CN102547239A - Android mobile terminal-based video monitoring system - Google Patents
Android mobile terminal-based video monitoring system Download PDFInfo
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- CN102547239A CN102547239A CN2011104517047A CN201110451704A CN102547239A CN 102547239 A CN102547239 A CN 102547239A CN 2011104517047 A CN2011104517047 A CN 2011104517047A CN 201110451704 A CN201110451704 A CN 201110451704A CN 102547239 A CN102547239 A CN 102547239A
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Abstract
An Android mobile terminal-based video monitoring system comprises a device side, a server side and an Android mobile terminal, which are connected via the Internet, wherein the Android mobile terminal accesses the Internet via the 3G network, the device side takes charge in video data acquisition, H.264 image compression and RTP (Real Time Protocol) fragment packing, the server side comprises an SIP (Session Initiation Protocol) signaling server and a video-forwarding server, the SIP signaling server mainly manages and controls a user and a device by means of the SIP protocol, the video-forwarding server simultaneously establishes RTP connection with the device side and the Android mobile terminal when the user invites video, and takes charge in forwarding video data to the Android mobile terminal from the device side, and a most visual video monitoring interface is provided for the user on the Android mobile terminal. Via the mobile communication network, the Android mobile terminal-based video monitoring system uses the Android mobile terminal to carry out real-time video monitoring.
Description
Technical field
The present invention relates to the mobile video monitor field, be a kind of under 3G network the Active Eyes based on the Android portable terminal.
Background technology
Video monitoring service has a long history, and is being widely used in sector application fields such as security protection, traffic accident processing traditionally.Along with people's is to the further investigation of information technology; Technology such as image processing, video compression has obtained developing rapidly; The video coding compression is gradually to high compression rate, high-quality, low transfer rate development; For example MPEG-4, JVT, H.264 wait, the video monitoring technology that is the basis with these technology is constantly ripe.Chinese Ministry of Industry and Information provided 3G license in 2009, and China Mobile network formally gets into the 3G epoch.This has caused the transformation that traditional internet, applications is used to mobile Internet, and original mobile network's limitation weakens the constraint of mobile video monitor development gradually.Simultaneously, along with the enhancing of cell-phone function, the lifting of performance, by video monitoring technology with mobile network's technological incorporation and mobile video monitor become the new trend of video monitoring just gradually.
In recent years; By the mobile phone operating system Android expansion rapidly on portable terminal market of increasing income based on the Linux platform that Google announced on November 5th, 2007, wherein HTC, three magnitude main flow portable terminal production commercial cities are adopted the operating system of Android system as the new generation of intelligent mobile phone in succession.Nowadays; The Android mobile phone has occupied the half of the country, market; Various application programs also emerge in an endless stream, therefore the exploitation popularization that extremely helps mobile video monitor based on the video surveillance applications program of Android system with popularize, very broad market prospects are arranged.
Through existing patent is retrieved, patent relevant with mobile video monitor or product have had appearance, are not realizing based on the video monitoring on the portable terminal of Android system but in patent documentation of having announced and product, have as yet to relate to.
Summary of the invention
In order to overcome the deficiency that existing video monitoring system can't be applicable to the Android system; The present invention provides a kind of and on the portable terminal based on the Android system, realizes video monitoring system; To reach, use the Android portable terminal to carry out real-time video monitoring through mobile communications network.
For solving the problems of the technologies described above, the technical scheme that the present invention adopted is:
A kind of video monitoring based on the Android portable terminal; Form by equipment end, server end and Android portable terminal; Be connected with 3G network between them, wherein equipment end is responsible for gathering video data, H.264 image compression and the packing of RTP (Real Time Protocol) burst; Server end comprises SIP (Session Initiation Protocol) signal server and video forwarding server; The SIP signal server is mainly managed, is controlled user and equipment through Session Initiation Protocol; The video forwarding server is when the user invites video, to set up RTP simultaneously with equipment end and Android terminal to be connected, and is responsible for video data slave unit end is forwarded to the Android portable terminal; On the Android portable terminal, video monitoring interface the most intuitively is provided for the user; (1) adopt Session Initiation Protocol to carry out alternately between Android mobile client and the SIP signal server; After the user initiates a session request; Use user name and password to register login, logining successfully, the back user can carry out list of devices request, video invitation operations; (2) Android mobile client and video forwarding server adopt the Real-time Transport Protocol transmitting video data; In view of packet packet loss and out of order and cause the phenomenon of picture frame losing may appear in 3G network; Client is not handled when receiving the RTP packet at once, but has adopted caching mechanism; (3) the Android mobile client is synchronous reads and writes two threads, carries out group bag and the decoding of NAL (Network Abstraction Layer) respectively.
Further; Adopt Session Initiation Protocol as the control signaling: the Session Initiation Protocol trestle structure that adopts the standard that the MjSip storehouse realizes defining in the RFC3261 agreement; The SIP session is initiated registration login beginning by the user; Behind the user cipher that sip server success identity SHA1 encrypts, reply the list of devices under the corresponding authority according to the ID in the sip message head of user's requesting service; Mobile client and equipment end are only carried out indirect interaction, and the user can send video request to online equipment through server, replies to the user after equipment end accepts request and sets up the required information of Media Stream.During user's login, mobile client needs timed sending SIP heartbeat packet to carry out session keepalive.
Further again; In the said caching mechanism; Adopt the Real-time Transport Protocol transmitting video data: the video data of equipment end collection is forwarded to mobile client through video server, to the out of order and packet loss phenomenon of the bag of the RTP in the 3G network, and the RTP advanced row cache ordering of client to receiving; Buffer queue adopts java chain sheet form, and each RTP bag is inserted in the buffer queue according to SequenceNumber from small to large.
Further; The read-write thread synchronization is carried out group bag and the decoding of NAL: the NAL buffer area of having opened up a certain size; Write thread and from the RTP buffer memory, extract data successively and carry out the NAL framing, and complete NAL is put into the NAL buffer unit that can write, and buffer unit adds a read lock for this reason; Read thread successively from readable NAL buffer unit reading of data send in the decoder and decode, decoding is only write lock for this buffer unit adds after accomplishing.The read-write thread carries out cycling to the NAL buffer memory, and cross-thread is realized synchronously through above-mentioned lock mechanism and synchronized.
Beneficial effect of the present invention is: through mobile communications network, use the Android portable terminal to carry out real-time video monitoring.
Description of drawings
Fig. 1 is a video monitoring system frame diagram of the present invention.
Fig. 2 is a SIP session flow chart of the present invention.
Fig. 3 logins the mutual sketch map of SIP for user of the present invention.
Fig. 4 is the mutual sketch map of requesting service tabulation SIP of the present invention.
Fig. 5 is the mutual sketch map of request video SIP of the present invention.
Fig. 6 is buffer memory of the present invention and read-write thread sketch map.
Fig. 7 is a NAL group bag flow chart of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is done and to further describe.
With reference to Fig. 1～with 7, a kind of video monitoring based on the Android portable terminal is made up of equipment end, server end and Android portable terminal, be connected through Internet between them, wherein the Android portable terminal inserts Internet through 3G network.Equipment end is responsible for gathering video data, H.264 image compression and the packing of RTP (Real Time Protocol) burst; Server end comprises SIP (Session Initiation Protocol) signal server and video forwarding server; The SIP signal server is mainly managed, is controlled user and equipment through Session Initiation Protocol; The video forwarding server is when the user invites video, to set up RTP simultaneously with equipment end and Android terminal to be connected, and is responsible for video data slave unit end is forwarded to the Android portable terminal; On the Android portable terminal, video monitoring interface the most intuitively is provided for the user; (1) adopt Session Initiation Protocol to carry out alternately between Android mobile client and the SIP signal server; After the user initiates a session request; Use user name and password to register login, logining successfully, the back user can carry out list of devices request, video invitation operations; (2) Android mobile client and video forwarding server adopt the Real-time Transport Protocol transmitting video data; In view of packet packet loss and out of order and cause the phenomenon of picture frame losing may appear in 3G network; Client is not handled when receiving the RTP packet at once, but has adopted caching mechanism; (3) the Android mobile client is synchronous reads and writes two threads, carries out group bag and the decoding of NAL (Network Abstraction Layer) respectively.
Mainly there are two kinds of data flow in the framework of whole video supervisory control system: Media Stream and control information flow (signaling) in the system shown in accompanying drawing 1.Control information flow adopts Session Initiation Protocol, and user and equipment end must be to sip server registration logins, and the Signalling exchange between them need pass through the SIP signal server and transmit, and mainly solves the penetration problem of private network.Media Stream is sent to video server by equipment end, after the video forwarding server is transmitted, arrives the Android mobile client, mainly solves the problem that a plurality of users of equipment watch simultaneously.
SIP is the text based application layer protocol that is similar to HTTP; The present invention adopts the MjSip storehouse to realize the Session Initiation Protocol on the Android mobile client; MjSip is the protocol stack that adopts Java language, the protocol stack architecture of the stratification of the standard that it has realized defining in the RFC3261 agreement.Whole SIP session flow process is shown in accompanying drawing 2, and the SIP Signalling exchange mainly is created in this user action several times:
(a) registration login.Shown in accompanying drawing 3; The user logins when consulting; From header field in the REGISTER message adopts public ID to initiate first step registration earlier; After the SIP signal server is replied ID number of respective user name and is encrypted the seed SEED of usefulness; Program adopts SHA1 (Secure Hash Algorithm) algorithm to handle: SHA1 (SEED+SHA1 (user name password)), and the eap-message digest that obtains is beamed back the SIP signal server as PASSWORD carry out the registration of second step, server is if verify through then logining successfully;
(b) list of devices request.Shown in accompanying drawing 4; The network shooting machine equipment that some is arranged under each user right; The user is after logining successfully, and client can be sent SUBSCRIBE message request list of devices, and the SIP signal server receives the NOTIFY that the request back is replied 200OK and comprised list of devices;
(c) request video.Shown in accompanying drawing 5; When the user clicks online equipment; Client is promptly sent INVITE to the SIP signal server and is invited video, server again with this forwards to equipment end, equipment end is replied 200OK message; Message content has comprised IP and the port numbers and the magic number magic value of video forwarding server, and call back function obtains the content that video activates bag after extracting magic value and processing; The user is if stop to watch video, and client then can be sent BYE message to equipment end, and the announcement apparatus end finishes video Data Transmission.
Provider package in the MjSip storehouse is the relevant class bag of Session Initiation Protocol stack transport layer, and wherein the SipProvider class has realized the transport layer of SIP, is used for sending and receiving sip message.A derived class of SipProvider class that we are newly-built, and in this derived class, made up sip message generating function CreateMessage (), and rewritten the processReceivedMessage () function in the TransportListener interface class.When the terminal need be when sip server sends sip message; Program is called CreateMessage () function earlier; Function generates corresponding sip message according to the parameters of importing into such as type of message, and the SendMessage () function that calls again in the SipProvider class sends.When receiving sip message; The content that program readjustment processReceivedMessage () function comes the treatment S IP message; Android mobile client and SIP signal server interactive messages body are to adopt the XML form; More limited in view of the memory source of portable terminal, we use and obtain required XML node content based on event driven SAX mode during parsing.
Video transmission between Android mobile client and the video forwarding server is based on Real-time Transport Protocol.In order to correct the out of order of RTP bag, the present invention has set up caching mechanism when receiving, in addition, have good real time performance for guaranteeing video monitoring, and open up two threads of read-write and carried out NAL group bag and decoding simultaneously, shown in accompanying drawing 6:
(1) bag of the RTP among the present invention buffer queue adopts Java chain sheet form; Constantly be inserted into the RTP bag of receiving in the buffer queue according to SequenceNumber; RTP bag in the RTP buffer queue all sorted according to SequenceNumber from small to large, corrected out of order in the network.Created two classes of StreamBuf and StreamBufNode among the present invention: the StreamBufNode class definition data structure and the method for operation of RTP buffer memory chained list node; The StreamBuf class definition RTP buffer memory linked list data structure and method of operation, and realized inserting from small to large the method AddToBufBySeq () of chained list node by SequenceNumber.
(2) because there is packet loss in network; In order to prevent the damaged phenomenon that causes decoding to make mistakes of NAL, write thread when the NAL data that from the RTP buffer memory, extract are carried out again framing, taked certain rule; Shown in accompanying drawing 7; If discovery has the packet loss phenomenon then handles as follows: if the RTP bag of losing for the I frame then abandons this frame and this frame all frames afterwards, till next I frame occurs; If the RTP bag of losing for B frame or P frame then directly abandons this frame.Created the Nalbuffer class among the present invention; This class definition the data structure and the method for operation of NAL buffer memory unit; Comprised the read-write indexed variable in its data structure, reading/writing method adds the synchronized keyword and is claimed as method for synchronous, in case any method for synchronous of an instance of a thread entering; Other threads can not get into any other method for synchronous of same instance, guarantee that thus the read-write thread can not clash.In addition, the read-write thread carries out cycling to the NAL buffer memory, realizes communicating by letter of two cross-threads through wait () with notify () method.Write thread and from the RTP buffer memory, extract data successively and carry out the NAL framing, and detect next NAL buffer memory unit and whether can write: if can not write, then call wait () function and get into sleep state, wait the thread that continues to accomplish to call notify () function after the decoding and wake up; If can write, then complete NAL is put into this NAL buffer unit, and this buffer unit is changed to a read states; Equally, whether reading thread, when the NAL buffer unit is operated, also need to detect buffer unit successively readable: if not readable, then call wait () function and get into sleep state, wait thread to be written to accomplish to call notify () function behind the framing and wake up; If readable, then read wherein data and send in the decoder and decode, and this buffer unit is changed to the state of only writing.
The present invention has realized well that on the Android portable terminal private network is to the video transmission of private network and the video monitoring of one-to-many.Platform control signaling adopts Session Initiation Protocol, has reached good user management and equipment and has controlled mechanism; Media video stream adopts Real-time Transport Protocol, and has set up caching mechanism, opens up the read-write thread simultaneously and carries out NAL group bag and decoding, has guaranteed the fluency and the real-time of video pictures to a certain extent.
Claims (4)
1. video monitoring system based on the Android portable terminal; It is characterized in that: said video monitoring system is made up of equipment end, server end and Android portable terminal; Be connected through Internet between them; Wherein the Android portable terminal inserts Internet through 3G network, and wherein equipment end is responsible for gathering video data, H.264 image compression and the packing of RTP burst; Server end comprises SIP signal server and video forwarding server; The SIP signal server is mainly managed, is controlled user and equipment through Session Initiation Protocol; The video forwarding server is when the user invites video, to set up RTP simultaneously with equipment end and Android terminal to be connected, and is responsible for video data slave unit end is forwarded to the Android portable terminal; On the Android portable terminal, the video monitoring interface is provided for the user; Realize following operation on the said Android portable terminal: adopt Session Initiation Protocol to carry out alternately between (1) Android mobile client and the SIP signal server; After the user initiates a session request; Use user name and password to register login, logining successfully, the back user can carry out list of devices request, video invitation operations; (2) Android mobile client and video forwarding server adopt the Real-time Transport Protocol transmitting video data, and client is not handled when receiving the RTP packet at once, but has adopted caching mechanism; (3) the Android mobile client is synchronous reads and writes two threads, carries out group bag and the decoding of NAL respectively.
2. the video monitoring system based on the Android portable terminal according to claim 1; It is characterized in that: adopt Session Initiation Protocol as the control signaling: the Session Initiation Protocol trestle structure that adopts the standard that the MjSip storehouse realizes defining in the RFC3261 agreement; The SIP session is initiated registration login beginning by the user; Behind the user cipher that sip server success identity SHA1 encrypts, reply the list of devices under the corresponding authority according to the ID in the sip message head of user's requesting service; Mobile client and equipment end are only carried out indirect interaction, and the user can send video request to online equipment through server, replies to the user after equipment end accepts request and sets up the required information of Media Stream.During user's login, mobile client needs timed sending SIP heartbeat packet to carry out session keepalive.
3. the video monitoring system based on the Android portable terminal according to claim 1 and 2; It is characterized in that: in the said caching mechanism; Adopt the Real-time Transport Protocol transmitting video data: the video data of equipment end collection is forwarded to mobile client through video server; To the out of order and packet loss phenomenon of the bag of the RTP in the 3G network; The RTP advanced row cache ordering of client to receiving, buffer queue adopts java chain sheet form, and each RTP bag is inserted in the buffer queue according to SequenceNumber from small to large.
4. the video monitoring system based on the Android portable terminal according to claim 1 and 2; It is characterized in that: the read-write thread synchronization is carried out group bag and the decoding of NAL: the NAL buffer area of having opened up a certain size; Writing thread extracts data successively and carries out the NAL framing from the RTP buffer memory; And complete NAL put into the NAL buffer unit that can write, and buffer unit adds a read lock for this reason; Read thread successively from readable NAL buffer unit reading of data send in the decoder and decode, decoding is only write lock for this buffer unit adds after accomplishing.The read-write thread carries out cycling to the NAL buffer memory, and cross-thread is realized synchronously through above-mentioned lock mechanism and synchronized.
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| CN112217862A (en) * | 2020-09-03 | 2021-01-12 | 视联动力信息技术股份有限公司 | Data communication method, device, terminal equipment and storage medium |
| CN112634685A (en) * | 2020-11-24 | 2021-04-09 | 浙江工业大学 | Remote experiment teaching system |
| CN112995426A (en) * | 2021-02-05 | 2021-06-18 | 成都新希望金融信息有限公司 | Outbound call processing method, device, equipment and storage medium |
| CN112995426B (en) * | 2021-02-05 | 2023-01-31 | 成都新希望金融信息有限公司 | Outbound call processing method, device, equipment and storage medium |
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| CN114679574A (en) * | 2022-05-27 | 2022-06-28 | 武汉中科通达高新技术股份有限公司 | Monitoring data distribution method and monitoring data distribution device |
| CN116614599A (en) * | 2023-03-13 | 2023-08-18 | 江西佳信捷电子股份有限公司 | Video monitoring method, device and storage medium for secure encryption |
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