audiopolicy: moves Stream Volume Curves to Engine

This CL moves the volume curves to the engine.
The configuration files of volume are now owned by the engine,
that is intended to become vendor specific.

Test: build, dumpsys media.audio_policy and checks the volume curves.
Bug: 124767636

Change-Id: I9e3b256d2eb89c8eac6b282db0e59ec3af47d76d
Signed-off-by: François Gaffie <francois.gaffie@renault.com>
diff --git a/services/audiopolicy/common/managerdefinitions/Android.bp b/services/audiopolicy/common/managerdefinitions/Android.bp
index e5ebab7..c9037a1 100644
--- a/services/audiopolicy/common/managerdefinitions/Android.bp
+++ b/services/audiopolicy/common/managerdefinitions/Android.bp
@@ -19,7 +19,6 @@
         "src/Serializer.cpp",
         "src/SoundTriggerSession.cpp",
         "src/TypeConverter.cpp",
-        "src/VolumeCurve.cpp",
     ],
     shared_libs: [
         "libcutils",
diff --git a/services/audiopolicy/common/managerdefinitions/include/AudioPolicyConfig.h b/services/audiopolicy/common/managerdefinitions/include/AudioPolicyConfig.h
index d52eb3d..2264d8f 100644
--- a/services/audiopolicy/common/managerdefinitions/include/AudioPolicyConfig.h
+++ b/services/audiopolicy/common/managerdefinitions/include/AudioPolicyConfig.h
@@ -20,7 +20,6 @@
 #include <unordered_set>
 
 #include <AudioGain.h>
-#include <VolumeCurve.h>
 #include <AudioPort.h>
 #include <AudioPatch.h>
 #include <DeviceDescriptor.h>
@@ -40,13 +39,11 @@
     AudioPolicyConfig(HwModuleCollection &hwModules,
                       DeviceVector &availableOutputDevices,
                       DeviceVector &availableInputDevices,
-                      sp<DeviceDescriptor> &defaultOutputDevice,
-                      VolumeCurvesCollection *volumes = nullptr)
+                      sp<DeviceDescriptor> &defaultOutputDevice)
         : mHwModules(hwModules),
           mAvailableOutputDevices(availableOutputDevices),
           mAvailableInputDevices(availableInputDevices),
           mDefaultOutputDevice(defaultOutputDevice),
-          mVolumeCurves(volumes),
           mIsSpeakerDrcEnabled(false)
     {}
 
@@ -58,13 +55,6 @@
         mSource = file;
     }
 
-    void setVolumes(const VolumeCurvesCollection &volumes)
-    {
-        if (mVolumeCurves != nullptr) {
-            *mVolumeCurves = volumes;
-        }
-    }
-
     void setHwModules(const HwModuleCollection &hwModules)
     {
         mHwModules = hwModules;
@@ -182,7 +172,6 @@
     DeviceVector &mAvailableOutputDevices;
     DeviceVector &mAvailableInputDevices;
     sp<DeviceDescriptor> &mDefaultOutputDevice;
-    VolumeCurvesCollection *mVolumeCurves;
     // TODO: remove when legacy conf file is removed. true on devices that use DRC on the
     // DEVICE_CATEGORY_SPEAKER path to boost soft sounds, used to adjust volume curves accordingly.
     // Note: remove also speaker_drc_enabled from global configuration of XML config file.
diff --git a/services/audiopolicy/common/managerdefinitions/include/IVolumeCurves.h b/services/audiopolicy/common/managerdefinitions/include/IVolumeCurves.h
new file mode 100644
index 0000000..93022fb
--- /dev/null
+++ b/services/audiopolicy/common/managerdefinitions/include/IVolumeCurves.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2018 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 <system/audio.h>
+#include <Volume.h>
+#include <utils/Errors.h>
+#include <utils/String8.h>
+#include <vector>
+
+namespace android {
+
+class IVolumeCurves
+{
+public:
+    virtual ~IVolumeCurves() = default;
+
+    virtual void clearCurrentVolumeIndex() = 0;
+    virtual void addCurrentVolumeIndex(audio_devices_t device, int index) = 0;
+    virtual bool canBeMuted() const = 0;
+    virtual int getVolumeIndexMin() const = 0;
+    virtual int getVolumeIndex(audio_devices_t device) const = 0;
+    virtual int getVolumeIndexMax() const = 0;
+    virtual float volIndexToDb(device_category device, int indexInUi) const = 0;
+    virtual bool hasVolumeIndexForDevice(audio_devices_t device) const = 0;
+    virtual status_t initVolume(int indexMin, int indexMax) = 0;
+    virtual void dump(String8 *dst, int spaces = 0, bool curvePoints = false) const = 0;
+};
+
+} // namespace android
diff --git a/services/audiopolicy/common/managerdefinitions/include/IVolumeCurvesCollection.h b/services/audiopolicy/common/managerdefinitions/include/IVolumeCurvesCollection.h
deleted file mode 100644
index 750da55..0000000
--- a/services/audiopolicy/common/managerdefinitions/include/IVolumeCurvesCollection.h
+++ /dev/null
@@ -1,54 +0,0 @@
-/*
- * 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 <system/audio.h>
-#include <Volume.h>
-#include <utils/Errors.h>
-#include <utils/String8.h>
-
-namespace android {
-
-class IVolumeCurvesCollection
-{
-public:
-    virtual ~IVolumeCurvesCollection() = default;
-
-    virtual void clearCurrentVolumeIndex(audio_stream_type_t stream) = 0;
-    virtual void addCurrentVolumeIndex(audio_stream_type_t stream, audio_devices_t device,
-                                       int index) = 0;
-    virtual bool canBeMuted(audio_stream_type_t stream) = 0;
-    virtual int getVolumeIndexMin(audio_stream_type_t stream) const = 0;
-    virtual int getVolumeIndex(audio_stream_type_t stream, audio_devices_t device) = 0;
-    virtual int getVolumeIndexMax(audio_stream_type_t stream) const = 0;
-    virtual float volIndexToDb(audio_stream_type_t stream, device_category device,
-                               int indexInUi) const = 0;
-    virtual status_t initStreamVolume(audio_stream_type_t stream, int indexMin, int indexMax) = 0;
-
-    virtual void initializeVolumeCurves(bool /*isSpeakerDrcEnabled*/) {}
-    virtual void switchVolumeCurve(audio_stream_type_t src, audio_stream_type_t dst) = 0;
-    virtual void restoreOriginVolumeCurve(audio_stream_type_t stream)
-    {
-        switchVolumeCurve(stream, stream);
-    }
-    virtual bool hasVolumeIndexForDevice(audio_stream_type_t stream,
-                                         audio_devices_t device) const = 0;
-
-    virtual void dump(String8 *dst) const = 0;
-};
-
-} // namespace android
diff --git a/services/audiopolicy/common/managerdefinitions/include/VolumeCurve.h b/services/audiopolicy/common/managerdefinitions/include/VolumeCurve.h
deleted file mode 100644
index 76ec198..0000000
--- a/services/audiopolicy/common/managerdefinitions/include/VolumeCurve.h
+++ /dev/null
@@ -1,239 +0,0 @@
-/*
- * 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 "IVolumeCurvesCollection.h"
-#include <policy.h>
-#include <utils/RefBase.h>
-#include <utils/String8.h>
-#include <utils/SortedVector.h>
-#include <utils/KeyedVector.h>
-#include <system/audio.h>
-#include <cutils/config_utils.h>
-#include <string>
-#include <utility>
-
-namespace android {
-
-struct CurvePoint
-{
-    CurvePoint() {}
-    CurvePoint(int index, int attenuationInMb) :
-        mIndex(index), mAttenuationInMb(attenuationInMb) {}
-    uint32_t mIndex;
-    int mAttenuationInMb;
-};
-
-inline bool operator< (const CurvePoint &lhs, const CurvePoint &rhs)
-{
-    return lhs.mIndex < rhs.mIndex;
-}
-
-// A volume curve for a given use case and device category
-// It contains of list of points of this curve expressing the attenuation in Millibels for
-// a given volume index from 0 to 100
-class VolumeCurve : public RefBase
-{
-public:
-    VolumeCurve(device_category device, audio_stream_type_t stream) :
-        mDeviceCategory(device), mStreamType(stream) {}
-
-    device_category getDeviceCategory() const { return mDeviceCategory; }
-    audio_stream_type_t getStreamType() const { return mStreamType; }
-
-    void add(const CurvePoint &point) { mCurvePoints.add(point); }
-
-    float volIndexToDb(int indexInUi, int volIndexMin, int volIndexMax) const;
-
-    void dump(String8 *result) const;
-
-private:
-    SortedVector<CurvePoint> mCurvePoints;
-    device_category mDeviceCategory;
-    audio_stream_type_t mStreamType;
-};
-
-// Volume Curves for a given use case indexed by device category
-class VolumeCurvesForStream : public KeyedVector<device_category, sp<VolumeCurve> >
-{
-public:
-    VolumeCurvesForStream() : mIndexMin(0), mIndexMax(1), mCanBeMuted(true)
-    {
-        mIndexCur.add(AUDIO_DEVICE_OUT_DEFAULT_FOR_VOLUME, 0);
-    }
-
-    sp<VolumeCurve> getCurvesFor(device_category device) const
-    {
-        if (indexOfKey(device) < 0) {
-            return 0;
-        }
-        return valueFor(device);
-    }
-
-    int getVolumeIndex(audio_devices_t device) const
-    {
-        device = Volume::getDeviceForVolume(device);
-        // there is always a valid entry for AUDIO_DEVICE_OUT_DEFAULT_FOR_VOLUME
-        if (mIndexCur.indexOfKey(device) < 0) {
-            device = AUDIO_DEVICE_OUT_DEFAULT_FOR_VOLUME;
-        }
-        return mIndexCur.valueFor(device);
-    }
-
-    bool canBeMuted() const { return mCanBeMuted; }
-    void clearCurrentVolumeIndex() { mIndexCur.clear(); }
-    void addCurrentVolumeIndex(audio_devices_t device, int index) { mIndexCur.add(device, index); }
-
-    void setVolumeIndexMin(int volIndexMin) { mIndexMin = volIndexMin; }
-    int getVolumeIndexMin() const { return mIndexMin; }
-
-    void setVolumeIndexMax(int volIndexMax) { mIndexMax = volIndexMax; }
-    int getVolumeIndexMax() const { return mIndexMax; }
-
-    bool hasVolumeIndexForDevice(audio_devices_t device) const
-    {
-        device = Volume::getDeviceForVolume(device);
-        return mIndexCur.indexOfKey(device) >= 0;
-    }
-
-    const sp<VolumeCurve> getOriginVolumeCurve(device_category deviceCategory) const
-    {
-        ALOG_ASSERT(mOriginVolumeCurves.indexOfKey(deviceCategory) >= 0, "Invalid device category");
-        return mOriginVolumeCurves.valueFor(deviceCategory);
-    }
-    void setVolumeCurve(device_category deviceCategory, const sp<VolumeCurve> &volumeCurve)
-    {
-        ALOG_ASSERT(indexOfKey(deviceCategory) >= 0, "Invalid device category for Volume Curve");
-        replaceValueFor(deviceCategory, volumeCurve);
-    }
-
-    ssize_t add(const sp<VolumeCurve> &volumeCurve)
-    {
-        device_category deviceCategory = volumeCurve->getDeviceCategory();
-        ssize_t index = indexOfKey(deviceCategory);
-        if (index < 0) {
-            // Keep track of original Volume Curves per device category in order to switch curves.
-            mOriginVolumeCurves.add(deviceCategory, volumeCurve);
-            return KeyedVector::add(deviceCategory, volumeCurve);
-        }
-        return index;
-    }
-
-    float volIndexToDb(device_category deviceCat, int indexInUi) const
-    {
-        sp<VolumeCurve> vc = getCurvesFor(deviceCat);
-        if (vc != 0) {
-            return vc->volIndexToDb(indexInUi, mIndexMin, mIndexMax);
-        } else {
-            ALOGE("Invalid device category %d for Volume Curve", deviceCat);
-            return 0.0f;
-        }
-    }
-
-    void dump(String8 *dst, int spaces, bool curvePoints = false) const;
-
-private:
-    KeyedVector<device_category, sp<VolumeCurve> > mOriginVolumeCurves;
-    KeyedVector<audio_devices_t, int> mIndexCur; /**< current volume index per device. */
-    int mIndexMin; /**< min volume index. */
-    int mIndexMax; /**< max volume index. */
-    bool mCanBeMuted; /**< true is the stream can be muted. */
-};
-
-// Collection of Volume Curves indexed by use case
-class VolumeCurvesCollection : public KeyedVector<audio_stream_type_t, VolumeCurvesForStream>,
-                               public IVolumeCurvesCollection
-{
-public:
-    VolumeCurvesCollection()
-    {
-        // Create an empty collection of curves
-        for (ssize_t i = 0 ; i < AUDIO_STREAM_CNT; i++) {
-            audio_stream_type_t stream = static_cast<audio_stream_type_t>(i);
-            KeyedVector::add(stream, VolumeCurvesForStream());
-        }
-    }
-
-    // Once XML has been parsed, must be call first to sanity check table and initialize indexes
-    virtual status_t initStreamVolume(audio_stream_type_t stream, int indexMin, int indexMax)
-    {
-        editValueAt(stream).setVolumeIndexMin(indexMin);
-        editValueAt(stream).setVolumeIndexMax(indexMax);
-        return NO_ERROR;
-    }
-    virtual void clearCurrentVolumeIndex(audio_stream_type_t stream)
-    {
-        editCurvesFor(stream).clearCurrentVolumeIndex();
-    }
-    virtual void addCurrentVolumeIndex(audio_stream_type_t stream, audio_devices_t device, int index)
-    {
-        editCurvesFor(stream).addCurrentVolumeIndex(device, index);
-    }
-    virtual bool canBeMuted(audio_stream_type_t stream) { return getCurvesFor(stream).canBeMuted(); }
-
-    virtual int getVolumeIndexMin(audio_stream_type_t stream) const
-    {
-        return getCurvesFor(stream).getVolumeIndexMin();
-    }
-    virtual int getVolumeIndexMax(audio_stream_type_t stream) const
-    {
-        return getCurvesFor(stream).getVolumeIndexMax();
-    }
-    virtual int getVolumeIndex(audio_stream_type_t stream, audio_devices_t device)
-    {
-        return getCurvesFor(stream).getVolumeIndex(device);
-    }
-    virtual void switchVolumeCurve(audio_stream_type_t streamSrc, audio_stream_type_t streamDst)
-    {
-        const VolumeCurvesForStream &sourceCurves = getCurvesFor(streamSrc);
-        VolumeCurvesForStream &dstCurves = editCurvesFor(streamDst);
-        ALOG_ASSERT(sourceCurves.size() == dstCurves.size(), "device category not aligned");
-        for (size_t index = 0; index < sourceCurves.size(); index++) {
-            device_category cat = sourceCurves.keyAt(index);
-            dstCurves.setVolumeCurve(cat, sourceCurves.getOriginVolumeCurve(cat));
-        }
-    }
-    virtual float volIndexToDb(audio_stream_type_t stream, device_category cat, int indexInUi) const
-    {
-        return getCurvesFor(stream).volIndexToDb(cat, indexInUi);
-    }
-    virtual bool hasVolumeIndexForDevice(audio_stream_type_t stream,
-                                         audio_devices_t device) const
-    {
-        return getCurvesFor(stream).hasVolumeIndexForDevice(device);
-    }
-
-    void dump(String8 *dst) const override;
-
-    ssize_t add(const sp<VolumeCurve> &volumeCurve)
-    {
-        audio_stream_type_t streamType = volumeCurve->getStreamType();
-        return editCurvesFor(streamType).add(volumeCurve);
-    }
-    VolumeCurvesForStream &editCurvesFor(audio_stream_type_t stream)
-    {
-        ALOG_ASSERT(indexOfKey(stream) >= 0, "Invalid stream type for Volume Curve");
-        return editValueAt(stream);
-    }
-    const VolumeCurvesForStream &getCurvesFor(audio_stream_type_t stream) const
-    {
-        ALOG_ASSERT(indexOfKey(stream) >= 0, "Invalid stream type for Volume Curve");
-        return valueFor(stream);
-    }
-};
-
-} // namespace android
diff --git a/services/audiopolicy/common/managerdefinitions/src/Serializer.cpp b/services/audiopolicy/common/managerdefinitions/src/Serializer.cpp
index 98d375c..81d3968 100644
--- a/services/audiopolicy/common/managerdefinitions/src/Serializer.cpp
+++ b/services/audiopolicy/common/managerdefinitions/src/Serializer.cpp
@@ -201,25 +201,6 @@
     static status_t deserialize(const xmlNode *root, AudioPolicyConfig *config);
 };
 
-struct VolumeTraits : public AndroidCollectionTraits<VolumeCurve, VolumeCurvesCollection>
-{
-    static constexpr const char *tag = "volume";
-    static constexpr const char *collectionTag = "volumes";
-    static constexpr const char *volumePointTag = "point";
-    static constexpr const char *referenceTag = "reference";
-
-    struct Attributes
-    {
-        static constexpr const char *stream = "stream";
-        static constexpr const char *deviceCategory = "deviceCategory";
-        static constexpr const char *reference = "ref";
-        static constexpr const char *referenceName = "name";
-    };
-
-    static Return<Element> deserialize(const xmlNode *cur, PtrSerializingCtx serializingContext);
-    // No Children
-};
-
 struct SurroundSoundTraits
 {
     static constexpr const char *tag = "surroundSound";
@@ -703,67 +684,6 @@
     return NO_ERROR;
 }
 
-Return<VolumeTraits::Element> VolumeTraits::deserialize(const xmlNode *cur,
-        PtrSerializingCtx /*serializingContext*/)
-{
-    std::string streamTypeLiteral = getXmlAttribute(cur, Attributes::stream);
-    if (streamTypeLiteral.empty()) {
-        ALOGE("%s: No %s found", __func__, Attributes::stream);
-        return Status::fromStatusT(BAD_VALUE);
-    }
-    audio_stream_type_t streamType;
-    if (!StreamTypeConverter::fromString(streamTypeLiteral, streamType)) {
-        ALOGE("%s: Invalid %s", __func__, Attributes::stream);
-        return Status::fromStatusT(BAD_VALUE);
-    }
-    std::string deviceCategoryLiteral = getXmlAttribute(cur, Attributes::deviceCategory);
-    if (deviceCategoryLiteral.empty()) {
-        ALOGE("%s: No %s found", __func__, Attributes::deviceCategory);
-        return Status::fromStatusT(BAD_VALUE);
-    }
-    device_category deviceCategory;
-    if (!DeviceCategoryConverter::fromString(deviceCategoryLiteral, deviceCategory)) {
-        ALOGE("%s: Invalid %s=%s", __func__, Attributes::deviceCategory,
-              deviceCategoryLiteral.c_str());
-        return Status::fromStatusT(BAD_VALUE);
-    }
-
-    std::string referenceName = getXmlAttribute(cur, Attributes::reference);
-    const xmlNode *ref = NULL;
-    if (!referenceName.empty()) {
-        ref = getReference<VolumeTraits>(cur->parent, referenceName);
-        if (ref == NULL) {
-            ALOGE("%s: No reference Ptr found for %s", __func__, referenceName.c_str());
-            return Status::fromStatusT(BAD_VALUE);
-        }
-    }
-
-    Element volCurve = new VolumeCurve(deviceCategory, streamType);
-
-    for (const xmlNode *child = referenceName.empty() ? cur->xmlChildrenNode : ref->xmlChildrenNode;
-         child != NULL; child = child->next) {
-        if (!xmlStrcmp(child->name, reinterpret_cast<const xmlChar*>(volumePointTag))) {
-            auto pointDefinition = make_xmlUnique(xmlNodeListGetString(
-                            child->doc, child->xmlChildrenNode, 1));
-            if (pointDefinition == nullptr) {
-                return Status::fromStatusT(BAD_VALUE);
-            }
-            ALOGV("%s: %s=%s",
-                    __func__, tag, reinterpret_cast<const char*>(pointDefinition.get()));
-            std::vector<int32_t> point;
-            collectionFromString<DefaultTraits<int32_t>>(
-                    reinterpret_cast<const char*>(pointDefinition.get()), point, ",");
-            if (point.size() != 2) {
-                ALOGE("%s: Invalid %s: %s", __func__, volumePointTag,
-                        reinterpret_cast<const char*>(pointDefinition.get()));
-                return Status::fromStatusT(BAD_VALUE);
-            }
-            volCurve->add(CurvePoint(point[0], point[1]));
-        }
-    }
-    return volCurve;
-}
-
 status_t SurroundSoundTraits::deserialize(const xmlNode *root, AudioPolicyConfig *config)
 {
     config->setDefaultSurroundFormats();
@@ -851,14 +771,6 @@
     }
     config->setHwModules(modules);
 
-    // deserialize volume section
-    VolumeTraits::Collection volumes;
-    status = deserializeCollection<VolumeTraits>(root, &volumes, config);
-    if (status != NO_ERROR) {
-        return status;
-    }
-    config->setVolumes(volumes);
-
     // Global Configuration
     GlobalConfigTraits::deserialize(root, config);
 
diff --git a/services/audiopolicy/config/audio_policy_configuration.xml b/services/audiopolicy/config/audio_policy_configuration.xml
index 42c52de..b4cc1d3 100644
--- a/services/audiopolicy/config/audio_policy_configuration.xml
+++ b/services/audiopolicy/config/audio_policy_configuration.xml
@@ -191,7 +191,11 @@
     </modules>
     <!-- End of Modules section -->
 
-    <!-- Volume section -->
+    <!-- Volume section:
+        IMPORTANT NOTE: Volume tables have been moved to engine configuration.
+                        Keep it here for legacy.
+                        Engine will fallback on these files if none are provided by engine.
+     -->
 
     <xi:include href="audio_policy_volumes.xml"/>
     <xi:include href="default_volume_tables.xml"/>
diff --git a/services/audiopolicy/config/audio_policy_configuration_generic.xml b/services/audiopolicy/config/audio_policy_configuration_generic.xml
index 40dcc22..9ad609d 100644
--- a/services/audiopolicy/config/audio_policy_configuration_generic.xml
+++ b/services/audiopolicy/config/audio_policy_configuration_generic.xml
@@ -30,7 +30,11 @@
     </modules>
     <!-- End of Modules section -->
 
-    <!-- Volume section -->
+    <!-- Volume section:
+        IMPORTANT NOTE: Volume tables have been moved to engine configuration.
+                        Keep it here for legacy.
+                        Engine will fallback on these files if none are provided by engine.
+     -->
 
     <xi:include href="audio_policy_volumes.xml"/>
     <xi:include href="default_volume_tables.xml"/>
diff --git a/services/audiopolicy/engine/common/include/EngineBase.h b/services/audiopolicy/engine/common/include/EngineBase.h
index 5c33fb3..bc027e2 100644
--- a/services/audiopolicy/engine/common/include/EngineBase.h
+++ b/services/audiopolicy/engine/common/include/EngineBase.h
@@ -19,6 +19,7 @@
 #include <EngineConfig.h>
 #include <AudioPolicyManagerInterface.h>
 #include <ProductStrategy.h>
+#include <StreamVolumeCurves.h>
 
 namespace android {
 namespace audio_policy {
@@ -67,6 +68,10 @@
 
     status_t listAudioProductStrategies(AudioProductStrategyVector &strategies) const override;
 
+    VolumeCurves *getVolumeCurvesForAttributes(const audio_attributes_t &attr) override;
+
+    VolumeCurves *getVolumeCurvesForStreamType(audio_stream_type_t stream) override;
+
     void dump(String8 *dst) const override;
 
 
@@ -87,7 +92,16 @@
         return is_state_in_call(getPhoneState());
     }
 
-private:
+    VolumeSource toVolumeSource(audio_stream_type_t stream) const
+    {
+        return static_cast<VolumeSource>(stream);
+    }
+
+    status_t switchVolumeCurve(audio_stream_type_t streamSrc, audio_stream_type_t streamDst);
+
+    status_t restoreOriginVolumeCurve(audio_stream_type_t stream);
+
+ private:
     AudioPolicyManagerObserver *mApmObserver = nullptr;
 
     ProductStrategyMap mProductStrategies;
@@ -95,6 +109,8 @@
 
     /** current forced use configuration. */
     audio_policy_forced_cfg_t mForceUse[AUDIO_POLICY_FORCE_USE_CNT] = {};
+
+    StreamVolumeCurves mStreamVolumeCurves;
 };
 
 } // namespace audio_policy
diff --git a/services/audiopolicy/engine/common/include/StreamVolumeCurves.h b/services/audiopolicy/engine/common/include/StreamVolumeCurves.h
new file mode 100644
index 0000000..5b0b7d6
--- /dev/null
+++ b/services/audiopolicy/engine/common/include/StreamVolumeCurves.h
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2018 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 <VolumeCurve.h>
+#include <map>
+
+namespace android {
+
+class StreamVolumeCurves
+{
+public:
+    StreamVolumeCurves() = default;
+
+    /**
+     * @brief switchVolumeCurve control API for Engine, allows to switch the volume curves
+     * from one stream type to another.
+     * @param src source stream type
+     * @param dst destination stream type
+     */
+    status_t switchVolumeCurve(audio_stream_type_t streamSrc, audio_stream_type_t streamDst)
+    {
+        if (!hasCurvesFor(streamSrc) || !hasCurvesFor(streamDst)) {
+            ALOGE("%s: No curves defined for streams %d %d", __FUNCTION__, streamSrc, streamDst);
+            return NO_INIT;
+        }
+        const VolumeCurves &sourceCurves = getCurvesFor(streamSrc);
+        VolumeCurves &dstCurves = editCurvesFor(streamDst);
+        return dstCurves.switchCurvesFrom(sourceCurves);
+    }
+    void dump(String8 *dst, int spaces = 0) const;
+
+    void add(const VolumeCurves &curves, audio_stream_type_t streamType)
+    {
+        mCurves.emplace(streamType, curves);
+    }
+
+    bool hasCurvesFor(audio_stream_type_t stream)
+    {
+        return mCurves.find(stream) != end(mCurves);
+    }
+
+    VolumeCurves &editCurvesFor(audio_stream_type_t stream)
+    {
+        ALOG_ASSERT(mCurves.find(stream) != end(mCurves), "Invalid stream type for Volume Curve");
+        return mCurves[stream];
+    }
+    const VolumeCurves &getCurvesFor(audio_stream_type_t stream) const
+    {
+        ALOG_ASSERT(mCurves.find(stream) != end(mCurves), "Invalid stream type for Volume Curve");
+        return mCurves.at(stream);
+    }
+    /**
+     * @brief getVolumeCurvesForStream
+     * @param stream type for which the volume curves interface is requested
+     * @return the VolumeCurves for a given stream type.
+     */
+    VolumeCurves &getVolumeCurvesForStream(audio_stream_type_t stream)
+    {
+        ALOG_ASSERT(mCurves.find(stream) != end(mCurves), "Invalid stream type for Volume Curve");
+        return mCurves[stream];
+    }
+    /**
+     * @brief restoreOriginVolumeCurve helper control API for engine to restore the original volume
+     * curves for a given stream type
+     * @param stream for which the volume curves will be restored.
+     */
+    status_t restoreOriginVolumeCurve(audio_stream_type_t stream)
+    {
+        if (!hasCurvesFor(stream)) {
+            ALOGE("%s: No curves defined for streams", __FUNCTION__);
+            return NO_INIT;
+        }
+        return switchVolumeCurve(stream, stream);
+    }
+
+private:
+    std::map<audio_stream_type_t, VolumeCurves> mCurves;
+};
+
+} // namespace android
diff --git a/services/audiopolicy/engine/common/include/VolumeCurve.h b/services/audiopolicy/engine/common/include/VolumeCurve.h
new file mode 100644
index 0000000..c2a1da7
--- /dev/null
+++ b/services/audiopolicy/engine/common/include/VolumeCurve.h
@@ -0,0 +1,192 @@
+/*
+ * 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 "IVolumeCurves.h"
+#include <policy.h>
+#include <utils/RefBase.h>
+#include <utils/String8.h>
+#include <utils/SortedVector.h>
+#include <utils/KeyedVector.h>
+#include <system/audio.h>
+#include <cutils/config_utils.h>
+#include <string>
+#include <map>
+#include <utility>
+
+namespace android {
+
+struct CurvePoint
+{
+    CurvePoint() {}
+    CurvePoint(int index, int attenuationInMb) :
+        mIndex(index), mAttenuationInMb(attenuationInMb) {}
+    uint32_t mIndex;
+    int mAttenuationInMb;
+};
+
+inline bool operator< (const CurvePoint &lhs, const CurvePoint &rhs)
+{
+    return lhs.mIndex < rhs.mIndex;
+}
+
+// A volume curve for a given use case and device category
+// It contains of list of points of this curve expressing the attenuation in Millibels for
+// a given volume index from 0 to 100
+class VolumeCurve : public RefBase
+{
+public:
+    VolumeCurve(device_category device) : mDeviceCategory(device) {}
+
+    void add(const CurvePoint &point) { mCurvePoints.add(point); }
+
+    float volIndexToDb(int indexInUi, int volIndexMin, int volIndexMax) const;
+
+    void dump(String8 *dst, int spaces = 0, bool curvePoints = false) const;
+
+    device_category getDeviceCategory() const { return mDeviceCategory; }
+
+private:
+    const device_category mDeviceCategory;
+    SortedVector<CurvePoint> mCurvePoints;
+};
+
+// Volume Curves for a given use case indexed by device category
+class VolumeCurves : public KeyedVector<device_category, sp<VolumeCurve> >,
+                     public IVolumeCurves
+{
+public:
+    VolumeCurves(int indexMin = 0, int indexMax = 100) :
+        mIndexMin(indexMin), mIndexMax(indexMax), mStream(AUDIO_STREAM_DEFAULT)
+    {
+        addCurrentVolumeIndex(AUDIO_DEVICE_OUT_DEFAULT_FOR_VOLUME, 0);
+    }
+    VolumeCurves(audio_stream_type_t stream, int indexMin, int indexMax) :
+        mIndexMin(indexMin), mIndexMax(indexMax), mStream(stream)
+    {
+        addCurrentVolumeIndex(AUDIO_DEVICE_OUT_DEFAULT_FOR_VOLUME, 0);
+    }
+
+    // Once XML has been parsed, must be call first to sanity check table and initialize indexes
+    virtual status_t initVolume(int indexMin, int indexMax)
+    {
+        mIndexMin = indexMin;
+        mIndexMax = indexMax;
+        return NO_ERROR;
+    }
+
+    sp<VolumeCurve> getCurvesFor(device_category device) const
+    {
+        if (indexOfKey(device) < 0) {
+            return 0;
+        }
+        return valueFor(device);
+    }
+
+    virtual int getVolumeIndex(audio_devices_t device) const
+    {
+        device = Volume::getDeviceForVolume(device);
+        // there is always a valid entry for AUDIO_DEVICE_OUT_DEFAULT_FOR_VOLUME
+        if (mIndexCur.find(device) == end(mIndexCur)) {
+            device = AUDIO_DEVICE_OUT_DEFAULT_FOR_VOLUME;
+        }
+        return mIndexCur.at(device);
+    }
+
+    virtual bool canBeMuted() const { return mCanBeMuted; }
+    virtual void clearCurrentVolumeIndex() { mIndexCur.clear(); }
+    void addCurrentVolumeIndex(audio_devices_t device, int index) override
+    {
+        mIndexCur[device] = index;
+    }
+
+    int getVolumeIndexMin() const { return mIndexMin; }
+
+    int getVolumeIndexMax() const { return mIndexMax; }
+
+    bool hasVolumeIndexForDevice(audio_devices_t device) const
+    {
+        device = Volume::getDeviceForVolume(device);
+        return mIndexCur.find(device) != end(mIndexCur);
+    }
+
+    status_t switchCurvesFrom(const VolumeCurves &referenceCurves)
+    {
+        if (size() != referenceCurves.size()) {
+            ALOGE("%s! device category not aligned, cannot switch", __FUNCTION__);
+            return BAD_TYPE;
+        }
+        for (size_t index = 0; index < size(); index++) {
+            device_category cat = keyAt(index);
+            setVolumeCurve(cat, referenceCurves.getOriginVolumeCurve(cat));
+        }
+        return NO_ERROR;
+    }
+    status_t restoreOriginVolumeCurve()
+    {
+        return switchCurvesFrom(*this);
+    }
+
+    const sp<VolumeCurve> getOriginVolumeCurve(device_category deviceCategory) const
+    {
+        ALOG_ASSERT(mOriginVolumeCurves.indexOfKey(deviceCategory) >= 0, "Invalid device category");
+        return mOriginVolumeCurves.valueFor(deviceCategory);
+    }
+    void setVolumeCurve(device_category deviceCategory, const sp<VolumeCurve> &volumeCurve)
+    {
+        ALOG_ASSERT(indexOfKey(deviceCategory) >= 0, "Invalid device category for Volume Curve");
+        replaceValueFor(deviceCategory, volumeCurve);
+    }
+
+    ssize_t add(const sp<VolumeCurve> &volumeCurve)
+    {
+        device_category deviceCategory = volumeCurve->getDeviceCategory();
+        ssize_t index = indexOfKey(deviceCategory);
+        if (index < 0) {
+            // Keep track of original Volume Curves per device category in order to switch curves.
+            mOriginVolumeCurves.add(deviceCategory, volumeCurve);
+            return KeyedVector::add(deviceCategory, volumeCurve);
+        }
+        return index;
+    }
+
+    virtual float volIndexToDb(device_category deviceCat, int indexInUi) const
+    {
+        sp<VolumeCurve> vc = getCurvesFor(deviceCat);
+        if (vc != 0) {
+            return vc->volIndexToDb(indexInUi, mIndexMin, mIndexMax);
+        } else {
+            ALOGE("Invalid device category %d for Volume Curve", deviceCat);
+            return 0.0f;
+        }
+    }
+
+    audio_stream_type_t getStreamType() const { return mStream; }
+
+    void dump(String8 *dst, int spaces = 0, bool curvePoints = false) const override;
+
+private:
+    KeyedVector<device_category, sp<VolumeCurve> > mOriginVolumeCurves;
+    std::map<audio_devices_t, int> mIndexCur; /**< current volume index per device. */
+    /*const*/ int mIndexMin; /**< min volume index. */
+    /*const*/ int mIndexMax; /**< max volume index. */
+    const bool mCanBeMuted = true; /**< true is the stream can be muted. */
+
+    const audio_stream_type_t mStream; /**< Keep it for legacy. */
+};
+
+} // namespace android
diff --git a/services/audiopolicy/engine/common/src/EngineBase.cpp b/services/audiopolicy/engine/common/src/EngineBase.cpp
index 755f2a8..2449b61 100644
--- a/services/audiopolicy/engine/common/src/EngineBase.cpp
+++ b/services/audiopolicy/engine/common/src/EngineBase.cpp
@@ -55,8 +55,10 @@
 
     if (!is_state_in_call(oldState) && is_state_in_call(state)) {
         ALOGV("  Entering call in setPhoneState()");
+        switchVolumeCurve(AUDIO_STREAM_VOICE_CALL, AUDIO_STREAM_DTMF);
     } else if (is_state_in_call(oldState) && !is_state_in_call(state)) {
         ALOGV("  Exiting call in setPhoneState()");
+        restoreOriginVolumeCurve(AUDIO_STREAM_DTMF);
     }
     return NO_ERROR;
 }
@@ -108,6 +110,31 @@
             productStrategies[strategyId] = strategy;
         }
     };
+    auto loadVolumeCurves = [](const auto &configVolumes, auto &streamVolumeCollection) {
+        for (auto &configVolume : configVolumes) {
+            audio_stream_type_t streamType = AUDIO_STREAM_DEFAULT;
+            if (configVolume.stream.empty() ||
+                    !StreamTypeConverter::fromString(configVolume.stream, streamType)) {
+                ALOGE("%s: Invalid stream type", __FUNCTION__);
+                continue;
+            }
+            VolumeCurves volumeCurves(streamType, configVolume.indexMin, configVolume.indexMax);
+            for (auto &configCurve : configVolume.volumeCurves) {
+                device_category deviceCategory = DEVICE_CATEGORY_SPEAKER;
+                if (!DeviceCategoryConverter::fromString(configCurve.deviceCategory,
+                                                         deviceCategory)) {
+                    ALOGE("%s: Invalid %s", __FUNCTION__, configCurve.deviceCategory.c_str());
+                    continue;
+                }
+                sp<VolumeCurve> curve = new VolumeCurve(deviceCategory);
+                for (auto &point : configCurve.curvePoints) {
+                    curve->add({point.index, point.attenuationInMb});
+                }
+                volumeCurves.add(curve);
+            }
+            streamVolumeCollection.add(volumeCurves, streamType);
+        }
+    };
 
     auto result = engineConfig::parse();
     if (result.parsedConfig == nullptr) {
@@ -116,6 +143,7 @@
     }
     ALOGE_IF(result.nbSkippedElement != 0, "skipped %zu elements", result.nbSkippedElement);
     loadProductStrategies(result.parsedConfig->productStrategies, mProductStrategies);
+    loadVolumeCurves(result.parsedConfig->volumeGroups, mStreamVolumeCurves);
     return result;
 }
 
@@ -173,9 +201,30 @@
     return NO_ERROR;
 }
 
+VolumeCurves *EngineBase::getVolumeCurvesForAttributes(const audio_attributes_t &attr)
+{
+    return &mStreamVolumeCurves.getVolumeCurvesForStream(getStreamTypeForAttributes(attr));
+}
+
+VolumeCurves *EngineBase::getVolumeCurvesForStreamType(audio_stream_type_t stream)
+{
+    return &mStreamVolumeCurves.getVolumeCurvesForStream(stream);
+}
+
+status_t EngineBase::switchVolumeCurve(audio_stream_type_t streamSrc, audio_stream_type_t streamDst)
+{
+    return mStreamVolumeCurves.switchVolumeCurve(streamSrc, streamDst);;
+}
+
+status_t EngineBase::restoreOriginVolumeCurve(audio_stream_type_t stream)
+{
+    return mStreamVolumeCurves.restoreOriginVolumeCurve(stream);
+}
+
 void EngineBase::dump(String8 *dst) const
 {
     mProductStrategies.dump(dst, 2);
+    mStreamVolumeCurves.dump(dst, 2);
 }
 
 } // namespace audio_policy
diff --git a/services/audiopolicy/engine/common/src/EngineDefaultConfig.h b/services/audiopolicy/engine/common/src/EngineDefaultConfig.h
index 3940c0c..86a59b0 100644
--- a/services/audiopolicy/engine/common/src/EngineDefaultConfig.h
+++ b/services/audiopolicy/engine/common/src/EngineDefaultConfig.h
@@ -131,10 +131,131 @@
     }
 };
 
+const engineConfig::VolumeGroups gVolumeGroups = {
+    {"voice_call", "AUDIO_STREAM_VOICE_CALL", 1, 10,
+     {
+         {"DEVICE_CATEGORY_HEADSET", { {0, -4200}, {33, -2800}, {66, -1400}, {100, 0} } },
+         {"DEVICE_CATEGORY_SPEAKER", { {0, -2400}, {33, -1600}, {66, -800}, {100, 0} } },
+         {"DEVICE_CATEGORY_EARPIECE", { {0, -2700}, {33, -1800}, {66, -900}, {100, 0} } },
+         {"DEVICE_CATEGORY_EXT_MEDIA", { {1, -5800}, {20, -4000}, {60, -1700}, {100, 0} } },
+         {"DEVICE_CATEGORY_HEARING_AID", { {1, -12700}, {20, -8000}, {60, -4000}, {100, 0} } },
+     },
+    },
+    {"system", "AUDIO_STREAM_SYSTEM", 0, 100,
+     {
+         {"DEVICE_CATEGORY_HEADSET", { {1, -3000}, {33, -2600}, {66, -2200}, {100, -1800} } },
+         {"DEVICE_CATEGORY_SPEAKER", { {1, -5100}, {57, -2800}, {71, -2500}, {85, -2300}, {100, -2100} } },
+         {"DEVICE_CATEGORY_EARPIECE", { {1, -2400}, {33, -1800}, {66, -1200}, {100, -600} } },
+         {"DEVICE_CATEGORY_EXT_MEDIA", { {1, -5800}, {20, -4000}, {60, -2100}, {100, -1000} } }, // DEFAULT_DEVICE_CATEGORY_EXT_MEDIA_VOLUME_CURVE
+         {"DEVICE_CATEGORY_HEARING_AID", { {1, -12700}, {20, -8000}, {60, -4000}, {100, 0} } }, // DEFAULT_HEARING_AID_VOLUME_CURVE
+     },
+    },
+    {"ring", "AUDIO_STREAM_RING", 0, 100,
+     {
+         {"DEVICE_CATEGORY_HEADSET", { {1, -4950}, {33, -3350}, {66, -1700}, {100, 0} } }, // DEFAULT_DEVICE_CATEGORY_HEADSET_VOLUME_CURVE
+         {"DEVICE_CATEGORY_SPEAKER", { {1, -5800}, {20, -4000}, {60, -1700}, {100, 0} } },
+         {"DEVICE_CATEGORY_EARPIECE", { {1, -4950}, {33, -3350}, {66, -1700}, {100, 0} } }, // DEFAULT_DEVICE_CATEGORY_EARPIECE_VOLUME_CURVE
+         {"DEVICE_CATEGORY_EXT_MEDIA", { {1, -5800}, {20, -4000}, {60, -2100}, {100, -1000} } }, // DEFAULT_DEVICE_CATEGORY_EXT_MEDIA_VOLUME_CURVE
+         {"DEVICE_CATEGORY_HEARING_AID", { {1, -12700}, {20, -8000}, {60, -4000}, {100, 0} } }, // DEFAULT_HEARING_AID_VOLUME_CURVE
+     },
+    },
+    {"music", "AUDIO_STREAM_MUSIC", 0, 40,
+     {
+         {"DEVICE_CATEGORY_HEADSET", { {1, -5800}, {20, -4000}, {60, -1700}, {100, 0} } }, // DEFAULT_MEDIA_VOLUME_CURVE
+         {"DEVICE_CATEGORY_SPEAKER", { {1, -5800}, {20, -4000}, {60, -1700}, {100, 0} } }, // DEFAULT_DEVICE_CATEGORY_SPEAKER_VOLUME_CURVE
+         {"DEVICE_CATEGORY_EARPIECE", { {1, -5800}, {20, -4000}, {60, -1700}, {100, 0} } }, // DEFAULT_MEDIA_VOLUME_CURVE
+         {"DEVICE_CATEGORY_EXT_MEDIA", { {1, -5800}, {20, -4000}, {60, -1700}, {100, 0} } }, // DEFAULT_MEDIA_VOLUME_CURVE
+         {"DEVICE_CATEGORY_HEARING_AID", { {1, -12700}, {20, -8000}, {60, -4000}, {100, 0} } }, // DEFAULT_HEARING_AID_VOLUME_CURVE
+     },
+    },
+    {"alarm", "AUDIO_STREAM_ALARM", 0, 100,
+     {
+         {"DEVICE_CATEGORY_HEADSET", { {0, -4950}, {33, -3350}, {66, -1700}, {100, 0} } }, // DEFAULT_NON_MUTABLE_HEADSET_VOLUME_CURVE
+         {"DEVICE_CATEGORY_SPEAKER", { {0, -5800}, {20, -4000}, {60, -1700}, {100, 0} } }, // DEFAULT_NON_MUTABLE_SPEAKER_VOLUME_CURVE
+         {"DEVICE_CATEGORY_EARPIECE", { {0, -4950}, {33, -3350}, {66, -1700}, {100, 0} } }, // DEFAULT_NON_MUTABLE_EARPIECE_VOLUME_CURVE
+         {"DEVICE_CATEGORY_EXT_MEDIA", { {0, -5800}, {20, -4000}, {60, -2100}, {100, -1000} } }, // DEFAULT_NON_MUTABLE_EXT_VOLUME_CURVE
+         {"DEVICE_CATEGORY_HEARING_AID", { {0, -12700}, {20, -8000}, {60, -4000}, {100, 0} } }, // DEFAULT_NON_MUTABLE_HEARING_AID_VOLUME_CURVE
+     },
+    },
+    {"notification", "AUDIO_STREAM_NOTIFICATION", 0, 100,
+     {
+         {"DEVICE_CATEGORY_HEADSET", { {1, -4950}, {33, -3350}, {66, -1700}, {100, 0} } }, // DEFAULT_DEVICE_CATEGORY_HEADSET_VOLUME_CURVE
+         {"DEVICE_CATEGORY_SPEAKER", { {1, -4680}, {42, -2070}, {85, -540}, {100, 0} } }, // DEFAULT_DEVICE_CATEGORY_SPEAKER_SYSTEM_VOLUME_CURVE
+         {"DEVICE_CATEGORY_EARPIECE", { {1, -4950}, {33, -3350}, {66, -1700}, {100, 0} } }, // DEFAULT_DEVICE_CATEGORY_EARPIECE_VOLUME_CURVE
+         {"DEVICE_CATEGORY_EXT_MEDIA", { {1, -5800}, {20, -4000}, {60, -2100}, {100, -1000} } }, // DEFAULT_DEVICE_CATEGORY_EXT_MEDIA_VOLUME_CURVE
+         {"DEVICE_CATEGORY_HEARING_AID", { {1, -4950}, {33, -3350}, {66, -1700}, {100, 0} } }, // DEFAULT_DEVICE_CATEGORY_HEADSET_VOLUME_CURVE
+     },
+    },
+    {"bluetooth_sco", "AUDIO_STREAM_BLUETOOTH_SCO", 1, 10,
+     {
+         {"DEVICE_CATEGORY_HEADSET", { {0, -4200}, {33, -2800}, {66, -1400}, {100, 0} } },
+         {"DEVICE_CATEGORY_SPEAKER", { {0, -2400}, {33, -1600}, {66, -800}, {100, 0} } },
+         {"DEVICE_CATEGORY_EARPIECE", { {0, -4200}, {33, -2800}, {66, -1400}, {100, 0} } },
+         {"DEVICE_CATEGORY_EXT_MEDIA", { {1, -5800}, {20, -4000}, {60, -1700}, {100, 0} } }, // DEFAULT_MEDIA_VOLUME_CURVE
+         {"DEVICE_CATEGORY_HEARING_AID", { {1, -12700}, {20, -8000}, {60, -4000}, {100, 0} } }, // DEFAULT_HEARING_AID_VOLUME_CURVE
+     },
+    },
+    {"enforced_audible", "AUDIO_STREAM_ENFORCED_AUDIBLE", 0, 100,
+     {
+         {"DEVICE_CATEGORY_HEADSET", { {1, -3000}, {33, -2600}, {66, -2200}, {100, -1800} } },
+         {"DEVICE_CATEGORY_SPEAKER", { {1, -3400}, {71, -2400}, {100, -2000} } },
+         {"DEVICE_CATEGORY_EARPIECE", { {1, -2400}, {33, -1800}, {66, -1200}, {100, -600} } }, // DEFAULT_SYSTEM_VOLUME_CURVE
+         {"DEVICE_CATEGORY_EXT_MEDIA", { {1, -5800}, {20, -4000}, {60, -2100}, {100, -1000} } }, // DEFAULT_DEVICE_CATEGORY_EXT_MEDIA_VOLUME_CURVE
+         {"DEVICE_CATEGORY_HEARING_AID", { {1, -12700}, {20, -8000}, {60, -4000}, {100, 0} } }, // DEFAULT_HEARING_AID_VOLUME_CURVE
+     },
+    },
+    {"dtmf", "AUDIO_STREAM_DTMF", 0, 100,
+     {
+         {"DEVICE_CATEGORY_HEADSET", { {1, -3000}, {33, -2600}, {66, -2200}, {100, -1800} } },
+         {"DEVICE_CATEGORY_SPEAKER", { {1, -4000}, {71, -2400}, {100, -1400} } }, // DEFAULT_SYSTEM_VOLUME_CURVE
+         {"DEVICE_CATEGORY_EARPIECE", { {1, -2400}, {33, -1800}, {66, -1200}, {100, -600} } }, // DEFAULT_SYSTEM_VOLUME_CURVE
+         {"DEVICE_CATEGORY_EXT_MEDIA", { {1, -5800}, {20, -4000}, {60, -2100}, {100, -1000} } }, // DEFAULT_DEVICE_CATEGORY_EXT_MEDIA_VOLUME_CURVE
+         {"DEVICE_CATEGORY_HEARING_AID", { {1, -12700}, {20, -8000}, {60, -4000}, {100, 0} } }, // DEFAULT_HEARING_AID_VOLUME_CURVE
+     },
+    },
+    {"tts", "AUDIO_STREAM_TTS", 0, 16,
+     {
+         {"DEVICE_CATEGORY_HEADSET", { {0, -9600}, {100, -9600} } }, // SILENT_VOLUME_CURVE
+         {"DEVICE_CATEGORY_SPEAKER", { {0, -0}, {100, 0} } }, // FULL_SCALE_VOLUME_CURVE
+         {"DEVICE_CATEGORY_EARPIECE", { {0, -9600}, {100, -9600} } }, // SILENT_VOLUME_CURVE
+         {"DEVICE_CATEGORY_EXT_MEDIA", { {0, -9600}, {100, -9600} } }, // SILENT_VOLUME_CURVE
+         {"DEVICE_CATEGORY_HEARING_AID", { {0, -9600}, {100, -9600} } }, // SILENT_VOLUME_CURVE
+     },
+    },
+    {"accessibility", "AUDIO_STREAM_ACCESSIBILITY", 1, 40,
+     {
+         {"DEVICE_CATEGORY_HEADSET", { {0, -5800}, {20, -4000}, {60, -1700}, {100, 0} } }, // DEFAULT_NON_MUTABLE_VOLUME_CURVE
+         {"DEVICE_CATEGORY_SPEAKER", { {0, -5800}, {20, -4000}, {60, -1700}, {100, 0} } }, // DEFAULT_NON_MUTABLE_SPEAKER_VOLUME_CURVE
+         {"DEVICE_CATEGORY_EARPIECE", { {0, -5800}, {20, -4000}, {60, -1700}, {100, 0} } }, // DEFAULT_NON_MUTABLE_VOLUME_CURVE
+         {"DEVICE_CATEGORY_EXT_MEDIA", { {0, -5800}, {20, -4000}, {60, -1700}, {100, 0} } }, // DEFAULT_NON_MUTABLE_VOLUME_CURVE
+         {"DEVICE_CATEGORY_HEARING_AID", { {0, -12700}, {20, -8000}, {60, -4000}, {100, 0} } }, // DEFAULT_NON_MUTABLE_HEARING_AID_VOLUME_CURVE
+     },
+    },
+    {"rerouting", "AUDIO_STREAM_REROUTING", 0, 1,
+     {
+         {"DEVICE_CATEGORY_HEADSET", { {0, -0}, {100, 0} } }, // FULL_SCALE_VOLUME_CURVE
+         {"DEVICE_CATEGORY_SPEAKER", { {0, -0}, {100, 0} } }, // FULL_SCALE_VOLUME_CURVE
+         {"DEVICE_CATEGORY_EARPIECE", { {0, -0}, {100, 0} } }, // FULL_SCALE_VOLUME_CURVE
+         {"DEVICE_CATEGORY_EXT_MEDIA", { {0, -0}, {100, 0} } }, // FULL_SCALE_VOLUME_CURVE
+         {"DEVICE_CATEGORY_HEARING_AID", { {0, -0}, {100, 0} } }, // FULL_SCALE_VOLUME_CURVE
+     },
+    },
+    {"patch", "AUDIO_STREAM_PATCH", 0, 1,
+     {
+         {"DEVICE_CATEGORY_HEADSET", { {0, -0}, {100, 0} } }, // FULL_SCALE_VOLUME_CURVE
+         {"DEVICE_CATEGORY_SPEAKER", { {0, -0}, {100, 0} } }, // FULL_SCALE_VOLUME_CURVE
+         {"DEVICE_CATEGORY_EARPIECE", { {0, -0}, {100, 0} } }, // FULL_SCALE_VOLUME_CURVE
+         {"DEVICE_CATEGORY_EXT_MEDIA", { {0, -0}, {100, 0} } }, // FULL_SCALE_VOLUME_CURVE
+         {"DEVICE_CATEGORY_HEARING_AID", { {0, -0}, {100, 0} } }, // FULL_SCALE_VOLUME_CURVE
+     },
+    },
+};
+
 const engineConfig::Config gDefaultEngineConfig = {
     1.0,
     gOrderedStrategies,
     {},
-    {}
+    {},
+    gVolumeGroups
 };
 } // namespace android
diff --git a/services/audiopolicy/engine/common/src/StreamVolumeCurves.cpp b/services/audiopolicy/engine/common/src/StreamVolumeCurves.cpp
new file mode 100644
index 0000000..fe3b000
--- /dev/null
+++ b/services/audiopolicy/engine/common/src/StreamVolumeCurves.cpp
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2018 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::Engine::StreamVolumeCurves"
+//#define LOG_NDEBUG 0
+
+#include "StreamVolumeCurves.h"
+#include <TypeConverter.h>
+
+namespace android {
+
+void StreamVolumeCurves::dump(String8 *dst, int spaces) const
+{
+    if (mCurves.empty()) {
+        return;
+    }
+    dst->appendFormat("\n%*sStreams dump:\n", spaces, "");
+    dst->appendFormat(
+                "%*sStream  Can be muted  Index Min  Index Max  Index Cur [device : index]...\n", spaces + 2, "");
+    for (const auto &streamCurve : mCurves) {
+        streamCurve.second.dump(dst, spaces + 2, false);
+    }
+    dst->appendFormat("\n%*sVolume Curves for Use Cases (aka Stream types) dump:\n", spaces, "");
+    for (const auto &streamCurve : mCurves) {
+        std::string streamTypeLiteral;
+        StreamTypeConverter::toString(streamCurve.first, streamTypeLiteral);
+        dst->appendFormat(
+                    " %s (%02d): Curve points for device category (index, attenuation in millibel)\n",
+                    streamTypeLiteral.c_str(), streamCurve.first);
+        streamCurve.second.dump(dst, spaces + 2, true);
+    }
+}
+
+} // namespace android
diff --git a/services/audiopolicy/common/managerdefinitions/src/VolumeCurve.cpp b/services/audiopolicy/engine/common/src/VolumeCurve.cpp
similarity index 68%
rename from services/audiopolicy/common/managerdefinitions/src/VolumeCurve.cpp
rename to services/audiopolicy/engine/common/src/VolumeCurve.cpp
index 2625733..be2ca73 100644
--- a/services/audiopolicy/common/managerdefinitions/src/VolumeCurve.cpp
+++ b/services/audiopolicy/engine/common/src/VolumeCurve.cpp
@@ -64,8 +64,7 @@
                     ((float)(mCurvePoints[indexInUiPosition].mIndex -
                             mCurvePoints[indexInUiPosition - 1].mIndex)) );
 
-    ALOGV("VOLUME mDeviceCategory %d, mStreamType %d vol index=[%d %d %d], dB=[%.1f %.1f %.1f]",
-            mDeviceCategory, mStreamType,
+    ALOGV("VOLUME vol index=[%d %d %d], dB=[%.1f %.1f %.1f]",
             mCurvePoints[indexInUiPosition - 1].mIndex, volIdx,
             mCurvePoints[indexInUiPosition].mIndex,
             ((float)mCurvePoints[indexInUiPosition - 1].mAttenuationInMb / 100.0f), decibels,
@@ -74,55 +73,35 @@
     return decibels;
 }
 
-void VolumeCurve::dump(String8 *dst) const
+void VolumeCurve::dump(String8 *dst, int spaces, bool curvePoints) const
 {
+    if (!curvePoints) {
+        return;
+    }
     dst->append(" {");
     for (size_t i = 0; i < mCurvePoints.size(); i++) {
-        dst->appendFormat("(%3d, %5d)",
+        dst->appendFormat("%*s (%3d, %5d)", spaces, "",
                  mCurvePoints[i].mIndex, mCurvePoints[i].mAttenuationInMb);
-        dst->append(i == (mCurvePoints.size() - 1) ? " }\n" : ", ");
+        dst->appendFormat(i == (mCurvePoints.size() - 1) ? " }\n" : ", ");
     }
 }
 
-void VolumeCurvesForStream::dump(String8 *dst, int spaces = 0, bool curvePoints) const
+void VolumeCurves::dump(String8 *dst, int spaces, bool curvePoints) const
 {
     if (!curvePoints) {
-        dst->appendFormat("%s         %02d         %02d         ",
-                 mCanBeMuted ? "true " : "false", mIndexMin, mIndexMax);
-        for (size_t i = 0; i < mIndexCur.size(); i++) {
-            dst->appendFormat("%04x : %02d, ", mIndexCur.keyAt(i), mIndexCur.valueAt(i));
+        dst->appendFormat("%*s%02d      %s         %03d        %03d        ", spaces, "",
+                          mStream, mCanBeMuted ? "true " : "false", mIndexMin, mIndexMax);
+        for (const auto &pair : mIndexCur) {
+            dst->appendFormat("%*s %04x : %02d, ", spaces, "", pair.first, pair.second);
         }
-        dst->append("\n");
+        dst->appendFormat("\n");
         return;
     }
-
     for (size_t i = 0; i < size(); i++) {
         std::string deviceCatLiteral;
         DeviceCategoryConverter::toString(keyAt(i), deviceCatLiteral);
-        dst->appendFormat("%*s %s :",
-                 spaces, "", deviceCatLiteral.c_str());
-        valueAt(i)->dump(dst);
-    }
-    dst->append("\n");
-}
-
-void VolumeCurvesCollection::dump(String8 *dst) const
-{
-    dst->append("\nStreams dump:\n");
-    dst->append(
-             " Stream  Can be muted  Index Min  Index Max  Index Cur [device : index]...\n");
-    for (size_t i = 0; i < size(); i++) {
-        dst->appendFormat(" %02zu      ", i);
-        valueAt(i).dump(dst);
-    }
-    dst->append("\nVolume Curves for Use Cases (aka Stream types) dump:\n");
-    for (size_t i = 0; i < size(); i++) {
-        std::string streamTypeLiteral;
-        StreamTypeConverter::toString(keyAt(i), streamTypeLiteral);
-        dst->appendFormat(
-                 " %s (%02zu): Curve points for device category (index, attenuation in millibel)\n",
-                 streamTypeLiteral.c_str(), i);
-        valueAt(i).dump(dst, 2, true);
+        dst->appendFormat("%*s %s :", spaces, "", deviceCatLiteral.c_str());
+        valueAt(i)->dump(dst, 2, true);
     }
 }
 
diff --git a/services/audiopolicy/engine/config/include/EngineConfig.h b/services/audiopolicy/engine/config/include/EngineConfig.h
index e18f687..f7caad2 100644
--- a/services/audiopolicy/engine/config/include/EngineConfig.h
+++ b/services/audiopolicy/engine/config/include/EngineConfig.h
@@ -45,6 +45,27 @@
 
 using AttributesGroups = std::vector<AttributesGroup>;
 
+struct CurvePoint {
+    int index;
+    int attenuationInMb;
+};
+using CurvePoints = std::vector<CurvePoint>;
+
+struct VolumeCurve {
+    std::string deviceCategory;
+    CurvePoints curvePoints;
+};
+using VolumeCurves = std::vector<VolumeCurve>;
+
+struct VolumeGroup {
+    std::string name;
+    std::string stream;
+    int indexMin;
+    int indexMax;
+    VolumeCurves volumeCurves;
+};
+using VolumeGroups = std::vector<VolumeGroup>;
+
 struct ProductStrategy {
     std::string name;
     AttributesGroups attributesGroups;
@@ -78,6 +99,7 @@
     ProductStrategies productStrategies;
     Criteria criteria;
     CriterionTypes criterionTypes;
+    VolumeGroups volumeGroups;
 };
 
 /** Result of `parse(const char*)` */
diff --git a/services/audiopolicy/engine/config/src/EngineConfig.cpp b/services/audiopolicy/engine/config/src/EngineConfig.cpp
index 3aa38cf..227ebd8 100644
--- a/services/audiopolicy/engine/config/src/EngineConfig.cpp
+++ b/services/audiopolicy/engine/config/src/EngineConfig.cpp
@@ -107,6 +107,35 @@
     static android::status_t deserialize(_xmlDoc *doc, const _xmlNode *root,
                                          Collection &collection);
 };
+struct VolumeTraits : public BaseSerializerTraits<VolumeCurve, VolumeCurves> {
+    static constexpr const char *tag = "volume";
+    static constexpr const char *collectionTag = "volumes";
+    static constexpr const char *volumePointTag = "point";
+
+    struct Attributes {
+        static constexpr const char *deviceCategory = "deviceCategory";
+        static constexpr const char *reference = "ref"; /**< For volume curves factorization. */
+    };
+
+    static android::status_t deserialize(_xmlDoc *doc, const _xmlNode *root,
+                                         Collection &collection);
+};
+struct VolumeGroupTraits : public BaseSerializerTraits<VolumeGroup, VolumeGroups> {
+    static constexpr const char *tag = "volumeGroup";
+    static constexpr const char *collectionTag = "volumeGroups";
+
+    struct Attributes {
+        static constexpr const char *name = "name";
+        static constexpr const char *stream = "stream"; // For legacy volume curves
+        static constexpr const char *indexMin = "indexMin";
+        static constexpr const char *indexMax = "indexMax";
+    };
+
+    static android::status_t deserialize(_xmlDoc *doc, const _xmlNode *root,
+                                         Collection &collection);
+};
+
+using xmlCharUnique = std::unique_ptr<xmlChar, decltype(xmlFree)>;
 
 using xmlCharUnique = std::unique_ptr<xmlChar, decltype(xmlFree)>;
 
@@ -383,6 +412,100 @@
     return NO_ERROR;
 }
 
+status_t VolumeTraits::deserialize(_xmlDoc *doc, const _xmlNode *root, Collection &volumes)
+{
+    std::string deviceCategory = getXmlAttribute(root, Attributes::deviceCategory);
+    if (deviceCategory.empty()) {
+        ALOGW("%s: No %s found", __FUNCTION__, Attributes::deviceCategory);
+    }
+
+    std::string referenceName = getXmlAttribute(root, Attributes::reference);
+    const _xmlNode *ref = NULL;
+    if (!referenceName.empty()) {
+        getReference(xmlDocGetRootElement(doc), ref, referenceName, collectionTag);
+        if (ref == NULL) {
+            ALOGE("%s: No reference Ptr found for %s", __FUNCTION__, referenceName.c_str());
+            return BAD_VALUE;
+        }
+    }
+    // Retrieve curve point from reference element if found or directly from current curve
+    CurvePoints curvePoints;
+    for (const xmlNode *child = referenceName.empty() ?
+         root->xmlChildrenNode : ref->xmlChildrenNode; child != NULL; child = child->next) {
+        if (!xmlStrcmp(child->name, (const xmlChar *)volumePointTag)) {
+            xmlCharUnique pointXml(xmlNodeListGetString(doc, child->xmlChildrenNode, 1), xmlFree);
+            if (pointXml == NULL) {
+                return BAD_VALUE;
+            }
+            ALOGV("%s: %s=%s", __func__, tag, reinterpret_cast<const char*>(pointXml.get()));
+            std::vector<int> point;
+            collectionFromString<DefaultTraits<int>>(
+                        reinterpret_cast<const char*>(pointXml.get()), point, ",");
+            if (point.size() != 2) {
+                ALOGE("%s: Invalid %s: %s", __func__, volumePointTag,
+                      reinterpret_cast<const char*>(pointXml.get()));
+                return BAD_VALUE;
+            }
+            curvePoints.push_back({point[0], point[1]});
+        }
+    }
+    volumes.push_back({ deviceCategory, curvePoints });
+    return NO_ERROR;
+}
+
+status_t VolumeGroupTraits::deserialize(_xmlDoc *doc, const _xmlNode *root, Collection &volumes)
+{
+    std::string name;
+    std::string stream = {};
+    int indexMin = 0;
+    int indexMax = 0;
+
+    for (const xmlNode *child = root->xmlChildrenNode; child != NULL; child = child->next) {
+        if (not xmlStrcmp(child->name, (const xmlChar *)Attributes::name)) {
+            xmlCharUnique nameXml(xmlNodeListGetString(doc, child->xmlChildrenNode, 1), xmlFree);
+            if (nameXml == nullptr) {
+                return BAD_VALUE;
+            }
+            name = reinterpret_cast<const char*>(nameXml.get());
+        }
+        if (not xmlStrcmp(child->name, (const xmlChar *)Attributes::stream)) {
+            xmlCharUnique streamXml(xmlNodeListGetString(doc, child->xmlChildrenNode, 1), xmlFree);
+            if (streamXml == nullptr) {
+                return BAD_VALUE;
+            }
+            stream = reinterpret_cast<const char*>(streamXml.get());
+        }
+        if (not xmlStrcmp(child->name, (const xmlChar *)Attributes::indexMin)) {
+            xmlCharUnique indexMinXml(xmlNodeListGetString(doc, child->xmlChildrenNode, 1), xmlFree);
+            if (indexMinXml == nullptr) {
+                return BAD_VALUE;
+            }
+            std::string indexMinLiteral(reinterpret_cast<const char*>(indexMinXml.get()));
+            if (!convertTo(indexMinLiteral, indexMin)) {
+                return BAD_VALUE;
+            }
+        }
+        if (not xmlStrcmp(child->name, (const xmlChar *)Attributes::indexMax)) {
+            xmlCharUnique indexMaxXml(xmlNodeListGetString(doc, child->xmlChildrenNode, 1), xmlFree);
+            if (indexMaxXml == nullptr) {
+                return BAD_VALUE;
+            }
+            std::string indexMaxLiteral(reinterpret_cast<const char*>(indexMaxXml.get()));
+            if (!convertTo(indexMaxLiteral, indexMax)) {
+                return BAD_VALUE;
+            }
+        }
+    }
+    ALOGV("%s: group=%s stream=%s indexMin=%d, indexMax=%d",
+          __func__, name.c_str(), stream.c_str(), indexMin, indexMax);
+
+    VolumeCurves groupVolumeCurves;
+    size_t skipped = 0;
+    deserializeCollection<VolumeTraits>(doc, root, groupVolumeCurves, skipped);
+    volumes.push_back({ name, stream, indexMin, indexMax, groupVolumeCurves });
+    return NO_ERROR;
+}
+
 ParsingResult parse(const char* path) {
     xmlDocPtr doc;
     doc = xmlParseFile(path);
@@ -414,6 +537,9 @@
                 doc, cur, config->criteria, nbSkippedElements);
     deserializeCollection<CriterionTypeTraits>(
                 doc, cur, config->criterionTypes, nbSkippedElements);
+    deserializeCollection<VolumeGroupTraits>(
+                doc, cur, config->volumeGroups, nbSkippedElements);
+
     return {std::move(config), nbSkippedElements};
 }
 
diff --git a/services/audiopolicy/engine/interface/AudioPolicyManagerInterface.h b/services/audiopolicy/engine/interface/AudioPolicyManagerInterface.h
index 498cc3b..c9e9507 100644
--- a/services/audiopolicy/engine/interface/AudioPolicyManagerInterface.h
+++ b/services/audiopolicy/engine/interface/AudioPolicyManagerInterface.h
@@ -18,6 +18,7 @@
 
 #include <AudioPolicyManagerObserver.h>
 #include <media/AudioProductStrategy.h>
+#include <IVolumeCurves.h>
 #include <policy.h>
 #include <Volume.h>
 #include <HwModule.h>
@@ -234,6 +235,21 @@
      */
     virtual status_t listAudioProductStrategies(AudioProductStrategyVector &strategies) const = 0;
 
+    /**
+     * @brief getVolumeCurvesForAttributes retrieves the Volume Curves interface for the
+     *        requested Audio Attributes.
+     * @param attr to be considered
+     * @return IVolumeCurves interface pointer if found, nullptr otherwise
+     */
+    virtual IVolumeCurves *getVolumeCurvesForAttributes(const audio_attributes_t &attr) = 0;
+
+    /**
+     * @brief getVolumeCurvesForStreamType retrieves the Volume Curves interface for the stream
+     * @param stream to be considered
+     * @return IVolumeCurves interface pointer if found, nullptr otherwise
+     */
+    virtual IVolumeCurves *getVolumeCurvesForStreamType(audio_stream_type_t stream) = 0;
+
     virtual void dump(String8 *dst) const = 0;
 
 protected:
diff --git a/services/audiopolicy/engine/interface/AudioPolicyManagerObserver.h b/services/audiopolicy/engine/interface/AudioPolicyManagerObserver.h
index b7902cf..43ba625 100644
--- a/services/audiopolicy/engine/interface/AudioPolicyManagerObserver.h
+++ b/services/audiopolicy/engine/interface/AudioPolicyManagerObserver.h
@@ -16,7 +16,6 @@
 
 #pragma once
 
-#include <IVolumeCurvesCollection.h>
 #include <AudioGain.h>
 #include <AudioPort.h>
 #include <AudioPatch.h>
@@ -51,8 +50,6 @@
 
     virtual const DeviceVector &getAvailableInputDevices() const = 0;
 
-    virtual IVolumeCurvesCollection &getVolumeCurves() = 0;
-
     virtual const sp<DeviceDescriptor> &getDefaultOutputDevice() const = 0;
 
 protected:
diff --git a/services/audiopolicy/engineconfigurable/Android.mk b/services/audiopolicy/engineconfigurable/Android.mk
index bbd9688..2b7e4c8 100644
--- a/services/audiopolicy/engineconfigurable/Android.mk
+++ b/services/audiopolicy/engineconfigurable/Android.mk
@@ -12,6 +12,8 @@
     src/EngineInstance.cpp \
     src/Stream.cpp \
     src/InputSource.cpp \
+    ../engine/common/src/VolumeCurve.cpp \
+    ../engine/common/src/StreamVolumeCurves.cpp \
     ../engine/common/src/ProductStrategy.cpp \
     ../engine/common/src/EngineBase.cpp
 
diff --git a/services/audiopolicy/engineconfigurable/config/example/Android.mk b/services/audiopolicy/engineconfigurable/config/example/Android.mk
index 95a2ecc..ef476f7 100644
--- a/services/audiopolicy/engineconfigurable/config/example/Android.mk
+++ b/services/audiopolicy/engineconfigurable/config/example/Android.mk
@@ -20,6 +20,8 @@
 
 LOCAL_REQUIRED_MODULES := \
     audio_policy_engine_product_strategies_phone.xml  \
+    audio_policy_engine_stream_volumes.xml \
+    audio_policy_engine_default_stream_volumes.xml \
     audio_policy_engine_criteria.xml \
     audio_policy_engine_criterion_types.xml
 
@@ -34,6 +36,22 @@
 LOCAL_SRC_FILES := phone/$(LOCAL_MODULE_STEM)
 include $(BUILD_PREBUILT)
 
+include $(CLEAR_VARS)
+LOCAL_MODULE := audio_policy_engine_stream_volumes.xml
+LOCAL_MODULE_TAGS := optional
+LOCAL_MODULE_CLASS := ETC
+LOCAL_VENDOR_MODULE := true
+LOCAL_SRC_FILES := phone/$(LOCAL_MODULE)
+include $(BUILD_PREBUILT)
+
+include $(CLEAR_VARS)
+LOCAL_MODULE := audio_policy_engine_default_stream_volumes.xml
+LOCAL_MODULE_TAGS := optional
+LOCAL_MODULE_CLASS := ETC
+LOCAL_VENDOR_MODULE := true
+LOCAL_SRC_FILES := phone/$(LOCAL_MODULE)
+include $(BUILD_PREBUILT)
+
 endif # ifeq ($(BUILD_AUDIO_POLICY_EXAMPLE_CONFIGURATION), phone_configurable)
 
 
diff --git a/services/audiopolicy/engineconfigurable/config/example/phone/audio_policy_engine_configuration.xml b/services/audiopolicy/engineconfigurable/config/example/phone/audio_policy_engine_configuration.xml
index ab61d8a..4ca33b4 100644
--- a/services/audiopolicy/engineconfigurable/config/example/phone/audio_policy_engine_configuration.xml
+++ b/services/audiopolicy/engineconfigurable/config/example/phone/audio_policy_engine_configuration.xml
@@ -17,6 +17,8 @@
 <configuration version="1.0" xmlns:xi="http://www.w3.org/2001/XInclude">
 
     <xi:include href="audio_policy_engine_product_strategies.xml"/>
+    <xi:include href="audio_policy_engine_stream_volumes.xml"/>
+    <xi:include href="audio_policy_engine_default_stream_volumes.xml"/>
 
 </configuration>
 
diff --git a/services/audiopolicy/engineconfigurable/config/example/phone/audio_policy_engine_default_stream_volumes.xml b/services/audiopolicy/engineconfigurable/config/example/phone/audio_policy_engine_default_stream_volumes.xml
new file mode 100644
index 0000000..21e6dd5
--- /dev/null
+++ b/services/audiopolicy/engineconfigurable/config/example/phone/audio_policy_engine_default_stream_volumes.xml
@@ -0,0 +1,136 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- 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.
+-->
+<!-- Default Volume Tables included by Audio Policy Configuration file -->
+<!-- Full Default Volume table for all device category -->
+<volumes>
+    <reference name="FULL_SCALE_VOLUME_CURVE">
+    <!-- Full Scale reference Volume Curve -->
+        <point>0,0</point>
+        <point>100,0</point>
+    </reference>
+    <reference name="SILENT_VOLUME_CURVE">
+        <point>0,-9600</point>
+        <point>100,-9600</point>
+    </reference>
+    <reference name="DEFAULT_SYSTEM_VOLUME_CURVE">
+    <!-- Default System reference Volume Curve -->
+        <point>1,-2400</point>
+        <point>33,-1800</point>
+        <point>66,-1200</point>
+        <point>100,-600</point>
+    </reference>
+    <reference name="DEFAULT_MEDIA_VOLUME_CURVE">
+    <!-- Default Media reference Volume Curve -->
+        <point>1,-5800</point>
+        <point>20,-4000</point>
+        <point>60,-1700</point>
+        <point>100,0</point>
+    </reference>
+    <reference name="DEFAULT_DEVICE_CATEGORY_HEADSET_VOLUME_CURVE">
+    <!--Default Volume Curve -->
+        <point>1,-4950</point>
+        <point>33,-3350</point>
+        <point>66,-1700</point>
+        <point>100,0</point>
+    </reference>
+    <reference name="DEFAULT_DEVICE_CATEGORY_SPEAKER_VOLUME_CURVE">
+    <!-- Default is Speaker Media Volume Curve -->
+        <point>1,-5800</point>
+        <point>20,-4000</point>
+        <point>60,-1700</point>
+        <point>100,0</point>
+    </reference>
+    <reference name="DEFAULT_DEVICE_CATEGORY_SPEAKER_SYSTEM_VOLUME_CURVE">
+    <!-- Default is Speaker System Volume Curve -->
+        <point>1,-4680</point>
+        <point>42,-2070</point>
+        <point>85,-540</point>
+        <point>100,0</point>
+    </reference>
+    <reference name="DEFAULT_DEVICE_CATEGORY_EARPIECE_VOLUME_CURVE">
+    <!--Default Volume Curve -->
+        <point>1,-4950</point>
+        <point>33,-3350</point>
+        <point>66,-1700</point>
+        <point>100,0</point>
+    </reference>
+    <reference name="DEFAULT_DEVICE_CATEGORY_EXT_MEDIA_VOLUME_CURVE">
+    <!-- Default is Ext Media System Volume Curve -->
+        <point>1,-5800</point>
+        <point>20,-4000</point>
+        <point>60,-2100</point>
+        <point>100,-1000</point>
+    </reference>
+    <reference name="DEFAULT_HEARING_AID_VOLUME_CURVE">
+    <!-- Default Hearing Aid Volume Curve -->
+        <point>1,-12700</point>
+        <point>20,-8000</point>
+        <point>60,-4000</point>
+        <point>100,0</point>
+    </reference>
+    <!-- **************************************************************** -->
+    <!-- Non-mutable default volume curves:                               -->
+    <!--     * first point is always for index 0                          -->
+    <!--     * attenuation is small enough that stream can still be heard -->
+    <reference name="DEFAULT_NON_MUTABLE_VOLUME_CURVE">
+    <!-- Default non-mutable reference Volume Curve -->
+    <!--        based on DEFAULT_MEDIA_VOLUME_CURVE -->
+        <point>0,-5800</point>
+        <point>20,-4000</point>
+        <point>60,-1700</point>
+        <point>100,0</point>
+    </reference>
+    <reference name="DEFAULT_NON_MUTABLE_HEADSET_VOLUME_CURVE">
+    <!--Default non-mutable Volume Curve for headset -->
+    <!--    based on DEFAULT_DEVICE_CATEGORY_HEADSET_VOLUME_CURVE -->
+        <point>0,-4950</point>
+        <point>33,-3350</point>
+        <point>66,-1700</point>
+        <point>100,0</point>
+    </reference>
+    <reference name="DEFAULT_NON_MUTABLE_SPEAKER_VOLUME_CURVE">
+    <!-- Default non-mutable Speaker Volume Curve -->
+    <!--    based on DEFAULT_DEVICE_CATEGORY_SPEAKER_VOLUME_CURVE -->
+        <point>0,-5800</point>
+        <point>20,-4000</point>
+        <point>60,-1700</point>
+        <point>100,0</point>
+    </reference>
+    <reference name="DEFAULT_NON_MUTABLE_EARPIECE_VOLUME_CURVE">
+    <!--Default non-mutable Volume Curve -->
+    <!--    based on DEFAULT_DEVICE_CATEGORY_EARPIECE_VOLUME_CURVE -->
+        <point>0,-4950</point>
+        <point>33,-3350</point>
+        <point>66,-1700</point>
+        <point>100,0</point>
+    </reference>
+    <reference name="DEFAULT_NON_MUTABLE_EXT_VOLUME_CURVE">
+    <!-- Default non-mutable Ext Media System Volume Curve -->
+    <!--     based on DEFAULT_DEVICE_CATEGORY_EXT_MEDIA_VOLUME_CURVE -->
+        <point>0,-5800</point>
+        <point>20,-4000</point>
+        <point>60,-2100</point>
+        <point>100,-1000</point>
+    </reference>
+    <reference name="DEFAULT_NON_MUTABLE_HEARING_AID_VOLUME_CURVE">
+    <!-- Default non-mutable Hearing Aid Volume Curve -->
+    <!--     based on DEFAULT_HEARING_AID_VOLUME_CURVE -->
+        <point>0,-12700</point>
+        <point>20,-8000</point>
+        <point>60,-4000</point>
+        <point>100,0</point>
+    </reference>
+</volumes>
diff --git a/services/audiopolicy/engineconfigurable/config/example/phone/audio_policy_engine_stream_volumes.xml b/services/audiopolicy/engineconfigurable/config/example/phone/audio_policy_engine_stream_volumes.xml
new file mode 100644
index 0000000..73bde1f
--- /dev/null
+++ b/services/audiopolicy/engineconfigurable/config/example/phone/audio_policy_engine_stream_volumes.xml
@@ -0,0 +1,231 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- 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.
+-->
+<!-- Volume section defines a volume curve for a given use case and device category.
+It contains a list of points of this curve expressing the attenuation in Millibels for a given
+volume index from 0 to 100.
+<volume stream=”AUDIO_STREAM_MUSIC” deviceCategory=””>
+<point>0,-9600</point>
+<point>100,0</point>
+</volume>
+-->
+
+<volumeGroups>
+    <volumeGroup>
+        <stream>AUDIO_STREAM_VOICE_CALL</stream>
+        <indexMin>1</indexMin>
+        <indexMax>7</indexMax>
+        <volume deviceCategory="DEVICE_CATEGORY_HEADSET">
+            <point>0,-4200</point>
+            <point>33,-2800</point>
+            <point>66,-1400</point>
+            <point>100,0</point>
+        </volume>
+        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER">
+            <point>0,-2400</point>
+            <point>33,-1600</point>
+            <point>66,-800</point>
+            <point>100,0</point>
+        </volume>
+        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE">
+            <point>0,-2700</point>
+            <point>33,-1800</point>
+            <point>66,-900</point>
+            <point>100,0</point>
+        </volume>
+        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA" ref="DEFAULT_MEDIA_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID" ref="DEFAULT_HEARING_AID_VOLUME_CURVE"/>
+    </volumeGroup>
+
+    <volumeGroup>
+        <stream>AUDIO_STREAM_SYSTEM</stream>
+        <indexMin>0</indexMin>
+        <indexMax>7</indexMax>
+        <volume deviceCategory="DEVICE_CATEGORY_HEADSET">
+            <point>1,-3000</point>
+            <point>33,-2600</point>
+            <point>66,-2200</point>
+            <point>100,-1800</point>
+        </volume>
+        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER">
+            <point>1,-5100</point>
+            <point>57,-2800</point>
+            <point>71,-2500</point>
+            <point>85,-2300</point>
+            <point>100,-2100</point>
+        </volume>
+        <!--volume deviceCategory="DEVICE_CATEGORY_SPEAKER" ref="DEFAULT_SYSTEM_VOLUME_CURVE"/-->
+        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE" ref="DEFAULT_SYSTEM_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA" ref="DEFAULT_DEVICE_CATEGORY_EXT_MEDIA_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID" ref="DEFAULT_HEARING_AID_VOLUME_CURVE"/>
+    </volumeGroup>
+
+    <volumeGroup>
+        <stream>AUDIO_STREAM_RING</stream>
+        <indexMin>0</indexMin>
+        <indexMax>7</indexMax>
+        <volume deviceCategory="DEVICE_CATEGORY_HEADSET" ref="DEFAULT_DEVICE_CATEGORY_HEADSET_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER" ref="DEFAULT_DEVICE_CATEGORY_SPEAKER_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE" ref="DEFAULT_DEVICE_CATEGORY_EARPIECE_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA" ref="DEFAULT_DEVICE_CATEGORY_EXT_MEDIA_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID" ref="DEFAULT_HEARING_AID_VOLUME_CURVE"/>
+    </volumeGroup>
+
+    <volumeGroup>
+        <stream>AUDIO_STREAM_MUSIC</stream>
+        <indexMin>0</indexMin>
+        <indexMax>25</indexMax>
+        <volume deviceCategory="DEVICE_CATEGORY_HEADSET" ref="DEFAULT_MEDIA_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER" ref="DEFAULT_DEVICE_CATEGORY_SPEAKER_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE" ref="DEFAULT_MEDIA_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA" ref="DEFAULT_MEDIA_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID"  ref="DEFAULT_HEARING_AID_VOLUME_CURVE"/>
+    </volumeGroup>
+
+    <volumeGroup>
+        <stream>AUDIO_STREAM_ALARM</stream>
+        <indexMin>1</indexMin>
+        <indexMax>7</indexMax>
+        <volume deviceCategory="DEVICE_CATEGORY_HEADSET" ref="DEFAULT_NON_MUTABLE_HEADSET_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER" ref="DEFAULT_NON_MUTABLE_SPEAKER_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE" ref="DEFAULT_NON_MUTABLE_EARPIECE_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA" ref="DEFAULT_NON_MUTABLE_EXT_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID" ref="DEFAULT_NON_MUTABLE_HEARING_AID_VOLUME_CURVE"/>
+    </volumeGroup>
+
+    <volumeGroup>
+        <stream>AUDIO_STREAM_NOTIFICATION</stream>
+        <indexMin>0</indexMin>
+        <indexMax>7</indexMax>
+        <volume deviceCategory="DEVICE_CATEGORY_HEADSET" ref="DEFAULT_DEVICE_CATEGORY_HEADSET_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER" ref="DEFAULT_DEVICE_CATEGORY_SPEAKER_SYSTEM_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE" ref="DEFAULT_DEVICE_CATEGORY_EARPIECE_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA" ref="DEFAULT_DEVICE_CATEGORY_EXT_MEDIA_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID" ref="DEFAULT_DEVICE_CATEGORY_HEADSET_VOLUME_CURVE"/>
+    </volumeGroup>
+
+    <volumeGroup>
+        <stream>AUDIO_STREAM_BLUETOOTH_SCO</stream>
+        <indexMin>0</indexMin>
+        <indexMax>15</indexMax>
+        <volume deviceCategory="DEVICE_CATEGORY_HEADSET">
+            <point>0,-4200</point>
+            <point>33,-2800</point>
+            <point>66,-1400</point>
+            <point>100,0</point>
+        </volume>
+        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER">
+            <point>0,-2400</point>
+            <point>33,-1600</point>
+            <point>66,-800</point>
+            <point>100,0</point>
+        </volume>
+        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE">
+            <point>0,-4200</point>
+            <point>33,-2800</point>
+            <point>66,-1400</point>
+            <point>100,0</point>
+        </volume>
+        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA" ref="DEFAULT_MEDIA_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID" ref="DEFAULT_HEARING_AID_VOLUME_CURVE"/>
+    </volumeGroup>
+
+    <volumeGroup>
+        <stream>AUDIO_STREAM_ENFORCED_AUDIBLE</stream>
+        <indexMin>0</indexMin>
+        <indexMax>7</indexMax>
+        <volume deviceCategory="DEVICE_CATEGORY_HEADSET">
+            <point>1,-3000</point>
+            <point>33,-2600</point>
+            <point>66,-2200</point>
+            <point>100,-1800</point>
+        </volume>
+        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER">
+            <point>1,-3400</point>
+            <point>71,-2400</point>
+            <point>100,-2000</point>
+        </volume>
+        <!--volume deviceCategory="DEVICE_CATEGORY_SPEAKER" ref="DEFAULT_SYSTEM_VOLUME_CURVE"/-->
+        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE" ref="DEFAULT_SYSTEM_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA" ref="DEFAULT_DEVICE_CATEGORY_EXT_MEDIA_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID" ref="DEFAULT_HEARING_AID_VOLUME_CURVE"/>
+    </volumeGroup>
+
+    <volumeGroup>
+        <stream>AUDIO_STREAM_DTMF</stream>
+        <indexMin>0</indexMin>
+        <indexMax>15</indexMax>
+        <volume deviceCategory="DEVICE_CATEGORY_HEADSET">
+            <point>1,-3000</point>
+            <point>33,-2600</point>
+            <point>66,-2200</point>
+            <point>100,-1800</point>
+        </volume>
+        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER">
+            <point>1,-4000</point>
+            <point>71,-2400</point>
+            <point>100,-1400</point>
+        </volume>
+        <!--volume deviceCategory="DEVICE_CATEGORY_SPEAKER" ref="DEFAULT_SYSTEM_VOLUME_CURVE"/-->
+        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE" ref="DEFAULT_SYSTEM_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA" ref="DEFAULT_DEVICE_CATEGORY_EXT_MEDIA_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID" ref="DEFAULT_HEARING_AID_VOLUME_CURVE"/>
+    </volumeGroup>
+
+    <volumeGroup>
+        <stream>AUDIO_STREAM_TTS</stream>
+        <indexMin>0</indexMin>
+        <indexMax>15</indexMax>
+        <volume deviceCategory="DEVICE_CATEGORY_HEADSET" ref="SILENT_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER" ref="FULL_SCALE_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE" ref="SILENT_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA" ref="SILENT_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID" ref="SILENT_VOLUME_CURVE"/>
+    </volumeGroup>
+
+    <volumeGroup>
+        <stream>AUDIO_STREAM_ACCESSIBILITY</stream>
+        <indexMin>1</indexMin>
+        <indexMax>15</indexMax>
+        <volume deviceCategory="DEVICE_CATEGORY_HEADSET" ref="DEFAULT_NON_MUTABLE_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER" ref="DEFAULT_NON_MUTABLE_SPEAKER_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE" ref="DEFAULT_NON_MUTABLE_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA" ref="DEFAULT_NON_MUTABLE_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID" ref="DEFAULT_NON_MUTABLE_HEARING_AID_VOLUME_CURVE"/>
+    </volumeGroup>
+
+    <volumeGroup>
+        <stream>AUDIO_STREAM_REROUTING</stream>
+        <indexMin>0</indexMin>
+        <indexMax>1</indexMax>
+        <volume deviceCategory="DEVICE_CATEGORY_HEADSET" ref="FULL_SCALE_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER" ref="FULL_SCALE_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE" ref="FULL_SCALE_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA" ref="FULL_SCALE_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID" ref="FULL_SCALE_VOLUME_CURVE"/>
+    </volumeGroup>
+
+    <volumeGroup>
+        <stream>AUDIO_STREAM_PATCH</stream>
+        <indexMin>0</indexMin>
+        <indexMax>1</indexMax>
+        <volume deviceCategory="DEVICE_CATEGORY_HEADSET" ref="FULL_SCALE_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER" ref="FULL_SCALE_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE" ref="FULL_SCALE_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA" ref="FULL_SCALE_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID" ref="FULL_SCALE_VOLUME_CURVE"/>
+    </volumeGroup>
+</volumeGroups>
+
diff --git a/services/audiopolicy/engineconfigurable/src/Engine.cpp b/services/audiopolicy/engineconfigurable/src/Engine.cpp
index 719ef01..89a1694 100644
--- a/services/audiopolicy/engineconfigurable/src/Engine.cpp
+++ b/services/audiopolicy/engineconfigurable/src/Engine.cpp
@@ -113,7 +113,7 @@
                                        const audio_stream_type_t &profile)
 {
     if (setPropertyForKey<audio_stream_type_t, audio_stream_type_t>(stream, profile)) {
-        getApmObserver()->getVolumeCurves().switchVolumeCurve(profile, stream);
+        switchVolumeCurve(profile, stream);
         return true;
     }
     return false;
diff --git a/services/audiopolicy/enginedefault/Android.mk b/services/audiopolicy/enginedefault/Android.mk
index 95eac1c..94fa788 100644
--- a/services/audiopolicy/enginedefault/Android.mk
+++ b/services/audiopolicy/enginedefault/Android.mk
@@ -8,6 +8,8 @@
 LOCAL_SRC_FILES := \
     src/Engine.cpp \
     src/EngineInstance.cpp \
+    ../engine/common/src/VolumeCurve.cpp \
+    ../engine/common/src/StreamVolumeCurves.cpp \
     ../engine/common/src/ProductStrategy.cpp \
     ../engine/common/src/EngineBase.cpp
 
diff --git a/services/audiopolicy/enginedefault/config/example/Android.mk b/services/audiopolicy/enginedefault/config/example/Android.mk
index 866466f..f06ee4c 100644
--- a/services/audiopolicy/enginedefault/config/example/Android.mk
+++ b/services/audiopolicy/enginedefault/config/example/Android.mk
@@ -16,7 +16,9 @@
 LOCAL_SRC_FILES := phone/$(LOCAL_MODULE_STEM)
 
 LOCAL_REQUIRED_MODULES := \
-    audio_policy_engine_product_strategies_phone.xml
+    audio_policy_engine_product_strategies_phone.xml \
+    audio_policy_engine_stream_volumes.xml \
+    audio_policy_engine_default_stream_volumes.xml
 
 include $(BUILD_PREBUILT)
 
@@ -29,4 +31,20 @@
 LOCAL_SRC_FILES := phone/$(LOCAL_MODULE_STEM)
 include $(BUILD_PREBUILT)
 
+include $(CLEAR_VARS)
+LOCAL_MODULE := audio_policy_engine_stream_volumes.xml
+LOCAL_MODULE_TAGS := optional
+LOCAL_MODULE_CLASS := ETC
+LOCAL_VENDOR_MODULE := true
+LOCAL_SRC_FILES := phone/$(LOCAL_MODULE)
+include $(BUILD_PREBUILT)
+
+include $(CLEAR_VARS)
+LOCAL_MODULE := audio_policy_engine_default_stream_volumes.xml
+LOCAL_MODULE_TAGS := optional
+LOCAL_MODULE_CLASS := ETC
+LOCAL_VENDOR_MODULE := true
+LOCAL_SRC_FILES := phone/$(LOCAL_MODULE)
+include $(BUILD_PREBUILT)
+
 endif # ifeq ($(BUILD_AUDIO_POLICY_EXAMPLE_CONFIGURATION), phone_default)
diff --git a/services/audiopolicy/enginedefault/config/example/phone/audio_policy_engine_configuration.xml b/services/audiopolicy/enginedefault/config/example/phone/audio_policy_engine_configuration.xml
index ab61d8a..4ca33b4 100644
--- a/services/audiopolicy/enginedefault/config/example/phone/audio_policy_engine_configuration.xml
+++ b/services/audiopolicy/enginedefault/config/example/phone/audio_policy_engine_configuration.xml
@@ -17,6 +17,8 @@
 <configuration version="1.0" xmlns:xi="http://www.w3.org/2001/XInclude">
 
     <xi:include href="audio_policy_engine_product_strategies.xml"/>
+    <xi:include href="audio_policy_engine_stream_volumes.xml"/>
+    <xi:include href="audio_policy_engine_default_stream_volumes.xml"/>
 
 </configuration>
 
diff --git a/services/audiopolicy/enginedefault/config/example/phone/audio_policy_engine_default_stream_volumes.xml b/services/audiopolicy/enginedefault/config/example/phone/audio_policy_engine_default_stream_volumes.xml
new file mode 100644
index 0000000..21e6dd5
--- /dev/null
+++ b/services/audiopolicy/enginedefault/config/example/phone/audio_policy_engine_default_stream_volumes.xml
@@ -0,0 +1,136 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- 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.
+-->
+<!-- Default Volume Tables included by Audio Policy Configuration file -->
+<!-- Full Default Volume table for all device category -->
+<volumes>
+    <reference name="FULL_SCALE_VOLUME_CURVE">
+    <!-- Full Scale reference Volume Curve -->
+        <point>0,0</point>
+        <point>100,0</point>
+    </reference>
+    <reference name="SILENT_VOLUME_CURVE">
+        <point>0,-9600</point>
+        <point>100,-9600</point>
+    </reference>
+    <reference name="DEFAULT_SYSTEM_VOLUME_CURVE">
+    <!-- Default System reference Volume Curve -->
+        <point>1,-2400</point>
+        <point>33,-1800</point>
+        <point>66,-1200</point>
+        <point>100,-600</point>
+    </reference>
+    <reference name="DEFAULT_MEDIA_VOLUME_CURVE">
+    <!-- Default Media reference Volume Curve -->
+        <point>1,-5800</point>
+        <point>20,-4000</point>
+        <point>60,-1700</point>
+        <point>100,0</point>
+    </reference>
+    <reference name="DEFAULT_DEVICE_CATEGORY_HEADSET_VOLUME_CURVE">
+    <!--Default Volume Curve -->
+        <point>1,-4950</point>
+        <point>33,-3350</point>
+        <point>66,-1700</point>
+        <point>100,0</point>
+    </reference>
+    <reference name="DEFAULT_DEVICE_CATEGORY_SPEAKER_VOLUME_CURVE">
+    <!-- Default is Speaker Media Volume Curve -->
+        <point>1,-5800</point>
+        <point>20,-4000</point>
+        <point>60,-1700</point>
+        <point>100,0</point>
+    </reference>
+    <reference name="DEFAULT_DEVICE_CATEGORY_SPEAKER_SYSTEM_VOLUME_CURVE">
+    <!-- Default is Speaker System Volume Curve -->
+        <point>1,-4680</point>
+        <point>42,-2070</point>
+        <point>85,-540</point>
+        <point>100,0</point>
+    </reference>
+    <reference name="DEFAULT_DEVICE_CATEGORY_EARPIECE_VOLUME_CURVE">
+    <!--Default Volume Curve -->
+        <point>1,-4950</point>
+        <point>33,-3350</point>
+        <point>66,-1700</point>
+        <point>100,0</point>
+    </reference>
+    <reference name="DEFAULT_DEVICE_CATEGORY_EXT_MEDIA_VOLUME_CURVE">
+    <!-- Default is Ext Media System Volume Curve -->
+        <point>1,-5800</point>
+        <point>20,-4000</point>
+        <point>60,-2100</point>
+        <point>100,-1000</point>
+    </reference>
+    <reference name="DEFAULT_HEARING_AID_VOLUME_CURVE">
+    <!-- Default Hearing Aid Volume Curve -->
+        <point>1,-12700</point>
+        <point>20,-8000</point>
+        <point>60,-4000</point>
+        <point>100,0</point>
+    </reference>
+    <!-- **************************************************************** -->
+    <!-- Non-mutable default volume curves:                               -->
+    <!--     * first point is always for index 0                          -->
+    <!--     * attenuation is small enough that stream can still be heard -->
+    <reference name="DEFAULT_NON_MUTABLE_VOLUME_CURVE">
+    <!-- Default non-mutable reference Volume Curve -->
+    <!--        based on DEFAULT_MEDIA_VOLUME_CURVE -->
+        <point>0,-5800</point>
+        <point>20,-4000</point>
+        <point>60,-1700</point>
+        <point>100,0</point>
+    </reference>
+    <reference name="DEFAULT_NON_MUTABLE_HEADSET_VOLUME_CURVE">
+    <!--Default non-mutable Volume Curve for headset -->
+    <!--    based on DEFAULT_DEVICE_CATEGORY_HEADSET_VOLUME_CURVE -->
+        <point>0,-4950</point>
+        <point>33,-3350</point>
+        <point>66,-1700</point>
+        <point>100,0</point>
+    </reference>
+    <reference name="DEFAULT_NON_MUTABLE_SPEAKER_VOLUME_CURVE">
+    <!-- Default non-mutable Speaker Volume Curve -->
+    <!--    based on DEFAULT_DEVICE_CATEGORY_SPEAKER_VOLUME_CURVE -->
+        <point>0,-5800</point>
+        <point>20,-4000</point>
+        <point>60,-1700</point>
+        <point>100,0</point>
+    </reference>
+    <reference name="DEFAULT_NON_MUTABLE_EARPIECE_VOLUME_CURVE">
+    <!--Default non-mutable Volume Curve -->
+    <!--    based on DEFAULT_DEVICE_CATEGORY_EARPIECE_VOLUME_CURVE -->
+        <point>0,-4950</point>
+        <point>33,-3350</point>
+        <point>66,-1700</point>
+        <point>100,0</point>
+    </reference>
+    <reference name="DEFAULT_NON_MUTABLE_EXT_VOLUME_CURVE">
+    <!-- Default non-mutable Ext Media System Volume Curve -->
+    <!--     based on DEFAULT_DEVICE_CATEGORY_EXT_MEDIA_VOLUME_CURVE -->
+        <point>0,-5800</point>
+        <point>20,-4000</point>
+        <point>60,-2100</point>
+        <point>100,-1000</point>
+    </reference>
+    <reference name="DEFAULT_NON_MUTABLE_HEARING_AID_VOLUME_CURVE">
+    <!-- Default non-mutable Hearing Aid Volume Curve -->
+    <!--     based on DEFAULT_HEARING_AID_VOLUME_CURVE -->
+        <point>0,-12700</point>
+        <point>20,-8000</point>
+        <point>60,-4000</point>
+        <point>100,0</point>
+    </reference>
+</volumes>
diff --git a/services/audiopolicy/enginedefault/config/example/phone/audio_policy_engine_stream_volumes.xml b/services/audiopolicy/enginedefault/config/example/phone/audio_policy_engine_stream_volumes.xml
new file mode 100644
index 0000000..73bde1f
--- /dev/null
+++ b/services/audiopolicy/enginedefault/config/example/phone/audio_policy_engine_stream_volumes.xml
@@ -0,0 +1,231 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- 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.
+-->
+<!-- Volume section defines a volume curve for a given use case and device category.
+It contains a list of points of this curve expressing the attenuation in Millibels for a given
+volume index from 0 to 100.
+<volume stream=”AUDIO_STREAM_MUSIC” deviceCategory=””>
+<point>0,-9600</point>
+<point>100,0</point>
+</volume>
+-->
+
+<volumeGroups>
+    <volumeGroup>
+        <stream>AUDIO_STREAM_VOICE_CALL</stream>
+        <indexMin>1</indexMin>
+        <indexMax>7</indexMax>
+        <volume deviceCategory="DEVICE_CATEGORY_HEADSET">
+            <point>0,-4200</point>
+            <point>33,-2800</point>
+            <point>66,-1400</point>
+            <point>100,0</point>
+        </volume>
+        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER">
+            <point>0,-2400</point>
+            <point>33,-1600</point>
+            <point>66,-800</point>
+            <point>100,0</point>
+        </volume>
+        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE">
+            <point>0,-2700</point>
+            <point>33,-1800</point>
+            <point>66,-900</point>
+            <point>100,0</point>
+        </volume>
+        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA" ref="DEFAULT_MEDIA_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID" ref="DEFAULT_HEARING_AID_VOLUME_CURVE"/>
+    </volumeGroup>
+
+    <volumeGroup>
+        <stream>AUDIO_STREAM_SYSTEM</stream>
+        <indexMin>0</indexMin>
+        <indexMax>7</indexMax>
+        <volume deviceCategory="DEVICE_CATEGORY_HEADSET">
+            <point>1,-3000</point>
+            <point>33,-2600</point>
+            <point>66,-2200</point>
+            <point>100,-1800</point>
+        </volume>
+        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER">
+            <point>1,-5100</point>
+            <point>57,-2800</point>
+            <point>71,-2500</point>
+            <point>85,-2300</point>
+            <point>100,-2100</point>
+        </volume>
+        <!--volume deviceCategory="DEVICE_CATEGORY_SPEAKER" ref="DEFAULT_SYSTEM_VOLUME_CURVE"/-->
+        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE" ref="DEFAULT_SYSTEM_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA" ref="DEFAULT_DEVICE_CATEGORY_EXT_MEDIA_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID" ref="DEFAULT_HEARING_AID_VOLUME_CURVE"/>
+    </volumeGroup>
+
+    <volumeGroup>
+        <stream>AUDIO_STREAM_RING</stream>
+        <indexMin>0</indexMin>
+        <indexMax>7</indexMax>
+        <volume deviceCategory="DEVICE_CATEGORY_HEADSET" ref="DEFAULT_DEVICE_CATEGORY_HEADSET_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER" ref="DEFAULT_DEVICE_CATEGORY_SPEAKER_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE" ref="DEFAULT_DEVICE_CATEGORY_EARPIECE_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA" ref="DEFAULT_DEVICE_CATEGORY_EXT_MEDIA_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID" ref="DEFAULT_HEARING_AID_VOLUME_CURVE"/>
+    </volumeGroup>
+
+    <volumeGroup>
+        <stream>AUDIO_STREAM_MUSIC</stream>
+        <indexMin>0</indexMin>
+        <indexMax>25</indexMax>
+        <volume deviceCategory="DEVICE_CATEGORY_HEADSET" ref="DEFAULT_MEDIA_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER" ref="DEFAULT_DEVICE_CATEGORY_SPEAKER_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE" ref="DEFAULT_MEDIA_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA" ref="DEFAULT_MEDIA_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID"  ref="DEFAULT_HEARING_AID_VOLUME_CURVE"/>
+    </volumeGroup>
+
+    <volumeGroup>
+        <stream>AUDIO_STREAM_ALARM</stream>
+        <indexMin>1</indexMin>
+        <indexMax>7</indexMax>
+        <volume deviceCategory="DEVICE_CATEGORY_HEADSET" ref="DEFAULT_NON_MUTABLE_HEADSET_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER" ref="DEFAULT_NON_MUTABLE_SPEAKER_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE" ref="DEFAULT_NON_MUTABLE_EARPIECE_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA" ref="DEFAULT_NON_MUTABLE_EXT_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID" ref="DEFAULT_NON_MUTABLE_HEARING_AID_VOLUME_CURVE"/>
+    </volumeGroup>
+
+    <volumeGroup>
+        <stream>AUDIO_STREAM_NOTIFICATION</stream>
+        <indexMin>0</indexMin>
+        <indexMax>7</indexMax>
+        <volume deviceCategory="DEVICE_CATEGORY_HEADSET" ref="DEFAULT_DEVICE_CATEGORY_HEADSET_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER" ref="DEFAULT_DEVICE_CATEGORY_SPEAKER_SYSTEM_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE" ref="DEFAULT_DEVICE_CATEGORY_EARPIECE_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA" ref="DEFAULT_DEVICE_CATEGORY_EXT_MEDIA_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID" ref="DEFAULT_DEVICE_CATEGORY_HEADSET_VOLUME_CURVE"/>
+    </volumeGroup>
+
+    <volumeGroup>
+        <stream>AUDIO_STREAM_BLUETOOTH_SCO</stream>
+        <indexMin>0</indexMin>
+        <indexMax>15</indexMax>
+        <volume deviceCategory="DEVICE_CATEGORY_HEADSET">
+            <point>0,-4200</point>
+            <point>33,-2800</point>
+            <point>66,-1400</point>
+            <point>100,0</point>
+        </volume>
+        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER">
+            <point>0,-2400</point>
+            <point>33,-1600</point>
+            <point>66,-800</point>
+            <point>100,0</point>
+        </volume>
+        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE">
+            <point>0,-4200</point>
+            <point>33,-2800</point>
+            <point>66,-1400</point>
+            <point>100,0</point>
+        </volume>
+        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA" ref="DEFAULT_MEDIA_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID" ref="DEFAULT_HEARING_AID_VOLUME_CURVE"/>
+    </volumeGroup>
+
+    <volumeGroup>
+        <stream>AUDIO_STREAM_ENFORCED_AUDIBLE</stream>
+        <indexMin>0</indexMin>
+        <indexMax>7</indexMax>
+        <volume deviceCategory="DEVICE_CATEGORY_HEADSET">
+            <point>1,-3000</point>
+            <point>33,-2600</point>
+            <point>66,-2200</point>
+            <point>100,-1800</point>
+        </volume>
+        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER">
+            <point>1,-3400</point>
+            <point>71,-2400</point>
+            <point>100,-2000</point>
+        </volume>
+        <!--volume deviceCategory="DEVICE_CATEGORY_SPEAKER" ref="DEFAULT_SYSTEM_VOLUME_CURVE"/-->
+        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE" ref="DEFAULT_SYSTEM_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA" ref="DEFAULT_DEVICE_CATEGORY_EXT_MEDIA_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID" ref="DEFAULT_HEARING_AID_VOLUME_CURVE"/>
+    </volumeGroup>
+
+    <volumeGroup>
+        <stream>AUDIO_STREAM_DTMF</stream>
+        <indexMin>0</indexMin>
+        <indexMax>15</indexMax>
+        <volume deviceCategory="DEVICE_CATEGORY_HEADSET">
+            <point>1,-3000</point>
+            <point>33,-2600</point>
+            <point>66,-2200</point>
+            <point>100,-1800</point>
+        </volume>
+        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER">
+            <point>1,-4000</point>
+            <point>71,-2400</point>
+            <point>100,-1400</point>
+        </volume>
+        <!--volume deviceCategory="DEVICE_CATEGORY_SPEAKER" ref="DEFAULT_SYSTEM_VOLUME_CURVE"/-->
+        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE" ref="DEFAULT_SYSTEM_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA" ref="DEFAULT_DEVICE_CATEGORY_EXT_MEDIA_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID" ref="DEFAULT_HEARING_AID_VOLUME_CURVE"/>
+    </volumeGroup>
+
+    <volumeGroup>
+        <stream>AUDIO_STREAM_TTS</stream>
+        <indexMin>0</indexMin>
+        <indexMax>15</indexMax>
+        <volume deviceCategory="DEVICE_CATEGORY_HEADSET" ref="SILENT_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER" ref="FULL_SCALE_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE" ref="SILENT_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA" ref="SILENT_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID" ref="SILENT_VOLUME_CURVE"/>
+    </volumeGroup>
+
+    <volumeGroup>
+        <stream>AUDIO_STREAM_ACCESSIBILITY</stream>
+        <indexMin>1</indexMin>
+        <indexMax>15</indexMax>
+        <volume deviceCategory="DEVICE_CATEGORY_HEADSET" ref="DEFAULT_NON_MUTABLE_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER" ref="DEFAULT_NON_MUTABLE_SPEAKER_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE" ref="DEFAULT_NON_MUTABLE_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA" ref="DEFAULT_NON_MUTABLE_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID" ref="DEFAULT_NON_MUTABLE_HEARING_AID_VOLUME_CURVE"/>
+    </volumeGroup>
+
+    <volumeGroup>
+        <stream>AUDIO_STREAM_REROUTING</stream>
+        <indexMin>0</indexMin>
+        <indexMax>1</indexMax>
+        <volume deviceCategory="DEVICE_CATEGORY_HEADSET" ref="FULL_SCALE_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER" ref="FULL_SCALE_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE" ref="FULL_SCALE_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA" ref="FULL_SCALE_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID" ref="FULL_SCALE_VOLUME_CURVE"/>
+    </volumeGroup>
+
+    <volumeGroup>
+        <stream>AUDIO_STREAM_PATCH</stream>
+        <indexMin>0</indexMin>
+        <indexMax>1</indexMax>
+        <volume deviceCategory="DEVICE_CATEGORY_HEADSET" ref="FULL_SCALE_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_SPEAKER" ref="FULL_SCALE_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EARPIECE" ref="FULL_SCALE_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_EXT_MEDIA" ref="FULL_SCALE_VOLUME_CURVE"/>
+        <volume deviceCategory="DEVICE_CATEGORY_HEARING_AID" ref="FULL_SCALE_VOLUME_CURVE"/>
+    </volumeGroup>
+</volumeGroups>
+
diff --git a/services/audiopolicy/enginedefault/src/Engine.cpp b/services/audiopolicy/enginedefault/src/Engine.cpp
index 43023a8..fd6a013 100644
--- a/services/audiopolicy/enginedefault/src/Engine.cpp
+++ b/services/audiopolicy/enginedefault/src/Engine.cpp
@@ -66,35 +66,6 @@
     }
 }
 
-status_t Engine::setPhoneState(audio_mode_t state)
-{
-    ALOGV("setPhoneState() state %d", state);
-
-    if (state < 0 || state >= AUDIO_MODE_CNT) {
-        ALOGW("setPhoneState() invalid state %d", state);
-        return BAD_VALUE;
-    }
-
-    if (state == getPhoneState()) {
-        ALOGW("setPhoneState() setting same state %d", state);
-        return BAD_VALUE;
-    }
-
-    // store previous phone state for management of sonification strategy below
-    int oldState = getPhoneState();
-    EngineBase::setPhoneState(state);
-
-    if (!is_state_in_call(oldState) && is_state_in_call(state)) {
-        ALOGV("  Entering call in setPhoneState()");
-        getApmObserver()->getVolumeCurves().switchVolumeCurve(AUDIO_STREAM_VOICE_CALL,
-                                                          AUDIO_STREAM_DTMF);
-    } else if (is_state_in_call(oldState) && !is_state_in_call(state)) {
-        ALOGV("  Exiting call in setPhoneState()");
-        getApmObserver()->getVolumeCurves().restoreOriginVolumeCurve(AUDIO_STREAM_DTMF);
-    }
-    return NO_ERROR;
-}
-
 status_t Engine::setForceUse(audio_policy_force_use_t usage, audio_policy_forced_cfg_t config)
 {
     switch(usage) {
diff --git a/services/audiopolicy/enginedefault/src/Engine.h b/services/audiopolicy/enginedefault/src/Engine.h
index 15fc358..d8a3698 100644
--- a/services/audiopolicy/enginedefault/src/Engine.h
+++ b/services/audiopolicy/enginedefault/src/Engine.h
@@ -55,8 +55,6 @@
     ///
     /// from EngineBase, so from AudioPolicyManagerInterface
     ///
-    status_t setPhoneState(audio_mode_t mode) override;
-
     status_t setForceUse(audio_policy_force_use_t usage,
                          audio_policy_forced_cfg_t config) override;
 
diff --git a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
index 5b752ea..b563a04 100644
--- a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
+++ b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
@@ -1710,7 +1710,7 @@
 
         // apply volume rules for current stream and device if necessary
         checkAndSetVolume(stream,
-                          mVolumeCurves->getVolumeIndex(stream, outputDesc->devices().types()),
+                          getVolumeCurves(stream).getVolumeIndex(outputDesc->devices().types()),
                           outputDesc,
                           outputDesc->devices().types());
 
@@ -2382,14 +2382,15 @@
         ALOGE("%s for stream %d: invalid min %d or max %d", __func__, stream , indexMin, indexMax);
         return;
     }
-    mVolumeCurves->initStreamVolume(stream, indexMin, indexMax);
+    // @todo: our proposal now use XML to store Indexes Min & Max
+    getVolumeCurves(stream).initVolume(indexMin, indexMax);
 
     // initialize other private stream volumes which follow this one
     for (int curStream = 0; curStream < AUDIO_STREAM_FOR_POLICY_CNT; curStream++) {
         if (!streamsMatchForvolume(stream, (audio_stream_type_t)curStream)) {
             continue;
         }
-        mVolumeCurves->initStreamVolume((audio_stream_type_t)curStream, indexMin, indexMax);
+        getVolumeCurves((audio_stream_type_t)curStream).initVolume(indexMin, indexMax);
     }
 }
 
@@ -2397,13 +2398,13 @@
                                                   int index,
                                                   audio_devices_t device)
 {
-
+    auto &curves = getVolumeCurves(stream);
     // VOICE_CALL and BLUETOOTH_SCO stream have minVolumeIndex > 0 but
     // can be muted directly by an app that has MODIFY_PHONE_STATE permission.
-    if (((index < mVolumeCurves->getVolumeIndexMin(stream)) &&
+    if (((index < curves.getVolumeIndexMin()) &&
             !((stream == AUDIO_STREAM_VOICE_CALL || stream == AUDIO_STREAM_BLUETOOTH_SCO) &&
             index == 0)) ||
-            (index > mVolumeCurves->getVolumeIndexMax(stream))) {
+            (index > curves.getVolumeIndexMax())) {
         return BAD_VALUE;
     }
     if (!audio_is_output_device(device)) {
@@ -2411,7 +2412,7 @@
     }
 
     // Force max volume if stream cannot be muted
-    if (!mVolumeCurves->canBeMuted(stream)) index = mVolumeCurves->getVolumeIndexMax(stream);
+    if (!curves.canBeMuted()) index = curves.getVolumeIndexMax();
 
     ALOGV("setStreamVolumeIndex() stream %d, device %08x, index %d",
           stream, device, index);
@@ -2421,7 +2422,8 @@
         if (!streamsMatchForvolume(stream, (audio_stream_type_t)curStream)) {
             continue;
         }
-        mVolumeCurves->addCurrentVolumeIndex((audio_stream_type_t)curStream, device, index);
+        auto &curCurves = getVolumeCurves(static_cast<audio_stream_type_t>(curStream));
+        curCurves.addCurrentVolumeIndex(device, index);
     }
 
     // update volume on all outputs and streams matching the following:
@@ -2455,8 +2457,7 @@
                 curStreamDevice |= device;
                 applyVolume = (Volume::getDeviceForVolume(curDevice) & curStreamDevice) != 0;
             } else {
-                applyVolume = !mVolumeCurves->hasVolumeIndexForDevice(
-                        stream, curStreamDevice);
+                applyVolume = !curves.hasVolumeIndexForDevice(curStreamDevice);
             }
             // rescale index before applying to curStream as ranges may be different for
             // stream and curStream
@@ -2465,9 +2466,10 @@
                 //FIXME: workaround for truncated touch sounds
                 // delayed volume change for system stream to be removed when the problem is
                 // handled by system UI
-                status_t volStatus =
-                        checkAndSetVolume((audio_stream_type_t)curStream, idx, desc, curDevice,
-                            (stream == AUDIO_STREAM_SYSTEM) ? TOUCH_SOUND_FIXED_DELAY_MS : 0);
+                status_t volStatus = checkAndSetVolume(
+                            (audio_stream_type_t)curStream, idx, desc, curDevice,
+                            (stream == AUDIO_STREAM_SYSTEM) ?
+                                TOUCH_SOUND_FIXED_DELAY_MS : 0);
                 if (volStatus != NO_ERROR) {
                     status = volStatus;
                 }
@@ -2494,7 +2496,7 @@
     }
     device = Volume::getDeviceForVolume(device);
 
-    *index =  mVolumeCurves->getVolumeIndex(stream, device);
+    *index =  getVolumeCurves(stream).getVolumeIndex(device);
     ALOGV("getStreamVolumeIndex() stream %d device %08x index %d", stream, device, *index);
     return NO_ERROR;
 }
@@ -2927,7 +2929,6 @@
     mHwModulesAll.dump(dst);
     mOutputs.dump(dst);
     mInputs.dump(dst);
-    mVolumeCurves->dump(dst);
     mEffects.dump(dst);
     mAudioPatches.dump(dst);
     mPolicyMixes.dump(dst);
@@ -4114,9 +4115,7 @@
     mpClientInterface(clientInterface),
     mLimitRingtoneVolume(false), mLastVoiceVolume(-1.0f),
     mA2dpSuspended(false),
-    mVolumeCurves(new VolumeCurvesCollection()),
-    mConfig(mHwModulesAll, mAvailableOutputDevices, mAvailableInputDevices,
-            mDefaultOutputDevice, static_cast<VolumeCurvesCollection*>(mVolumeCurves.get())),
+    mConfig(mHwModulesAll, mAvailableOutputDevices, mAvailableInputDevices, mDefaultOutputDevice),
     mAudioPortGeneration(1),
     mBeaconMuteRefCount(0),
     mBeaconPlayingRefCount(0),
@@ -4150,8 +4149,6 @@
 }
 
 status_t AudioPolicyManager::initialize() {
-    mVolumeCurves->initializeVolumeCurves(getConfig().isSpeakerDrcEnabled());
-
     // Once policy config has been parsed, retrieve an instance of the engine and initialize it.
     audio_policy::EngineInstance *engineInstance = audio_policy::EngineInstance::getInstance();
     if (!engineInstance) {
@@ -5532,7 +5529,8 @@
                                         int index,
                                         audio_devices_t device)
 {
-    float volumeDB = mVolumeCurves->volIndexToDb(stream, Volume::getDeviceCategory(device), index);
+    auto &curves = getVolumeCurves(stream);
+    float volumeDB = curves.volIndexToDb(Volume::getDeviceCategory(device), index);
 
     // handle the case of accessibility active while a ringtone is playing: if the ringtone is much
     // louder than the accessibility prompt, the prompt cannot be heard, thus masking the touch
@@ -5557,8 +5555,7 @@
         case AUDIO_STREAM_ENFORCED_AUDIBLE:
         case AUDIO_STREAM_DTMF:
         case AUDIO_STREAM_ACCESSIBILITY: {
-            int voiceVolumeIndex =
-                mVolumeCurves->getVolumeIndex(AUDIO_STREAM_VOICE_CALL, device);
+            int voiceVolumeIndex = getVolumeCurves(AUDIO_STREAM_VOICE_CALL).getVolumeIndex(device);
             const float maxVoiceVolDb =
                 computeVolume(AUDIO_STREAM_VOICE_CALL, voiceVolumeIndex, device)
                 + IN_CALL_EARPIECE_HEADROOM_DB;
@@ -5592,7 +5589,7 @@
                 || ((stream == AUDIO_STREAM_ENFORCED_AUDIBLE) &&
                     (mEngine->getForceUse(AUDIO_POLICY_FORCE_FOR_SYSTEM) ==
                      AUDIO_POLICY_FORCE_NONE))) &&
-            mVolumeCurves->canBeMuted(stream)) {
+            getVolumeCurves(stream).canBeMuted()) {
         // when the phone is ringing we must consider that music could have been paused just before
         // by the music application and behave as if music was active if the last music track was
         // just stopped
@@ -5603,9 +5600,8 @@
                     mEngine->getOutputDevicesForAttributes(attributes_initializer(AUDIO_USAGE_MEDIA),
                                                            nullptr, true /*fromCache*/).types();
             float musicVolDB = computeVolume(AUDIO_STREAM_MUSIC,
-                                             mVolumeCurves->getVolumeIndex(AUDIO_STREAM_MUSIC,
-                                                                              musicDevice),
-                                             musicDevice);
+                                   getVolumeCurves(AUDIO_STREAM_MUSIC).getVolumeIndex(musicDevice),
+                                   musicDevice);
             float minVolDB = (musicVolDB > SONIFICATION_HEADSET_VOLUME_MIN_DB) ?
                     musicVolDB : SONIFICATION_HEADSET_VOLUME_MIN_DB;
             if (volumeDB > minVolDB) {
@@ -5640,10 +5636,12 @@
     if (srcStream == dstStream) {
         return srcIndex;
     }
-    float minSrc = (float)mVolumeCurves->getVolumeIndexMin(srcStream);
-    float maxSrc = (float)mVolumeCurves->getVolumeIndexMax(srcStream);
-    float minDst = (float)mVolumeCurves->getVolumeIndexMin(dstStream);
-    float maxDst = (float)mVolumeCurves->getVolumeIndexMax(dstStream);
+    auto &srcCurves = getVolumeCurves(srcStream);
+    auto &dstCurves = getVolumeCurves(dstStream);
+    float minSrc = (float)srcCurves.getVolumeIndexMin();
+    float maxSrc = (float)srcCurves.getVolumeIndexMax();
+    float minDst = (float)dstCurves.getVolumeIndexMin();
+    float maxDst = (float)dstCurves.getVolumeIndexMax();
 
     // preserve mute request or correct range
     if (srcIndex < minSrc) {
@@ -5658,11 +5656,11 @@
 }
 
 status_t AudioPolicyManager::checkAndSetVolume(audio_stream_type_t stream,
-                                                   int index,
-                                                   const sp<AudioOutputDescriptor>& outputDesc,
-                                                   audio_devices_t device,
-                                                   int delayMs,
-                                                   bool force)
+                                               int index,
+                                               const sp<AudioOutputDescriptor>& outputDesc,
+                                               audio_devices_t device,
+                                               int delayMs,
+                                               bool force)
 {
     // do not change actual stream volume if the stream is muted
     if (outputDesc->isMuted(streamToVolumeSource(stream))) {
@@ -5698,7 +5696,7 @@
         float voiceVolume;
         // Force voice volume to max for bluetooth SCO as volume is managed by the headset
         if (stream == AUDIO_STREAM_VOICE_CALL) {
-            voiceVolume = (float)index/(float)mVolumeCurves->getVolumeIndexMax(stream);
+            voiceVolume = (float)index/(float)getVolumeCurves(stream).getVolumeIndexMax();
         } else {
             voiceVolume = 1.0;
         }
@@ -5721,7 +5719,7 @@
 
     for (int stream = 0; stream < AUDIO_STREAM_FOR_POLICY_CNT; stream++) {
         checkAndSetVolume((audio_stream_type_t)stream,
-                          mVolumeCurves->getVolumeIndex((audio_stream_type_t)stream, device),
+                          getVolumeCurves((audio_stream_type_t)stream).getVolumeIndex(device),
                           outputDesc,
                           device,
                           delayMs,
@@ -5754,10 +5752,10 @@
 
     ALOGVV("setStreamMute() stream %d, mute %d, mMuteCount %d device %04x",
           stream, on, outputDesc->getMuteCount(stream), device);
-
+    auto &curves = getVolumeCurves(stream);
     if (on) {
         if (!outputDesc->isMuted(streamToVolumeSource(stream))) {
-            if (mVolumeCurves->canBeMuted(stream) &&
+            if (curves.canBeMuted() &&
                     ((stream != AUDIO_STREAM_ENFORCED_AUDIBLE) ||
                      (mEngine->getForceUse(AUDIO_POLICY_FORCE_FOR_SYSTEM) == AUDIO_POLICY_FORCE_NONE))) {
                 checkAndSetVolume(stream, 0, outputDesc, device, delayMs);
@@ -5772,7 +5770,7 @@
         }
         if (outputDesc->decMuteCount(streamToVolumeSource(stream)) == 0) {
             checkAndSetVolume(stream,
-                              mVolumeCurves->getVolumeIndex(stream, device),
+                              curves.getVolumeIndex(device),
                               outputDesc,
                               device,
                               delayMs);
diff --git a/services/audiopolicy/managerdefault/AudioPolicyManager.h b/services/audiopolicy/managerdefault/AudioPolicyManager.h
index 70ad6ac..06a1f3e 100644
--- a/services/audiopolicy/managerdefault/AudioPolicyManager.h
+++ b/services/audiopolicy/managerdefault/AudioPolicyManager.h
@@ -49,7 +49,7 @@
 #include <AudioPolicyMix.h>
 #include <EffectDescriptor.h>
 #include <SoundTriggerSession.h>
-#include <VolumeCurve.h>
+#include "TypeConverter.h"
 
 namespace android {
 
@@ -310,12 +310,24 @@
         {
             return mAvailableInputDevices;
         }
-        virtual IVolumeCurvesCollection &getVolumeCurves() { return *mVolumeCurves; }
         virtual const sp<DeviceDescriptor> &getDefaultOutputDevice() const
         {
             return mDefaultOutputDevice;
         }
 
+        IVolumeCurves &getVolumeCurves(const audio_attributes_t &attr)
+        {
+            auto *curves = mEngine->getVolumeCurvesForAttributes(attr);
+            ALOG_ASSERT(curves != nullptr, "No curves for attributes %s", toString(attr).c_str());
+            return *curves;
+        }
+        IVolumeCurves &getVolumeCurves(audio_stream_type_t stream)
+        {
+            auto *curves = mEngine->getVolumeCurvesForStreamType(stream);
+            ALOG_ASSERT(curves != nullptr, "No curves for stream %s", toString(stream).c_str());
+            return *curves;
+        }
+
         void addOutput(audio_io_handle_t output, const sp<SwAudioOutputDescriptor>& outputDesc);
         void removeOutput(audio_io_handle_t output);
         void addInput(audio_io_handle_t input, const sp<AudioInputDescriptor>& inputDesc);
@@ -624,12 +636,12 @@
         float   mLastVoiceVolume;            // last voice volume value sent to audio HAL
         bool    mA2dpSuspended;  // true if A2DP output is suspended
 
-        std::unique_ptr<IVolumeCurvesCollection> mVolumeCurves; // Volume Curves per use case and device category
         EffectDescriptorCollection mEffects;  // list of registered audio effects
         sp<DeviceDescriptor> mDefaultOutputDevice; // output device selected by default at boot time
         HwModuleCollection mHwModules; // contains only modules that have been loaded successfully
         HwModuleCollection mHwModulesAll; // normally not needed, used during construction and for
                                           // dumps
+
         AudioPolicyConfig mConfig;
 
         std::atomic<uint32_t> mAudioPortGeneration;