makeWebAudio.sh
author Jim Hague <jim.hague@acm.org>
Fri, 13 Oct 2017 17:19:06 +0100
changeset 753 b83b49f2a0a0
parent 748 ce5c7214f9aa
child 943 d6e2a281cceb
permissions -rwxr-xr-x
Correct Mac-ism. find -maxdepth n, not find -depth n.
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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. Since we're listening to
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# a doorbell playing the tunes, go for lowest quality (and hence smallest)
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# MP3 and OGG. $1 is the input filename, $2 is optional args for timidity.
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makeaudiofiles()
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{
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    name=`basename $1 .abc`
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    abc2midi $1 -o $builddir/${name}.mid
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    timidity -OwM $2 -o $builddir/${name}.wav $builddir/${name}.mid
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    lame -m m -V 9 --quiet $builddir/${name}.wav $builddir/${name}.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 $builddir/${name}.ogg $builddir/${name}.wav
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    rm $builddir/${name}.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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# These audio files are for Learner use; I've found that having the
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# chords thumping away can make it hard to distinguish the melody, so
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# arrange for timidity to mute everything except the melody track.
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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 --mute=0,-1
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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 -maxdepth 1 -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" 2 4
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        makeaudiofortempo $filename "littleslow" 3 4
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        makeaudiofortempo $filename "normal" 4 4
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    done