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GB28181协议——摄像机语音对讲

發布時間：2023/12/9 编程问答 49 豆豆

生活随笔收集整理的這篇文章主要介紹了 GB28181协议——摄像机语音对讲小編覺得挺不錯的,現在分享給大家,幫大家做個參考.

- `大華攝像機支持跨網對講`
- - 大華攝像機對講
- `非大華攝像機，對講僅局域網有效`
- - 看文檔
  - - 設備是否具備語音輸出能力?
    - 關于對講
  - 語音廣播
  - - 廣播通知
    - 廣播通知結果
    - 等待廣播請求
    - 等待ACK
    - 開始廣播發送音頻數據
    - 關閉廣播
    - 關閉音頻發送端口

大華攝像機支持跨網對講

大華攝像機音頻對講不需要同時播放視頻；
大華攝像機對講支持sendrecv；
主動發送invite到攝像機 ,收到200回復后，再發送ack到攝像機；接下會收到來自攝像機的音頻數據，此時可以獲取到udp ip地址(peer_ip) 和端口(peer_port)，udp peer_ip 和 peer_port 發送音頻數據到攝像機。
大華攝像機對講接收發送音頻數據的udp端口是同一個端口，因此，大華攝像機能夠支持跨網對講。

大華攝像機對講

INVITE sip:34020000001370000001@3402000000 SIP/2.0 Via: SIP/2.0/UDP 192.168.32.33:14000;rport;branch=z9hG4bK7d0821ae From: <sip:34020000002000000033@3402000000>;tag=1752762308 To: <sip:34020000001370000001@3402000000> Call-ID: 1949196054 CSeq: 5 INVITE Content-Type: APPLICATION/SDP Contact: <sip:34020000002000000033@192.168.32.33:14000> Max-forwards: 70 User-Agent: tiamaes Subject: 34020000001370000001:2,34020000002000000033:2 Content-Length: 183v=0 o=34020000002000000033 0 0 IN IP4 192.168.32.33 s=Talk c=IN IP4 192.168.32.33 t=0 0 m=audio 25000 RTP/AVP 8 a=sendrecv a=rtpmap:8 PCMA/8000 f=v/a/1/8/1 y=0200000002  SIP/2.0 100 Trying Call-ID: 1949196054 Content-Length: 0 CSeq: 5 INVITE From: <sip:34020000002000000033@3402000000>;tag=1752762308 To: <sip:34020000001370000001@3402000000> User-Agent: SIP UAS V3.0.0.1049939 Via: SIP/2.0/UDP 192.168.32.33:14000;rport=14000;branch=z9hG4bK7d0821ae SIP/2.0 101 Dialog Establishment Call-ID: 1949196054 Contact: <sip:34020000001180005001@192.168.32.13:5060> Content-Length: 0 CSeq: 5 INVITE From: <sip:34020000002000000033@3402000000>;tag=1752762308 To: <sip:34020000001370000001@3402000000>;tag=5aaf5dffc1105842785cdf093029bcf8 User-Agent: SIP UAS V3.0.0.1049939 Via: SIP/2.0/UDP 192.168.32.33:14000;rport=14000;branch=z9hG4bK7d0821ae SIP/2.0 200 OK Call-ID: 1949196054 Contact: <sip:34020000001180005001@192.168.32.13:5060> Content-Length: 270 Content-Type: application/sdp CSeq: 5 INVITE From: <sip:34020000002000000033@3402000000>;tag=1752762308 To: <sip:34020000001370000001@3402000000>;tag=5aaf5dffc1105842785cdf093029bcf8 User-Agent: SIP UAS V3.0.0.1049939 Via: SIP/2.0/UDP 192.168.32.33:14000;rport=14000;branch=z9hG4bK7d0821aev=0 o=34020000001310000001 0 0 IN IP4 192.168.32.13 s=Talk i=VCam Talk Session c=IN IP4 192.168.32.13 t=0 0 m=audio 9712 RTP/AVP 8 a=recvonly a=rtpmap:8 PCMA/8000/1 m=audio 9712 RTP/AVP 8 a=sendonly a=rtpmap:8 PCMA/8000/1 y=0200000002 f=v/0/0/0/0/0a/0/0/0  ACK sip:34020000001370000001@3402000000 SIP/2.0 Via: SIP/2.0/UDP 192.168.32.33:14000;rport;branch=z9hG4bK6e554aa5 From: <sip:34020000002000000033@3402000000>;tag=1752762308 To: <sip:34020000001370000001@3402000000>;tag=5aaf5dffc1105842785cdf093029bcf8 Call-ID: 1949196054 CSeq: 5 ACK Contact: <sip:34020000002000000033@192.168.32.33:14000> Max-forwards: 70 User-Agent: tiamaes Content-Length: 0

非大華攝像機，對講僅局域網有效

看文檔

前端語音輸出設備：攝像機IPC 音頻輸出接口連接的音箱
配置攝像機GB28181:音頻通道編碼ID : 34020000001370000001 (必須137 文檔第3段)

設備是否具備語音輸出能力?

文檔第2段；如下：設備目錄查詢應答消息

MESSAGE sip:34020000002000000001@3402000000 SIP/2.0 Via: SIP/2.0/UDP 192.168.1.64:5060;rport;branch=z9hG4bK564971777 From: <sip:34020000001110000001@3402000000>;tag=173379301 To: <sip:34020000002000000001@3402000000> Call-ID: 268626630 CSeq: 20 MESSAGE Content-Type: Application/MANSCDP+xml Max-Forwards: 70 User-Agent: IP Camera Content-Length: 967<?xml version="1.0" encoding="GB2312"?> <Response> <CmdType>Catalog</CmdType> <SN>837438569</SN> <DeviceID>34020000001110000001</DeviceID> <SumNum>2</SumNum> <DeviceList Num="2"> <Item> <DeviceID>34020000001310000001</DeviceID> <Name>Camera 01</Name> <Manufacturer>Hikvision</Manufacturer> <Model>IP Camera</Model> <Owner>Owner</Owner> <CivilCode>3402000000</CivilCode> <Address>Address</Address> <Parental>0</Parental> <ParentID>34020000002000000001</ParentID> <SafetyWay>0</SafetyWay> <RegisterWay>1</RegisterWay> <Secrecy>0</Secrecy> <Status>ON</Status> </Item> <Item>  <DeviceID>34020000001370000001</DeviceID> <Name></Name> <Manufacturer>Hikvision</Manufacturer>  <Model>AudioOut</Model> <Owner>Owner</Owner> <CivilCode>3402000000</CivilCode> <Address>Address</Address> <Parental>0</Parental> <ParentID>34020000001110000001</ParentID> <SafetyWay>0</SafetyWay> <RegisterWay>1</RegisterWay> <Secrecy>0</Secrecy> <Status>ON</Status> </Item> </DeviceList> </Response>

關于對講

實時音視頻點播 + 語音廣播 = 語音對講

語音廣播

廣播通知

》》》》》》 IPC MESSAGE sip:34020000001110000001@3402000000 SIP/2.0 From: <sip:34020000002000000001@3402000000>;tag=bccedfd000006 To: <sip:34020000001110000001@3402000000> Content-Length: 176 CSeq: 5 MESSAGE Route: <sip:34020000001110000001> Call-ID: 12345678900006 Via: SIP/2.0/UDP 192.168.1.101:5060;wlsscid=377aa9afcf1b36f;branch=123133532300006 Content-Type: Application/MANSCDP+xml Max-Forwards: 70<?xml version="1.0"?> <Notify> <CmdType>Broadcast</CmdType> <SN>17298</SN>  <SourceID>34020000002000000001</SourceID>  <TargetID>34020000001370000001</TargetID> </Notify> 《《《《《《 IPC SIP/2.0 200 OK Via: SIP/2.0/UDP 192.168.1.101:5060;wlsscid=377aa9afcf1b36f;branch=123133532300006 From: <sip:34020000002000000001@3402000000>;tag=bccedfd000006 To: <sip:34020000001110000001@3402000000>;tag=880670885 Call-ID: 12345678900006 CSeq: 5 MESSAGE User-Agent: IP Camera Content-Length: 0

廣播通知結果

《《《《《《 IPC MESSAGE sip:34020000002000000001@3402000000 SIP/2.0 Via: SIP/2.0/UDP 192.168.1.64:5060;rport;branch=z9hG4bK2058843697 From: <sip:34020000001110000001@3402000000>;tag=477173126 To: <sip:34020000002000000001@3402000000> Call-ID: 69994435 CSeq: 20 MESSAGE Content-Type: Application/MANSCDP+xml Max-Forwards: 70 User-Agent: IP Camera Content-Length: 169<?xml version="1.0" encoding="GB2312"?> <Response> <CmdType>Broadcast</CmdType> <SN>17298</SN>  <DeviceID>34020000001370000001</DeviceID> <Result>OK</Result> </Response> 》》》》》》 IPC SIP/2.0 200 OK Via: SIP/2.0/UDP 192.168.1.64:5060;rport;branch=z9hG4bK2058843697 To: <sip:34020000002000000001@3402000000>;tag=12341241234 From: <sip:34020000001110000001@3402000000>;tag=477173126 Call-ID: 69994435 CSeq: 20 MESSAGE User-Agent: General Content-Length: 0

等待廣播請求

Call-ID：廣播請求 ~ 關閉廣播sip消息中值Call-ID：不變

《《《《《《 IPC INVITE sip:34020000002000000001@192.168.1.101:5060 SIP/2.0 Via: SIP/2.0/UDP 192.168.1.64:5060;rport;branch=z9hG4bK1490643408 From: <sip:34020000001110000001@192.168.1.64:5060>;tag=1499847265 // To: <sip:34020000002000000001@192.168.1.101:5060> Call-ID: 1420309512 CSeq: 20 INVITE Contact: <sip:34020000001110000001@192.168.1.64:5060> Content-Type: application/sdp Max-Forwards: 70 User-Agent: IP Camera  Subject: 34020000002000000001:1,34020000001110000001:2 Content-Length: 214v=0 o=34020000001110000001 2418 2418 IN IP4 192.168.1.64 s=Play c=IN IP4 192.168.1.64 t=0 0  m=audio 15062 RTP/AVP 8 96 a=recvonly  a=rtpmap:8 PCMA/8000 a=rtpmap:96 PS/90000  y=0200000017  f=v/a/1/8/1

注意：響應invite消息時, To : tag= 不能為空，可以=Call-ID的值
準備一個可用的udp端口：如8000

》》》》》》 IPC SIP/2.0 200 OK From: <sip:34020000001110000001@192.168.1.64:5060>;tag=1499847265 To: <sip:34020000002000000001@192.168.1.101:5060>;tag=1420309512 Call-ID: 1420309512 CSeq: 20 INVITE User-Agent: General SIP UAS V1.0 Via: SIP/2.0/UDP 192.168.1.64:5060;rport;branch=z9hG4bK1490643408 Contact: <sip:34020000002000000001@192.168.1.101:5060> Content-Type: application/SDP Content-Length: 182v=0 o=34020000002000000001 0 0 IN IP4 192.168.1.101 s=Play c=IN IP4 192.168.1.101 t=0 0 m=audio 8000 RTP/AVP 8 // 端口：8000 a=rtpmap:8 PCMA/8000 //rtpmap:8 PCMA及g711a 采樣率：8000HZ a=sendonly y=0200000017

等待ACK

《《《《《《 IPC ACK sip:34020000002000000001@192.168.1.101:5060 SIP/2.0 Via: SIP/2.0/UDP 192.168.1.64:5060;rport;branch=z9hG4bK106578989 From: <sip:34020000001110000001@192.168.1.64:5060>;tag=1499847265 To: <sip:34020000002000000001@192.168.1.101:5060>;tag=1420309512 Call-ID: 1420309512 CSeq: 20 ACK Contact: <sip:34020000001110000001@192.168.1.64:5060> Max-Forwards: 70 User-Agent: IP Camera Content-Length: 0

開始廣播發送音頻數據

收到ACK 不需要發送響應消息；創建udp ( 本地端口：8000，目標ip:192.168.1.64，目標端口; 15062)
開始RTP打包g711a音頻數據發送到攝像頭。打包方式見： RTP打包音頻g711

關閉廣播

》》》》》》IPCBYE sip:34020000001370000001@3402000000 SIP/2.0 From: <sip:34020000002000000001@3402000000>;tag=1420309512 To: <sip:34020000001370000001@3402000000>;tag=1499847265 CSeq: 2 BYE Call-ID: 1420309512 Via: SIP/2.0/UDP 192.168.1.64:5060;branch=z9hG4bKee5c5d98-00007 Max-Forwards: 70 Content-Length: 0 《《《《《《 IPC SIP/2.0 200 OK Via: SIP/2.0/UDP 192.168.1.64:5060;branch=z9hG4bKee5c5d98-00007;received=192.168.1.101 From: <sip:34020000002000000001@3402000000>;tag=1420309512 To: <sip:34020000001370000001@3402000000>;tag=1499847265 Call-ID: 1420309512 CSeq: 2 BYE User-Agent: IP Camera Content-Length: 0

關閉音頻發送端口

總結

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