102 lines
2.2 KiB
Markdown
102 lines
2.2 KiB
Markdown
---
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title: "Podcast RSS Generator"
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date: 2024-09-02
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tags:
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- computers
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- featurephone
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---
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I wanted to play some audiobooks on my light phone,
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so I made a bourne shell script to generate an RSS feed.
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I was surprised that I couldn't find any prior work to do this.
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Put all your .mp3 files in a directory,
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then add [build.sh](build.sh)
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and `config.sh` with your settings:
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```sh
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title="My Audiobook"
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description="An audiobook I like"
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url="https://example.com/ebooks/mine"
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```
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The script
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will create `rss.xml` in the same directory.
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It uses `ffprobe` from ffmpeg to figure out each track's title.
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All my tracks have ID3 tags,
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so it may fail if yours don't.
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It can deal with spaces in filenames,
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but not double-quotes.
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`&` and `<` might cause problems too.
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Anyway, it's good enough for me.
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---
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Here's the script inline:
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```sh
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#! /bin/sh
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set -e
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cd $(dirname $0)
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. config.sh
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out="rss.xml"
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exec 1>$out
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echo "Writing to $out" 1>&2
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cat <<EOF
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<?xml version="1.0" encoding="utf-8"?>
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<rss xmlns:atom="http://www.w3.org/2005/Atom" xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd" version="2.0">
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<channel>
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<title>$title</title>
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<link>$url</link>
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<language>en</language>
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<description>$description</description>
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<atom:link href="$url/$out" rel="self" type="application/rss+xml" />
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EOF
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if [ -f cover.jpg ]; then
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cat <<EOF
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<image>
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<url>$url/cover.jpg</url>
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<title>$title</title>
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<link>$url</link>
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</image>
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EOF
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fi
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for fn in *.mp3; do
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echo "- $fn" 1>&2
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ffprobe -loglevel quiet -show_entries format -output_format json "$fn" > format.json
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title=$(cat format.json | jq -r '.format.tags.title')
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duration=$(cat format.json | jq -r '.format.duration | tonumber | ceil')
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#bps=$(cat format.json | jq -r '.format.bit_rate')
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#kbps=$(($bps / 1000))
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rm format.json
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guid=$(sha1sum "$fn" | awk '{print $1}')
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size=$(stat -c %s "$fn")
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mtime=$(date -R -d @$(stat -c %Y "$fn"))
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ufn=$(echo $fn | tr ' ' '+')
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cat <<EOF
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<item>
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<title>$title</title>
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<pubDate>$mtime</pubDate>
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<itunes:duration>$duration</itunes:duration>
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<enclosure url="$url/$ufn" type="audio/mpeg" length="$size" />
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<guid isPermaLink="false">$guid</guid>
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</item>
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EOF
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done
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cat <<EOF
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</channel>
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</rss>
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EOF
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```
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