mlame

jpeg and mpeg 编解码技术源代码

#!/bin/bash 
#!/usr/local/bin/bash
############################################################################
#   
#  Run the LAME encoder on multiple files, with option to delete .wav files
#  after encoding.  "mlame -h" will give instructions.
#
#  Robert Hegemann <[e-mail]>
#
############################################################################

mp3coder="lame"
options="-h -d -m j -b 128"
rmsrc=false

helptext="\
\nThis script runs the LAME mp3 encoder on multiple files: \n\n\
$0 [options] <file 1> ... <file n>\n\
\n\
  options:\n\
    -h                  this help text\n\
    -r                  remove files after encoding\n\
    -o \"<lame options>\" overrides script default options \"${options}\"\n\
\n\
  example:\n\
    $0 -r -o \"-v -V 0 -b 112\" a*.wav z*.aif\n\
    \n\
"

#   process command-line options
#   this could be extended to fake the 
#   commandline interface of the mp3encoder

while getopts ":o:r" optn; do
    case $optn in
    o ) options=$OPTARG # replace default options
        ;; 
    r ) rmsrc=true
        ;;
    \? ) printf "$helptext"
        exit 1  
        ;;
    esac
done
shift $(($OPTIND - 1))

#   process input-files

for filename in "$@"; do
    case $filename in
    *[*?]*  )   # means shell couldn磘 extend *.wav, etc.
        echo "warning: no $filename file(s) found"
        ;;
    *[.][wW][aA][vV]  )
        name=${filename%[.][wW][aA][vV]}
        if $mp3coder $options "$filename" "${name}.mp3" 
        then
            if [ $rmsrc = true ]; then
                rm -f "$filename"
            fi
        fi
        ;;
    *[.][aA][iI][fF]  )
        name=${filename%[.][aA][iI][fF]}
        if $mp3coder $options "$filename" "${name}.mp3" 
        then
            if [ $rmsrc = true ]; then
                rm -f "$filename"
            fi
        fi
        ;;
    *   )
        if $mp3coder $options "$filename" "${filename}.mp3" 
        then
            if [ $rmsrc = true ]; then
                rm -f "$filename"
            fi
        fi
        ;;
    esac
done