audio_core: Implement OpenAL backend (#6450)

src/audio_core/static_input.h

@@ -0,0 +1,33 @@
+// Copyright 2019 Citra 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/input.h"
+#include "common/swap.h"
+#include "common/threadsafe_queue.h"
+
+namespace AudioCore {
+
+class StaticInput final : public Input {
+public:
+    StaticInput();
+    ~StaticInput() override;
+
+    void StartSampling(const InputParameters& params) override;
+    void StopSampling() override;
+    void AdjustSampleRate(u32 sample_rate) override;
+
+    Samples Read() override;
+
+private:
+    u16 sample_rate = 0;
+    u8 sample_size = 0;
+    std::vector<u8> CACHE_8_BIT;
+    std::vector<u8> CACHE_16_BIT;
+};
+
+} // namespace AudioCore