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+;;; emms-info-ytdl.el --- info-method for EMMS using ytdl  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2020  Free Software Foundation, Inc.
+
+;; Author: Yuchen Pei (ycp@gnu.org)
+;; Keywords: multimedia
+
+;; EMMS 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.
+
+;; EMMS 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 EMMS; see the file COPYING..  If not, see
+;; <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; (add-to-list emms-info-functions 'emms-info-ytdl)
+
+;; To use this you would need to have `emms-info-ytdl-command`
+;; (typically youtube-dl or yt-dlp) installed on your system.
+
+
+;;; Code:
+
+(require 'emms-info)
+(require 'json)
+
+
+(defgroup emms-info-ytdl nil
+  "Options for EMMS."
+  :group 'emms-info)
+
+(defvar emms-info-ytdl-field-map
+  '((info-title        . title)
+    (info-artist       . artist)
+    (info-playing-time . duration))
+  "Mapping for ytdl output.")
+
+(defvar emms-info-ytdl-regexp
+  "^https?://"
+  "Regexp to use ytdl to get info.")
+
+(defvar emms-info-ytdl-exclude-regexp
+  "\\(\\.\\w+$\\|/playlist\\|/channel\\)"
+  "Regexp not to use ytdl to get info.")
+
+(defvar emms-info-ytdl-command
+	"youtube-dl"
+	"Command to run for emms-info-ytdl.")
+
+(defun emms-info-ytdl (track)
+  "Set TRACK info using ytdl."
+  (when (and (eq (emms-track-type track) 'url)
+						 (string-match emms-info-ytdl-regexp (emms-track-name track))
+						 (not
+							(string-match emms-info-ytdl-exclude-regexp
+														(emms-track-name track))))
+    (with-temp-buffer
+      (when (zerop
+						 (let ((coding-system-for-read 'utf-8))
+							 (call-process emms-info-ytdl-command nil '(t nil) nil
+														 "-j" (emms-track-name track))))
+				(goto-char (point-min))
+				(condition-case nil
+						(let ((json-fields (json-read)))
+							(mapc
+							 (lambda (field-map)
+								 (let ((emms-field (car field-map))
+											 (ytdl-field (cdr field-map)))
+									 (let ((track-field (assoc ytdl-field json-fields)))
+										 (when track-field
+											 (emms-track-set
+												track
+												emms-field
+												(if (eq emms-field 'info-playing-time)
+														(truncate (cdr track-field))
+													(cdr track-field)))))))
+							 emms-info-ytdl-field-map))
+					(error (message "error while reading track info")))
+				track))))
+
+(provide 'emms-info-ytdl)
+
+;;; emms-info-ytdl.el ends here