Android里audio音頻的xml組態檔如何理解？

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>

<audioPolicyConfiguration version="1.0" xmlns:xi="http://www.w3.org/2001/XInclude">

    <globalConfiguration speaker_drc_enabled="true"/>

    <modules>

        <module name="primary" halVersion="3.0">

            <attachedDevices>

                <item>Speaker</item>

                <item>Earpiece</item>

                <item>Built-In Mic</item>

            </attachedDevices>

            <defaultOutputDevice>Speaker</defaultOutputDevice>

            <mixPorts>

                <mixPort name="primary output" role="source" flags="AUDIO_OUTPUT_FLAG_PRIMARY">

                    <profile name="" format="AUDIO_FORMAT_PCM_16_BIT"

                             samplingRates="48000" channelMasks="AUDIO_CHANNEL_OUT_STEREO"/>

                </mixPort>

                <mixPort name="primary input" role="sink">

                    <profile name="" format="AUDIO_FORMAT_PCM_16_BIT"

                             samplingRates="8000,16000,48000"

                             channelMasks="AUDIO_CHANNEL_IN_MONO"/>

                </mixPort>

            </mixPorts>

            <devicePorts>

                <devicePort tagName="Earpiece" type="AUDIO_DEVICE_OUT_EARPIECE" role="sink">

                   <profile name="" format="AUDIO_FORMAT_PCM_16_BIT"

                            samplingRates="48000" channelMasks="AUDIO_CHANNEL_IN_MONO"/>

                </devicePort>

                <devicePort tagName="Speaker" role="sink" type="AUDIO_DEVICE_OUT_SPEAKER" address="">

                    <profile name="" format="AUDIO_FORMAT_PCM_16_BIT"

                             samplingRates="48000" channelMasks="AUDIO_CHANNEL_OUT_STEREO"/>

                </devicePort>

                <devicePort tagName="Wired Headset" type="AUDIO_DEVICE_OUT_WIRED_HEADSET" role="sink">

                    <profile name="" format="AUDIO_FORMAT_PCM_16_BIT"

                             samplingRates="48000" channelMasks="AUDIO_CHANNEL_OUT_STEREO"/>

                </devicePort>

                <devicePort tagName="Built-In Mic" type="AUDIO_DEVICE_IN_BUILTIN_MIC" role="source">

                    <profile name="" format="AUDIO_FORMAT_PCM_16_BIT"

                             samplingRates="8000,16000,48000"

                             channelMasks="AUDIO_CHANNEL_IN_MONO"/>

                </devicePort>

                <devicePort tagName="Wired Headset Mic" type="AUDIO_DEVICE_IN_WIRED_HEADSET" role="source">

                    <profile name="" format="AUDIO_FORMAT_PCM_16_BIT"

                             samplingRates="8000,16000,48000"

                             channelMasks="AUDIO_CHANNEL_IN_MONO"/>

                </devicePort>

            </devicePorts>

            <routes>

                <route type="mix" sink="Earpiece" sources="primary output"/>

                <route type="mix" sink="Speaker" sources="primary output"/>

                <route type="mix" sink="Wired Headset" sources="primary output"/>

                <route type="mix" sink="primary input" sources="Built-In Mic,Wired Headset Mic"/>

            </routes>

        </module>

        <xi:include href="https://bbs.csdn.net/topics/a2dp_audio_policy_configuration.xml"/>

    </modules>



    <xi:include href="https://bbs.csdn.net/topics/audio_policy_volumes.xml"/>

    <xi:include href="https://bbs.csdn.net/topics/default_volume_tables.xml"/>

</audioPolicyConfiguration>

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