Project Andio

src/audio_core/audio_manager.h

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+// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <array>
+#include <atomic>
+#include <functional>
+#include <mutex>
+#include <thread>
+
+#include "audio_core/audio_event.h"
+#include "core/hle/service/audio/errors.h"
+
+namespace Core {
+class System;
+}
+
+namespace AudioCore {
+
+namespace AudioOut {
+class Manager;
+}
+
+namespace AudioIn {
+class Manager;
+}
+
+/**
+ * The AudioManager's main purpose is to wait for buffer events for the audio in and out managers,
+ * and call an associated callback to release buffers.
+ *
+ * Execution pattern is:
+ *     Buffers appended ->
+ *     Buffers queued and played by the backend stream ->
+ *     When consumed, set the corresponding manager event and signal the audio manager ->
+ *     Consumed buffers are released, game is signalled ->
+ *     Game appends more buffers.
+ *
+ * This is only used by audio in and audio out.
+ */
+class AudioManager {
+    using BufferEventFunc = std::function<void()>;
+
+public:
+    explicit AudioManager(Core::System& system);
+
+    /**
+     * Shutdown the audio manager.
+     */
+    void Shutdown();
+
+    /**
+     * Register the out manager, keeping a function to be called when the out event is signalled.
+     *
+     * @param buffer_func - Function to be called on signal.
+     * @return Result code.
+     */
+    Result SetOutManager(BufferEventFunc buffer_func);
+
+    /**
+     * Register the in manager, keeping a function to be called when the in event is signalled.
+     *
+     * @param buffer_func - Function to be called on signal.
+     * @return Result code.
+     */
+    Result SetInManager(BufferEventFunc buffer_func);
+
+    /**
+     * Set an event to signalled, and signal the thread.
+     *
+     * @param type      - Manager type to set.
+     * @param signalled - Set the event to true or false?
+     */
+    void SetEvent(Event::Type type, bool signalled);
+
+private:
+    /**
+     * Main thread, waiting on a manager signal and calling the registered fucntion.
+     */
+    void ThreadFunc();
+
+    /// Core system
+    Core::System& system;
+    /// Have sessions started palying?
+    bool sessions_started{};
+    /// Is the main thread running?
+    std::atomic<bool> running{};
+    /// Unused
+    bool needs_update{};
+    /// Events to be set and signalled
+    Event events{};
+    /// Callbacks for each manager
+    std::array<BufferEventFunc, 3> buffer_events{};
+    /// General lock
+    std::mutex lock{};
+    /// Main thread for waiting and callbacks
+    std::jthread thread;
+};
+
+} // namespace AudioCore