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;;; emms-volume-amixer.el --- a mode for changing volume using amixer
;; Copyright (C) 2006, 2007 Free Software Foundation, Inc.
;; Author: Martin Schoenmakers <aiviru@diamond-age.net>
;; 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 2, 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 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:
(defcustom emms-volume-amixer-control "Master"
"The control to change the volume with.
Controls includes \"Master\", \"PCM\", etc. For a full list of available
controls, run `amixer controls' in a shell."
:type '(choice (const :tag "Master" "Master")
(const :tag "PCM" "PCM")
(string :tag "Something else: "))
:group 'emms-volume)
(defun emms-volume-amixer-change (amount)
"Change amixer master volume by AMOUNT."
(message "Playback channels: %s"
(with-temp-buffer
(when (zerop
(call-process "amixer" nil (current-buffer) nil
"sset" emms-volume-amixer-control
(format "%d%%%s" (abs amount)
(if (< amount 0) "-" "+"))))
(if (re-search-backward "\\[\\([0-9]+%\\)\\]" nil t)
(match-string 1))))))
(provide 'emms-volume-amixer)
;;; emms-volume-amixer.el ends here
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