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gpac mabr gateway

This repository demonstrates usage of gpac's mediaserver filter to run an mabr gateway supporting dynamic unicast/multicast switching.

installation

android/termux

to run the gateway on android uing Termux, refer to: /cfg/termux/README.md

linux

on linux, assuming you have the latest gpac installed, install the mediaserver js scripts:

cp gateway/gpac.scripts.jsf.mediaserver/*.js /usr/local/share/gpac/scripts/jsf/mediaserver

configuration

For details on the gateway configuration, please refer to gpac's mediaserver filter documentation.

gateway configuration file - /gateway/termux/gateway.scfg:

[
  {
    "id": "service1",
    "local": "service1/Manifest.mpd",
    "timeshift": 30,
    "http": "https://live-linear.dvb.org/livesim2/tsbd_30/spd_4/utc_httpisoms/start_1735689600/1003_avc_hd_sdr_mpegh/manifest_livesim.mpd",
    "repair": true,
    "js": "dyn_mabr",
    "smartcd_api_endpoint": "http://192.168.1.180:3000/api",
    "smartcd_service_software_release_urn": "urn:1b54fdfa-55da-4896-9f53-028318ad51b5",
    "smartcd_service_computer_guid": "COMP-1"
  }
]

Properties starting with smartcd_api_ are not standard gpac options, but are specific to the gateway/gpac.scripts.jsf.mediaserver/dyn_mabr.js module that implements dynamic unicast/multicast switching.

Replace smartcd_api_endpoint with to point to the machine exposing the slapos orchestrator API:

    "smartcd_api_endpoint": "http://192.168.1.180:3000/api",

test environment

the scd-gateway-tools command is a lightweight nodejs app to conveniently test the unicast/multicast dynamic switching behaviour.

running the scd-gateway-tools command:

npm run scd-gateway-tools ./cfg/local/gateway.yml
  • exposes a page to monitor the gateway & play the services with dashjs
  • exposes an api to start/stop gpac as an mabr server for the configured services
  • exposes a mock of the slapos api to test the gateway in a dynamic unicast/multicast scenario
  • starts the gateway as a child process (optional)

the monitor default's default url is http://127.0.0.1:3000/

test bench configuration file - cfg/gateway.yml:

port for serving the monitoring page & mock orchestrator APIs:

port: 3000

the list of service definitions:

mcast:
  - service_id: "service1"
    http_origin: "https://live-linear.dvb.org/livesim2/tsbd_30/spd_4/utc_httpisoms/start_1735689600/1003_avc_hd_sdr_mpegh/manifest_livesim.mpd"
    mcast_output: "route://239.255.255.250:1234/:ifce=127.0.0.1"
    slapos_computer_guid: "COMP-1"
  • each service defines a unique service id and a unique http origin.
  • the value of slapos_computer_guid must match on the gateway configuration.

(optional) if a gateway configuration is specified, the tool will automaticaly start the gateway as a child process:

gateway:
  port: 8081
  scfg: /scd/gateway/cfg/docker/route.scfg

Docker

using docker is only supported on linux using the host network mode

gateway tools image

the scd-gateway-tools image builds on top of localhost/gpac:latest gpac base image:

docker build -t localhost/scd-gateway-tools -f gateway/Dockerfile .

the --network host is required, to allow usage of mabr servers or the mabr gateway:

docker run -v ./cfg:/scd/gateway/cfg --network host localhost/scd-gateway-tools:latest

gpac base image

amd64 linux host

docker pull gpac/ubuntu:latest

on amd64 is the official gpac ubuntu image is used

arm64 linux host

docker build -t localhost/gpac -f gateway/gpac.arm64.Dockerfile .

on arm64 a custom Dockerfile must be built