services/audiopolicy/config/default_volume_tables.xml

<?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_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>
</volumes>