CN103974031A - High-definition streaming media server - Google Patents
High-definition streaming media server Download PDFInfo
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- CN103974031A CN103974031A CN201310041237.XA CN201310041237A CN103974031A CN 103974031 A CN103974031 A CN 103974031A CN 201310041237 A CN201310041237 A CN 201310041237A CN 103974031 A CN103974031 A CN 103974031A
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Abstract
Disclosed is a high-definition streaming media server. An analog video-audio input signal is connected with a video-audio A/D conversion circuit through an interface, an output end of a video A/D conversion circuit is connected to a main chip input port comprising a video-audio coder and a microprocessor, an output end of an audio A/D conversion circuit is connected to a main chip comprising a video-audio coder and a microprocessor, the main chip is connected with an Ethernet controller through an interface, the Ethernet controller is connected with a standard Ethernet through an interface, video data stream is output after being encrypted by the microprocessor, symmetric encryption or a combination of symmetric encryption and asymmetric encryption is adopted as an encryption mode, a microprocessor interface is connected with an audio output interface, a serial interface, a USB (universal serial bus) interface and an alarming interface, the USB interface can be externally connected with a storer like a hard disk and a flash disk, a user is connected to the server through a network client side, the client side can receive realtime video-audio signals after data of the server are decrypted and uncompressed, and the main chip is an MPEG4, MPEG2 and H.264 compression chip and can be 3512, 3516 and 3518.
Description
One, technical field
This patent relates to a kind of high definition stream media server, be a kind of high-definition embedded network streaming media equipment to Audio and Video stream compress-encrypt, be applicable on local area network (LAN) and wide area network the fields such as real-time video monitoring, video conference, tele-medicine long-distance education.
Two, technical background
Streaming media server mainly contains two kinds of implementations at present: based on streaming media server and the flush type stream media server of main frame/PC platform, the video compression of the streaming media server based on main frame/PC platform is mainly completed by streaming media server software, rely on the powerful computing capability of CPU, streaming media server software can obtain very high video compression ratio and powerful video editing function (video clipping, video synthetic etc.).But the shortcoming of the streaming media server based on main frame/PC platform is to be used for indoorly, attacked by internet worm, and therefore the server based on main frame/PC platform needs personal management, is mainly used in the fields such as radio station, interactive television, website.
The video compression of flush type stream media server is mainly completed by high-speed dsp chip or embedded microprocessor, its advantage is that volume is little, low in energy consumption, can not be subject to virus attack, reliability is high, can be used for various adverse circumstances, can realize unattended operation, be especially applicable to field and use.Flush type stream media server is mainly used in video monitoring, video telephone etc. at present.
Flush type stream media server adopts MPEG-4 compressed video signal, MPEG-4, H.264 be the video encoding standard for the mobile communication equipment low rate that real-time Transmission vision signal is formulated on Internet, high compression ratio, MPEG-4, H.264 adopt interframe compression, only store differentiated place between successive frame, can reach larger compression ratio.MPEG-4, H.264 adopt OO compress mode, be different from MPEG-1 and MPEG-2, MPEG-4, H.264 be not simply picture breakdown to be become each imaging blocks to compress, but first by the object in image (as people, thing) with background separation out, carry out respectively in frame and interframe encode for different objects, allow different object flexible allocation code checks simultaneously, to the more multibyte coding of important information distribution, the coding of the less important less byte of information distribution, therefore can, in realizing high compression ratio, obtain less distortion.
Along with the distribution of Intemet is more and more extensive, safety problem also becomes increasingly conspicuous, and the demand that protection transmits data is also more and more stronger.The for example higher video/audio of some security requirements, as momentous conference, monitoring place and medical treatment etc., if it is not encrypted, once stolen or be modified, consequence will be very serious.
Information encryption is divided into two classes: i.e. symmetric cryptography and asymmetric encryption.
(1) symmetric cryptosystem
In symmetric cryptosystem, the encryption and decryption of information are all used to identical key, that is to say and open different locks with different keys.This encryption method can be simplified encryption process, and information exchange both sides needn't study and exchange special cryptographic algorithm each other.If do not revealed at switching phase private cipher key, confidentiality and message integrality just can be ensured so.Symmetric cryptosystem also comes with some shortcomings, if exchange one side has N exchangeable object, he will safeguard N private cipher key so, another problem that symmetric cryptography exists is that both sides share one private cipher key, and any information of exchange both sides is all by sending the other side to after this secret key encryption.
(2) asymmetric encryption techniques
In asymmetric encryption system, key is broken down into a pair of (being public-key cryptography and private cipher key).This can serve as public-key cryptography (encryption key) by unclassified mode to other people openly to any handle in key, and another is preserved as private cipher key (decruption key).Public-key cryptography is for encrypting, and private cipher key is for deciphering, and private cipher key can only have the exchange side that generates key to grasp, and public-key cryptography can extensively be announced, but it is only corresponding to the exchange side that generates key.Asymmetric encryption mode can make communicating pair need not exchange in advance key just can set up secure communication, is widely used in the information exchange such as authentication, digital signature field.Asymmetric encryption system is to be generally based upon on some known difficult math question, is the inevitable outcome of computer complexity theory development.
Three, summary of the invention
(1) goal of the invention
The object of this invention is to provide a kind of high definition stream media server, it can also not encrypt high definition transmission to being encrypted depending on, audio stream, to ensure transmitting depending on, audio-frequency information safety on network.
(2) technical scheme
The compression that flush type stream media server comprises video/audio signal and the large function of embedded web server two, video input mouth input analog video signal, can connect the video output terminals such as common camera, VCD/VCR/DVD player; Audio frequency is transmitted in both directions, can connect microphone and earphone (can realize IP phone); The RS-232 data channel of full duplex can be used for transfer of data and control.The IP address of Web server can arrange, and can control video encode stream, allows many people to access simultaneously, can on network, realize multicast and broadcast.
Flush type stream media server, compresses (MPEG4, MPEG2 by Efficient Compression chip after the video signal digitization that video camera is sent here, H264, MJEPG), deliver to built-in embedded server by internal bus, then the video-voice frequency flow of compression is encrypted.In the time that user watches by browser, client after deciphering, decompress(ion), makes user can watch real-time video image the data that receive from network, and authorized user can also be controlled the action of video camera, The Cloud Terrace, camera lens or system configuration is operated.There is full-duplex audio transmission simultaneously, transparent full duplex RS-232 data channel, warning function. owing to video/audio/data compression being focused in the equipment that volume is very little, can directly be connected into local area network (LAN) and wide area network, reach and insert and see, save the cable of Various Complex, when installation, only need to arrange an IP address, user also, without any hardware device is installed, only can watch with browser.
Accompanying drawing 1 is shown in by scheme block diagram.
Can adopt some ripe symmetric encipherment algorithms depending on one of encryption method of, audio stream, as DES, 3DES, RC5 etc. are encrypted the video-voice frequency flow data of compression.Symmetric cryptography has adopted symmetric cryptography coding techniques, and its feature is that data encryption is conciliate secret emissary with identical key, and encryption key also can be used as decruption key.
After adopting asymmetric key algorithm encrypted symmetric key depending on two of the encryption method of, audio stream, transmit, different from symmetric encipherment algorithm, rivest, shamir, adelman needs two keys: public-key cryptography (Public Key) and private cipher key (Private Key).Public-key cryptography and private cipher key are a pair of, if data are encrypted with public-key cryptography, only have and could decipher with corresponding private cipher key; If data are encrypted with private cipher key, only have and could decipher with corresponding public-key cryptography.
(3) technique effect
The collection compression that flush type stream media server comprises video/audio signal and the large function of embedded web server two, video input is analog signal, can connect common simulation camera, television set, DVD player etc.; Audio two-way transmission, can connect microphone and earphone.Can realize IP phone function by streaming media server.The webserver is embodied in and allows network client to watch the video image on streaming media server by browser, the audio signal on playing stream media server.Streaming media server allows many people to access simultaneously, can on network, realize multicast and broadcast.The feature of streaming media server is: (1) wide scope of deploying to ensure effective monitoring and control of illegal activities, can use ready-made computer network transmission video signal, and there is no the restriction of length of cable and signal attenuation; (2) extended capability is strong, and all devices is with IP address designation, and increase equipment just means increases IP address; (3) can form multilayer remote control network, the vision signal after digitlization by unified procotol in transmission over networks, can spanning gateway, across router remote transmission video.
Four, brief description of the drawings
Accompanying drawing 1 is this flush type stream media server technical scheme block diagram.
Accompanying drawing 2 is this flush type stream media server embodiment mono-block diagrams.
Five, embodiment
Embodiment mono-:
Below in conjunction with accompanying drawing 2, embodiments of the present invention is further illustrated.
This streaming media server, is a system based on ARM microprocessor, and it has powerful function, provides numerous interfaces to use to client.Vision signal is through special video a/d, video coding chip, arm processor, Ethernet interface access network based on ethernet.The analog video image obtaining by the simulation video camera of far-end is inputted professional video signal preprocessor SAA7113 (Video processing A/D) and completes with PAL or NTSC form the A/D conversion output digital video signal of Dui Yi road analog video, this unit first carries out clamped, amplification and filtering to analog video signal, removes the noise jamming of signal.Signal after purification is converted into digital video signal through A/D.Digital video is carried out Y, UV through Y/C separation control circuit and is separated.Y, UV signal after separation enter respectively brightness and chroma control circuit, and the signal of brightness and colourity is enhanced and weakens according to user preset value.Through the YUV signal of brightness and colourity processing in video decode circuit, be converted to can compressed coding unit processing CCIR-601 normal video data flow.Simulated audio signal is inputted professional audio signal processor UDA136ITS (audio frequency process A/D) and completes the A/D conversion outputting digital audio signal of a road analogue audio frequency.
Normal video data flow is carried out efficiently compressed encoding fast by video encoder GO7007SB, compressed format can be MPEG1, MPEG2, MPEG4, H.264, GoStream format, user sets as required voluntarily, to meet the requirement that different clients are different.GO7007SB is a high efficiency, H.D integrated chip, can be to the contrast of image, brightness, and colourity is controlled, and in the process of coding, realizes estimation, motion compensation, DCT, IDCT, quantification and inverse quantization and variable-length encoding.Can export the picture of DVD quality, and under low speed bandwidth, have the high-quality QCIF format-pattern of 40Kbps.And it also has oneself USB interface and HPI interface: can directly control GO7007SB by USB; Carry out communication and transfer of data by HPI interface and ARM microprocessor S3C2510X.For efficient transmitting image, the buffer memory of GO7007SB is an external high-speed register MT48LC2M32B2SDRAM (register 1) carries out image, carries out transfer of data by DMA, has saved resource to carry out more efficiently data encoding.Be transmitted to microprocessor S3C2510X (microprocessor) through the digital video signal of overcompression.
Simulation video and audio input signal is connected with video and audio A/D change-over circuit through interface, the output of video a/d change-over circuit is connected to the master chip input port that comprises video encoding and microprocessor, the output of audio A/D change-over circuit is connected to the master chip that comprises video encoding and microprocessor, this master chip is connected with ethernet controller by interface, and ethernet controller is connected with standard ethernet by interface.Wherein video data stream is output after microprocessor is encrypted.Cipher mode adopts symmetric cryptography or symmetric cryptography and asymmetric encryption to combination.Microprocessor Interface is connected with audio output interface, serial line interface, USB interface and remote alarm interface, USB interface can external memorizer as hard disk, flash memory disk etc.User is connected to this server by networking client, and the data of server are after deciphering, decompress(ion), and client can be received real-time video/audio signal.Master chip used is MPEG4, MPEG2, compression chip H.264, and master chip can be 3512,3516,3518.
The present embodiment adopts symmetric cryptography to combine data stream is encrypted with asymmetric encryption.Use symmetric encipherment algorithm to be encrypted video-voice frequency flow, then with rivest, shamir, adelman, the key of symmetric encipherment algorithm is encrypted.Symmetric cryptography has adopted symmetric cryptography coding techniques, and its feature is that data encryption is conciliate secret emissary with identical key, and encryption key also can be used as decruption key.The speed that this symmetry is encrypted is quite fast, is applicable to the encryption of large data flow.Asymmetric encryption is the method that uses a pair of asymmetrical password encryption or deciphering.Every a pair of password is made up of PKI and private key.PKI is extensively issued.Private key is hidden close, underground.Be merely able to be deciphered by private key by the data of public key encryption.Conversely, use the data of encrypted private key to decipher with PKI.This asymmetrical characteristic makes PKI of great use close.
Being described below of RSA Algorithm:
Public-key cryptography: n=pq (p, q are respectively the large prime number of two inequalities, and p, q must maintain secrecy)
E and (p-1) (q-1) are coprime
Private cipher key: d=e-1{mod (p-1) (q-1) }
Encrypt: (n), wherein m is that expressly c is ciphertext to mod to c=me.
Deciphering: (mod n) for m=cd
Microprocessor S2C2510X is a low-power consumption, and the microprocessor of high performance 16/32 risc architecture is specially for example, for Ethernet system development: soho router, INTERNET GATEWAY, WLAN AP etc.There is special Ethernet interface to be connected with Ethernet by network adapter RTL8201BL.And S3C2510X has also been equipped with network interface, audio frequency output, serial line interface, USB interface etc., video flowing can be stored on external memory by USB interface, for example hard disk or the flash memory disk etc. with USB interface, the whole stream media server system making has had powerful interface system.Can also define special interface reports to the police.AM29LV320DB-90E1 (flash memory) is the FLASH MEMORY of, and its effect is a program storage, and start-up routine, configurator and the embedded system of system are all stored in this.MT48LC4M32B2TG (register 2) is a data storage, and it is the workplace of ARM microprocessor, the program that microprocessor will be carried out, and the data of processing all can be temporarily stored in here.EMP3032 (logic chip) is a PLD chip, and its effect is to provide various logic to circuit, has secret effect simultaneously.RTL8021BL supports 10/100Mbps, half-duplex/full duplex, defers to IEEE802.3 and IEEE802.3U agreement, supports twisted-pair feeder and optical fiber output.Microprocessor internal has moved real time operating system embedded embedded web server, like this, arbitrary main frame on Ethernet can run on the vision signal that the Web Server in microprocessor checks input by the protocol access such as TCP, UDP, but also can be by network to the control of microprocessor task-cycle, as control the rotation of The Cloud Terrace, the speed of transmitting image, the quality of transmitting image etc.
Embodiment bis-:
Identical in the connection of the present embodiment hardware and embodiment mono-, different is to looking, audio stream encryption method.The present embodiment adopts symmetric cryptography, in microprocessor, video/audio data flow is carried out to symmetric encipherment algorithm, as DES, 3DES, RC5 etc. are encrypted the video-voice frequency flow data of compression.Symmetric cryptography has adopted symmetric cryptography coding techniques, and its feature is that data encryption is conciliate secret emissary with identical key, and encryption key also can be used as decruption key.
Claims (3)
1. a high definition stream media server, it is characterized in that: simulation video and audio input signal is connected with video and audio A/D change-over circuit through interface, the output of video a/d change-over circuit is connected to the master chip input port that comprises video encoding and microprocessor, the output of audio A/D change-over circuit is connected to the master chip that comprises video encoding and microprocessor, this master chip is connected with ethernet controller by interface, and ethernet controller is connected with standard ethernet by interface.
2. the flush type stream media server of information security according to claim 1, is characterized in that: video data stream is encrypted through the mode of symmetric cryptography and asymmetric encryption combination.
3. the flush type stream media server of information security according to claim 1, is characterized in that: master chip used is MPEG4, MPEG2, compression chip H.264;
Or preferred, described master chip is 3512,3516,3518.
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| CN201310041237.XA CN103974031A (en) | 2013-02-01 | 2013-02-01 | High-definition streaming media server |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107197287A (en) * | 2017-05-24 | 2017-09-22 | 福州瑞芯微电子股份有限公司 | A kind of video recorded broadcast method and apparatus based on arm processors |
| CN107682675A (en) * | 2017-10-19 | 2018-02-09 | 佛山市章扬科技有限公司 | A kind of method using a variety of compress mode recorded videos |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107197287A (en) * | 2017-05-24 | 2017-09-22 | 福州瑞芯微电子股份有限公司 | A kind of video recorded broadcast method and apparatus based on arm processors |
| CN107682675A (en) * | 2017-10-19 | 2018-02-09 | 佛山市章扬科技有限公司 | A kind of method using a variety of compress mode recorded videos |
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Application publication date: 20140806 |