services/audiopolicy/managerdefault/EngineLibrary.h

/*
 * Copyright 2019 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 <functional>
#include <memory>
#include <string>

#include <EngineInterface.h>
#include <android/media/audio/common/AudioHalEngineConfig.h>

namespace android {

using EngineInstance = std::unique_ptr<EngineInterface, std::function<void (EngineInterface*)>>;

EngineInstance loadApmEngineLibraryAndCreateEngine(const std::string& librarySuffix,
        const std::string& configXmlFilePath = "");
EngineInstance loadApmEngineLibraryAndCreateEngine(const std::string& librarySuffix,
        const media::audio::common::AudioHalEngineConfig& config);

class EngineLibrary : public std::enable_shared_from_this<EngineLibrary> {
public:
    static std::shared_ptr<EngineLibrary> load(const std::string& librarySuffix);
    ~EngineLibrary();

    EngineLibrary(const EngineLibrary&) = delete;
    EngineLibrary(EngineLibrary&&) = delete;
    EngineLibrary& operator=(const EngineLibrary&) = delete;
    EngineLibrary& operator=(EngineLibrary&&) = delete;

    EngineInstance createEngineUsingXmlConfig(const std::string& xmlFilePath);
    EngineInstance createEngineUsingHalConfig(
            const media::audio::common::AudioHalEngineConfig& config);

private:
    EngineLibrary() = default;
    bool init(std::string libraryPath);
    EngineInstance createEngine();
    void close();

    void *mLibraryHandle = nullptr;
    EngineInterface* (*mCreateEngineInstance)() = nullptr;
    void (*mDestroyEngineInstance)(EngineInterface*) = nullptr;
};

}  // namespace android