erfanoabdi / audiosystem-passthrough

audiosystem-passthrough

Configuration possibilites matrix

What is needed and when

Qualcomm chipsets

Android <= 8:

• for voice calls: AudioFlinger
• for media (camera etc): AudioFlinger (o)

Android >= 9:

• for voice calls: IQcRilAudio
• for media (camera etc): AudioFlinger (o)

Other chipsets

All? Android versions:

• for media (camera etc): AudioFlinger (o)

(o): Depends, that is, some devices might not need this but others do.

What can satisfy dependencies

AudioFlinger

For voice calls, one of

• combination of pulseaudio-modules-droid-glue and audioflingerglue
• combination of pulseaudio-modules-droid-hidl and audiosystem-passthrough

For media, one of

• audioflingerglue
• audiosystem-passthrough-dummy-af (from package audiosystem-passthrough)

If device needs AudioFlinger for both voice calls and media and a combination of pa-modules-droid-hidl and audiosystem-passthrough is used a single instance of audiosystem-passthrough running under pulseaudio-modules-droid-hidl is enough.

IQcRilAudio

For voice calls,

• combination of pulseaudio-modules-droid-hidl and audiosystem-passthrough

Helper for pulseaudio-modules-droid-hidl

When run from the droid-hidl module the module tries to autodetect correct configuration for the helper. If this is not the case you can modify PulseAudio sysconfig file (/etc/sysconfig/pulseaudio) and add following environment variables:

AUDIOSYSTEM_PASSTHROUGH_TYPE={qti,af}
AUDIOSYSTEM_PASSTHROUGH_IDX={17,18} # only applicable to af type

Type qti is for devices which have qti HIDL interface IQcRilAudio.

Standalone dummy mode

Package audiosystem-passthrough-dummy-af contain service file which starts audiosystem-passthrough in AudioFlinger dummy mode. This can be used on devices where AudioFlinger service needs to be present but isn't used for anything.