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;;; emacsconf-stream.el --- Play files and update streaming information -*- lexical-binding: t; -*-
;; Copyright (C) 2022 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:
;;
;;; Code:
(defvar emacsconf-stream-dir "/data/emacsconf/stream/"
"Directory where the stream versions are.
Files should be in YEAR/video-slug--main.webm and video-slug--main.vtt.")
(defvar emacsconf-stream-host "res.emacsconf.org")
(defun emacsconf-stream-track-login (track)
"Return user@host for the track."
(when (plist-get track :track)
(setq track (emacsconf-get-track (plist-get track :track))))
(or (plist-get track :tramp)
(concat "/ssh:" emacsconf-id "-" (plist-get track :id) "@" emacsconf-stream-host)))
(defvar emacsconf-stream-bottom-limit 80
"Number of characters for bottom text.")
(defun emacsconf-stream-set-news (track message)
(interactive (list (emacsconf-complete-track) (read-string "Message: ")))
(let* ((home (concat (emacsconf-stream-track-login track) "~"))
(filename (expand-file-name "news.txt" home)))
(with-temp-file filename
(insert message))))
(defun emacsconf-stream-broadcast (message)
(interactive (list (read-string "Message: ")))
(mapc (lambda (track) (emacsconf-stream-set-news track message))
emacsconf-tracks))
(defun emacsconf-stream-clear-talk-info (track)
(interactive (list (emacsconf-complete-track)))
(emacsconf-stream-set-talk-info-from-strings track "" ""))
(defun emacsconf-stream-clear-track (track)
(interactive (list (emacsconf-complete-track)))
(emacsconf-stream-set-talk-info-from-strings track "" "")
(emacsconf-stream-set-news track ""))
(defun emacsconf-stream-clear-all ()
(interactive)
(mapc #'emacsconf-stream-clear-track emacsconf-tracks))
(defun emacsconf-stream-svg-set-text (dom id text)
"Update DOM to set the tspan in the element with ID to TEXT.
If the element doesn't have a tspan child, use the element itself."
(setq text (svg--encode-text text))
(let ((node (or (dom-child-by-tag
(car (dom-by-id dom id))
'tspan)
(dom-by-id dom id))))
(cond
((null node)) ; skip
((= (length node) 2)
(nconc node (list text)))
(t (setf (elt node 2) text)))))
(defun emacsconf-stream-add-talk-props (talk)
"Create an overlay for TALK.
VIDEO-FILENAME will be displayed while the video is playing,
while OTHER-FILENAME will be displayed at other times."
(plist-put
talk
:overlay-url
(concat (replace-regexp-in-string "^.*//" "" emacsconf-base-url)
(plist-get talk :url)
(cond
((null (plist-get talk :q-and-a)) "")
((string-match "live" (plist-get talk :q-and-a))
" - Q&A: live (see talk page for URL)")
((and (string-match "irc" (plist-get talk :q-and-a))
(plist-get talk :irc))
(format " - Q&A: IRC (#%s) - speaker nick: %s"
(plist-get (emacsconf-get-track (plist-get talk :track)) :channel)
(plist-get talk :irc)))
((string-match "irc" (plist-get talk :q-and-a))
(format " - Q&A: IRC (#%s)"
(plist-get (emacsconf-get-track (plist-get talk :track)) :channel)))
(t ""))))
(plist-put talk :overlay-bottom (or (plist-get talk :speakers-with-pronouns) "EmacsConf"))
talk)
(defun emacsconf-stream-set-talk-info-from-strings (track url bottom)
(interactive (list (emacsconf-complete-track) (read-string "URL: ") (read-string "Bottom: ")))
(let* ((home (concat (emacsconf-stream-track-login track) "~"))
(default-directory home)
(filename
(if (file-exists-p (expand-file-name "roles/obs/overlay.svg" emacsconf-ansible-directory))
(expand-file-name "roles/obs/overlay.svg" emacsconf-ansible-directory)
(expand-file-name "other.svg" home)))
(dom (xml-parse-file filename)))
(emacsconf-stream-svg-set-text dom "bottom" bottom)
(emacsconf-stream-svg-set-text dom "url" url)
(with-temp-file filename (dom-print dom))
(with-temp-file (expand-file-name "video.svg" home)
(let ((node (dom-by-id dom "bottom")))
(when node
(dom-set-attribute node 'style "visibility: hidden")
(dom-set-attribute (dom-child-by-tag node 'tspan) 'style "fill: none; stroke: none")))
(dom-print dom))
;; OBS doesn't kern SVG text as prettily as Inkscape does, so we use Inkscape for the conversion
(shell-command "inkscape --export-type=png --export-dpi=96 --export-background-opacity=0 video.svg")
(shell-command "inkscape --export-type=png --export-dpi=96 --export-background-opacity=0 other.svg")))
(defun emacsconf-stream-set-talk-info (talk)
(interactive (list (emacsconf-complete-talk-info)))
(setq talk (emacsconf-stream-add-talk-props talk))
(let ((home (concat (emacsconf-stream-track-login (emacsconf-get-track talk)) "~")))
(if (file-exists-p
(expand-file-name (concat (plist-get talk :slug) "-video.png") emacsconf-stream-overlay-dir))
(progn
(copy-file
(expand-file-name (concat (plist-get talk :slug) "-video.png") emacsconf-stream-overlay-dir)
(expand-file-name "video.png" home)
t)
(copy-file
(expand-file-name (concat (plist-get talk :slug) "-other.png") emacsconf-stream-overlay-dir)
(expand-file-name "other.png" home)
t))
(emacsconf-stream-set-talk-info-from-strings
(emacsconf-get-track talk)
(plist-get talk :overlay-url)
(plist-get talk :overlay-bottom)))))
(defun emacsconf-stream-update-talk-info-org-after-todo-state-change ()
"Update talk info."
(when (string= org-state "PLAYING")
(emacsconf-stream-set-talk-info (emacsconf-get-talk-info-for-subtree))))
(defun emacsconf-stream-play-talk-org-after-todo-state-change ()
"Play the talk."
(when (string= org-state "PLAYING")
(emacsconf-stream-play-video (emacsconf-get-talk-info-for-subtree))))
(defun emacsconf-stream-get-filename (talk)
"Return the local filename for the video file for TALK.
Final files should be stored in /data/emacsconf/stream/YEAR/video-slug--main.webm."
(expand-file-name
(concat (plist-get talk :video-slug) "--main.webm")
(expand-file-name emacsconf-year
emacsconf-stream-dir)))
(defun emacsconf-stream-play-video (talk)
(interactive (list (emacsconf-complete-talk-info)))
(let ((default-directory (emacsconf-stream-track-login talk)))
(shell-command
(concat "~/bin/track-mpv "
(shell-quote-argument (emacsconf-stream-get-filename talk))))))
(defun emacsconf-stream-write-talk-overlay-svgs (talk video-filename other-filename)
(setq talk (emacsconf-stream-add-talk-props talk))
(let ((dom (xml-parse-file (expand-file-name "roles/obs/overlay.svg" emacsconf-ansible-directory)))
(default-directory (file-name-directory video-filename)))
(emacsconf-stream-svg-set-text dom "bottom" (plist-get talk :overlay-bottom))
(emacsconf-stream-svg-set-text dom "url" (plist-get talk :overlay-url))
(with-temp-file other-filename (dom-print dom))
(with-temp-file video-filename
(let ((node (dom-by-id dom "bottom")))
(when node
(dom-set-attribute node 'style "visibility: hidden")
(dom-set-attribute (dom-child-by-tag node 'tspan) 'style "fill: none; stroke: none")))
(dom-print dom))
(shell-command
(concat "inkscape --export-type=png --export-dpi=96 --export-background-opacity=0 "
(shell-quote-argument (file-name-nondirectory video-filename))))
(shell-command
(concat "inkscape --export-type=png --export-dpi=96 --export-background-opacity=0 "
(shell-quote-argument (file-name-nondirectory other-filename))))))
(defvar emacsconf-stream-overlay-dir "/data/emacsconf/overlays/")
(defun emacsconf-stream-generate-overlays (&optional info)
(interactive)
(setq info (emacsconf-filter-talks (or info (emacsconf-get-talk-info))))
(unless (file-directory-p emacsconf-stream-overlay-dir)
(make-directory emacsconf-stream-overlay-dir))
(mapc (lambda (talk)
(emacsconf-stream-write-talk-overlay-svgs
talk
(expand-file-name (concat (plist-get talk :slug) "-video.svg") emacsconf-stream-overlay-dir)
(expand-file-name (concat (plist-get talk :slug) "-other.svg") emacsconf-stream-overlay-dir)))
info))
(provide 'emacsconf-stream)
;;; emacsconf-stream.el ends here
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