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>

1 files changed, 155 insertions, 0 deletions

diff --git a/services/audiopolicy/engineconfigurable/src/Stream.cpp b/services/audiopolicy/engineconfigurable/src/Stream.cpp
new file mode 100755
index 0000000..bea2c19
--- /dev/null
+++ b/services/audiopolicy/engineconfigurable/src/Stream.cpp
@@ -0,0 +1,155 @@
+/*
+ * 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.
+ */
+
+#define LOG_TAG "APM::AudioPolicyEngine/Stream"
+
+#include "Stream.h"
+#include <system/audio.h>
+
+using std::string;
+
+namespace android
+{
+namespace audio_policy
+{
+
+status_t Element<audio_stream_type_t>::setIdentifier(audio_stream_type_t identifier)
+{
+    if (identifier > AUDIO_STREAM_CNT) {
+        return BAD_VALUE;
+    }
+    mIdentifier = identifier;
+    ALOGD("%s: Stream %s identifier 0x%X", __FUNCTION__, getName().c_str(), identifier);
+    return NO_ERROR;
+}
+
+/**
+* Set the strategy to follow for this stream.
+* It checks if the strategy is valid.
+*
+* @param[in] strategy to be followed.
+*
+* @return NO_ERROR if the strategy is set correctly, error code otherwise.
+*/
+template <>
+status_t Element<audio_stream_type_t>::set<routing_strategy>(routing_strategy strategy)
+{
+    if (strategy >= NUM_STRATEGIES) {
+        return BAD_VALUE;
+    }
+    mApplicableStrategy = strategy;
+    ALOGD("%s: 0x%X for Stream %s", __FUNCTION__, strategy, getName().c_str());
+    return NO_ERROR;
+}
+
+template <>
+routing_strategy Element<audio_stream_type_t>::get<routing_strategy>() const
+{
+    ALOGV("%s: 0x%X for Stream %s", __FUNCTION__, mApplicableStrategy, getName().c_str());
+    return mApplicableStrategy;
+}
+
+status_t Element<audio_stream_type_t>::setVolumeProfile(Volume::device_category category,
+                                                        const VolumeCurvePoints &points)
+{
+    ALOGD("%s: adding volume profile for %s for device category %d, points nb =%d", __FUNCTION__,
+          getName().c_str(), category, points.size());
+    mVolumeProfiles[category] = points;
+
+    for (size_t i = 0; i < points.size(); i++) {
+        ALOGV("%s: %s cat=%d curve index =%d Index=%d dBAttenuation=%f",
+              __FUNCTION__, getName().c_str(), category, i, points[i].mIndex,
+             points[i].mDBAttenuation);
+    }
+    return NO_ERROR;
+}
+
+status_t Element<audio_stream_type_t>::initVolume(int indexMin, int indexMax)
+{
+    ALOGV("initStreamVolume() stream %s, min %d, max %d", getName().c_str(), indexMin, indexMax);
+    if (indexMin < 0 || indexMin >= indexMax) {
+        ALOGW("initStreamVolume() invalid index limits for stream %s, min %d, max %d",
+              getName().c_str(), indexMin, indexMax);
+        return BAD_VALUE;
+    }
+    mIndexMin = indexMin;
+    mIndexMax = indexMax;
+
+    return NO_ERROR;
+}
+
+float Element<audio_stream_type_t>::volIndexToDb(Volume::device_category deviceCategory,
+                                                   int indexInUi)
+{
+    VolumeProfileConstIterator it = mVolumeProfiles.find(deviceCategory);
+    if (it == mVolumeProfiles.end()) {
+        ALOGE("%s: device category %d not found for stream %s", __FUNCTION__, deviceCategory,
+              getName().c_str());
+        return 1.0f;
+    }
+    const VolumeCurvePoints curve = mVolumeProfiles[deviceCategory];
+    if (curve.size() != Volume::VOLCNT) {
+        ALOGE("%s: invalid profile for category %d and for stream %s", __FUNCTION__, deviceCategory,
+              getName().c_str());
+        return 1.0f;
+    }
+
+    // the volume index in the UI is relative to the min and max volume indices for this stream type
+    int nbSteps = 1 + curve[Volume::VOLMAX].mIndex -
+            curve[Volume::VOLMIN].mIndex;
+
+    if (mIndexMax - mIndexMin == 0) {
+        ALOGE("%s: Invalid volume indexes Min=Max=%d", __FUNCTION__, mIndexMin);
+        return 1.0f;
+    }
+    int volIdx = (nbSteps * (indexInUi - mIndexMin)) /
+            (mIndexMax - mIndexMin);
+
+    // find what part of the curve this index volume belongs to, or if it's out of bounds
+    int segment = 0;
+    if (volIdx < curve[Volume::VOLMIN].mIndex) {         // out of bounds
+        return 0.0f;
+    } else if (volIdx < curve[Volume::VOLKNEE1].mIndex) {
+        segment = 0;
+    } else if (volIdx < curve[Volume::VOLKNEE2].mIndex) {
+        segment = 1;
+    } else if (volIdx <= curve[Volume::VOLMAX].mIndex) {
+        segment = 2;
+    } else {                                                               // out of bounds
+        return 1.0f;
+    }
+
+    // linear interpolation in the attenuation table in dB
+    float decibels = curve[segment].mDBAttenuation +
+            ((float)(volIdx - curve[segment].mIndex)) *
+                ( (curve[segment+1].mDBAttenuation -
+                        curve[segment].mDBAttenuation) /
+                    ((float)(curve[segment+1].mIndex -
+                            curve[segment].mIndex)) );
+
+    ALOGV("VOLUME vol index=[%d %d %d], dB=[%.1f %.1f %.1f]",
+            curve[segment].mIndex, volIdx,
+            curve[segment+1].mIndex,
+            curve[segment].mDBAttenuation,
+            decibels,
+            curve[segment+1].mDBAttenuation);
+
+    return decibels;
+}
+
+} // namespace audio_policy
+} // namespace android
+