contrib/amixer.lisp

   1 ;;; --------------------------------------------------------------------------
   2 ;;; CLFSWM - FullScreen Window Manager
   3 ;;;
   4 ;;; --------------------------------------------------------------------------
   5 ;;; Documentation: Volume mode
   6 ;;; --------------------------------------------------------------------------
   7 ;;;
   8 ;;; (C) 2015 Desmond O. Chang <dochang@gmail.com>
   9 ;;;
  10 ;;; This program is free software; you can redistribute it and/or modify
  11 ;;; it under the terms of the GNU General Public License as published by
  12 ;;; the Free Software Foundation; either version 3 of the License, or
  13 ;;; (at your option) any later version.
  14 ;;;
  15 ;;; This program is distributed in the hope that it will be useful,
  16 ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;;; GNU General Public License for more details.
  19 ;;;
  20 ;;; You should have received a copy of the GNU General Public License
  21 ;;; along with this program; if not, write to the Free Software
  22 ;;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23 ;;;
  24 ;;; Documentation: A volume mode.
  25 ;;;   If you want to use this file, just add this line in
  26 ;;; your configuration file:
  27 ;;;
  28 ;;;   (load-contrib "volume-mode.lisp")
  29 ;;; And with the alsa mixer:
  30 ;;;   (load-contrib "amixer.lisp")
  31 ;;;
  32 ;;;  This mode is inspired by the emms volume package.  When you change the
  33 ;;;  volume in main mode or second mode, clfswm will enter volume mode and
  34 ;;;  set a timer to leave this mode.  Changing volume in volume mode will
  35 ;;;  reset the timer.  You can also leave volume mode manually by return,
  36 ;;;  escape or control-g.
  37 ;;;
  38 ;;;  Special variable *VOLUME-MODE-TIMEOUT* controls the timeout in
  39 ;;;  seconds.  If it's positive, volume mode will exit when timeout occurs;
  40 ;;;  if it's 0, volume mode will exit right now; if it's negative, volume
  41 ;;;  will not exit even if timeout occurs.  Default timeout is 3 seconds.
  42 ;;;
  43 ;;;  Volume mode uses three special variables to control the mixer:
  44 ;;;  *VOLUME-MUTE-FUNCTION*, *VOLUME-LOWER-FUNCTION* and
  45 ;;;  *VOLUME-RAISE-FUNCTION*.  Their values are functions which must accept
  46 ;;;  no arguments and return two values indicating the mixer state.  The
  47 ;;;  first value is the volume ratio whose type must be (real 0 1).  If the
  48 ;;;  mixer is mute, the second value should be true, otherwise it should be
  49 ;;;  false.  If volume controller cannot get the mixer state, it must
  50 ;;;  return NIL.
  51 ;;;
  52 ;;;  Volume mode shows a mute sign, a percentage and a ratio bar on the
  53 ;;;  screen.  A plus sign '+' means it's unmute and a minus sign '-' means
  54 ;;;  it's mute now.  If volume mode doesn't know the mixer state, a message
  55 ;;;  "unknown" will be shown.
  56 ;;;
  57 ;;;  contrib/amixer.lisp shows how to use volume mode with alsa.
  58 ;;;
  59 ;;; --------------------------------------------------------------------------
  60
  61 (in-package :clfswm)
  62
  63 (format t "Loading amixer code... ")
  64
  65 (defvar *amixer-scontrol* "Master"
  66   "Default control for amixer commands.")
  67
  68 (defun amixer-cmd (cmd scontrol &rest parameters)
  69   (let* ((sed "sed 's/^.*\\[\\([[:digit:]]\\+\\)%\\].*\\[\\(on\\|off\\)\\].*$/\\1%\\2/'")
  70          (fmt "amixer ~A ~A~{ ~A~} 2>/dev/null | tail -1 | ~A")
  71          (shell (format nil fmt cmd scontrol parameters sed))
  72          (line (read-line (do-shell shell) nil t)))
  73     (when (stringp line)
  74       (let* ((ratio (parse-integer line :junk-allowed t))
  75              (%-pos (position #\% line)))
  76         (values (and ratio (/ ratio 100))
  77                 (equal "off" (and %-pos (subseq line (1+ %-pos)))))))))
  78
  79 (defun amixer-sset (&rest parameters)
  80   (apply 'amixer-cmd "sset" *amixer-scontrol* parameters))
  81
  82 (defparameter *volume-mute-function*
  83   (lambda () (amixer-sset "toggle")))
  84
  85 (defparameter *volume-lower-function*
  86   (lambda () (amixer-sset "5%-")))
  87
  88 (defparameter *volume-raise-function*
  89   (lambda () (amixer-sset "5%+")))
  90
  91 (defun amixer-lower-1% ()
  92   "Lower 1% volume."
  93   (volume-set (lambda () (amixer-sset "1%-"))))
  94
  95 (defun amixer-raise-1% ()
  96   "Raise 1% volume."
  97   (volume-set (lambda () (amixer-sset "1%+"))))
  98
  99 (defun amixer-volume-bind ()
 100   (define-volume-key ("less") 'amixer-lower-1%)
 101   (define-volume-key ("greater") 'amixer-raise-1%)
 102   (define-second-key ("less") 'amixer-lower-1%)
 103   (define-second-key ("greater") 'amixer-raise-1%))
 104
 105 (add-hook *binding-hook* 'amixer-volume-bind)
 106
 107 (format t "done~%")