ambient noise

noise.cfg

duration='00:59:00'
noisetype='pinknoise'
progress='--no-show-progress'

noisetype="pinknoise"
band_center="1000"
band_width="499"

tremolo_speed="0.01"
tremolo_depth="43"

reverb="19"

bass="-11"
treble="-1"
vol="14dB"

noise.sh

#!/bin/bash

set -u
set -e

# Load the default values from the config file
CONFIG="${HOME}/.config/noise.cfg"
if [[ -f ${CONFIG} ]]; then
  source ${CONFIG}
fi

# Use any values specified via the command line
while [[ $# > 0 ]];
do
  case $1 in
    -c|--config)
      if [[ ! -f $2 ]]; then
        echo "ERROR: ${2} is not a file"
        exit 1
      fi
      source ${2}
      shift
      ;;
    -d|--duration)
      duration=$2
      shift
      ;;
    -p|--progress)
      progress='--show-progress'
      ;;
    -t|--type)
      case $2 in
        'white'|'pink'|'brown'|'tpdf')
          noisetype=${2}noise
          shift
          ;;
        *)
          echo "ERROR: unrecognized type of noise"
          exit 1
      esac
      ;;
    -v|--volume)
      vol=$2
      shift
      ;;
    *)
      echo "ERROR: unrecognized option"
      exit 1
  esac
  shift
done

if [[ -z ${duration} ]]; then
  echo "ERROR: you need to provide a duration"
  exit 1
fi

if [[ -z ${noisetype} ]]; then
  echo "ERROR: you need to proivde a noise type"
  exit 1
fi

play ${progress} --null --channels 2 \
  synth ${duration} ${noisetype} \
  band -n ${band_center} ${band_width} \
  tremolo ${tremolo_speed} ${tremolo_depth} \
  reverb ${reverb} \
  bass ${bass} \
  treble ${treble} \
  vol ${vol}