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;;; emms-volume-pulse.el --- a mode for changing volume using PulseAudio pactl -*- lexical-binding: t; -*-
;; Copyright (C) 2015 Free Software Foundation, Inc.
;; Author: Rasmus Pank Roulund <emacs@pank.eu>
;; 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 pactl. It can be used stand-alone, though it's meant for usage
;; with EMMS, particularly with emms-volume.el.
;;
;; To use add the following to your EMMS configuration
;; (setq emms-volume-change-function 'emms-volume-pulse-change)
;;; History:
;; Marts 2015: First release. Partly based on emms-volume-amixer.el
;;; 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:
(require 'cl-lib)
;; TODO: it would be great if custom could have
;; choices based on pactl list short sinks | cut -f1-2
(defcustom emms-volume-pulse-sink 0
"The sink to use for volume adjustment.
See full list of devices on your system by running
pactl list short sinks"
:type '(choice (number :tag "Sink number")
(string :tag "Sink symbolic name"))
:group 'emms-volume)
(defcustom emms-volume-pulse-max-volume 100
"The maximum volume percentage."
:type 'integer
:group 'emms-volume)
(defun emms-volume--pulse-get-volume ()
"Return `emms-volume-pulse-sink' volume."
(let ((sink-number-p (numberp emms-volume-pulse-sink))
(output
(shell-command-to-string
(concat "pactl list sinks" "|"
"grep -E -e 'Sink' -e 'Name' -e '^[^a-zA-Z]*Volume'"))))
(string-to-number
(car
(reverse
(funcall
(if sink-number-p 'assq 'assoc)
emms-volume-pulse-sink
(mapcar (if sink-number-p 'identity 'cdr)
(cl-loop while
(string-match
(mapconcat 'identity
'(".*Sink[ \t]+\\#\\([0-9]+\\)"
".*Name:[ \t]\\([^\n]+\\)"
".*Volume:.*?\\([0-9]+\\)%.*\n?")
"\n")
output)
collect (list (string-to-number (match-string 1 output))
(match-string 2 output)
(match-string 3 output))
do (setq output (replace-match "" nil nil output))))))))))
;;;###autoload
(defun emms-volume-pulse-change (amount)
"Change PulseAudio volume by AMOUNT."
(message "Volume is %s%%"
(let ((pactl (or (executable-find "pactl")
(error "pactl is not in PATH")))
(next-vol (max (min (+ (emms-volume--pulse-get-volume) amount)
emms-volume-pulse-max-volume)
0)))
(when (zerop (shell-command
(format "%s set-sink-volume %s %s%%"
pactl emms-volume-pulse-sink next-vol)))
next-vol))))
(provide 'emms-volume-pulse)
;;; emms-volume-pulse.el ends here
|
