CoreAudio::HLE: Add FFmpeg aac decoder

.travis/linux-frozen/docker.sh

@@ -3,7 +3,7 @@
 cd /citra
 
 mkdir build && cd build
-cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_C_COMPILER=/usr/lib/ccache/gcc -DCMAKE_CXX_COMPILER=/usr/lib/ccache/g++ -DCITRA_ENABLE_COMPATIBILITY_REPORTING=${ENABLE_COMPATIBILITY_REPORTING:-"OFF"} -DENABLE_COMPATIBILITY_LIST_DOWNLOAD=ON -DUSE_DISCORD_PRESENCE=ON
+cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_C_COMPILER=/usr/lib/ccache/gcc -DCMAKE_CXX_COMPILER=/usr/lib/ccache/g++ -DCITRA_ENABLE_COMPATIBILITY_REPORTING=${ENABLE_COMPATIBILITY_REPORTING:-"OFF"} -DENABLE_COMPATIBILITY_LIST_DOWNLOAD=ON -DUSE_DISCORD_PRESENCE=ON -DENABLE_FFMPEG=OFF
 make -j4
 
 ctest -VV -C Release

.travis/linux/docker.sh

@@ -3,7 +3,7 @@
 cd /citra
 
 mkdir build && cd build
-cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_C_COMPILER=/usr/lib/ccache/gcc -DCMAKE_CXX_COMPILER=/usr/lib/ccache/g++ -DENABLE_QT_TRANSLATION=ON -DCITRA_ENABLE_COMPATIBILITY_REPORTING=${ENABLE_COMPATIBILITY_REPORTING:-"OFF"} -DENABLE_COMPATIBILITY_LIST_DOWNLOAD=ON -DUSE_DISCORD_PRESENCE=ON -DENABLE_SCRIPTING=ON
+cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_C_COMPILER=/usr/lib/ccache/gcc -DCMAKE_CXX_COMPILER=/usr/lib/ccache/g++ -DENABLE_QT_TRANSLATION=ON -DCITRA_ENABLE_COMPATIBILITY_REPORTING=${ENABLE_COMPATIBILITY_REPORTING:-"OFF"} -DENABLE_COMPATIBILITY_LIST_DOWNLOAD=ON -DUSE_DISCORD_PRESENCE=ON -DENABLE_SCRIPTING=ON -DENABLE_FFMPEG=OFF
 make -j4
 
 ctest -VV -C Release

.travis/macos/deps.sh

@@ -1,4 +1,4 @@
 #!/bin/sh -ex
 
 brew update
-brew install qt5 sdl2 dylibbundler p7zip ccache
+brew install qt5 sdl2 dylibbundler p7zip ccache ffmpeg

.travis/transifex/docker.sh

@@ -26,7 +26,7 @@ tx --version
 
 cd /citra
 mkdir build && cd build
-cmake .. -DENABLE_QT_TRANSLATION=ON -DGENERATE_QT_TRANSLATION=ON -DCMAKE_BUILD_TYPE=Release -DENABLE_SDL2=OFF -DENABLE_SCRIPTING=OFF
+cmake .. -DENABLE_QT_TRANSLATION=ON -DGENERATE_QT_TRANSLATION=ON -DCMAKE_BUILD_TYPE=Release -DENABLE_SDL2=OFF -DENABLE_SCRIPTING=OFF -DENABLE_FFMPEG=OFF
 make translation
 cd ..
 

CMakeLists.txt

@@ -20,10 +20,14 @@ option(ENABLE_WEB_SERVICE "Enable web services (telemetry, etc.)" ON)
 
 option(ENABLE_CUBEB "Enables the cubeb audio backend" ON)
 
+option(ENABLE_FFMPEG "Enable FFmpeg decoder/encoder" ON)
+
 option(USE_DISCORD_PRESENCE "Enables Discord Rich Presence" OFF)
 
 option(ENABLE_SCRIPTING "Enables scripting support" OFF)
 
+CMAKE_DEPENDENT_OPTION(CITRA_USE_BUNDLED_FFMPEG "Download bundled FFmpeg binaries" ON "MSVC" OFF)
+
 if(NOT EXISTS ${PROJECT_SOURCE_DIR}/.git/hooks/pre-commit)
     message(STATUS "Copying pre-commit hook")
     file(COPY hooks/pre-commit
@@ -253,6 +257,31 @@ if (ENABLE_QT)
     endif()
 endif()
 
+if (ENABLE_FFMPEG)
+    if (CITRA_USE_BUNDLED_FFMPEG)
+        if ((MSVC_VERSION GREATER_EQUAL 1910 AND MSVC_VERSION LESS 1920) AND ARCHITECTURE_x86_64)
+            set(FFmpeg_VER "ffmpeg-4.0.2-msvc")
+        else()
+            message(FATAL_ERROR "No bundled FFmpeg binaries for your toolchain. Disable CITRA_USE_BUNDLED_FFMPEG and provide your own.")
+        endif()
+
+        if (DEFINED FFmpeg_VER)
+            download_bundled_external("ffmpeg/" ${FFmpeg_VER} FFmpeg_PREFIX)
+            set(FFMPEG_DIR "${FFmpeg_PREFIX}")
+            set(FFMPEG_FOUND YES)
+        endif()
+    else()
+        find_package(FFmpeg REQUIRED COMPONENTS avcodec)
+        if ("${FFmpeg_avcodec_VERSION}" VERSION_LESS "57.48.101")
+            message(FATAL_ERROR "Found version for libavcodec is too low. The required version is at least 57.48.101 (included in FFmpeg 3.1 and later).")
+        else()
+            set(FFMPEG_FOUND YES)
+        endif()
+    endif()
+else()
+    set(FFMPEG_FOUND NO)
+endif()
+
 if (ENABLE_SCRIPTING)
     add_definitions(-DENABLE_SCRIPTING)
 endif()

appveyor.yml

@@ -26,7 +26,7 @@ install:
   - git submodule update --init --recursive
   - ps: |
         if ($env:BUILD_TYPE -eq 'mingw') {
-          $dependencies = "mingw64/mingw-w64-x86_64-qt5"
+          $dependencies = "mingw64/mingw-w64-x86_64-qt5 mingw64/mingw-w64-x86_64-ffmpeg"
           # redirect err to null to prevent warnings from becoming errors
           # workaround to prevent pacman from failing due to cyclical dependencies
           C:\msys64\usr\bin\bash -lc "pacman --noconfirm -S mingw64/mingw-w64-x86_64-freetype mingw64/mingw-w64-x86_64-fontconfig" 2> $null

externals/cmake-modules/FindFFmpeg.cmake

@@ -0,0 +1,183 @@
+# FindFFmpeg
+# ----------
+#
+# Find the native FFmpeg includes and libraries
+#
+# This module defines the following variables:
+#
+#  FFmpeg_INCLUDE_<component>: where to find <component>.h
+#  FFmpeg_LIBRARY_<component>: where to find the <component> library
+#  FFmpeg_INCLUDES: aggregate all the include paths
+#  FFmpeg_LIBRARIES: aggregate all the paths to the libraries
+#  FFmpeg_FOUND: True if all components have been found
+#
+# This module defines the following targets, which are prefered over variables:
+#
+#  FFmpeg::<component>: Target to use <component> directly, with include path,
+#    library and dependencies set up. If you are using a static build, you are
+#    responsible for adding any external dependencies (such as zlib, bzlib...).
+#
+# <component> can be one of:
+#   avcodec
+#   avdevice
+#   avfilter
+#   avformat
+#   postproc
+#   swresample
+#   swscale
+#
+
+set(_FFmpeg_ALL_COMPONENTS
+  avcodec
+  avdevice
+  avfilter
+  avformat
+  avutil
+  postproc
+  swresample
+  swscale
+)
+
+set(_FFmpeg_DEPS_avcodec avutil)
+set(_FFmpeg_DEPS_avdevice avcodec avformat avutil)
+set(_FFmpeg_DEPS_avfilter avutil)
+set(_FFmpeg_DEPS_avformat avcodec avutil)
+set(_FFmpeg_DEPS_postproc avutil)
+set(_FFmpeg_DEPS_swresample avutil)
+set(_FFmpeg_DEPS_swscale avutil)
+
+function(find_ffmpeg LIBNAME)
+  if(DEFINED ENV{FFMPEG_DIR})
+    set(FFMPEG_DIR $ENV{FFMPEG_DIR})
+  endif()
+
+  if(FFMPEG_DIR)
+    list(APPEND INCLUDE_PATHS
+      ${FFMPEG_DIR}
+      ${FFMPEG_DIR}/ffmpeg
+      ${FFMPEG_DIR}/lib${LIBNAME}
+      ${FFMPEG_DIR}/include/lib${LIBNAME}
+      ${FFMPEG_DIR}/include/ffmpeg
+      ${FFMPEG_DIR}/include
+      NO_DEFAULT_PATH
+      NO_CMAKE_FIND_ROOT_PATH
+    )
+    list(APPEND LIB_PATHS
+      ${FFMPEG_DIR}
+      ${FFMPEG_DIR}/lib
+      ${FFMPEG_DIR}/lib${LIBNAME}
+      NO_DEFAULT_PATH
+      NO_CMAKE_FIND_ROOT_PATH
+    )
+  else()
+    list(APPEND INCLUDE_PATHS
+      /usr/local/include/ffmpeg
+      /usr/local/include/lib${LIBNAME}
+      /usr/include/ffmpeg
+      /usr/include/lib${LIBNAME}
+      /usr/include/ffmpeg/lib${LIBNAME}
+    )
+
+    list(APPEND LIB_PATHS
+      /usr/local/lib
+      /usr/lib
+    )
+  endif()
+
+  find_path(FFmpeg_INCLUDE_${LIBNAME} lib${LIBNAME}/${LIBNAME}.h
+    HINTS ${INCLUDE_PATHS}
+  )
+
+  find_library(FFmpeg_LIBRARY_${LIBNAME} ${LIBNAME}
+    HINTS ${LIB_PATHS}
+  )
+
+  if(NOT FFMPEG_DIR AND (NOT FFmpeg_LIBRARY_${LIBNAME} OR NOT FFmpeg_INCLUDE_${LIBNAME}))
+    # Didn't find it in the usual paths, try pkg-config
+    find_package(PkgConfig QUIET)
+    pkg_check_modules(FFmpeg_PKGCONFIG_${LIBNAME} QUIET lib${LIBNAME})
+
+    find_path(FFmpeg_INCLUDE_${LIBNAME} lib${LIBNAME}/${LIBNAME}.h
+      ${FFmpeg_PKGCONFIG_${LIBNAME}_INCLUDE_DIRS}
+    )
+
+    find_library(FFmpeg_LIBRARY_${LIBNAME} ${LIBNAME}
+      ${FFmpeg_PKGCONFIG_${LIBNAME}_LIBRARY_DIRS}
+    )
+  endif()
+
+  if(FFmpeg_INCLUDE_${LIBNAME} AND FFmpeg_LIBRARY_${LIBNAME})
+    set(FFmpeg_INCLUDE_${LIBNAME} "${FFmpeg_INCLUDE_${LIBNAME}}" PARENT_SCOPE)
+    set(FFmpeg_LIBRARY_${LIBNAME} "${FFmpeg_LIBRARY_${LIBNAME}}" PARENT_SCOPE)
+
+    # Extract FFmpeg version from version.h
+    foreach(v MAJOR MINOR MICRO)
+      set(FFmpeg_${LIBNAME}_VERSION_${v} 0)
+    endforeach()
+    string(TOUPPER ${LIBNAME} LIBNAME_UPPER)
+    file(STRINGS "${FFmpeg_INCLUDE_${LIBNAME}}/lib${LIBNAME}/version.h" _FFmpeg_VERSION_H_CONTENTS REGEX "#define LIB${LIBNAME_UPPER}_VERSION_(MAJOR|MINOR|MICRO) ")
+    set(_FFmpeg_VERSION_REGEX "([0-9]+)")
+    foreach(v MAJOR MINOR MICRO)
+      if("${_FFmpeg_VERSION_H_CONTENTS}" MATCHES "#define LIB${LIBNAME_UPPER}_VERSION_${v}[\\t ]+${_FFmpeg_VERSION_REGEX}")
+        set(FFmpeg_${LIBNAME}_VERSION_${v} "${CMAKE_MATCH_1}")
+      endif()
+    endforeach()
+    set(FFmpeg_${LIBNAME}_VERSION "${FFmpeg_${LIBNAME}_VERSION_MAJOR}.${FFmpeg_${LIBNAME}_VERSION_MINOR}.${FFmpeg_${LIBNAME}_VERSION_MICRO}")
+    set(FFmpeg_${c}_VERSION "${FFmpeg_${LIBNAME}_VERSION}" PARENT_SCOPE)
+    unset(_FFmpeg_VERSION_REGEX)
+    unset(_FFmpeg_VERSION_H_CONTENTS)
+
+    set(FFmpeg_${c}_FOUND TRUE PARENT_SCOPE)
+    if(NOT FFmpeg_FIND_QUIETLY)
+      message("--  Found ${LIBNAME}: ${FFmpeg_INCLUDE_${LIBNAME}} ${FFmpeg_LIBRARY_${LIBNAME}} (version: ${FFmpeg_${LIBNAME}_VERSION})")
+    endif()
+  endif()
+endfunction()
+
+foreach(c ${_FFmpeg_ALL_COMPONENTS})
+  find_ffmpeg(${c})
+endforeach()
+
+foreach(c ${_FFmpeg_ALL_COMPONENTS})
+  if(FFmpeg_${c}_FOUND)
+    list(APPEND FFmpeg_INCLUDES ${FFmpeg_INCLUDE_${c}})
+    list(APPEND FFmpeg_LIBRARIES ${FFmpeg_LIBRARY_${c}})
+
+    add_library(FFmpeg::${c} IMPORTED UNKNOWN)
+    set_target_properties(FFmpeg::${c} PROPERTIES
+      IMPORTED_LOCATION ${FFmpeg_LIBRARY_${c}}
+      INTERFACE_INCLUDE_DIRECTORIES ${FFmpeg_INCLUDE_${c}}
+    )
+    if(_FFmpeg_DEPS_${c})
+      set(deps)
+      foreach(dep ${_FFmpeg_DEPS_${c}})
+        list(APPEND deps FFmpeg::${dep})
+      endforeach()
+
+      set_target_properties(FFmpeg::${c} PROPERTIES
+        INTERFACE_LINK_LIBRARIES "${deps}"
+      )
+      unset(deps)
+    endif()
+  endif()
+endforeach()
+
+if(FFmpeg_INCLUDES)
+  list(REMOVE_DUPLICATES FFmpeg_INCLUDES)
+endif()
+
+foreach(c ${FFmpeg_FIND_COMPONENTS})
+  list(APPEND _FFmpeg_REQUIRED_VARS FFmpeg_INCLUDE_${c} FFmpeg_LIBRARY_${c})
+endforeach()
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(FFmpeg
+  REQUIRED_VARS ${_FFmpeg_REQUIRED_VARS}
+  HANDLE_COMPONENTS
+)
+
+foreach(c ${_FFmpeg_ALL_COMPONENTS})
+  unset(_FFmpeg_DEPS_${c})
+endforeach()
+unset(_FFmpeg_ALL_COMPONENTS)
+unset(_FFmpeg_REQUIRED_VARS)

src/audio_core/CMakeLists.txt

@@ -5,6 +5,8 @@ add_library(audio_core STATIC
     dsp_interface.cpp
     dsp_interface.h
     hle/common.h
+    hle/decoder.cpp
+    hle/decoder.h
     hle/filter.cpp
     hle/filter.h
     hle/hle.cpp
@@ -25,6 +27,7 @@ add_library(audio_core STATIC
 
     $<$<BOOL:${SDL2_FOUND}>:sdl2_sink.cpp sdl2_sink.h>
     $<$<BOOL:${ENABLE_CUBEB}>:cubeb_sink.cpp cubeb_sink.h>
+    $<$<BOOL:${FFMPEG_FOUND}>:hle/aac_decoder.cpp hle/aac_decoder.h hle/ffmpeg_dl.h>
 )
 
 create_target_directory_groups(audio_core)
@@ -42,3 +45,12 @@ if(ENABLE_CUBEB)
     add_definitions(-DHAVE_CUBEB=1)
 endif()
 
+if(FFMPEG_FOUND)
+    if(UNIX)
+        target_link_libraries(audio_core PRIVATE FFmpeg::avcodec)
+    else()
+        target_include_directories(audio_core PRIVATE  ${FFMPEG_DIR}/include)
+    endif()
+    target_compile_definitions(audio_core PRIVATE HAVE_FFMPEG)
+endif()
+

src/audio_core/hle/aac_decoder.cpp

@@ -0,0 +1,241 @@
+// Copyright 2018 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "audio_core/hle/aac_decoder.h"
+#include "audio_core/hle/ffmpeg_dl.h"
+
+namespace AudioCore::HLE {
+
+class AACDecoder::Impl {
+public:
+    Impl(Memory::MemorySystem& memory);
+    ~Impl();
+    std::optional<BinaryResponse> ProcessRequest(const BinaryRequest& request);
+
+private:
+    std::optional<BinaryResponse> Initalize(const BinaryRequest& request);
+
+    void Clear();
+
+    std::optional<BinaryResponse> Decode(const BinaryRequest& request);
+
+    bool initalized;
+    bool have_ffmpeg_dl;
+
+    Memory::MemorySystem& memory;
+
+    AVCodec* codec;
+    AVCodecContext* av_context = nullptr;
+    AVCodecParserContext* parser = nullptr;
+    AVPacket* av_packet;
+    AVFrame* decoded_frame = nullptr;
+};
+
+AACDecoder::Impl::Impl(Memory::MemorySystem& memory) : memory(memory) {
+    initalized = false;
+
+    have_ffmpeg_dl = InitFFmpegDL();
+}
+
+AACDecoder::Impl::~Impl() {
+    if (initalized)
+        Clear();
+}
+
+std::optional<BinaryResponse> AACDecoder::Impl::ProcessRequest(const BinaryRequest& request) {
+    if (request.codec != DecoderCodec::AAC) {
+        LOG_ERROR(Audio_DSP, "Got wrong codec {}", static_cast<u16>(request.codec));
+        return {};
+    }
+
+    switch (request.cmd) {
+    case DecoderCommand::Init: {
+        return Initalize(request);
+        break;
+    }
+    case DecoderCommand::Decode: {
+        return Decode(request);
+        break;
+    }
+    case DecoderCommand::Unknown: {
+        BinaryResponse response;
+        std::memcpy(&response, &request, sizeof(response));
+        response.unknown1 = 0x0;
+        return response;
+        break;
+    }
+    default:
+        LOG_ERROR(Audio_DSP, "Got unknown binary request: {}", static_cast<u16>(request.cmd));
+        return {};
+        break;
+    }
+}
+
+std::optional<BinaryResponse> AACDecoder::Impl::Initalize(const BinaryRequest& request) {
+    if (initalized) {
+        Clear();
+    }
+
+    if (!have_ffmpeg_dl) {
+        return {};
+    }
+
+    av_packet = av_packet_alloc_dl();
+
+    codec = avcodec_find_decoder_dl(AV_CODEC_ID_AAC);
+    if (!codec) {
+        LOG_ERROR(Audio_DSP, "Codec not found\n");
+        return {};
+    }
+
+    parser = av_parser_init_dl(codec->id);
+    if (!parser) {
+        LOG_ERROR(Audio_DSP, "Parser not found\n");
+        return {};
+    }
+
+    av_context = avcodec_alloc_context3_dl(codec);
+    if (!av_context) {
+        LOG_ERROR(Audio_DSP, "Could not allocate audio codec context\n");
+        return {};
+    }
+
+    if (avcodec_open2_dl(av_context, codec, NULL) < 0) {
+        LOG_ERROR(Audio_DSP, "Could not open codec\n");
+        return {};
+    }
+
+    initalized = true;
+
+    BinaryResponse response;
+    std::memcpy(&response, &request, sizeof(response));
+    response.unknown1 = 0x0;
+    return response;
+}
+
+void AACDecoder::Impl::Clear() {
+    if (!have_ffmpeg_dl) {
+        return;
+    }
+
+    avcodec_free_context_dl(&av_context);
+    av_parser_close_dl(parser);
+    av_frame_free_dl(&decoded_frame);
+    av_packet_free_dl(&av_packet);
+}
+
+std::optional<BinaryResponse> AACDecoder::Impl::Decode(const BinaryRequest& request) {
+    if (!initalized) {
+        LOG_DEBUG(Audio_DSP, "Decoder not initalized");
+
+        // This is a hack to continue games that are not compiled with the aac codec
+        BinaryResponse response;
+        response.codec = request.codec;
+        response.cmd = request.cmd;
+        response.num_channels = 2;
+        response.num_samples = 1024;
+        response.size = request.size;
+        return response;
+    }
+
+    if (request.src_addr < Memory::FCRAM_PADDR) {
+        LOG_ERROR(Audio_DSP, "Got out of bounds src_addr {:08x}", request.src_addr);
+        return {};
+    }
+    u8* data = memory.GetFCRAMPointer(request.src_addr - Memory::FCRAM_PADDR);
+
+    std::array<std::vector<u8>, 2> out_streams;
+
+    std::size_t data_size = request.size;
+    while (data_size > 0) {
+        if (!decoded_frame) {
+            if (!(decoded_frame = av_frame_alloc_dl())) {
+                LOG_ERROR(Audio_DSP, "Could not allocate audio frame");
+                return {};
+            }
+        }
+
+        int ret = av_parser_parse2_dl(parser, av_context, &av_packet->data, &av_packet->size, data,
+                                      data_size, AV_NOPTS_VALUE, AV_NOPTS_VALUE, 0);
+        if (ret < 0) {
+            LOG_ERROR(Audio_DSP, "Error while parsing");
+            return {};
+        }
+        data += ret;
+        data_size -= ret;
+
+        ret = avcodec_send_packet_dl(av_context, av_packet);
+        if (ret < 0) {
+            LOG_ERROR(Audio_DSP, "Error submitting the packet to the decoder");
+            return {};
+        }
+
+        if (av_packet->size) {
+            while (ret >= 0) {
+                ret = avcodec_receive_frame_dl(av_context, decoded_frame);
+                if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
+                    break;
+                else if (ret < 0) {
+                    LOG_ERROR(Audio_DSP, "Error during decoding");
+                    return {};
+                }
+                int bytes_per_sample = av_get_bytes_per_sample_dl(av_context->sample_fmt);
+                if (bytes_per_sample < 0) {
+                    LOG_ERROR(Audio_DSP, "Failed to calculate data size");
+                    return {};
+                }
+
+                ASSERT(decoded_frame->channels == out_streams.size());
+
+                std::size_t size = bytes_per_sample * (decoded_frame->nb_samples);
+
+                // FFmpeg converts to 32 signed floating point PCM, we need s32 PCM so we need to
+                // convert it
+                f32 val_float;
+                for (std::size_t current_pos(0); current_pos < size;) {
+                    for (std::size_t channel(0); channel < out_streams.size(); channel++) {
+                        std::memcpy(&val_float, decoded_frame->data[0] + current_pos,
+                                    sizeof(val_float));
+                        s16 val = static_cast<s16>(0x7FFF * val_float);
+                        out_streams[channel].push_back(val & 0xFF);
+                        out_streams[channel].push_back(val >> 8);
+                    }
+                    current_pos += sizeof(val_float);
+                }
+            }
+        }
+    }
+
+    if (request.dst_addr_ch0 < Memory::FCRAM_PADDR) {
+        LOG_ERROR(Audio_DSP, "Got out of bounds dst_addr_ch0 {:08x}", request.dst_addr_ch0);
+        return {};
+    }
+    std::memcpy(memory.GetFCRAMPointer(request.dst_addr_ch0 - Memory::FCRAM_PADDR),
+                out_streams[0].data(), out_streams[0].size());
+
+    if (request.dst_addr_ch1 < Memory::FCRAM_PADDR) {
+        LOG_ERROR(Audio_DSP, "Got out of bounds dst_addr_ch1 {:08x}", request.dst_addr_ch1);
+        return {};
+    }
+    std::memcpy(memory.GetFCRAMPointer(request.dst_addr_ch1 - Memory::FCRAM_PADDR),
+                out_streams[1].data(), out_streams[1].size());
+
+    BinaryResponse response;
+    response.codec = request.codec;
+    response.cmd = request.cmd;
+    response.num_channels = 2;
+    response.num_samples = decoded_frame->nb_samples;
+    response.size = request.size;
+    return response;
+}
+
+AACDecoder::AACDecoder(Memory::MemorySystem& memory) : impl(std::make_unique<Impl>(memory)) {}
+
+AACDecoder::~AACDecoder() = default;
+
+std::optional<BinaryResponse> AACDecoder::ProcessRequest(const BinaryRequest& request) {
+    return impl->ProcessRequest(request);
+}
+
+} // namespace AudioCore::HLE

src/audio_core/hle/aac_decoder.h

@@ -0,0 +1,22 @@
+// Copyright 2018 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "audio_core/hle/decoder.h"
+
+namespace AudioCore::HLE {
+
+class AACDecoder final : public DecoderBase {
+public:
+    AACDecoder(Memory::MemorySystem& memory);
+    ~AACDecoder() override;
+    std::optional<BinaryResponse> ProcessRequest(const BinaryRequest& request) override;
+
+private:
+    class Impl;
+    std::unique_ptr<Impl> impl;
+};
+
+} // namespace AudioCore::HLE

src/audio_core/hle/decoder.cpp

@@ -0,0 +1,36 @@
+// Copyright 2018 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "audio_core/hle/decoder.h"
+
+namespace AudioCore::HLE {
+
+NullDecoder::NullDecoder() {}
+
+NullDecoder::~NullDecoder() = default;
+
+std::optional<BinaryResponse> NullDecoder::ProcessRequest(const BinaryRequest& request) {
+    BinaryResponse response;
+    switch (request.cmd) {
+    case DecoderCommand::Init:
+    case DecoderCommand::Unknown:
+        std::memcpy(&response, &request, sizeof(response));
+        response.unknown1 = 0x0;
+        return response;
+        break;
+    case DecoderCommand::Decode:
+        response.codec = request.codec;
+        response.cmd = DecoderCommand::Decode;
+        response.num_channels = 2; // Just assume stereo here
+        response.size = request.size;
+        response.num_samples = 1024; // Just assume 1024 here
+        return response;
+        break;
+    default:
+        LOG_ERROR(Audio_DSP, "Got unknown binary request: {}", static_cast<u16>(request.cmd));
+        return {};
+        break;
+    }
+};
+} // namespace AudioCore::HLE

src/audio_core/hle/decoder.h

@@ -0,0 +1,68 @@
+// Copyright 2018 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include <optional>
+#include <vector>
+#include "common/common_types.h"
+#include "common/swap.h"
+#include "core/core.h"
+
+namespace AudioCore::HLE {
+
+enum class DecoderCommand : u16 {
+    Init,
+    Decode,
+    Unknown,
+};
+
+enum class DecoderCodec : u16 {
+    None,
+    AAC,
+};
+
+struct BinaryRequest {
+    enum_le<DecoderCodec> codec =
+        DecoderCodec::None; // this is a guess. until now only 0x1 was observed here
+    enum_le<DecoderCommand> cmd = DecoderCommand::Init;
+    u32_le fixed = 0;
+    u32_le src_addr = 0;
+    u32_le size = 0;
+    u32_le dst_addr_ch0 = 0;
+    u32_le dst_addr_ch1 = 0;
+    u32_le unknown1 = 0;
+    u32_le unknown2 = 0;
+};
+static_assert(sizeof(BinaryRequest) == 32, "Unexpected struct size for BinaryRequest");
+
+struct BinaryResponse {
+    enum_le<DecoderCodec> codec =
+        DecoderCodec::None; // this could be something else. until now only 0x1 was observed here
+    enum_le<DecoderCommand> cmd = DecoderCommand::Init;
+    u32_le unknown1 = 0;
+    u32_le unknown2 = 0;
+    u32_le num_channels = 0; // this is a guess, so far I only observed 2 here
+    u32_le size = 0;
+    u32_le unknown3 = 0;
+    u32_le unknown4 = 0;
+    u32_le num_samples = 0; // this is a guess, so far I only observed 1024 here
+};
+static_assert(sizeof(BinaryResponse) == 32, "Unexpected struct size for BinaryResponse");
+
+class DecoderBase {
+public:
+    virtual ~DecoderBase(){};
+    virtual std::optional<BinaryResponse> ProcessRequest(const BinaryRequest& request) = 0;
+};
+
+class NullDecoder final : public DecoderBase {
+public:
+    NullDecoder();
+    ~NullDecoder() override;
+    std::optional<BinaryResponse> ProcessRequest(const BinaryRequest& request) override;
+};
+
+} // namespace AudioCore::HLE

src/audio_core/hle/ffmpeg_dl.h

@@ -0,0 +1,213 @@
+// Copyright 2018 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#ifdef _WIN32
+#include <windows.h>
+#endif
+
+#include "common/logging/log.h"
+
+extern "C" {
+#include "libavcodec/avcodec.h"
+}
+
+#ifdef _WIN32
+
+template <typename T>
+struct FuncDL {
+    FuncDL() = default;
+    FuncDL(HMODULE dll, const char* name) {
+        ptr_function = nullptr;
+        if (dll) {
+            *(void**)&ptr_function = (void*)GetProcAddress(dll, name);
+        }
+    }
+
+    operator T*() const {
+        return ptr_function;
+    }
+
+    operator bool() const {
+        return ptr_function != nullptr;
+    }
+
+    T* ptr_function = nullptr;
+    ;
+};
+
+FuncDL<int(AVSampleFormat)> av_get_bytes_per_sample_dl;
+FuncDL<AVFrame*(void)> av_frame_alloc_dl;
+FuncDL<void(AVFrame**)> av_frame_free_dl;
+FuncDL<AVCodecContext*(const AVCodec*)> avcodec_alloc_context3_dl;
+FuncDL<void(AVCodecContext**)> avcodec_free_context_dl;
+FuncDL<int(AVCodecContext*, const AVCodec*, AVDictionary**)> avcodec_open2_dl;
+FuncDL<AVPacket*(void)> av_packet_alloc_dl;
+FuncDL<void(AVPacket**)> av_packet_free_dl;
+FuncDL<AVCodec*(AVCodecID)> avcodec_find_decoder_dl;
+FuncDL<int(AVCodecContext*, const AVPacket*)> avcodec_send_packet_dl;
+FuncDL<int(AVCodecContext*, AVFrame*)> avcodec_receive_frame_dl;
+FuncDL<AVCodecParserContext*(int)> av_parser_init_dl;
+FuncDL<int(AVCodecParserContext*, AVCodecContext*, uint8_t**, int*, const uint8_t*, int, int64_t,
+           int64_t, int64_t)>
+    av_parser_parse2_dl;
+FuncDL<void(AVCodecParserContext*)> av_parser_close_dl;
+
+bool InitFFmpegDL() {
+    HMODULE dll_util = nullptr;
+    dll_util = LoadLibrary("avutil-56.dll");
+    if (!dll_util) {
+        DWORD errorMessageID = GetLastError();
+        LPSTR messageBuffer = nullptr;
+        size_t size =
+            FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM |
+                               FORMAT_MESSAGE_IGNORE_INSERTS,
+                           NULL, errorMessageID, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+                           (LPSTR)&messageBuffer, 0, NULL);
+
+        std::string message(messageBuffer, size);
+
+        // Free the buffer.
+        LocalFree(messageBuffer);
+        LOG_ERROR(Audio_DSP, "Could not load avcodec-58.dll: {}", message);
+        return false;
+    }
+
+    HMODULE dll_codec = nullptr;
+    dll_codec = LoadLibrary("avcodec-58.dll");
+    if (!dll_codec) {
+        DWORD errorMessageID = GetLastError();
+        LPSTR messageBuffer = nullptr;
+        size_t size =
+            FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM |
+                               FORMAT_MESSAGE_IGNORE_INSERTS,
+                           NULL, errorMessageID, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+                           (LPSTR)&messageBuffer, 0, NULL);
+
+        std::string message(messageBuffer, size);
+
+        // Free the buffer.
+        LocalFree(messageBuffer);
+        LOG_ERROR(Audio_DSP, "Could not load avcodec-58.dll: {}", message);
+        return false;
+    }
+    av_get_bytes_per_sample_dl = FuncDL<int(AVSampleFormat)>(dll_util, "av_get_bytes_per_sample");
+    if (!av_get_bytes_per_sample_dl) {
+        LOG_ERROR(Audio_DSP, "Can not load function av_get_bytes_per_sample");
+        return false;
+    }
+
+    av_frame_alloc_dl = FuncDL<AVFrame*()>(dll_util, "av_frame_alloc");
+    if (!av_frame_alloc_dl) {
+        LOG_ERROR(Audio_DSP, "Can not load function av_frame_alloc");
+        return false;
+    }
+
+    av_frame_free_dl = FuncDL<void(AVFrame**)>(dll_util, "av_frame_free");
+    if (!av_frame_free_dl) {
+        LOG_ERROR(Audio_DSP, "Can not load function av_frame_free");
+        return false;
+    }
+
+    avcodec_alloc_context3_dl =
+        FuncDL<AVCodecContext*(const AVCodec*)>(dll_codec, "avcodec_alloc_context3");
+    if (!avcodec_alloc_context3_dl) {
+        LOG_ERROR(Audio_DSP, "Can not load function avcodec_alloc_context3");
+        return false;
+    }
+
+    avcodec_free_context_dl = FuncDL<void(AVCodecContext**)>(dll_codec, "avcodec_free_context");
+    if (!av_get_bytes_per_sample_dl) {
+        LOG_ERROR(Audio_DSP, "Can not load function avcodec_free_context");
+        return false;
+    }
+
+    avcodec_open2_dl =
+        FuncDL<int(AVCodecContext*, const AVCodec*, AVDictionary**)>(dll_codec, "avcodec_open2");
+    if (!avcodec_open2_dl) {
+        LOG_ERROR(Audio_DSP, "Can not load function avcodec_open2");
+        return false;
+    }
+    av_packet_alloc_dl = FuncDL<AVPacket*(void)>(dll_codec, "av_packet_alloc");
+    if (!av_packet_alloc_dl) {
+        LOG_ERROR(Audio_DSP, "Can not load function av_packet_alloc");
+        return false;
+    }
+
+    av_packet_free_dl = FuncDL<void(AVPacket**)>(dll_codec, "av_packet_free");
+    if (!av_packet_free_dl) {
+        LOG_ERROR(Audio_DSP, "Can not load function av_packet_free");
+        return false;
+    }
+
+    avcodec_find_decoder_dl = FuncDL<AVCodec*(AVCodecID)>(dll_codec, "avcodec_find_decoder");
+    if (!avcodec_find_decoder_dl) {
+        LOG_ERROR(Audio_DSP, "Can not load function avcodec_find_decoder");
+        return false;
+    }
+
+    avcodec_send_packet_dl =
+        FuncDL<int(AVCodecContext*, const AVPacket*)>(dll_codec, "avcodec_send_packet");
+    if (!avcodec_send_packet_dl) {
+        LOG_ERROR(Audio_DSP, "Can not load function avcodec_send_packet");
+        return false;
+    }
+
+    avcodec_receive_frame_dl =
+        FuncDL<int(AVCodecContext*, AVFrame*)>(dll_codec, "avcodec_receive_frame");
+    if (!avcodec_receive_frame_dl) {
+        LOG_ERROR(Audio_DSP, "Can not load function avcodec_receive_frame");
+        return false;
+    }
+
+    av_parser_init_dl = FuncDL<AVCodecParserContext*(int)>(dll_codec, "av_parser_init");
+    if (!av_parser_init_dl) {
+        LOG_ERROR(Audio_DSP, "Can not load function av_parser_init");
+        return false;
+    }
+
+    av_parser_parse2_dl =
+        FuncDL<int(AVCodecParserContext*, AVCodecContext*, uint8_t**, int*, const uint8_t*, int,
+                   int64_t, int64_t, int64_t)>(dll_codec, "av_parser_parse2");
+    if (!av_parser_parse2_dl) {
+        LOG_ERROR(Audio_DSP, "Can not load function av_parser_parse2");
+        return false;
+    }
+
+    av_parser_close_dl = FuncDL<void(AVCodecParserContext*)>(dll_codec, "av_parser_close");
+    if (!av_parser_close_dl) {
+        LOG_ERROR(Audio_DSP, "Can not load function av_parser_close");
+        return false;
+    }
+
+    return true;
+}
+
+#endif // _Win32
+
+#if defined(__APPLE__) || defined(__linux__)
+
+// No dynamic loading for Unix and Apple
+
+const auto av_get_bytes_per_sample_dl = &av_get_bytes_per_sample;
+const auto av_frame_alloc_dl = &av_frame_alloc;
+const auto av_frame_free_dl = &av_frame_free;
+const auto avcodec_alloc_context3_dl = &avcodec_alloc_context3;
+const auto avcodec_free_context_dl = &avcodec_free_context;
+const auto avcodec_open2_dl = &avcodec_open2;
+const auto av_packet_alloc_dl = &av_packet_alloc;
+const auto av_packet_free_dl = &av_packet_free;
+const auto avcodec_find_decoder_dl = &avcodec_find_decoder;
+const auto avcodec_send_packet_dl = &avcodec_send_packet;
+const auto avcodec_receive_frame_dl = &avcodec_receive_frame;
+const auto av_parser_init_dl = &av_parser_init;
+const auto av_parser_parse2_dl = &av_parser_parse2;
+const auto av_parser_close_dl = &av_parser_close;
+
+bool InitFFmpegDL() {
+    return true;
+}
+
+#endif // defined(__APPLE__) || defined(__linux__)

src/audio_core/hle/hle.cpp

@@ -3,7 +3,11 @@
 // Refer to the license.txt file included.
 
 #include "audio_core/audio_types.h"
+#ifdef HAVE_FFMPEG
+#include "audio_core/hle/aac_decoder.h"
+#endif
 #include "audio_core/hle/common.h"
+#include "audio_core/hle/decoder.h"
 #include "audio_core/hle/hle.h"
 #include "audio_core/hle/mixers.h"
 #include "audio_core/hle/shared_memory.h"
@@ -66,6 +70,8 @@ private:
     DspHle& parent;
     Core::TimingEventType* tick_event;
 
+    std::unique_ptr<HLE::DecoderBase> decoder;
+
     std::weak_ptr<DSP_DSP> dsp_dsp;
 };
 
@@ -76,6 +82,13 @@ DspHle::Impl::Impl(DspHle& parent_, Memory::MemorySystem& memory) : parent(paren
         source.SetMemory(memory);
     }
 
+#ifdef HAVE_FFMPEG
+    decoder = std::make_unique<HLE::AACDecoder>(memory);
+#else
+    LOG_WARNING(Audio_DSP, "FFmpeg missing, this could lead to missing audio");
+    decoder = std::make_unique<HLE::NullDecoder>();
+#endif // HAVE_FFMPEG
+
     Core::Timing& timing = Core::System::GetInstance().CoreTiming();
     tick_event =
         timing.RegisterEvent("AudioCore::DspHle::tick_event", [this](u64, s64 cycles_late) {
@@ -189,6 +202,28 @@ void DspHle::Impl::PipeWrite(DspPipe pipe_number, const std::vector<u8>& buffer)
 
         return;
     }
+    case DspPipe::Binary: {
+        // TODO(B3N30): Make this async, and signal the interrupt
+        HLE::BinaryRequest request;
+        if (sizeof(request) != buffer.size()) {
+            LOG_CRITICAL(Audio_DSP, "got binary pipe with wrong size {}", buffer.size());
+            UNIMPLEMENTED();
+            return;
+        }
+        std::memcpy(&request, buffer.data(), buffer.size());
+        if (request.codec != HLE::DecoderCodec::AAC) {
+            LOG_CRITICAL(Audio_DSP, "got unknown codec {}", static_cast<u16>(request.codec));
+            UNIMPLEMENTED();
+            return;
+        }
+        std::optional<HLE::BinaryResponse> response = decoder->ProcessRequest(request);
+        if (response) {
+            const HLE::BinaryResponse& value = *response;
+            pipe_data[static_cast<u32>(pipe_number)].resize(sizeof(value));
+            std::memcpy(pipe_data[static_cast<u32>(pipe_number)].data(), &value, sizeof(value));
+        }
+        break;
+    }
     default:
         LOG_CRITICAL(Audio_DSP, "pipe_number = {} unimplemented",
                      static_cast<std::size_t>(pipe_number));