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+;;; emms-info-opusinfo.el --- Emms information from Ogg Opus files.
+
+;; Copyright (C) 2018 Free Software Foundation, Inc.
+
+;; Author: Pierre Neidhardt <mail@ambrevar.xyz>
+
+;; This file is part of EMMS.
+
+;; 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; if not, write to the Free Software Foundation,
+;; Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
+
+;;; Commentary:
+;;
+
+;;; Code:
+
+(require 'emms-info)
+
+(defgroup emms-info-opusinfo nil
+  "An EMMS-info method for getting, using the external opusinfo
+program"
+  :group 'emms-info)
+
+(defcustom emms-info-opusinfo-coding-system 'utf-8
+  "*Coding system used in the output of opusinfo."
+  :type 'coding-system
+  :group 'emms-info-opusinfo)
+
+(defcustom emms-info-opusinfo-program-name "opusinfo"
+  "*The name/path of the opusinfo tag program."
+  :type 'string
+  :group 'emms-info-opusinfo)
+
+(defun emms-info-opusinfo (track)
+  "Add track information to TRACK.
+This is a useful element for `emms-info-functions'."
+  (when (and (eq 'file (emms-track-type track))
+             (or (string-match "\\.[Oo][Gg][Gg]\\'" (emms-track-name track))
+                 (string-match "\\.[Oo][Pp][Uu][Ss]\\'" (emms-track-name track))))
+
+    (with-temp-buffer
+      (call-process emms-info-opusinfo-program-name
+                    nil t nil (emms-track-name track))
+
+      ;; play time
+      (goto-char (point-min))
+      (when (re-search-forward
+             "Playback length: \\([0-9]*\\)m:\\([0-9]*\\)" nil t)
+        (let* ((minutes (string-to-number (match-string 1)))
+               (seconds (string-to-number (match-string 2)))
+               (ptime-total (+ (* minutes 60) seconds))
+               (ptime-min minutes)
+               (ptime-sec seconds))
+          (emms-track-set track 'info-playing-time ptime-total)
+          (emms-track-set track 'info-playing-time-min ptime-min)
+          (emms-track-set track 'info-playing-time-sec ptime-sec)
+          (emms-track-set track 'info-file (emms-track-name track))))
+
+      ;; all the rest of the info available
+      (goto-char (point-min))
+      (when (re-search-forward "^.*\\.\\.\\.$" (point-max) t)
+        (while (zerop (forward-line 1))
+          (when (looking-at "^\t\\(.*?\\)=\\(.*\\)$") ; recognize the first '='
+            (let ((a (match-string 1))
+                  (b (match-string 2)))
+              (when (and (< 0 (length a))
+                         (< 0 (length b)))
+                (emms-track-set track
+                                (intern (downcase (concat "info-" (match-string 1))))
+                                (match-string 2))))))))))
+
+(provide 'emms-info-opusinfo)
+
+;;; emms-info-opusinfo.el ends here