| 1 | ;;; emms-volume-sndioctl.el --- a mode for changing volume using sndioctl -*- lexical-binding: t; -*- |
| 2 | |
| 3 | ;; Copyright (C) 2006, 2007, 2008, 2009, 2019 Free Software Foundation, Inc. |
| 4 | |
| 5 | ;; Authors: Omar Polo <op@omarpolo.com> |
| 6 | |
| 7 | ;; This file is part of EMMS. |
| 8 | |
| 9 | ;; EMMS is free software; you can redistribute it and/or modify |
| 10 | ;; it under the terms of the GNU General Public License as published by |
| 11 | ;; the Free Software Foundation; either version 3, or (at your option) |
| 12 | ;; any later version. |
| 13 | ;; |
| 14 | ;; EMMS is distributed in the hope that it will be useful, |
| 15 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | ;; GNU General Public License for more details. |
| 18 | ;; |
| 19 | ;; You should have received a copy of the GNU General Public License |
| 20 | ;; along with EMMS; see the file COPYING. If not, write to the |
| 21 | ;; Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, |
| 22 | ;; Boston, MA 02110-1301, USA. |
| 23 | |
| 24 | ;;; Commentary: |
| 25 | |
| 26 | ;; This file defines a few simple functions to raise or lower the |
| 27 | ;; volume using sndioctl. It can be used stand-alone, though it's |
| 28 | ;; meant for usage with EMMS, particularly with emms-volume.el |
| 29 | |
| 30 | ;;; History: |
| 31 | |
| 32 | ;; Sep 09 2021: Based on emms-volume-mixerctl.el by Omar Polo |
| 33 | |
| 34 | ;;; Code: |
| 35 | (require 'subr-x) |
| 36 | |
| 37 | (defcustom emms-volume-sndioctl-stream "output" |
| 38 | "The stream to change the volume with. |
| 39 | Usually it's the global \"output\". For a full list of available |
| 40 | controls, run `sndioctl' in a shell." |
| 41 | :type '(choice (const :tag "output" "output") |
| 42 | (string :tag "Something else: ")) |
| 43 | :group 'emms-volume) |
| 44 | |
| 45 | (defcustom emms-volume-sndioctl-device nil |
| 46 | "The card number to change volume. |
| 47 | The card is identified by a number. For a full list run `ls |
| 48 | /dev/mixer?*' in a shell." |
| 49 | :type '(choice (const :tag "none" nil) |
| 50 | (string :tag "Device: ")) |
| 51 | :group 'emms-volume) |
| 52 | |
| 53 | ;;;###autoload |
| 54 | (defun emms-volume-sndioctl-change (amount) |
| 55 | "Change sndioctl level by AMOUNT." |
| 56 | (message "Playback channels: %s" |
| 57 | (with-temp-buffer |
| 58 | (when (zerop |
| 59 | (apply #'call-process |
| 60 | "sndioctl" nil (current-buffer) nil |
| 61 | `("-n" |
| 62 | ,@(when emms-volume-sndioctl-device |
| 63 | `("-f" ,emms-volume-sndioctl-device)) |
| 64 | ,(format "%s.level=%s%f" |
| 65 | emms-volume-sndioctl-stream |
| 66 | (if (> amount 0) "+" "") |
| 67 | (/ (float amount) 100))))) |
| 68 | (string-trim-right (buffer-string)))))) |
| 69 | |
| 70 | (provide 'emms-volume-sndioctl) |
| 71 | |
| 72 | ;;; emms-volume-sndioctl.el ends here |