Add Flag for Enabling 64-bit Legacy DRM Plugins

We are ready for devices to begin migrating to a 64-bit Legacy DRM
Loader. However, not all devices are ready to make this jump yet. A
device needs to have all of its Legacy DRM Plugins ready to run as
64-bit before it can do this. This includes having 64-bit hardware
integrations.

So that devices can turn on 64-bit support as they get ready, I am
adding flags that can be set in a device's device.mk file. There are two
parts:

* ENABLE_MEDIADRM_64 enables building the Legacy DRM Plugin HAL as
  64-bit.

* Setting drm.64bit.enabled=true in PRODUCT_PROPERTY_OVERRIDES switches
  the Legacy DRM Plugin HAL to searching for DRM Plugins in the 64-bit
  directory.

Test: Validated that turning on these flags enables a 64-bit Legacy DRM
      Plugin HAL that loads 64-bit Legacy DRM Plugins from the lib64
      directory.
Bug: 36076017
Change-Id: I8d21fc7e7c0357eb6755839d41caa0f37ca20aff

drm/1.0/default/Android.mk

@@ -38,9 +38,12 @@ LOCAL_SHARED_LIBRARIES := \
 LOCAL_C_INCLUDES := \
   hardware/interfaces/drm
 
-# TODO: The legacy DRM plugins only support 32-bit. They need
-# to be migrated to 64-bit (b/18948909)
+# TODO(b/18948909) Some legacy DRM plugins only support 32-bit. They need to be
+# migrated to 64-bit. Once all of a device's legacy DRM plugins support 64-bit,
+# that device can turn on ENABLE_MEDIADRM_64 to build this service as 64-bit.
+ifneq ($(ENABLE_MEDIADRM_64), true)
 LOCAL_32_BIT_ONLY := true
+endif
 
 include $(BUILD_EXECUTABLE)
 
@@ -55,11 +58,13 @@ LOCAL_SRC_FILES := \
     DrmPlugin.cpp \
     CryptoFactory.cpp \
     CryptoPlugin.cpp \
+    LegacyPluginPath.cpp \
     TypeConvert.cpp \
 
 LOCAL_SHARED_LIBRARIES := \
     android.hardware.drm@1.0 \
     android.hidl.memory@1.0 \
+    libcutils \
     libhidlbase \
     libhidlmemory \
     libhidltransport \
@@ -72,8 +77,11 @@ LOCAL_C_INCLUDES := \
     frameworks/native/include \
     frameworks/av/include
 
-# TODO: The legacy DRM plugins only support 32-bit. They need
-# to be migrated to 64-bit (b/18948909)
+# TODO: Some legacy DRM plugins only support 32-bit. They need to be migrated to
+# 64-bit. (b/18948909) Once all of a device's legacy DRM plugins support 64-bit,
+# that device can turn on ENABLE_MEDIADRM_64 to build this impl as 64-bit.
+ifneq ($(ENABLE_MEDIADRM_64), true)
 LOCAL_32_BIT_ONLY := true
+endif
 
 include $(BUILD_SHARED_LIBRARY)

drm/1.0/default/CryptoFactory.cpp

@@ -17,6 +17,7 @@
 
 #include "CryptoFactory.h"
 #include "CryptoPlugin.h"
+#include "LegacyPluginPath.h"
 #include "TypeConvert.h"
 #include <utils/Log.h>
 
@@ -27,7 +28,7 @@ namespace V1_0 {
 namespace implementation {
 
     CryptoFactory::CryptoFactory() :
-        loader("/vendor/lib/mediadrm", "createCryptoFactory") {
+        loader(getDrmPluginPath(), "createCryptoFactory") {
     }
 
     // Methods from ::android::hardware::drm::V1_0::ICryptoFactory follow.

drm/1.0/default/DrmFactory.cpp

@@ -1,6 +1,6 @@
 /*
  * 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
@@ -17,6 +17,7 @@
 
 #include "DrmFactory.h"
 #include "DrmPlugin.h"
+#include "LegacyPluginPath.h"
 #include "TypeConvert.h"
 #include <utils/Log.h>
 
@@ -27,7 +28,7 @@ namespace V1_0 {
 namespace implementation {
 
     DrmFactory::DrmFactory() :
-        loader("/vendor/lib/mediadrm", "createDrmFactory") {
+        loader(getDrmPluginPath(), "createDrmFactory") {
     }
 
     // Methods from ::android::hardware::drm::V1_0::IDrmFactory follow.

drm/1.0/default/LegacyPluginPath.cpp

@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2017 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.
+ */
+
+#include "LegacyPluginPath.h"
+
+#include <cutils/properties.h>
+
+namespace android {
+namespace hardware {
+namespace drm {
+namespace V1_0 {
+namespace implementation {
+
+const char* getDrmPluginPath() {
+    if (property_get_bool("drm.64bit.enabled", false)) {
+        return "/vendor/lib64/mediadrm";
+    } else {
+        return "/vendor/lib/mediadrm";
+    }
+}
+
+}  // namespace implementation
+}  // namespace V1_0
+}  // namespace drm
+}  // namespace hardware
+}  // namespace android

drm/1.0/default/LegacyPluginPath.h

@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2017 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 LEGACY_PLUGIN_PATH_H_
+
+#define LEGACY_PLUGIN_PATH_H_
+
+namespace android {
+namespace hardware {
+namespace drm {
+namespace V1_0 {
+namespace implementation {
+
+const char* getDrmPluginPath();
+
+}  // namespace implementation
+}  // namespace V1_0
+}  // namespace drm
+}  // namespace hardware
+}  // namespace android
+
+#endif  // LEGACY_PLUGIN_PATH_H_