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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
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