[ie/niconico:live] Fix extractor (#13045)

Authored by: doe1080

yt_dlp/extractor/niconico.py

@@ -16,6 +16,7 @@
     determine_ext,
     float_or_none,
     int_or_none,
+    parse_bitrate,
     parse_duration,
     parse_iso8601,
     parse_qs,
@@ -23,7 +24,6 @@
     qualities,
     remove_start,
     str_or_none,
-    try_get,
     unescapeHTML,
     unified_timestamp,
     update_url_query,
@@ -785,8 +785,6 @@ class NiconicoLiveIE(NiconicoBaseIE):
         'only_matching': True,
     }]
 
-    _KNOWN_LATENCY = ('high', 'low')
-
     def _real_extract(self, url):
         video_id = self._match_id(url)
         webpage, urlh = self._download_webpage_handle(f'https://live.nicovideo.jp/watch/{video_id}', video_id)
@@ -802,22 +800,19 @@ def _real_extract(self, url):
         })
 
         hostname = remove_start(urllib.parse.urlparse(urlh.url).hostname, 'sp.')
-        latency = try_get(self._configuration_arg('latency'), lambda x: x[0])
-        if latency not in self._KNOWN_LATENCY:
-            latency = 'high'
 
         ws = self._request_webpage(
             Request(ws_url, headers={'Origin': f'https://{hostname}'}),
             video_id=video_id, note='Connecting to WebSocket server')
 
-        self.write_debug('[debug] Sending HLS server request')
+        self.write_debug('Sending HLS server request')
         ws.send(json.dumps({
             'type': 'startWatching',
             'data': {
                 'stream': {
                     'quality': 'abr',
-                    'protocol': 'hls+fmp4',
-                    'latency': latency,
+                    'protocol': 'hls',
+                    'latency': 'high',
                     'accessRightMethod': 'single_cookie',
                     'chasePlay': False,
                 },
@@ -881,18 +876,29 @@ def _real_extract(self, url):
         for cookie in cookies:
             self._set_cookie(
                 cookie['domain'], cookie['name'], cookie['value'],
-                expire_time=unified_timestamp(cookie['expires']), path=cookie['path'], secure=cookie['secure'])
+                expire_time=unified_timestamp(cookie.get('expires')), path=cookie['path'], secure=cookie['secure'])
+
+        fmt_common = {
+            'live_latency': 'high',
+            'origin': hostname,
+            'protocol': 'niconico_live',
+            'video_id': video_id,
+            'ws': ws,
+        }
+        q_iter = (q for q in qualities[1:] if not q.startswith('audio_'))  # ignore initial 'abr'
+        a_map = {96: 'audio_low', 192: 'audio_high'}
 
         formats = self._extract_m3u8_formats(m3u8_url, video_id, ext='mp4', live=True)
-        for fmt, q in zip(formats, reversed(qualities[1:])):
-            fmt.update({
-                'format_id': q,
-                'protocol': 'niconico_live',
-                'ws': ws,
-                'video_id': video_id,
-                'live_latency': latency,
-                'origin': hostname,
-            })
+        for fmt in formats:
+            if fmt.get('acodec') == 'none':
+                fmt['format_id'] = next(q_iter, fmt['format_id'])
+            elif fmt.get('vcodec') == 'none':
+                abr = parse_bitrate(fmt['url'].lower())
+                fmt.update({
+                    'abr': abr,
+                    'format_id': a_map.get(abr, fmt['format_id']),
+                })
+            fmt.update(fmt_common)
 
         return {
             'id': video_id,