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;;; emms-info-tinytag.el --- Info-method for EMMS using tinytag -*- lexical-binding: t; -*-
;; Copyright (C) 2020 Free Software Foundation, Inc.
;; Author: Fran Burstall <fran.burstall@gmail.com>
;; Keywords: multimedia
;; EMMS is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; EMMS is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with EMMS; see the file COPYING.. If not, see
;; <https://www.gnu.org/licenses/>.
;;; Commentary:
;; This code has been adapted from code found in emms-info-libtag.el,
;; written by Ulrik Jensen <terryp@daimi.au.dk> and Jorgen Schäfer
;; <forcer@forcix.cx>.
;; To activate this method for getting info, use:
;; (require 'emms-info-tinytag)
;; (add-to-list 'emms-info-functions 'emms-info-tinytag)
;; Note that you should remove emms-info-mp3info and emms-info-ogginfo
;; from the emms-info-functions list if you want to avoid
;; conflicts. For example, to set tinytag as your exclusive info
;; provider:
;; (setq emms-info-functions '(emms-info-tinytag))
;; To use this provider, you need to install the tinytag python module
;; with something like:
;; pip install tinytag
;;; Code:
(require 'emms-info)
(require 'json) ;see below
(defgroup emms-info-tinytag nil
"Options for EMMS."
:group 'emms-info)
(defvar emms-info-tinytag-coding-system 'utf-8) ;is this used anywhere?
(defcustom emms-info-tinytag-python-name "python"
"Name of python we use."
:type '(string)
:group 'emms-info-tinytag)
(defcustom emms-info-tinytag-known-extensions
(regexp-opt '("mp3" "mp4" "m4a" "m4b" "ogg" "opus" "flac" "wma" "wav"))
"Regexp of known extensions that `emms-info-tinytag' can handle.
Case is irrelevant."
:type '(string)
:group 'emms-info-tinytag)
(defvar emms-info-tinytag--info-fields
'((info-album . album)
(info-albumartist . albumartist)
(info-artist . artist)
(info-composer . composer)
(info-year . year)
(info-discnumber . disc)
(info-genre . genre)
(info-note . comment)
(info-playing-time . duration)
(info-title . title)
(info-tracknumber . track))
"An alist mapping info-* fields to tinytag fields.")
(defun emms-info-tinytag (track)
"Set tags for TRACK using tinytag."
(when (and (eq 'file (emms-track-type track))
(let ((case-fold-search t))
(string-match
emms-info-tinytag-known-extensions
(emms-track-name track))))
(with-temp-buffer
(when (zerop
(let ((coding-system-for-read 'utf-8))
(call-process emms-info-tinytag-python-name
nil '(t nil) nil
"-m" "tinytag" (emms-track-name track))))
(goto-char (point-min))
;; tinytag can output json or [ct]sv. Sadly, in the latter
;; case, null values are unhelpfully represented by the string
;; "None" so we parse the json.
(let ((track-info (json-read)))
(dolist (field emms-info-tinytag--info-fields)
(let ((name (car field))
(value (alist-get (cdr field) track-info)))
(when (and value (or (numberp value) (> (length value)
0)))
(emms-track-set track
name
(cond ((eq name 'info-playing-time)
(round value))
;; for m4a, disc or track is an int: issue raised upstream
((and (or (eq name 'info-discnumber)
(eq name 'info-tracknumber))
(numberp value))
(number-to-string value))
(t value)))))))))))
(provide 'emms-info-tinytag)
;;; emms-info-tinytag.el ends here
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