[NEW PORT] audio/libltc: Linear/Logitudinal Time Code (LTC) Library

[ultima]

Summary

Linear (or Longitudinal) Timecode (LTC) is an encoding of SMPTE timecode data
as a Manchester-Biphase encoded audio signal. The audio signal is commonly
recorded on a VTR track or other storage media.

libltc provides functionality to encode and decode LTC audio from/to SMPTE or
EBU timecode, including SMPTE date support.

WWW: https://github.com/x42/libltc

PR\: 221196
Submitted by\: Yuri Victorovich (maintainer)
Reviewed by\: lifanov (mentor), matthew (mentor)
Approved by\: lifanov (mentor), matthew (mentor)
Differential Revision\: https://reviews.freebsd.org/DXXXXX

Test Plan

portlint:
looks fine.

poudriere:
103i386
103amd64
110i386
110amd64
12i386
12amd64

[mat]

audio/libltc/Makefile

5

Note that according to 5.2.2. Versions, DISTVERSION or PORTVERSION, this should probably be using DISTVERSION.

[ultima]

Changed PORTVERSION to DISTVERSION as suggested

[matthew]