<?xml version="1.0" encoding="UTF
-8" standalone="yes"?>
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--
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<audioPolicyConfiguration version="7.0" xmlns
:xi="http
://www.w3.org/2001/XInclude">
<!
-- version section contains a “version” tag in
the form “major.minor” e.g version=”1.0”
-->
<!
-- Global configuration Decalaration
-->
<globalConfiguration speaker_drc_enabled="true" c
all_screen_mode_supported="true"/>
<!
-- Modules section
:
There is one section per audio HW module present on
the plat
form.
Each module section will contains two mandatory tags
for audio HAL “halVersion” and “name”.
The module names are
the same as in current .conf file
:
“primary”, “A2DP”, “remote_submix”, “USB”
Each module will contain
the following sections
:
“devicePorts”
: a list
of device descriptors
for all input and output devices accessible via this
module.
This contains both permanently attached devices and removable devices.
“mixPorts”
: listing
all output and
input streams exposed by
the audio HAL
“routes”
: list
of possible connections between
input and output devices or between stream and
devices.
"route"
: is defined by an attribute
:
-"type"
: <mux|mix> means
all sources are mutual exclusive
(mux
) or can be mixed
(mix
)
-"sink"
: the sink involved in this route
-"sources"
: all the sources than can be connected to
the sink via vis route
“attachedDevices”
: permanently attached devices.
The attachedDevices section is a list
of devices names.
The names correspond to device names
defined in <devicePorts> section.
“defaultOutputDevice”
: device to be used by default when no policy rule applies
-->
<modules>
<!
-- Primary Audio HAL is now hosted in audio_module_config_primary
-->
<!
-- A2DP Audio HAL
-->
<!
-- <module name="a2dp" halVersion="2.0">
<mixPorts>
<mixPort name="a2dp
input" role="sink">
<pr
ofile name=""
format="AUDIO_
FORMAT_PCM_16_BIT"
samplingRates="44100 48000" channelMasks="AUDIO_CHANNEL_IN_MONO AUDIO_CHANNEL_IN_STEREO"/>
</mixPort>
</mixPorts>
<devicePorts>
<devicePort tagName="BT A2DP In" type="AUDIO_DEVICE_IN_BLUETOOTH_A2DP" role="source">
<pr
ofile name=""
format="AUDIO_
FORMAT_PCM_16_BIT"
samplingRates="44100 48000" channelMasks="AUDIO_CHANNEL_IN_MONO AUDIO_CHANNEL_IN_STEREO"/>
</devicePort>
</devicePorts>
<routes>
<route type="mix" sink="a2dp
input"
sources="BT A2DP In"/>
</routes>
</module>
-->
<!
-- Usb Audio HAL
-->
<module name="usb" halVersion="2.0">
<mixPorts>
<mixPort name="usb_accessory output" role="source">
<pr
ofile name=""
format="AUDIO_
FORMAT_PCM_16_BIT"
samplingRates="44100" channelMasks="AUDIO_CHANNEL_OUT_STEREO"/>
</mixPort>
</mixPorts>
<devicePorts>
<devicePort tagName="USB Host Out" type="AUDIO_DEVICE_OUT_USB_ACCESSORY" role="sink">
<pr
ofile name=""
format="AUDIO_
FORMAT_PCM_16_BIT"
samplingRates="44100" channelMasks="AUDIO_CHANNEL_OUT_STEREO"/>
</devicePort>
</devicePorts>
<routes>
<route type="mix" sink="USB Host Out"
sources="usb_accessory output"/>
</routes>
</module>
<!
-- #ifdef OPLUS_FEATURE_VIRTUAL_AUDIO
-->
<!
-- ZhangHui@MULTIMEDIA.AUDIOSERVER.BASE, 2021/10/11, Add
for virtual audio
-->
<xi
:include href="/odm/etc/virtual_audio_policy_configuration.xml">
<xi
:f
allback></xi
:f
allback>
</xi
:include>
<!
-- #endif OPLUS_FEATURE_VIRTUAL_AUDIO
-->
<!
-- Remote Submix Audio HAL
-->
<xi
:include href="/vendor/etc/r_submix_audio_policy_configuration.xml"/>
<!
-- Bluetooth Audio HAL
for hearing aid
-->
<xi
:include href="/vendor/etc/bluetooth_qti_hearing_aid_audio_policy_configuration.xml"/>
<!
-- Stub HAL
-->
<xi
:include href="/vendor/etc/stub_audio_policy_configuration.xml"/>
</modules>
<!
-- End
of Modules section
-->
<!
-- Volume section
-->
<xi
:include href="/vendor/etc/audio_policy_volumes.xml"/>
<xi
:include href="/vendor/etc/default_volume_tables.xml"/>
<!
-- End
of Volume section
-->
</audioPolicyConfiguration>
以上文件路径：/vendor/etc/audio/sku_sun_qssi/audio_policy_configuration.xml
一加13 Coloros15，安卓版本15，修改该文件，绕过安卓音频SRC实现系统全局自适应采样率（Dynamic sampling rates）、自适应位深（Bit_perfect）（保持音频文件原始位深，16bit文件不升级位深）、禁用升频和重采样，关闭所有音频音效（effect）以及影响音频质量无损输出的一切音频处理，最大程度上抑制并降低音频抖动（jitter）
(最大化优化时钟管理和同步
)、最大程度降低音频失真和噪声以及电源纹波和噪声，以输出和输入最干净无污染最高质量的HIFI无损原始音频信号直出，并且输出修改过的完整文件（不要片段）
一位老师为了让学生体验古典音乐的魅力，组织了一次音乐会之旅，并为学生们准备了柠檬水、蛋糕等小食。活动结束后，老师询问学生Sally是否喜欢这次活动，Sally表示除了音乐之外都很喜欢。
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