CN111696474A - Multimedia playing method and device, display control card and system and display system - Google Patents
Multimedia playing method and device, display control card and system and display system Download PDFInfo
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- CN111696474A CN111696474A CN201910186200.3A CN201910186200A CN111696474A CN 111696474 A CN111696474 A CN 111696474A CN 201910186200 A CN201910186200 A CN 201910186200A CN 111696474 A CN111696474 A CN 111696474A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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Abstract
The embodiment of the invention discloses a multimedia playing method, a multimedia playing device, a display control card, a display control system and a display system. The multimedia playing method comprises the following steps: analyzing the pixel data at the specified position in the input image frame to be used as a first secret key; verifying the first key by using a preset key to determine the legality of the input image frame; and after the verification is passed, outputting the pixel data of the input image frame and the preset key in a correlated mode. The embodiment of the invention can effectively avoid the situation that the network hacker plays illegal contents after invading the multimedia playing device, and improve the safety and reliability of data transmission and display.
Description
Technical Field
The present invention relates to the field of multimedia playing and displaying technologies, and in particular, to a multimedia playing method, a multimedia playing apparatus, a display control card, a display control system, and a display system.
Background
The operating system installed in the multimedia playing device is typically an Android operating system. The Android operating system is a Linux-based free and open source code operating system, and is widely applied due to low development cost. Although the high openness of the Android operating system brings a relatively high degree of development freedom to research and development work, a hacker can easily invade the Android operating system and control the Android operating system to play illegal contents. In a conventional playing control method of a multimedia playing device, a cloud server issues a playlist encrypted by MD 5. Before playing, the MD5 value of the playlist is checked, and the media corresponding to the playlist can be played only after the check is passed. Even in this way, a hacker can still use other playing software to play illegal videos by directly invading the operating system of the multimedia playing device. Therefore, the conventional playing control method cannot prevent the video source from being outputted from the operating system to the programmable logic device of the multimedia playing apparatus, such as FPGA, and then outputted to the receiving card and displayed on the LED display screen.
Disclosure of Invention
Therefore, the embodiment of the present invention provides a multimedia playing method, a multimedia playing device, a display control card, a display control system and a display system, which effectively avoid the situation that a network hacker plays illegal contents after invading the multimedia playing device, and improve the security and reliability of data transmission and display.
In one aspect, a multimedia playing method provided in an embodiment of the present invention includes: analyzing the pixel data at the specified position in the input image frame to be used as a first secret key; verifying the first key by using a preset key to determine the legality of the input image frame; and after the verification is passed, outputting the pixel data of the input image frame and the preset key in a correlated mode.
In one embodiment of the present invention, the specified position pixel data is pixel data of a single pixel point at a vertex position of a lower left corner of the input image frame and is four bytes of data.
In an embodiment of the present invention, the associating and outputting the pixel data of the input image frame and the preset key specifically includes: outputting field packet data corresponding to the input image frame and including the preset key after outputting the pixel data of the input image frame.
On the other hand, an embodiment of the present invention provides a multimedia playing apparatus, configured to execute the foregoing multimedia playing method, and including: the analysis module is used for analyzing the pixel data at the specified position in the input image frame to be used as a first key; the verification module is used for verifying the first key by using a preset key so as to determine the legality of the input image frame; and the output module is used for associating and outputting the pixel data of the input image frame with the preset key after the verification is passed.
In another aspect, an embodiment of the present invention provides a multimedia playing apparatus, including: the embedded processor stores a first key and comprises a frame buffer; the programmable logic device is connected with the embedded processor; the embedded processor is used for storing an image frame to be output, which comprises pixel data of a target image frame and the first key serving as pixel data of a specified position, in the frame buffer, and outputting the image frame to be output; the programmable logic device is used for analyzing the pixel data at the specified position in the input image frame to be used as a second key, verifying the second key by using a third key to judge whether the input image frame is the image frame to be output and output the pixel data of the target image frame in the input image frame which is the image frame to be output and the second key in a correlation mode after the input image frame passes the verification.
In one embodiment of the present invention, the first key includes four bytes, and the four bytes are used as pixel data of one pixel point in the image frame to be output; the target image frame is smaller than the image frame to be output, and the pixel data at the specified position in the image frame to be output is the pixel data in the area, outside the target image frame, in the image frame to be output.
In an embodiment of the present invention, the associating and outputting the pixel data of the target image frame in the input image frames which are the image frames to be output and the second key specifically includes: outputting field packet data corresponding to the target image frame and including the second key after outputting the pixel data of the target image frame among the input image frames.
In another aspect, an embodiment of the present invention provides a display control card, including: a microcontroller; the second editable logic device is connected with the microcontroller and stores a first key; the second programmable logic device is used for analyzing field packet data corresponding to the received input image frame to obtain a second key under the control of the microcontroller, verifying the second key according to the first key, and outputting pixel data of the input image frame for display after the verification is passed.
In another aspect, an embodiment of the present invention provides a display control system, including: the multimedia playing device as described above; and the display control card is connected with the multimedia playing device.
In another aspect, an embodiment of the present invention provides a display system, including: a display control system as described above; and the LED lamp panel is connected with the display control card of the display control system.
One technical scheme of the technical scheme has the following advantages or beneficial effects: the key is transmitted by using the pixel data at the appointed position in the transmission process of the pixel data of the target image frame, and the predetermined authentication key is used for carrying out two times of authentication to determine the legality of the pixel data of the target image frame, namely, the comparison and the authentication are carried out in each link of the transmission process of the pixel data of the target image frame, so that the data displayed on the LED lamp panel is the image data sent by the multimedia playing device, the condition that illegal contents are played after a network invades the multimedia playing device is effectively avoided, and the safety and the reliability of data transmission and display are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram of a display system according to a first embodiment of the present invention.
Fig. 2 is a schematic diagram of an architecture of the multimedia playing device in fig. 1.
Fig. 3 is a diagram of a frame buffer of the embedded processor of fig. 2.
FIG. 4 is a schematic diagram illustrating an architecture of the display control card of FIG. 1.
Fig. 5 is a flowchart illustrating a multimedia playing method according to a second embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a multimedia playing device according to a third embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
[ first embodiment ] A method for manufacturing a semiconductor device
Referring to fig. 1, a schematic diagram of a display system, such as an LED display system, according to a second embodiment of the present invention is shown. The display system 1 includes, for example: display control system 10 and the LED lamp plate 20 of connecting display control system 10.
Specifically, the display control system 10 herein may be, for example, an LED display control system. The display control system 10 includes: a multimedia playing device (or called sending card, multimedia player) 110 and a display control card (or called receiving card) 120 connected to the multimedia playing device 110. The multimedia playing device 110 analyzes and processes the input video data and then sends the video data to the display control card 120, and the display control card 120 is connected to the LED lamp panel 20 and outputs pixel data to the LED lamp panel 20 for the LED lamp panel 20 to display.
As shown in fig. 2, the multimedia playing apparatus 110 includes, for example, an embedded processor 111 and a programmable logic device 113 connected to the embedded processor 111. The embedded processor 111 includes a frame buffer 1113. Embedded processor 111 has stored on it, for example, key 1111 in one of its registers. The key 1111 is generated by the upper computer screen configuration software, such as LCT software, during screen configuration, and is sent and fixed to the register of the embedded processor 111. Key 1111 is, for example, data comprising four bytes. The frame buffer 1113 is configured to buffer pixel data of an image to be output for one frame of the input image data. The embedded processor 111 extracts pixel data of a frame of target image frame from the input image data in the memory connected to the embedded processor 111 and puts the pixel data into the frame buffer 1113 to obtain an image frame to be output. As shown in fig. 3, the size (resolution) of the image frame to be output is the size of the frame buffer 1113. Therefore, in general, the size of the image frame to be output is larger than the size of the target image frame. The pixel data of a single pixel point in the target image frame includes, for example, A, R, G, B four-channel data, a representing transparency data, R representing red color channel data, G representing green color channel data, and B representing blue color channel data. The value range of each color channel data is 0-255. In addition, the embedded processor 111 also reads the key 1111 from the register, and takes the key 1111 as pixel data of a specified position in the image frame to be output, that is, data of four bytes of the key 1111 as data of four channels of the pixel data of the specified position, respectively. The specified position may be, for example, a pixel point in an area outside the target image frame in the image frame to be output, specifically, a position of a vertex at a lower left corner in the image frame to be output. Of course, the designated position can also be the position of the vertex at the lower right corner in the image frame to be output. Then, the embedded processor 111 outputs the image frame to be output.
The Programmable logic device 113 is, for example, an FPGA (Field-Programmable Gate Array) that receives and analyzes input image pixel data and outputs analyzed image data. After receiving a first input image frame, the programmable logic device 113 first parses pixel data at a specified position in the first input image frame as a first key to be verified. And then, the first to-be-verified key is verified by using the first verification key to determine whether the first input image frame is an image frame to be output by the embedded processor 111. The first authentication key may be key 1111 stored on embedded processor 111 or a key generated by LCT software at the time of screen deployment and fixed to, for example, one of its registers on programmable logic device 113.
When the first to-be-verified key is inconsistent with the first verification key, verification fails, which indicates that the first input image frame is not the to-be-output image frame output by the embedded processor 111, and may be illegal image data invaded and transmitted by a hacker, and at this time, the programmable logic device 113 stops outputting the pixel data of the first input image frame to the display control card 120. When the first to-be-verified key is consistent with the first verification key, verification is passed, which means that the first input image frame is the to-be-output image frame output by the embedded processor 111, and at this time, the programmable logic device 113 places the first verification key in the field packet data. The field packet data is, for example, identification data characterizing the end of transmission of pixel data of the target image frame. One field packet data corresponds to one frame of the target image frame. Then, the programmable logic device 113 associates and outputs the pixel data of the target image frame in the first input image frame, which is the image frame to be output, with the second key, specifically: outputting field packet data corresponding to the target image frame and including the first authentication key after outputting the pixel data of the target image frame in the first input image frame.
As shown in fig. 4, the display control card 120 includes, for example, a microcontroller 121 and a programmable logic device 123 connected to the microcontroller 121. The microcontroller 121 may be, for example, an MCU. A register of programmable logic device 123 has stored therein a key 1231. The key 1231 is also generated by the host computer configuration software, such as LCT software, during configuration, and is fixed in the register of the programmable logic device 123. Here, key 1111 is the same as key 1231. After receiving a second input image frame and field packet data corresponding to the second input image frame, under the control of the microcontroller 121, the programmable logic device 123 parses the field packet data corresponding to the second input image frame to obtain a second key to be verified. The second key to be authenticated is authenticated using key 1231 to determine the legitimacy of the second input image frame.
When the second key to be verified is inconsistent with the key 1231, the verification fails, which indicates that the second input image frame is not the image data output by the programmable logic device 113 of the multimedia playing apparatus 110, and may be illegal data invaded and transmitted by a hacker, and at this time, the programmable logic device 123 stops outputting the received pixel data of the second input image frame to the LED lamp panel 20. When the second key to be verified is consistent with the key 1231, verification is passed, which indicates that the second input image frame is image data output by the programmable logic device 113 of the multimedia playing apparatus 110, and at this time, the programmable logic device 123 outputs pixel data of the second input image frame to the lamp panel 20 for display.
It should be noted here that the key 1111 and the key 1231 may also be different, but during the image data transmission, the key to be verified obtained by performing corresponding processing on the key 1111 is made to be consistent with the key 1231, so as to pass the verification.
In summary, in the embodiment of the present invention, the multimedia playing device and the display control card are subjected to pre-agreement and solidification of the verification keys during screen configuration, and then, in the transmission process of the pixel data of the target image frame, the pixel data at the designated position is used for transmitting the key, and the pre-agreed verification key is used for performing two times of verification to determine the validity of the pixel data of the target image frame, that is, each link in the transmission process of the pixel data of the target image frame is subjected to comparison verification, so as to ensure that the data displayed on the LED lamp panel is the image data sent by the multimedia playing device itself, thereby effectively avoiding the occurrence of the situation that an illegal content is played after a network hacker invades the multimedia playing device, and improving the security and reliability of data transmission and display.
[ second embodiment ]
Referring to fig. 5, a flowchart of a multimedia playing method according to a second embodiment of the present invention is shown. The multimedia playing method of the embodiment of the invention mainly comprises the following steps:
s11: analyzing the pixel data at the specified position in the input image frame to be used as a first secret key;
s13: verifying the first key by using a preset key to determine the legality of the input image frame; and
s15: and after the verification is passed, outputting the pixel data of the input image frame and the preset key in an associated manner.
For the specific implementation process and technical effects of the multimedia playing method in this embodiment, reference is made to the description of the first embodiment, and details are not repeated here.
[ third embodiment ]
Referring to fig. 6, a schematic diagram of an architecture of a multimedia playing device 300 according to a third embodiment of the present invention is shown. The multimedia playing apparatus 300 includes a parsing module 310, a verification module 330, and an output module 350.
The parsing module 310 is configured to parse the pixel data at the specified position in the input image frame to serve as a first key;
a verification module 330, configured to verify the first key by using a preset key to determine validity of the input image frame; and
and an output module 350, configured to output the pixel data of the input image frame and the preset key in an associated manner after the verification passes.
Further, the parsing module 310, the verification module 330 and the output module 350 are integrated into a programmable logic device of the multimedia playing apparatus.
For the specific operation and technical effects of the multimedia playing apparatus 300 in this embodiment, reference is made to the description of the first embodiment, and details are not repeated here.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, a division of a unit is merely a division of one logic function, and an actual implementation may have another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may also be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A multimedia playing method, comprising:
analyzing the pixel data at the specified position in the input image frame to be used as a first secret key;
verifying the first key by using a preset key to determine the legality of the input image frame; and
and after the verification is passed, outputting the pixel data of the input image frame and the preset key in an associated manner.
2. The multimedia playing method according to claim 1, wherein the position-designated pixel data is pixel data of a single pixel point at a vertex position of a lower left corner of the input image frame and is four bytes of data.
3. The multimedia playing method as claimed in claim 1, wherein said associating and outputting the pixel data of the input image frame and the preset key specifically comprises: outputting field packet data corresponding to the input image frame and including the preset key after outputting the pixel data of the input image frame.
4. A multimedia playback apparatus for performing the multimedia playback method of any one of claims 1 to 3, comprising:
the analysis module is used for analyzing the pixel data at the specified position in the input image frame to be used as a first key;
the verification module is used for verifying the first key by using a preset key so as to determine the legality of the input image frame; and
and the output module is used for associating and outputting the pixel data of the input image frame with the preset key after the verification is passed.
5. A multimedia playback apparatus, comprising:
the embedded processor stores a first key and comprises a frame buffer; and
the programmable logic device is connected with the embedded processor;
the embedded processor is used for storing an image frame to be output, which comprises pixel data of a target image frame and the first key serving as pixel data of a specified position, in the frame buffer, and outputting the image frame to be output;
the programmable logic device is used for analyzing the pixel data at the specified position in the input image frame to be used as a second key, verifying the second key by using a third key to judge whether the input image frame is the image frame to be output and output the pixel data of the target image frame in the input image frame which is the image frame to be output and the second key in a correlation mode after the input image frame passes the verification.
6. The multimedia playback apparatus of claim 5, wherein the first key comprises four bytes, and the four bytes are pixel data of one pixel point in the image frame to be output; the target image frame is smaller than the image frame to be output, and the pixel data at the specified position in the image frame to be output is the pixel data in the area, outside the target image frame, in the image frame to be output.
7. The multimedia playing apparatus as claimed in claim 5, wherein the associating and outputting the pixel data of the target image frame and the second key in the input image frames which are the image frames to be output specifically comprises: outputting field packet data corresponding to the target image frame and including the second key after outputting the pixel data of the target image frame among the input image frames.
8. A display control card, comprising:
a microcontroller; and
the second editable logic device is connected with the microcontroller and stores a first secret key;
the second programmable logic device is used for analyzing field packet data corresponding to the received input image frame to obtain a second key under the control of the microcontroller, verifying the second key according to the first key, and outputting pixel data of the input image frame for display after the verification is passed.
9. A display control system, comprising:
the multimedia playing apparatus according to any one of claims 5 to 7; and
the display control card of claim 8, connected to said multimedia player.
10. A display system, comprising:
the display control system of claim 9; and
and the LED lamp panel is connected with the display control card of the display control system.
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Address after: 710075 DEF101, Zero One Square, Xi'an Software Park, No. 72 Zhangbajie Science and Technology Second Road, Xi'an High-tech Zone, Shaanxi Province Applicant after: XI'AN NOVASTAR TECH Co.,Ltd. Address before: 710075 DEF101, Zero One Square, Xi'an Software Park, No. 72 Zhangbajie Science and Technology Second Road, Xi'an High-tech Zone, Shaanxi Province Applicant before: Xi'an NovaStar Tech Co.,Ltd. |
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Application publication date: 20200922 |