1 files changed, 67 insertions, 0 deletions
diff --git a/media/libavextensions/common/AVExtensionsCommon.h b/media/libavextensions/common/AVExtensionsCommon.h
new file mode 100644
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+++ b/media/libavextensions/common/AVExtensionsCommon.h
@@ -0,0 +1,67 @@
+/*
+ * 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_