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SSESongInfoUpdateEvent
data: 前缀发送 JSON。格式：
data: {"type":"song_info_update","player":"...","data":{...}}{
"type": "song_info_update",
"player": "wesing",
"data": {
"name": "告白",
"singer": "花澤香菜",
"title": "告白 - 花澤香菜",
"cover": "http://imgcache.qq.com/music/photo/mid_album_500/a/b/001aBcDe23FgHi.jpg",
"cover_base64": "data:image/jpeg;base64,/9j/4AAQSkZJRg..."
}
}