[extractor/wordpress:playlist] Add generic embed extractor (#5012)

Fixes https://github.com/yt-dlp/yt-dlp/issues/4955

Authored by: coletdjnz

yt_dlp/extractor/_extractors.py

@@ -2146,6 +2146,7 @@
     WistiaPlaylistIE,
     WistiaChannelIE,
 )
+from .wordpress import WordpressPlaylistEmbedIE
 from .worldstarhiphop import WorldStarHipHopIE
 from .wppilot import (
     WPPilotIE,

yt_dlp/extractor/wordpress.py

+from .common import InfoExtractor
+from ..utils import (
+    get_elements_by_class,
+    int_or_none,
+    parse_duration,
+    traverse_obj,
+)
+
+
+# https://codex.wordpress.org/Playlist_Shortcode
+class WordpressPlaylistEmbedIE(InfoExtractor):
+    _VALID_URL = False
+    IE_NAME = 'wordpress:playlist'
+    _WEBPAGE_TESTS = [{
+        # 5 WordPress playlists. This is using wpse-playlist, which is similar.
+        # See: https://github.com/birgire/wpse-playlist
+        'url': 'https://xlino.com/wordpress-playlist-shortcode-with-external-audio-or-video-files/',
+        'info_dict': {
+            'id': 'wordpress-playlist-shortcode-with-external-audio-or-video-files',
+            'title': 'WordPress: Playlist shortcode with external audio or video files – Birgir Erlendsson (birgire)',
+            'age_limit': 0,
+        },
+        'playlist_count': 5,
+    }, {
+        'url': 'https://pianoadventures.com/products/piano-adventures-level-1-lesson-book-enhanced-cd/',
+        'info_dict': {
+            'id': 'piano-adventures-level-1-lesson-book-enhanced-cd-wp-playlist-1',
+            'title': 'Wordpress Playlist',
+            'thumbnail': 'https://pianoadventures.com/wp-content/uploads/sites/13/2022/01/CD1002cover.jpg',
+            'age_limit': 0,
+        },
+        'playlist': [{
+            'info_dict': {
+                'id': 'CD1002-21',
+                'ext': 'mp3',
+                'title': '21 Half-Time Show',
+                'thumbnail': 'https://pianoadventures.com/wp-content/plugins/media-library-assistant/images/crystal/audio.png',
+                'album': 'Piano Adventures Level 1 Lesson Book (2nd Edition)',
+                'genre': 'Classical',
+                'duration': 49.0,
+                'artist': 'Nancy and Randall Faber',
+                'description': 'md5:a9f8e9aeabbd2912bc13cc0fab1a4ce8',
+            }
+        }],
+        'playlist_count': 6,
+        'params': {'skip_download': True}
+    }]
+
+    def _extract_from_webpage(self, url, webpage):
+        # class should always be "wp-playlist-script"
+        # See: https://core.trac.wordpress.org/browser/trunk/src/wp-includes/media.php#L2930
+        for i, j in enumerate(get_elements_by_class('wp-playlist-script', webpage)):
+            playlist_json = self._parse_json(j, self._generic_id(url), fatal=False, ignore_extra=True, errnote='') or {}
+            if not playlist_json:
+                continue
+            entries = [{
+                'id': self._generic_id(track['src']),
+                'title': track.get('title'),
+                'url': track.get('src'),
+                'thumbnail': traverse_obj(track, ('thumb', 'src')),
+                'album': traverse_obj(track, ('meta', 'album')),
+                'artist': traverse_obj(track, ('meta', 'artist')),
+                'genre': traverse_obj(track, ('meta', 'genre')),
+                'duration': parse_duration(traverse_obj(track, ('meta', 'length_formatted'))),
+                'description': track.get('description'),
+                'height': int_or_none(traverse_obj(track, ('dimensions', 'original', 'height'))),
+                'width': int_or_none(traverse_obj(track, ('dimensions', 'original', 'width'))),
+            } for track in traverse_obj(playlist_json, ('tracks', ...), expected_type=dict)]
+            yield self.playlist_result(entries, self._generic_id(url) + f'-wp-playlist-{i+1}', 'Wordpress Playlist')