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;;; my-media-segment.el -- Media segmentation utility -*- lexical-binding: t -*-
;; Copyright (C) 2023 Free Software Foundation.
;; Author: Yuchen Pei <id@ypei.org>
;; Package-Requires: ((emacs "28.2"))
;; This file is part of dotfiles.
;; dotfiles is free software: you can redistribute it and/or modify it under
;; the terms of the GNU Affero General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; dotfiles 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 Affero General
;; Public License for more details.
;; You should have received a copy of the GNU Affero General Public
;; License along with dotfiles. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Media segmentation utility.
;;; Code:
;;; A utility using ffmpeg to cut a media file into smaller ones, from a
;;; description of the timestamps.
(defvar my-media-segment-queued-jobs nil)
(defvar my-media-segment-max-inflight 3)
(defun my-media-segment-enqueue-process (start-process-function)
"Enqueue a process that can started by applying 'start-process'.
The process can be started by applying 'start-process' on START-PROCESS-ARGS."
;; somehow only this version works, but not nconc or setq with append
;; the problem with the other two is that the operation gets stuck after the
;; initial 'my-media-segment-max-inflight' operations.
(add-to-list 'my-media-segment-queued-jobs start-process-function)
;; (nconc my-media-segment-queued-jobs (list start-process-function))
;; (setq my-media-segment-queued-jobs
;; (append my-media-segment-queued-jobs (list start-process-function)))
)
(defun my-media-segment-dequeue-process ()
(when my-media-segment-queued-jobs
(funcall (pop my-media-segment-queued-jobs))))
(defun my-segment-media-file-1 (media-file-name desc-file-name)
"Run ffmpeg asynchronously to segment file-name according to description.
Uses `my-media-segment-max-inflight' to limit number of inflight tasks."
(interactive (list
(read-file-name "Choose media file: ")
(read-file-name "Choose description file: ")))
(let* ((dir (file-name-sans-extension (expand-file-name media-file-name)))
(info (my-get-media-segments
(with-temp-buffer
(insert-file-contents desc-file-name)
(buffer-string))))
(total (length info))
(pad (1+ (floor (log10 total))))
(idx 0)
(thunk))
(dolist (media info)
(setq idx (1+ idx))
(ignore-errors (dired-create-directory dir))
(let* ((title (plist-get media :title))
(start (plist-get media :start))
(end (plist-get media :end))
(args (append (list "-ss" start)
(when end (list "-to" end))
(list "-i" (expand-file-name media-file-name)
(format
(format "%%s/%%0%dd-%%s.%%s" pad) dir idx title
(file-name-extension media-file-name))))))
(setq thunk
(lambda ()
(message "Cutting %s-%s to %s (%d/%d)..."
start (or end "") title idx total)
(set-process-sentinel
(apply 'start-process
(append (list (format "ffmpeg-%s" title)
(format "*ffmpeg-%s*" title)
"ffmpeg")
args))
(lambda (_ _)
(my-media-segment-dequeue-process)))))
(if (<= idx my-media-segment-max-inflight)
(funcall thunk)
(my-media-segment-enqueue-process thunk))))))
(defun my-get-media-segments (description)
"Output title start end triplets."
(let ((results) (title) (start) (end))
(with-temp-buffer
(erase-buffer)
(insert description)
(goto-char (point-min))
(save-excursion
(while (re-search-forward
"\\(\\(?:[0-9]+:\\)?[0-9]+:[0-9]\\{2\\}\\)\\(?:[[:space:]]*-[[:space:]]*\\(\\(?:[0-9]+:\\)?[0-9]+:[0-9]\\{2\\}\\)\\)?"
nil t)
(setq start (match-string-no-properties 1)
end (match-string-no-properties 2))
(replace-match "")
(beginning-of-line 1)
(setq title (replace-regexp-in-string
"^[[:punct:][:space:]]*" ""
(replace-regexp-in-string
"[[:punct:][:space:]]*$" ""
(buffer-substring-no-properties
(point)
(progn (beginning-of-line 2) (point))))))
(push (list :title (my-make-filename title) :start start :end end) results)
)
(setq end nil)
(dolist (result results)
(unless (plist-get result :end)
(plist-put result :end end)
(setq end (plist-get result :start))))
(reverse results))
)))
(defvar my-segment-media-max-async 10)
(defun my-segment-media-file (media-file-name desc-file-name synchronously)
"Run ffmpeg asynchronously to segment file-name according to description.
With a prefix-arg, run synchronously."
(interactive (list
(read-file-name "Choose media file: ")
(read-file-name "Choose description file: ")
current-prefix-arg))
(let* ((dir (file-name-sans-extension (expand-file-name media-file-name)))
(info (my-get-media-segments
(with-temp-buffer
(insert-file-contents desc-file-name)
(buffer-string))))
(total (length info))
(idx 0))
(when (or synchronously (<= total my-segment-media-max-async)
(let ((choice
(car
(read-multiple-choice
(format
"Recognised many (%d) segments, continue asynchronously?"
total)
'((?y "yes")
(?s "synchronously instead")
(?n "cancel"))))))
(cond ((eq choice ?y) t)
((eq choice ?s) (setq synchronously t))
(t nil))))
(dolist (media info)
(setq idx (1+ idx))
(ignore-errors (dired-create-directory dir))
(let* ((title (plist-get media :title))
(start (plist-get media :start))
(end (plist-get media :end))
(args (append (list "-ss" start)
(when end (list "-to" end))
(list "-i" (expand-file-name media-file-name)
(format "%s/%s.%s" dir title
(file-name-extension media-file-name))))))
(message "Cutting %s-%s to %s (%d/%d)..."
start (or end "") title idx total)
(if synchronously
(apply 'call-process
(append (list "ffmpeg" nil "*ffmpeg*" t) args))
(apply 'start-process
(append (list (format "ffmpeg-%s" title)
(format "*ffmpeg-%s*" title)
"ffmpeg")
args)))))
(when synchronously
(message "All %d segments splitted into %s"
(length info) dir)))))
(provide 'my-media-segment)
;;; my-media-segment.el ends here
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