CN114579072A - Display screen projection method and device across multiple operating systems - Google Patents
Display screen projection method and device across multiple operating systems Download PDFInfo
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- CN114579072A CN114579072A CN202210198700.0A CN202210198700A CN114579072A CN 114579072 A CN114579072 A CN 114579072A CN 202210198700 A CN202210198700 A CN 202210198700A CN 114579072 A CN114579072 A CN 114579072A
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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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/46—Multiprogramming arrangements
- G06F9/54—Interprogram communication
- G06F9/544—Buffers; Shared memory; Pipes
Abstract
A method and a device for screen projection across multiple operating systems are disclosed, which comprises the following steps: respectively operating a first operating system and a second operating system on different cores to display different contents; when the content on the first operating system is projected, applying for a memory in a shared memory, and storing image data into the shared memory; the address of the image data and the information of the image stored in the shared memory by the first operating system are sent to the second operating system through inter-core communication; and the second operating system analyzes the image according to the received data address and the image information and displays the image. The display screen projection method and device across multiple operating systems can meet the requirement of sharing display contents among the multiple operating systems in the vehicle.
Description
Technical Field
The invention relates to the technical field of software, in particular to a method and a device for projecting display contents of a cross-operating system to other screens based on a multi-core heterogeneous SOC.
Background
Along with the intelligent automobile with stronger and stronger multimedia functions, more and more display screens are arranged in the automobile, and the display screens comprise a central control main screen, an instrument display screen, a secondary driving entertainment screen, an AR HUD, a streaming media rearview mirror, a headrest screen and the like, which are different from different users and display contents facing different directions, and the display contents are usually operated in different operating systems due to the requirement on safety level. The driver can not easily intuitively acquire information of other screens, such as navigation information of a central control main screen. It is also inconvenient for the riders to share the display content. How to share the screen shots of multiple screen display contents in the vehicle becomes a key for solving the problem.
The following scheme is mainly adopted for the current products on the market:
1. and a plurality of chips are adopted, and the content needing screen projection is output to other display screens through multimedia interfaces of the two chips.
This increases the cost and also increases the complexity of the wiring of the vehicle. This kind of mode can only be one-to-one carry out the transmission, and throw the screen position and fix, is unfavorable for being applicable to more and more nimble car passenger cabin.
2. The pictures between the multiple systems are transmitted through wired or wireless vehicle-mounted Ethernet
This kind of mode can increase the cost, occupies the bandwidth of information transmission in the car simultaneously, leads to the interior pencil of car to increase simultaneously and is unfavorable for interior wiring
The existing scheme needs a plurality of chips or occupies an in-vehicle network in order to achieve screen projection sharing of in-vehicle display pictures. The cost is difficult to control and can lead to the interior wiring of car to increase simultaneously, is unfavorable for interior wiring.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a display screen projection method and device for multiple operating systems, which can meet the requirement of sharing display contents among the multiple operating systems in a vehicle.
In order to achieve the above object, the present invention provides a method for projecting a screen across multiple operating systems, comprising the following steps:
respectively operating a first operating system and a second operating system on different cores to display different contents;
when the content on the first operating system is projected, applying for a memory in a shared memory, and storing image data into the shared memory;
the address of the image data and the information of the image stored in the shared memory by the first operating system are sent to the second operating system through inter-core communication;
and the second operating system analyzes the image according to the received data address and the image information and displays the image.
Further, the step of the second operating system analyzing and displaying the image according to the received data address and the image information further comprises,
and when the second operating system receives the end of rendering of one frame of picture, sending a vertical synchronization signal to the first operating system.
Further, the method also comprises the following steps of,
and after the display of the second operating system is finished, informing the first operating system to write next frame data.
In order to achieve the above object, the present invention further provides a screen projection device for display across multiple operating systems, which includes a first operating system, a second operating system, and a shared memory, wherein,
the first operating system and the second operating system run on different cores to display different contents;
the first operating system is used for writing the image data into the shared memory and sending the address of the image data written into the shared memory and the information of the image to the second operating system through inter-core communication;
and the second operating system is used for analyzing and displaying the received information and informing the first operating system to write next frame data after the display is finished.
Further, the air conditioner is provided with a fan,
the first operating system is further configured to apply for a memory in the shared memory and write image data into the shared memory when the content on the first operating system is projected.
Further, the air conditioner is provided with a fan,
and the second operating system is also used for sending a vertical synchronizing signal to the first operating system after the rendering of one frame of picture is finished.
Further, the shared memory is configured to receive and store data of the first operating system, and send the stored data to the second operating system.
To achieve the above object, the present invention further provides a computer-readable storage medium having a computer program stored thereon, where the computer program is executed to perform the steps of the display screen projection method across multiple operating systems as described above.
The method and the device for displaying and projecting the screen across multiple operating systems have the following beneficial effects:
1) under the condition that a driver drives an automobile, navigation information of a central control main screen and rear information of a streaming media rearview mirror can be acquired on an instrument panel in a cross-system mode through projection of display contents, large-angle deviation of sight is reduced, and driving safety is guaranteed. The copilot passengers can also share interesting information browsed from the copilot entertainment by the copilot passengers through screen projection to other passengers. Under the condition of screen projection sharing, the current screen picture content can be shared by other passengers, and the normal display and the common browsing of the current screen are ensured at the same time;
2) image data are cached through the shared memory, and the image data in the shared memory are obtained through different operating systems on different cores in a synchronous mode through inter-core communication, so that display content projection among multiple operating systems is achieved under the condition that cost and wiring are not increased.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a flowchart of a method for screen projection across multiple operating systems according to the present invention;
FIG. 2 is a schematic diagram of a display screen projection device across multiple operating systems according to the present invention;
FIG. 3 is a flowchart illustrating a screen projection process across multiple operating systems according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Example 1
Fig. 1 is a flowchart of a display screen projection method across multiple operating systems according to the present invention, and the display screen projection method across multiple operating systems according to the present invention will be described in detail with reference to fig. 1.
First, in step 101, different operating systems run on different cores to display different content.
In step 102, a segment of shared memory is reserved on the entire screen projection scheme.
In step 103, when the content on the first operating system needs to be projected, a segment of memory in the shared memory is applied, and the image data is written into the memory.
In step 104, the first operating system sends the address of the image data and the information of the image to the second operating system through inter-core communication.
In step 105, the second operating system receives the address and analyzes the image from the transmitted address according to the image information, and displays the image on the second operating system.
In step 106, after the second os receives the end of rendering a frame, the VSYNC synchronization signal is sent to the first os.
In step 107, the first operating system writes the next frame of data.
In step 108, steps 104 through 107 are repeated until one of the operating systems sends a stop signal via inter-core communication.
The embodiment of the invention is used for any scene of automobile multimedia needing screen projection, realizes cross-system display screen projection through software, and simultaneously realizes the transmission of multi-system image data in a mode of sharing memory and inter-core communication.
The invention provides a multi-core heterogeneous SOC (system on chip) cross-operating system screen projection-based software scheme, which is used for sharing and displaying image data running in different operating systems and putting the image data needing screen projection into a shared memory for reading and writing of multiple systems. The invention increases the convenience of the screen projection scheme of the automobile entertainment system, does not depend on the transmission of the interface to data, ensures the refresh frame rate of the image, and reduces the system overhead and hardware cost caused by the dependence on the interface.
Example 2
Fig. 2 is a schematic diagram of a screen projection device across multiple operating systems according to the present invention, as shown in fig. 2, the screen projection device includes a first operating system 10, a second operating system 20, a shared memory 30, and a screen 40, wherein,
the first operating system 10 and the second operating system 20 run on different cores to display different content.
The first operating system 10 is configured to write image data into the shared memory 30, and then notify the second operating system 20 of an address of the image data and image information through inter-core communication.
Preferably, the first operating system 10 is further configured to apply for a segment of memory in the shared memory 30 to write the image data into the memory when the content on the first operating system 10 needs to be projected.
Preferably, the first operating system 10 is also used to write the next frame data.
Preferably, the first operating system 10 further includes a stop module, not shown in the figure, and the stop module is configured to send and receive a stop signal to control the first operating system 10 to stop writing data.
The second operating system 20 is configured to parse and display the received information, and notify the first operating system 10 to write next frame data after the display is completed.
Preferably, the second operating system 20 is further configured to, after receiving the address of the image data and the image information, analyze the image from the transmitted address according to the image information, and display the image on the second operating system 20.
Preferably, the second os 20 is further configured to send a VSYNC synchronization signal to the first os 10 after receiving that rendering of one frame of picture is finished.
Preferably, the second operating system 20 further includes a stop module, not shown in the figure, for sending and receiving a stop signal to control the first operating system 10 to stop writing data.
The shared memory 30 is configured to receive and store data of the first operating system 10, and send the stored data to the second operating system 20.
The screen 40 is used for displaying screen projection contents.
Example 3
Fig. 3 is a schematic diagram of a screen projection process across multiple operating systems according to an embodiment of the present invention, as shown in fig. 3, an operating system 1 displays content, the operating system 1 applies for a section of memory in a reserved shared memory and writes image data in the memory, the operating system 1 transmits an address and information of the image data to an operating system 2 through inter-core communication, the operating system 2 obtains the image data written in by the operating system 1, and the operating system 2 displays the image data taken from the shared memory on a screen of the operating system 2, completes displaying of a frame of image data, and returns a synchronization signal.
In one embodiment of the present invention, there is also provided a computer readable storage medium having stored thereon a computer program which when run performs the steps of the method for display screen projection across multiple operating systems as described above.
Those of ordinary skill in the art will understand that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A screen projection method for display of a cross-multi-operating system is characterized by comprising the following steps:
respectively operating a first operating system and a second operating system on different cores to display different contents;
when the content on the first operating system is projected, applying for a memory in a shared memory, and storing image data into the shared memory;
the address of the image data and the information of the image stored in the shared memory by the first operating system are sent to the second operating system through inter-core communication;
and the second operating system analyzes the image according to the received data address and the image information and displays the image.
2. The method for screen projection across multiple operating systems according to claim 1, wherein the step of the second operating system parsing and displaying the image according to the received data address and image information, further comprises,
and when the second operating system receives the end of rendering a frame of picture, sending a vertical synchronization signal to the first operating system.
3. The method for display screen projection across multiple operating systems of claim 2, further comprising,
and after the display of the second operating system is finished, informing the first operating system to write next frame data.
4. A screen projection device for display of multiple operating systems comprises a first operating system, a second operating system, and a shared memory, wherein,
the first operating system and the second operating system run on different cores to display different contents;
the first operating system is used for writing the image data into the shared memory and sending the address of the image data written into the shared memory and the information of the image to the second operating system through inter-core communication;
and the second operating system is used for analyzing and displaying the received information and informing the first operating system to write next frame data after the display is finished.
5. The device of claim 4, wherein the display screen-projecting device is a multi-operating-system-spanning display screen-projecting device,
the first operating system is further configured to apply for a memory in the shared memory and write image data into the shared memory when the content on the first operating system is projected.
6. The device of claim 4, wherein the display screen-projecting device is a multi-operating-system-spanning display screen-projecting device,
and the second operating system is also used for sending a vertical synchronization signal to the first operating system after the rendering of one frame of picture is finished.
7. The device for screen projection across multiple operating systems according to claim 4, wherein the shared memory is configured to receive and store data of the first operating system, and send the stored data to the second operating system.
8. A computer-readable storage medium having a computer program stored thereon, wherein the computer program when executed performs the steps of the method of any one of claims 1 to 3 for display screen projection across multiple operating systems.
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| CN202210198700.0A CN114579072A (en) | 2022-03-02 | 2022-03-02 | Display screen projection method and device across multiple operating systems |
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| CN114998500A (en) * | 2022-07-20 | 2022-09-02 | 南京芯驰半导体科技有限公司 | Rendering system and method based on SOC platform |
| CN115344226A (en) * | 2022-10-20 | 2022-11-15 | 亿咖通(北京)科技有限公司 | Screen projection method, device, equipment and medium under virtualization management |
| CN115357207A (en) * | 2022-10-18 | 2022-11-18 | 南京芯驰半导体科技有限公司 | Screen projection system and method based on heterogeneous SoC |
| CN115460442A (en) * | 2022-08-11 | 2022-12-09 | 北京罗克维尔斯科技有限公司 | Screen projection switching method and device, electronic equipment, readable storage medium and vehicle |
| CN115904295A (en) * | 2023-02-21 | 2023-04-04 | 南京芯驰半导体科技有限公司 | Multi-screen display control method, device, medium, system, chip and panel |
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