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annotate makeWebAudio.sh @ 1035:889ae46036fb
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author | Jim Hague <jim.hague@acm.org> |
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date | Wed, 19 Feb 2020 13:30:24 +0000 |
parents | c9d57876e249 |
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First go at producing a very simple website.
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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/$1 |
943 | 15 basewebdir=$dir/web |
16 basetunedir=$basewebdir/tunes | |
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17 |
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18 # Make MP3 and OGG files for the input .abc. Since we're listening to |
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19 # a doorbell playing the tunes, go for lowest quality (and hence smallest) |
943 | 20 # MP3 and OGG. $1 is the input filename, $2 is the output directory, |
21 # $3 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` |
943 | 25 tunedir="$2" |
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26 |
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27 abc2midi $1 -o $tunedir/${name}.tmp.mid -silent |
943 | 28 mv $tunedir/${name}.tmp.mid $tunedir/${name}.mid |
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29 timidity --quiet -OwM $3 -o $tunedir/${name}.wav $tunedir/${name}.mid |
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30 lame -m m -V 9 --silent $tunedir/${name}.wav $tunedir/${name}.tmp.mp3 |
943 | 31 mv $tunedir/${name}.tmp.mp3 $tunedir/${name}.mp3 |
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32 # Timidity can generate OGG directly. But we need to generate WAV |
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33 # for lame, and oggenc produces smaller output. OGG is needed for |
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34 # Firefox's audio tag. FF doesn't support MP3, some others support |
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35 # MP3 but not OGG. |
943 | 36 oggenc -Q -q 0 -o $tunedir/${name}.tmp.ogg $tunedir/${name}.wav |
37 mv $tunedir/${name}.tmp.ogg $tunedir/${name}.ogg | |
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38 |
943 | 39 rm $tunedir/${name}.wav |
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40 } |
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41 |
943 | 42 # Make audio for a new tempo for the abc file $1, giving the output |
43 # files the same name with a prefix $3 in output directory $2. The new | |
44 # tempo is the original tempo (120 used if not specified), multiplied | |
45 # by $4 and divided by $5. These audio files are for Learner use; | |
46 # I've found that having the chords thumping away can make it hard to | |
47 # distinguish the melody, so arrange for timidity to mute everything | |
48 # except the melody track. | |
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49 makeaudiofortempo() |
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50 { |
943 | 51 name=`basename $1 .abc` |
52 tunedir="$2" | |
53 newspeedfilename="$3-${name}.abc" | |
54 mkdir -p $tunedir | |
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55 |
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56 # Prepare new speed audio files. |
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57 # The tempo is either a plain number, or <notelen>=<number>. |
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58 tempo=`$dir/abcfield.py --field Q $1` |
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59 if [ -z $tempo ]; then |
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60 echo "Warning: $1 has no tempo. Using 120." |
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61 tempo="120" |
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62 fi |
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63 numtempo=${tempo##*=} |
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64 notelenprefix=${tempo%%=*} |
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65 if [ "$notelenprefix" = "$numtempo" ]; then |
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66 notelenprefix= |
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67 else |
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68 notelenprefix="${notelenprefix}=" |
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69 fi |
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70 # Calculate new tempo. |
943 | 71 newtempo=$(( ( $numtempo * $4 ) / $5 )) |
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72 echo "Old tempo $tempo new tempo ${notelenprefix}${newtempo}" |
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73 # Insert new tempo and delete old. Old may not exist, |
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74 # so do this rather than overwrite. |
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75 sed -e "/^Q:/d" -e "/^K:/a\\ |
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76 Q: ${notelenprefix}${newtempo}" $1 > $tunedir/$newspeedfilename |
943 | 77 makeaudiofiles $tunedir/$newspeedfilename $tunedir --mute=0,-1 |
78 rm $tunedir/$newspeedfilename | |
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79 } |
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80 |
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81 # Generate audio files and slow speed (currently half speed) audio files. |
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82 find $booke -maxdepth 1 -name "*.abc" | |
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83 while read filename |
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84 do |
943 | 85 name=`basename $filename .abc` |
86 tunedir=$basetunedir/$name | |
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87 |
943 | 88 mkdir -p $tunedir |
89 | |
90 makeaudiofiles $filename $tunedir | |
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91 |
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92 # Now make 1/4, 1/2 and 3/4 speed audio. |
943 | 93 makeaudiofortempo $filename $tunedir "veryslow" 1 4 |
94 makeaudiofortempo $filename $tunedir "slow" 2 4 | |
95 makeaudiofortempo $filename $tunedir "littleslow" 3 4 | |
96 makeaudiofortempo $filename $tunedir "normal" 4 4 | |
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97 done |