CN108881801B - Code stream transmission method, system, electronic equipment and storage medium for video conference - Google Patents
Code stream transmission method, system, electronic equipment and storage medium for video conference Download PDFInfo
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- CN108881801B CN108881801B CN201810703308.0A CN201810703308A CN108881801B CN 108881801 B CN108881801 B CN 108881801B CN 201810703308 A CN201810703308 A CN 201810703308A CN 108881801 B CN108881801 B CN 108881801B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/14—Systems for two-way working
- H04N7/15—Conference systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
- H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
- H04L63/0435—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload wherein the sending and receiving network entities apply symmetric encryption, i.e. same key used for encryption and decryption
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
- H04L9/0838—Key agreement, i.e. key establishment technique in which a shared key is derived by parties as a function of information contributed by, or associated with, each of these
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/234—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs
- H04N21/2347—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving video stream encryption
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
- H04N21/4408—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving video stream encryption, e.g. re-encrypting a decrypted video stream for redistribution in a home network
Abstract
The invention provides a method and a system for transmitting a code stream of a video conference, electronic equipment and a storage medium, wherein the method for transmitting the code stream of the video conference comprises the following steps: the central control terminal negotiates a key with the first video terminal and the second video terminal; a first access module of the central control terminal receives a video code stream from a first video terminal, and the video code stream is encrypted for the first time at the first video terminal according to a negotiated key; a first access module of the central control terminal decrypts the video code stream encrypted for the first time according to the negotiated key; the multimedia processing module of the central control terminal adapts the decrypted video code stream according to the multimedia parameters; the second access module of the central control terminal encrypts the adapted video code stream for the second time according to the negotiated key; and a second access module of the central control terminal sends the video code stream encrypted for the second time to the second video terminal. The method and the equipment provided by the invention reduce the time delay in the video conference.
Description
Technical Field
The invention relates to the field of computer application, in particular to a code stream transmission method, a code stream transmission system, electronic equipment and a storage medium for a video conference.
Background
In a conventional video conference system, when a conference is carried out among multiple parties, an MCU (video conference system central control device) is essentially a multimedia information switch, and performs multi-point calling and connection, thereby implementing functions of video broadcasting, video selection, audio mixing, data broadcasting, and the like, and completing tandem and switching of signals of each terminal.
The MCU is in a media exchange layer in the video conference system and is the core of the whole system. For the central control equipment of the video conference system, the requirements on software and hardware performance are extremely high due to the requirements on the large-capacity code stream data processing and the real-time performance of the video conference. For encrypted conferences, the related services mainly include key exchange and encryption and decryption processes. The traditional video conference model shows that all key exchange and encryption and decryption processing are processed in the media processing module, and the media processing module is responsible for receiving the code stream and performing code stream adaptation or picture synthesis processing according to needs, and meanwhile, the processing of large-capacity encryption and decryption can cause the complexity of executable programs and the cost improvement of host performance, and the problems of video conference delay and the like can be caused.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a code stream transmission method, a system, electronic equipment and a storage medium for a video conference, and reduces the time delay in the video conference.
According to one aspect of the present invention, a method for transmitting a code stream of a video conference is provided, which includes:
the central control terminal negotiates a key with the first video terminal and the second video terminal;
a first access module of a central control terminal receives a video code stream from the first video terminal, and the video code stream is encrypted for the first time at the first video terminal according to a negotiated key;
the first access module of the central control terminal decrypts the video code stream encrypted for the first time according to the negotiated key;
the multimedia processing module of the central control terminal adapts the decrypted video code stream according to multimedia parameters;
the second access module of the central control terminal encrypts the adapted video code stream for the second time according to the negotiated key; and
and a second access module of the central control terminal sends the video code stream encrypted for the second time to the second video terminal.
Optionally, the multimedia parameter is a multimedia playing parameter of the second video terminal.
Optionally, the multimedia parameter is a multimedia playing parameter negotiated by the second video terminal and a platform service module.
Optionally, the multimedia parameter includes a codestream payload type and/or a multimedia resolution.
Optionally, after the multimedia processing module of the central control terminal adapts the decrypted video code stream according to the multimedia parameter, and before the second access module of the central control terminal encrypts the adapted video code stream for the second time according to the negotiated key, the method further includes:
and the forwarding module of the central control terminal forwards the adapted video code stream to one or more second access modules.
Optionally, after the multimedia processing module of the central control terminal adapts the decrypted video code stream according to the multimedia parameter, and before the second access module of the central control terminal encrypts the adapted video code stream for the second time according to the negotiated key, the method further includes:
the multimedia processing module of the central control terminal forwards the adapted video code stream to a code stream retransmission module of the central control terminal;
correspondingly, after the second access module of the central control terminal sends the video code stream encrypted for the second time to the second video terminal, the method includes:
and when the video code stream encrypted for the second time loses packets, retransmitting the video code stream encrypted for the second time by a code stream retransmission module of the central control terminal.
According to another aspect of the present invention, there is also provided a central control terminal, where the central control terminal negotiates with a first video terminal and a second video terminal a secret key, and the central control terminal includes:
a first access module to:
receiving a video code stream from a first video terminal, wherein the video code stream is encrypted for the first time at the first video terminal according to a negotiated key;
decrypting the video code stream encrypted for the first time according to the negotiated key;
the multimedia processing module is used for adapting the decrypted video code stream according to multimedia parameters; a second access module to:
performing second encryption on the adapted video code stream according to the negotiated key; and
and sending the video code stream encrypted for the second time to the second video terminal.
Optionally, the method further comprises:
and the forwarding module is used for forwarding the video code stream after being adapted to one or more second access modules.
Optionally, the method further comprises:
a code stream retransmission module, configured to:
receiving the video code stream which is sent by the multimedia processing module and is adapted;
and when the video code stream encrypted for the second time has packet loss, retransmitting the video code stream encrypted for the second time.
According to another aspect of the present invention, there is also provided a stream transmission system for a video conference, including:
a first video terminal;
a second video terminal; and
a central control terminal configured to perform the steps of:
the central control terminal negotiates a key with the first video terminal and the second video terminal;
a first access module of the central control terminal receives a video code stream from the first video terminal, and the video code stream is encrypted for the first time at the first video terminal according to the negotiated key;
the first access module of the central control terminal decrypts the video code stream encrypted for the first time according to the negotiated key;
the multimedia processing module of the central control terminal adapts the decrypted video code stream according to multimedia parameters;
the second access module of the central control terminal encrypts the adapted video code stream for the second time according to the negotiated key; and
and the second access module of the central control terminal sends the video code stream encrypted for the second time to the second video terminal so that the second video terminal can decrypt and play the video code stream encrypted for the second time according to the negotiated key.
According to still another aspect of the present invention, there is also provided an electronic apparatus, including: a processor; a storage medium having stored thereon a computer program which, when executed by the processor, performs the steps as described above.
According to yet another aspect of the present invention, there is also provided a storage medium having stored thereon a computer program which, when executed by a processor, performs the steps as described above.
Therefore, compared with the prior art, the scheme provided by the invention has the following advantages:
the invention is based on the operation of moving the safety boundary of the central control terminal outwards. The method and the device realize simplified key exchange and achieve the integral performance balance of the central control terminal, so that a multimedia processing module of the central control terminal obtains more performances when performing complex decoding and encoding functions, and solve the problem that a media processing unit needs to perform encryption and decryption operations on each path of audio and video code stream in the prior scheme. Particularly, the real-time performance is better under a large-capacity environment, and the delay is low.
Drawings
The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
Fig. 1 shows a flow chart of a codestream transmission method of a video conference according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a stream transmission system for a video conference according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a stream transmission system for a video conference according to an embodiment of the present invention.
Fig. 4 is a block diagram illustrating a central control terminal according to an embodiment of the present invention.
Fig. 5 is a schematic diagram illustrating module interaction of a central control terminal according to a specific embodiment of the present invention.
Fig. 6 shows a schematic diagram of multimedia parameter negotiation according to an embodiment of the present invention.
Fig. 7 schematically illustrates a computer-readable storage medium in an exemplary embodiment of the disclosure.
Fig. 8 schematically illustrates an electronic device in an exemplary embodiment of the disclosure.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted.
In order to overcome the defects in the prior art, the invention provides a code stream transmission method, a system, electronic equipment and a storage medium for a video conference, and the time delay in the video conference is reduced.
Referring first to fig. 1, fig. 1 shows a flowchart of a codestream transmission method of a video conference according to an embodiment of the present invention. Fig. 1 shows a total of 6 steps:
step S110: the central control terminal negotiates a key with the first video terminal and the second video terminal.
In particular, the present invention may employ symmetric keys. In one embodiment of the present invention, the key exchange may be performed as follows:
under video conferencing (based on H323 protocol), the key agreement procedure is as follows:
the encryption terminal and the decryption terminal (the central control terminal, the first video terminal and the second video terminal can be used as the encryption terminal and can also be used as the decryption terminal) perform DH key negotiation (Diffie-Hellman key exchange) in the transmission process of the code stream, and a shared key is negotiated. The commonly agreed parameters of the DH exchange protocol are as follows: prime p, primitive root g of prime p.
An encryption end: locally generating a secret number a, calculating a secret key K ═ Hamod p, these three parameters p, g, S are put into the message. In order to prevent the message from being tampered with maliciously, the message also contains a signature of the public key parameter.
Decryption end: locally generating a secret number b, calculating a secret key K ═ Sbmod p, put these three parameters p, g, H into the message. In order to prevent the message from being tampered with maliciously, the message also contains a signature of the public key parameter.
Wherein, the key K is Ha mod p＝(gb mod p)a mod p＝(gb)a mod p＝(ga)b mod p＝(gamod p)b mod p＝Sbmod p ═ K ^', this key is the shared key of both parties.
In particular, the negotiation of the encryption algorithm may determine the encryption algorithm with a capability intersection according to the encryption side and the computing capability of the encryption side. The present invention is not limited to this, and the encryption algorithm involved in the present invention may be AES128 or AES 256.
Step S120: and a first access module of the central control terminal receives a video code stream from the first video terminal, and the video code stream is encrypted for the first time at the first video terminal according to the negotiated key.
Step S130: and the first access module of the central control terminal decrypts the video code stream encrypted for the first time according to the negotiated key.
Step S140: and the multimedia processing module of the central control terminal adapts the decrypted video code stream according to multimedia parameters.
In particular, the multimedia parameter may only represent a multimedia playing parameter (i.e. multimedia playing capability) of the second video terminal. The multimedia playing parameters may include a code stream load type, a video resolution, and the like. The second video terminal can register the capability through a second access module described below, so that the multimedia playing parameters of the second video terminal are sent to the multimedia processing module through the second access module and the forwarding module, and the multimedia processing module can adapt the video code stream. The invention is not limited thereto.
In other embodiments, the multimedia parameter may be a multimedia playing parameter (i.e., a multimedia playing capability) negotiated between the second video terminal and a platform service module. Specifically, the second video terminal and the platform service module may register their respective multimedia playing parameters in the second access module, and the second access module may take an intersection of the multimedia playing parameters of the second video terminal and the platform service module, and use the intersection of the multimedia playing parameters as the multimedia parameters, and send the multimedia parameters to the multimedia processing module through the second access module and the forwarding module, so that the multimedia processing module may perform adaptation of the video code stream. Taking the resolution as an example, the resolution allowed by the second video terminal is 360p to 1080p, and the resolution allowed by the platform service module is 360p to 720p, then the second access module takes the intersection 360p to 720p as a multimedia parameter for the multimedia processing module to adapt the video code stream. The above is merely an exemplary illustration of the video stream adaptation method of the present invention, and the present invention is not limited thereto.
Step S150: and a second access module of the central control terminal carries out second encryption on the adapted video code stream according to the negotiated key.
Specifically, in an embodiment of the present invention, after step S140 and before step S150, the method further includes: and the forwarding module of the central control terminal forwards the adapted video code stream to one or more second access modules. Because the central control terminal provided by the invention comprises one or more first access modules and one or more second access modules, the forwarding module is required to perform one-path-to-multiple-path or multiple-path-to-multiple-path video code stream forwarding operation.
Step S160: and a second access module of the central control terminal sends the video code stream encrypted for the second time to the second video terminal.
Specifically, in another embodiment of the present invention, after step S140 and before step S150, the method further includes: and the multimedia processing module of the central control terminal forwards the adapted video code stream to a code stream retransmission module of the central control terminal. Correspondingly, after step S160, the method further includes: and when the video code stream encrypted for the second time loses packets, retransmitting the video code stream encrypted for the second time by a code stream retransmission module of the central control terminal. For example, the code stream retransmission module may send the saved adapted video code stream to the second access module via the multimedia processing module and the forwarding module for retransmission after encryption. The code stream retransmission module may also perform second encryption on the saved adapted video code stream according to the negotiated key, and directly retransmit the video code stream to the second video terminal, which is not limited in the present invention.
The invention realizes the expansion of the encryption boundary to the edge of the central control terminal by the code stream transmission method of the video conference, thereby abandoning the traditional flow of directly encrypting after decryption, picture synthesis or adaptation is carried out on a multimedia processing module (since the multimedia processing module is required to carry out the operation of code stream data, decryption and encryption operation are required to be carried out immediately before and after multimedia processing), adding encryption and decryption functions on a first access module and a second access module, realizing the decryption of video code streams at the first access module, forwarding the video code streams to one or more second access modules through a forwarding module after the multimedia processing module is directly adapted, and carrying out corresponding encryption operation at the second access module so as to share the expense of the multimedia processing module and reduce the code complexity.
Fig. 2 is a schematic diagram of a stream transmission system for a video conference according to an embodiment of the present invention.
The code stream transmission system of the video conference comprises a first video terminal 101, a second video terminal 102 and a central control terminal 103. The first video terminal 101 and the second video terminal 102 join the video conference through the central control terminal 103, and perform interaction of video code streams through the central control terminal 103.
The central control terminal 103 is configured to perform the steps as shown in fig. 1. After the second access module of the central control terminal 103 sends the video code stream encrypted for the second time to the second video terminal 102, the second video terminal 102 decrypts and plays the video code stream encrypted for the second time according to the negotiated key, so as to complete the transmission of the video code stream.
Fig. 2 shows only one first video terminal 101 and one second video terminal 102 for clarity, but the number of the first video terminals 101 and the second video terminals 102 of the present invention is not limited thereto. Specifically, referring to fig. 3, the code stream transmission system of the video conference shown in fig. 3 includes a plurality of first video terminals 101 and a plurality of second video terminals 102, so that the central control terminal 103 realizes the synthesis and adaptation of the multiplexed video code streams. In another embodiment, the stream transmission system of the video conference may include one first video terminal 101 and a plurality of second video terminals 102, so that the central control terminal 103 implements the synthesis and adaptation of the video streams from one channel to multiple channels.
The following describes the central control terminal according to the embodiment of the present invention with reference to fig. 4 and 5. Fig. 4 is a block diagram illustrating a central control terminal according to an embodiment of the present invention. Fig. 5 is a schematic diagram illustrating module interaction of a central control terminal according to a specific embodiment of the present invention.
The central control terminal 200 includes a first access module 201, a multimedia processing module 202 and a second access module 205.
The first access module 201 first receives a video stream from a first video terminal, where the video stream is encrypted for the first time according to a negotiated key at the first video terminal. Then, the first access module 201 decrypts the first encrypted video stream according to the negotiated key, and sends the decrypted video stream to the multimedia processing module 202.
After receiving the decrypted video code stream, the multimedia processing module 202 adapts the decrypted video code stream according to the multimedia parameters.
Then, the second access module 205 performs second encryption on the adapted video code stream according to the negotiated key, and sends the second encrypted video code stream to the second video terminal.
In some embodiments of the present invention, the central control terminal 200 further comprises a forwarding module 203. After the multimedia processing module 202 adapts the decrypted video code stream according to the multimedia parameters, the adapted video code stream is sent to the forwarding module 203, so that the forwarding module 203 forwards the adapted video code stream to one or more second access modules 205, thereby implementing forwarding of a video code stream from one path to multiple paths or from multiple paths to multiple paths.
In some embodiments of the present invention, the central control terminal 200 further includes a code stream retransmission module 204. After the multimedia processing module 202 adapts the decrypted video stream according to the multimedia parameters, the adapted video stream is sent to a stream retransmission module 204. When the video code stream encrypted for the second time loses packets, the video code stream encrypted for the second time is retransmitted by the code stream retransmission module 204. For example, the bitstream retransmission module 204 may send the saved adapted video bitstream to the second access module 205 via the multimedia processing module 202 and the forwarding module 203 for retransmission after encryption. The code stream retransmission module 204 may also perform second encryption on the saved adapted video code stream according to the negotiated key, and directly retransmit the video code stream to the second video terminal, which is not limited in the present invention.
The invention realizes that the encryption boundary is expanded to the edge of the central control terminal through the central control terminal, thereby abandoning the traditional flow of directly encrypting after decryption, picture synthesis or adaptation is carried out on a multimedia processing module (since the multimedia processing module is required to carry out the operation of code stream data, decryption and encryption operation are required to be carried out immediately before and after multimedia processing), adding encryption and decryption functions on a first access module and a second access module, realizing the decryption of video code streams at the first access module, forwarding the video code streams to one or more second access modules through a forwarding module after the multimedia processing module is directly adapted, and carrying out corresponding encryption operation at the second access module so as to share the expense of the multimedia processing module and reduce the code complexity.
In a variation of the above embodiment, referring to fig. 6, fig. 6 shows a schematic diagram of multimedia parameter negotiation according to an embodiment of the present invention. The central control terminal 200 also includes a platform services module 206. The second video terminal 102 and the platform service module 206 may register their respective multimedia playing parameters in the second access module 205, and the second access module 205 takes an intersection of the multimedia playing parameters of the second video terminal 102 and the platform service module 206, and uses the intersection of the multimedia playing parameters as the multimedia parameters, and sends the multimedia playing parameters to the multimedia processing module (e.g., reference numeral 202 in fig. 4) through the forwarding module (e.g., reference numeral 203 in fig. 4) by the second access module 205, so as to allow the multimedia processing module (e.g., reference numeral 202 in fig. 4) to perform adaptation of the video code stream. The above is merely an exemplary illustration of the video stream adaptation method of the present invention, and the present invention is not limited thereto.
Fig. 4 to 6 are block diagrams schematically showing the central control terminal provided by the present invention, and the splitting, merging and adding of the modules are within the protection scope of the present invention without departing from the concept of the present invention.
In an exemplary embodiment of the present disclosure, there is also provided a computer-readable storage medium having stored thereon a computer program which, when executed by, for example, a processor, can implement the steps of the electronic prescription flow processing method described in any one of the above embodiments. In some possible embodiments, aspects of the present invention may also be implemented in the form of a program product comprising program code for causing a terminal device to perform the steps according to various exemplary embodiments of the present invention described in the above-mentioned electronic prescription flow processing method section of this specification, if the program product is run on the terminal device.
Referring to fig. 7, a program product 800 for implementing the above method according to an embodiment of the present invention is described, which may employ a portable compact disc read only memory (CD-ROM) and include program code, and may be run on a terminal device, such as a personal computer. However, the program product of the present invention is not limited in this regard and, in the present document, a readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The program product may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
The computer readable storage medium may include a propagated data signal with readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A readable storage medium may also be any readable medium that is not a readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a readable storage medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the tenant computing device, partly on the tenant device, as a stand-alone software package, partly on the tenant computing device and partly on a remote computing device, or entirely on the remote computing device or server. In the case of remote computing devices, the remote computing devices may be connected to the tenant computing device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device (e.g., through the internet using an internet service provider).
In an exemplary embodiment of the present disclosure, there is also provided an electronic device, which may include a processor, and a memory for storing executable instructions of the processor. Wherein the processor is configured to execute the steps of the electronic prescription flow processing method in any one of the above embodiments via execution of the executable instructions.
As will be appreciated by one skilled in the art, aspects of the present invention may be embodied as a system, method or program product. Thus, various aspects of the invention may be embodied in the form of: an entirely hardware embodiment, an entirely software embodiment (including firmware, microcode, etc.) or an embodiment combining hardware and software aspects that may all generally be referred to herein as a "circuit," module "or" system.
An electronic device 600 according to this embodiment of the invention is described below with reference to fig. 8. The electronic device 600 shown in fig. 8 is only an example, and should not bring any limitation to the functions and the scope of use of the embodiments of the present invention.
As shown in fig. 8, the electronic device 600 is embodied in the form of a general purpose computing device. The components of the electronic device 600 may include, but are not limited to: at least one processing unit 610, at least one storage unit 620, a bus 630 that connects the various system components (including the storage unit 620 and the processing unit 610), a display unit 640, and the like.
Wherein the storage unit stores program code executable by the processing unit 610 to cause the processing unit 610 to perform steps according to various exemplary embodiments of the present invention described in the above-mentioned electronic prescription flow processing method section of the present specification. For example, the processing unit 610 may perform the steps as shown in fig. 1.
The storage unit 620 may include readable media in the form of volatile memory units, such as a random access memory unit (RAM)6201 and/or a cache memory unit 6202, and may further include a read-only memory unit (ROM) 6203.
The memory unit 620 may also include a program/utility 6204 having a set (at least one) of program modules 6205, such program modules 6205 including, but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which, or some combination thereof, may comprise an implementation of a network environment.
The electronic device 600 may also communicate with one or more external devices 700 (e.g., keyboard, pointing device, bluetooth device, etc.), with one or more devices that enable a tenant to interact with the electronic device 600, and/or with any devices (e.g., router, modem, etc.) that enable the electronic device 600 to communicate with one or more other computing devices. Such communication may occur via an input/output (I/O) interface 650. Also, the electronic device 600 may communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network such as the Internet) via the network adapter 660. The network adapter 660 may communicate with other modules of the electronic device 600 via the bus 630. It should be appreciated that although not shown, other hardware and/or software modules may be used in conjunction with the electronic device 600, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, among others.
Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein may be implemented by software, or by software in combination with necessary hardware. Therefore, the technical solution according to the embodiments of the present disclosure may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a usb disk, a removable hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which may be a personal computer, a server, or a network device, etc.) to execute the above-mentioned electronic prescription flow processing method according to the embodiments of the present disclosure.
Therefore, compared with the prior art, the scheme provided by the invention has the following advantages:
the invention is based on the operation of moving the safety boundary of the central control terminal outwards. The method and the device realize simplified key exchange and achieve the integral performance balance of the central control terminal, so that a multimedia processing module of the central control terminal obtains more performances when performing complex decoding and encoding functions, and solve the problem that a media processing unit needs to perform encryption and decryption operations on each path of audio and video code stream in the prior scheme. Particularly, the real-time performance is better under a large-capacity environment, and the delay is low.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
Claims (10)
1. A code stream transmission method of a video conference is characterized in that a central control terminal comprises a first access module, a multimedia processing module and a second access module, and the code stream transmission method of the video conference comprises the following steps:
the central control terminal negotiates a key with the first video terminal and the second video terminal;
a first access module of a central control terminal receives a video code stream from the first video terminal, and the video code stream is encrypted for the first time at the first video terminal according to a negotiated key;
the first access module of the central control terminal decrypts the video code stream encrypted for the first time according to the negotiated key;
the multimedia processing module of the central control terminal adapts the decrypted video code stream according to multimedia parameters;
the second access module of the central control terminal encrypts the adapted video code stream for the second time according to the negotiated key; and
and a second access module of the central control terminal sends the video code stream encrypted for the second time to the second video terminal.
2. The method for streaming video conferencing of claim 1, wherein the multimedia parameter is a multimedia playing parameter of the second video terminal.
3. The method for transmitting codestream of a video conference according to claim 1, wherein the multimedia parameter is a multimedia playing parameter negotiated between the second video terminal and a platform service module.
4. The bitstream transmission method of a video conference according to any one of claims 1 to 3, wherein the multimedia parameters include a bitstream payload type and/or a multimedia resolution.
5. The method for transmitting stream of video conference as claimed in any one of claims 1 to 3, wherein after the multimedia processing module of the central control terminal adapts the decrypted video stream according to multimedia parameters, and before the second access module of the central control terminal encrypts the adapted video stream for the second time according to the negotiated key, the method further comprises:
and the forwarding module of the central control terminal forwards the adapted video code stream to one or more second access modules.
6. The method for transmitting stream of video conference as claimed in any one of claims 1 to 3, wherein after the multimedia processing module of the central control terminal adapts the decrypted video stream according to multimedia parameters, and before the second access module of the central control terminal encrypts the adapted video stream for the second time according to the negotiated key, the method further comprises:
the multimedia processing module of the central control terminal forwards the adapted video code stream to a code stream retransmission module of the central control terminal;
correspondingly, after the second access module of the central control terminal sends the video code stream encrypted for the second time to the second video terminal, the method includes:
and when the video code stream encrypted for the second time loses packets, retransmitting the video code stream encrypted for the second time by a code stream retransmission module of the central control terminal.
7. A central control terminal, wherein the central control terminal negotiates with a first video terminal and a second video terminal for a key, and the central control terminal comprises:
a first access module to:
receiving a video code stream from a first video terminal, wherein the video code stream is encrypted for the first time at the first video terminal according to a negotiated key;
decrypting the video code stream encrypted for the first time according to the negotiated key;
the multimedia processing module is used for adapting the decrypted video code stream according to multimedia parameters;
a second access module to:
performing second encryption on the adapted video code stream according to the negotiated key; and
and sending the video code stream encrypted for the second time to the second video terminal.
8. A system for transmitting a codestream for a video conference, comprising:
a first video terminal;
a second video terminal; and
a central control terminal configured to perform the steps of:
the central control terminal negotiates a key with the first video terminal and the second video terminal;
a first access module of the central control terminal receives a video code stream from the first video terminal, and the video code stream is encrypted for the first time at the first video terminal according to the negotiated key;
the first access module of the central control terminal decrypts the video code stream encrypted for the first time according to the negotiated key;
the multimedia processing module of the central control terminal adapts the decrypted video code stream according to multimedia parameters;
the second access module of the central control terminal encrypts the adapted video code stream for the second time according to the negotiated key; and
and the second access module of the central control terminal sends the video code stream encrypted for the second time to the second video terminal so that the second video terminal can decrypt and play the video code stream encrypted for the second time according to the negotiated key.
9. An electronic device, characterized in that the electronic device comprises:
a processor;
storage medium having stored thereon a computer program which, when executed by the processor, performs the method of any of claims 1 to 6.
10. A computer-readable storage medium, characterized in that the storage medium has stored thereon a computer program which, when being executed by a processor, carries out the method according to any one of claims 1 to 6.
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| CN112104833B (en) * | 2019-10-17 | 2023-01-24 | 越朗信息科技(上海)有限公司 | Audio and video integrated conference system and privacy realization method thereof |
| CN111787271A (en) * | 2020-07-31 | 2020-10-16 | 平安信托有限责任公司 | Video conference control method, device, equipment and computer readable storage medium |
| CN116094714B (en) * | 2023-02-24 | 2023-06-20 | 浙江大华技术股份有限公司 | Code stream encryption and decryption methods, devices, equipment and media |
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| US7822811B2 (en) * | 2006-06-16 | 2010-10-26 | Microsoft Corporation | Performance enhancements for video conferencing |
| CN101420689B (en) * | 2008-11-17 | 2011-02-16 | 宇龙计算机通信科技(深圳)有限公司 | Mobile terminal and method for implementing encoding and decoding process of audio code stream |
| CN102013973A (en) * | 2009-09-08 | 2011-04-13 | 同方股份有限公司 | Encryption and decryption commutator |
| CN102724563A (en) * | 2012-06-15 | 2012-10-10 | 深圳市汇海威视科技有限公司 | Monitoring front end and terminal, monitoring system as well as audio/video signal encryption and decryption methods |
| JP2017183782A (en) * | 2016-03-28 | 2017-10-05 | ルネサスエレクトロニクス株式会社 | Communication apparatus, communication system, and communication method |
| CN207234973U (en) * | 2017-09-01 | 2018-04-13 | 河南腾龙信息工程有限公司 | Video conferencing system based on quantum cryptography |
| CN107948676A (en) * | 2017-12-08 | 2018-04-20 | 苏州科达科技股份有限公司 | Method of transmitting video data and device |
| CN108063911B (en) * | 2017-12-30 | 2022-11-11 | 深圳市潮流网络技术有限公司 | Video conference capacity expansion method |
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