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+;;; emacsconf-subed.el --- Utilities for working with subtitle files -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2021 Sacha Chua
+
+;; Author: Sacha Chua <sacha@sachachua.com>
+;; Keywords: multimedia
+
+;; 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:
+
+;; You will need the subed package, which is available from NonGNU
+;; ELPA. For creating new caption files with
+;; emacsconf-subed-find-captions, you will also need compile-media.el
+;; from https://github.com/sachac/compile-media .
+
+;;; Code:
+
+(require 'subed)
+
+(defcustom emacsconf-subed-subtitle-max-length 50
+ "Target number of characters."
+ :group 'emacsconf
+ :type 'integer)
+
+(defcustom emacsconf-subed-subtitle-minimum-duration-ms 600
+ "Minimum length in milliseconds."
+ :group 'emacsconf
+ :type 'integer)
+
+
+(defun emacsconf-subed-fix-timestamps ()
+ "Change overlapping timestamps to the start of the next subtitle."
+ (interactive)
+ (goto-char (point-max))
+ (let ((timestamp (subed-subtitle-msecs-start)))
+ (while (subed-backward-subtitle-time-start)
+ (when (> (subed-subtitle-msecs-stop) timestamp)
+ (subed-set-subtitle-time-stop timestamp))
+ (setq timestamp (subed-subtitle-msecs-start)))))
+
+(defun emacsconf-subed-mark-chapter (chapter-name)
+ (interactive "MChapter: ")
+ (let ((start (subed-subtitle-msecs-start)))
+ (save-excursion
+ (when (and (subed-backward-subtitle-time-stop)
+ (= (subed-subtitle-msecs-stop) start))
+ (subed-set-subtitle-time-stop (1- start))))
+ (with-current-buffer (find-file-noselect
+ (if (string-match "--main" (buffer-file-name))
+ (replace-match "--chapters" nil t (buffer-file-name))
+ (concat (file-name-sans-extension (buffer-file-name)) "--chapters.vtt")))
+ (goto-char (point-max))
+ (if (bobp)
+ (insert "WEBVTT\n\n"
+ (subed-make-subtitle nil start nil chapter-name))
+ (insert "\n" (subed-make-subtitle nil start nil chapter-name)))
+ (when (subed-backward-subtitle-time-stop)
+ (subed-set-subtitle-time-stop (1- start)))
+ (save-buffer))))
+
+(defun emacsconf-subed-convert-transcript-to-directives (id &optional chapters)
+ (interactive (read-string "ID: " "mainVideo"))
+ (goto-char (point-min))
+ (let* ((chapter-starts (mapcar 'car chapters))
+ (result (concat
+ "<a name=\"transcript\"></a>\n# Transcript\n\n"
+ (cl-loop while (subed-forward-subtitle-text)
+ concat (format
+ "[[!template %stext=\"%s\" start=\"%s\" video=\"%s\" id=subtitle]]\n"
+ (if (member (subed-subtitle-msecs-start) chapter-starts)
+ "new=\"1\" "
+ "")
+ (replace-regexp-in-string
+ "\n" " "
+ (replace-regexp-in-string
+ "\"" "&quot ;"
+ (replace-regexp-in-string "[][]" "" (subed-subtitle-text))))
+ (subed-vtt--msecs-to-timestamp (subed-subtitle-msecs-start))
+ id)))))
+ (when (called-interactively-p 'any)
+ (kill-new result))
+ result))
+
+(defun conf-prepare-transcript-directives ()
+ (interactive)
+ (let* ((info (emacsconf-get-talk-info-for-subtree))
+ (wiki-file (plist-get info :wiki-file-path))
+ (caption-file (expand-file-name (concat (plist-get info :video-slug) "--main.vtt")
+ conf-captions-directory))
+ (chapters (emacsconf-subed-chapters-as-list info)))
+ (with-temp-file wiki-file
+ (insert
+ (with-current-buffer (find-file-noselect caption-file)
+ (emacsconf-subed-convert-transcript-to-directives "mainVideo" chapters))))
+ (find-file wiki-file)))
+
+(defun emacsconf-subed-download-captions (&optional youtube-url video-slug)
+ (interactive (list (org-entry-get (point) "YOUTUBE_URL") (org-entry-get (point) "VIDEO_SLUG")))
+ (shell-command
+ (mapconcat
+ (lambda (f)
+ (format "youtube-dl --write-sub --write-auto-sub --no-warnings --sub-lang en --skip-download --sub-format %s %s -o %s"
+ f
+ youtube-url
+ (expand-file-name video-slug conf-captions-directory)))
+ '("vtt" "srv2")
+ ";")))
+
+(defun emacsconf-subed--copy-downloaded-captions-base (video-slug url type)
+ (let ((new-file (expand-file-name (concat video-slug "--" type ".ass") emacsconf-captions-directory)))
+ (call-process "ffmpeg" nil nil nil "-y" "-i" (emacsconf-latest-file emacsconf-download-directory "srt$")
+ new-file)
+ (emacsconf-subed-download-captions url new-file)
+ (with-current-buffer (find-file new-file)
+ (goto-char (point-min))
+ (emacsconf-subed-fix-timestamps)
+ (save-buffer))))
+
+(defun emacsconf-subed-copy-downloaded-captions ()
+ "Copy the most recently downloaded captions for this entry's main talk."
+ (interactive)
+ (emacsconf-subed--copy-downloaded-captions-base
+ (org-entry-get (point) "VIDEO_SLUG")
+ (org-entry-get (point) "YOUTUBE_URL")
+ "main"))
+
+(defun emacsconf-subed-copy-downloaded-qa-captions ()
+ "Copy the most recently downloaded captions for this entry's Q&A"
+ (interactive)
+ (emacsconf-subed--copy-downloaded-captions-base
+ (org-entry-get (point) "VIDEO_SLUG")
+ (org-entry-get (point) "QA_YOUTUBE")
+ "answers"))
+
+(defun emacsconf-subed-find-captions ()
+ "Open the caption file for this talk.
+Create it if necessary."
+ (interactive)
+ (require 'compile-media)
+ (let ((video-slug (org-entry-get (point) "VIDEO_SLUG")))
+ (find-file
+ (or (car (directory-files conf-captions-directory
+ t
+ (concat (regexp-quote video-slug)
+ "--main\\.\\(srt\\|vtt\\)")))
+ (expand-file-name (concat video-slug "--main.vtt") "captions")))
+ (when (eobp)
+ (insert "WEBVTT\n\n0:00:00.000 --> "
+ (compile-media-msecs-to-timestamp
+ (compile-media-get-file-duration-ms (subed-guess-video-file)))
+ "\n"))))
+
+(defun emacsconf-subed-check-subtitles ()
+ "Do some simple validation of subtitles."
+ (interactive)
+ (while (not (eobp))
+ (if (> (length (subed-subtitle-text)) emacsconf-subed-subtitle-max-length)
+ (error "Length %d exceeds maximum length" (length (subed-subtitle-text))))
+ (if (< (- (subed-subtitle-msecs-stop) (subed-subtitle-msecs-start)) emacsconf-subed-subtitle-minimum-duration-ms)
+ (error "Duration %d is less than minimum" (- (subed-subtitle-msecs-stop) (subed-subtitle-msecs-start))))
+ (or (subed-forward-subtitle-text) (goto-char (point-max)))))
+
+(defun emacsconf-subed-chapters-as-list (info)
+ (when (file-exists-p (expand-file-name (concat (plist-get info :video-slug) "--main--chapters.vtt")
+ conf-captions-directory))
+ (with-current-buffer (find-file-noselect (expand-file-name (concat (plist-get info :video-slug) "--main--chapters.vtt")
+ conf-captions-directory))
+ (let (result)
+ (subed-for-each-subtitle (point-min) (point-max) nil
+ (setq result
+ (cons
+ (cons (subed-subtitle-msecs-start)
+ (subed-subtitle-text))
+ result)))
+ (nreverse result)))))
+
+(defun emacsconf-subed-chapters-buffer-as-list ()
+ (let (result)
+ (subed-for-each-subtitle (point-min) (point-max) nil
+ (setq result
+ (cons
+ (list
+ :text
+ (subed-subtitle-text)
+ :start-ms
+ (subed-subtitle-msecs-start)
+ :stop-ms
+ (subed-subtitle-msecs-stop))
+ result)))
+ (nreverse result)))
+
+(defun emacsconf-subed-chapters-as-description ()
+ (interactive)
+ (let ((result
+ (mapconcat
+ (lambda (o)
+ (concat (format-seconds "%.2m:%.2s" (/ (plist-get o :start-ms) 1000))
+ " "
+ (plist-get o :text)))
+ (emacsconf-subed-chapters-buffer-as-list)
+ "\n")))
+ (when (called-interactively-p 'any)
+ (kill-new result))
+ result))
+
+(provide 'emacsconf-subed)
+;;; emacsconf-subed.el ends here
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