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/*
* Copyright (c) 2013 - 2015, The Linux Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* * Neither the name of The Linux Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _AV_EXTENSIONS_COMMON_H_
#define _AV_EXTENSIONS_COMMON_H_
namespace android {
typedef void *(*createFunction_t)(void);
template <typename T>
struct ExtensionsLoader {
static T *createInstance(const char *createFunctionName);
private:
static void loadLib();
static createFunction_t loadCreateFunction(const char *createFunctionName);
static void *mLibHandle;
};
/*
* Boiler-plate to declare the class as a singleton (with a static getter)
* which can be loaded (dlopen'd) via ExtensionsLoader
*/
#define DECLARE_LOADABLE_SINGLETON(className) \
protected: \
className(); \
virtual ~className(); \
static className *sInst; \
private: \
className(const className&); \
className &operator=(className &); \
public: \
static className *get() { \
return sInst; \
} \
friend struct ExtensionsLoader<className>;
} //namespace android
#endif // _AV_EXTENSIONS_COMMON_H_
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