CN109040836B - Method and device for analyzing ARINC818 protocol video stream - Google Patents
Method and device for analyzing ARINC818 protocol video stream Download PDFInfo
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- CN109040836B CN109040836B CN201810731877.6A CN201810731877A CN109040836B CN 109040836 B CN109040836 B CN 109040836B CN 201810731877 A CN201810731877 A CN 201810731877A CN 109040836 B CN109040836 B CN 109040836B
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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
- H04N21/44008—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 operations for analysing video streams, e.g. detecting features or characteristics in the video stream
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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]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/643—Communication protocols
Abstract
The invention relates to an analysis method and a device of ARINC818 protocol video stream, the device comprises a parameter configuration module, a configuration register and a video frame analysis module, wherein the parameter configuration module is used for receiving parameters configured by a sending end according to the resolution and the transmission speed of a video to be transmitted, and the parameters comprise the length of a data area, the number of data packets and the number of interval clock cycles between data frames; the configuration register is used for storing parameters; the video frame analysis module is used for counting the length of the data area of the data frame in the video frame by using the parameters in the configuration register and taking out the video data payload. The invention can analyze ARINC818 video frames with various transmission rates, various resolutions and various frame rates in real time, and can configure parameters in real time to adapt to the video frames with different parameters without regenerating logic design.
Description
Technical Field
The invention belongs to the field of computer network communication, and particularly relates to a method and a device for analyzing ARINC818 protocol video stream.
Background
The ARINC818 protocol is a special image transmission protocol for avionics systems based on FC-AV protocol, called as Avionics Digital Video Bus (ADVB), and is used for solving the problem of remote transmission and display of system images of multifunctional displays, helmet displays and the like after the display mode of the integrated avionics system is changed, and belongs to a novel airborne communication protocol.
According to the Arinc818 protocol, videos with different resolutions and different transmission rates need to use different transmission time sequences in the transmission process, so that a sending end or a receiving end both need to accord with the time sequence parameters, and the existing device only analyzes the video stream aiming at the time sequence parameters under a certain resolution and a certain transmission rate, namely fixed parameter analysis, and cannot realize real-time analysis of the video stream.
Disclosure of Invention
The invention aims to provide a method and a device for analyzing ARINC818 protocol video streams, which are used for solving the problem that the prior art cannot analyze video streams with different resolutions or different transmission rates in real time.
In order to solve the above technical problem, the present invention provides an analysis method for ARINC818 protocol video stream, which includes the following steps:
1) receiving parameters configured by a sending end according to the resolution and the transmission speed of a video to be transmitted, wherein the parameters comprise the length of a data area, the number of data packets and the number of interval clock cycles between data frames, and writing the parameters into a configuration register;
2) and counting the length of the data area of the data frame in the video frame by using the parameters in the configuration register, and taking out the payload of the video data to realize the analysis of the video to be transmitted.
According to the requirements of different resolutions and/or different transmission rates, the parameters of the video to be transmitted are configured and written into the configuration register, and the payload of the video data is taken out by counting the length of the data area of the data frame in the video frame, so that the analysis of the video to be transmitted with different resolutions or different transmission rates is realized.
Further, the parsing step of each video frame is as follows:
2-1) judging the initial character of the video frame;
2-2) when the initial character of the video frame is the SOFI, counting and analyzing the video frame by using the frame header length and the data area length of the zeroth frame, and taking out the payload of the video data;
2-3) when the initial character of the video frame is the SOFn, counting and analyzing the video frame by using the frame header length and the data area length of the data frame, and extracting the video data payload.
Further, when the start character of the video frame is neither SOFi nor SOFn, the next video frame is waited for judgment.
Further, when the resolution of the video to be transmitted is unchanged and the transmission rate is changed, only the number of interval clock cycles between the data frames written into the configuration register is changed; all parameters written to the configuration registers are changed when the resolution of the video to be transmitted changes.
Further, the parameters are written to the configuration register through the AHB bus or the AXI bus.
In order to solve the above technical problem, the present invention further provides a device for parsing a video stream in ARINC818 protocol, including the following device schemes:
the device comprises a parameter configuration module, a configuration register and a video frame analysis module, wherein the parameter configuration module is used for receiving parameters configured by a sending end according to the resolution and the transmission speed of a video to be transmitted, and the parameters comprise the length of a data area, the number of data packets and the number of interval clock cycles between data frames; the configuration register is used for storing the parameters; the video frame analysis module is used for counting the length of a data area of a data frame in the video frame by using the parameters in the configuration register, and taking out a video data payload to realize the analysis of the video to be transmitted.
According to the requirements of different resolutions and/or different transmission rates, the parameters of the video to be transmitted are configured and written into the configuration register, and the payload of the video data is taken out by counting the length of the data area of the data frame in the video frame, so that the analysis of the video to be transmitted with different resolutions or different transmission rates is realized.
Further, the parsing step of each video frame is as follows:
(1) judging the initial character of the video frame;
(2) when the initial character of the video frame is the SOFI, counting and analyzing the video frame by using the frame header length and the data area length of the zeroth frame, and taking out the payload of the video data;
(3) when the initial character of the video frame is the SOFn, counting and analyzing the video frame by using the frame header length and the data area length of the data frame, and extracting the video data payload.
Further, when the start character of the video frame is neither SOFi nor SOFn, the next video frame is waited for judgment.
Further, when the resolution of the video to be transmitted is unchanged and the transmission rate is changed, only the number of interval clock cycles between the data frames written into the configuration register is changed; all parameters written to the configuration registers are changed when the resolution of the video to be transmitted changes.
Further, the present invention writes the parameters to the configuration register through the AHB bus or the AXI bus.
Drawings
FIG. 1 is a flow chart of video frame parsing in ARINC818 protocol;
fig. 2 is a block diagram of a video frame parsing logic structure of ARINC818 protocol.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
The first embodiment is as follows:
in order to be able to parse video streams with different resolutions and different transmission rates, the parsing method of the ARINC818 protocol video stream of the present invention comprises the following steps:
1) receiving parameters configured by a sending end according to the resolution and the transmission speed of a video to be transmitted, wherein the parameters comprise the length of a data area, the number of data packets and the number of interval clock cycles between data frames, and writing the parameters into a configuration register through an AHB bus or an AXI bus.
2) And counting the length of the data area of the data frame in the video frame by using the parameters in the configuration register, and taking out the payload of the video data to realize the analysis of the video to be transmitted.
According to the requirements of different resolutions and/or different transmission rates, the parameters of the video to be transmitted are configured and written into the configuration register, and the payload of the video data is taken out by counting the length of the data area of the data frame in the video frame, so that the analysis of the video to be transmitted with different resolutions or different transmission rates is realized.
The sub-step of parsing each video frame in the step 2) is as follows:
2-1) judging the initial character of the video frame;
2-2) when the initial character of the video frame is the SOFI, counting and analyzing the video frame by using the frame header length and the data area length of the zeroth frame, and taking out the payload of the video data;
2-3) when the initial character of the video frame is the SOFn, counting and analyzing the video frame by using the frame header length and the data area length of the data frame, and extracting the video data payload.
And when the initial character of the video frame is neither the SOFI nor the SOFn, waiting for the next video frame, and continuing judging according to the analysis substep.
For example, a video stream with a resolution of 1280X1024, a frame rate of 60 frames/second, and a transmission rate of 1.0625Gbps is transmitted using ARINC818, and the parameters are fixed by calculation, for example, an image is divided into 2049 ARINC818 frames for transmission, wherein the zeroth frame is the container header of the image, and the remaining 2048 frames are data frames. The length of the container header frame is 35 clock cycles, wherein the length of the container header frame is 6 clock cycles, and the length of the data area is 26 clock cycles. The header of the common data area is 6 clock cycles, and the length of the data area is 480 clock cycles.
For the above example, the meaning of step 2-2) is to count by using the frame header length 6 of the zeroth frame, enter the data area to count after the frame header is over, and count and analyze by using the parameter 26. The meaning of step 2-3) is that when the remaining 2048 data frames are analyzed, parameters of a frame header of 6 and a data area of 480 clock cycles are used for counting and analyzing.
The video payload data of the present invention is the data that needs to be displayed in one image. For example, an image resolution is 1280x1024, then there are 1280x1024 points in the image, each point is a 24bit data, and the video payload data refers to the data at these points.
The above steps of configuring parameters use a software driven CPU to write the configuration parameters into the configuration register through a bus, such as an AHB bus, but not limited to the AHB bus, and other buses such as an AXI bus may also be used.
The process of configuring the parameters specifically comprises the following steps:
the parameters of the selected configuration include the total number of packets in a video frame, a packet length, the number of GAP clocks GAP1 between the first frame FC0 and the second frame FC1 of the video data frame, the number of GAP clocks GAP2 between the nth frame and the N +1 th frame, and the number of GAP clocks GAP3 between the last frame and the first frame FC0 of the next video data frame.
And writing the configured parameters into a configuration register as an analysis basis of the video to be transmitted. When the resolution is not changed and only the transmission rate is changed, the parameters to be changed are the above-mentioned GAP1, GAP2 and GAP 3; when the resolution changes, the above 5 parameters may need to be changed, regardless of whether the transmission rate changes.
The specific solving process of the configuration parameters is as follows;
the number of data packets is equal to the number of image resolution lines multiplied by 2; the number 2 is the number of data packets divided by each line of images;
the packet length is equal to the number of image resolution lines × 0.75; the number 0.75 is the amount of data per pixel in terms of color information, such as: black and white 1, RGB \ YUV444 — 3, divided by the amount of data transferred per clock cycle 4;
the intermediate value TMP [ line transmission rate ÷ (image resolution line number +36) ÷ frame frequency ÷ 40 ]; numeral 36 is 36 lines of front and back blanking of the image, numeral 40 is the data volume 4B transmitted in each clock cycle, and the bit number is encoded by 8B 10B;
GAP 1-TMP × 4-video data frame FC0 length; number 4 is the number of blanking lines after the image;
GAP2 ═ TMP ÷ 2-video data frame FCN length; the number 2 is the number of data packets divided by each line of images;
GAP3 ═ TMP 32+ GAP 2; numeral 32 is the number of pre-picture blanking lines.
For example, when the resolution of the transmission video is 1280 × 1024, the line transmission rate is 3.1875Gbps, and the remaining parameters are in 24-bit RGB format, and the frame rate is 60 frames/second. According to a specific ARINC818 timing calculation tool, the above 5 parameters to be configured are:
total number of packets in a video frame: 2049 of the total nutrient solution;
one packet length: 489 × 4 bytes;
GAP1：4973；
GAP2：137；
GAP3：40201。
when the line transmission rate is changed to 4.25Gbps and the remaining parameters are not changed, only the parameters GAP1, GAP2, and GAP3 among the above 5 parameters need to be changed as follows:
GAP1：6680；
GAP2：346；
GAP3：53786。
when the line transmission rate is changed to 4.25Gbps, the resolution is changed to 768 × 615, and the remaining parameters are not changed, the above 5 parameters are changed as follows:
total number of packets in a video frame: 1231, the number of the active ingredients is 1231;
one packet length: 297x4 bytes;
GAP1：10880；
GAP2：1063；
GAP3：88103。
in the process of configuring parameters, when the resolution of a video to be transmitted is unchanged and the transmission rate is changed, only the number of interval clock cycles between data frames written into a configuration register is changed; all parameters written to the configuration registers are changed when the resolution of the video to be transmitted changes.
The invention also provides an analysis device of the ARINC818 protocol video stream, which comprises a parameter configuration module, a configuration register and a video frame analysis module, wherein the parameter configuration module is used for receiving parameters configured by the sending end according to the resolution and the transmission speed of the video to be transmitted, and the parameters comprise the length of a data area, the number of data packets and the number of interval clock cycles between data frames; the configuration register is used for storing parameters; the video frame analysis module is used for counting the length of a data area of a data frame in the video frame by using the parameters in the configuration register, and taking out a video data payload to realize the analysis of the video to be transmitted.
The resolution device of the ARINC818 protocol video stream referred to in the above embodiments is actually a computer solution based on the method flow of the present invention, that is, a software framework, and can be applied to a computer, and the above device is a processing process corresponding to the method flow. The above-described method will not be described in detail since it is sufficiently clear and complete.
Example two:
in order to realize the analysis of video streams with various transmission rates, various video resolutions and various frame rates which conform to the ARINC818 protocol format, take out video payload data in the video streams, and can program in real time and modify configuration data so as to adapt to different requirements, the invention provides an ARINC818 protocol video stream analysis device which comprises bus interface writing logic, a parameter configuration register and ARINC818 video frame analysis logic which are sequentially connected. The bus interface write-in logic is used for configuring parameters of the video stream to be transmitted and writing the configuration parameters into a parameter configuration register through an AHB (advanced high-performance bus); the parameter configuration register is used for storing configuration parameters; ARINC818 video frame parsing logic is configured to count data region lengths of data frames in the video frames according to the configuration parameters and extract video data payloads.
By programming different configuration parameters, the video stream of ARINC818 protocol with different rates and different resolutions is analyzed by adopting the following method, as shown in FIG. 1:
1) the logic circuit determines whether a new ARINC818 video frame or the beginning of a data frame in an original video frame based on the input characters;
2) if the input character is the start character SOFI of the ARINC818 video frame, which indicates that a new video frame starts, counting the video frame by using the frame header length parameter of the zeroth frame, entering the data area of the zeroth frame after the frame header is finished, counting by using the data area length parameter of the zeroth frame, and after the frame header is finished, switching the state to the start state;
3) if the input character is the initial character SOFn of the ARINC818 data frame, which indicates that the original video frame is not finished and is the start of a certain data frame, counting the frame head and the data area of the data frame by using the corresponding parameters of the data frame, and after the end, switching the state into a start initial state;
4) if the input character is not SOFi or SOFn but other data, the system still returns to the start state and waits for a new data frame or video frame.
Specific logic circuitry the figure is shown in fig. 2, which shows the various functional blocks and data flow directions of the system parsing video streams of ARINC818 protocol at various rates and resolutions. After the configuration parameters are written into the configuration register through the AHB bus, the analysis function of the circuit is started. When the video stream of the ARINC818 protocol flows in, the video payload data is analyzed in real time through the flow of the method, and can be directly displayed or subjected to subsequent data processing.
The invention uses software programming, writes into configuration registers, changes ARINC818 video frame parameters, such as the number of data frames contained in an ARINC818 video frame, the length of each data frame and other parameters. By writing different parameters, the ARINC818 video frame receiving and parsing device can be enabled to parse a plurality of transmission rates, a plurality of video resolutions and a plurality of video frame rates. Various transmission rates, such as 1.0625Gbps, 2.125Gbps, 3.1875Gbps, and the like. Various video resolutions, such as 1920 × 1080, 1280 × 1024, 1280 × 720, 640 × 480, 720 × 576, and the like. Various frame rates, such as 60 frames/second, 50 frames/second, 30 frames/second, 24 frames/second, etc.
The method and the device can analyze the ARINC818 video frames with various transmission rates, various resolutions and various frame rates in real time, and can configure analysis parameters in real time to adapt to the video frames with different parameters without regenerating logic design.
The data bus in this embodiment is preferably an AHB bus, and as another implementation, the data bus may also be another bus in the prior art, such as an AXI bus, an Avalon bus, and the like, which is not described in detail herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. A method for parsing ARINC818 protocol video stream is characterized by comprising the following steps:
1) receiving parameters configured by a sending end according to the resolution and the transmission speed of a video to be transmitted, wherein the parameters comprise the length of a data area, the number of data packets and the number of interval clock cycles between data frames, and the length of the data area is the number of clock cycles used for transmitting effective data in the video frames; the number of the data packets is the total number of the data packets in the video frame; the number of interval clock cycles between the data frames comprises the number of interval clocks between a first frame and a second frame of a video data frame, the number of interval clocks between an Nth frame and an N +1 th frame, and the number of interval clocks between a last frame and a first frame of a next video data frame; writing the parameter to a configuration register;
2) and counting the length of the data area of the data frame in the video frame by using the parameters in the configuration register, and taking out the payload of the video data to realize the analysis of the video to be transmitted.
2. The method for parsing ARINC818 protocol video stream according to claim 1, wherein the parsing step of each video frame in step 2) is as follows:
2-1) judging the initial character of the video frame;
2-2) when the initial character of the video frame is the SOFI, counting and analyzing the video frame by using the frame header length and the data area length of the zeroth frame, and taking out the payload of the video data;
2-3) when the initial character of the video frame is the SOFn, counting and analyzing the video frame by using the frame header length and the data area length of the data frame, and extracting the video data payload.
3. The method of claim 2, wherein when the start character of a video frame is neither SOFi nor SOFn, waiting for the next video frame to be determined.
4. The method of claim 1, wherein when the resolution of the video to be transmitted is not changed and the transmission rate is changed, only the number of interval clock cycles between the data frames written into the configuration register is changed; all parameters written to the configuration registers are changed when the resolution of the video to be transmitted changes.
5. The method of parsing ARINC818 protocol video stream according to claim 1, wherein said parameters are written to configuration registers through AHB bus or AXI bus.
6. An ARINC818 protocol video stream analyzing device is characterized by comprising a parameter configuration module, a configuration register and a video frame analyzing module, wherein the parameter configuration module is used for receiving parameters configured by a sending end according to the resolution and the transmission speed of a video to be transmitted, and comprises the length of a data area, the number of data packets and the number of interval clock cycles between data frames, wherein the length of the data area is the number of clock cycles used for transmitting effective data in the video frames; the number of the data packets is the total number of the data packets in the video frame; the number of interval clock cycles between the data frames comprises the number of interval clocks between a first frame and a second frame of a video data frame, the number of interval clocks between an Nth frame and an N +1 th frame, and the number of interval clocks between a last frame and a first frame of a next video data frame; the configuration register is used for storing the parameters; the video frame analysis module is used for counting the length of a data area of a data frame in the video frame by using the parameters in the configuration register, and taking out a video data payload to realize the analysis of the video to be transmitted.
7. The apparatus for parsing ARINC818 protocol video stream according to claim 6, wherein the parsing step of each video frame is as follows:
(1) judging the initial character of the video frame;
(2) when the initial character of the video frame is the SOFI, counting and analyzing the video frame by using the frame header length and the data area length of the zeroth frame, and taking out the payload of the video data;
(3) when the initial character of the video frame is the SOFn, counting and analyzing the video frame by using the frame header length and the data area length of the data frame, and extracting the video data payload.
8. The apparatus as claimed in claim 7, wherein when the start character of the video frame is neither SOFi nor SOFn, the apparatus waits for the next video frame to determine.
9. The apparatus according to claim 6, wherein when the resolution of the video to be transmitted is not changed and the transmission rate is changed, only the number of interval clock cycles between the data frames written in the configuration register is changed; all parameters written to the configuration registers are changed when the resolution of the video to be transmitted changes.
10. The apparatus for parsing ARINC818 protocol video stream according to claim 6, wherein said parameters are written to configuration registers through AHB bus or AXI bus.
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| CN110012272A (en) * | 2019-04-12 | 2019-07-12 | 北京旋极信息技术股份有限公司 | A kind of method for transmission processing and device of ARINC818 data flow |
| CN112468757B (en) * | 2020-11-26 | 2023-04-07 | 中国航空工业集团公司洛阳电光设备研究所 | Adaptive resolution ARINC818 video conversion circuit based on FPGA |
| CN112564864B (en) * | 2020-12-31 | 2023-04-25 | 洛阳伟信电子科技有限公司 | ARINC818 bus link rate automatic adaption method |
| CN115361092B (en) * | 2022-07-18 | 2024-01-30 | 中国航空工业集团公司洛阳电光设备研究所 | ARINC818 logic high security monitoring design method |
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