How to show the metadata when listening to audio streams?

[Rodrigo Morales]

* Table of contents

1. Prologue
2. The question

* Prologue

Consider the following minimal =init.el= file

#+BEGIN_SRC elisp
(require 'emms)
(require 'emms-player-mpv)
(require 'emms-streams)

(setq emms-player-list '(emms-player-mpv))
(setq emms-player-mpv-parameters '("--quiet" "--really-quiet" 
"--no-audio-display" "--force-window=no"))

(emms-streams-install)
#+END_SRC

If I use that configuration as my =init.el= file and then execute =M-x
emms-streams=. The buffer =Emms Streams= is opened containing the
following lines

#+BEGIN_EXAMPLE
streamlist: http://www.somafm.com/beatblender.pls
streamlist: http://www.somafm.com/secretagent.pls
streamlist: http://www.somafm.com/groovesalad.pls
streamlist: http://www.somafm.com/dronezone.pls
streamlist: http://www.somafm.com/tagstrance.pls
streamlist: http://www.somafm.com/indiepop.pls
streamlist: http://www.somafm.com/doomed.pls
http://listen.radionomy.com:80/-PHILOSOMATIKAPROGRESSIVE-
streamlist: http://www.bassdrive.com/BassDrive.m3u
streamlist: http://www.ibiblio.org/wcpe/wcpe.pls
streamlist: http://stream.nute.net/kohina/stream.ogg.m3u
streamlist: http://privat.is-by.us:8000/necta192.mp3.m3u
streamlist: http://nectarine.from-de.com/necta192.m3u
streamlist: http://www.wfmu.org/wfmu.pls
streamlist: http://wfmu.org/wfmu_rock.pls
streamlist: http://wfmu.org/wfmu_drummer.pls
streamlist: http://wfmu.org/wfmu_sheena.pls
streamlist: http://nyc01.egihosting.com:6232/listen.pls
streamlist: http://199.244.85.125:8000/wxhq1
#+END_EXAMPLE

Now, if I execute the following command (to get the information of the
track at point) in the first line (i.e. in the track =streamlist:
http://www.somafm.com/beatblender.pls=), the following is obtained

#+BEGIN_SRC emacs-lisp
(with-current-buffer "Emms Streams"
  (beginning-of-buffer)
    (emms-playlist-track-at (point)))
#+END_SRC

#+RESULTS:
#+BEGIN_EXAMPLE
(*track*
  (type . streamlist)
  (name . "http://www.somafm.com/beatblender.pls";)
  (metadata "SomaFM: Beatblender" "http://www.somafm.com/beatblender.pls"; 1 
streamlist))
#+END_EXAMPLE

=(emms-playlist-track-at (point))= is able to get the name of the stream
because the file =~/.config/emacs/emms/streams.emms= (which is created by
the function =emms-streams-install=) contains this metadata.

* The question

As I shown before in the #+BEGIN_EXAMPLE block, the URL is shown for
each stream in the "Emms Streams" buffer. I am now wondering how I can
show the name (which is stored in the metadata) for each stream in the
playlist buffer.

I would like to do this because I usually listen to audio streams
using EMMS and having a custom name for each stream would make the
playlist buffer more readable than having the URL.

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