Audio: Add XML schema for audio effects configuration

<?xml version="1.0" encoding="utf-8"?>

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     Licensed under the Apache License, Version 2.0 (the "License");

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<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"

           targetNamespace="http://schemas.android.com/audio/audio_effects_conf/v2_0"

           xmlns:aec="http://schemas.android.com/audio/audio_effects_conf/v2_0"

           elementFormDefault="qualified">

  <!-- Simple types -->

  <xs:simpleType name="versionType">

    <xs:restriction base="xs:decimal">

      <xs:enumeration value="2.0"/>

    </xs:restriction>

  </xs:simpleType>

  <xs:simpleType name="uuidType">

    <xs:restriction base="xs:string">

      <xs:pattern value="[0-9A-Fa-f]{8}-[0-9A-Fa-f]{4}-[0-9A-Fa-f]{4}-[0-9A-Fa-f]{4}-[0-9A-Fa-f]{12}"/>

    </xs:restriction>

  </xs:simpleType>

  <xs:simpleType name="streamInputType">

    <xs:restriction base="xs:string">

      <xs:enumeration value="mic"/>

      <xs:enumeration value="voice_uplink"/>

      <xs:enumeration value="voice_downlink"/>

      <xs:enumeration value="voice_call"/>

      <xs:enumeration value="camcorder"/>

      <xs:enumeration value="voice_recognition"/>

      <xs:enumeration value="voice_communication"/>

      <xs:enumeration value="unprocessed"/>

    </xs:restriction>

  </xs:simpleType>

  <xs:simpleType name="streamOutputType">

    <xs:restriction base="xs:string">

      <xs:enumeration value="default"/>

      <xs:enumeration value="voice_call"/>

      <xs:enumeration value="system"/>

      <xs:enumeration value="ring"/>

      <xs:enumeration value="music"/>

      <xs:enumeration value="alarm"/>

      <xs:enumeration value="notification"/>

      <xs:enumeration value="bluetooth_sco"/>

      <xs:enumeration value="enforced_audible"/>

      <xs:enumeration value="dtmf"/>

      <xs:enumeration value="tts"/>

    </xs:restriction>

  </xs:simpleType>

  <!-- Complex types -->

  <xs:complexType name="libraryType">

    <xs:annotation>

      <xs:documentation xml:lang="en">

        List of effect libraries to load. Each library element must have "name" and

        "path" attributes. The latter is giving the full path of the library .so file.

        Example:

        <library name="name" path="/vendor/lib/soundfx/lib.so"/>

      </xs:documentation>

    </xs:annotation>

    <xs:sequence>

      <xs:element name="library" minOccurs="0" maxOccurs="unbounded">

        <xs:complexType>

          <xs:attribute name="name" type="xs:string" use="required"/>

          <xs:attribute name="path" type="xs:string" use="required"/>

        </xs:complexType>

      </xs:element>

    </xs:sequence>

  </xs:complexType>

  <xs:complexType name="effectImplType">

    <xs:attribute name="library" type="xs:string" use="required"/>

    <xs:attribute name="uuid" type="aec:uuidType" use="required"/>

  </xs:complexType>

  <xs:complexType name="effectProxyType">

    <xs:complexContent>

      <xs:extension base="aec:effectImplType">

        <xs:sequence>

          <xs:element name="libsw" type="aec:effectImplType" minOccurs="0" maxOccurs="1"/>

          <xs:element name="libhw" type="aec:effectImplType" minOccurs="0" maxOccurs="1"/>

        </xs:sequence>

        <xs:attribute name="name" type="xs:string" use="required"/>

      </xs:extension>

    </xs:complexContent>

  </xs:complexType>

  <xs:complexType name="effectType">

    <xs:annotation>

      <xs:documentation xml:lang="en">

        List of effects to load. Each effect element must contain "name",

        "library", and "uuid" attrs. The value of the "library" attr must

        correspond to the name of a "library" element. The name of the effect

        element is indicative, only the value of the "uuid" element designates

        the effect for the audio framework.  The uuid is the implementation

        specific UUID as specified by the effect vendor. This is not the generic

        effect type UUID.

        For effect proxy implementations, SW and HW implemetations of the effect

        can be specified.

        Example:

        <effect name="name" library="lib" uuid="uuuu"/>

        <effect name="proxied" library="proxy" uuid="xxxx">

            <libsw library="sw_bundle" uuid="yyyy"/>

            <libhw library="offload_bundle" uuid="zzzz"/>

        </effect>

      </xs:documentation>

    </xs:annotation>

    <xs:sequence>

      <xs:element name="effect" type="aec:effectProxyType" minOccurs="0" maxOccurs="unbounded"/>

    </xs:sequence>

  </xs:complexType>

  <xs:complexType name="streamProcessingType">

    <xs:sequence>

      <xs:element name="apply" minOccurs="0" maxOccurs="unbounded">

        <xs:complexType>

          <xs:attribute name="effect" type="xs:string" use="required"/>

        </xs:complexType>

      </xs:element>

    </xs:sequence>

  </xs:complexType>

  <xs:complexType name="streamPreprocessType">

    <xs:annotation>

      <xs:documentation xml:lang="en">

        Audio preprocessing configuration. The processing configuration consists

        of a list of elements each describing processing settings for a given

        input stream. Valid input stream types are listed in "streamInputType".

        Each stream element contains a list of "apply" elements. The value of the

        "effect" attr must correspond to the name of an "effect" element.

        Example:

        <stream type="voice_communication">

            <apply effect="effect1"/>

            <apply effect="effect2"/>

        </stream>

      </xs:documentation>

    </xs:annotation>

    <xs:complexContent>

      <xs:extension base="aec:streamProcessingType">

        <xs:attribute name="type" type="aec:streamInputType" use="required"/>

      </xs:extension>

    </xs:complexContent>

  </xs:complexType>

  <xs:complexType name="streamPostprocessType">

    <xs:annotation>

      <xs:documentation xml:lang="en">

        Audio postprocessing configuration. The processing configuration consists

        of a list of elements each describing processing settings for a given

        output stream. Valid output stream types are listed in "streamOutputType".

        Each stream element contains a list of "apply" elements. The value of the

        "effect" attr must correspond to the name of an "effect" element.

        Example:

        <stream type="music">

            <apply effect="effect1"/>

        </stream>

      </xs:documentation>

    </xs:annotation>

    <xs:complexContent>

      <xs:extension base="aec:streamProcessingType">

        <xs:attribute name="type" type="aec:streamOutputType" use="required"/>

      </xs:extension>

    </xs:complexContent>

  </xs:complexType>

  <!-- Root element -->

  <xs:element name="audio_effects_conf">

    <xs:complexType>

      <xs:sequence>

        <xs:element name="libraries" type="aec:libraryType"/>

        <xs:element name="effects" type="aec:effectType"/>

        <xs:element name="postprocess" minOccurs="0" maxOccurs="1">

          <xs:complexType>

            <xs:sequence>

              <xs:element name="stream" type="aec:streamPostprocessType" minOccurs="0" maxOccurs="unbounded"/>

            </xs:sequence>

          </xs:complexType>

        </xs:element>

        <xs:element name="preprocess" minOccurs="0" maxOccurs="1">

          <xs:complexType>

            <xs:sequence>

              <xs:element name="stream" type="aec:streamPreprocessType" minOccurs="0" maxOccurs="unbounded"/>

            </xs:sequence>

          </xs:complexType>

        </xs:element>

      </xs:sequence>

      <xs:attribute name="version" type="aec:versionType" use="required"/>

    </xs:complexType>

    <!-- Keys and references -->

    <xs:key name="libraryName">

      <xs:selector xpath="aec:libraries/aec:library"/>

      <xs:field xpath="@name"/>

    </xs:key>

    <xs:keyref name="libraryNameRef1" refer="aec:libraryName">

      <xs:selector xpath="aec:effects/aec:effect"/>

      <xs:field xpath="@library"/>

    </xs:keyref>

    <xs:keyref name="libraryNameRef2" refer="aec:libraryName">

      <xs:selector xpath="aec:effects/aec:effect/aec:libsw"/>

      <xs:field xpath="@library"/>

    </xs:keyref>

    <xs:keyref name="libraryNameRef3" refer="aec:libraryName">

      <xs:selector xpath="aec:effects/aec:effect/aec:libhw"/>

      <xs:field xpath="@library"/>

    </xs:keyref>

    <xs:key name="effectName">

      <xs:selector xpath="aec:effects/aec:effect"/>

      <xs:field xpath="@name"/>

    </xs:key>

    <xs:keyref name="effectNamePreRef" refer="aec:effectName">

      <xs:selector xpath="aec:preprocess/aec:stream/aec:apply"/>

      <xs:field xpath="@effect"/>

    </xs:keyref>

    <xs:keyref name="effectNamePostRef" refer="aec:effectName">

      <xs:selector xpath="aec:postprocess/aec:stream/aec:apply"/>

      <xs:field xpath="@effect"/>

    </xs:keyref>

  </xs:element>

</xs:schema>