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+;;; emms-info-libtag.el --- Info-method for EMMS using libtag
+
+;; Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008,
+;;   2009 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-to-list '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)
+  :group 'emms-info-libtag)
+
+(defcustom emms-info-libtag-known-extensions
+  (regexp-opt '("mp3" "mp4" "m4a" "ogg" "flac" "spx" "wma"))
+  "Regexp of known extensions compatible with `emms-info-libtag-program-name'.
+
+Case is irrelevant."
+  :type '(string)
+  :group 'emms-info-libtag)
+
+(defun emms-info-libtag (track)
+  (when (and (eq 'file (emms-track-type 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