备到平台侧平台侧发calalog过来获取设备信息然后设备侧和国标平台侧维持心跳如果有位置订阅信息按照订阅时间间隔实时上报设备位置信息。

如果本地没有录像诉求或者国标平台侧不发起invite请求Android平台GB28181设备接入端不做视频编码甚至可以连摄像头都不打开等有实时录像或国标平台侧视频预览播放请求的时候再打开摄像头毕竟摄像头单纯的打开设备都有性能损耗甚至一些中低端记录仪还没编码就开始发热。

技术实现

本文以大牛直播SDK的Android平台GB28181设备接入侧为例先启动GB28181启动后直接注册到国标平台侧整体设计架构图如下

class

{stopAudioPlayer();destoryRTPReceiver();gb_broadcast_source_id_

null;btnGB28181AudioBroadcast.setText(GB28181语音广播);btnGB28181AudioBroadcast.setEnabled(false);stopGB28181Stream();destoryRTPSender();if

(null

{gb28181_agent_.terminateAllPlays(true);//

目前测试下来,发送BYE之后,有些服务器会立即发送INVITE,是否发送BYE根据实际情况看gb28181_agent_.stop();btnGB28181Agent.setText(启动GB28181);}else

{if

{btnGB28181Agent.setText(停止GB28181);}}}

private

true;getLocation(context_);String

local_ip_addr

IPAddrUtils.getIpAddress(context_);Log.i(TAG,

local

GBSIPAgentFactory.getInstance().create();if

gb28181_agent_

false;}gb28181_agent_.addListener(this);gb28181_agent_.addPlayListener(this);gb28181_agent_.addAudioBroadcastListener(this);gb28181_agent_.addDeviceControlListener(this);gb28181_agent_.addQueryCommandListener(this);//

必填信息gb28181_agent_.setLocalAddress(local_ip_addr);gb28181_agent_.setServerParameter(gb28181_sip_server_addr_,

gb28181_sip_domain_);gb28181_agent_.setUserInfo(gb28181_sip_username_,

gb28181_sip_password_);//gb28181_agent_.setUserInfo(gb28181_sip_username_,

可选参数gb28181_agent_.setUserAgent(gb28181_sip_user_agent_filed_);gb28181_agent_.setTransportProtocol(gb28181_sip_trans_protocol_0?UDP:TCP);//

GB28181配置gb28181_agent_.config(gb28181_reg_expired_,

gb28181_heartbeat_count_);com.gb.ntsignalling.Device

gb_device

com.gb.ntsignalling.Device(34020000001380000001,

安卓测试设备,

{com.gb.ntsignalling.DevicePosition

device_pos

com.gb.ntsignalling.DevicePosition();device_pos.setTime(mLocationTime);device_pos.setLongitude(mLongitude);device_pos.setLatitude(mLatitude);gb_device.setPosition(device_pos);gb_device.setSupportMobilePosition(true);

设置支持移动位置上报}gb28181_agent_.addDevice(gb_device);if

(!gb28181_agent_.createSipStack())

{gb28181_agent_

(gb28181_agent_.bindLocalPort(i))

true;break;}}if

{gb28181_agent_.releaseSipStack();gb28181_agent_

null;Log.e(TAG,

{gb28181_agent_.unBindLocalPort();gb28181_agent_.releaseSipStack();gb28181_agent_

null;Log.e(TAG,

OK时带的时间返回上来便于Android平台GB28181设备侧做校时如有注册异常也会返回

Override

ntsRegisterTransportError(String

errorInfo)

(lastExceptionInfo!null?lastExceptionInfo:));//

停止信令,

gb28281_heart_beart_timeout);stopAudioPlayer();destoryRTPReceiver();if

null

null)gb28181_agent_.byeAudioBroadcast(gb_broadcast_source_id_,

gb_broadcast_target_id_);gb_broadcast_source_id_

null;btnGB28181AudioBroadcast.setText(GB28181语音广播);btnGB28181AudioBroadcast.setEnabled(false);stopGB28181Stream();destoryRTPSender();if

(gb28181_agent_

{gb28181_agent_.terminateAllPlays(true);Log.i(TAG,

sip

stop);gb28181_agent_.stop();String

local_ip_addr

IPAddrUtils.getIpAddress(context_);if

(local_ip_addr

local_ip_addr);gb28181_agent_.setLocalAddress(local_ip_addr);}Log.i(TAG,

sip

start);gb28181_agent_.start();}}},0);

Override

ntsOnDevicePositionRequest(String

deviceId,

{com.gb.ntsignalling.DevicePosition

device_pos

com.gb.ntsignalling.DevicePosition();device_pos.setTime(mLocationTime);device_pos.setLongitude(mLongitude);device_pos.setLatitude(mLatitude);if

(gb28181_agent_

{gb28181_agent_.updateDevicePosition(device_id_,

String

先振铃响应下gb28181_agent_.respondPlayInvite(180,

device_id_);MediaSessionDescription

video_des

视频使用PS打包VectorMediaSessionDescription

video_des_list

session_des_.getVideoPSDescriptions();if

(video_des_list

video_des.getPSRtpMapAttribute();break;}}}if

(null

{gb28181_agent_.respondPlayInvite(488,

ntsOnInvitePlay

{gb28181_agent_.respondPlayInvite(488,

ntsOnInvitePlay

libPublisher.CreateRTPSender(0);if

rtp_sender_handle

{gb28181_agent_.respondPlayInvite(488,

ntsOnInvitePlay

device_id_);return;}gb28181_rtp_payload_type_

ps_rtpmap_attr.getPayloadType();gb28181_rtp_encoding_name_

ps_rtpmap_attr.getEncodingName();libPublisher.SetRTPSenderTransportProtocol(rtp_sender_handle,

video_des.isRTPOverUDP()?0:1);libPublisher.SetRTPSenderIPAddressType(rtp_sender_handle,

video_des.isIPv4()?0:1);libPublisher.SetRTPSenderLocalPort(rtp_sender_handle,

0);libPublisher.SetRTPSenderSSRC(rtp_sender_handle,

video_des.getSSRC());libPublisher.SetRTPSenderSocketSendBuffer(rtp_sender_handle,

2*1024*1024);

设置到2MlibPublisher.SetRTPSenderClockRate(rtp_sender_handle,

ps_rtpmap_attr.getClockRate());libPublisher.SetRTPSenderDestination(rtp_sender_handle,

libPublisher.InitRTPSender(rtp_sender_handle)

{gb28181_agent_.respondPlayInvite(488,

device_id_);libPublisher.DestoryRTPSender(rtp_sender_handle);return;}int

local_port

libPublisher.GetRTPSenderLocalPort(rtp_sender_handle);if

(local_port

{gb28181_agent_.respondPlayInvite(488,

device_id_);libPublisher.DestoryRTPSender(rtp_sender_handle);return;}Log.i(TAG,get

local_port:

IPAddrUtils.getIpAddress(context_);MediaSessionDescription

local_video_des

MediaSessionDescription(video_des.getType());local_video_des.addFormat(String.valueOf(ps_rtpmap_attr.getPayloadType()));local_video_des.addRtpMapAttribute(ps_rtpmap_attr);local_video_des.setAddressType(video_des.getAddressType());local_video_des.setAddress(local_ip_addr);local_video_des.setPort(local_port);local_video_des.setTransportProtocol(video_des.getTransportProtocol());local_video_des.setSSRC(video_des.getSSRC());if

(!gb28181_agent_.respondPlayInviteOK(device_id_,local_video_des)

{libPublisher.DestoryRTPSender(rtp_sender_handle);Log.e(TAG,

ntsOnInvitePlay

failed.);return;}gb28181_rtp_sender_handle_

String

{InitAndSetConfig();}libPublisher.SetGB28181RTPSender(publisherHandle,

gb28181_rtp_encoding_name_);//libPublisher.SetGBTCPConnectTimeout(publisherHandle,

10*60*1000);//libPublisher.SetGBInitialTCPReconnectInterval(publisherHandle,

1000);//libPublisher.SetGBInitialTCPMaxReconnectAttempts(publisherHandle,

3);int

libPublisher.StartGB28181MediaStream(publisherHandle);if

(startRet

publisherHandle;publisherHandle

0;libPublisher.SmartPublisherClose(handle);}}destoryRTPSender();Log.e(TAG,

Failed

{CheckInitAudioRecorder();}startLayerPostThread();isGB28181StreamRunning

true;}private

除此之外还有语音广播和语音对讲这里不再赘述GB28181规范普及之前要想从外网远程访问局域网内的监控设备非常麻烦一般要么RTSP转RTMP推到RTMP服务器此外还要单独构建信令。

GB28181规范让远程、跨网访问监控设备更方便把GB28181平台部署到外网后前端设备只要注册到国标服务器就可以被远程访问、管理和调取视频。

但由于设备侧性能并不是非常好如果要有好的稳定性和性能要求需尽可能的减少性能消耗按需打开摄像头、按需编码等。