fixed extract for Yandex Efir

fixed extract for Yandex Efir(single program and program on channel).
Yandex Efir not support request for json. Now json data used as a parameter in Yandex stream player.
Current extractor find call of Yandex stream player, parse parameters and find information about program.

youtube_dl/extractor/yandexvideo.py

@@ -7,17 +7,19 @@ from ..utils import (
     int_or_none,
     url_or_none,
 )
+import json
 
 
 class YandexVideoIE(InfoExtractor):
     _VALID_URL = r'''(?x)
                     https?://
                         (?:
-                            yandex\.ru(?:/portal/(?:video|efir))?/?\?.*?stream_id=|
+                            yandex\.ru(?:/portal/(?:video|efir)|/efir|/video)?/?\?.*?(stream_id=|stream_channel=)|
                             frontend\.vh\.yandex\.ru/player/
                         )
-                        (?P<id>[\da-f]+)
+                        (?P<id>[\d\w]+)
                     '''
+
     _TESTS = [{
         'url': 'https://yandex.ru/portal/video?stream_id=4dbb262b4fe5cf15a215de4f34eee34d',
         'md5': '33955d7ae052f15853dc41f35f17581c',
@@ -52,17 +54,47 @@ class YandexVideoIE(InfoExtractor):
         # DASH with DRM
         'url': 'https://yandex.ru/portal/video?from=morda&stream_id=485a92d94518d73a9d0ff778e13505f8',
         'only_matching': True,
+    }, {
+       # Efir for program
+        'url': 'https://yandex.ru/efir?stream_id=vMmiz2NPPDFE&from_block=player_context_menu_yavideo',
+        'only_matching': True,
+    }, {
+        # efir for channel
+        'url': 'https://yandex.ru/efir?stream_channel=1335',
+        'only_matching': True,
     }]
 
+    def split_params(self, txt: str) -> []:
+        braket = 0
+        line = ''
+        items = []
+        for c in txt:
+            if c == '{':
+                braket += 1
+            elif c == '}':
+                braket -= 1
+            if c == ',' and braket == 0:
+                items.append(line)
+                line = ''
+            else:
+                line += c
+        if line != '':
+            items.append(line)
+        return items
+
+
     def _real_extract(self, url):
         video_id = self._match_id(url)
 
-        content = self._download_json(
-            'https://frontend.vh.yandex.ru/v22/player/%s.json' % video_id,
-            video_id, query={
-                'stream_options': 'hires',
-                'disable_trackings': 1,
-            })['content']
+        html = self._download_webpage(url, video_id)
+
+        # search call of Yandex stream player
+        func_params = self._search_regex(r'\s*Ya\.streamModules\.player\.play\(\s*([\w\W\\R\"]*)\,\s*true\);\s*',
+                                         html, 'Yandex player', flags=re.DOTALL | re.MULTILINE)
+        params = self.split_params(func_params)
+        json_text = params[1]
+        content = json.loads(json_text)
+        content = content.get('program')
 
         content_url = url_or_none(content.get('content_url')) or url_or_none(
             content['streams'][0]['url'])