#!/bin/env bash

################################################################################

SOURCE_HOST="127.0.0.1:8000"

################################################################################

main() {
  if [[ $# -lt 2 ]] ; then
    usage
    exit 0
  fi

  transcode "$1" "$2" "${3:-192k}"
}

transcode() {
  local source_name="$1"
  local password="$2"
  local bitrate="$3"
  local bitrate_num=$(echo "$bitrate" | tr -d "k")

  local stream="http://$SOURCE_HOST/${source_name}"

  while : ; do
    ffmpeg -icy 1 \
           -i "${stream}" \
           -vn -map_metadata:s:0 0:g \
           -acodec libfdk_aac \
           -b:a "$bitrate" \
           "icecast://source:${password}@${SOURCE_HOST}/${bitrate_num}.aac"

    checkStatus "$source"
  done
}

checkStatus() {
  local status

  echo "Stream is down, waiting…"

  while : ; do
    status=$(curl -Is -o /dev/null -w "%{http_code}" "$1")

    if [[ "$status" == "200" ]] ; then
      echo "Stream is up, resume transcoding…"
      return
    fi

    sleep 1
  done
}

usage() {
  echo "nohup ./transcoder.sh {source-name} {password} {bitrate} &"
}

################################################################################

main "$@"