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JT/T 1078-2016 PDF EnglishSearch result: JT/T 1078-2016
JT/T1078-2016 (JTT1078-2016): PDF in EnglishJT/T 1078-2016 JT TRANSPORTATION INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 03.220.20; 35.240.60 M 53 Registration number. GNSS system for operating vehicles - Video communication protocol ISSUED ON. OCTOBER 21, 2016 IMPLEMENTED ON. JANUARY 01, 2017 Issued by. Ministry of Transport of the People’s Republic of China Table of Contents Foreword ... 4 1 Scope ... 5 2 Normative references ... 5 3 Terms, definitions, abbreviations ... 6 3.1 Terms and definitions ... 6 3.2 Abbreviations ... 6 4 Protocol basis between video terminal and video platform ... 6 4.1 Basic agreement of protocol ... 7 4.2 Convention on real-time audio-video transmission channel ... 7 4.3 Classification of audio-video communication messages ... 8 5 Communication protocol between video terminal and video platform ... 8 5.1 Protocol command set ... 8 5.2 Inheritance commands ... 8 5.3 Parameter setting commands ... 8 5.4 Video-alarm command ... 15 5.5 Real-time audio-video transmission command ... 17 5.6 Historical audio-video query, playback and download commands ... 20 5.7 PTZ control commands ... 26 5.8 Terminal sleep wakeup command ... 28 6 Code-stream communication between audio-video streaming server and client play software ... 28 6.1 Encapsulation format of audio-video streaming and passthrough data ... 28 6.2 Format of audio-video stream request URL command ... 29 7 Basis of communication protocol between video platforms ... 30 8 Process of video platform communication protocol ... 30 8.1 Time-based password report and request services ... 30 8.2 Real-time audio-video services ... 30 8.3 Remote video searching services ... 31 8.4 Remote video download services ... 31 8.5 Remote video playback services ... 32 9 Definitions of communication protocol constant between video platforms .. 33 9.1 Identifier of service data type ... 33 9.2 Identifiers of sub-service types ... 34 9.3 Coding of video-alarm type ... 35 10 Data-body format of communication protocol between video platform ... 35 10.1 Time-based password report and request services ... 35 10.2 Real-time audio-video services ... 37 10.3 Remote video searching ... 40 10.4 Remote video playback ... 43 10.5 Remote video download ... 46 Appendix A (Normative) Message comparison between video terminal and video platform ... 51 GNSS system for operating vehicles - Video communication protocol 1 Scope This standard specifies the protocol basis and communication protocol between the vehicle-mounted video terminal and the video platform in the satellite positioning system of the road transport vehicle, the code-stream communication between the audio-video stream server and the client’s playing software, the communication protocol basis, communication protocol flow, constant definition, protocol data volume’s format between the video platforms. This standard is applicable to the transmission of audio-video data between the vehicle-mounted video terminal of the satellite positioning system of the road transport vehicle and the enterprise’s video surveillance platform, as well as the exchange and sharing of audio-video resources between different video platforms. 2 Normative references The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this standard. JT/T 808-2011 GNSS system for operating vehicles - General specifications for vehicle terminal communication protocol and data-format JT/T 809-2011 GNSS system for operating vehicles - General specifications for data exchange between platforms JT/T 1076-2016 GNSS system for operating vehicles - Technical specification for onboard video terminals JT/T 415-2006 Electronic government platform for administration of road transportation - Cataloguing and coding rules IETF RFC 3550 Real-time transport protocol (RTP) IETF RFC 2854 The Text/Html media type platform 4.1 Basic agreement of protocol The communication method, data type, transmission rules and message composition of the protocol are in accordance with the requirements of clause 4 of JT/T 808-2011. The communication connection mode of the signaling data message in the protocol is in accordance with the requirements of clause 5 of JT/T 808-2011. The message processing mechanism of the signaling data message in the protocol is in accordance with the requirements of clause 6 of JT/T 808-2011. The encryption mechanism of the signaling data message in the protocol is in accordance with the requirements of clause 7 of JT/T 808-2011. The parties to the protocol for platform and terminal communication shall meet the following requirements. - Unless otherwise specified, all messages shall be responded; - If a dedicated response message is not explicitly specified, it shall use the universal response reply; - For messages with sub-packet, the responder shall respond on a packet- by-packet basis for each sub-packet message. 4.2 Convention on real-time audio-video transmission channel A real-time audio-video transmission channel may either transmit one channel of video information or one channel of audio information, or transmit one channel of video information and one channel of audio information. There are two types of conventions on the real-time audio-video transmission channel. - When using the TCP method, each TCP connection may carry multiple audio-video channels. If there is no data transmission within the set timeout period, both the terminal and the monitoring center may actively close the TCP connection which is used for audio-video data transmission. - When using UDP method, each UDP port may carry multiple audio-video channels. Table 2 (continued) Start byte Field Data type Description and requirements 10 Storage stream resolution BYTE 0. QCIF 1. CIF; 2. WCIF; 3. D1; 4. WD1; 5. 720P; 6. 1080P; 100 ~ 127. Customized 11 Storage stream key frame interval WORD Range (1 ~ 1000) frames 13 Storage stream target frame rate BYTE Range (1 ~ 120) frames / s 14 Storage stream target code rate DWORD Unit in thousand bits per second (kbps) 18 OSD subtitle overlay settings WORD Bitwise setting. 0 means no overlay, 1 means overlay bit0. date and time; bit1. the license plate’s number; bit2. logical channel’s number; bit3. latitude and longitude; bit4. travel recording speed; bit5. satellite positioning speed; bit6. continuous driving time; bit7 ~ bit10. reserved; Bit11 ~ bit15. customized 20 Whether to enable audio output BYTE 0. not enabled; 1. enabled Table 3 -- Audio-video channel list Start byte Field Data type Description and requirements 0 Total number of audio-video channels BYTE Represented by 1 1 Total number of audio channels BYTE Represented by m 2 Total number of video channels BYTE Represented by n 3 Comparison of audio-video channels BYTE [4 x (1 + m + n)] See Table 4 Table 4 -- Comparison of audio-video channels Start byte Field Data type Description and requirements 0 Physical-channel’s number BYTE Started from 1 1 Logical-channel number BYTE According to Table 2 in JT/T 1076-2016 Table 4 (continued) Start byte Field Data type Description and requirements 2 Channel type BYTE 0. Audio-video; 1. Audio; 2. Video 5.3.3 Terminal upload audio-video attributes Message ID. 0x1003. Message type. Signaling data message. Use the command of terminal upload audio-video attributes, to respond to the message of querying terminal audio-video attributes as delivered by the platform. The data-format of the message-body is as shown in Table 11. Table 11 -- Data-format of terminal upload audio-video attribute Start byte Field Data type Description and requirements 0 Input audio coding method BYTE See Table 12 1 Input audio channel’s number BYTE 2 Input audio sample rate BYTE 0. 8 kHz; 1. 22.05 kHz; 2. 44.1 kHz; 3. 48 kHz 3 Input audio sample bits BYTE 0. 8-bit; 1. 16-bit; 2. 32-bit 4 Audio frame length WORD Range 1 ~ 4294967295 6 Whether it supports audio output BYTE 0. not supported; 1. supported 7 Video coding method BYTE See Table 19 8 Maximum number of audio physical-channels as supported by the terminal BYTE 9 Maximum number of video physical-channels as supported by the terminal BYTE Table 12 -- Definitions of audio-video coding type Code Name Remarks 0 Reserved 1 G.721 Audio 2 G.722 Audio 3 G.723 Audio 4 G.728 Audio 5 G.729 Audio Message ID. 0x1005. Message type. signaling data message. The terminal equipment uses video analysis to count the passengers getting on and off, send the counting result to the platform. The format of the message- body data is as shown in Table 16. Table 16 -- Data-format of terminal upload passenger-traffic Start byte Field Data type Description and requirements 0 Start-time BCD [6] YY-MM-DD-HH-MM-SS (GMT+ 8 time, the time involved hereinafter in this standard uses this time zone) 6 End-time BCD [6] YY-MM-DD-HH-MM-SS 12 Number of getting-on passengers WORD Number of getting-on passengers from the start-time to end- time 14 Number of getting-off passengers WORD Number of getting-off passengers from the start-time to end- time 5.5 Real-time audio-video transmission command 5.5.1 Real-time audio-video transmission request Message ID. 0x9101. Message type. signaling data message. The platform requests real-time audio-video transmission from the terminal device, including real-time video transmission, active two-way voice-intercom, one-way monitoring, broadcast voice to all terminals, and specific passthrough. The message-body’s data-format is as shown in Table 17. After receiving the message, the terminal replies to the video terminal with universal response, then establishes a transmission link through t.......Source: https://www.ChineseStandard.net/PDF.aspx/JTT1078-2016 |