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弹幕协议

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METO edited this page May 6, 2018 · 1 revision

弹幕接口地址可以通过 https://api.live.bilibili.com/api/player?id=cid:23058&platform=pc&player_type=web 进行获取

...
<dm_ws_port>2244</dm_ws_port>
<dm_wss_port>2245</dm_wss_port>
<dm_port>2243</dm_port>
<dm_server>broadcastlv.chat.bilibili.com</dm_server>
<dm_server_list>119.23.41.85,118.89.14.115,broadcastlv.chat.bilibili.com</dm_server_list>
...

主要有三种接口，经过测试，三种接口协议上都类似

协议格式

+-------------+-----------------------------------------+------------------+
|             |                PACKAGE                  |                  |
|   HEADLEN   +-------+-------+------------+------------+       DATA       |
|             |  LEN  |  VER  |   OPTION   |  SEQUENCE  |                  |
+-------------+-------+-------+------------+------------+------------------+
|      4      |   2   |   2   |     4      |     4      |    HEADLEN - 16  |
+-------------+-------+-------+------------+------------+------------------+
name description value
HEADLEN 数据包总长度 int
LEN 协议包长度 0x10
VER 协议包版本 0x01
OPTION 行为 int
SEQUENCE 协议包序号（可能没用） 0x0001
DATA 数据包内容 string

协议行为

name value description
WS_OP_HEARTBEAT 2 发送心跳包
WS_OP_HEARTBEAT_REPLY 3 心跳包回复
WS_OP_MESSAGE 5 弹幕信息
WS_OP_USER_AUTHENTICATION 7 初始握手
WS_OP_CONNECT_SUCCESS 8 握手成功

握手包

0000  00 00 00 5a 00 10 00 01  00 00 00 07 00 00 00 01   ...Z.... ........
0010  7b 22 75 69 64 22 3a 30  2c 22 72 6f 6f 6d 69 64   {"uid":0 ,"roomid
0020  22 3a 32 33 30 35 38 2c  22 70 72 6f 74 6f 76 65   ":23058, "protove
0030  72 22 3a 31 2c 22 70 6c  61 74 66 6f 72 6d 22 3a   r":1,"pl atform":
0040  22 77 65 62 22 2c 22 63  6c 69 65 6e 74 76 65 72   "web","c lientver
0050  22 3a 22 31 2e 33 2e 33  22 7d                     ":"1.3.3 "}

DATA 部分为一个 Json 字符串

{
   "uid" : 0, // 用户 id，游客为 0
   "roomid" : 23058, // 直播间号
   "platform" : "web",
   "protover" : 1,
   "clientver" : "1.3.3"
}

握手成功后会返回成功信息 WS_OP_CONNECT_SUCCESS

0000  00 00 00 10 00 10 00 01  00 00 00 08 00 00 00 01   ........ ........

心跳包

0000  00 00 00 10 00 10 00 01  00 00 00 02 00 00 00 01   ........ ........

发送心跳后会接受到一个心跳回复，其中 DATA 部分为人数信息 0x25e1 = 9697，现在应该叫做人气值

0000  00 00 00 14 00 10 00 01  00 00 00 03 00 00 00 01   ........ ........
0010  00 00 25 e1                                        ..%?
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