emms package

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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