audio: import aidl hal

* hardware/interfaces/audio/aidl/default/ at android-16.0.0_r1.

audio/include/effect-impl/EffectThread.h

@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+#include <atomic>
+#include <memory>
+#include <string>
+#include <thread>
+
+#include <android-base/thread_annotations.h>
+#include <fmq/EventFlag.h>
+#include <system/thread_defs.h>
+
+#include "effect-impl/EffectContext.h"
+#include "effect-impl/EffectTypes.h"
+
+namespace aidl::android::hardware::audio::effect {
+
+class EffectThread {
+  public:
+    virtual ~EffectThread();
+
+    // called by effect implementation
+    RetCode createThread(const std::string& name, int priority = ANDROID_PRIORITY_URGENT_AUDIO);
+    RetCode destroyThread();
+    RetCode startThread();
+    RetCode stopThread();
+    RetCode startDraining();
+    RetCode finishDraining();
+
+    // Will call process() in a loop if the thread is running.
+    void threadLoop();
+
+    /**
+     * process() call effectProcessImpl() for effect data processing, it is necessary for the
+     * processing to be called under Effect thread mutex mThreadMutex, to avoid the effect state
+     * change before/during data processing, and keep the thread and effect state consistent.
+     */
+    virtual void process() = 0;
+
+  protected:
+    bool mDraining GUARDED_BY(mThreadMutex) = false;
+
+  private:
+    static constexpr int kMaxTaskNameLen = 15;
+
+    std::mutex mThreadMutex;
+    std::condition_variable mCv;
+    bool mStop GUARDED_BY(mThreadMutex) = true;
+    bool mExit GUARDED_BY(mThreadMutex) = false;
+
+    std::thread mThread;
+    int mPriority;
+    std::string mName;
+};
+}  // namespace aidl::android::hardware::audio::effect