For dolby media codecs to work, add this line in your media codecs xml (should be in vendor partition) :-
<Include href="media_codecs_dolby_audio.xml" />
Add the dolby effects in your device's audio_effects.xml :-
<!--DOLBY DAP-->
<library name="dap_sw" path="libswdap.so"/>
<library name="dap_hw" path="libhwdap.so"/>
<!--DOLBY END-->
<!--DOLBY GAME-->
<library name="gamedap" path="libswgamedap.so"/>
<!--DOLBY END-->
<!--DOLBY DAP-->
<effectProxy name="dap" library="proxy" uuid="9d4921da-8225-4f29-aefa-39537a04bcaa">
<libsw library="dap_sw" uuid="6ab06da4-c516-4611-8166-452799218539"/>
<libhw library="dap_hw" uuid="a0c30891-8246-4aef-b8ad-d53e26da0253"/>
</effectProxy>
<!--DOLBY END-->
<!--DOLBY VQE-->
<effect name="vqe" library="vqe" uuid="64a0f614-7fa4-48b8-b081-d59dc954616f"/>
<!--DOLBY END-->
Inherit the dolby makefile by adding this in your device's makefile (device.mk) :-
$(call inherit-product, hardware/dolby/dolby.mk)Add this line in your BoardConfig.mk in device tree :-
AUDIO_FEATURE_ENABLED_HW_ACCELERATED_EFFECTS := true
Remove these properties from vendor.prop in device tree :-
vendor.audio.dolby.ds2.enabled=false
vendor.audio.dolby.ds2.hardbypass=false
Add this hal in your device's hidl framework compatibility matrix xml :-
<hal format="hidl" optional="true">
<name>vendor.dolby.hardware.dms</name>
<version>2.0</version>
<interface>
<name>IDms</name>
<instance>default</instance>
</interface>
</hal>
Add this hal in your device's hidl manifest xml :-
<hal format="hidl">
<name>vendor.dolby.hardware.dms</name>
<transport>hwbinder</transport>
<fqname>@2.0::IDms/default</fqname>
</hal>
At the end an example commit to properly implement it in your device tree could be :-
Device Tree :- https://github.com/veux-frost-testzone/device_xiaomi_veux/commit/8b424b24eebdbad018266b662cffd159fcde5bed
Audio config :- https://github.com/veux-frost-testzone/hardware_qcom-caf_sm8350_audio_configs_holi/commit/8f34207706015b5bcf718ec2387831853f9b3d9c