* emms-volume-sndioctl.el: new file

A mode for changing volume using sndioctl on OpenBSD.

1 files changed, 71 insertions, 0 deletions

diff --git a/emms-volume-sndioctl.el b/emms-volume-sndioctl.el
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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:
+
+(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