cas: add CAS hal
Add CAS hal definitions and default service implementation.
bug: 22804304
Change-Id: I0a89608fe75c5f3c5e6888f9b771305742760707
diff --git a/cas/1.0/IMediaCasService.hal b/cas/1.0/IMediaCasService.hal
new file mode 100644
index 0000000..cfeafad
--- /dev/null
+++ b/cas/1.0/IMediaCasService.hal
@@ -0,0 +1,68 @@
+/*
+ * 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.
+ */
+package android.hardware.cas@1.0;
+
+import android.hardware.cas@1.0::ICas;
+import android.hardware.cas@1.0::ICasListener;
+import android.hardware.cas@1.0::IDescramblerBase;
+
+/**
+ * IMediaCasService is the main entry point for interacting with a vendor's
+ * cas HAL to create cas and descrambler plugin instances. A cas plugin instance
+ * opens cas sessions which are used to obtain keys for a descrambler session,
+ * which can in turn be used to descramble protected video content.
+ */
+interface IMediaCasService {
+ /**
+ * List all available CA systems on the device.
+ *
+ * @return descriptors an array of descriptors for the available CA systems.
+ */
+ enumeratePlugins() generates (vec<HidlCasPluginDescriptor> descriptors);
+
+ /**
+ * Query if a certain CA system is supported on this device.
+ *
+ * @param CA_system_id the id of the CA system.
+ * @return result whether the specified CA system is supported on this device.
+ */
+ isSystemIdSupported(int32_t CA_system_id) generates (bool result);
+
+ /**
+ * Construct a new instance of a CasPlugin given a CA_system_id.
+ *
+ * @param CA_system_id the id of the CA system.
+ * @param listener the event listener to receive events coming from the CasPlugin.
+ * @return cas the newly created CasPlugin interface.
+ */
+ createPlugin(int32_t CA_system_id, ICasListener listener) generates (ICas cas);
+
+ /**
+ * Query if the descrambling scheme for a CA system is supported on this device.
+ *
+ * @param CA_system_id the id of the CA system.
+ * @return result whether the specified descrambling scheme is supported on this device.
+ */
+ isDescramblerSupported(int32_t CA_system_id) generates (bool result);
+
+ /**
+ * Construct a new instance of a DescramblerPlugin given a CA_system_id.
+ *
+ * @param CA_system_id the id of the CA system.
+ * @return descrambler the newly created plugin interface.
+ */
+ createDescrambler(int32_t CA_system_id) generates (IDescramblerBase descrambler);
+};