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HuckleSmothered 11-27-2009 08:41 PM

Make a DATA cd of mp3's from m3u playlists
 
Been looking around for a long time for a way to make a DATA cd from a .m3u playlist. The only option that any Ubuntu available audio application, like Banshee, Rhythmbox or Exaile, has that I found was to burn an audio cd.

So, after much disappointment, I decided to create a little script to do it outside of an application. I've tested it and it seems to work quite well. Hope it can help some of you out there.

Some explanations on why I wrote it the way I did:
I didn't make it all text/terminal based and used some Zenity because of the difficulty in typing in a filename/path without the tab completion, which I hear might be possible in a script but I can't figure it out.
I also didn't make it all arguments to the script itself because, while I did figure out how to do that, I was making in for the purpose of putting several playlists onto one disc. About a dozen to be specific. And as far as I know, the shell only accepts 9 arguments, minus the option flag of something like -f in front of each file means the number of playlists I could add just went well below nine.
I didn't use all Zenity pop-ups because of the need/desire for yes/no questions. Which Zenity's --question option gives an OK/Cancel selection. Plus Zenity is quite a bit slower with its pop-ups than just a line or two of text.
Uses Brasero to burn because that's what I use ... code it for K3B or whatnot. It would be a single line that would need to be changed as long as you know the command to call a new K3B data project with a folder as the argument.

Code:

#!/bin/bash
# Burn m3u playlists as a data disc via Brasero
# Functions listed at beginning, commands to call them at the bottom

################################################
################## FUNCTIONS ###################
################################################

################################################
######### Ensures Brasero is installed #########
################################################
check_ForBraseroApp ()
{
        if [ -f `which brasero` ]; then
                check_NumberOfM3Us
                else echo "Brasero application is required but not found\nEnsure it is installed correctly and try again\nExiting"
                exit 1
        fi
}

################################################
######## Choose multiple or single m3u #########
################################################
check_NumberOfM3Us ()
{
        read -p "Will multiple playlists be used? (y/n): " YN
        case $YN in
                y)
                        id_TempFolder;;
                n)
                        echo -e "Playlist being exported to Brasero ... \n"                       
                        burn_1M3U;;
                *)
                        echo "Answer was not recognized as 'y' or 'n', try again"
                        check_NumberOfM3Us;;
        esac
}

################################################
######## Sends a single m3u to Brasero #########
################################################
burn_1M3U ()
{
        M3U=`zenity --title="Select M3U Playlist" --file-selection`
        sed '/^#/d;s/^/"/g;s/$/"/g' $M3U | tr '\n' ' ' | xargs brasero -d &
}

################################################
######## Identify temporary directory ##########
################################################
id_TempFolder ()
{
        if [ -w /tmp ]; then
                TEMPDIR=/tmp
                elif [ -w /temp ]; then
                        TEMPDIR=/temp
                elif [ -w $HOME ]; then
                        TEMPDIR=$HOME
                else echo -e "Could not find a temp directory with write access\nChecked /tmp, /temp/ and $HOME\n"
                        exit
        fi
        make_PlaylistFolder
}

################################################
####### Make the temp playlist folder ##########
################################################
make_PlaylistFolder ()
{
        N=1
        PLAYLISTFOLDER=$TEMPDIR/playlist$N.tmp
        while [ -d $PLAYLISTFOLDER ]
        do
                echo -e "$PLAYLISTFOLDER exists"
                N=$((N+1))
                PLAYLISTFOLDER=$TEMPDIR/playlist$N.tmp
                echo -e "Trying $PLAYLISTFOLDER instead"
        done
        echo "Creating temporary playlist folder at $PLAYLISTFOLDER"
        mkdir $PLAYLISTFOLDER &&
        echo "$PLAYLISTFOLDER created successfully"
        check_M3Uformat
}

##############################################################
##### Confim m3u playlist file names meet specifications #####
##############################################################
check_M3Uformat ()
{
        echo -e "\nM3U Playlists Requirements:\n\t1. Must have the .m3u extension\n\t2. Must contain only ONE period (.) in entire filename"
        read -p "Do the target m3u playlists conform to these specifications? (y/n): " YN
        case $YN in
                y)
                        select_M3U;;
                n)
                        echo -e "Rename m3u playlists to meet specifications.\nExiting"
                        delete_TempFolder;;
                *)
                        echo -e "Answer was not recognized as 'y' or 'n', try again"
                        check_M3Uformat;;
        esac
}

################################################
##### Select m3u playlists through Zenity ######
################################################
select_M3U ()
{
        M3U=`zenity --title="Select M3U Playlist" --file-selection`
        # M3U file integrity check
        if [ `echo $M3U | awk -F. '{print $NF}'` == m3u ]; then
                echo "File format validated"
                cp $M3U $PLAYLISTFOLDER/ &&
                make_M3UsubFolder
                check_ForMoreM3Us
                else echo -e "File does not have the required .m3u extension\nEnsure file is in correct format and try again"
                check_ForMoreM3Us
        fi
}

################################################
#### Ask if more m3u files need to be added ####
################################################
check_ForMoreM3Us ()
{
        read -p "Select more m3u playlists? (y/n): " YN
        case $YN in
        y)
                select_M3U;;
        n)
                create_BraseroDisc;;
        *)
                echo "Answer was not recognized as 'y' or 'n', try again"
                check_ForMoreM3Us;;
        esac
}

################################################
####### Make the m3u specific subfolder ########
################################################
make_M3UsubFolder ()
{
        PLAYLIST=`echo $M3U | awk -F/ '{print $NF}' | cut -d. -f1`
        M3UTEMP=`echo $M3U | awk -F/ '{print $NF}'`
        mkdir $PLAYLISTFOLDER/$PLAYLIST/ &&
        import_PlaylistContents
}

##############################################################
##### Populate m3u subdirectories with playlist contents #####
##############################################################
import_PlaylistContents()
{
        sed -i '/^#/d;s/^/"/g;s/$/"/g' $PLAYLISTFOLDER/$M3UTEMP &&
        cat $PLAYLISTFOLDER/$M3UTEMP | xargs ln -st $PLAYLISTFOLDER/$PLAYLIST/ &&
        echo -e "$PLAYLIST.m3u playlist imported successfully"
}

################################################
############# Import to Brasero ################
################################################
create_BraseroDisc ()
{
        read -p "Open data cd with content from m3u playlists in Brasero now? (y/n): " YN
        case $YN in
        y)
                echo -e "Once you have closed Brasero, you will be given an option to clean up temp folders\nThis cannot be done until after the disc is created though"
                brasero -d $PLAYLISTFOLDER/*/
                delete_TempFolder;;
        n)
                echo -e "Skipping Brasero"
                delete_TempFolder;;
        *)
                echo -e "Answer was not recognized as 'y' or 'n', try again"
                create_BraseroDisc;;
        esac
}

################################################
####### Cleanup temporary directories ##########
################################################
delete_TempFolder ()
{
        echo -e "Temp directory still exists with m3u contents"
        read -p "Cleanup now? (y/n): " YN
        case $YN in
        y)
                rm -R $PLAYLISTFOLDER &&
                echo -e "Cleanup finished\nExiting"
                exit 0;;
        n)
                echo -e "$PLAYLISTFOLDER still exists\nExiting"
                exit 0;;
        *)
                echo -e "Answer was not recognized as 'y' or 'n', try again"
                delete_TempFolder;;
        esac
}

################################################
############## END OF FUNCTIONS ################
################################################

clear
echo -e "
***** Burn m3u playlists as a data disc via Brasero *****
"
check_ForBraseroApp


David the H. 11-28-2009 12:36 PM

FYI: you aren't limited to 9 arguments (a.k.a. positional parameters). You just have to use the longer pattern for calling variables to access them: e.g. "${10}". You could also use shift to remove any unwanted parameters from the beginning of the list, then call all the remaining arguments at once with "$@"

I just tried this in k3b and it seems to work fairly well, although it spits out an error for all the lines that it doesn't recognize as files.
Code:

k3b --datacd $(cat Playlist.m3u)
You could of course run the cat through grep or sed to filter out comment lines first, if necessary.

HuckleSmothered 12-03-2009 05:33 PM

There's a line in the function "import_PlaylistContents" that removes all the comment lines as well as puts quotes around each playlist item, in case it has spaces in it, as all of mine do.

Code:

sed -i '/^#/d;s/^/"/g;s/$/"/g' $PLAYLISTFOLDER/$M3UTEMP &&
Did you change anything besides the function "create_BraseroDisc" when you changed from Brasero to K3B?


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