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annotate makeWebAudio.sh @ 936:037724386f8a build-default-342

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And dial back on the exclamation marks.
author Jim Hague <jim.hague@acm.org>
date Sun, 04 Aug 2019 15:10:53 +0100
parents b83b49f2a0a0
children d6e2a281cceb
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1 #!/bin/bash
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2 #
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3 # Make audio required for the website but not for the book.
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4 # They go into web/<book>.
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5 #
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6
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7 if [ $# != 1 ]; then
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8 echo "Usage: makeWebAudio.sh <book dir name>"
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9 exit 1
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10 fi
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11
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12 dir=`pwd`
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13
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14 booke=$dir/$1
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15 builddir=$dir/web/$1
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16
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17 mkdir -p $builddir
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18
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19 # Make MP3 and OGG files for the input .abc. Since we're listening to
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20 # a doorbell playing the tunes, go for lowest quality (and hence smallest)
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21 # MP3 and OGG. $1 is the input filename, $2 is optional args for timidity.
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22 makeaudiofiles()
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23 {
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24 name=`basename $1 .abc`
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25
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26 abc2midi $1 -o $builddir/${name}.mid
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27 timidity -OwM $2 -o $builddir/${name}.wav $builddir/${name}.mid
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28 lame -m m -V 9 --quiet $builddir/${name}.wav $builddir/${name}.mp3
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29 # Timidity can generate OGG directly. But we need to generate WAV
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30 # for lame, and oggenc produces smaller output. OGG is needed for
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31 # Firefox's audio tag. FF doesn't support MP3, some others support
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32 # MP3 but not OGG.
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33 oggenc -Q -q 0 -o $builddir/${name}.ogg $builddir/${name}.wav
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34
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35 rm $builddir/${name}.wav
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36 }
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37
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38 # Make audio for a new tempo for the abc file $1, giving the output files
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39 # the same name with a prefix $2. The new tempo is the original tempo
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40 # (120 used if not specified), multiplied by $3 and divided by $4.
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41 # These audio files are for Learner use; I've found that having the
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42 # chords thumping away can make it hard to distinguish the melody, so
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43 # arrange for timidity to mute everything except the melody track.
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44 makeaudiofortempo()
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45 {
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46 name=`basename $filename .abc`
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47 newspeedfilename="$2-${name}.abc"
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48
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49 # Prepare new speed audio files.
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50 # The tempo is either a plain number, or <notelen>=<number>.
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51 tempo=`$dir/abcfield.py --field Q $1`
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52 if [ -z $tempo ]; then
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53 echo "Warning: $1 has no tempo. Using 120."
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54 tempo="120"
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55 fi
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56 pos=`expr index $tempo '='`
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57 numtempo=${tempo:pos}
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58 notelenprefix=${tempo:0:pos}
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59 # Calculate new tempo.
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60 newtempo=$(( ( $numtempo * $3 ) / $4 ))
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61 # Insert new tempo and delete old. Old may not exist,
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62 # so do this rather than overwrite.
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63 sed -e "/^Q:/d" -e "/^K:/aQ: ${notelenprefix}${newtempo}" $1 > $builddir/$newspeedfilename
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64 makeaudiofiles $builddir/$newspeedfilename --mute=0,-1
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65 rm $builddir/$newspeedfilename
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66 }
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67
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68 # Generate audio files and slow speed (currently half speed) audio files.
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69 find $booke -maxdepth 1 -name "*.abc" | sort |
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70 while read filename
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71 do
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72 makeaudiofiles $filename
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74 # Now make 1/4, 1/2 and 3/4 speed audio.
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75 makeaudiofortempo $filename "veryslow" 1 4
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76 makeaudiofortempo $filename "slow" 2 4
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77 makeaudiofortempo $filename "littleslow" 3 4
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78 makeaudiofortempo $filename "normal" 4 4
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79 done