WEBVTT
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Hello, my name is Grant Shangreaux.
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This is my talk titled Bard Bivou(m)acs:
Publishing Music with Emacs.
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I'm a software developer with Unabridged
Software in Lincoln, Nebraska.
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Long time Emacs user, relatively new
Emacs hacker.
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Hopefully, I'll be able to show you
my workflow,
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with how I publish music with Emacs.
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All right. So as a musician, I would
like to publish my music online.
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I could publish with popular online
music services,
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but I'm more of a DIY-type,
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so I chose to go ahead and
publish with Emacs.
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What's the motivation behind this?
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A lot of it comes down to some
fundamental freedoms
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that Emacs and GNU software
represent to me,
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as well as my ideas on culture and my
background.
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I don't believe that music is
a consumer good.
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It's a form of knowledge, like an
algorithm.
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And it's just such a part of culture,
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like in tribal cultures,
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music was seen as a gift from the cosmos
or the gods.
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It was a gift maybe through an
individual vessel,
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but was shared with the people
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and shared with everyone,
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kept alive by the culture itself.
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So to me, music is something that
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should be shared and should be
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freely enjoyed by everyone.
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Of course, artists should be
compensated as well,
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but that's a whole different topic.
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So when I want to share my music,
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I want to do it without impacting
anyone's freedom.
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Using GNU software like Emacs
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is a good way that I can ensure that
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I won't be requiring people
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to sign away their freedoms for
anything.
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There's a lot more I could say
about this
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but I don't have time.
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Feel free to reach out to me by
email or IRC.
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Part of the motivation for me,
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personally, is that Emacs is super
magical.
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It's an all-in-one solution.
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Like I said, the GNU software aligns with
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Creative Commons' ideas.
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I can do file management.
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I can author HTML, all the web stuff
I need even, literate-style.
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I can handle media and metadata.
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I've got version control, remote server
access...
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All the tools I need are right under my
fingertips with this tool
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that I use every day for a long time.
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I don't need to look elsewhere.
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It was a challenge.
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I wanted to see if I could do this
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all within Emacs itself.
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So, how do you use Emacs to publish music?
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Well, for me, I needed
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a couple of things.
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I needed to be able to audition and
label unlabeled audio tracks.
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I have a lot of files that
I don't know where they came from.
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I don't know what they are.
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I need to be able to listen to them,
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and I need to be able to add metadata to
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whatever audio format it is
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and rename the files based on that
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metadata, potentially.
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And in the end, I wanted to take those
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files and programmatically produce a web page
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for people to consume.
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I found out that Emacs scores a hundred
percent on all of
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these requirements that I had for this,
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and a lot of that came from EMMS, the
Emacs multimedia system.
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EMMS is great.
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If you haven't checked it out, please do.
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It's a little bit unintuitive,
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but once you get into it, you know it
works.
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Basically, what EMMS gave me was
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the ability to listen to the tracks,
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organize playlists.
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On top of that, it gave me
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super-powered metadata authoring.
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I'm going to demonstrate that to you.
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So in order to do this,
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you have to require markable playlists,
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so (require 'emms-mark). I'm going to
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go through, and I'm going to open the red...
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I've got this. These files here.
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So you can see these files are mp3s.
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They're recorded on a digital recorder.
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If I had the choice, I would have a
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recorder that used a different format,
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but so be it. I can mark all these files
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and I can do EMMS add to .., and now
they've been loaded into a playlist.
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So you can see the playlist here.
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There's some leftover files.
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So I've got these three files
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in my playlist, and as you can see,
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it's just the file name, the path.
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I don't have any metadata associated
with them.
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In this playlist, I can hit E,
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and it'll bring up a buffer showing
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the tag information that I have.
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I could edit these here.
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I could edit them one at a time,
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but that's not really great. I want
superpower metadata authoring.
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So, by marking them, I can then hit E,
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and I have all three of the tracks
loaded up in this tags buffer.
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On top of that, I can do EMMS tag
editor,
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set all, C-c C-r, and I want to
set the artist.
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so these are some recordings of my
family.
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So, Shangreaux, set all three of them.
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I want to set the album:
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Spring Walk with Lap Harp.
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I want to set the year.
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And then I'm going to go ahead and put
these in manually,
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but with the power of Emacs
keyboard macros
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and registers and so on. I could do this
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programmatically as well,
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which would make it a lot easier
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if I had much more than three files to
do this with.
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Submit the changes with C-c C-c,
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and now we've got the playlist.
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You can see the artist and track number
have been updated here.
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And then the final piece of this is that
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if you look at this, you can see that
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the file name is still the same.
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So if I were looking at the directory,
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I would still have this file name.
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When packaging these up for a release,
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for people to download,
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it's nice to be able to have that
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filename reflect the track number
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and the artist and so on.
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So there's another command,
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EMMS rename tag editor, rename,
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so it could be just capital R.
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I think I need to mark all of these,
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hit capital R, and then it's going to
ask me to confirm
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and say yes to all of them.
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And now, if you look in the--
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whoops I have to update it--you'll see
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it's been updated with the artist,
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track number and track name.
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This format is a format string,
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so it's customizable of course.
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I just decided to go with the default.
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So that's pretty great, this workflow
just with EMMS.
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I didn't have to do anything. This is
all there.
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It's all built in. It gave me exactly
what I was looking for
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in terms of being able to process a lot
of raw audio files,
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add metadata to them, and get them ready
for publishing.
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And this is for publishing for playback
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in any media player. It'll be useful.
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Not just for the web page that I'm
building.
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So the final part, of course, is to
build the web page.
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Emacs makes authoring HTML trivial.
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As I was going through this,
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I wanted to challenge myself and just
be, like,
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can I do this just all with Emacs?
Can I just make this?
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I don't need a... I don't need Ruby.
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I don't need Rails. I don't need Node.
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I don't need any of this other stuff.
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I have my tool right here. It's a
fully...
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It's a whole operating system, basically,
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plus programming languages.
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So the first thing I started with
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was buffer scripting for
manipulating text.
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That's kind of the easiest way to do it.
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Basically, anything you can do in
a buffer,
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you can do programmatically with Elisp.
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So this might be a good example for
beginners.
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If you haven't done any Elisp yet,
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a simple example is to create this div
output here.
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You can use this with-temp-buffer,
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so basically creating an imaginary
buffer.
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insert is just like typing,
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so you put strings in,
you put new lines in,
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you can build some strings together.
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Here you can see I'm doing a random
number,
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so every time I execute this,
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my content changes.
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I can generate dynamic content in HTML
blocks with Elisp.
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For my web page builder, it's a little
more complex.
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I'm pulling data out
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using EMMS data structures,
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so it's pulling that out from
the track data.
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And then I'm using some program to
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generate list elements, so each track is
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going to have the title and
track number,
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and then a button for playing it,
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plus the source of the audio file,
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which will get added here.
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Right now, this is hard coded for Opus,
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so it won't work for my MP3s.
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I'm going to skip over snippets.
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Turns out format strings were good
enough for me.
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Snippets could be useful,
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but format is super powerful,
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and I didn't really even need
all that much power,
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basically, just doing string
interpolation.
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So if you haven't seen format before,
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you basically put these control strings
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or control characters inside of a string,
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and you can generate an output string
that you want.
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So in my generator code, basically,
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it's down here,
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I'm calling format with this Bard
Bivou(m)acs template,
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and that's basically a big string of
HTML.
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It's just my whole page of HTML
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with those control characters in just
four places.
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One of them populates the track list.
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That's really the meat of the program.
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Again, this is a combination of using
buffer scripting, using HTML mode,
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inserting text format strings,
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and then I can indent-region
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so the HTML actually looks pretty
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when it comes out of it as well.
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I will show that, just really quick
actually.
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So you can see, this is the HTML that
got generated.
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I've got my template.
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I inserted the title here, the style,
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the font was all inserted,
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and then this whole list of of tracks here.
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It's kind of messy to look at,
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but this track list, this whole div here,
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is all generated by my generator code,
and it works. It's great.
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Okay, moving on.
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So the other thing was that as I was
developing this,
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I decided to use Org Babel
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and some of its features for
multi-language things
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because I needed to style it with CSS
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and put actions in Javascript,
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and also I used SVG for authoring stuff.
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It was a little bit complicated.
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It probably would have been simpler
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had I not used Org Babel,
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but it's also really fun.
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I think it's a cool, cool idea to use
literate programming.
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My idea was to create HTML
components.
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I could name it like this,
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put a format string inside it,
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and build a function
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in Elisp to format it
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and spit out the HTML that I want.
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By doing this, then,
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I can just change things in my Org file,
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which, not getting a whole lot of time
to work on it,
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I can come back to it
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and I have a lot of notes.
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I can kind of generate things as I'm
going
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and keep notes for myself,
and keep the...
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I don't know. It's cool.
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Literate programming is fun.
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So I don't need to
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go into that too much, but you can see if
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I execute this here,
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I get the the div that I want.
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It's a little bit funny.
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You'll see I have the string like this,
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the way that noweb expands, I can't do
this on a single line.
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It looks funny when you do that,
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so that might be something
to work out later.
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CSS blocks can either be tangled out
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and referenced in the HTML source,
or inlined.
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Here's an example I have of inlining it.
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So I've got my little CSS block
named style,
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Javascript named script,
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and then I've got this HTML source block
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with noweb expansion.
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These double angle brackets here
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are where I'm going to expand
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the block named style. I'm actually
calling a function,
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so I want the result of the
function here,
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and then the script will just get
expanded here.
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So org-babel-expand-src-block,
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you can see what it looks like.
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I've got my style here. I've got my title.
00:13:28.160 --> 00:13:31.279
I've got that main content class I
showed before,
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and the script as well.
So that's kind of cool.
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I could just run org-babel-tangle and
get my thing out
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and just edit one file instead of
multiple files.
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Not for everyone, but I thought it was
kind of fun. All right.
00:13:46.455 --> 00:13:48.807
Oh, and the final thing is
that in Emacs,
00:13:48.807 --> 00:13:51.320
you can author and view SVG.
00:13:51.320 --> 00:13:58.297
So this is just an Org. This SVG, I used
to make the play and pause buttons.
00:13:58.297 --> 00:13:59.519
I didn't know this,
00:13:59.519 --> 00:14:02.162
but if you edit an SVG file,
00:14:02.162 --> 00:14:08.800
you can toggle back and forth
00:14:08.800 --> 00:14:13.199
between the code and the image.
00:14:13.199 --> 00:14:17.360
It's pretty sweet. So I can iteratively
00:14:17.360 --> 00:14:20.560
work through this
because of how Emacs is.
00:14:20.560 --> 00:14:24.959
Final considerations here,
00:14:24.959 --> 00:14:26.247
like when doing this,
00:14:26.247 --> 00:14:27.606
I want it to be all free,
00:14:27.606 --> 00:14:30.079
so I want to use fonts that use a free
license.
00:14:30.079 --> 00:14:32.800
I found GNU Unifont. It's kind of cool.
00:14:32.800 --> 00:14:34.333
The content license...
00:14:34.333 --> 00:14:37.600
I chose Creative Commons Attribution
ShareAlike,
00:14:37.600 --> 00:14:39.920
which is kind of like the GPL.
00:14:39.920 --> 00:14:42.663
Ideally, I could serve it with Emacs.
00:14:42.663 --> 00:14:46.320
I'd like to remove idiosyncrasy so other
people can use it.
00:14:46.320 --> 00:14:48.720
It's pretty much just my tool right now.
00:14:48.720 --> 00:14:50.734
Not requiring the web browser...
00:14:50.734 --> 00:14:56.648
I can ship playlists so that you can
just click or link to a playlist
00:14:56.648 --> 00:15:00.068
on your favorite player, even EMMS if
you want,
00:15:00.068 --> 00:15:04.320
and then packing up those albums in like
a ZIP or .tar file.
00:15:04.320 --> 00:15:08.639
So you can go to churls.world .
00:15:08.639 --> 00:15:10.644
It just has a link to this album.
00:15:10.644 --> 00:15:14.000
I'll display it here in just a second.
00:15:14.000 --> 00:15:17.519
You can contact me. I'm shoshin on #emacs
00:15:17.519 --> 00:15:21.040
in IRC and on sourcehut. You can email me:
00:15:21.040 --> 00:15:23.680
grant@churls.world, personal, or
00:15:23.680 --> 00:15:26.800
grant@unabridgedsoftware.com.
All right, now.
00:15:26.800 --> 00:15:32.079
Let's see about this...
00:15:32.079 --> 00:15:34.316
This is up online, so if you
want to listen
00:15:34.316 --> 00:15:39.199
to my college band's album from
20 years ago,
00:15:39.199 --> 00:15:43.040
here it is: Cassiopeia Basement Days.
00:15:43.040 --> 00:15:46.887
Whoops. I made this art in Krita.
00:15:46.887 --> 00:15:51.199
You can press play. You can skip around.
00:15:51.199 --> 00:15:55.040
I do have the playlist up here too.
00:15:55.040 --> 00:15:58.560
So yeah, thanks for listening.
00:15:58.560 --> 00:16:07.360
I hope you enjoyed it, and enjoy the
rest of EmacsConf. Goodbye!
