CN115174537B - Double-screen interaction method and system for vehicle-computer interaction - Google Patents
Double-screen interaction method and system for vehicle-computer interaction Download PDFInfo
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- CN115174537B CN115174537B CN202210769574.XA CN202210769574A CN115174537B CN 115174537 B CN115174537 B CN 115174537B CN 202210769574 A CN202210769574 A CN 202210769574A CN 115174537 B CN115174537 B CN 115174537B
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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
- H04N19/42—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
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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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/14—Session management
- H04L67/141—Setup of application sessions
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The application provides a dual-screen interaction method and a system for vehicle-computer interaction, comprising the following steps: establishing a communication link between a machine end and an instrument end of the vehicle; matching a data transmission channel according to the data type of the first screen access data source of the vehicle-mounted terminal, and communicating the communication link through the corresponding data transmission channel to establish connection with the instrument terminal, wherein the data type comprises a video stream; if the data source is video data, splitting a video frame in the video data into data packets with preset sizes for compression coding to obtain a data code stream; and outputting the data code stream to the instrument end through the communication link so as to decode the data code stream and display the decoded data code stream in a second screen of the instrument end. The method and the device can greatly improve the applicability of double-screen interaction and meet the requirements of different configuration vehicle types.
Description
Technical Field
The application relates to the field of intelligent cabins, in particular to a double-screen interaction method and system for vehicle-machine interaction.
Background
Along with the development of intelligent automobiles, the display of the intelligent cabins changes to 3D, and the trend of multi-screen display changes. At present, most of cockpit vehicles are combined by a digital instrument and a central control screen, wherein the central control screen comprises functions of navigation, multimedia, vehicle-mounted control and the like, and the instrument displays vehicle information and the like. The instrument screen directly faces the driver, and the central control screen does not directly face the driver, so that a navigation picture is projected onto the instrument, and driving can be safer. Most of the double-screen interaction systems at present use two wires for data transmission, one is a USB wire for transmitting control instructions and files, and the other is an LVDS wire special for transmitting video and audio.
Disclosure of Invention
In view of the problems in the prior art, the application provides a dual-screen interaction method and a dual-screen interaction system for vehicle-computer interaction, which mainly solve the problems that the existing dual-screen interaction is limited by a transmission mode, and is high in cost and difficult to be downwardly compatible with a low-profile vehicle type.
In order to achieve the above and other objects, the technical solutions adopted in the present application are as follows.
The application provides a vehicle-machine interaction double-screen interaction method, which comprises the following steps:
establishing a communication link between a machine end and an instrument end of the vehicle;
matching a data transmission channel according to the data type of the first screen access data source of the vehicle-mounted terminal, and communicating the communication link through the corresponding data transmission channel to establish connection with the instrument terminal, wherein the data type comprises a video stream;
if the data source is video data, splitting a video frame in the video data into data packets with preset sizes for compression coding to obtain a data code stream;
and outputting the data code stream to the instrument end through the communication link so as to decode the data code stream and display the decoded data code stream in a second screen of the instrument end.
In an embodiment of the present application, establishing a communication link between a control end and an instrument end of a vehicle includes:
and establishing local area network communication connection between the control end and the instrument end through a preset interface protocol, and taking a connection path formed by a corresponding interface as the communication link.
In an embodiment of the present application, matching a data transmission channel according to a data type of a first screen access data source of the vehicle-mounted device, and connecting the communication link to the meter terminal through the corresponding data transmission channel, where the method includes:
according to the data type of the data source, calling the corresponding relation between the preset data type and the transmission port number, and determining the transmission port number matched with the data source;
and calling a corresponding transmission channel to be in butt joint with the communication link according to the transmission port number, and establishing the connection between the machine end and the instrument end of the vehicle.
In an embodiment of the present application, the data type further includes a control instruction and a file;
before the corresponding relation between the preset data type and the transmission port number is called according to the data type of the data source, the method comprises the following steps:
and allocating transmission port numbers for control instructions, files and video streams in advance, and establishing a corresponding relation between data types and the transmission port numbers, wherein the control instructions and the files share one transmission port number.
In an embodiment of the present application, if the data type of the data source is a control instruction or a file, a communication connection between the vehicle machine end and the instrument end is established through a socket, so as to perform data transmission of the data source.
In an embodiment of the present application, splitting a video frame in the video data into data packets with a preset size for compression encoding to obtain a data code stream includes:
and encoding the data packet into an H264 original code stream as the data code stream.
The application also provides a vehicle-computer interaction double-screen interaction system, which comprises:
the link construction module is used for establishing a communication link between the machine end and the instrument end of the vehicle;
the connection establishment module is used for matching a data transmission channel according to the data type of the first screen access data source of the vehicle-mounted terminal, and communicating the communication link through the corresponding data transmission channel to establish connection with the instrument terminal, wherein the data type comprises a video stream;
the video coding module is used for splitting a video frame in the video data into data packets with preset sizes to perform compression coding if the data source is the video data, so as to obtain a data code stream;
and the decoding display module is used for outputting the data code stream to the instrument end through the communication link so as to decode the data code stream and then display the decoded data code stream in a second screen of the instrument end.
In an embodiment of the present application, the vehicle machine end and the meter end establish a communication link through a USB interface.
As described above, the dual-screen interaction method and system for vehicle-computer interaction have the following beneficial effects.
The method comprises the steps of establishing a communication link between a machine end and an instrument end of the vehicle; matching a data transmission channel according to the data type of the first screen access data source of the vehicle-mounted terminal, and communicating the communication link through the corresponding data transmission channel to establish connection with the instrument terminal, wherein the data type comprises a video stream; if the data source is video data, splitting a video frame in the video data into data packets with preset sizes for compression coding to obtain a data code stream; outputting the data code stream to the instrument end through the communication link for decoding the data code stream and displaying the decoded data code stream at a designated position in a second screen of the instrument end; according to the method and the device, the data interaction of the data source at the vehicle-mounted terminal and the instrument terminal can be realized through the unified communication link, the data source transmission of different data types can be completed only through the butt joint communication link of the transmission channel matched with the data types, the data transmission line is not required to be independently provided for the video source, and the cost can be effectively reduced.
Drawings
Fig. 1 is a flow chart of a dual-screen interaction method for vehicle-computer interaction in an embodiment of the application.
Fig. 2 is a block diagram of an architecture for video streaming in an embodiment of the present application.
Fig. 3 is a block diagram of a dual-screen interaction system for vehicle-computer interaction in an embodiment of the application.
Detailed Description
Other advantages and effects of the present application will become apparent to those skilled in the art from the present disclosure, when the following description of the embodiments is taken in conjunction with the accompanying drawings. The present application may be embodied or carried out in other specific embodiments, and the details of the present application may be modified or changed from various points of view and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
It should be noted that, the illustrations provided in the following embodiments merely illustrate the basic concepts of the application by way of illustration, and only the components related to the application are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complex.
Referring to fig. 1, the application provides a dual-screen interaction method for vehicle-computer interaction, which includes the following steps:
and S01, establishing a communication link between the machine end and the instrument end of the vehicle.
In one embodiment, establishing a communication link between a control side and an instrument side of a vehicle includes:
and establishing local area network communication connection between the control end and the instrument end through a preset interface protocol, and taking a connection path formed by a corresponding interface as the communication link.
In an embodiment, in order to enable the vehicle terminal and the instrument terminal to complete data transmission interaction through a common communication link, the vehicle terminal and the instrument terminal can be connected through a USB interface to form a communication link based on a preset USB protocol, the two ends of the communication link are used for data transmission based on Socket sockets, the vehicle terminal and the instrument terminal are respectively used as Socket terminals, further, socket local area network communication is established, data transmission is performed based on a local area network, and data transmission rate is guaranteed. The communication protocol corresponding to the communication link may be configured according to practical application requirements, which is not limited herein.
Step S02, a data transmission channel is matched according to the data type of the first screen access data source of the vehicle machine side, the communication link is communicated through the corresponding data transmission channel to establish connection with the instrument side, and the data type comprises a video stream.
In an embodiment, the application relates to two systems, one is that the central Android system corresponds to a vehicle machine end, and the other is that the meter QNX system corresponds to a meter end. The vehicle part comprises 3 lines of control instructions, files and videos, the files and the control instructions are arranged in the same architecture, and the videos are transmitted in an independent architecture. The file transmission mainly relates to upgrade file and log file transmission, the control instruction comprises dialing a call, playing songs and the like, and the video mainly displays the navigation of the vehicle and the machine to the instrument end. The first screen of the vehicle terminal can receive data sources with different data types, such as receiving a touch screen control instruction to control multimedia to play music, answer a call, navigate control, screen capture data and the like. The data source of the vehicle-mounted terminal can be divided into three data types, including control instructions, files and video streams. Different transmission modes are adopted based on different data types.
In an embodiment, the matching a data transmission channel according to a data type of the first screen access data source of the vehicle machine end, and communicating the communication link through the corresponding data transmission channel to establish connection with the instrument end, includes:
according to the data type of the data source, calling the corresponding relation between the preset data type and the transmission port number, and determining the transmission port number matched with the data source;
and calling a corresponding transmission channel to be in butt joint with the communication link according to the transmission port number, and establishing the connection between the machine end and the instrument end of the vehicle.
In an embodiment, before invoking the corresponding relationship between the preset data type and the transmission port number according to the data type of the data source, the method includes:
and allocating transmission port numbers for control instructions, files and video streams in advance, and establishing a corresponding relation between data types and the transmission port numbers, wherein the control instructions and the files share one transmission port number.
In an embodiment, if the data type of the data source is a control instruction or a file, a communication connection between the vehicle machine end and the instrument end is established through a socket so as to perform data transmission of the data source.
In an embodiment, corresponding transmission port numbers can be configured for data types of different data sources possibly accessed by the vehicle-mounted terminal, a corresponding relationship between the transmission port numbers and the data types is established, and the corresponding relationship is stored in the vehicle-mounted terminal. When the first screen of the vehicle machine side is accessed to the data source, firstly judging the data type accessed to the data source, and calling the corresponding relation according to the data type to obtain a transmission port number corresponding to the data type. The transmission port number is mainly used to represent a transmission channel, and the transmission channel of the current data source requirement can be determined based on the transmission port number. And docking the transmission channel with the communication link to establish a local communication network for communicating the vehicle machine end and the instrument end.
In an embodiment, the control command and the file may share a transmission port number, and the data type corresponding to the video stream may be assigned a different transmission port number than the control command.
Step S03, if the data source is video data, splitting a video frame in the video data into data packets with preset sizes for compression coding to obtain a data code stream.
Referring to fig. 2, the vehicle may include a video stream capturing and encoding module and a transmission module, and the meter includes a transmission module and a decoding display module. The vehicle-mounted video capturing and encoding module and the transmission module establish local area network communication, data can be quickly transmitted, the Android transmission end and the instrument transmission end establish local area network communication through USB connection, and Socket connection is established by adopting port numbers different from the file and the control instruction channel so as to transmit the data.
The central control realizes the real-time acquisition of navigation video stream data through Android SurfaceComposerClient technology, but the acquired data is too large to directly transmit a complete frame of data, and the data needs to be subdivided to be conveniently transmitted, so the compressed video data is encoded by MediaCodec after the data is intercepted, the video data is encoded into an H264 original code stream in this way, and the code stream consists of NALUs which are connected one by one, so that the transmission is convenient. The video streaming adopts Socket local area network communication based on USB, in order to be convenient for analyze and improve the stability of transmission, prevent losing the frame, can dispose corresponding video transmission protocol. The particular video transmission protocol may be adapted according to the application requirements and is not limited herein.
And step S04, outputting the data code stream to the instrument end through the communication link so as to decode the data code stream and display the decoded data code stream in a second screen of the instrument end.
In an embodiment, after the data is received by the meter-end transport layer, the data is decoded into video data that can be played by using a decoder according to the transport protocol set previously, and then the video data is displayed at the corresponding position of the second screen.
The LVDS line in the existing dual-screen interaction is removed, and the full function of the dual-screen interaction is achieved through a shared USB line. Corresponding to the original scheme, the method adopts Socket to realize transmission of control instructions, files and video streams, and only adopts different ports for communication of each type.
In an embodiment, as shown in fig. 3, the present application provides a dual-screen interaction system for vehicle-computer interaction, including:
the link construction module 10 is used for establishing a communication link between the machine end and the instrument end of the vehicle;
the connection establishing module 11 is configured to match a data transmission channel according to a data type of a first screen access data source of the vehicle-mounted device, and connect the communication link to the meter terminal through the corresponding data transmission channel to establish a connection, where the data type includes a video stream;
the video coding module 12 is configured to split a video frame in the video data into data packets with a preset size to perform compression coding if the data source is video data, so as to obtain a data code stream;
the decoding display module 13 is configured to output the data code stream to the meter end through the communication link, so as to decode the data code stream and display the decoded data code stream on a second screen of the meter end.
In an embodiment, the vehicle machine end and the instrument end establish a communication link through a USB interface.
In one embodiment, the link construction module 10 includes a communication link between a control end and an instrument end of a vehicle, including: and establishing local area network communication connection between the control end and the instrument end through a preset interface protocol, and taking a connection path formed by a corresponding interface as the communication link.
In one embodiment, the connection establishment module 11 includes: matching a data transmission channel according to the data type of the first screen access data source of the vehicle-mounted terminal, communicating the communication link through the corresponding data transmission channel to establish connection with the instrument terminal, and comprising the following steps: according to the data type of the data source, calling the corresponding relation between the preset data type and the transmission port number, and determining the transmission port number matched with the data source; and calling a corresponding transmission channel to be in butt joint with the communication link according to the transmission port number, and establishing the connection between the machine end and the instrument end of the vehicle.
In one embodiment, the system further comprises: the port association module is configured to, before invoking the corresponding relationship between the preset data type and the transmission port number according to the data type of the data source, include: and allocating transmission port numbers for control instructions, files and video streams in advance, and establishing a corresponding relation between data types and the transmission port numbers, wherein the control instructions and the files share one transmission port number.
In an embodiment, the port association module further comprises: if the data type of the data source is a control instruction or a file, the communication connection between the vehicle-mounted terminal and the instrument terminal is established through a socket so as to carry out data transmission of the data source.
In one embodiment, video encoding module 12 includes: splitting a video frame in the video data into data packets with preset sizes for compression coding to obtain a data code stream, wherein the method comprises the following steps of: and encoding the data packet into an H264 original code stream as the data code stream.
The foregoing embodiments are merely illustrative of the principles of the present application and their effectiveness, and are not intended to limit the application. Modifications and variations may be made to the above-described embodiments by those of ordinary skill in the art without departing from the spirit and scope of the present application. Accordingly, it is intended that all equivalent modifications and variations which may be accomplished by persons skilled in the art without departing from the spirit and technical spirit of the disclosure be covered by the claims of this application.
Claims (8)
1. The double-screen interaction method for vehicle-computer interaction is characterized by comprising the following steps of:
establishing a communication link between a machine end and an instrument end of the vehicle, comprising: the vehicle machine end and the instrument end can be connected through a USB interface to form a communication link based on a preset USB protocol;
matching a data transmission channel according to the data type of the first screen access data source of the vehicle-mounted terminal, communicating the communication link through the corresponding data transmission channel to establish connection with the instrument terminal, and comprising the following steps: configuring corresponding transmission port numbers according to data types of different data sources accessed by the vehicle-mounted terminal, establishing a corresponding relation between the transmission port numbers and the data types, and storing the corresponding relation in the vehicle-mounted terminal; when a first screen of the vehicle machine side is accessed to a data source, firstly judging the data type accessed to the data source, and calling the corresponding relation according to the data type to obtain a transmission port number corresponding to the data type; the transmission port number is mainly used for representing a transmission channel, and the transmission channel required by the current data source is determined based on the transmission port number; the method comprises the steps of docking a transmission channel with a communication link to establish a local communication network for communicating a vehicle machine end and an instrument end, wherein the data types comprise video streams, control instructions and files, the control instructions and the files share a transmission port number, and the data types corresponding to the video streams are distributed with a transmission port number different from the control instructions;
if the data source is video data, splitting a video frame in the video data into data packets with preset sizes for compression coding to obtain a data code stream;
and outputting the data code stream to the instrument end through the communication link so as to decode the data code stream and display the decoded data code stream in a second screen of the instrument end.
2. The method for dual-screen interaction of vehicle-computer interaction of claim 1, wherein establishing a communication link between a control end and an instrument end of a vehicle comprises:
and establishing local area network communication connection between the control end and the instrument end through a preset interface protocol, and taking a connection path formed by a corresponding interface as the communication link.
3. The method for dual-screen interaction of vehicle-computer interaction of claim 1, wherein the matching of the data transmission channels according to the data types of the first screen access data source of the vehicle-computer terminal, and the communication link is communicated through the corresponding data transmission channel to establish connection with the instrument terminal, comprises:
according to the data type of the data source, calling the corresponding relation between the preset data type and the transmission port number, and determining the transmission port number matched with the data source;
and calling a corresponding transmission channel to be in butt joint with the communication link according to the transmission port number, and establishing the connection between the machine end and the instrument end of the vehicle.
4. The method for two-screen interaction of vehicle-computer interaction according to claim 1 or 3, wherein the data type further comprises control instructions and files;
before the corresponding relation between the preset data type and the transmission port number is called according to the data type of the data source, the method comprises the following steps:
and allocating transmission port numbers for control instructions, files and video streams in advance, and establishing a corresponding relation between data types and the transmission port numbers, wherein the control instructions and the files share one transmission port number.
5. The method of claim 4, wherein if the data type of the data source is a control command or a file, the communication connection between the vehicle-mounted terminal and the instrument terminal is established through a socket so as to perform data transmission of the data source.
6. The method for dual-screen interaction of vehicle-computer interaction of claim 1, wherein splitting the video frames in the video data into data packets with preset sizes for compression encoding to obtain a data code stream comprises the following steps:
and encoding the data packet into an H264 original code stream as the data code stream.
7. A dual-screen interactive system for vehicle-to-machine interaction, comprising:
the link construction module is used for establishing a communication link between a machine end and an instrument end of the vehicle and comprises the following components: the vehicle machine end and the instrument end can be connected through a USB interface to form a communication link based on a preset USB protocol;
the connection establishment module is configured to match a data transmission channel according to a data type of the first screen access data source of the vehicle-mounted terminal, and communicate the communication link through the corresponding data transmission channel to establish connection with the instrument terminal, and includes: configuring corresponding transmission port numbers according to data types of different data sources accessed by the vehicle-mounted terminal, establishing a corresponding relation between the transmission port numbers and the data types, and storing the corresponding relation in the vehicle-mounted terminal; when a first screen of the vehicle machine side is accessed to a data source, firstly judging the data type accessed to the data source, and calling the corresponding relation according to the data type to obtain a transmission port number corresponding to the data type; the transmission port number is mainly used for representing a transmission channel, and the transmission channel required by the current data source is determined based on the transmission port number; the method comprises the steps of docking a transmission channel with a communication link to establish a local communication network for communicating a vehicle machine end and an instrument end, wherein the data types comprise video streams, control instructions and files, the control instructions and the files share a transmission port number, and the data types corresponding to the video streams are distributed with a transmission port number different from the control instructions;
the video coding module is used for splitting a video frame in the video data into data packets with preset sizes to perform compression coding if the data source is the video data, so as to obtain a data code stream;
and the decoding display module is used for outputting the data code stream to the instrument end through the communication link so as to decode the data code stream and then display the decoded data code stream in a second screen of the instrument end.
8. The interactive system according to claim 7, wherein the vehicle-mounted terminal and the meter terminal establish a communication link through a USB interface.
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