diff --git a/src/core/libraries/audio/audioout.cpp b/src/core/libraries/audio/audioout.cpp
index 78b04cc9..db43ee92 100644
--- a/src/core/libraries/audio/audioout.cpp
+++ b/src/core/libraries/audio/audioout.cpp
@@ -2,6 +2,8 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #include <memory>
+#include <mutex>
+#include <shared_mutex>
 #include <magic_enum/magic_enum.hpp>
 
 #include "common/assert.h"
@@ -13,7 +15,22 @@
 
 namespace Libraries::AudioOut {
 
-static std::unique_ptr<SDLAudioOut> audio;
+struct PortOut {
+    void* impl;
+    u32 samples_num;
+    u32 freq;
+    OrbisAudioOutParamFormat format;
+    OrbisAudioOutPort type;
+    int channels_num;
+    bool is_float;
+    std::array<int, 8> volume;
+    u8 sample_size;
+    bool is_open;
+};
+std::shared_mutex ports_mutex;
+std::array<PortOut, SCE_AUDIO_OUT_NUM_PORTS> ports_out{};
+
+static std::unique_ptr<AudioOutBackend> audio;
 
 static std::string_view GetAudioOutPort(OrbisAudioOutPort port) {
     switch (port) {
@@ -70,6 +87,58 @@ static std::string_view GetAudioOutParamAttr(OrbisAudioOutParamAttr attr) {
     }
 }
 
+static bool IsFormatFloat(const OrbisAudioOutParamFormat format) {
+    switch (format) {
+    case OrbisAudioOutParamFormat::S16Mono:
+    case OrbisAudioOutParamFormat::S16Stereo:
+    case OrbisAudioOutParamFormat::S16_8CH:
+    case OrbisAudioOutParamFormat::S16_8CH_Std:
+        return false;
+    case OrbisAudioOutParamFormat::FloatMono:
+    case OrbisAudioOutParamFormat::FloatStereo:
+    case OrbisAudioOutParamFormat::Float_8CH:
+    case OrbisAudioOutParamFormat::Float_8CH_Std:
+        return true;
+    default:
+        UNREACHABLE_MSG("Unknown format");
+    }
+}
+
+static int GetFormatNumChannels(const OrbisAudioOutParamFormat format) {
+    switch (format) {
+    case OrbisAudioOutParamFormat::S16Mono:
+    case OrbisAudioOutParamFormat::FloatMono:
+        return 1;
+    case OrbisAudioOutParamFormat::S16Stereo:
+    case OrbisAudioOutParamFormat::FloatStereo:
+        return 2;
+    case OrbisAudioOutParamFormat::S16_8CH:
+    case OrbisAudioOutParamFormat::Float_8CH:
+    case OrbisAudioOutParamFormat::S16_8CH_Std:
+    case OrbisAudioOutParamFormat::Float_8CH_Std:
+        return 8;
+    default:
+        UNREACHABLE_MSG("Unknown format");
+    }
+}
+
+static u8 GetFormatSampleSize(const OrbisAudioOutParamFormat format) {
+    switch (format) {
+    case OrbisAudioOutParamFormat::S16Mono:
+    case OrbisAudioOutParamFormat::S16Stereo:
+    case OrbisAudioOutParamFormat::S16_8CH:
+    case OrbisAudioOutParamFormat::S16_8CH_Std:
+        return 2;
+    case OrbisAudioOutParamFormat::FloatMono:
+    case OrbisAudioOutParamFormat::FloatStereo:
+    case OrbisAudioOutParamFormat::Float_8CH:
+    case OrbisAudioOutParamFormat::Float_8CH_Std:
+        return 4;
+    default:
+        UNREACHABLE_MSG("Unknown format");
+    }
+}
+
 int PS4_SYSV_ABI sceAudioOutDeviceIdOpen() {
     LOG_ERROR(Lib_AudioOut, "(STUBBED) called");
     return ORBIS_OK;
@@ -110,8 +179,21 @@ int PS4_SYSV_ABI sceAudioOutChangeAppModuleState() {
     return ORBIS_OK;
 }
 
-int PS4_SYSV_ABI sceAudioOutClose() {
-    LOG_ERROR(Lib_AudioOut, "(STUBBED) called");
+int PS4_SYSV_ABI sceAudioOutClose(s32 handle) {
+    LOG_INFO(Lib_AudioOut, "handle = {}", handle);
+    if (handle < 1 || handle > SCE_AUDIO_OUT_NUM_PORTS) {
+        return ORBIS_AUDIO_OUT_ERROR_INVALID_PORT;
+    }
+
+    std::scoped_lock lock(ports_mutex);
+    auto& port = ports_out.at(handle - 1);
+    if (!port.is_open) {
+        return ORBIS_AUDIO_OUT_ERROR_INVALID_PORT;
+    }
+
+    audio->Close(port.impl);
+    port.impl = nullptr;
+    port.is_open = false;
     return ORBIS_OK;
 }
 
@@ -180,16 +262,21 @@ int PS4_SYSV_ABI sceAudioOutGetPortState(s32 handle, OrbisAudioOutPortState* sta
         return ORBIS_AUDIO_OUT_ERROR_INVALID_PORT;
     }
 
-    const auto [type, channels_num] = audio->GetStatus(handle);
+    std::scoped_lock lock(ports_mutex);
+    const auto& port = ports_out.at(handle - 1);
+    if (!port.is_open) {
+        return ORBIS_AUDIO_OUT_ERROR_INVALID_PORT;
+    }
+
     state->rerouteCounter = 0;
     state->volume = 127;
 
-    switch (type) {
+    switch (port.type) {
     case OrbisAudioOutPort::Main:
     case OrbisAudioOutPort::Bgm:
     case OrbisAudioOutPort::Voice:
         state->output = 1;
-        state->channel = (channels_num > 2 ? 2 : channels_num);
+        state->channel = port.channels_num > 2 ? 2 : port.channels_num;
         break;
     case OrbisAudioOutPort::Personal:
     case OrbisAudioOutPort::Padspk:
@@ -276,7 +363,7 @@ s32 PS4_SYSV_ABI sceAudioOutOpen(UserService::OrbisUserServiceUserId user_id,
                                  u32 sample_rate,
                                  OrbisAudioOutParamExtendedInformation param_type) {
     LOG_INFO(Lib_AudioOut,
-             "AudioOutOpen id = {} port_type = {} index = {} lenght= {} sample_rate = {} "
+             "id = {} port_type = {} index = {} length = {} sample_rate = {} "
              "param_type = {} attr = {}",
              user_id, GetAudioOutPort(port_type), index, length, sample_rate,
              GetAudioOutParamFormat(param_type.data_format),
@@ -310,7 +397,26 @@ s32 PS4_SYSV_ABI sceAudioOutOpen(UserService::OrbisUserServiceUserId user_id,
         LOG_ERROR(Lib_AudioOut, "Invalid format attribute");
         return ORBIS_AUDIO_OUT_ERROR_INVALID_FORMAT;
     }
-    return audio->Open(port_type, length, sample_rate, format);
+
+    std::scoped_lock lock{ports_mutex};
+    const auto port = std::ranges::find(ports_out, false, &PortOut::is_open);
+    if (port == ports_out.end()) {
+        LOG_ERROR(Lib_AudioOut, "Audio ports are full");
+        return ORBIS_AUDIO_OUT_ERROR_PORT_FULL;
+    }
+
+    port->is_open = true;
+    port->type = port_type;
+    port->samples_num = length;
+    port->freq = sample_rate;
+    port->format = format;
+    port->is_float = IsFormatFloat(format);
+    port->channels_num = GetFormatNumChannels(format);
+    port->sample_size = GetFormatSampleSize(format);
+    port->volume.fill(SCE_AUDIO_OUT_VOLUME_0DB);
+
+    port->impl = audio->Open(port->is_float, port->channels_num, port->freq);
+    return std::distance(ports_out.begin(), port) + 1;
 }
 
 int PS4_SYSV_ABI sceAudioOutOpenEx() {
@@ -326,7 +432,15 @@ s32 PS4_SYSV_ABI sceAudioOutOutput(s32 handle, const void* ptr) {
         // Nothing to output
         return ORBIS_OK;
     }
-    return audio->Output(handle, ptr);
+
+    auto& port = ports_out.at(handle - 1);
+    if (!port.is_open) {
+        return ORBIS_AUDIO_OUT_ERROR_INVALID_PORT;
+    }
+
+    const size_t data_size = port.samples_num * port.sample_size * port.channels_num;
+    audio->Output(port.impl, ptr, data_size);
+    return ORBIS_OK;
 }
 
 int PS4_SYSV_ABI sceAudioOutOutputs(OrbisAudioOutOutputParam* param, u32 num) {
@@ -431,7 +545,42 @@ s32 PS4_SYSV_ABI sceAudioOutSetVolume(s32 handle, s32 flag, s32* vol) {
     if (handle < 1 || handle > SCE_AUDIO_OUT_NUM_PORTS) {
         return ORBIS_AUDIO_OUT_ERROR_INVALID_PORT;
     }
-    return audio->SetVolume(handle, flag, vol);
+
+    std::scoped_lock lock(ports_mutex);
+    auto& port = ports_out.at(handle - 1);
+    if (!port.is_open) {
+        return ORBIS_AUDIO_OUT_ERROR_INVALID_PORT;
+    }
+
+    for (int i = 0; i < port.channels_num; i++, flag >>= 1u) {
+        auto bit = flag & 0x1u;
+        if (bit == 1) {
+            int src_index = i;
+            if (port.format == OrbisAudioOutParamFormat::Float_8CH_Std ||
+                port.format == OrbisAudioOutParamFormat::S16_8CH_Std) {
+                switch (i) {
+                case 4:
+                    src_index = 6;
+                    break;
+                case 5:
+                    src_index = 7;
+                    break;
+                case 6:
+                    src_index = 4;
+                    break;
+                case 7:
+                    src_index = 5;
+                    break;
+                default:
+                    break;
+                }
+            }
+            port.volume[i] = vol[src_index];
+        }
+    }
+
+    audio->SetVolume(port.impl, port.volume);
+    return ORBIS_OK;
 }
 
 int PS4_SYSV_ABI sceAudioOutSetVolumeDown() {
diff --git a/src/core/libraries/audio/audioout.h b/src/core/libraries/audio/audioout.h
index e8e718b8..c66a0e9f 100644
--- a/src/core/libraries/audio/audioout.h
+++ b/src/core/libraries/audio/audioout.h
@@ -64,7 +64,7 @@ int PS4_SYSV_ABI sceAudioOutA3dExit();
 int PS4_SYSV_ABI sceAudioOutA3dInit();
 int PS4_SYSV_ABI sceAudioOutAttachToApplicationByPid();
 int PS4_SYSV_ABI sceAudioOutChangeAppModuleState();
-int PS4_SYSV_ABI sceAudioOutClose();
+int PS4_SYSV_ABI sceAudioOutClose(s32 handle);
 int PS4_SYSV_ABI sceAudioOutDetachFromApplicationByPid();
 int PS4_SYSV_ABI sceAudioOutExConfigureOutputMode();
 int PS4_SYSV_ABI sceAudioOutExGetSystemInfo();
diff --git a/src/core/libraries/audio/audioout_backend.h b/src/core/libraries/audio/audioout_backend.h
new file mode 100644
index 00000000..238ef020
--- /dev/null
+++ b/src/core/libraries/audio/audioout_backend.h
@@ -0,0 +1,19 @@
+// SPDX-FileCopyrightText: Copyright 2024 shadPS4 Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+namespace Libraries::AudioOut {
+
+class AudioOutBackend {
+public:
+    AudioOutBackend() = default;
+    virtual ~AudioOutBackend() = default;
+
+    virtual void* Open(bool is_float, int num_channels, u32 sample_rate) = 0;
+    virtual void Close(void* impl) = 0;
+    virtual void Output(void* impl, const void* ptr, size_t size) = 0;
+    virtual void SetVolume(void* impl, std::array<int, 8> ch_volumes) = 0;
+};
+
+} // namespace Libraries::AudioOut
diff --git a/src/core/libraries/audio/sdl_audio.cpp b/src/core/libraries/audio/sdl_audio.cpp
index 8cc823ab..ce385ad9 100644
--- a/src/core/libraries/audio/sdl_audio.cpp
+++ b/src/core/libraries/audio/sdl_audio.cpp
@@ -1,141 +1,44 @@
 // SPDX-FileCopyrightText: Copyright 2024 shadPS4 Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
-#include <mutex>
 #include <SDL3/SDL_audio.h>
 #include <SDL3/SDL_init.h>
 #include <SDL3/SDL_timer.h>
 
 #include "common/assert.h"
-#include "core/libraries/audio/audioout_error.h"
 #include "core/libraries/audio/sdl_audio.h"
 
 namespace Libraries::AudioOut {
 
 constexpr int AUDIO_STREAM_BUFFER_THRESHOLD = 65536; // Define constant for buffer threshold
 
-s32 SDLAudioOut::Open(OrbisAudioOutPort type, u32 samples_num, u32 freq,
-                      OrbisAudioOutParamFormat format) {
-    std::scoped_lock lock{m_mutex};
-    const auto port = std::ranges::find(ports_out, false, &PortOut::is_open);
-    if (port == ports_out.end()) {
-        LOG_ERROR(Lib_AudioOut, "Audio ports are full");
-        return ORBIS_AUDIO_OUT_ERROR_PORT_FULL;
-    }
-
-    port->is_open = true;
-    port->type = type;
-    port->samples_num = samples_num;
-    port->freq = freq;
-    port->format = format;
-    SDL_AudioFormat sampleFormat;
-    switch (format) {
-    case OrbisAudioOutParamFormat::S16Mono:
-        sampleFormat = SDL_AUDIO_S16;
-        port->channels_num = 1;
-        port->sample_size = 2;
-        break;
-    case OrbisAudioOutParamFormat::FloatMono:
-        sampleFormat = SDL_AUDIO_F32;
-        port->channels_num = 1;
-        port->sample_size = 4;
-        break;
-    case OrbisAudioOutParamFormat::S16Stereo:
-        sampleFormat = SDL_AUDIO_S16;
-        port->channels_num = 2;
-        port->sample_size = 2;
-        break;
-    case OrbisAudioOutParamFormat::FloatStereo:
-        sampleFormat = SDL_AUDIO_F32;
-        port->channels_num = 2;
-        port->sample_size = 4;
-        break;
-    case OrbisAudioOutParamFormat::S16_8CH:
-        sampleFormat = SDL_AUDIO_S16;
-        port->channels_num = 8;
-        port->sample_size = 2;
-        break;
-    case OrbisAudioOutParamFormat::Float_8CH:
-        sampleFormat = SDL_AUDIO_F32;
-        port->channels_num = 8;
-        port->sample_size = 4;
-        break;
-    case OrbisAudioOutParamFormat::S16_8CH_Std:
-        sampleFormat = SDL_AUDIO_S16;
-        port->channels_num = 8;
-        port->sample_size = 2;
-        break;
-    case OrbisAudioOutParamFormat::Float_8CH_Std:
-        sampleFormat = SDL_AUDIO_F32;
-        port->channels_num = 8;
-        port->sample_size = 4;
-        break;
-    default:
-        UNREACHABLE_MSG("Unknown format");
-    }
-
-    port->volume.fill(Libraries::AudioOut::SCE_AUDIO_OUT_VOLUME_0DB);
-
+void* SDLAudioOut::Open(bool is_float, int num_channels, u32 sample_rate) {
     SDL_AudioSpec fmt;
     SDL_zero(fmt);
-    fmt.format = sampleFormat;
-    fmt.channels = port->channels_num;
-    fmt.freq = freq;
-    port->stream = SDL_OpenAudioDeviceStream(SDL_AUDIO_DEVICE_DEFAULT_PLAYBACK, &fmt, NULL, NULL);
-    SDL_ResumeAudioDevice(SDL_GetAudioStreamDevice(port->stream));
-    return std::distance(ports_out.begin(), port) + 1;
+    fmt.format = is_float ? SDL_AUDIO_F32 : SDL_AUDIO_S16;
+    fmt.channels = num_channels;
+    fmt.freq = sample_rate;
+
+    auto* stream =
+        SDL_OpenAudioDeviceStream(SDL_AUDIO_DEVICE_DEFAULT_PLAYBACK, &fmt, nullptr, nullptr);
+    SDL_ResumeAudioStreamDevice(stream);
+    return stream;
 }
 
-s32 SDLAudioOut::Output(s32 handle, const void* ptr) {
-    auto& port = ports_out.at(handle - 1);
-    if (!port.is_open) {
-        return ORBIS_AUDIO_OUT_ERROR_INVALID_PORT;
-    }
+void SDLAudioOut::Close(void* impl) {
+    SDL_DestroyAudioStream(static_cast<SDL_AudioStream*>(impl));
+}
 
-    const size_t data_size = port.samples_num * port.sample_size * port.channels_num;
-    bool result = SDL_PutAudioStreamData(port.stream, ptr, data_size);
-    while (SDL_GetAudioStreamAvailable(port.stream) > AUDIO_STREAM_BUFFER_THRESHOLD) {
+void SDLAudioOut::Output(void* impl, const void* ptr, size_t size) {
+    auto* stream = static_cast<SDL_AudioStream*>(impl);
+    SDL_PutAudioStreamData(stream, ptr, size);
+    while (SDL_GetAudioStreamAvailable(stream) > AUDIO_STREAM_BUFFER_THRESHOLD) {
         SDL_Delay(0);
     }
-    return result ? ORBIS_OK : -1;
 }
 
-s32 SDLAudioOut::SetVolume(s32 handle, s32 bitflag, s32* volume) {
-    using Libraries::AudioOut::OrbisAudioOutParamFormat;
-    auto& port = ports_out.at(handle - 1);
-    if (!port.is_open) {
-        return ORBIS_AUDIO_OUT_ERROR_INVALID_PORT;
-    }
-
-    for (int i = 0; i < port.channels_num; i++, bitflag >>= 1u) {
-        auto bit = bitflag & 0x1u;
-
-        if (bit == 1) {
-            int src_index = i;
-            if (port.format == OrbisAudioOutParamFormat::Float_8CH_Std ||
-                port.format == OrbisAudioOutParamFormat::S16_8CH_Std) {
-                switch (i) {
-                case 4:
-                    src_index = 6;
-                    break;
-                case 5:
-                    src_index = 7;
-                    break;
-                case 6:
-                    src_index = 4;
-                    break;
-                case 7:
-                    src_index = 5;
-                    break;
-                default:
-                    break;
-                }
-            }
-            port.volume[i] = volume[src_index];
-        }
-    }
-
-    return ORBIS_OK;
+void SDLAudioOut::SetVolume(void* impl, std::array<int, 8> ch_volumes) {
+    // Not yet implemented
 }
 
 } // namespace Libraries::AudioOut
diff --git a/src/core/libraries/audio/sdl_audio.h b/src/core/libraries/audio/sdl_audio.h
index 2c34f8e2..d55f2f6e 100644
--- a/src/core/libraries/audio/sdl_audio.h
+++ b/src/core/libraries/audio/sdl_audio.h
@@ -3,40 +3,16 @@
 
 #pragma once
 
-#include <shared_mutex>
-#include <SDL3/SDL_audio.h>
-#include "core/libraries/audio/audioout.h"
+#include "core/libraries/audio/audioout_backend.h"
 
 namespace Libraries::AudioOut {
 
-class SDLAudioOut {
+class SDLAudioOut final : public AudioOutBackend {
 public:
-    explicit SDLAudioOut() = default;
-    ~SDLAudioOut() = default;
-
-    s32 Open(OrbisAudioOutPort type, u32 samples_num, u32 freq, OrbisAudioOutParamFormat format);
-    s32 Output(s32 handle, const void* ptr);
-    s32 SetVolume(s32 handle, s32 bitflag, s32* volume);
-
-    constexpr std::pair<OrbisAudioOutPort, int> GetStatus(s32 handle) const {
-        const auto& port = ports_out.at(handle - 1);
-        return std::make_pair(port.type, port.channels_num);
-    }
-
-private:
-    struct PortOut {
-        SDL_AudioStream* stream;
-        u32 samples_num;
-        u32 freq;
-        OrbisAudioOutParamFormat format;
-        OrbisAudioOutPort type;
-        int channels_num;
-        std::array<int, 8> volume;
-        u8 sample_size;
-        bool is_open;
-    };
-    std::shared_mutex m_mutex;
-    std::array<PortOut, Libraries::AudioOut::SCE_AUDIO_OUT_NUM_PORTS> ports_out{};
+    void* Open(bool is_float, int num_channels, u32 sample_rate) override;
+    void Close(void* impl) override;
+    void Output(void* impl, const void* ptr, size_t size) override;
+    void SetVolume(void* impl, std::array<int, 8> ch_volumes) override;
 };
 
 } // namespace Libraries::AudioOut