1 files changed, 138 insertions, 0 deletions

diff --git a/src/audio_core/common/common.h b/src/audio_core/common/common.h
new file mode 100644
index 000000000..6abd9be45
--- /dev/null
+++ b/src/audio_core/common/common.h
@@ -0,0 +1,138 @@
+// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <numeric>
+#include <span>
+
+#include "common/assert.h"
+#include "common/common_funcs.h"
+#include "common/common_types.h"
+
+namespace AudioCore {
+using CpuAddr = std::uintptr_t;
+
+enum class PlayState : u8 {
+    Started,
+    Stopped,
+    Paused,
+};
+
+enum class SrcQuality : u8 {
+    Medium,
+    High,
+    Low,
+};
+
+enum class SampleFormat : u8 {
+    Invalid,
+    PcmInt8,
+    PcmInt16,
+    PcmInt24,
+    PcmInt32,
+    PcmFloat,
+    Adpcm,
+};
+
+enum class SessionTypes {
+    AudioIn,
+    AudioOut,
+    FinalOutputRecorder,
+};
+
+enum class Channels : u32 {
+    FrontLeft,
+    FrontRight,
+    Center,
+    LFE,
+    BackLeft,
+    BackRight,
+};
+
+// These are used by Delay, Reverb and I3dl2Reverb prior to Revision 11.
+enum class OldChannels : u32 {
+    FrontLeft,
+    FrontRight,
+    BackLeft,
+    BackRight,
+    Center,
+    LFE,
+};
+
+constexpr u32 BufferCount = 32;
+
+constexpr u32 MaxRendererSessions = 2;
+constexpr u32 TargetSampleCount = 240;
+constexpr u32 TargetSampleRate = 48'000;
+constexpr u32 MaxChannels = 6;
+constexpr u32 MaxMixBuffers = 24;
+constexpr u32 MaxWaveBuffers = 4;
+constexpr s32 LowestVoicePriority = 0xFF;
+constexpr s32 HighestVoicePriority = 0;
+constexpr u32 BufferAlignment = 0x40;
+constexpr u32 WorkbufferAlignment = 0x1000;
+constexpr s32 FinalMixId = 0;
+constexpr s32 InvalidDistanceFromFinalMix = std::numeric_limits<s32>::min();
+constexpr s32 UnusedSplitterId = -1;
+constexpr s32 UnusedMixId = std::numeric_limits<s32>::max();
+constexpr u32 InvalidNodeId = 0xF0000000;
+constexpr s32 InvalidProcessOrder = -1;
+constexpr u32 MaxBiquadFilters = 2;
+constexpr u32 MaxEffects = 256;
+
+constexpr bool IsChannelCountValid(u16 channel_count) {
+    return channel_count <= 6 &&
+           (channel_count == 1 || channel_count == 2 || channel_count == 4 || channel_count == 6);
+}
+
+constexpr void UseOldChannelMapping(std::span<s16> inputs, std::span<s16> outputs) {
+    constexpr auto old_center{static_cast<u32>(OldChannels::Center)};
+    constexpr auto new_center{static_cast<u32>(Channels::Center)};
+    constexpr auto old_lfe{static_cast<u32>(OldChannels::LFE)};
+    constexpr auto new_lfe{static_cast<u32>(Channels::LFE)};
+
+    auto center{inputs[old_center]};
+    auto lfe{inputs[old_lfe]};
+    inputs[old_center] = inputs[new_center];
+    inputs[old_lfe] = inputs[new_lfe];
+    inputs[new_center] = center;
+    inputs[new_lfe] = lfe;
+
+    center = outputs[old_center];
+    lfe = outputs[old_lfe];
+    outputs[old_center] = outputs[new_center];
+    outputs[old_lfe] = outputs[new_lfe];
+    outputs[new_center] = center;
+    outputs[new_lfe] = lfe;
+}
+
+constexpr u32 GetSplitterInParamHeaderMagic() {
+    return Common::MakeMagic('S', 'N', 'D', 'H');
+}
+
+constexpr u32 GetSplitterInfoMagic() {
+    return Common::MakeMagic('S', 'N', 'D', 'I');
+}
+
+constexpr u32 GetSplitterSendDataMagic() {
+    return Common::MakeMagic('S', 'N', 'D', 'D');
+}
+
+constexpr size_t GetSampleFormatByteSize(SampleFormat format) {
+    switch (format) {
+    case SampleFormat::PcmInt8:
+        return 1;
+    case SampleFormat::PcmInt16:
+        return 2;
+    case SampleFormat::PcmInt24:
+        return 3;
+    case SampleFormat::PcmInt32:
+    case SampleFormat::PcmFloat:
+        return 4;
+    default:
+        return 2;
+    }
+}
+
+} // namespace AudioCore