Add a configurable version of the policy engine based on PFW

This patch adds a configurable version of the policy engine
based on the parameter framework.
This configurable engine shall be activated with a flag
USE_CONFIGURABLE_AUDIO_POLICY within BoardConfig.mk

This patch provides the generic configuration as an example.
This configuration provides the same user experience as the default
policy engine.

- Fix M Issue on configurable policy engine version.

- Remove the "empty static lib include trick" hack

The code was using a hack to import headers only through an empty lib.
This trick was used not only by the PFW and its plugin but also internally
with policy.

This patch removes this hack and either links againts the real libraries if exist
or point on the path of the header.
However, since header directories are not recursively detected on Andoid, we need to manually
add all necessary libraries. (for example libicuuc needed by libxml2)

- let the build system decide which compiler and which stl is to be used

- Disable by default Audio Policy Settings XML file generation at compilation time

In order not to depend on python tool for the configurable policy example,
this patch adds the generated Settings XML file and disables the generation
from .pfw files at compile time.
If the user wishes to regenerate it, he may use the pfw_rebuild_settings
option.

- Fix Clang issues within Configurable Audio Policy

Fix compilation issues revealed when switching to CLANG compiler
within the configurable version of policy engine.

Change-Id: I3edc26db94c0bf8a76430ab8081bae52e9193705
Signed-off-by: François Gaffie <francois.gaffie@intel.com>

2 files changed, 103 insertions, 0 deletions

diff --git a/services/audiopolicy/engineconfigurable/include/AudioPolicyEngineInstance.h b/services/audiopolicy/engineconfigurable/include/AudioPolicyEngineInstance.h
new file mode 100755
index 0000000..6c4be2c
--- /dev/null
+++ b/services/audiopolicy/engineconfigurable/include/AudioPolicyEngineInstance.h
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2015 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.
+ */
+
+#pragma once
+
+class AudioPolicyManagerInterface;
+class AudioPolicyPluginInterface;
+
+namespace android
+{
+namespace audio_policy
+{
+
+class Engine;
+
+class EngineInstance
+{
+protected:
+    EngineInstance();
+
+public:
+    virtual ~EngineInstance();
+
+    /**
+     * Get Audio Policy Engine instance.
+     *
+     * @return pointer to Route Manager Instance object.
+     */
+    static EngineInstance *getInstance();
+
+    /**
+     * Interface query.
+     * The first client of an interface of the policy engine will start the singleton.
+     *
+     * @tparam RequestedInterface: interface that the client is wishing to retrieve.
+     *
+     * @return interface handle.
+     */
+    template <class RequestedInterface>
+    RequestedInterface *queryInterface() const;
+
+protected:
+    /**
+     * Get Audio Policy Engine instance.
+     *
+     * @return Audio Policy Engine singleton.
+     */
+    Engine *getEngine() const;
+
+private:
+    /* Copy facilities are put private to disable copy. */
+    EngineInstance(const EngineInstance &object);
+    EngineInstance &operator=(const EngineInstance &object);
+};
+
+/**
+ * Limit template instantation to supported type interfaces.
+ * Compile time error will claim if invalid interface is requested.
+ */
+template <>
+AudioPolicyManagerInterface *EngineInstance::queryInterface() const;
+
+template <>
+AudioPolicyPluginInterface *EngineInstance::queryInterface() const;
+
+}; // namespace audio_policy
+
+}; // namespace android
diff --git a/services/audiopolicy/engineconfigurable/include/EngineDefinition.h b/services/audiopolicy/engineconfigurable/include/EngineDefinition.h
new file mode 100755
index 0000000..54d8db5
--- /dev/null
+++ b/services/audiopolicy/engineconfigurable/include/EngineDefinition.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2015 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.
+ */
+
+#pragma once
+
+#include <Volume.h>
+#include <vector>
+
+typedef std::vector<VolumeCurvePoint> VolumeCurvePoints;