;;; emms-volume-amixer.el --- a mode for changing volume using amixer

;; Copyright (C) 2006 Free Software Foundation, Inc.

;; Author: Martin Schoenmakers <aiviru@diamond-age.net>

;; 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.
;;
;; GNU Emacs 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 file defines a few simple functions to raise or lower the volume
;; using amixer. It can be used stand-alone, though it's meant for usage
;; with EMMS, particularly with emms-volume.el

;;; History:

;; May 30 2006: First cleanup and collation of amixer functions into a
;;              separate file for releasability.

;;; Todo:

;; There probably needs to be more configurability, which may in turn
;; mean adding some more functions.
;; Some of this could benefit from adding customize interfaces.

;;; Code:

(defun emms-volume-amixer-sset-master (var)
  "Change amixer master volume by VAR."
  (start-process "mixer" nil "amixer" "sset" "Master" var))

(defun emms-volume-amixer-raise ()
  "Increase volume by 2%."
  (interactive)
  (emms-volume-amixer-sset-master "2%+"))

(defun emms-volume-amixer-lower ()
  "Decrease volume by 2%."
  (interactive)
  (emms-volume-amixer-sset-master "2%-"))

(provide 'emms-volume-amixer)

;;; emms-volume-amixer.el ends here