Added a plugin loader class for drm+crypto HALs
bug:32815560
Change-Id: Iccd9451ff09e037db25eea672327912dd41c140f
diff --git a/include/media/PluginLoader.h b/include/media/PluginLoader.h
new file mode 100644
index 0000000..6017510
--- /dev/null
+++ b/include/media/PluginLoader.h
@@ -0,0 +1,96 @@
+/**
+ * Copyright (C) 2016 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.
+ */
+
+#ifndef PLUGIN_LOADER_H_
+#define PLUGIN_LOADER_H_
+
+#include "SharedLibrary.h"
+#include <utils/Log.h>
+#include <utils/String8.h>
+#include <utils/Vector.h>
+
+namespace android {
+
+template <class T>
+class PluginLoader {
+
+ public:
+ PluginLoader(const char *dir, const char *entry, const char *type) {
+ /**
+ * scan all plugins in the plugin directory and add them to the
+ * factories list.
+ */
+ String8 pluginDir(dir);
+
+ DIR* pDir = opendir(pluginDir.string());
+ if (pDir == NULL) {
+ ALOGE("Failed to find plugin directory %s", pluginDir.string());
+ } else {
+ struct dirent* pEntry;
+ while ((pEntry = readdir(pDir))) {
+ String8 file(pEntry->d_name);
+ if (file.getPathExtension() == ".so") {
+ String8 path = pluginDir + pEntry->d_name;
+ T *plugin = loadOne(path, entry, type);
+ if (plugin) {
+ factories.push(plugin);
+ }
+ }
+ }
+ closedir(pDir);
+ }
+ }
+
+ ~PluginLoader() {
+ for (size_t i = 0; i < factories.size(); i++) {
+ delete factories[i];
+ }
+ }
+
+ T *getFactory(size_t i) const {return factories[i];}
+ size_t factoryCount() const {return factories.size();}
+
+ private:
+ T* loadOne(const char *path, const char *entry, const char *type) {
+ sp<SharedLibrary> library = new SharedLibrary(String8(path));
+ if (!library.get()) {
+ ALOGE("Failed to open %s plugin library %s: %s", type, path,
+ library->lastError());
+ } else {
+ typedef T *(*CreateFactoryFunc)();
+ CreateFactoryFunc createFactoryFunc =
+ (CreateFactoryFunc)library->lookup(entry);
+ if (createFactoryFunc) {
+ libraries.push(library);
+ return createFactoryFunc();
+ } else {
+ ALOGE("Failed to create %s plugin factory from %s", type, path);
+ }
+ }
+ return NULL;
+ }
+
+ Vector<T *> factories;
+ Vector<sp<SharedLibrary> > libraries;
+
+ PluginLoader(const PluginLoader &) = delete;
+ void operator=(const PluginLoader &) = delete;
+};
+
+} // namespace android
+
+#endif // PLUGIN_LOADER_H_
+