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;;; emms-volume-mixerctl.el --- a mode for changing volume using mixerctl
;; Copyright (C) 2006, 2007, 2008, 2009, 2019 Free Software Foundation, Inc.
;; Authors: Martin Schoenmakers <aiviru@diamond-age.net>
;; Bruno Félix Rezende Ribeiro <oitofelix@gnu.org>
;; 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 St, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Commentary:
;; This file defines a few simple functions to raise or lower the volume
;; using mixerctl. It can be used stand-alone, though it's meant for usage
;; with EMMS, particularly with emms-volume.el
;;; History:
;; Jul 06 2019: Based on emms-volume-amixer.el by Martin Schoenmakers
;;; 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-mixerctl-control "master"
"The control to change the volume with.
Controls includes \"master\", \"mono\", etc. For a full list of available
controls, run `mixerctl -a' in a shell."
:type '(choice (const :tag "master" "master")
(const :tag "mono" "mono")
(string :tag "Something else: "))
:group 'emms-volume)
(defcustom emms-volume-mixerctl-card 0
"The card number to change volume.
The card is identified by a number. For a full list run `ls
/dev/mixer?*' in a shell."
:type 'integer
:group 'emms-volume)
;;;###autoload
(defun emms-volume-mixerctl-change (amount)
"Change mixerctl master volume by AMOUNT."
(message "Playback channels: %s"
(with-temp-buffer
(when (zerop
(call-process "mixerctl" nil (current-buffer) nil
"-f"
(format "/dev/mixer%d" emms-volume-mixerctl-card)
(let ((amount-str
(format "%s%d" (if (< amount 0) "-" "+")
(abs amount))))
(format "outputs.%s=%s,%s"
emms-volume-mixerctl-control
amount-str amount-str))))
(if (and (forward-line -1)
(re-search-forward "^\\(.*\\):.*->.*,\\(.*\\)$" nil t))
(format "%s -> %s" (match-string 1) (match-string 2)))))))
(provide 'emms-volume-mixerctl)
;;; emms-volume-mixerctl.el ends here
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