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;;; emms-volume.el --- Volume functions and a minor mode to adjust volume easily
;; Copyright (C) 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
;; Author: 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 provides generally two things:
;; Generic volume setting functions and some appropriate bindings for EMMS
;; playlist buffers. These can also be bound to global keys,however, the
;; second part may be more useful for this. This part provides functions
;; meant to be bound to a global key (the author uses C-c e + and C-c e -),
;; which then temporarily activates a minor mode allowing you to change the
;; volume with just + and -. This mode deactivates a short (configurable)
;; amount of time after the last volume change. This allows for easier volume
;; adjustment without getting in the way.
;;; History:
;; May 2006: First stab at writing the minor mode.
;;
;; 30 May 2006: Cleanup and restructuring to fit with EMMS.
;;; Todo:
;; Some of this could benefit from adding customize interfaces.
;;; Code:
(require 'emms)
(require 'emms-playlist-mode)
(require 'emms-volume-amixer)
(require 'emms-volume-pulse)
(require 'emms-volume-mixerctl)
;; Customize group
(defgroup emms-volume nil
"Volume setting for EMMS."
:group 'emms)
;; General volume setting related code.
(defcustom emms-volume-change-function
(cond
((executable-find "amixer") 'emms-volume-amixer-change)
((executable-find "pactl") 'emms-volume-pulse-change)
((executable-find "mixerctl") emms-volume-mixerctl-change)
(t #'(lambda (amount) (user-error "%s" "No supported mixer found. Please, define ‘emms-volume-change-function’."))))
"*The function to use to change the volume.
If you have your own functions for changing volume, set this."
:type '(choice (const :tag "Amixer" emms-volume-amixer-change)
(const :tag "MPD" emms-volume-mpd-change)
(const :tag "PulseAudio" emms-volume-pulse-change)
(const :tag "Mixerctl" emms-volume-mixerctl-change)
(function :tag "Lisp function"))
:group 'emms-volume)
(defcustom emms-volume-change-amount 2
"The amount to use when raising or lowering the volume using the
emms-volume interface.
This should be a positive integer."
:type 'integer
:group 'emms-volume)
;;;###autoload
(defun emms-volume-raise ()
"Raise the speaker volume."
(interactive)
(funcall emms-volume-change-function emms-volume-change-amount))
;;;###autoload
(defun emms-volume-lower ()
"Lower the speaker volume."
(interactive)
(funcall emms-volume-change-function (- emms-volume-change-amount)))
(define-key emms-playlist-mode-map (kbd "+") 'emms-volume-raise)
(define-key emms-playlist-mode-map (kbd "-") 'emms-volume-lower)
;; Code specific to the minor mode.
(define-minor-mode emms-volume-minor-mode
"Allows volume setting with + and - after an initial key combo."
:global t
:init-value nil
:lighter " (+/-)"
:keymap '(("+" . emms-volume-mode-plus)
("-" . emms-volume-mode-minus)))
(defvar emms-volume-mode-timeout 2
"*The timeout in amount of seconds used by `emms-volume-minor-mode'.")
(defvar emms-volume-mode-timer nil
"The timer `emms-volume-minor-mode' uses.")
;;;###autoload
(defun emms-volume-mode-plus ()
"Raise volume and enable or extend the `emms-volume-minor-mode' timeout."
(interactive)
(emms-volume-raise)
(emms-volume-mode-start-or-extend))
;;;###autoload
(defun emms-volume-mode-minus ()
"Lower volume and enable or extend the `emms-volume-minor-mode' timeout."
(interactive)
(emms-volume-lower)
(emms-volume-mode-start-or-extend))
(defun emms-volume-mode-disable-timer ()
"Disable `emms-volume-minor-mode' timer."
(cancel-timer emms-volume-mode-timer)
(setq emms-volume-mode-timer nil))
(defun emms-volume-mode-set-timer ()
"Set a new `emms-volume-minor-mode' timer."
(when emms-volume-mode-timer
(emms-volume-mode-disable-timer))
(setq emms-volume-mode-timer (run-at-time emms-volume-mode-timeout
nil
'emms-volume-mode-timer-timeout)))
(defun emms-volume-mode-timer-timeout ()
"Function to disable `emms-volume-minor-mode' at timeout."
(setq emms-volume-mode-timer nil)
(emms-volume-minor-mode -1))
(defun emms-volume-mode-start-or-extend ()
"Start `emms-volume-minor-mode' or extend its running time."
(when (null emms-volume-minor-mode)
(emms-volume-minor-mode 1))
(emms-volume-mode-set-timer))
(provide 'emms-volume)
;;; emms-volume.el ends here
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