Repository: yt-dlp/yt-dlp
File: yt_dlp/extractor/jiosaavn.py (Python)

Code before:
    _VALID_URL = r'''(?x)
                    https?://(?:www\.)?
                        (?:
                            jiosaavn\.com/song/[^/]+/|
                            saavn.com/s/song/(?:[^/]+/){3}
                        )
                        (?P<id>[^/]+)
                   '''
    _TESTS = [{
        'url': 'https://www.jiosaavn.com/song/leja-re/OQsEfQFVUXk',
        'md5': '7b1f70de088ede3a152ea34aece4df42',
        'info_dict': {
            'id': 'OQsEfQFVUXk',
            'ext': 'mp3',
            'title': 'Leja Re',
            'album': 'Leja Re',
            'thumbnail': 'https://c.saavncdn.com/258/Leja-Re-Hindi-2018-20181124024539-500x500.jpg',
        },
    }, {
        'url': 'https://www.saavn.com/s/song/hindi/Saathiya/O-Humdum-Suniyo-Re/KAMiazoCblU',
        'only_matching': True,
    }]

    def _real_extract(self, url):
        audio_id = self._match_id(url)
        song_data = self.extract_initial_data_as_json(url, audio_id)['song']['song']

        data = urlencode_postdata({'__call': 'song.generateAuthToken',
                                   '_format': 'json',
                                   'bitrate': '128',
                                   'url': song_data['encrypted_media_url'],
                                   })

        def clean_api_json(resp):
            return self._search_regex(r'(?P<json>\{.+?})', resp, 'api-json')

        media_url = self._download_json('https://www.jiosaavn.com/api.php',
                                        audio_id, data=data,
                                        transform_source=clean_api_json,
                                        )['auth_url']

        return {
            'id': audio_id,
            'title': song_data['title']['text'],
            'formats': [{
                'url': media_url,
                'ext': 'mp3',
                'format_note': 'MPEG audio',
                'format_id': '128',
                'vcodec': 'none',
            }],

Review comment (refactor):
```suggestion
        song_data = self._extract_initial_data(url, audio_id)['song']['song']
```

Code after:
    _VALID_URL = r'https?://(?:www\.)?(?:jiosaavn\.com/song/[^/?#]+/|saavn\.com/s/song/(?:[^/?#]+/){3})(?P<id>[^/?#]+)'
    _TESTS = [{
        'url': 'https://www.jiosaavn.com/song/leja-re/OQsEfQFVUXk',
        'md5': '7b1f70de088ede3a152ea34aece4df42',
        'info_dict': {
            'id': 'OQsEfQFVUXk',
            'ext': 'mp3',
            'title': 'Leja Re',
            'album': 'Leja Re',
            'thumbnail': 'https://c.saavncdn.com/258/Leja-Re-Hindi-2018-20181124024539-500x500.jpg',
        },
    }, {
        'url': 'https://www.saavn.com/s/song/hindi/Saathiya/O-Humdum-Suniyo-Re/KAMiazoCblU',
        'only_matching': True,
    }]

    def _real_extract(self, url):
        audio_id = self._match_id(url)
        song_data = self._extract_initial_data(url, audio_id)['song']['song']
        media_data = self._download_json(
            'https://www.jiosaavn.com/api.php', audio_id, data=urlencode_postdata({
                '__call': 'song.generateAuthToken',
                '_format': 'json',
                'bitrate': '128',
                'url': song_data['encrypted_media_url'],
            }))

        return {
            'id': audio_id,
            'url': media_data['auth_url'],
            'ext': media_data.get('type'),
            'vcodec': 'none',
            **traverse_obj(song_data, {
                'title': ('title', 'text'),
                'album': ('album', 'text'),
                'thumbnail': ('image', 0, {url_or_none}),
            }),
        }


class JioSaavnAlbumIE(JioSaavnBaseIE):
    _VALID_URL = r'https?://(?:www\.)?(?:jio)?saavn\.com/album/[^/?#]+/(?P<id>[^/?#]+)'
    _TESTS = [{
        'url': 'https://www.jiosaavn.com/album/96/buIOjYZDrNA_',
        'info_dict': {
            'id': 'buIOjYZDrNA_',
            'title': '96',
        },
        'playlist_count': 10,
    }]