技术背景
好多开发者在做国标对接的时候，首先想到的是IPC摄像头，通过参数化配置，接入到国标平台，实现媒体数据的按需查看等操作。
像执法记录仪等智能终端，跑在Android平台，对接GB28181平台的需求也非常大，网上相关demo也不少，但真正设计符合相关协议规范、功能完善、长时间稳定运行的并不多。基于此，我们研发了Android平台GB28181接入模块，目前功能设计，总的来说，IPC有的功能要有，IPC缺失的，但是对业务诉求有要求的，也要有，比如MobilePosition实时位置上报，实时快照、本地录像、屏幕采集、拉取RTSP或RTMP对接到GB28181平台、实时动态水印、实时音量调节、外部编码前后对接等：
- [视频格式]H.264/H.265(Android H.265硬编码)；
- [音频格式]G.711 A律、AAC；
- [音量调节]Android平台采集端支持实时音量调节；
- [H.264硬编码]支持H.264特定机型硬编码；
- [H.265硬编码]支持H.265特定机型硬编码；
- [软硬编码参数配置]支持gop间隔、帧率、bit-rate设置；
- [软编码参数配置]支持软编码profile、软编码速度、可变码率设置；
- 支持横屏、竖屏推流；
- Android平台支持后台service推送屏幕(推送屏幕需要5.0+版本)；
- 支持纯视频、音视频PS打包传输；
- 支持RTP OVER UDP和RTP OVER TCP被动模式；
- 支持信令通道网络传输协议TCP/UDP设置；
- 支持注册、注销，支持注册刷新及注册有效期设置；
- 支持设备目录查询应答；
- 支持心跳机制，支持心跳间隔、心跳检测次数设置；
- 支持移动设备位置(MobilePosition)订阅和通知；
- 支持国标GB/T28181—2016平台接入；
- 支持语音广播及语音对讲；
- [实时水印]支持动态文字水印、png水印；
- [镜像]Android平台支持前置摄像头实时镜像功能；
- [实时静音]支持实时静音/取消静音；
- [实时快照]支持实时快照；
- [降噪]支持环境音、手机干扰等引起的噪音降噪处理、自动增益、VAD检测；
- [外部编码前视频数据对接]支持YUV数据对接；
- [外部编码前音频数据对接]支持PCM对接；
- [外部编码后视频数据对接]支持外部H.264数据对接；
- [外部编码后音频数据对接]外部AAC数据对接；
- [扩展录像功能]支持录像相关功能。
技术接口设计
接口设计这块，我们分三个部分：一个是供Publisher实例调用的接口，一个是RTP发送相关的接口，还有一个是针对语音广播这块，实现的接收RTP数据播放接口。
先说供GB28181推送实例调用的接口：
/*+++++++++++++++GB28181相关接口+++++++++++++++*/ /** * 设置GB28181 RTP Sender * * @param rtp_sender_handle, CreateRTPSender返回值 * @param rtp_payload_type, 对于GB28181 PS, 协议定义是96, 具体以SDP为准 * * @return {0} if successful */ public native int SetGB28181RTPSender(long handle, long rtp_sender_handle, int rtp_payload_type); /** * 启动 GB28181 媒体流 * * @return {0} if successful */ public native int StartGB28181MediaStream(long handle); /** * 停止 GB28181 媒体流 * * @return {0} if successful */ public native int StopGB28181MediaStream(long handle); /*---------------GB28181相关接口---------------*/
再说RTP发送相关的接口：
/* * SmartPublisherJniV2.java * SmartPublisherJniV2 * * WebSite: https://daniusdk.com * Github: https://github.com/daniulive/SmarterStreaming */ /*+++++++++++++++RTP Sender相关接口+++++++++++++++*/ /* * 创建RTP Sender实例 * * @param reserve：保留参数传0 * * @return RTP Sender 句柄，0表示失败 */ public native long CreateRTPSender(int reserve); /** *设置 RTP Sender传输协议 * * @param rtp_sender_handle, CreateRTPSender返回值 * @param transport_protocol, 0:UDP, 1:TCP, 默认是UDP * * @return {0} if successful */ public native int SetRTPSenderTransportProtocol(long rtp_sender_handle, int transport_protocol); /** *设置 RTP Sender IP地址类型 * * @param rtp_sender_handle, CreateRTPSender返回值 * @param ip_address_type, 0:IPV4, 1:IPV6, 默认是IPV4, 当前仅支持IPV4 * * @return {0} if successful */ public native int SetRTPSenderIPAddressType(long rtp_sender_handle, int ip_address_type); /** *设置 RTP Sender RTP Socket本地端口 * * @param rtp_sender_handle, CreateRTPSender返回值 * @param port, 必须是偶数，设置0的话SDK会自动分配, 默认值是0 * * @return {0} if successful */ public native int SetRTPSenderLocalPort(long rtp_sender_handle, int port); /** *设置 RTP Sender SSRC * * @param rtp_sender_handle, CreateRTPSender返回值 * @param ssrc, 如果设置的话，这个字符串要能转换成uint32类型, 否则设置失败 * * @return {0} if successful */ public native int SetRTPSenderSSRC(long rtp_sender_handle, String ssrc); /** *设置 RTP Sender RTP socket 发送Buffer大小 * * @param rtp_sender_handle, CreateRTPSender返回值 * @param buffer_size, 必须大于0, 默认是512*1024, 当前仅对UDP socket有效, 根据视频码率考虑设置合适的值 * * @return {0} if successful */ public native int SetRTPSenderSocketSendBuffer(long rtp_sender_handle, int buffer_size); /** *设置 RTP Sender RTP时间戳时钟频率 * * @param rtp_sender_handle, CreateRTPSender返回值 * @param clock_rate, 必须大于0, 对于GB28181 PS规定是90kHz, 也就是90000 * * @return {0} if successful */ public native int SetRTPSenderClockRate(long rtp_sender_handle, int clock_rate); /** *设置 RTP Sender 目的IP地址, 注意当前用在GB2818推送上,只设置一个地址,将来扩展如果用在其他地方，可能要设置多个目的地址，到时候接口可能会调整 * * @param rtp_sender_handle, CreateRTPSender返回值 * @param address, IP地址 * @param port, 端口 * * @return {0} if successful */ public native int SetRTPSenderDestination(long rtp_sender_handle, String address, int port); /** *初始化RTP Sender, 初始化之前先调用上面的接口配置相关参数 * * @param rtp_sender_handle, CreateRTPSender返回值 * * @return {0} if successful */ public native int InitRTPSender(long rtp_sender_handle); /** *获取RTP Sender RTP Socket本地端口 * * @param rtp_sender_handle, CreateRTPSender返回值 * * @return 失败返回0, 成功的话返回响应的端口, 请在InitRTPSender返回成功之后调用 */ public native int GetRTPSenderLocalPort(long rtp_sender_handle); /** * UnInit RTP Sender * * @param rtp_sender_handle, CreateRTPSender返回值 * * @return {0} if successful */ public native int UnInitRTPSender(long rtp_sender_handle); /** * 释放RTP Sender, 释放之后rtp_sender_handle就无效了，请不要再使用 * * @param rtp_sender_handle, CreateRTPSender返回值 * * @return {0} if successful */ public native int DestoryRTPSender(long rtp_sender_handle);
最后说，RTP接收相关的接口设计：
/* * SmartPlayerJniV2.java * SmartPlayerJniV2 * * WebSite: https://daniusdk.com * Github: https://github.com/daniulive/SmarterStreaming */ /*++++++++++++++++++RTP Receiver++++++++++++++++++++++*/ /* * 创建RTP Receiver * * @param reserve：保留参数传0 * * @return RTP Receiver 句柄，0表示失败 */ public native long CreateRTPReceiver(int reserve); /** *设置 RTP Receiver传输协议 * * @param rtp_receiver_handle, CreateRTPReceiver * @param transport_protocol, 0:UDP, 1:TCP, 默认是UDP * * @return {0} if successful */ public native int SetRTPReceiverTransportProtocol(long rtp_receiver_handle, int transport_protocol); /** *设置 RTP Receiver IP地址类型 * * @param rtp_receiver_handle, CreateRTPReceiver * @param ip_address_type, 0:IPV4, 1:IPV6, 默认是IPV4 * * @return {0} if successful */ public native int SetRTPReceiverIPAddressType(long rtp_receiver_handle, int ip_address_type); /** *设置 RTP Receiver RTP Socket本地端口 * * @param rtp_receiver_handle, CreateRTPReceiver * @param port, 必须是偶数，设置0的话SDK会自动分配, 默认值是0 * * @return {0} if successful */ public native int SetRTPReceiverLocalPort(long rtp_receiver_handle, int port); /** *设置 RTP Receiver SSRC * * @param rtp_receiver_handle, CreateRTPReceiver * @param ssrc, 如果设置的话，这个字符串要能转换成uint32类型, 否则设置失败 * * @return {0} if successful */ public native int SetRTPReceiverSSRC(long rtp_receiver_handle, String ssrc); /** *创建 RTP Receiver 会话 * * @param rtp_receiver_handle, CreateRTPReceiver * @param reserve, 保留值，目前传0 * * @return {0} if successful */ public native int CreateRTPReceiverSession(long rtp_receiver_handle, int reserve); /** *获取 RTP Receiver RTP Socket本地端口 * * @param rtp_receiver_handle, CreateRTPReceiver * * @return 失败返回0, 成功的话返回响应的端口, 请在CreateRTPReceiverSession返回成功之后调用 */ public native int GetRTPReceiverLocalPort(long rtp_receiver_handle); /** *设置 RTP Receiver Payload 相关信息 * * @param rtp_receiver_handle, CreateRTPReceiver * * @param payload_type, 请参考 RFC 3551 * * @param encoding_name, 编码名, 请参考 RFC 3551, 如果payload_type不是动态的, 可能传null就好 * * @param media_type, 媒体类型, 请参考 RFC 3551, 1 是视频, 2是音频 * * @param clock_rate, 请参考 RFC 3551 * * @return {0} if successful */ public native int SetRTPReceiverPayloadType(long rtp_receiver_handle, int payload_type, String encoding_name, int media_type, int clock_rate); /** *设置 RTP Receiver 音频采样率 * * @param rtp_receiver_handle, CreateRTPReceiver * @param sampling_rate, 音频采样率 * * @return {0} if successful */ public native int SetRTPReceiverAudioSamplingRate(long rtp_receiver_handle, int sampling_rate); /** *设置 RTP Receiver 音频通道数 * * @param rtp_receiver_handle, CreateRTPReceiver * @param channels, 音频通道数 * * @return {0} if successful */ public native int SetRTPReceiverAudioChannels(long rtp_receiver_handle, int channels); /** *设置 RTP Receiver 远端地址 * * @param rtp_receiver_handle, CreateRTPReceiver * @param address, IP地址 * @param port, 端口 * * @return {0} if successful */ public native int SetRTPReceiverRemoteAddress(long rtp_receiver_handle, String address, int port); /** *初始化 RTP Receiver * * @param rtp_receiver_handle, CreateRTPReceiver * * @return {0} if successful */ public native int InitRTPReceiver(long rtp_receiver_handle); /** *UnInit RTP Receiver * * @param rtp_receiver_handle, CreateRTPReceiver * * @return {0} if successful */ public native int UnInitRTPReceiver(long rtp_receiver_handle); /** *Destory RTP Receiver Session * * @param rtp_receiver_handle, CreateRTPReceiver * * @return {0} if successful */ public native int DestoryRTPReceiverSession(long rtp_receiver_handle); /** *Destory RTP Receiver * * @param rtp_receiver_handle, CreateRTPReceiver * * @return {0} if successful */ public native int DestoryRTPReceiver(long rtp_receiver_handle); /*++++++++++++++++++RTP Receiver++++++++++++++++++++++*/
上述接口说过之后，大家可能疑惑，信令交互呢？信令交互，我们是在Android上层实现。
如基础参数配置：
/*** GB28181 相关参数，可以修改相关参数后测试 ***/ GBSIPAgent gb28181_agent_ = null; private int gb28181_sip_local_port_base_ = 5060; private String gb28181_sip_server_id_ = "34020000002000000001"; private String gb28181_sip_domain_ = "3402000000"; private String gb28181_sip_server_addr_ = "192.168.0.103"; private int gb28181_sip_server_port_ = 15060; private String gb28181_sip_user_agent_filed_ = "NT GB User Agent V1.3"; private String gb28181_sip_username_ = "31011500991320000069"; private String gb28181_sip_password_ = "12345678"; private long gb28181_rtp_sender_handle_ = 0; private int gb28181_rtp_payload_type_ = 96; private long player_handle_ = 0; private long rtp_receiver_handle_ = 0; private AtomicLong last_received_audio_data_time_ = new AtomicLong(0); /*** GB28181 相关参数，可以修改相关参数后测试 ***/
InitGB28181Agent()相关：
private boolean initGB28181Agent() { if ( gb28181_agent_ != null ) return true; getLocation(context_); String local_ip_addr = IPAddrUtils.getIpAddress(context_); Log.i(TAG, "initGB28181Agent local ip addr: " + local_ip_addr); if ( local_ip_addr == null || local_ip_addr.isEmpty() ) { Log.e(TAG, "initGB28181Agent local ip is empty"); return false; } gb28181_agent_ = GBSIPAgentFactory.getInstance().create(); if ( gb28181_agent_ == null ) { Log.e(TAG, "initGB28181Agent create agent failed"); return false; } gb28181_agent_.addListener(this); // 必填信息 gb28181_agent_.setLocalAddress(local_ip_addr); gb28181_agent_.setServerParameter(gb28181_sip_server_addr_, gb28181_sip_server_port_, gb28181_sip_server_id_, gb28181_sip_domain_); gb28181_agent_.setUserInfo(gb28181_sip_username_, gb28181_sip_password_); // 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_interval_, gb28181_heartbeat_count_); //com.gb.ntsignalling.Device gb_device = new com.gb.ntsignalling.Device("34020000001380000001", "安卓测试设备", Build.MANUFACTURER, Build.MODEL, // "宇宙","火星1","火星", true); com.gb.ntsignalling.Device gb_device = new com.gb.ntsignalling.Device("33010752991327811433", "安卓测试设备", Build.MANUFACTURER, Build.MODEL, "宇宙","火星1","火星", true); if (mLongitude != null && mLatitude != null) { com.gb.ntsignalling.DevicePosition device_pos = new 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); /* com.gb28181.ntsignalling.Device gb_device1 = new com.gb28181.ntsignalling.Device("34020000001380000002", "安卓测试设备2", Build.MANUFACTURER, Build.MODEL, "宇宙","火星1","火星", true); if (mLongitude != null && mLatitude != null) { com.gb28181.ntsignalling.DevicePosition device_pos = new com.gb28181.ntsignalling.DevicePosition(); device_pos.setTime(mLocationTime); device_pos.setLongitude(mLongitude); device_pos.setLatitude(mLatitude); gb_device1.setPosition(device_pos); gb_device1.setSupportMobilePosition(true); } gb28181_agent_.addDevice(gb_device1); */ if (!gb28181_agent_.createSipStack()) { gb28181_agent_ = null; Log.e(TAG, "initGB28181Agent gb28181_agent_.createSipStack failed."); return false; } boolean is_bind_local_port_ok = false; // 最多尝试5000个端口 int try_end_port = gb28181_sip_local_port_base_ + 5000; try_end_port = try_end_port > 65536 ?65536: try_end_port; for (int i = gb28181_sip_local_port_base_; i < try_end_port; ++i) { if (gb28181_agent_.bindLocalPort(i)) { is_bind_local_port_ok = true; break; } } if (!is_bind_local_port_ok) { gb28181_agent_.releaseSipStack(); gb28181_agent_ = null; Log.e(TAG, "initGB28181Agent gb28181_agent_.bindLocalPort failed."); return false; } if (!gb28181_agent_.initialize()) { gb28181_agent_.unBindLocalPort(); gb28181_agent_.releaseSipStack(); gb28181_agent_ = null; Log.e(TAG, "initGB28181Agent gb28181_agent_.initialize failed."); return false; } return true; }
信令交互处理：
@Override public void ntsRegisterOK(String dateString) { Log.i(TAG, "ntsRegisterOK Date: " + (dateString!= null? dateString : "")); } @Override public void ntsRegisterTimeout() { Log.e(TAG, "ntsRegisterTimeout"); } @Override public void ntsRegisterTransportError(String errorInfo) { Log.e(TAG, "ntsRegisterTransportError error:" + (errorInfo != null?errorInfo :"")); } @Override public void ntsOnHeartBeatException(int exceptionCount, String lastExceptionInfo) { } @Override public void ntsOnInvitePlay(String deviceId, PlaySessionDescription session_des) { } @Override public void ntsOnCancelPlay(String deviceId) { } @Override public void ntsOnAckPlay(String deviceId) { } @Override public void ntsOnPlayInviteResponseException(String deviceId, int statusCode, String errorInfo) { } @Override public void ntsOnByePlay(String deviceId) { } @Override public void ntsOnPlayDialogTerminated(String deviceId) { } @Override public void ntsOnDevicePositionRequest(String deviceId, int interval) { } @Override public void ntsOnNotifyBroadcastCommand(String fromUserName, String fromUserNameAtDomain, String sn, String sourceID, String targetID) { } @Override public void ntsOnAudioBroadcast(String commandFromUserName, String commandFromUserNameAtDomain, String sourceID, String targetID) { } @Override public void ntsOnInviteAudioBroadcastException(String sourceID, String targetID, String errorInfo) { } @Override public void ntsOnInviteAudioBroadcastTimeout(String sourceID, String targetID) { }
除了基础的Camera接口外，5.0开始新的Camera2数据依旧可以正常对接，感兴趣的开发者可酌情参考。
