Get and set Flac file tags

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+;;; emms-info-metaflac.el --- Info-method for EMMS using metaflac
+
+;; Copyright (C) 2006  Free Software Foundation, Inc.
+
+;; Author: Matthew Kennedy <mkennedy@gentoo.org>
+;; Keywords:
+
+;; This file 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 2, or (at your option)
+;; any later version.
+
+;; This file 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 GNU Emacs; see the file COPYING. If not, write to the
+;; Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+;; Boston, MA 02110-1301 USA
+
+;;; Commentary:
+
+;; This code has been adapted from code found in emms-info-mp3info.el
+;; written by Ulrik Jensen <terryp@daimi.au.dk> which contains the
+;; following attribution:
+
+;; 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-metaflac)
+;; (add-to-list 'emms-info-methods-list 'emms-info-metaflac)
+
+;;; Code:
+
+(eval-when-compile (require 'cl))
+(require 'emms-info)
+
+(defvar emms-info-metaflac-version "0.1 $Revision: 1.10 $"
+  "EMMS info metaflac version string.")
+
+;; $Id: emms-info-mp3info.el,v 1.10 2005/08/12 18:01:16 xwl Exp $
+
+(defgroup emms-info-metaflac nil
+  "An EMMS-info method for getting/setting FLAC tags, using the
+external metaflac program"
+  :group 'emms-info)
+
+(defcustom emms-info-metaflac-program-name "metaflac"
+  "*The name/path of the metaflac program."
+  :type 'string
+  :group 'emms-info-metaflac)
+
+(defcustom emms-info-metaflac-options
+  '("--no-utf8-convert"
+    "--show-tag=TITLE"
+    "--show-tag=ARTIST"
+    "--show-tag=ALBUM"
+    "--show-tag=NOTE"
+    "--show-tag=YEAR"
+    "--show-tag=TRACKNUMBER"
+    "--show-tag=GENRE")
+  "The argument to pass to `emms-info-metaflac-program-name'."
+  :type '(repeat string)
+  :group 'emms-info-metaflac)
+
+(defun emms-info-metaflac (track)
+  "Get the FLAC tag of file TRACK, using `emms-info-metaflac-program'
+and return an emms-info structure representing it."
+  (when (and (eq 'file (emms-track-type track))
+             (string-match "\\.\\(flac\\|FLAC\\)\\'" (emms-track-name track)))
+    (with-temp-buffer
+      (when (zerop
+             (apply 'call-process
+              emms-info-metaflac-program-name
+              nil t nil
+              "--show-total-samples"
+              "--show-sample-rate"
+              (append emms-info-metaflac-options
+                      (list (emms-track-name track)))))
+        (goto-char (point-min))
+        (emms-track-set track 'info-playing-time
+                        (/ (string-to-number (buffer-substring (point) (line-end-position)))
+                           (progn
+                             (forward-line 1)
+                             (string-to-number (buffer-substring (point) (line-end-position))))))
+        (forward-line 1)
+        (while (looking-at "^\\([^=\n]+\\)=\\(.*\\)$")
+          (let ((name (intern (concat "info-" (downcase (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-metaflac)
+
+;;; emms-info-metaflac.el ends here