Initial import of Widevine Common Encryption DRM engine

Builds libwvmdrmengine.so, which is loaded by the new
MediaDrm APIs to support playback of Widevine/CENC
protected content.

Change-Id: I6f57dd37083dfd96c402cb9dd137c7d74edc8f1c

libwvdrmengine/src/WVCryptoFactory.cpp

@@ -0,0 +1,89 @@
+//
+// Copyright 2013 Google Inc. All Rights Reserved.
+//
+
+//#define LOG_NDEBUG 0
+#define LOG_TAG "WVCdm"
+#include <utils/Log.h>
+
+#include "WVCryptoFactory.h"
+
+#include <dlfcn.h>
+
+#include "utils/Errors.h"
+#include "WVCDMSingleton.h"
+#include "WVCryptoPlugin.h"
+#include "WVUUID.h"
+
+namespace wvdrm {
+
+using namespace android;
+
+WVCryptoFactory::WVCryptoFactory()
+    : mLegacyLibraryHandle(NULL),
+      mLegacyFactory(NULL) {
+  mLegacyLibraryHandle = dlopen("libdrmdecrypt.so", RTLD_NOW);
+
+  if (mLegacyLibraryHandle == NULL) {
+    ALOGE("Unable to locate libdrmdecrypt.so");
+  } else {
+    typedef CryptoFactory* (*CreateCryptoFactoryFunc)();
+
+    CreateCryptoFactoryFunc legacyCreateCryptoFactory =
+        (CreateCryptoFactoryFunc)dlsym(mLegacyLibraryHandle,
+                                       "createCryptoFactory");
+
+    if (legacyCreateCryptoFactory == NULL) {
+      ALOGE("Unable to find legacy symbol 'createCryptoFactory'.");
+      dlclose(mLegacyLibraryHandle);
+      mLegacyLibraryHandle = NULL;
+    } else {
+      mLegacyFactory = legacyCreateCryptoFactory();
+      if (mLegacyFactory == NULL) {
+        ALOGE("Legacy createCryptoFactory() failed.");
+        dlclose(mLegacyLibraryHandle);
+        mLegacyLibraryHandle = NULL;
+      }
+    }
+  }
+}
+
+WVCryptoFactory::~WVCryptoFactory() {
+  if (mLegacyFactory != NULL) {
+    delete mLegacyFactory;
+    mLegacyFactory = NULL;
+  }
+
+  if (mLegacyLibraryHandle != NULL) {
+    dlclose(mLegacyLibraryHandle);
+    mLegacyLibraryHandle = NULL;
+  }
+}
+
+bool WVCryptoFactory::isCryptoSchemeSupported(const uint8_t uuid[16]) const {
+  return isWidevineUUID(uuid);
+}
+
+status_t WVCryptoFactory::createPlugin(const uint8_t uuid[16], const void* data,
+                                       size_t size, CryptoPlugin** plugin) {
+  if (!isCryptoSchemeSupported(uuid)) {
+    *plugin = NULL;
+    return BAD_VALUE;
+  }
+
+  // 0 size means they want an old-style Widevine plugin
+  if (size == 0) {
+    if (mLegacyFactory == NULL) {
+      return -EINVAL;
+    }
+
+    return mLegacyFactory->createPlugin(uuid, data, size, plugin);
+  }
+
+  // We received a session ID, so create a CENC plugin.
+  *plugin = new WVCryptoPlugin(data, size, getCDM());
+
+  return OK;
+}
+
+} // namespace wvdrm