blob: 0cef8172db658a3f8a2c1590bdf507b0ebbfb566 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
;;; 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))
(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 "%s/%s.%s" dir 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
|
