path: root/2020/subtitles/emacsconf-2020--05-bard-bivoumacs-building-a-bandcamp-like-page-for-an-album-of-music--grant-shangreaux.vtt

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.

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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.

00:13:40.480 --> 00:13:46.455
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!