CN109104581B - Wireless screen transmission method, system and receiving terminal - Google Patents
Wireless screen transmission method, system and receiving terminal Download PDFInfo
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- CN109104581B CN109104581B CN201810825661.6A CN201810825661A CN109104581B CN 109104581 B CN109104581 B CN 109104581B CN 201810825661 A CN201810825661 A CN 201810825661A CN 109104581 B CN109104581 B CN 109104581B
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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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- 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
- G06F3/1454—Digital output to display device ; Cooperation and interconnection of the display device with other functional units involving copying of the display data of a local workstation or window to a remote workstation or window so that an actual copy of the data is displayed simultaneously on two or more displays, e.g. teledisplay
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
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Abstract
The invention provides a wireless screen transmission method, a wireless screen transmission system and a receiving terminal, wherein the method comprises the following steps: receiving head data and frame data which are sequentially sent by a transmitting terminal; selecting a corresponding decoder according to the header data; and decoding and displaying the frame data by using the corresponding decoder. The receiving end of the invention receives the head data first, selects the corresponding decoder according to the head data, and decodes directly after receiving the frame data, thereby shortening the decoding time, shortening the display time during wireless screen transmission, reducing the waiting time, and avoiding the delay problem of the display content and the actual content during the wireless network screen transmission.
Description
Technical Field
The invention belongs to the technical field of network transmission, and particularly relates to a wireless screen transmission method, a wireless screen transmission system and a receiving terminal.
Background
After the screen video stream data are transmitted to the far end by wireless network transmission, the far end needs to open the video stream data for display, but the screen video stream data can be displayed after buffering certain data when the screen video stream data are opened for the first time, the same-screen opening time of the existing network also needs 3-4 seconds when the network condition is good, so that the picture display can be realized after waiting for a moment after connection, the delay of the display content and the actual content is increased, the reaction time is also increased, the display content can not be opened quickly after connection, and the experience is poor.
In summary, the delay problem of the displayed content and the actual content in the screen transmission process of the wireless network exists in the prior art.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method, a system, and a receiving terminal for wireless screen transmission, so as to solve the problem of delay between displayed content and actual content in the wireless screen transmission process in the prior art.
The first aspect of the embodiments of the present invention provides a wireless screen transmission method, which is applied to a receiving terminal, and the wireless screen transmission method includes:
and receiving the head data and the frame data which are sequentially sent by the transmitting terminal.
And selecting a corresponding decoder according to the header data.
And decoding and displaying the frame data by using the corresponding decoder.
A second aspect of the embodiments of the present invention provides a system for wirelessly transmitting a screen, which is applied to a receiving terminal, and the system for wirelessly transmitting a screen includes:
and the data receiving module is used for receiving the head data and the frame data which are sequentially sent by the transmitting terminal.
And the data analysis module selects a corresponding decoder according to the head data.
And the data analysis module is used for decoding and displaying the frame data by utilizing the corresponding decoder.
A third aspect of the embodiments of the present invention provides a receiving terminal, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the method for wirelessly transmitting a screen as described above when executing the computer program.
A fourth aspect of the embodiments of the present invention provides a computer-readable storage medium, which stores a computer program, and the computer program, when executed by a processor, implements the steps of the method for wirelessly transmitting a screen as described above.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: the data are separately transmitted, so that the receiving end firstly receives the head data, the corresponding decoder is selected according to the head data, and the decoding is directly performed after the frame data are received, thereby avoiding the requirement that the receiving end needs to analyze and decode after receiving a certain amount of data, shortening the decoding time, shortening the display time during wireless screen transmission, reducing the waiting time, and avoiding the delay problem of the display content and the actual content during the wireless network screen transmission.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic flow chart of a method for wirelessly transmitting a screen according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of an implementation of step S102 in fig. 1 according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a system for wirelessly transmitting a screen according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a data analysis module of FIG. 3 according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a receiving terminal according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
The terms "comprises" and "comprising," as well as any other variations, in the description and claims of this invention and the drawings described above, are intended to mean "including but not limited to," and are intended to cover non-exclusive inclusions. For example, a process, method, or system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus. Furthermore, the terms "first," "second," and "third," etc. are used to distinguish between different objects and are not used to describe a particular order.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Hereinafter, a receiving terminal refers to a terminal having data processing capability, including but not limited to a computer, a workstation, a server, and even some Smart phones, palmtop computers, tablet computers, personal digital assistants CPDA (personal digital assistants), Smart televisions (Smart TVs), and the like with excellent performance. The receiving terminal is generally installed with an operating system, including but not limited to a Windows operating system, a LINUX operating system, an android) operating system, a Symbian operating system, a Windows mobile operating system, an iOS operating system, and the like. While specific examples of receiving terminals are listed above in detail, those skilled in the art will appreciate that receiving terminals are not limited to the listed examples.
The wireless screen transmission technology needs several key factors for displaying pictures:
after the sending terminal encodes the screen data into video stream data with a fixed format, the data stream is continuously sent to the receiving terminal through the network.
The receiving terminal needs to buffer the data after receiving the data, and after accumulating the data with a certain size, the format of the data is analyzed, and a corresponding decoder is selected for decoding after the format of the video stream is analyzed.
The decoded data is displayed on the receiving terminal after decoding.
In this process, we find that in the second step, the decoder needs to wait for receiving a certain amount of data before parsing the format of the data stream, that is, the decoder needs to wait for receiving enough data for parsing before working, the waiting time forms a delay, and after parsing the data, the decoder needs to select a response to initialize.
A method for reducing the display time of the first connection of screen transmission is provided for the fact that a decoder of a receiving terminal can work after the decoder needs to wait for receiving enough analyzed data. The method comprises the following steps:
example 1:
fig. 1 shows a flowchart of an implementation of a method for wirelessly transmitting a screen according to an embodiment of the present invention, and for convenience of description, only parts related to the embodiment of the present invention are shown, which is detailed as follows:
as shown in fig. 1, a method for wirelessly transmitting a screen provided in an embodiment of the present invention is applied to a receiving terminal, and the method for wirelessly transmitting a screen includes:
step S101, receiving the head data and the frame data which are sequentially sent by the transmitting terminal.
In this embodiment, header data and frame data received by a receiving terminal are sent by a transmitting terminal, the transmitting terminal encodes video information to obtain encoded data, and the encoded data is composed of the header data and at least one frame data; the transmitting terminal transmits the head data to the receiving terminal, and transmits continuous frame data immediately after the transmitting of the head data.
In this embodiment, there is no other data between the header data and the frame data, and the transmitting terminal transmits the data without interruption in sequence.
In an embodiment of the present invention, before step S101, the method for wirelessly transmitting a screen further includes:
1) and receiving a screen transmission request sent by the transmitting terminal.
2) And judging whether a task with higher priority is executed currently according to the interrupt priority of the screen transmission request.
3) And responding to the screen transmission request if no task with higher priority is executed currently.
In this embodiment, the header data includes format information of the frame data, video resolution, code rate, and packet interval (I frame/P frame ratio in the packet), and is similar to the file header data in mp4, avi, and other formats commonly known by us. The frame data is real video frame data.
And step S102, selecting a corresponding decoder according to the header data.
In this embodiment, after receiving the header data, the receiving terminal selects a corresponding decoder according to the format information of the header data, and only needs to select the corresponding decoder according to the information in the header data without parsing the header data. For example, when the format information in the header data indicates mp4 format, an mp4 decoder is used, and if avl format, an avi decoder is required for decoding.
In this embodiment, the transmitting terminal first transmits the header data to the receiving terminal, and the receiving terminal selects the corresponding decoder according to the format of the header data and initializes the decoder immediately after receiving the header data.
And step S103, decoding and displaying the frame data by using the corresponding decoder.
In this embodiment, after receiving frame data, the receiving terminal decodes the frame data according to the decoder selected by the header data, and displays a corresponding video.
As shown in fig. 2, in an embodiment of the present invention, the step S102 selects a corresponding decoder according to the header data, including;
step S201, reading format information in the header data.
Step S202, selecting a decoder corresponding to the format information.
Step S203, initializing the decoder.
In the prior art, when a video stream starts to be sent, frame data corresponding to the video stream can be stored in video stream head data, the data are sent together with the video data, a decoder needs to complete the video stream head data and then tries to read the video stream head data to select a proper decoding mode to decode a data packet, the decoding mode is limited by a network protocol in the process, the network protocol needs to ensure the completeness and the sequence of the data when processing large blocks of data, the video stream head data can be mixed in an integral data packet to be processed, and the efficiency is seriously reduced.
When screen data is encoded, we have already known the structure of video data, and the format does not change after being transmitted over a network. The transmitting terminal can firstly transmit the key format information to the receiving terminal in a very small data packet, the receiving terminal can prepare a corresponding decoder in advance after receiving the key data, and the decoding work can be started immediately after the real video data is received without waiting for analysis.
The transmitting terminal is added with a process of sending the head data independently in a time slot, but the receiving terminal can complete the work which needs to be done after the data is received originally in advance while receiving the data, so that the whole time is reduced to a certain extent, meanwhile, the head data is sent independently, the time consumed by a TCP protocol in sending large data for verification can be avoided, and the probability that the network is required to be retransmitted after the data is received and the analysis is failed is reduced to a certain extent.
The whole process is carried out, and through adding a process similar to preloading, some works are carried out in parallel on the transmitting terminal and the receiving terminal, so that the overall delay is reduced. The time for receiving a large amount of video stream data is fully utilized to carry out the initialization work in the previous period.
The method ensures that the receiving terminal can immediately start to display the transmitted content without buffering after the transmitting terminal starts to transmit, and shortens the waiting time of waiting 3-4 seconds for the current projection to be within 1 second.
The method reduces the performance occupation of the receiving terminal at the beginning of projection (the performance occupation is reduced compared with the original mode because the previous work is already performed when the display is not started).
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
Example 2:
as shown in fig. 3, in an embodiment of the present invention, a system for wirelessly transmitting a screen is provided, where the system for wirelessly transmitting a screen 100 is configured to perform the method steps in the embodiment corresponding to fig. 1, and includes:
the data receiving module 110 receives header data and frame data sequentially transmitted by the transmitting terminal.
And a data analysis module 120 for selecting a corresponding decoder according to the header data.
And a data analysis module 130 for decoding and displaying the frame data by using the corresponding decoder.
In this embodiment, the header data includes format information of the frame data, video resolution, code rate, and packet interval. And no other data exists between the head data and the frame data, and the head data and the frame data are transmitted by the transmitting terminal in sequence without interruption.
As shown in fig. 4, in the present embodiment, the data analysis module 120 includes:
a format obtaining unit 121, configured to read format information in the header data.
And a decoder selecting unit 122, configured to select a decoder corresponding to the format information.
An initialization unit 123, configured to initialize the decoder.
In this embodiment, the apparatus further includes a selection module, where the selection module includes:
and the signal receiving unit is used for receiving the screen transmission request sent by the transmitting terminal.
And the judging unit is used for judging whether a task with higher priority is executed currently according to the interrupt priority of the screen transmission request.
And the execution unit is used for responding to the screen transmission request if no task with higher priority is executed currently.
It can be clearly understood by those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the foregoing function distribution may be completed by different functional modules according to needs, that is, the internal structure of the wireless screen transmission system is divided into different functional modules to complete all or part of the above-described functions. Each functional module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated module may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional modules are only used for distinguishing one functional module from another, and are not used for limiting the protection scope of the application. For the specific working process of the module in the wireless screen transmission system, reference may be made to the corresponding process of the foregoing method embodiment, which is not described herein again.
Example 3:
fig. 5 is a schematic diagram of a receiving terminal according to an embodiment of the present invention. As shown in fig. 5, the receiving terminal 5 of this embodiment includes: a processor 50, a memory 51 and a computer program 52 stored in said memory 51 and executable on said processor 50. The processor 50, when executing the computer program 52, implements the steps in the embodiments as described in embodiment 1, such as steps S101 to S103 shown in fig. 1. Alternatively, the processor 50, when executing the computer program 52, implements the functions of the modules/units in the system embodiments as described in embodiment 2, such as the functions of the modules 110 to 130 shown in fig. 3.
The receiving terminal 5 may be an intelligent robot, a desktop computer, a notebook, a palm computer, or a cloud server. The receiving terminal may include, but is not limited to, a processor 50, a memory 51. Those skilled in the art will appreciate that fig. 5 is only an example of a receiving terminal 5 and does not constitute a limitation of the receiving terminal 5 and may include more or less components than those shown, or combine certain components, or different components, for example, the receiving terminal 5 may further include input and output devices, network access devices, buses, etc.
The Processor 50 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 51 may be an internal storage unit of the receiving terminal 5, such as a hard disk or a memory of the receiving terminal 5. The memory 51 may also be an external storage device of the receiving terminal 5, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, which are provided on the receiving terminal 5. Further, the memory 51 may also include both an internal storage unit and an external storage device of the receiving terminal 5. The memory 51 is used for storing the computer program and other programs and data required by the receiving terminal 5. The memory 51 may also be used to temporarily store data that has been output or is to be output.
Example 4:
an embodiment of the present invention further provides a computer-readable storage medium, in which a computer program is stored, and the computer program, when executed by a processor, implements the steps in the embodiments described in embodiment 1, for example, step S101 to step S103 shown in fig. 1. Alternatively, the computer program, when executed by a processor, implements the functions of the respective modules/units in the respective system embodiments as described in embodiment 2, for example, the functions of the modules 110 to 130 shown in fig. 3.
The computer program may be stored in a computer readable storage medium, which when executed by a processor, may implement the steps of the various method embodiments described above. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media which may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
The steps in the method of the embodiment of the invention can be sequentially adjusted, combined and deleted according to actual needs.
The modules or units in the system of the embodiment of the invention can be combined, divided and deleted according to actual needs.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed system/terminal device and method can be implemented in other ways. For example, the above-described system/terminal device embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (5)
1. A wireless screen transmission method is characterized by being applied to a receiving terminal;
the wireless screen transmission method comprises the following steps:
receiving a screen transmission request sent by a transmitting terminal;
judging whether a task with higher priority is executed currently or not according to the interrupt priority of the screen transmission request;
if no task with higher priority is executed currently, responding to the screen transmission request;
receiving head data and frame data which are sequentially sent by a transmitting terminal, wherein the transmitting terminal firstly sends the head data to a receiving terminal, and continuously sends the frame data immediately after sending the head data, and the head data comprises format information, video resolution, code rate and data packet interval of the frame data;
reading format information in the header data;
selecting a decoder corresponding to the format information;
initializing the decoder;
and decoding and displaying the frame data by using the corresponding decoder, receiving the head data by the receiving terminal, selecting the corresponding decoder according to the head data, and directly decoding after receiving the frame data.
2. A method for wirelessly transmitting a screen as claimed in claim 1, wherein there is no other data between the header data and the frame data, and the data is transmitted by the transmitting terminal continuously in sequence.
3. A wireless screen transmission system is applied to a receiving terminal and comprises:
the data receiving module is used for receiving head data and frame data which are sequentially sent by a transmitting terminal, wherein the head data comprises format information, video resolution, code rate and data packet interval of the frame data;
the data analysis module is used for selecting a corresponding decoder according to the head data;
the data analysis module is used for decoding and displaying the frame data by utilizing the corresponding decoder;
the data analysis module comprises;
a format obtaining unit, configured to read format information in the header data;
a decoder selecting unit, configured to select a decoder corresponding to the format information;
an initialization unit for initializing the decoder;
the system for wirelessly transmitting the screen further comprises a selection module, wherein the selection module comprises:
the signal receiving unit is used for receiving a screen transmission request sent by the transmitting terminal;
the judging unit is used for judging whether a task with higher priority is executed at present according to the interrupt priority of the screen transmission request;
and the execution unit is used for responding to the screen transmission request if no task with higher priority is executed currently.
4. A receiving terminal comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method for wirelessly transmitting a screen according to any one of claims 1 to 2 when executing the computer program.
5. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 2.
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| CN113079578B (en) * | 2021-03-29 | 2022-06-14 | 成都飞鱼星科技股份有限公司 | Smart screen wireless screen projection data priority transmission method and system |
| CN113727181B (en) * | 2021-08-30 | 2024-05-17 | 努比亚技术有限公司 | Screen-throwing time delay dynamic configuration method, equipment and computer readable storage medium |
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| JP2003061140A (en) * | 2001-08-09 | 2003-02-28 | Sharp Corp | Mobile terminal and recording medium for recording information display program |
| CN101977324A (en) * | 2010-11-09 | 2011-02-16 | 青岛海信宽带多媒体技术有限公司 | Method for realizing screen sharing |
| CN103414894A (en) * | 2013-07-29 | 2013-11-27 | 上海凯统信息科技有限公司 | Wireless real-time screen transfer equipment and method |
| CN106897038A (en) * | 2015-12-17 | 2017-06-27 | 北京传送科技有限公司 | One kind throws screen system |
| CN106658176A (en) * | 2016-11-07 | 2017-05-10 | 广州视源电子科技股份有限公司 | Remote video display method and system |
| CN108255447A (en) * | 2016-12-29 | 2018-07-06 | 乐视汽车（北京）有限公司 | For reducing the method for projection delay, data processing equipment and mobile equipment |
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| CN106034252A (en) * | 2015-03-12 | 2016-10-19 | 深圳市腾讯计算机系统有限公司 | Streaming media processing method and device |
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| CN107438199A (en) * | 2016-05-29 | 2017-12-05 | 刘健文 | One kind passes screen video display terminal |
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