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-;;; emms-volume-amixer.el --- a mode for changing volume using amixer -*- lexical-binding: t; -*-
-
-;; Copyright (C) 2006, 2007, 2008, 2009, 2023 Free Software Foundation, Inc.
-
-;; Author: Martin Schoenmakers <[email protected]>
-
-;; 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 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.
-
-
-;;; 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)
-
-(defcustom emms-volume-amixer-card 0
- "The card number to change volume.
-The card is identified by a number. For a full list run `cat
-/proc/asound/cards' in a shell."
- :type 'integer
- :group 'emms-volume)
-
-(defvar emms-volume-amixer-volume-regexp
- "\\[\\([0-9]+\\)%\\]"
- "Regexp to capture the volume from amixer output.")
-
-;;;###autoload
-(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
- "-c"
- (format "%d" emms-volume-amixer-card)
- "sset" emms-volume-amixer-control
- (format "%d%%%s" (abs amount)
- (if (< amount 0) "-" "+"))))
- (if (re-search-backward emms-volume-amixer-volume-regexp nil t)
- (match-string 1))))))
-
-(defun emms-volume-amixer-get ()
- "Return the amixer volume.
-
-Number is limited to the range [0-100]."
- (let ((v (with-temp-buffer
- (when (zerop
- (call-process "amixer" nil (current-buffer) nil
- "-c"
- (format "%d" emms-volume-amixer-card)
- "sget" emms-volume-amixer-control))
- (if (re-search-backward
- emms-volume-amixer-volume-regexp nil t)
- (match-string 1)
- nil)))))
- (if v
- (max (min (string-to-number v) 100) 0)
- (error "could not get volume from amixer backend"))))
-
-
-
-(provide 'emms-volume-amixer)
-
-;;; emms-volume-amixer.el ends here