* lisp/emms-volume-mixerctl.el: new file

Thanks to Bruno Félix Rezende Ribeiro; new contributor (assignment
papers sent as of writing.)

1 files changed, 80 insertions, 0 deletions

diff --git a/lisp/emms-volume-mixerctl.el b/lisp/emms-volume-mixerctl.el
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+;;; emms-volume-mixerctl.el --- a mode for changing volume using mixerctl
+
+;; Copyright (C) 2006, 2007, 2008, 2009, 2019 Free Software Foundation, Inc.
+
+;; Authors: Martin Schoenmakers <aiviru@diamond-age.net>
+;;          Bruno Félix Rezende Ribeiro <oitofelix@gnu.org>
+
+;; 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 mixerctl. It can be used stand-alone, though it's meant for usage
+;; with EMMS, particularly with emms-volume.el
+
+;;; History:
+
+;; Jul 06 2019: Based on emms-volume-amixer.el by Martin Schoenmakers
+
+;;; 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:
+
+(defcustom emms-volume-mixerctl-control "master"
+  "The control to change the volume with.
+Controls includes \"master\", \"mono\", etc. For a full list of available
+controls, run `mixerctl -a' in a shell."
+  :type '(choice (const :tag "master" "master")
+                 (const :tag "mono" "mono")
+                 (string :tag "Something else: "))
+  :group 'emms-volume)
+
+(defcustom emms-volume-mixerctl-card 0
+  "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 'integer
+  :group 'emms-volume)
+
+;;;###autoload
+(defun emms-volume-mixerctl-change (amount)
+  "Change mixerctl master volume by AMOUNT."
+  (message "Playback channels: %s"
+           (with-temp-buffer
+             (when (zerop
+                    (call-process "mixerctl" nil (current-buffer) nil
+				  "-f"
+				  (format "/dev/mixer%d" emms-volume-mixerctl-card)
+				  (let ((amount-str
+					 (format "%s%d" (if (< amount 0) "-" "+")
+						 (abs amount))))
+                                    (format "outputs.%s=%s,%s"
+					    emms-volume-mixerctl-control
+					    amount-str amount-str))))
+               (if (and (forward-line -1)
+			(re-search-forward "^\\(.*\\):.*->.*,\\(.*\\)$" nil t))
+                   (format "%s -> %s" (match-string 1) (match-string 2)))))))
+
+(provide 'emms-volume-mixerctl)
+
+;;; emms-volume-mixerctl.el ends here