获取bilibili直播弹幕的WebSocket协议
我已经写成了Python版弹幕客户端
连接
首先URL中的ID和真正的房间ID不一样，要先请求https://api.live.bilibili.com/room/v1/Room/room_init?id=URL中的ID获取房间ID。返回的是JSON数据，['data']['room_id']就是真正的房间ID
然后用WebSocket连接wss://broadcastlv.chat.bilibili.com:2245/sub
封包格式
封包由头部和数据组成，字节序均为大端模式
头部格式：
| 偏移量 | 长度 | 含义 |
|---|---|---|
| 0 | 4 | 封包总大小 |
| 4 | 2 | 头部长度 |
| 6 | 2 | 协议版本，目前是1 |
| 8 | 4 | 操作码（封包类型） |
| 12 | 4 | sequence，可以取常数1 |
已知的操作码：
| 操作码 | 含义 |
|---|---|
| 2 | 客户端发送的心跳包 |
| 3 | 人气值，数据不是JSON，是4字节整数 |
| 5 | 命令，数据中['cmd']表示具体命令 |
| 7 | 认证并加入房间 |
| 8 | 服务器发送的心跳包 |
数据格式：一般为JSON字符串UTF-8编码
认证并加入房间
连接后客户端先发认证包
{
"uid": 0表示未登录，否则为用户ID,
"roomid": 房间ID,
"protover": 1,
"platform": "web",
"clientver": "1.4.0"
}心跳包
客户端要每30s发一次
命令包
根据前端代码，数据也可能是多条命令的数组，不过我只收到过单条命令。每条命令中['cmd']表示具体命令
已知的命令：
| 命令 | 含义 |
|---|---|
| DANMU_MSG | 收到弹幕 |
| SEND_GIFT | 有人送礼 |
| WELCOME | 欢迎加入房间 |
| WELCOME_GUARD | 欢迎房管加入房间 |
| SYS_MSG | 系统消息 |
| PREPARING | 主播准备中 |
| LIVE | 直播开始 |
| WISH_BOTTLE | 许愿瓶？ |
收到弹幕
数据示例：
{
"info": [
[
0,
1,
25,
16777215,
1526267394,
-1189421307,
0,
"46bc1d5e",
0
],
"空投！",
[
10078392,
"白の驹",
0,
0,
0,
10000,
1,
""
],
[
11,
"狗雨",
"宫本狗雨",
102,
10512625,
""
],
[
23,
0,
5805790,
">50000"
],
[
"title-111-1",
"title-111-1"
],
0,
0,
{
"uname_color": ""
}
],
"cmd": "DANMU_MSG"
}可以看出['info'][1]是弹幕内容，['info'][2][1]是弹幕作者
有人送礼
数据示例：
{
"cmd": "SEND_GIFT",
"data": {
"giftName": "辣条",
"num": 7,
"uname": "夏目玲子swd",
"face": "http://i2.hdslb.com/bfs/face/9524d7af30933b5b1775cad35c84c7088973ee82.jpg",
"guard_level": 0,
"rcost": 334559138,
"uid": 37050641,
"top_list": [
{
"uid": 6179862,
"uname": "MiKu爬呀爬",
"face": "http://i0.hdslb.com/bfs/face/63f6017b9ebc90da8190b79dd43f73b5fe3a80fa.jpg",
"rank": 1,
"score": 694800,
"guard_level": 0,
"isSelf": 0
},
{
"uid": 889098,
"uname": "CI0rHJpguwHIMZZ9",
"face": "http://i1.hdslb.com/bfs/face/d0c40aa0fdfe1e79603d98869875fc173c1aeebb.jpg",
"rank": 2,
"score": 618600,
"guard_level": 3,
"isSelf": 0
},
{
"uid": 6573945,
"uname": "爱奇艺视频",
"face": "http://i0.hdslb.com/bfs/face/e1f0940fd35c33fbdf2f159fc520778030973287.jpg",
"rank": 3,
"score": 478000,
"guard_level": 0,
"isSelf": 0
}
],
"timestamp": 1526267395,
"giftId": 1,
"giftType": 0,
"action": "喂食",
"super": 0,
"super_gift_num": 0,
"price": 100,
"rnd": "77030604",
"newMedal": 0,
"newTitle": 0,
"medal": [ ],
"title": "",
"beatId": "",
"biz_source": "live",
"metadata": "",
"remain": 0,
"gold": 0,
"silver": 0,
"eventScore": 0,
"eventNum": 0,
"smalltv_msg": [ ],
"specialGift": null,
"notice_msg": [ ],
"capsule": {
"colorful": {
"coin": 0,
"change": 0,
"progress": {
"now": 0,
"max": 5000 }
},
"normal": {
"coin": 0,
"change": 0,
"progress": {
"now": 0,
"max": 10000 }
},
"move": 1
},
"addFollow": 0,
"effect_block": 1,
"coin_type": "silver",
"total_coin": 700
}
}自己分析吧，我只对弹幕感兴趣…