Just another hack for MPC (from MPD) to play a set of MP3's listed in a script (inside MPD DB) written by Rodrigo Martínez (roroMarti), based from playJingle.sh written by Marcel van der Schans and his inspiration stop_after_current.sh by Harun Vos

#!/bin/bash

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

# playMPCRandomAd.sh #

# Just another hack for MPC (from MPD) to random play a set of MP3's listed in a script (inside MPD DB) #

# #

# Try to put this script calling from a scheduler (cron) in order tu execute in a lapse time each ie 10 minutes #

# Write by Rodrigo Martínez (roro Marti) #

# #

# Writen based on playJingle by Marcel van der Shans, and this inspired in   #

# stop_after_current.sh by Harun Vos. #

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


##########  VARIABLES SECTION ############


# Requires mpc (Music player Control) - set the path here.

MPC=mpc

JINGLE=""



# Insert here in this list (Mp3PLayList) the mp3's that you need random for.

# This mp3's needs be inside the MPD Database structure

# You could test if the mp3 exist in this database executing in a linux console as follow:

#     >_  mpc add yourmp3file.mp3  (this command add at the last of the queue play list the song yourmp3file.mp3)

# if this command is 

#     good:   mpc answer >_ "<empty answer>" = ""

#     bad :   mpc answer >_ "error: directory or file not found"    


Mp3PlayList="ea1.mp3

ea2.mp3

ea3.mp3"


##########  FUNCTION's SECTION ############

# Extract the interesting line from the mpc output.

# There must be a nicer way of dealing with multi-line shell variables.

function getDetailsLine()

{

  mpc > temporal.tmp

  d=$(cat temporal.tmp | head -2 temporal.tmp  | tail -1)

  echo $d

}


# Get the playing/paused status.

function getStateFromLine()

{

  echo $*|cut -d' ' -f1

}


# Get the number of the currently playing song.

function getSongFromLine()

{

  echo $*|cut -d' ' -f2|cut -d'/' -f1|cut -d'#' -f2

}


# Get the number of the last song / the length of the playlist.

function getLastSongFromLine()

{

  echo $*|cut -d' ' -f2|cut -d' ' -f1|cut -d'/' -f2

}



# let god say wich mp3 to play.

function randomJingle()

{

  RANDOM=$$        # Reseed the random number generator using script process ID.

  mp3PlayList=($Mp3PlayList) # Read into array variable.

  mp3Elements=${#mp3PlayList[*]} # Count how many elements.

  # echo ${mp3PlayList[$((RANDOM%mp3Elements))]} # Debug line

  echo ${mp3PlayList[$((RANDOM%mp3Elements))]}

}



######    PROCEDURE SECTION   #######


# Dont do anything if we arent playing.


details=$(getDetailsLine)  

currState=$(getStateFromLine $details)

if [ "$currState" != "[playing]" ]; then exit; fi


# Add jingle to (end of) playlist.


#JINGLE =$(randomJingle)

$MPC add $(randomJingle)


# Refresh our details line

details=$(getDetailsLine)


currSong=$(getSongFromLine $details)

lastSong=$(getLastSongFromLine $details)


# Move the last song (our jingle) to the next entry.

let nextSong=currSong+1

$MPC move $lastSong $nextSong


##########  EOF #########################