CN111683276A - Vehicle-mounted real-time multi-screen projection method based on android system - Google Patents
Vehicle-mounted real-time multi-screen projection method based on android system Download PDFInfo
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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
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/414—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance
- H04N21/41422—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance located in transportation means, e.g. personal vehicle
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
- H04L65/65—Network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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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
- H04N21/431—Generation of visual interfaces for content selection or interaction; Content or additional data rendering
- H04N21/4312—Generation of visual interfaces for content selection or interaction; Content or additional data rendering involving specific graphical features, e.g. screen layout, special fonts or colors, blinking icons, highlights or animations
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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
- H04N21/443—OS processes, e.g. booting an STB, implementing a Java virtual machine in an STB or power management in an STB
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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
- H04N21/6437—Real-time Transport Protocol [RTP]
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Abstract
The invention discloses a vehicle-mounted real-time multi-screen projection method based on an android system, which comprises the following steps of: 1) establishing a vehicle-mounted network physical link between a central control system end and an instrument end based on a vehicle-mounted Ethernet; 2) respectively erecting SOME/IP services in a central control system end and an instrument end, and transmitting control messages between the central control system end and the instrument end; 3) and an RTP server side is established at the central control system side, and an RTP receiving side is established at the instrument side for transmitting and displaying screen projection contents. The method and the device have the advantages that the second screen is derived in the Android system by distinguishing from interface display, the content to be displayed in the navigation application is filled in the second screen, video transmission among heterogeneous systems is realized, and the method and the device are high in instantaneity, low in delay, high in safety and low in cost.
Description
Technical Field
The invention relates to the field of vehicle-mounted systems of automobiles, in particular to a vehicle-mounted real-time multi-screen projection method based on an android system.
Background
SOME/IP is fully called Scalable service-organized middleware over IP (Scalable service Oriented middleware based on IP), and is developed based on TCP/IP and is a vehicular Ethernet middleware solution which can be used for controlling messages. The method is suitable for equipment with different sizes and operating systems, such as TBOX, vehicle-mounted entertainment equipment and the like.
The RTP protocol is a real-time streaming protocol. It is a standard proposed by IETF, and RTP is used to provide end-to-end real-time transmission service for various multimedia data requiring real-time transmission, such as voice, image, fax, etc., over IP network. RTP provides time information and stream synchronization for end-to-end real-time transmission over the Internet.
With the upgrading and upgrading of automobile electronic products, the scale and complexity of an in-vehicle electronic system are increasing, and more vehicle-mounted systems use Android as a central control system to run various applications, such as navigation applications. Meanwhile, as the requirements of consumers on the use of automobiles are continuously improved, new requirements and new characteristics are continuously provided, for example, a navigation real-time map is projected to a meter end or a HUD. The requirements relate to video transmission among heterogeneous systems, and higher requirements such as high bandwidth, safety, low cost and the like are imposed on a vehicle-mounted network, and the traditional CAN, LIN, FlexRay and MOST cannot meet the requirements.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a vehicle-mounted real-time multi-screen projection method based on an android system, which is used for realizing video transmission among heterogeneous systems and has the advantages of high instantaneity, low delay, high safety and low cost.
The purpose of the invention is realized as follows: a vehicle-mounted real-time multi-screen projection method based on an android system comprises the following steps:
step 1) establishing a vehicle-mounted network physical link between a central control system end and an instrument end based on a vehicle-mounted Ethernet;
step 2) respectively erecting SOME/IP services in the central control system end and the instrument end, and transmitting control messages between the central control system end and the instrument end;
and 3) establishing an RTP server at the central control system end, and establishing an RTP receiving end at the instrument end to transmit and display screen projection contents.
As a further limitation of the present invention, the step 2) specifically includes:
2-1) the central control system terminal issues SOME/IP service;
2-2) the meter end discovers the SOME/IP service issued by the central control system end through the service discovery component;
2-3) the meter terminal subscribes SOME/IP service;
2-4) the central control system end sends a notification message;
2-5) the instrument end receives and receives the SOME/IP notification message sent by the central control system end and then displays the information.
As a further limitation of the present invention, the step 3) specifically includes the following steps:
3-1) the application software places the content to be displayed in a standard interface, and obtains the content to be displayed through the association of VirtualDisplay ID in an RTP server; compressing and coding the acquired content to be displayed at an RTP server side, and transmitting the content to an RTP receiving end of an instrument side;
3-2) the RTP receiving end of the meter end decodes the content to be displayed and displays the content on the screen of the meter.
As a further limitation of the present invention, the step 3-1) specifically comprises the following steps:
3-1-1) creating a Presentation sub-screen control in an application layer of the android system, and finishing rendering work in the sub-screen control;
3-1-2) the RTP server side creates a VirtualDisplay object in the android system, and the VirtualDisplay object is associated with the rendering content in the Presentation auxiliary screen control through a Dispaymanager callback interface registered by an application layer;
3-1-3) the RTP server side creates a MediaCodec object in the android system and encodes the original frame;
3-1-4) binding an input buffer area of the MediaCodec object with a VirtualDisplay object created by an RTP server;
3-1-5) the rendering content in the Presentation sub-screen control is continuously filled into a buffer area of the MediaCodec for coding processing;
3-1-6) the RTP thread asynchronously acquires the encoded H264 data through a callback function registered in the RTP thread by the MediaCodec, adds an RTP header to the encoded H264 data, and sends the encoded H264 data as a frame of RTP data to an RTP receiving end of the instrument end.
As a further limitation of the present invention, the step 3-2) specifically comprises the following steps:
3-2-1) receiving and analyzing an RTP protocol set up by an RTP receiving end of the instrument end, receiving data from a specified port, and then calling a specified interface function to analyze and obtain a data packet with the load of H264;
3-2-2) the RTP receiving end analyzes the H264 data packet, the data is sent to the built playing frame in real time for decoding, and the data is sent to the display equipment for playing through hard decoding.
Compared with the prior art, the technical scheme adopted by the invention has the beneficial effects that: 1. the method can be used as a standard scheme for screen projection in an Android system, can be operated in any Android operating system, shields the difference brought by bottom hardware, and saves the deployment cost; the method has the advantages that the separation of the application and the screen projection process is realized, the universality is good, the application development is independent of the system environment, the application development is faster and has no mutual dependence, and the development period is shorter;
2. a protocol SOME/IP of vehicle-mounted Ethernet communication is introduced, and the SOME/IP is transmitted when a receiver needs the SOME/IP, so that excessive unnecessary data cannot appear on a bus, and the load is reduced.
3. A multi-screen different display is applied, namely a Presentation control provided by an Android system is used for synchronizing rendered pictures on a main screen, an RTP (real-time transport protocol) is introduced, and a screen projection function based on an Android platform is realized.
4. The real-time performance of video transmission is high, the delay is low, the delay is less than 150ms, the method is more suitable for a vehicle-mounted environment, and various laws and regulations and authentication processes can be easily passed.
Drawings
FIG. 1 is a flow chart of the present invention.
FIG. 2 is a timing diagram of the SOME/IP service triggering between the vehicle and the meter.
Fig. 3 is a flowchart of a screen projection function based on an Android system and an RTP protocol according to the present invention.
Fig. 4 is a timing diagram of RTP receiving end interaction according to the present invention.
Detailed Description
As shown in fig. 1, in a vehicle-mounted real-time multi-screen projection method based on an android system,
step 1) establishing a vehicle-mounted network physical link between a central control system end and an instrument end based on a vehicle-mounted Ethernet;
step 2) respectively erecting SOME/IP services in the central control system end and the instrument end, and transmitting control messages between the central control system end and the instrument end; the SOME/IP services include ethernet services, protocol stacks, routing managers, etc.
2-1) the central control system terminal issues SOME/IP service;
2-2) the meter end discovers the SOME/IP service issued by the central control system end through the service discovery component;
2-3) the meter terminal subscribes SOME/IP service;
2-4) the central control system end sends a notification message;
2-5) the instrument end receives and receives the SOME/IP notification message sent by the central control system end and then displays the information.
And 3) establishing an RTP server at the central control system end, and establishing an RTP receiving end at the instrument end to transmit and display screen projection contents.
3-1) the application software places the content to be displayed in the Presentation of the standard interface, and obtains the content to be displayed through the association of the Virtual Display ID in the RTP server; compressing and coding the acquired content to be displayed at an RTP server side, and transmitting the content to an RTP receiving end of an instrument side;
3-1-1) creating a Presentation sub-screen control in an application layer of the android system, and finishing rendering work in the sub-screen control;
3-1-2) the RTP server side creates a VirtualDisplay object in the android system, and the VirtualDisplay object is associated with the rendering content in the Presentation auxiliary screen control through a Dispaymanager callback interface registered by an application layer;
3-1-3) the RTP server side creates a MediaCodec object in the android system and encodes the original frame;
3-1-4) binding an input buffer area of the MediaCodec object with a VirtualDisplay object created by an RTP server;
3-1-5) the rendering content in the Presentation sub-screen control is continuously filled into a buffer area of the MediaCodec for coding processing;
3-1-6) the RTP thread asynchronously obtains the encoded H264 data through a callback function registered in the RTP thread by the MediaCodec, the RTP thread automatically completes the packaging of the H264 data, the control of the video quality is realized by using an RTCP protocol, the encoded H264 data is added with an RTP head and used as a frame of RTP data, and the packaged data is sent to an RTP receiving end of the instrument end based on the UDP protocol.
3-2) the RTP receiving end of the instrument end decodes the content to be displayed and displays the content on the instrument screen;
3-2-1) receiving and analyzing an RTP protocol set up by an RTP receiving end of the instrument end, receiving data from a specified port, and then calling a specified interface function to analyze and obtain a data packet with the load of H264;
3-2-2) the RTP receiving end analyzes the H264 data packet, the data is sent to the built playing frame in real time for decoding, and the data is sent to the display equipment for playing through hard decoding.
The invention is further illustrated by the following specific examples:
as shown in fig. 2, the in-vehicle ethernet service program is responsible for providing a functional interface which can be conveniently called to the upper layer application by using the functions provided by the ethernet protocol stack and the service discovery component, or calling the interface of the application according to the received ethernet message to implement the functions of the SOME/IP service.
The onboard ethernet protocol stack encapsulates ethernet protocol related implementations.
The route management program is responsible for unified message receiving and sending of the Ethernet, and the Ethernet service program communicates with the outside world through the route management program.
The service discovery component encapsulates logic related to service discovery.
In the whole scene of instrument information display, the method comprises the following steps:
1. firstly, releasing SOME/IP service on a vehicle machine;
2. the meter client discovers that the service released in the step 1 is on line through the service discovery component;
3. a client subscribes to a service;
4. the vehicle machine sends the state;
5. after a series of interactions, the meter client receives the SOME/IP notification message sent by the vehicle machine;
6. and the meter displays information.
As shown in fig. 3 (a), the application software side mainly completes rendering of the secondary screen control and binding the control with the VirtualDisplay created by the RTP server; the method comprises the following steps:
1. creating a Presentation sub-screen control object and finishing rendering work in the sub-screen control;
2. registering a callback interface of the DisplayManager class, namely a displaylistner interface, so that after a virtualdisplayobject is created in an RTP (real-time transport protocol) server, a displayID of the DisplayListener interface is called in a rendering process;
3. and acquiring a VirtualDisplay object created by the RTP server through the Display ID, so that the VirtualDisplay object of the RTP server is associated with the content rendered in the Presentation sub-screen control in the application layer.
The RTP server finishes the H264 encoding of the image and the RTP data transmission as shown in fig. 3 (b); the method comprises the following steps:
1. creating a MediaCodec object, and initializing the MediaCodec object for encoding an original frame;
2. creating a virtual display object by using the DisplayManager, and when creating the object, introducing a Surface object into a creating function, wherein the Surface object is returned by a createInputSurface method of a MediaCodec class, namely, an input buffer of a MediaCodec encoder object is bound with the created virtual display object;
3, the MediaCodec object needs to register a callback function in the RTP thread, so that the RTP thread can asynchronously acquire the encoded H264 data through the callback function;
4. starting a MediaCodec encoder, associating Surface of an input buffer of the encoder with a VirtualDisplay instance, and associating the VirtualDisplay instance with a Presentation sub-screen control in a rendering process application layer through an ID number of the Display, so that an original frame (rgb or yuv format) in a rendering process is continuously filled into the input buffer of the MediaCodec, and then a video frame which is encoded into H264 data can be continuously taken out from a queue in an asynchronous callback function registered in step 3, and after the encoded H264 data is obtained, an RTP header is added to the encoded H264 data and the RTP header is sent to an RTP receiving end of a meter end as a frame of data.
As shown in fig. 4, the RTP receiving end invokes jrtplib to perform RTP communication with the RTP service end, and after receiving video data, the RTP receiving end invokes a gstreamer interface to send the data to the gstreamer for decoding and displaying, which specifically includes:
an RTP receiving end calls an interface of jrtplib to create an RTPSession, and subsequent RTP communication is based on the RTPSession;
2, an RTP receiving end calls an InitStreamlayer and a StartVideoStream to initialize a gstreamer and create a pipeline for decoding and playing;
3. when an RTP server side starts to send an RTP data packet, a GotoFirstSourcWithData function called by an RTP receiving end blocks and returns, and the GotoFirstSourcWithData function represents the received data;
4, the RTP receiving end circularly calls GotoNextSourceWithData to continuously acquire RTP data packets, the RTP data packets are analyzed and spliced into a complete H264 data packet, and then a feed H264ToPlayer is called to send the data into the established gstreamer pipeline, namely the playing frame;
and 5, circularly calling GotoFirstSourcWithData by the RTP receiving end, blocking if no data arrives, and returning if data exists.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (5)
1. A vehicle-mounted real-time multi-screen projection method based on an android system is characterized by comprising the following steps:
step 1) establishing a vehicle-mounted network physical link between a central control system end and an instrument end based on a vehicle-mounted Ethernet;
step 2) respectively erecting SOME/IP services in the central control system end and the instrument end, and transmitting control messages between the central control system end and the instrument end;
and 3) establishing an RTP server at the central control system end, and establishing an RTP receiving end at the instrument end to transmit and display screen projection contents.
2. The android system-based vehicle-mounted real-time multi-screen projection method according to claim 1, wherein the step 2) specifically comprises:
2-1) the central control system terminal issues SOME/IP service;
2-2) the meter end discovers the SOME/IP service issued by the central control system end through the service discovery component;
2-3) the meter terminal subscribes SOME/IP service;
2-4) the central control system end sends a notification message;
2-5) the instrument end receives and receives the SOME/IP notification message sent by the central control system end and then displays the information.
3. The android system-based vehicle-mounted real-time multi-screen projection method according to claim 1, wherein the step 3) specifically comprises the following steps:
3-1) the application software places the content to be displayed in a standard interface, and obtains the content to be displayed through the association of VirtualDisplay ID in an RTP server; compressing and coding the acquired content to be displayed at an RTP server side, and transmitting the content to an RTP receiving end of an instrument side;
3-2) the RTP receiving end of the meter end decodes the content to be displayed and displays the content on the screen of the meter.
4. The android system-based vehicle-mounted real-time multi-screen projection method according to claim 3, wherein the step 3-1) specifically comprises the following steps:
3-1-1) creating a Presentation sub-screen control in an application layer of the android system, and finishing rendering work in the sub-screen control;
3-1-2) the RTP server creates a VirtualDisplay object in the android system to be associated with the rendering content in the Presentation auxiliary screen control through a Dispaymanager callback interface registered by an application layer;
3-1-3) the RTP server side creates a MediaCodec object in the android system and encodes the original frame;
3-1-4) binding an input buffer area of the MediaCodec object with a VirtualDisplay object created by an RTP server;
3-1-5) the rendering content in the Presentation sub-screen control is continuously filled into a buffer area of the MediaCodec for coding processing;
3-1-6) the RTP thread asynchronously acquires the encoded H264 data through a callback function registered in the RTP thread by the MediaCodec, adds an RTP header to the encoded H264 data, and sends the encoded H264 data as a frame of RTP data to an RTP receiving end of the instrument end.
5. The android system-based vehicle-mounted real-time multi-screen projection method according to claim 3, wherein the step 3-2) specifically comprises the following steps:
3-2-1) receiving and analyzing an RTP protocol set up by an RTP receiving end of the instrument end, receiving data from a specified port, and then calling a specified interface function to analyze and obtain a data packet with the load of H264;
3-2-2) the RTP receiving end analyzes the H264 data packet, the data is sent to the built playing frame in real time for decoding, and the data is sent to the display equipment for playing through hard decoding.
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| CN113297029A (en) * | 2021-04-21 | 2021-08-24 | 惠州市德赛西威智能交通技术研究院有限公司 | QNX end operation information management system and method for dual-system intelligent cockpit |
| CN114205759A (en) * | 2021-11-30 | 2022-03-18 | 上海赫千电子科技有限公司 | Display control method of vehicle-mounted Ethernet display screen |
| CN115061762A (en) * | 2022-06-07 | 2022-09-16 | 阿波罗智联(北京)科技有限公司 | Page display method and device, electronic equipment and medium |
| 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 |
| CN115460442B (en) * | 2022-08-11 | 2024-02-20 | 北京罗克维尔斯科技有限公司 | Screen switching method and device, electronic equipment, readable storage medium and vehicle |
| CN115297357A (en) * | 2022-09-30 | 2022-11-04 | 武汉海微科技有限公司 | Cross-system screen projection method, device and system |
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