
@@ -0,0 +1,44 @@
+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "core/file_sys/vfs.h"
+
+namespace FileSys {
+
+// An implementation of VfsDirectory that maintains two vectors for subdirectories and files.
+// Vector data is supplied upon construction.
+struct VectorVfsDirectory : public VfsDirectory {
+    explicit VectorVfsDirectory(std::vector<VirtualFile> files = {},
+                                std::vector<VirtualDir> dirs = {}, VirtualDir parent = nullptr,
+                                std::string name = "");
+
+    std::vector<std::shared_ptr<VfsFile>> GetFiles() const override;
+    std::vector<std::shared_ptr<VfsDirectory>> GetSubdirectories() const override;
+    bool IsWritable() const override;
+    bool IsReadable() const override;
+    std::string GetName() const override;
+    std::shared_ptr<VfsDirectory> GetParentDirectory() const override;
+    bool DeleteSubdirectory(std::string_view name) override;
+    bool DeleteFile(std::string_view name) override;
+    bool Rename(std::string_view name) override;
+    std::shared_ptr<VfsDirectory> CreateSubdirectory(std::string_view name) override;
+    std::shared_ptr<VfsFile> CreateFile(std::string_view name) override;
+
+    virtual void AddFile(VirtualFile file);
+    virtual void AddDirectory(VirtualDir dir);
+
+protected:
+    bool ReplaceFileWithSubdirectory(VirtualFile file, VirtualDir dir) override;
+
+private:
+    std::vector<VirtualFile> files;
+    std::vector<VirtualDir> dirs;
+
+    VirtualDir parent;
+    std::string name;
+};
+
+} // namespace FileSys
diff --git a/src/core/hle/service/audio/audout_u.cpp b/src/core/hle/service/audio/audout_u.cpp
index 1dcd84d98..a15d53ff8 100644
--- a/src/core/hle/service/audio/audout_u.cpp
+++ b/src/core/hle/service/audio/audout_u.cpp
@@ -5,8 +5,7 @@
 #include <array>
 #include <vector>
 #include "common/logging/log.h"
-#include "core/core_timing.h"
-#include "core/core_timing_util.h"
+#include "core/core.h"
 #include "core/hle/ipc_helpers.h"
 #include "core/hle/kernel/event.h"
 #include "core/hle/kernel/hle_ipc.h"
@@ -14,17 +13,22 @@
 
 namespace Service::Audio {
 
-/// Switch sample rate frequency
-constexpr u32 sample_rate{48000};
-/// TODO(st4rk): dynamic number of channels, as I think Switch has support
-/// to more audio channels (probably when Docked I guess)
-constexpr u32 audio_channels{2};
-/// TODO(st4rk): find a proper value for the audio_ticks
-constexpr u64 audio_ticks{static_cast<u64>(CoreTiming::BASE_CLOCK_RATE / 500)};
+namespace ErrCodes {
+enum {
+    ErrorUnknown = 2,
+    BufferCountExceeded = 8,
+};
+}
+
+constexpr std::array<char, 10> DefaultDevice{{"DeviceOut"}};
+constexpr int DefaultSampleRate{48000};
 
 class IAudioOut final : public ServiceFramework<IAudioOut> {
 public:
-    IAudioOut() : ServiceFramework("IAudioOut"), audio_out_state(AudioState::Stopped) {
+    IAudioOut(AudoutParams audio_params)
+        : ServiceFramework("IAudioOut"), audio_params(audio_params),
+          audio_core(Core::System::GetInstance().AudioCore()) {
+
         static const FunctionInfo functions[] = {
             {0, &IAudioOut::GetAudioOutState, "GetAudioOutState"},
             {1, &IAudioOut::StartAudioOut, "StartAudioOut"},
@@ -32,66 +36,65 @@ public:
             {3, &IAudioOut::AppendAudioOutBufferImpl, "AppendAudioOutBuffer"},
             {4, &IAudioOut::RegisterBufferEvent, "RegisterBufferEvent"},
             {5, &IAudioOut::GetReleasedAudioOutBufferImpl, "GetReleasedAudioOutBuffer"},
-            {6, nullptr, "ContainsAudioOutBuffer"},
+            {6, &IAudioOut::ContainsAudioOutBuffer, "ContainsAudioOutBuffer"},
             {7, &IAudioOut::AppendAudioOutBufferImpl, "AppendAudioOutBufferAuto"},
             {8, &IAudioOut::GetReleasedAudioOutBufferImpl, "GetReleasedAudioOutBufferAuto"},
-            {9, nullptr, "GetAudioOutBufferCount"},
+            {9, &IAudioOut::GetAudioOutBufferCount, "GetAudioOutBufferCount"},
             {10, nullptr, "GetAudioOutPlayedSampleCount"},
             {11, nullptr, "FlushAudioOutBuffers"},
         };
         RegisterHandlers(functions);
 
         // This is the event handle used to check if the audio buffer was released
-        buffer_event =
-            Kernel::Event::Create(Kernel::ResetType::OneShot, "IAudioOutBufferReleasedEvent");
-
-        // Register event callback to update the Audio Buffer
-        audio_event = CoreTiming::RegisterEvent(
-            "IAudioOut::UpdateAudioBuffersCallback", [this](u64 userdata, int cycles_late) {
-                UpdateAudioBuffersCallback();
-                CoreTiming::ScheduleEvent(audio_ticks - cycles_late, audio_event);
-            });
-
-        // Start the audio event
-        CoreTiming::ScheduleEvent(audio_ticks, audio_event);
-    }
+        buffer_event = Kernel::Event::Create(Kernel::ResetType::Sticky, "IAudioOutBufferReleased");
 
-    ~IAudioOut() {
-        CoreTiming::UnscheduleEvent(audio_event, 0);
+        stream = audio_core.OpenStream(audio_params.sample_rate, audio_params.channel_count,
+                                       [=]() { buffer_event->Signal(); });
     }
 
 private:
+    struct AudioBuffer {
+        u64_le next;
+        u64_le buffer;
+        u64_le buffer_capacity;
+        u64_le buffer_size;
+        u64_le offset;
+    };
+    static_assert(sizeof(AudioBuffer) == 0x28, "AudioBuffer is an invalid size");
+
     void GetAudioOutState(Kernel::HLERequestContext& ctx) {
         LOG_DEBUG(Service_Audio, "called");
         IPC::ResponseBuilder rb{ctx, 3};
         rb.Push(RESULT_SUCCESS);
-        rb.Push(static_cast<u32>(audio_out_state));
+        rb.Push(static_cast<u32>(stream->IsPlaying() ? AudioState::Started : AudioState::Stopped));
     }
 
     void StartAudioOut(Kernel::HLERequestContext& ctx) {
-        LOG_WARNING(Service_Audio, "(STUBBED) called");
+        LOG_DEBUG(Service_Audio, "called");
+
+        if (stream->IsPlaying()) {
+            IPC::ResponseBuilder rb{ctx, 2};
+            rb.Push(ResultCode(ErrorModule::Audio, ErrCodes::ErrorUnknown));
+            return;
+        }
 
-        // Start audio
-        audio_out_state = AudioState::Started;
+        audio_core.StartStream(stream);
 
         IPC::ResponseBuilder rb{ctx, 2};
         rb.Push(RESULT_SUCCESS);
     }
 
     void StopAudioOut(Kernel::HLERequestContext& ctx) {
-        LOG_WARNING(Service_Audio, "(STUBBED) called");
-
-        // Stop audio
-        audio_out_state = AudioState::Stopped;
+        LOG_DEBUG(Service_Audio, "called");
 
-        queue_keys.clear();
+        audio_core.StopStream(stream);
 
         IPC::ResponseBuilder rb{ctx, 2};
         rb.Push(RESULT_SUCCESS);
     }
 
     void RegisterBufferEvent(Kernel::HLERequestContext& ctx) {
-        LOG_WARNING(Service_Audio, "(STUBBED) called");
+        LOG_DEBUG(Service_Audio, "called");
 
         IPC::ResponseBuilder rb{ctx, 2, 1};
         rb.Push(RESULT_SUCCESS);
@@ -99,101 +102,107 @@ private:
     }
 
     void AppendAudioOutBufferImpl(Kernel::HLERequestContext& ctx) {
-        LOG_WARNING(Service_Audio, "(STUBBED) called");
+        LOG_DEBUG(Service_Audio, "(STUBBED) called {}", ctx.Description());
         IPC::RequestParser rp{ctx};
 
-        const u64 key{rp.Pop<u64>()};
-        queue_keys.insert(queue_keys.begin(), key);
+        const auto& input_buffer{ctx.ReadBuffer()};
+        ASSERT_MSG(input_buffer.size() == sizeof(AudioBuffer),
+                   "AudioBuffer input is an invalid size!");
+        AudioBuffer audio_buffer{};
+        std::memcpy(&audio_buffer, input_buffer.data(), sizeof(AudioBuffer));
+        const u64 tag{rp.Pop<u64>()};
+
+        std::vector<u8> data(audio_buffer.buffer_size);
+        Memory::ReadBlock(audio_buffer.buffer, data.data(), data.size());
+
+        if (!audio_core.QueueBuffer(stream, tag, std::move(data))) {
+            IPC::ResponseBuilder rb{ctx, 2};
+            rb.Push(ResultCode(ErrorModule::Audio, ErrCodes::BufferCountExceeded));
+        }
 
         IPC::ResponseBuilder rb{ctx, 2};
         rb.Push(RESULT_SUCCESS);
     }
 
     void GetReleasedAudioOutBufferImpl(Kernel::HLERequestContext& ctx) {
-        LOG_WARNING(Service_Audio, "(STUBBED) called");
-
-        // TODO(st4rk): This is how libtransistor currently implements the
-        // GetReleasedAudioOutBuffer, it should return the key (a VAddr) to the app and this address
-        // is used to know which buffer should be filled with data and send again to the service
-        // through AppendAudioOutBuffer. Check if this is the proper way to do it.
-        u64 key{0};
-
-        if (queue_keys.size()) {
-            key = queue_keys.back();
-            queue_keys.pop_back();
-        }
+        LOG_DEBUG(Service_Audio, "called {}", ctx.Description());
+        IPC::RequestParser rp{ctx};
+        const u64 max_count{ctx.GetWriteBufferSize() / sizeof(u64)};
+        const auto released_buffers{audio_core.GetTagsAndReleaseBuffers(stream, max_count)};
 
-        ctx.WriteBuffer(&key, sizeof(u64));
+        std::vector<u64> tags{released_buffers};
+        tags.resize(max_count);
+        ctx.WriteBuffer(tags);
 
         IPC::ResponseBuilder rb{ctx, 3};
         rb.Push(RESULT_SUCCESS);
-        // TODO(st4rk): This might be the total of released buffers, needs to be verified on
-        // hardware
-        rb.Push<u32>(static_cast<u32>(queue_keys.size()));
+        rb.Push<u32>(static_cast<u32>(released_buffers.size()));
     }
 
-    void UpdateAudioBuffersCallback() {
-        if (audio_out_state != AudioState::Started) {
-            return;
-        }
-
-        if (queue_keys.empty()) {
-            return;
-        }
+    void ContainsAudioOutBuffer(Kernel::HLERequestContext& ctx) {
+        LOG_DEBUG(Service_Audio, "called");
+        IPC::RequestParser rp{ctx};
+        const u64 tag{rp.Pop<u64>()};
+        IPC::ResponseBuilder rb{ctx, 3};
+        rb.Push(RESULT_SUCCESS);
+        rb.Push(stream->ContainsBuffer(tag));
+    }
 
-        buffer_event->Signal();
+    void GetAudioOutBufferCount(Kernel::HLERequestContext& ctx) {
+        LOG_DEBUG(Service_Audio, "called");
+        IPC::ResponseBuilder rb{ctx, 3};
+        rb.Push(RESULT_SUCCESS);
+        rb.Push(static_cast<u32>(stream->GetQueueSize()));
     }
 
-    enum class AudioState : u32 {
-        Started,
-        Stopped,
-    };
+    AudioCore::AudioOut& audio_core;
+    AudioCore::StreamPtr stream;
 
-    /// This is used to trigger the audio event callback that is going to read the samples from the
-    /// audio_buffer list and enqueue the samples using the sink (audio_core).
-    CoreTiming::EventType* audio_event;
+    AudoutParams audio_params{};
 
     /// This is the evend handle used to check if the audio buffer was released
     Kernel::SharedPtr<Kernel::Event> buffer_event;
-
-    /// (st4rk): This is just a temporary workaround for the future implementation. Libtransistor
-    /// uses the key as an address in the App, so we need to return when the
-    /// GetReleasedAudioOutBuffer_1 is called, otherwise we'll run in problems, because
-    /// libtransistor uses the key returned as an pointer.
-    std::vector<u64> queue_keys;
-
-    AudioState audio_out_state;
 };
 
 void AudOutU::ListAudioOutsImpl(Kernel::HLERequestContext& ctx) {
-    LOG_WARNING(Service_Audio, "(STUBBED) called");
+    LOG_DEBUG(Service_Audio, "called");
     IPC::RequestParser rp{ctx};
 
-    constexpr std::array<char, 15> audio_interface{{"AudioInterface"}};
-    ctx.WriteBuffer(audio_interface);
+    ctx.WriteBuffer(DefaultDevice);
 
     IPC::ResponseBuilder rb = rp.MakeBuilder(3, 0, 0);
 
     rb.Push(RESULT_SUCCESS);
-    // TODO(st4rk): We're currently returning only one audio interface (stringlist size). However,
-    // it's highly possible to have more than one interface (despite that libtransistor requires
-    // only one).
-    rb.Push<u32>(1);
+    rb.Push<u32>(1); // Amount of audio devices
 }
 
 void AudOutU::OpenAudioOutImpl(Kernel::HLERequestContext& ctx) {
-    LOG_WARNING(Service_Audio, "(STUBBED) called");
+    LOG_DEBUG(Service_Audio, "called");
 
-    if (!audio_out_interface) {
-        audio_out_interface = std::make_shared<IAudioOut>();
+    ctx.WriteBuffer(DefaultDevice);
+    IPC::RequestParser rp{ctx};
+    auto params{rp.PopRaw<AudoutParams>()};
+    if (params.channel_count <= 2) {
+        // Mono does not exist for audout
+        params.channel_count = 2;
+    } else {
+        params.channel_count = 6;
     }
+    if (!params.sample_rate) {
+        params.sample_rate = DefaultSampleRate;
+    }
+
+    // TODO(bunnei): Support more than one IAudioOut interface. When we add this, ListAudioOutsImpl
+    // will likely need to be updated as well.
+    ASSERT_MSG(!audio_out_interface, "Unimplemented");
+    audio_out_interface = std::make_shared<IAudioOut>(std::move(params));
 
     IPC::ResponseBuilder rb{ctx, 6, 0, 1};
     rb.Push(RESULT_SUCCESS);
-    rb.Push<u32>(sample_rate);
-    rb.Push<u32>(audio_channels);
+    rb.Push<u32>(DefaultSampleRate);
+    rb.Push<u32>(params.channel_count);
     rb.Push<u32>(static_cast<u32>(PcmFormat::Int16));
-    rb.Push<u32>(0); // This field is unknown
+    rb.Push<u32>(static_cast<u32>(AudioState::Stopped));
     rb.PushIpcInterface<Audio::IAudioOut>(audio_out_interface);
 }
 
diff --git a/src/core/hle/service/audio/audout_u.h b/src/core/hle/service/audio/audout_u.h
index 847d86aa6..bc43f1f44 100644
--- a/src/core/hle/service/audio/audout_u.h
+++ b/src/core/hle/service/audio/audout_u.h
@@ -12,6 +12,18 @@ class HLERequestContext;
 
 namespace Service::Audio {
 
+struct AudoutParams {
+    s32_le sample_rate;
+    u16_le channel_count;
+    INSERT_PADDING_BYTES(2);
+};
+static_assert(sizeof(AudoutParams) == 0x8, "AudoutParams is an invalid size");
+
+enum class AudioState : u32 {
+    Started,
+    Stopped,
+};
+
 class IAudioOut;
 
 class AudOutU final : public ServiceFramework<AudOutU> {
diff --git a/src/core/hle/service/mii/mii.cpp b/src/core/hle/service/mii/mii.cpp
new file mode 100644
index 000000000..a6197124a
--- /dev/null
+++ b/src/core/hle/service/mii/mii.cpp
@@ -0,0 +1,107 @@
+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <memory>
+
+#include "common/logging/log.h"
+#include "core/hle/ipc_helpers.h"
+#include "core/hle/kernel/hle_ipc.h"
+#include "core/hle/service/mii/mii.h"
+#include "core/hle/service/service.h"
+#include "core/hle/service/sm/sm.h"
+
+namespace Service::Mii {
+
+class IDatabaseService final : public ServiceFramework<IDatabaseService> {
+public:
+    explicit IDatabaseService() : ServiceFramework{"IDatabaseService"} {
+        // clang-format off
+        static const FunctionInfo functions[] = {
+            {0, nullptr, "IsUpdated"},
+            {1, nullptr, "IsFullDatabase"},
+            {2, nullptr, "GetCount"},
+            {3, nullptr, "Get"},
+            {4, nullptr, "Get1"},
+            {5, nullptr, "UpdateLatest"},
+            {6, nullptr, "BuildRandom"},
+            {7, nullptr, "BuildDefault"},
+            {8, nullptr, "Get2"},
+            {9, nullptr, "Get3"},
+            {10, nullptr, "UpdateLatest1"},
+            {11, nullptr, "FindIndex"},
+            {12, nullptr, "Move"},
+            {13, nullptr, "AddOrReplace"},
+            {14, nullptr, "Delete"},
+            {15, nullptr, "DestroyFile"},
+            {16, nullptr, "DeleteFile"},
+            {17, nullptr, "Format"},
+            {18, nullptr, "Import"},
+            {19, nullptr, "Export"},
+            {20, nullptr, "IsBrokenDatabaseWithClearFlag"},
+            {21, nullptr, "GetIndex"},
+            {22, nullptr, "SetInterfaceVersion"},
+            {23, nullptr, "Convert"},
+        };
+        // clang-format on
+
+        RegisterHandlers(functions);
+    }
+};
+
+class MiiDBModule final : public ServiceFramework<MiiDBModule> {
+public:
+    explicit MiiDBModule(const char* name) : ServiceFramework{name} {
+        // clang-format off
+        static const FunctionInfo functions[] = {
+            {0, &MiiDBModule::GetDatabaseService, "GetDatabaseService"},
+        };
+        // clang-format on
+
+        RegisterHandlers(functions);
+    }
+
+private:
+    void GetDatabaseService(Kernel::HLERequestContext& ctx) {
+        IPC::ResponseBuilder rb{ctx, 2, 0, 1};
+        rb.Push(RESULT_SUCCESS);
+        rb.PushIpcInterface<IDatabaseService>();
+
+        LOG_DEBUG(Service_Mii, "called");
+    }
+};
+
+class MiiImg final : public ServiceFramework<MiiImg> {
+public:
+    explicit MiiImg() : ServiceFramework{"miiimg"} {
+        // clang-format off
+        static const FunctionInfo functions[] = {
+            {0, nullptr, "Initialize"},
+            {10, nullptr, "Reload"},
+            {11, nullptr, "GetCount"},
+            {12, nullptr, "IsEmpty"},
+            {13, nullptr, "IsFull"},
+            {14, nullptr, "GetAttribute"},
+            {15, nullptr, "LoadImage"},
+            {16, nullptr, "AddOrUpdateImage"},
+            {17, nullptr, "DeleteImages"},
+            {100, nullptr, "DeleteFile"},
+            {101, nullptr, "DestroyFile"},
+            {102, nullptr, "ImportFile"},
+            {103, nullptr, "ExportFile"},
+            {104, nullptr, "ForceInitialize"},
+        };
+        // clang-format on
+
+        RegisterHandlers(functions);
+    }
+};
+
+void InstallInterfaces(SM::ServiceManager& sm) {
+    std::make_shared<MiiDBModule>("mii:e")->InstallAsService(sm);
+    std::make_shared<MiiDBModule>("mii:u")->InstallAsService(sm);
+
+    std::make_shared<MiiImg>()->InstallAsService(sm);
+}
+
+} // namespace Service::Mii
diff --git a/src/core/hle/service/mii/mii.h b/src/core/hle/service/mii/mii.h
new file mode 100644
index 000000000..7ce9be50e
--- /dev/null
+++ b/src/core/hle/service/mii/mii.h
@@ -0,0 +1,15 @@
+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+namespace Service::SM {
+class ServiceManager;
+}
+
+namespace Service::Mii {
+
+void InstallInterfaces(SM::ServiceManager& sm);
+
+} // namespace Service::Mii
diff --git a/src/core/hle/service/service.cpp b/src/core/hle/service/service.cpp
index de3723980..5180a0c93 100644
--- a/src/core/hle/service/service.cpp
+++ b/src/core/hle/service/service.cpp
@@ -34,6 +34,7 @@
 #include "core/hle/service/ldn/ldn.h"
 #include "core/hle/service/ldr/ldr.h"
 #include "core/hle/service/lm/lm.h"
+#include "core/hle/service/mii/mii.h"
 #include "core/hle/service/mm/mm_u.h"
 #include "core/hle/service/ncm/ncm.h"
 #include "core/hle/service/nfc/nfc.h"
@@ -212,6 +213,7 @@ void Init(std::shared_ptr<SM::ServiceManager>& sm) {
     LDN::InstallInterfaces(*sm);
     LDR::InstallInterfaces(*sm);
     LM::InstallInterfaces(*sm);
+    Mii::InstallInterfaces(*sm);
     MM::InstallInterfaces(*sm);
     NCM::InstallInterfaces(*sm);
     NFC::InstallInterfaces(*sm);