Added setting volume via PulseAudio.

Possible to set volume via PulseAudio pactl via emms-volume-pulse.el.

Patch by Rasmus Pank Roulund <emacs@pank.eu>.

1 files changed, 113 insertions, 0 deletions

diff --git a/lisp/emms-volume-pulse.el b/lisp/emms-volume-pulse.el
new file mode 100644
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+++ b/lisp/emms-volume-pulse.el
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+;;; emms-volume-pulse.el --- a mode for changing volume using PulseAudio pactl
+
+;; Copyright (C) 2015 Free Software Foundation, Inc.
+
+;; Author: Rasmus Pank Roulund <emacs@pank.eu>
+
+;; 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 pactl. It can be used stand-alone, though it's meant for usage
+;; with EMMS, particularly with emms-volume.el.
+;;
+;; To use add the following to your EMMS configuration
+;;     (setq emms-volume-change-function 'emms-volume-pulse-change)
+
+;;; History:
+
+;; Marts 2015: First release.  Partly based on emms-volume-amixer.el
+
+;;; 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:
+
+(eval-when-compile (require 'cl))
+
+;; TODO: it would be great if custom could have
+;; choices based on pactl list short sinks | cut -f1-2
+
+(defcustom emms-volume-pulse-sink 0
+  "The sink to use for volume adjustment.
+
+See full list of devices on your system by running
+    pactl list short sinks"
+  :type '(choice (number :tag "Sink number")
+                 (string :tag "Sink symbolic name"))
+  :group 'emms-volume)
+
+(defcustom emms-volume-pulse-max-volume 150
+  "The sink to use for volume adjustment.
+
+See full list of devices on your system by running
+    pactl list short sinks"
+  :type '(choice (number :tag "Sink number")
+                 (string :tag "Sink symbolic name"))
+  :group 'emms-volume)
+
+
+(defun emms-volume--pulse-get-volume ()
+  "Return `emms-volume-pulse-sink' volume."
+  (let ((sink-number-p (numberp emms-volume-pulse-sink))
+        (start 0)
+        (output
+         (shell-command-to-string
+          (concat "pactl list sinks" "|"
+                  "grep -E -e 'Sink' -e 'Name' -e  '^[^a-zA-Z]*Volume'"))))
+    (string-to-number
+     (car
+      (reverse
+       (funcall
+        (if sink-number-p 'assq 'assoc)
+        emms-volume-pulse-sink
+        (mapcar (if sink-number-p 'identity 'cdr)
+                (loop while
+                      (string-match
+                       (mapconcat 'identity
+                                  '(".*Sink[ \t]+\\#\\([0-9]\\)"
+                                    ".*Name:[ \t]\\([^\n]+\\)"
+                                    ".*Volume:.*?\\([0-9]+\\)%.*\n?")
+                                  "\n")
+                       output)
+                      collect (list (string-to-number (match-string 1 output))
+                                    (match-string 2 output)
+                                    (match-string 3 output))
+                      do (setq output (replace-match "" nil nil output))))))))))
+
+
+;;;###autoload
+(defun emms-volume-pulse-change (amount)
+  "Change amixer master volume by AMOUNT."
+  (message "Volume is %s%%"
+           (let ((pactl (or (executable-find "pactl")
+                            (error "pactl is not in PATH")))
+                 (next-vol (min (+ (emms-volume--pulse-get-volume) amount)
+                                emms-volume-pulse-max-volume)))
+             (when (zerop (shell-command
+                           (format "%s set-sink-volume %s %s%%"
+                                   pactl emms-volume-pulse-sink next-vol)))
+               next-vol))))
+
+(provide 'emms-volume-pulse)
+
+;;; emms-volume-pulse.el ends here