version 1 .

# If headset present:
#  - ringing: speaker & headset
#  - notification: speaker & headset
#  - non-speakerphone call: headset
#  - speakerphone call: speaker
#  - music: headset
#
# If headset absent:
#  - ringing: speaker
#  - notification: speaker
#  - non-speakerphone call: earpiece
#  - speakerphone call: speaker
#  - music: speaker
#
.

Mapping = <alsa-mapping @abstract Endpoint @concrete string> .
Endpoint = <source @value Source> / <sink @value Sink> .

Sink =
/ =speaker
/ =headset
/ =earpiece
.

Source =
/ =speakerphone
/ =headset
/ =handset
.

HeadsetSpeakerPresent = <headset-speaker-present> .
HeadsetMicrophonePresent = <headset-microphone-present> .