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;;; emms-volume-sndioctl.el --- a mode for changing volume using sndioctl -*- lexical-binding: t; -*-
;; Copyright (C) 2006, 2007, 2008, 2009, 2019 Free Software Foundation, Inc.
;; Authors: Omar Polo <op@omarpolo.com>
;; 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 sndioctl. It can be used stand-alone, though it's
;; meant for usage with EMMS, particularly with emms-volume.el
;;; History:
;; Sep 09 2021: Based on emms-volume-mixerctl.el by Omar Polo
;;; Code:
(require 'subr-x)
(defcustom emms-volume-sndioctl-stream "output"
"The stream to change the volume with.
Usually it's the global \"output\". For a full list of available
controls, run `sndioctl' in a shell."
:type '(choice (const :tag "output" "output")
(string :tag "Something else: "))
:group 'emms-volume)
(defcustom emms-volume-sndioctl-device nil
"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 '(choice (const :tag "none" nil)
(string :tag "Device: "))
:group 'emms-volume)
;;;###autoload
(defun emms-volume-sndioctl-change (amount)
"Change sndioctl level by AMOUNT."
(message "Playback channels: %s"
(with-temp-buffer
(when (zerop
(apply #'call-process
"sndioctl" nil (current-buffer) nil
`("-n"
,@(when emms-volume-sndioctl-device
`("-f" ,emms-volume-sndioctl-device))
,(format "%s.level=%s%f"
emms-volume-sndioctl-stream
(if (> amount 0) "+" "")
(/ (float amount) 100)))))
(string-trim-right (buffer-string))))))
(provide 'emms-volume-sndioctl)
;;; emms-volume-sndioctl.el ends here
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