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;;; emms-info-libtag.el --- Info-method for EMMS using libtag -*- lexical-binding: t; -*-
;; Copyright (C) 2003-2021 Free Software Foundation, Inc.
;; Authors: Ulrik Jensen <terryp@daimi.au.dk>
;; Jorgen Schäfer <forcer@forcix.cx>
;; Keywords:
;; 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, 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, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Commentary:
;; This code has been adapted from code found in mp3player.el, written
;; by Jean-Philippe Theberge (jphiltheberge@videotron.ca), Mario
;; Domgoergen (kanaldrache@gmx.de) and Jorgen Schäfer
;; <forcer@forcix.cx>
;; To activate this method for getting info, use something like:
;; (require 'emms-info-libtag)
;; (add-hook 'emms-info-functions 'emms-info-libtag)
;; 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 libtag as your exclusive info
;; provider:
;; (setq emms-info-functions '(emms-info-libtag))
;; You may have to compile the program from source.
;; Make sure that you have libtag installed.
;; In the EMMS source directory do
;;
;; make emms-print-metadata
;;
;; and copy src/emms-print-metadata to your PATH.
;; If compilation fails and libtag is installed, you may have to
;; change the line
;;
;; #include <tag_c.h>
;;
;; to the correction location, e.g.
;;
;; #include <taglib/tag_c.h>
;;; Code:
(require 'emms-info)
(defgroup emms-info-libtag nil
"Options for EMMS."
:group 'emms-info)
(defvar emms-info-libtag-coding-system 'utf-8)
(defcustom emms-info-libtag-program-name "emms-print-metadata"
"Name of emms-info-libtag program."
:type '(string))
(defcustom emms-info-libtag-known-extensions
(regexp-opt '("mp3" "mp4" "m4a" "ogg" "flac" "spx" "wma" "opus"))
"Regexp of known extensions compatible with `emms-info-libtag-program-name'.
Case is irrelevant."
:type '(string))
(defun emms-info-libtag (track)
(when (and (emms-track-file-p track)
(let ((case-fold-search t))
(string-match
emms-info-libtag-known-extensions
(emms-track-name track))))
(with-temp-buffer
(when (zerop
(let ((coding-system-for-read 'utf-8))
(call-process emms-info-libtag-program-name
nil '(t nil) nil
(emms-track-name track))))
(goto-char (point-min))
;; Crush the trailing whitespace
(while (re-search-forward "[[:space:]]+$" nil t)
(replace-match "" nil nil))
(goto-char (point-min))
(while (looking-at "^\\([^=\n]+\\)=\\(.*\\)$")
(let ((name (intern-soft (match-string 1)))
(value (match-string 2)))
(when (> (length value)
0)
(emms-track-set track
name
(if (eq name 'info-playing-time)
(string-to-number value)
value))))
(forward-line 1))))))
(provide 'emms-info-libtag)
;;; emms-info-libtag.el ends here
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