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;;; org-fc-audio.el --- Audio playback during review -*- lexical-binding: t; -*-
;; Copyright (C) 2020-2021 Leon Rische
;; Author: Leon Rische <emacs@leonrische.me>
;; Url: https://www.leonrische.me/pages/org_flashcards.html
;; Package-requires: ((emacs "26.3") (org "9.3"))
;; Version: 0.1.0
;; This program 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 of the License, or
;; (at your option) any later version.
;; This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; Adds audio playback during review.
;;
;; Audio files can be played at different times:
;; - before the card is set up
;; - after the card is set up
;;
;; This distinction is relevant for text-input cards where the card
;; setup ends only after the user has entered their answer.
;;
;; The `mpv` media player needs to be installed for this to work.
;;
;;; Code:
(require 'org-fc)
(defcustom org-fc-audio-before-setup-property "FC_AUDIO_BEFORE_SETUP"
"Name of the property to use for storing before-setup audio files."
:type 'string
:group 'org-fc)
(defcustom org-fc-audio-after-setup-property "FC_AUDIO_AFTER_SETUP"
"Name of the property to use for storing after-setup audio files."
:type 'string
:group 'org-fc)
(defcustom org-fc-audio-after-flip-property "FC_AUDIO_AFTER_FLIP"
"Name of the property to use for storing after-flip audio files."
:type 'string
:group 'org-fc)
(defun org-fc-audio-set-before-setup (file)
"Set the befor-setup audio property of the current card to FILE."
(interactive "f")
(if (org-fc-entry-p)
(org-set-property org-fc-audio-before-setup-property file)))
(defun org-fc-audio-set-after-setup (file)
"Set the after-setup audio of the current card to FILE."
(interactive "f")
(if (org-fc-entry-p)
(org-set-property org-fc-audio-after-setup-property file)))
(defun org-fc-audio-set-after-flip (file)
"Set the after-setup audio of the current card to FILE."
(interactive "f")
(if (org-fc-entry-p)
(org-set-property org-fc-audio-after-flip-property file)))
(defun org-fc-audio-play (property &optional speed)
"Play the audio of the current card.
Look up the file from PROPERTY. If SPEED is non-nil, play back
the file at the given speed."
(if-let ((file (org-entry-get (point) property)))
(org-fc-audio-play-file file (or speed 1.0))))
(defun org-fc-audio-play-file (file speed)
"Play the audio FILE at SPEED."
(start-process-shell-command
"org-fc audio"
nil
(format "mpv %s --speed=%f" file speed)))
(add-hook
'org-fc-before-setup-hook
(lambda () (org-fc-audio-play org-fc-audio-before-setup-property)))
(add-hook
'org-fc-after-setup-hook
(lambda () (org-fc-audio-play org-fc-audio-after-setup-property)))
(add-hook
'org-fc-after-flip-hook
(lambda () (org-fc-audio-play org-fc-audio-after-flip-property)))
;;; Footer
(provide 'org-fc-audio)
;;; org-fc-audio.el ends here
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