[fd/hls] Support `hls_media_playlist_data` format field (#12322)

Authored by: bashonly

yt_dlp/YoutubeDL.py

@@ -598,7 +598,7 @@ class YoutubeDL:
         # NB: Keep in sync with the docstring of extractor/common.py
         'url', 'manifest_url', 'manifest_stream_number', 'ext', 'format', 'format_id', 'format_note',
         'width', 'height', 'aspect_ratio', 'resolution', 'dynamic_range', 'tbr', 'abr', 'acodec', 'asr', 'audio_channels',
-        'vbr', 'fps', 'vcodec', 'container', 'filesize', 'filesize_approx', 'rows', 'columns',
+        'vbr', 'fps', 'vcodec', 'container', 'filesize', 'filesize_approx', 'rows', 'columns', 'hls_media_playlist_data',
         'player_url', 'protocol', 'fragment_base_url', 'fragments', 'is_from_start', 'is_dash_periods', 'request_data',
         'preference', 'language', 'language_preference', 'quality', 'source_preference', 'cookies',
         'http_headers', 'stretched_ratio', 'no_resume', 'has_drm', 'extra_param_to_segment_url', 'extra_param_to_key_url',

yt_dlp/downloader/hls.py

@@ -72,11 +72,15 @@ class HlsFD(FragmentFD):
 
     def real_download(self, filename, info_dict):
         man_url = info_dict['url']
-        self.to_screen(f'[{self.FD_NAME}] Downloading m3u8 manifest')
 
-        urlh = self.ydl.urlopen(self._prepare_url(info_dict, man_url))
-        man_url = urlh.url
-        s = urlh.read().decode('utf-8', 'ignore')
+        s = info_dict.get('hls_media_playlist_data')
+        if s:
+            self.to_screen(f'[{self.FD_NAME}] Using m3u8 manifest from extracted info')
+        else:
+            self.to_screen(f'[{self.FD_NAME}] Downloading m3u8 manifest')
+            urlh = self.ydl.urlopen(self._prepare_url(info_dict, man_url))
+            man_url = urlh.url
+            s = urlh.read().decode('utf-8', 'ignore')
 
         can_download, message = self.can_download(s, info_dict, self.params.get('allow_unplayable_formats')), None
         if can_download:

yt_dlp/extractor/common.py

@@ -201,6 +201,11 @@ class InfoExtractor:
                                             fragment_base_url
                                  * "duration" (optional, int or float)
                                  * "filesize" (optional, int)
+                    * hls_media_playlist_data
+                                 The M3U8 media playlist data as a string.
+                                 Only use if the data must be modified during extraction and
+                                 the native HLS downloader should bypass requesting the URL.
+                                 Does not apply if ffmpeg is used as external downloader
                     * is_from_start  Is a live format that can be downloaded
                                 from the start. Boolean
                     * preference Order number of this format. If this field is