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+;;; emms-info-exiftool.el --- info-method for EMMS using exiftool  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2020  Free Software Foundation, Inc.
+
+;; Author: Yoni Rabkin (yrk@gnu.org)
+;; 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:
+
+;; (setq emms-info-functions '(emms-info-exiftool))
+
+;; To use this you would need to have exiftool installed on your
+;; system.
+
+
+;;; Code:
+
+(require 'emms-info)
+(require 'json)
+
+
+(defgroup emms-info-exiftool nil
+  "Options for EMMS."
+  :group 'emms-info)
+
+(defvar emms-info-exiftool-field-map
+  '((info-album        . Album)
+    (info-artist       . Artist)
+    (info-title        . Title)
+    (info-tracknumber  . TrackNumber)
+    (info-composer     . Composer)
+    (info-year         . Year)
+    (info-discnumber   . Discnumber)
+    (info-genre        . Genre)
+    (info-note         . Comment)
+    (info-playing-time . Duration)
+    (info-albumartist  . Albumartist))
+  "Mapping for exiftool output.")
+
+
+;; should only be called inside a buffer containing the json output of
+;; exiftool
+(defun emms-info-exiftool-time ()
+  "Convert from exiftool-time to seconds."
+  (save-excursion
+    (goto-char (point-min))
+    (if (re-search-forward "duration.+\\([0-9]+\\):\\([0-9]+\\):\\([0-9]+\\)"
+			   (point-max) t)
+	(let ((hours   (string-to-number (match-string-no-properties 1)))
+	      (minutes (string-to-number (match-string-no-properties 2)))
+	      (seconds (string-to-number (match-string-no-properties 3))))
+	  (+ (* hours 60 60)
+	     (* minutes 60)
+	     seconds))
+      0)))
+
+(defun emms-info-exiftool (track)
+  "Set TRACK info using exiftool."
+  (when (eq (emms-track-type track) 'file)
+    (with-temp-buffer
+      (when (zerop
+	     (let ((coding-system-for-read 'utf-8))
+	       (call-process "exiftool" nil '(t nil) nil
+			     "-json" (emms-track-name track))))
+	(goto-char (point-min))
+	(condition-case nil
+	    (let ((json-fields (elt (json-read) 0)))
+	      (mapc
+	       (lambda (field-map)
+		 (let ((emms-field (car field-map))
+		       (exiftool-field (cdr field-map)))
+		   (let ((track-field (assoc exiftool-field json-fields)))
+		     (when track-field
+		       (emms-track-set
+			track
+			emms-field
+			(cond ((eq emms-field 'info-playing-time)
+			       (emms-info-exiftool-time))
+			      (t (cdr track-field))))))))
+	       emms-info-exiftool-field-map))
+	  (error (message "error while reading track info")))
+	track))))
+
+
+(provide 'emms-info-exiftool)
+
+;;; emms-info-exiftool.el ends here