audio.exploreapollo.org

Audio Processing Server for exploreapollo.org

Exposes an audio stream to be consumed by the client.

Dev Setup

1. Install Go:
   sudo add-apt-repository ppa:ubuntu-lxc/lxd-stable
   sudo apt-get update
   sudo apt-get install golang

2. Create Go workspace & clone repository
   mkdir $HOME/exploreapollo-audio
   export GOPATH=$HOME/work (this can be anywhere, maybe add this to ~/.bashrc)
   mkdir $GOPATH/src/github.com/UTD-CRSS
   cd $GOPATH/src/github.com/UTD-CRSS
   git clone https://github.com/UTD-CRSS/exploreapollo-audio
   mv exploreapollo-audio audio.exploreapollo.org
   cd audio.exploreapollo.org
   cp sample-config.json config.json

3. Install psql driver && compile project
   go get github.com/lib/pq
   go install github.com/UTD-CRSS/exploreapollo-audio/audio

to run server just: go run main.go

Parameters

Parameter	Domain	Description
mission	INT	Apollo mission of interest
channels	[]INT	Channels of interest (comma separated)
format	m4a, ogg	streaming format
start	INT64	Mission Elapsed Time, in milliseconds
duration	INT64	duration of desired audio beginning at time start, in milliseconds

Example Query Url

http://audio.exploreapollo.org/stream?mission=11&channels=14,18,24&start=369300000&duration=600000&format=m4a

returns an m4a stream of Apollo 11 channels 14, 18, and 24 starting at MET 369300000 (this is equivalent to MET 102:35:00) and lasting 600000 milliseconds (10 minutes).

Heroku deployment

The Heroku application is set to deploy the master branch. The branch must be manually deployed through the Heroku console to view new changes.

The server uses the following buildpacks, which must be installed via the Heroku console for deployment:

• https://github.com/heroku/heroku-buildpack-apt
• https://github.com/lespreludes/heroku-buildpack-ffmpeg-lame.git
• https://github.com/heroku/heroku-buildpack-go.git

The file Aptfile is used by heroku-buildpack-apt to obtain additional dependencies.