makeWebAudio.sh
author Jim Hague <jim.hague@acm.org>
Mon, 02 Sep 2013 10:15:56 +0100
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parent 394 ae9c05d2aafd
child 400 f1c4abe4fc75
permissions -rwxr-xr-x
Make 1/4, 1/2 and 3/4 speed audio for tunes. Name them 'veryslow', 'slow' and 'littleslow'.
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#!/bin/bash
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#
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# Make audio required for the website but not for the book.
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# They go into web/<book>.
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#
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if [ $# != 1 ]; then
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    echo "Usage: makeWebAudio.sh <book dir name>"
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    exit 1
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fi
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dir=`pwd`
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booke=$dir/$1
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builddir=$dir/web/$1
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mkdir -p $builddir
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# Make MP3 and OGG files for the input .abc. In case we're generating
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# to a live site (which we won't be), do this to temp files and rename
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# into place to make updates as atomic as possible.
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makeaudiofiles()
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{
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    name=`basename $1 .abc`
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    tmpname=${name}.tmp
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    abc2midi $1 -o $builddir/${tmpname}.mid
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    timidity -OwM -o $builddir/${tmpname}.wav $builddir/${tmpname}.mid
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    lame -m m -V 9 --quiet $builddir/${tmpname}.wav $builddir/${tmpname}.mp3
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    # Timidity can generate OGG directly. But we need to generate WAV
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    # for lame, and oggenc produces smaller output. OGG is needed for
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    # Firefox's audio tag. FF doesn't support MP3, some others support
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    # MP3 but not OGG.
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    oggenc -Q -q 0 -o $builddir/${tmpname}.ogg $builddir/${tmpname}.wav
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    mv $builddir/${tmpname}.mid $builddir/${name}.mid
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    mv $builddir/${tmpname}.mp3 $builddir/${name}.mp3
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    mv $builddir/${tmpname}.ogg $builddir/${name}.ogg
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    rm $builddir/${tmpname}.wav
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}
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# Make audio for a new tempo for the abc file $1, giving the output files
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# the same name with a prefix $2. The new tempo is the original tempo
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# (120 used if not specified), multiplied by $3 and divided by $4.
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makeaudiofortempo()
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{
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    name=`basename $filename .abc`
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    newspeedfilename="$2-${name}.abc"
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    # Prepare new speed audio files.
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    # The tempo is either a plain number, or <notelen>=<number>.
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    tempo=`$dir/abcfield.py --field Q $1`
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    if [ -z $tempo ]; then
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        echo "Warning: $1 has no tempo. Using 120."
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        tempo="120"
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    fi
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    pos=`expr index $tempo '='`
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    numtempo=${tempo:pos}
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    notelenprefix=${tempo:0:pos}
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    # Calculate new tempo.
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    newtempo=$(( ( $numtempo * $3 ) / $4 ))
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    # Insert new tempo and delete old. Old may not exist,
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    # so do this rather than overwrite.
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    sed -e "/^Q:/d" -e "/^K:/aQ: ${notelenprefix}${newtempo}" $1 > $builddir/$newspeedfilename
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    makeaudiofiles $builddir/$newspeedfilename
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    rm $builddir/$newspeedfilename
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}
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# Generate audio files and slow speed (currently half speed) audio files.
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find $booke -name "*.abc" | sort |
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    while read filename
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    do
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        makeaudiofiles $filename
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        # Now make 1/4, 1/2 and 3/4 speed audio.
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        makeaudiofortempo $filename "veryslow" 1 4
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        makeaudiofortempo $filename "slow" 1 2
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        makeaudiofortempo $filename "littleslow" 3 4
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    done