91 lines
3.6 KiB
C++
91 lines
3.6 KiB
C++
/*
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* Copyright (c) 2013 - 2016, The Linux Foundation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* * Neither the name of The Linux Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <dlfcn.h>
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#include <common/AVExtensionsCommon.h>
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namespace android {
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/*
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* Create strongly-typed objects of type T
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* If the customization library exists and does contain a "named" constructor,
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* invoke and create an instance
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* Else create the object of type T itself
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*
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* Contains a static instance to dlopen'd library, But may end up
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* opening the library mutiple times. Following snip from dlopen man page is
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* reassuring "...Only a single copy of an object file is brought into the
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* address space, even if dlopen() is invoked multiple times in reference to
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* the file, and even if different pathnames are used to reference the file.."
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*/
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template <typename T>
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T *ExtensionsLoader<T>::createInstance(const char *createFunctionName) {
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ALOGV("createInstance(%lubit) : %s", (unsigned long)sizeof(intptr_t)*8, createFunctionName);
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// create extended object if extensions-lib is available and
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// AV_ENHANCEMENTS is enabled
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#if ENABLE_AV_ENHANCEMENTS
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createFunction_t createFunc = loadCreateFunction(createFunctionName);
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if (createFunc) {
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return reinterpret_cast<T *>((*createFunc)());
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}
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#endif
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// Else, create the default object
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return new T;
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}
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template <typename T>
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void ExtensionsLoader<T>::loadLib() {
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if (!mLibHandle) {
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mLibHandle = ::dlopen(CUSTOMIZATION_LIB_NAME, RTLD_LAZY);
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if (!mLibHandle) {
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ALOGV("%s", dlerror());
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return;
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}
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ALOGV("Opened %s", CUSTOMIZATION_LIB_NAME);
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}
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}
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template <typename T>
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createFunction_t ExtensionsLoader<T>::loadCreateFunction(const char *createFunctionName) {
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loadLib();
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if (!mLibHandle) {
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return NULL;
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}
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createFunction_t func = (createFunction_t)dlsym(mLibHandle, createFunctionName);
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if (!func) {
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ALOGW("symbol %s not found: %s",createFunctionName, dlerror());
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}
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return func;
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}
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//static
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template <typename T>
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void *ExtensionsLoader<T>::mLibHandle = NULL;
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} //namespace android
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