CN111385521A - Method for distributed display of user interface and decoding equipment - Google Patents
Method for distributed display of user interface and decoding equipment Download PDFInfo
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- CN111385521A CN111385521A CN201811607175.3A CN201811607175A CN111385521A CN 111385521 A CN111385521 A CN 111385521A CN 201811607175 A CN201811607175 A CN 201811607175A CN 111385521 A CN111385521 A CN 111385521A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
- G06F3/1423—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display
- G06F3/1446—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display display composed of modules, e.g. video walls
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0658—Clock or time synchronisation among packet nodes
- H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/44—Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
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Abstract
The invention discloses a method for displaying a user interface in a distributed manner and decoding equipment.A main CPU of the decoding equipment runs a UI program to generate a complete UI user interface, and the UI user interface is divided according to the corresponding region of the complete UI user interface on each output channel of the decoding equipment; respectively sending the divided UI user interface data to the display caches of the CPUs corresponding to the output channels, wherein the sent divided UI user interface data carries the time stamps of the main CPUs; and the CPU corresponding to each output channel and the main CPU of the main equipment carry out time synchronization, and synchronously display and output the received UI user interface data to the corresponding spliced screen. The invention ensures the synchronous display effect of the UI through a dual time synchronization mechanism, breaks through the limitation that one device can only display the UI at one output port, expands the display of the UI to a plurality of output channels, enlarges the display area of the UI image and improves the display effect of the UI image.
Description
Technical Field
The invention belongs to the technical field of video decoding, and particularly relates to a method for distributed display of a user interface and decoding equipment.
Background
Video monitoring is an important component of a safety precaution system, and is widely applied to many occasions due to intuition, accuracy, timeliness and rich information content. In recent years, with the rapid development of computers, networks, image processing and transmission technologies, the popularization trend of video monitoring is more and more obvious.
In many monitoring centers of video monitoring systems, a video wall (or called a large screen display) is deployed to intensively display monitoring scenes, such as a command center based on an AR live-action map. Generally, on a large display screen of a monitoring center, a User Interface (UI) is often superimposed on a video image, and the UI includes information displayed superimposed on the video image, such as various labels, buttons, and the like. For example, on a large display screen of a command center based on an AR live-action map, POI information such as buildings, areas, intersections, and the like can be marked by superimposing a label based on an actual monitoring picture, and secondary information can be expanded by clicking the label.
In practical application, a large display screen of a monitoring center is formed by splicing a plurality of spliced screens, and each spliced screen corresponds to an output channel of a decoder. When the user interface UI is displayed on a large display screen, much of the label information may span multiple tiled screens.
Therefore, currently, the UI of the large-screen UI displayed in the monitoring center is manufactured on a computer and finally output to the large-screen UI for presentation. Such an implementation requires a view of a screen displayed on a computer, and is affected by the display resolution of the computer, and thus has a significant limitation on the view of the screen.
Disclosure of Invention
The invention aims to provide a method for displaying a user interface in a distributed manner and decoding equipment, which realize the distributed display of the user interface at a decoder and solve the problem that the current UI user interface can only be realized on a single CPU and can not present label information across the CPU.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method for displaying a user interface in a distributed manner on a large display screen spliced by a spliced screen, the method for displaying the user interface in a distributed manner comprises the following steps:
running a UI program through a main CPU of the decoding equipment to generate a complete UI user interface, and dividing the UI user interface according to corresponding regions of the complete UI user interface on each output channel of the decoding equipment;
respectively sending the divided UI user interface data to the display caches of the CPUs corresponding to the output channels, wherein the sent divided UI user interface data carries the time stamps of the main CPUs;
and the CPU corresponding to each output channel and the main CPU of the main equipment carry out time synchronization, and synchronously display and output the received UI user interface data to the corresponding spliced screen.
Further, on a main CPU of the decoding device, according to the total number of pixel points output by the large display screen, a point-to-point cache space is applied for caching the generated complete UI user interface, and the resolution of the complete UI user interface is the same as that of the large display screen.
Further, the sending the divided UI user interface data to the display cache of the CPU corresponding to each output channel includes:
dividing the display cache of the CPU corresponding to each output channel according to the area corresponding to each output channel;
and respectively sending the divided UI user interface data to the display cache of the CPU corresponding to each output channel.
Further, the decoding device comprises a master device and a slave device, and the split UI user interface data is transmitted between the master device and the slave device in a Socket manner.
Further, the synchronously displaying and outputting the received UI user interface data to the corresponding mosaic screen includes:
if the time stamp of the main CPU carried in the received UI user interface data is synchronous with the local time, directly outputting and displaying; otherwise, the CPU corresponding to each output channel and the main CPU of the main device perform time synchronization and then display and output.
The invention also provides decoding equipment for user interface distributed display, which is used for displaying the user interface on a large display screen spliced by a spliced screen, and comprises a main CPU module on the main equipment and channel CPU modules corresponding to the channels, wherein:
the main CPU module is used for operating the UI program to generate a complete UI user interface, segmenting the UI user interface according to the corresponding region of the complete UI user interface on each output channel of the decoding equipment, respectively sending segmented UI user interface data to the display cache of the channel CPU module corresponding to each output channel, and carrying the timestamp of the main CPU module in the sent segmented UI user interface data;
and the channel CPU module is used for carrying out time synchronization with the main CPU module of the main equipment, and synchronously displaying and outputting the received UI user interface data to the corresponding spliced screen.
Further, the main CPU module applies a point-to-point cache space for caching the generated complete UI user interface according to the total number of pixels output by the large display screen, where the resolution of the complete UI user interface is the same as that of the large display screen.
Further, the main CPU module sends the divided UI user interface data to the display cache of the channel CPU module corresponding to each output channel, and executes the following operations:
dividing the display cache of the channel CPU module corresponding to each output channel according to the area corresponding to each output channel;
and respectively sending the divided UI user interface data to the display caches of the CPU modules of the channels corresponding to the output channels.
Further, the decoding device comprises a master device and a slave device, and the split UI user interface data is transmitted between the master device and the slave device in a Socket manner.
Further, the channel CPU modules synchronously display and output the received UI user interface data to the corresponding mosaic screen, and perform the following operations:
if the time stamp of the main CPU carried in the received UI user interface data is synchronous with the local time, directly outputting and displaying; otherwise, the CPU corresponding to each output channel and the main CPU of the main device perform time synchronization and then display and output.
According to the method and the decoding device for the distributed display of the user interface, the complete UI user interface is generated through the main CPU, and the UI image is distributed to each slave device and each slave CPU from the main CPU in a Socket mode, so that the distributed display of the UI is realized. Before the UI image is sent, adding a timestamp of sending time to each block area; and meanwhile, time synchronization mechanisms of the slave equipment, the slave CPU and the master CPU on the master equipment are added, and the synchronous display effect of the UI is ensured through two time synchronization mechanisms. Reducing transmission time to each slave device, slave CPU, by dividing the UI image; after receiving the data, each slave device and each slave CPU perform data conversion by using the overall performance, thereby reducing the time consumption of the conversion process. The invention can break through the limitation that one device can only display the UI at one output port, expand the display of the UI to a plurality of output channels, enlarge the display area of the UI image and improve the display effect of the UI image; the realization of the distributed UI can change the scheme of the command center from the original PC output to the realization on a decoder, thereby improving the display effect of the live-action map, greatly widening the visual field of the live-action map and improving the on-site command effect of the command center.
Drawings
FIG. 1 is a flowchart of a method for distributed display of a user interface according to an embodiment of the present invention;
FIG. 2 is a diagram of a decoding apparatus according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a data transmission format according to an embodiment of the present invention;
fig. 4 is a diagram illustrating a timestamp transmission format according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the drawings and examples, which should not be construed as limiting the present invention.
The general idea of the invention is to break through the mode of adopting a computer to manufacture a UI and output the UI to a display large screen in the prior art, realize the decoding of the ultra-high definition video by adopting a decoder and realize the mode of displaying a label on the decoder. However, one difficulty of the decoder implementation scheme is that for tag information spanning multiple spliced screens, the tag information is difficult to implement through the conventional UI implementation method, and the problem of data overlapping or missing on the split screen boundary line is very easy to occur. The invention aims to solve the problems of how to present UI information across CPUs and how to solve the problem of cross-screen label display among spliced screens.
As shown in fig. 1, an embodiment of the present invention is a method for displaying a user interface in a distributed manner, for displaying the user interface on a large display screen spliced by a spliced screen, including:
running a UI program through a main CPU of the decoding equipment to generate a complete UI user interface, and dividing the UI user interface according to corresponding regions of the complete UI user interface on each output channel of the decoding equipment;
respectively sending the divided UI user interface data to the display caches of the CPUs corresponding to the output channels;
and the CPU corresponding to each output channel and the main CPU of the main equipment carry out time synchronization, and synchronously display and output the received UI user interface data to the corresponding spliced screen.
In this embodiment, distributed display of the UI user interface is realized by a decoding device, where the decoding device is a device that receives a video stream, decodes the video stream, and sends the decoded video stream to the display, and may be one device, or several devices may be cascaded together. When several devices are cascaded together, one device is a master device, and the other device is a slave device, and the invention can realize the cross-device distributed UI user interface display. The present invention is not limited to the specific implementation form of the decoding device, and in the present embodiment, the master device or the slave device is generally referred to as the decoding device. Each device may include multiple CPUs, each CPU corresponds to multiple output channels, for example, one CPU corresponds to every 2-3 output channels, multiple CPUs belong to one device, and different CPUs of the same device cannot directly share data.
For example, as shown in fig. 2, assuming that DEV2 is a master device, DEV1 and DEV3 are slave devices, fig. 2 only shows the CPU and the output channel VO of DEV2, and DEV 1-DEV 3 combined together may be regarded as a decoding device. Where each device has its own CPU, a device may have multiple CPUs, e.g., DEV2 has CPU1, CPU2, CPU 3; each CPU may also correspond to a different output channel, e.g., CPU1 corresponds to output channels VO1, VO2, CPU2 corresponds to output channels VO3, VO4, and so on. And the output channels of all the devices are respectively connected to the corresponding spliced screens, and all the spliced screens are spliced into a large display screen of the monitoring center.
In this embodiment, each output channel is regarded as an output channel of the decoding device, each CPU is regarded as a CPU of the decoding device, the user interface for running the UI program to generate the complete UI is referred to as a master CPU, a device in which the master CPU is located is referred to as a master device, and other devices are referred to as slave devices.
It is easy to understand that, from the internal structure of the slave device, there are a master CPU and a slave CPU in the master device, and there are a master CPU and a slave CPU in the slave device, and the master CPU communicates with the slave CPU of the device.
In this embodiment, the UI program is run by the main CPU of the main device to generate a complete UI user interface. Of course, the complete UI user interface may also be generated by running the UI program by the master CPU of the slave device, which is not limited by the present invention. The general idea of the invention is that a CPU runs a UI program to generate a complete UI user interface, and then the complete UI user interface is divided and sent to other CPUs.
In this embodiment, a main CPU of the decoding apparatus runs a UI program to generate a complete UI user interface, and divides the UI user interface according to a corresponding region of the complete UI user interface on each output channel of the decoding apparatus.
The generation of the UI user interface can be realized only on one CPU, and the embodiment refers to the generation of the complete UI user interface for running the UI program as the main CPU. The UI program is a software program for making a UI user to decode, and by running the program on the CPU, a user can add and modify label information and other information required to be displayed on the UI to complete the making of the whole UI user interface. The generation of the UI user interface is a relatively mature technology, and is not described herein. The complete UI user interface of the embodiment has the same resolution as that of the large display screen, and a point-to-point cache space is applied according to the total number of the pixel points output by the large display screen, so that a user interface which can be consistent with the resolution of the large display screen and can be perfectly covered can be generated.
In this embodiment, each output channel corresponds to a respective tiled screen, and each tiled screen is tiled to display a large screen, so that each output channel corresponds to a region of a part of the UI user interface. In this embodiment, the UI user interface is divided according to the corresponding area of the complete UI user interface on each output channel of the decoding device, and a divided output channel corresponds to a part of UI user interface data.
The display output of the UI user interface needs to depend on a frame buffer FB (frame buffer cache), which is an interface provided for the display device, and which is also a common memory device and can be read and written like a memory device (/ dev/mem). But the difference is that FB uses not the entire memory area but a video memory portion.
In this embodiment, a buffer space of a block of FB is applied for outputting a display UI on a CPU corresponding to an output channel on which the UI is to be displayed, and a buffer space of a block of FB is applied for each CPU to be displayed in each sub-decoding apparatus, and a display buffer of a CPU corresponding to each output channel is divided according to an area corresponding to each output channel. At initialization, the size of the buffer space is applied according to the actual output resolution of each output channel, and the output of the UI needs to be displayed on each involved CPU.
It should be noted that, in this embodiment, the display buffer FB is only set on the CPU corresponding to the output channel docked with the tiled screen, and the output channel of some decoding devices is not connected to the tiled screen and is not used for displaying the UI, and then the setting is not performed.
In this embodiment, a UI user interface generated by a UI program is stored in a memory, and is not directly output to a FB of a main CPU of a main device, a UI image in RGB format is cut according to a corresponding area of a UI on an output channel, each output channel after cutting has a corresponding RGB data block, the RGB data block is sent to each CPU, and conversion into YUV data is required when a part of devices are displayed, where the conversion format is as follows:
Y＝0.299*R+0.587*G+0.114*B；
U＝-0.169*R-0.331*G+0.5*B；
V＝0.5*R-0.419*G-0.081*B。
it should be noted that, because data between different devices and between different CPUs of the same device cannot be shared directly, there is a need for a mechanism that allows data on the main CPU to be sent to each CPU, and there are generally two methods for this:
1) data transmission is carried out between the master device and the slave device in a Socket mode, and the data are sent to the master CPU of each slave device by the master CPU of the master device;
2) socket communication is established between the master CPU and the slave CPU, and data are sent to the slave CPUs in a Socket mode, which is the most common mode; part of the equipment has PCIe hardware architecture on hardware, and data sharing among different CPUs can be realized through PCIe.
The present invention is not limited to the data transmission mode among the CPUs, and the details are not repeated herein.
For the UI display among multiple CPUs, the present embodiment needs a synchronous display mechanism to achieve the effect of synchronous output of UI images. The invention uses the mode of time stamp to control the UI synchronous display output, and the format of data transmission is defined as shown in figure 3:
FIG. 3 shows a data transfer protocol format between CPUs, wherein a field Date indicates the number of seconds from 0.1/1/1970 to the present, and takes 8 bytes; the field Len represents the length of UI Data and occupies 4 bytes; the field UI Payload represents the actual data of the UI image, with length Len.
In an embodiment of the present invention, the time stamp of the main CPU is carried in the divided UI user interface data.
When the main CPU sends data outwards, the current time of the device is obtained and converted into seconds from 1/0 in 1970 to the current time, and the seconds are carried in the divided UI data. Therefore, the UI user interface data of each transmission channel has the time stamp of the main CPU, and synchronous output is facilitated.
In order to realize time synchronization, the slave CPU and the slave device (the slave CPU of the slave device synchronizes the time of the master CPU of the slave device) also need to synchronize the time of the master CPU on the master device, so as to avoid the slave CPU and the slave device from generating large time offset, which causes large image asynchronization of the distributed UI in the real process.
The command format used to synchronize the timestamps is shown in FIG. 4, where the protocol field CmdType indicates the command type, taking 4 bytes; len represents the length of the message content and occupies 4 bytes; the field Data represents the Data content carried by the command and has a length Len.
The slave CPU and the slave device periodically desynchronize the time with a certain time interval (5s) to the master CPU of the master device, and the synchronous display output of the UI data on each CPU is controlled through a time stamp.
Corresponding to the above method, there is also provided an embodiment of a decoding device for user interface distributed display, configured to display a user interface on a large display screen spliced by a spliced screen, where the decoding device for user interface distributed display includes a main CPU module on a main device and channel CPU modules corresponding to respective channels, where:
the main CPU module is used for operating the UI program to generate a complete UI user interface, segmenting the UI user interface according to the corresponding region of the complete UI user interface on each output channel of the decoding equipment, respectively sending segmented UI user interface data to the display cache of the channel CPU module corresponding to each output channel, and carrying the timestamp of the main CPU module in the sent segmented UI user interface data;
and the channel CPU module is used for carrying out time synchronization with the main CPU module of the main equipment, and synchronously displaying and outputting the received UI user interface data to the corresponding spliced screen.
The present embodiment is a specific decoding device corresponding to the foregoing method for user interface distributed display, and the content of the technical solution has been set forth in detail in the description of the method, and here, the present apparatus is only briefly described by way of example, and is not set forth in detail.
In an embodiment of the present invention, the main CPU module further applies a point-to-point cache space for caching the generated complete UI user interface according to the total number of pixels output by the large display screen, and the resolution of the complete UI user interface is the same as that of the large display screen.
In an embodiment of the present invention, the main CPU module sends the divided UI user interface data to the display caches of the channel CPU modules corresponding to the output channels, and executes the following operations:
dividing the display cache of the channel CPU module corresponding to each output channel according to the area corresponding to each output channel;
and respectively sending the divided UI user interface data to the display caches of the CPU modules of the channels corresponding to the output channels.
In an embodiment of the present invention, the decoding device includes a master device and a slave device, and the split UI user interface data is transmitted between the master device and the slave device in a Socket manner.
In an embodiment of the present invention, the channel CPU modules synchronously display and output the UI user interface data received by each channel CPU module to the corresponding mosaic screen, and execute the following operations:
if the time stamp of the main CPU carried in the received UI user interface data is synchronous with the local time, directly outputting and displaying; otherwise, the CPU corresponding to each output channel and the main CPU of the main device perform time synchronization and then display and output.
It should be noted that, in this embodiment, the decoding device may include a master device and a slave device, the master CPU module is located on the master device, and the CPU modules of the channels may be located on the master device or located on the slave device, which is not described herein again.
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and those skilled in the art can make various corresponding changes and modifications according to the present invention without departing from the spirit and the essence of the present invention, but these corresponding changes and modifications should fall within the protection scope of the appended claims.
Claims (10)
1. A method for displaying a user interface in a distributed manner, which is used for displaying the user interface on a large display screen spliced by a spliced screen, and is characterized in that the method for displaying the user interface in a distributed manner comprises the following steps:
running a UI program through a main CPU of the decoding equipment to generate a complete UI user interface, and dividing the UI user interface according to corresponding regions of the complete UI user interface on each output channel of the decoding equipment;
respectively sending the divided UI user interface data to the display caches of the CPUs corresponding to the output channels, wherein the sent divided UI user interface data carries the time stamps of the main CPUs;
and the CPU corresponding to each output channel and the main CPU of the main equipment carry out time synchronization, and synchronously display and output the received UI user interface data to the corresponding spliced screen.
2. The method for distributed display of user interfaces according to claim 1, wherein a point-to-point cache space is applied for caching the generated complete UI user interface according to the total number of pixels output by the large display screen on a main CPU of the decoding device, and the resolution of the complete UI user interface is the same as that of the large display screen.
3. The method for distributed display of a user interface according to claim 1, wherein the step of sending the divided UI user interface data to the display buffers of the CPUs corresponding to the output channels respectively comprises:
dividing the display cache of the CPU corresponding to each output channel according to the area corresponding to each output channel;
and respectively sending the divided UI user interface data to the display cache of the CPU corresponding to each output channel.
4. The method for distributed display of a user interface according to claim 1, wherein the decoding device includes a master device and a slave device, and the split UI user interface data is transmitted between the master device and the slave device in a Socket manner.
5. The method for distributed display of user interfaces according to claim 1, wherein the step of synchronously displaying and outputting the respective received UI user interface data to the corresponding mosaic screen comprises:
if the time stamp of the main CPU carried in the received UI user interface data is synchronous with the local time, directly outputting and displaying; otherwise, the CPU corresponding to each output channel and the main CPU of the main device perform time synchronization and then display and output.
6. The decoding device for the distributed display of the user interface is used for displaying the user interface on a large display screen spliced by a spliced screen, and is characterized by comprising a main CPU module on a main device and channel CPU modules corresponding to channels, wherein:
the main CPU module is used for operating the UI program to generate a complete UI user interface, segmenting the UI user interface according to the corresponding region of the complete UI user interface on each output channel of the decoding equipment, respectively sending segmented UI user interface data to the display cache of the channel CPU module corresponding to each output channel, and carrying the timestamp of the main CPU module in the sent segmented UI user interface data;
and the channel CPU module is used for carrying out time synchronization with the main CPU module of the main equipment, and synchronously displaying and outputting the received UI user interface data to the corresponding spliced screen.
7. The decoding device for user interface distributed display according to claim 6, wherein the main CPU module further applies a point-to-point buffer space for buffering the generated complete UI user interface according to the total number of pixels output by the large display screen, and the complete UI user interface has the same resolution as the large display screen.
8. The decoding apparatus for user interface distributed display according to claim 6, wherein the main CPU module sends the divided UI user interface data to the display buffers of the channel CPU modules corresponding to the output channels, respectively, and performs the following operations:
dividing the display cache of the channel CPU module corresponding to each output channel according to the area corresponding to each output channel;
and respectively sending the divided UI user interface data to the display caches of the CPU modules of the channels corresponding to the output channels.
9. The decoding device for user interface distributed display according to claim 6, wherein the decoding device comprises a master device and a slave device, and the split UI user interface data is transmitted between the master device and the slave device in a Socket manner.
10. The decoding device for user interface distributed display according to claim 6, wherein the channel CPU module synchronously displays and outputs the respective received UI user interface data to the corresponding mosaic screen, and performs the following operations:
if the time stamp of the main CPU carried in the received UI user interface data is synchronous with the local time, directly outputting and displaying; otherwise, the CPU corresponding to each output channel and the main CPU of the main device perform time synchronization and then display and output.
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