5 files changed, 170 insertions, 0 deletions

diff --git a/src/audio_core/renderer/upsampler/upsampler_info.cpp b/src/audio_core/renderer/upsampler/upsampler_info.cpp
new file mode 100644
index 000000000..e3d2f7db0
--- /dev/null
+++ b/src/audio_core/renderer/upsampler/upsampler_info.cpp
@@ -0,0 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "audio_core/renderer/upsampler/upsampler_info.h"
+
+namespace AudioCore::AudioRenderer {} // namespace AudioCore::AudioRenderer
diff --git a/src/audio_core/renderer/upsampler/upsampler_info.h b/src/audio_core/renderer/upsampler/upsampler_info.h
new file mode 100644
index 000000000..a43c15af3
--- /dev/null
+++ b/src/audio_core/renderer/upsampler/upsampler_info.h
@@ -0,0 +1,35 @@
+// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <array>
+
+#include "audio_core/common/common.h"
+#include "audio_core/renderer/upsampler/upsampler_state.h"
+#include "common/common_types.h"
+
+namespace AudioCore::AudioRenderer {
+class UpsamplerManager;
+
+/**
+ * Manages information needed to upsample a mix buffer.
+ */
+struct UpsamplerInfo {
+    /// States used by the AudioRenderer across calls.
+    std::array<UpsamplerState, MaxChannels> states{};
+    /// Pointer to the manager
+    UpsamplerManager* manager{};
+    /// Pointer to the samples to be upsampled
+    CpuAddr samples_pos{};
+    /// Target number of samples to upsample to
+    u32 sample_count{};
+    /// Number of channels to upsample
+    u32 input_count{};
+    /// Is this upsampler enabled?
+    bool enabled{};
+    /// Mix buffer indexes to be upsampled
+    std::array<s16, MaxChannels> inputs{};
+};
+
+} // namespace AudioCore::AudioRenderer
diff --git a/src/audio_core/renderer/upsampler/upsampler_manager.cpp b/src/audio_core/renderer/upsampler/upsampler_manager.cpp
new file mode 100644
index 000000000..4c76a5066
--- /dev/null
+++ b/src/audio_core/renderer/upsampler/upsampler_manager.cpp
@@ -0,0 +1,44 @@
+// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "audio_core/renderer/upsampler/upsampler_manager.h"
+
+namespace AudioCore::AudioRenderer {
+
+UpsamplerManager::UpsamplerManager(const u32 count_, std::span<UpsamplerInfo> infos_,
+                                   std::span<s32> workbuffer_)
+    : count{count_}, upsampler_infos{infos_}, workbuffer{workbuffer_} {}
+
+UpsamplerInfo* UpsamplerManager::Allocate() {
+    std::scoped_lock l{lock};
+
+    if (count == 0) {
+        return nullptr;
+    }
+
+    u32 free_index{0};
+    for (auto& upsampler : upsampler_infos) {
+        if (!upsampler.enabled) {
+            break;
+        }
+        free_index++;
+    }
+
+    if (free_index >= count) {
+        return nullptr;
+    }
+
+    auto& upsampler{upsampler_infos[free_index]};
+    upsampler.manager = this;
+    upsampler.sample_count = TargetSampleCount;
+    upsampler.samples_pos = CpuAddr(&workbuffer[upsampler.sample_count * MaxChannels]);
+    upsampler.enabled = true;
+    return &upsampler;
+}
+
+void UpsamplerManager::Free(UpsamplerInfo* info) {
+    std::scoped_lock l{lock};
+    info->enabled = false;
+}
+
+} // namespace AudioCore::AudioRenderer
diff --git a/src/audio_core/renderer/upsampler/upsampler_manager.h b/src/audio_core/renderer/upsampler/upsampler_manager.h
new file mode 100644
index 000000000..70cd42b08
--- /dev/null
+++ b/src/audio_core/renderer/upsampler/upsampler_manager.h
@@ -0,0 +1,45 @@
+// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <mutex>
+#include <span>
+
+#include "audio_core/renderer/upsampler/upsampler_info.h"
+#include "common/common_types.h"
+
+namespace AudioCore::AudioRenderer {
+/**
+ * Manages and has utility functions for upsampler infos.
+ */
+class UpsamplerManager {
+public:
+    UpsamplerManager(u32 count, std::span<UpsamplerInfo> infos, std::span<s32> workbuffer);
+
+    /**
+     * Allocate a new UpsamplerInfo.
+     *
+     * @return The allocated upsampler, may be nullptr if alloc failed.
+     */
+    UpsamplerInfo* Allocate();
+
+    /**
+     * Free the given upsampler.
+     *
+     * @param The upsampler to be freed.
+     */
+    void Free(UpsamplerInfo* info);
+
+private:
+    /// Maximum number of upsamplers in the buffer
+    const u32 count;
+    /// Upsamplers buffer
+    std::span<UpsamplerInfo> upsampler_infos;
+    /// Workbuffer for upsampling samples
+    std::span<s32> workbuffer;
+    /// Lock for allocate/free
+    std::mutex lock{};
+};
+
+} // namespace AudioCore::AudioRenderer
diff --git a/src/audio_core/renderer/upsampler/upsampler_state.h b/src/audio_core/renderer/upsampler/upsampler_state.h
new file mode 100644
index 000000000..28cebe200
--- /dev/null
+++ b/src/audio_core/renderer/upsampler/upsampler_state.h
@@ -0,0 +1,40 @@
+// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <array>
+
+#include "common/common_types.h"
+#include "common/fixed_point.h"
+
+namespace AudioCore::AudioRenderer {
+/**
+ * Upsampling state used by the AudioRenderer across calls.
+ */
+struct UpsamplerState {
+    static constexpr u16 HistorySize = 20;
+
+    /// Source data to target data ratio. E.g 48'000/32'000 = 1.5
+    Common::FixedPoint<16, 16> ratio;
+    /// Sample history
+    std::array<Common::FixedPoint<24, 8>, HistorySize> history;
+    /// Size of the sinc coefficient window
+    u16 window_size;
+    /// Read index for the history
+    u16 history_output_index;
+    /// Write index for the history
+    u16 history_input_index;
+    /// Start offset within the history, fixed to 0
+    u16 history_start_index;
+    /// Ebd offset within the history, fixed to HistorySize
+    u16 history_end_index;
+    /// Is this state initialized?
+    bool initialized;
+    /// Index of the current sample.
+    /// E.g 16K -> 48K has a ratio of 3, so this will be 0-2.
+    /// See the Upsample command in the AudioRenderer for more information.
+    u8 sample_index;
+};
+
+} // namespace AudioCore::AudioRenderer