# !/bin/bash
# Randomly plays all albums in current directory, optionally restricting to albums added since a number of days
# Usage: play_albums [numdays]
#    numdays: max age of album (directory timestamp)
# Assumes albums are directories containing tracks
# requires mplayer and bash (un*x/cygwin)

if [ -z $1 ]; then
  # play regardless of age
  echo "Playing random albums from `pwd`"
else 
  # play if modified before $1 days
  FIND_ARGS="-mtime -$1"
  echo "Playing random albums from `pwd` added less than $1 days ago"
fi;

find -type d $FIND_ARGS > /tmp/albums
# uncomment to filter sound.  negative values are reduced volume, positive are increased
#VOLUME="-af volume=-20.0"

MPLAYER_ARGS=$VOLUME

# change to false to keep gaps (and not use aplay and fifo)
# gapless playback source: http://snipplr.com/view/18353/gapless-playback-for-mplayer-linux/
GAPLESS=true
if [ $GAPLESS ]; then
  USER=`id -un`
  FIFO=/tmp/aufifo.$USER
  MPLAYER_ARGS="$MPLAYER_ARGS -ao pcm:nowaveheader:file=$FIFO"
fi;

while [ true ]; do
  ALBUM=`cat /tmp/albums | sort -R  | head -n 1`
  echo "Playing Album: $ALBUM"
  ls -1 "$ALBUM/*.*"

  if [ $GAPLESS ]; then
    killall aplay
    mkfifo $FIFO
    aplay -t raw -c 2 -f S16_LE -r 44100 $FIFO &> $FIFO.log &
  fi;
  mplayer $MPLAYER_ARGS "$ALBUM"/*
  if [ $GAPLESS ]; then
    killall aplay
    rm $FIFO
  fi;
  echo "Waiting 3s until next album... Hit ctrl-c to quit"
  sleep 3s
done;