Remove dependency to libmediadrm from drm HAL
drm HAL has been using libmediadrm for android::SharedLibrary class and
android::PluginLoader class. This is a Treble violation since
libmediadrm is a framework-only library that is not available to
vendors.
To solve the problem, the two classes are copied into this directory
to form a small static library android.hardware.drm@1.0-helper.a.
Bug: 38302533
Test: mm under /hardware/interfaces/drm/1.0/default and
/hardware/interfaces/drm/1.0/vts/functional
Change-Id: I7b4e5cdb3bc815e971e0c3b7ec99ea86042e13eb
diff --git a/drm/1.0/default/include/PluginLoader.h b/drm/1.0/default/include/PluginLoader.h
new file mode 100644
index 0000000..f387b3c
--- /dev/null
+++ b/drm/1.0/default/include/PluginLoader.h
@@ -0,0 +1,107 @@
+/**
+ * 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 {
+namespace hardware {
+namespace drm {
+namespace V1_0 {
+namespace helper {
+
+template <class T>
+class PluginLoader {
+
+ public:
+ PluginLoader(const char *dir, const char *entry) {
+ /**
+ * 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);
+ 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) {
+ sp<SharedLibrary> library = new SharedLibrary(String8(path));
+ if (!library.get()) {
+ ALOGE("Failed to open plugin library %s: %s", path,
+ library->lastError());
+ } else {
+ typedef T *(*CreateFactoryFunc)();
+ CreateFactoryFunc createFactoryFunc =
+ (CreateFactoryFunc)library->lookup(entry);
+ if (createFactoryFunc) {
+ ALOGV("Found plugin factory entry %s in %s", entry, path);
+ libraries.push(library);
+ T* result = createFactoryFunc();
+ return result;
+ }
+ }
+ return NULL;
+ }
+
+ Vector<T *> factories;
+ Vector<sp<SharedLibrary> > libraries;
+
+ PluginLoader(const PluginLoader &) = delete;
+ void operator=(const PluginLoader &) = delete;
+};
+
+}
+}
+}
+}
+} // namespace android
+
+#endif // PLUGIN_LOADER_H_
+