[yandex video][yandex efir] fixed extractor

Fixed extractor for Yandex Video and Yandex Efir(single program and program on channel).
Latest version of Yandex Video and Yandex Efir not support request for external json. Now json data with video information used as a parameter in methods of Yandex stream player at webpage.
Current extractor find call of Yandex stream player, parse parameters and find information about program.

youtube_dl/extractor/yandexvideo.py

@@ -7,17 +7,20 @@ from ..utils import (
     int_or_none,
     url_or_none,
 )
+import re
+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 +55,46 @@ 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'])