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;;; my-spc.el -- handling spc files -*- lexical-binding: t -*-
;; Copyright (C) 2023 Free Software Foundation.
;; Author: Yuchen Pei <id@ypei.org>
;; Warren Wilkinson <warrenwilkinson@gmail.com>
;; Maintainer: Yuchen Pei <id@ypei.org>
;; Package-Requires: ((emacs "28"))
;; This file is part of dotted.
;; dotted 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.
;; dotted 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 dotted. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; handling spc files.
;;; Code:
(require 'bindat)
(defconst my-spc--id666-magic-array
[#x53 #x4e #x45 #x53 #x2d #x53 #x50#x43 #x37 #x30 #x30 #x20 #x53 #x6f #x75 #x6e #x64 #x20 #x46 #x69 #x6c #x65 #x20 #x44 #x61 #x74 #x61 #x20 #x76 #x30 #x2e #x33 #x30]
"id666 header magic pattern `SNES-SPC700 Sound File Data v0.30'")
(defconst my-spc--id666-header-bindat-spec
'((file-identifier vec 33)
(eval (unless (equal last my-spc--id666-magic-array)
(error "id666 framing mismatch: expected `%s', got `%s'"
my-spc--id666-magic-array
last)))
(unused u16)
(has-id666 u8)
(revision u8)
(pc-reg u16)
(a-reg u8)
(x-reg u8)
(y-reg u8)
(psw-reg u8)
(sp-reg u8)
(res-reg u16)
(song-title strz 32)
(game-title strz 32)
(dumper strz 16)
(comment strz 32)
(date strz 11)
(fadeout vec 3)
(fadeout-length vec 5)
(artist strz 32))
"id666 header specification.
Sources:
- URL `https://ocremix.org/info/SPC_Format_Specification'
- URL `https://picard-docs.musicbrainz.org/en/appendices/tag_mapping.html'")
(defun my-spc--decode-id666-header (filename)
"Read and decode id666 header from FILENAME."
(with-temp-buffer
(set-buffer-multibyte nil)
(insert-file-contents-literally filename nil 0 210)
(bindat-unpack my-spc--id666-header-bindat-spec
(buffer-string))))
(defun my-spc-decode-id666 (filename)
"Read and decode id666 metadata from FILENAME.
Return metadata in a list of (FIELD . VALUE) cons cells, or nil
in case of errors or if there were no known fields in FILENAME."
(condition-case nil
(let ((header (my-spc--decode-id666-header filename)))
(when (= 26 (bindat-get-field header 'has-id666))
`(
(title . ,(bindat-get-field header 'song-title))
(album . ,(bindat-get-field header 'game-title))
(artist . ,(bindat-get-field header 'artist))
(comment . ,(bindat-get-field header 'comment))
(dumper . ,(bindat-get-field header 'dumper))
(date . ,(bindat-get-field header 'date))
(fadeout . ,(bindat-get-field header 'fadeout))
(fadeout-length . ,(bindat-get-field header 'fadeout))
(extension . ,(file-name-extension filename))
(number . ,(replace-regexp-in-string
"[^-]+-" ""
(file-name-base filename)))
)))
(error nil)))
(defun my-spc-format-file-name (file)
"Format a filename from an spc FILE.
artist/album/title (note).extension"
(when-let* ((metadata (my-spc-decode-id666 file))
(artist (alist-get 'artist metadata))
(album (alist-get 'album metadata))
(title (alist-get 'title metadata))
(extension (alist-get 'extension metadata))
(number (alist-get 'number metadata)))
(if (or (string-empty-p artist)
(string-empty-p album)
(string-empty-p title)
(string-empty-p extension)
(string-empty-p number))
nil
(format "%s/%s/%s %s.%s" artist album number title extension))))
(defun my-spc-file-rename (dir)
"Rename all spc files under DIR using dired."
(let ((pairs
(seq-filter
'cdr
(mapcar
(lambda (file)
(cons (expand-file-name file)
(format "%s/%s"
(expand-file-name my-audio-incoming-dir)
(my-spc-format-file-name file))))
(directory-files-recursively dir "\\`.*\\.spc\\'")))))
(when (y-or-n-p
(print
(format
"Will do the following renaming: %s\nContinue?"
(string-join
(mapcar (lambda (pair)
(format "%s -> %s" (car pair) (cdr pair)))
pairs)
"\n"))))
(mapc
(lambda (pair)
(dired-rename-file (car pair) (cdr pair) t))
pairs))))
(provide 'my-spc)
;;; my-spc.el ends here
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