CN111885412B - HDMI signal screen transmission method and wireless screen transmission device - Google Patents
HDMI signal screen transmission method and wireless screen transmission device 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
- H04N21/43—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
- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
- H04N21/4363—Adapting the video stream to a specific local network, e.g. a Bluetooth® network
- H04N21/43632—Adapting the video stream to a specific local network, e.g. a Bluetooth® network involving a wired protocol, e.g. IEEE 1394
- H04N21/43635—HDMI
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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
- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
- H04N21/4363—Adapting the video stream to a specific local network, e.g. a Bluetooth® network
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- 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
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
- H04N21/4402—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display
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- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
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Abstract
The invention discloses an HDMI signal screen transmission method based on TYPE-C interface and a wireless screen transmitter, wherein the method comprises the following steps: when a TYPE-C interface of the screen transmitter receives file information transmitted by source equipment, a signal conversion module of the screen transmitter identifies whether a first port on the TYPE-C interface receives the file information; if not, the signal conversion module identifies whether a second port on the TYPE-C interface has file receiving information or not; if yes, the signal conversion module carries out HDMI signal conversion coding on the file information according to an internal execution program, and the generated HDMI audio and video data are transmitted to a video coding module of the screen transmitter through an HDMI interface of the screen transmitter; the video coding module compresses the HDMI audio/video data into a network stream audio/video packet, and the network stream audio/video packet is transmitted to the display device through the network transmission module of the screen transmitter. The invention takes two different interfaces as channels, and combines the signal conversion module and the video coding module to ensure the optimal screen transmission effect.
Description
Technical Field
The invention relates to the technical field of multimedia screen transmission, in particular to an HDMI signal screen transmission method based on a TYPE-C interface and a wireless screen transmitter.
Background
The wireless screen transmission technology is intended to provide a platform for connecting, controlling and participating in displaying for a plurality of wireless terminals in a wireless environment, is suitable for environments such as business demonstration, teaching demonstration, home entertainment and the like, and has the advantages that the wireless screen transmission technology can be arranged at any time without perforation wiring, so that centralized activities such as intelligent and multimedia wireless conferences and multimedia teaching are gradually developed.
The wireless screen transmission method which is popular in the market at present comprises a wireless screen transmission method based on a TYPE-C interface and a wireless screen transmission method based on an HDMI interface, and the two methods are different in the data transmission capacity of the interfaces and the working property of internal coding chips. In view of the fact that the HDMI interface is a high-definition multimedia interface and is matched with a digital content protection function, the most efficient video transmission (audio/video transmission) can be achieved after the HDMI interface is adapted to a dedicated encoding chip, and in addition, the function improvement of the current wireless screen transmitter is developed toward a multi-interface technology, so that technical personnel propose to perform technical fusion on the two screen transmitting methods, however, how to improve different signal conversion capabilities and data transmission reliability is a problem to be considered in the present invention.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides an HDMI signal screen transmission method based on a TYPE-C interface and a wireless screen transmitter.
Correspondingly, the invention provides an HDMI signal screen transmission method based on a TYPE-C interface, which comprises the following steps:
when a TYPE-C interface of a screen transmitter receives file information transmitted by external source equipment, a signal conversion module of the screen transmitter identifies whether a first port on the TYPE-C interface receives the file information;
if the first port is identified not to receive the file information, the signal conversion module identifies whether a second port on the TYPE-C interface receives the file information;
if the second port is identified to receive the file information, the signal conversion module carries out HDMI signal conversion coding on the file information according to an execution program written in the signal conversion module, and transmits generated HDMI audio and video data to a video coding module of the screen transmission device based on an HDMI interface of the screen transmission device;
the video coding module compresses the HDMI audio and video data into a network stream audio and video packet, and the network transmission module based on the screen transmission device transmits the network stream audio and video packet to an external display device for decoding and displaying.
Optionally, the performing, by the signal conversion module, HDMI signal conversion coding on the file information according to an execution program written inside includes:
the written executive program is stored in the memory of the signal conversion module, and the processor of the signal conversion module calls the executive program and carries out HDMI signal conversion coding on the file information based on the executive program.
Optionally, the first port is configured to provide a channel through which the external source device transmits the program update file to the processor, and the second port is configured to provide a channel through which the external source device transmits the audio and video data to the processor.
Optionally, after the signal conversion module of the screen transmitter identifies whether the first port on the TYPE-C interface receives the file information, the method further includes:
and if the first port is identified to receive the file information, the processor carries out version updating processing on the executive program in the memory based on the file information, and then returns to re-identify whether the first port on the TYPE-C interface receives new file information.
Optionally, before the TYPE-C interface of the screen transmitter receives file information transmitted by the external source device, the method further includes:
and the external source equipment reads the executive program written in the memory based on a third port on the TYPE-C interface and generates the file information based on the version verification result of the executive program, wherein the third port is used for providing a channel for the external source equipment to access the memory.
Optionally, before the signal conversion module identifies whether the second port on the TYPE-C interface receives the file information, the method further includes:
the network transmission module establishes a wireless connection with the external display device based on the transmitted radio waves, which include a preset field and an encoding field.
Optionally, the preset field at least includes a wireless hotspot name of the network transmission module, and the encoding field at least includes a login password of the network transmission module.
Correspondingly, the embodiment of the invention also provides a wireless screen transmitter, which comprises a TYPE-C interface, an HDMI interface, a signal conversion module, a video coding module and a network transmission module, wherein the signal conversion module is connected with external source equipment through the TYPE-C interface, the video coding module is connected with the signal conversion module through the HDMI interface, the network transmission module is connected with the video coding module, and the network transmission module is wirelessly connected with external display equipment; wherein the content of the first and second substances,
the TYPE-C interface is used for receiving file information transmitted by the external source equipment;
the signal conversion module is used for identifying whether a first port and a second port on the TYPE-C interface receive the file information or not; based on the fact that the first port does not receive the file information and the second port receives the file information, carrying out HDMI signal conversion coding on the file information according to an execution program written in the first port and generating HDMI audio and video data;
the HDMI is used for transmitting the HDMI audio and video data to the video coding module;
the video coding module is used for compressing the HDMI audio and video data into a network stream audio and video packet and transmitting the network stream audio and video packet to the network transmission module;
and the network transmission module is used for transmitting the network stream audio and video packet to the external display equipment for decoding and displaying.
Optionally, the signal conversion module includes a processor and a memory, and the processor is connected to the memory based on a signal line;
the memory is used for storing an executive program, and the executive program at least comprises a plurality of operating instructions for converting the TYPE-C signal into an HDMI signal by the processor;
the processor is used for calling the execution program and carrying out HDMI signal conversion coding on the file information based on the execution program.
Optionally, the first port is configured to provide a channel through which the external source device transmits the program update file to the processor, and the second port is configured to provide a channel through which the external source device transmits the audio and video data to the processor.
Based on the method of the embodiment of the invention, the execution program stored by the signal conversion module is firstly inquired and updated in an auxiliary way through the external source equipment, so that the signal conversion module has high efficiency and accuracy in the process of completing the conversion of the TYPE-C signal carrying audio and video data; and based on the digital content protection function of the HDMI interface, the optimal screen sensing effect can be guaranteed by matching with the video coding module, so that the user experience is met. According to the wireless screen transmitter, the video coding module is mainly provided with the HDMI special chip, the TYPE-C interface is used as a main screen transmitting interface and the HDMI interface is used as an auxiliary screen transmitting interface in the actual use process, so that external source equipment with the TYPE-C interface can transmit interface data in real time; on the other hand, the HDMI can be used as an independent screen transmission interface, so that the external source equipment with the HDMI can also complete screen transmission, and the practicability is good.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a wireless screen transmitter disclosed in an embodiment of the present invention;
fig. 2 is a schematic flow chart of an HDMI signal screen transmission method based on a TYPE-C interface disclosed in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 shows a schematic structural diagram of a wireless screen transmitter in an embodiment of the present invention, where the wireless screen transmitter includes: TYPE-C interface, HDMI interface, signal conversion module, video coding module and network transmission module, the signal conversion module passes through TYPE-C interface is connected with external source equipment, the video coding module passes through the HDMI interface with the signal conversion module is connected, network transmission module with the video coding module is connected, network transmission module and external display equipment wireless connection.
Specifically, the signal conversion module includes a processor and a memory, the processor is connected with the memory based on a signal line, the processor has functions of calling and version updating an executive program written in the memory, and high-efficiency accuracy of the signal conversion module in a TYPE-C signal conversion process can be guaranteed.
Specifically, be provided with first port, second port and the third port that can supply information transmission on the TYPE-C interface, first port can indirectly communicate external source equipment with the first pin of treater, the second port can indirectly communicate external source equipment with the second pin of treater, the third port can indirectly communicate external source equipment with the memory. In the implementation process, the first port realizes the transmission of the update file of the executive program, the second port realizes the access of a TYPE-C signal carrying audio and video data, and the third port realizes the information query function of the memory, so that the external source equipment can pass through the wired communication of the signal conversion module and is assisted to complete the function update of the signal conversion module.
Specifically, the HDMI interface includes HDMI male joint and HDMI female joint in fact, the HDMI female joint with the signal conversion module is connected, the HDMI male interface with the video coding module is connected, promptly: the TYPE-C interface the signal conversion module with the female joint of HDMI can form TYPE-C adapter, the female joint of HDMI the video coding module with the network transmission module can form HDMI and pass the screen ware. In the application, on the one hand HDMI passes the screen ware and can accomplish independent pass screen work to the external source equipment that has the HDMI interface, and on the other hand passes through the HDMI female joint with the butt joint of HDMI male joint, pass through promptly TYPE-C adapter with the combination that HDMI passed the screen ware can accomplish to the external source equipment that has TYPE-C interface and pass screen work, accords with the requirement of current wireless screen ware towards many interface technological development that passes, makes wireless screen ware that passes has good practicality.
It should be noted that, in the embodiment of the present invention, the network transmission module uses a mature WiFi module to perform wireless data transmission, and an additional bluetooth module may be added or replaced with a bluetooth module according to a network condition, so as to enhance the screen transmission success rate of the wireless screen transmitter.
The wireless screen transmitter provided by the embodiment of the invention realizes the HDMI signal screen transmitting method based on the TYPE-C interface, and comprises the following steps: when a TYPE-C interface of a screen transmitter receives file information transmitted by external source equipment, a signal conversion module of the screen transmitter identifies whether a first port on the TYPE-C interface receives the file information; if the first port is identified not to receive the file information, the signal conversion module identifies whether a second port on the TYPE-C interface receives the file information; if the second port is identified to receive the file information, the signal conversion module carries out HDMI signal conversion coding on the file information according to an execution program written in the signal conversion module, and transmits generated HDMI audio and video data to a video coding module of the screen transmission device based on an HDMI interface of the screen transmission device; the video coding module compresses the HDMI audio and video data into a network stream audio and video packet, and the network transmission module based on the screen transmission device transmits the network stream audio and video packet to an external display device for decoding and displaying.
Specifically, fig. 2 shows a schematic flow chart of an HDMI signal screen transmission method based on a TYPE-C interface in the embodiment of the present invention, where the method includes the following steps:
s101, reading an executive program written in a signal conversion module of a screen transmitter by external source equipment based on a third port on a TYPE-C interface of the screen transmitter, and generating file information based on a version verification result of the executive program;
when the screen transmission device is connected with the external source device based on the TYPE-C interface, a plurality of communication ports are provided for the external source device, and the plurality of communication ports can be identified by the general driver of the external source device so as to confirm establishment of wired communication connection between the screen transmission device and the external source device. The external source device may be a general-purpose device such as a laptop whose operating system is Windows or Mac, or a personal mobile terminal whose operating system is Android or iOS.
Based on the signal conversion module includes a processor and a memory, the plurality of communication ports at least include a first port, a second port and a third port, wherein the first port is used for providing a channel for the external source device to transmit a program update file to the processor, the second port is used for providing a channel for the external source device to transmit audio and video data to the processor, and the third port is used for providing a channel for the external source device to access the memory.
In the implementation process of the invention, the external source device preferentially reads the executive program written in the memory through the third port and acquires the first version information of the executive program; meanwhile, the external source equipment reads an installation directory set by the internal screen transmission server and acquires second version information of a latest execution program stored in the installation directory, wherein the latest execution program is an improvement of a technician on an existing execution program; judging whether the first version information is consistent with the second version information; if the first version information is the same as the second version information, the screen transmission server starts an internal screen capturing program to capture the current interface data of the external source equipment, and file information carrying audio and video data is generated; and if the first version information is different from the second version information, the screen transmission server copies and packs the latest executive program under the installation directory to generate file information carrying the latest executive program.
S102, when the TYPE-C interface receives file information transmitted by the external source equipment, the signal conversion module identifies whether a first port on the TYPE-C interface receives the file information;
specifically, the processor in the signal conversion module judges whether the first port receives the file information by identifying whether a first pin connected with the first port has level change according to a specified priority level; if the first pin is identified to be maintained at the initial level (low level), which indicates that the first port does not receive the file information, jumping to execute step S104; if the first pin is identified as high level, it indicates that the first port has received the file information, and at this time, indicates that the file information is file information carrying a latest execution program, and continues to execute step S103.
It should be noted that, the priority level limits that the processor needs to first ensure that the execution program written in the memory is the latest version before the execution program can be executed to perform signal conversion, so as to improve the accuracy of the execution program.
S103, the signal conversion module carries out version updating processing on the internally written executive program based on the file information and then returns to execute the step S102;
specifically, the processor copies a current execution program written in the memory, and stores a copy of the generated execution program in a historical version library, where the historical version library is stored in the memory; the processor acquires a version information file in the latest execution program, wherein the version information file at least comprises a script file and an update file, and the update file comprises a plurality of operating instructions for converting the TYPE-C signal into an HDMI signal by the processor; the processor deletes the original running file in the current execution program by running the script file, replaces the updated file with the latest running file, and indicates that the execution program written in the memory is the latest execution program; and at the moment, the processor generates a version updating finishing instruction and sends the version updating finishing instruction through the first pin, and after the external source equipment receives the version updating instruction through the first port, an internal screen capturing program is operated.
S104, a network transmission module of the screen transmitter establishes wireless connection with external display equipment based on the transmitted radio waves;
in an embodiment of the present invention, the radio wave includes a preset field and an encoded field, where the preset field at least includes a name of a wireless hotspot of the network transmission module, and the encoded field at least includes a login password of the network transmission module. In a specific implementation process, the external display equipment searches equipment in a connection range and establishes a matching relation with the preset field; decoding the associated encoding field based on a decoding mode provided by a system to acquire a login password of the network transmission module; and finally, establishing a short-distance wireless connection relation with the network transmission module based on the login password.
It should be noted that, after the network transmission module is in communication connection with the external display device, the external display device records communication parameters of the network transmission device, such as wireless access point information, connection password, communication access time point, applicable communication protocol, and the like, so as to facilitate the next direct access of the network transmission module.
S105, the signal conversion module identifies whether a second port on the TYPE-C interface receives the file information;
specifically, the processor in the signal conversion module determines whether the second port receives the file information by identifying whether a second pin connected to the second port has a level change; if the second pin is identified to be maintained at the initial level (low level), which indicates that the second port does not receive the file information, jumping to execute step S102; if the second pin is identified to be at a high level, it is indicated that the second port receives the file information, and at this time, the file information is file information carrying audio/video data, and step S106 is continuously executed.
S106, the signal conversion module carries out HDMI signal conversion coding on the file information according to an execution program written in the signal conversion module, and transmits the generated HDMI audio and video data to a video coding module of the screen transmitter based on an HDMI interface of the screen transmitter;
specifically, the TYPE-C interface can support transmission of 4K × 2K 30Hz audio/video signals through the universal driver of the external source device, so as to meet the requirement of stable and large-space ultra-high-definition video playing, that is, the file information is 4K × 2K 30Hz audio/video signals. At this time, based on the execution program (updated to the latest version) written in the memory, the processor calls the execution program to perform HDMI signal conversion coding on the file information to generate HDMI audio/video data, which can adapt to the transmission requirements of the HDMI interface of the screen transmission device.
And S107, the video coding module compresses the HDMI audio and video data into a network stream audio and video packet, and transmits the network stream audio and video packet to the external display equipment for decoding and displaying based on the network transmission module.
Specifically, the video coding module firstly codes audio data contained in the HDMI audio/video data based on the combination of three modes of waveform coding, parameter coding and hybrid coding to generate audio compressed data, wherein the waveform coding is to perform sampling quantization on a time domain or frequency domain waveform of the audio data, the parameter coding is to perform characteristic parameter extraction on the audio data, and the hybrid coding is to perform high-quality synthesis on output values of the waveform coding and the parameter coding; meanwhile, the video coding module codes video data contained in the HDMI audio/video data based on the combination of three modes of motion estimation and motion compensation, transform coding and entropy coding to generate video compression data, wherein intra-frame redundancy of the video data is eliminated by using transform coding, inter-frame redundancy of the video data is eliminated by using motion estimation and motion compensation, and the compression efficiency of the video data is further improved by using entropy coding; secondly, the video coding module performs format encapsulation on the audio compression data and the video compression data, and then performs packaging processing on the encapsulated audio and video data based on a specified communication protocol to generate a network streaming audio and video packet for network transmission.
In general, the external display device may be a flat panel, a display terminal, or the like, and has the characteristics of a larger screen, a better sound pickup effect, and a higher power of a speaker provided therein, and is provided with a powerful audio/video decoding module inside. In the implementation process of the invention, after the external display device receives the network streaming audio and video packet in a wireless connection mode, an internal audio and video decoding module is used for decoding the network streaming audio and video packet, and the decoding process comprises the steps of sequentially carrying out protocol decoding, decapsulation, audio decoding and video decoding on the network streaming audio and video packet; carrying out format detection on the decoded audio data and video data, and judging whether the audio data and the video data are in a video file format capable of supporting playing; if not, preferentially performing format conversion on the decoded audio data and video data; and if so, carrying out sound modification and synchronization processing on the decoded audio data and video data, and outputting the processed audio data and video data to a display screen of the external display equipment for real-time playing.
Based on the method of the embodiment of the invention, the execution program stored by the signal conversion module is firstly inquired and updated in an auxiliary way through the external source equipment, so that the signal conversion module has high efficiency and accuracy in the process of completing the conversion of the TYPE-C signal carrying audio and video data; and based on the digital content protection function of the HDMI interface, the optimal screen sensing effect can be guaranteed by matching with the video coding module, so that the user experience is met. According to the wireless screen transmitter, the video coding module is mainly provided with the HDMI special chip, the TYPE-C interface is used as a main screen transmitting interface and the HDMI interface is used as an auxiliary screen transmitting interface in the actual use process, so that external source equipment with the TYPE-C interface can transmit interface data in real time; on the other hand, the HDMI can be used as an independent screen transmission interface, so that the external source equipment with the HDMI can also complete screen transmission, and the practicability is good.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: read Only Memory (ROM), Random Access Memory (RAM), magnetic or optical disks, and the like.
The foregoing describes in detail an HDMI signal screen transmission method and a wireless screen transmitter based on a TYPE-C interface according to an embodiment of the present invention, and a specific example is used herein to explain the principle and the implementation manner of the present invention, and the description of the foregoing embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (9)
1. A HDMI signal screen transmission method based on TYPE-C interface is characterized by comprising the following steps:
when a TYPE-C interface of a screen transmitter receives file information transmitted by external source equipment, a signal conversion module of the screen transmitter identifies whether a first port on the TYPE-C interface receives the file information;
if the first port is identified not to receive the file information, the signal conversion module identifies whether a second port on the TYPE-C interface receives the file information;
if the second port is identified to receive the file information, the signal conversion module carries out HDMI signal conversion coding on the file information according to an execution program written in the signal conversion module, and transmits generated HDMI audio and video data to a video coding module of the screen transmission device based on an HDMI interface of the screen transmission device;
the video coding module compresses the HDMI audio and video data into a network stream audio and video packet, and transmits the network stream audio and video packet to an external display device for decoding and displaying based on a network transmission module of the screen transmitter;
the video coding module firstly codes audio data contained in the HDMI audio/video data based on the combination of three modes of waveform coding, parameter coding and mixed coding to generate audio compression data, wherein the waveform coding is used for sampling and quantizing time domain or frequency domain waveforms of the audio data, the parameter coding is used for extracting characteristic parameters of the audio data, and the mixed coding is used for performing high-quality synthesis on output values of the waveform coding and the parameter coding; meanwhile, the video coding module codes video data contained in the HDMI audio/video data based on the combination of three modes of motion estimation and motion compensation, transform coding and entropy coding to generate video compression data, wherein intra-frame redundancy of the video data is eliminated by using transform coding, inter-frame redundancy of the video data is eliminated by using motion estimation and motion compensation, and the compression efficiency of the video data is further improved by using entropy coding; secondly, the video coding module performs format encapsulation on the audio compression data and the video compression data, and then performs packaging processing on the encapsulated audio and video data based on a specified communication protocol to generate a network streaming audio and video packet for network transmission;
after the signal conversion module of the screen transmission device identifies whether the first port on the TYPE-C interface receives the file information, the method further comprises the following steps:
and if the first port is identified to receive the file information, the processor of the signal conversion module carries out version updating processing on an executive program in the memory of the signal conversion module based on the file information, and then returns to re-identify whether the first port on the TYPE-C interface receives new file information.
2. The HDMI signal screen transmission method based on TYPE-C interface of claim 1, wherein said signal conversion module performing HDMI signal conversion coding on said file information according to an internally written execution program comprises:
the written executive program is stored in the memory of the signal conversion module, and the processor of the signal conversion module calls the executive program and carries out HDMI signal conversion coding on the file information based on the executive program.
3. The HDMI signal screen transmission method based on TYPE-C interface of claim 2, wherein the first port is used for providing a channel for the external source device to transmit the program update file to the processor, and the second port is used for providing a channel for the external source device to transmit the audio and video data to the processor.
4. The HDMI signal screen transmission method based on TYPE-C interface of claim 2, wherein before the TYPE-C interface of the screen transmitter receives the file information transmitted by the external source device, the method further comprises:
and the external source equipment reads the executive program written in the memory based on a third port on the TYPE-C interface and generates the file information based on the version verification result of the executive program, wherein the third port is used for providing a channel for the external source equipment to access the memory.
5. The HDMI signal screen transmission method based on TYPE-C interface of claim 1, wherein before said signal conversion module identifies whether said second port on said TYPE-C interface receives said file information, further comprising:
the network transmission module establishes a wireless connection with the external display device based on the transmitted radio waves, which include a preset field and an encoding field.
6. The HDMI signal screen transmission method according to claim 5, wherein the preset field at least includes a wireless hotspot name of the network transmission module, and the encoding field at least includes a login password of the network transmission module.
7. A wireless screen transmitter is characterized by comprising a TYPE-C interface, an HDMI interface, a signal conversion module, a video coding module and a network transmission module, wherein the signal conversion module is connected with external source equipment through the TYPE-C interface; wherein the content of the first and second substances,
the TYPE-C interface is used for receiving file information transmitted by the external source equipment;
the signal conversion module is used for identifying whether a first port and a second port on the TYPE-C interface receive the file information or not; based on the fact that the first port does not receive the file information and the second port receives the file information, carrying out HDMI signal conversion coding on the file information according to an execution program written in the first port and generating HDMI audio and video data;
the HDMI is used for transmitting the HDMI audio and video data to the video coding module;
the video coding module is used for compressing the HDMI audio and video data into a network stream audio and video packet and transmitting the network stream audio and video packet to the network transmission module;
the network transmission module is used for transmitting the network stream audio and video packet to the external display equipment for decoding and displaying;
the video coding module firstly codes audio data contained in the HDMI audio/video data based on the combination of three modes of waveform coding, parameter coding and mixed coding to generate audio compression data, wherein the waveform coding is used for sampling and quantizing time domain or frequency domain waveforms of the audio data, the parameter coding is used for extracting characteristic parameters of the audio data, and the mixed coding is used for performing high-quality synthesis on output values of the waveform coding and the parameter coding; meanwhile, the video coding module codes video data contained in the HDMI audio/video data based on the combination of three modes of motion estimation and motion compensation, transform coding and entropy coding to generate video compression data, wherein intra-frame redundancy of the video data is eliminated by using transform coding, inter-frame redundancy of the video data is eliminated by using motion estimation and motion compensation, and the compression efficiency of the video data is further improved by using entropy coding; secondly, the video coding module performs format encapsulation on the audio compression data and the video compression data, and then performs packaging processing on the encapsulated audio and video data based on a specified communication protocol to generate a network streaming audio and video packet for network transmission;
after the signal conversion module of the screen transmission device identifies whether the first port on the TYPE-C interface receives the file information, the method further comprises the following steps:
and if the first port is identified to receive the file information, the processor of the signal conversion module carries out version updating processing on an executive program in the memory of the signal conversion module based on the file information, and then returns to re-identify whether the first port on the TYPE-C interface receives new file information.
8. The wireless screen transmitter according to claim 7, wherein the signal conversion module comprises a processor and a memory, and the processor is connected with the memory based on a signal line;
the memory is used for storing an executive program, and the executive program at least comprises a plurality of operating instructions for converting the TYPE-C signal into an HDMI signal by the processor;
the processor is used for calling the execution program and carrying out HDMI signal conversion coding on the file information based on the execution program.
9. The wireless screen reader according to claim 8, wherein the first port is configured to provide a channel for the external source device to transmit a program update file to the processor, and the second port is configured to provide a channel for the external source device to transmit audio/video data to the processor.
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