CN106412684A - High-definition video wireless transmission method and system - Google Patents
High-definition video wireless transmission method and system Download PDFInfo
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- CN106412684A CN106412684A CN201610821548.1A CN201610821548A CN106412684A CN 106412684 A CN106412684 A CN 106412684A CN 201610821548 A CN201610821548 A CN 201610821548A CN 106412684 A CN106412684 A CN 106412684A
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- wireless transmission
- hdmi
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000007906 compression Methods 0.000 claims description 17
- 230000006835 compression Effects 0.000 claims description 15
- 238000004891 communication Methods 0.000 claims description 10
- 230000000873 masking effect Effects 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 7
- 230000007704 transition Effects 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 3
- 238000011161 development Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- GJWAPAVRQYYSTK-UHFFFAOYSA-N [(dimethyl-$l^{3}-silanyl)amino]-dimethylsilicon Chemical compound C[Si](C)N[Si](C)C GJWAPAVRQYYSTK-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
Classifications
-
- 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
- H04N21/43637—Adapting the video stream to a specific local network, e.g. a Bluetooth® network involving a wireless protocol, e.g. Bluetooth, RF or wireless LAN [IEEE 802.11]
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The invention provides a high-definition video wireless transmission method and system. According to the method provided by the invention, as an HDMI receiver is adopted, a video source of high-definition video transmission is realized to be an HDMI video stream; and a video real-time encoding-decoding manner is adopted, so the transmission bandwidth is reduced to a great extent, and the wireless transmission of a high-definition video with a large big volume is realized.
Description
Technical field
The present invention relates to video data transmission field, more particularly, to a kind of HD video radio transmitting method and be
System.
Background technology
With the development of intelligent domestic system, smart meeting room, intelligent tutoring system etc., the nothing in the LAN of audio frequency and video
Line transmission technology plays the key player of these intelligence systems all the time, becomes the popular subject under discussion to its research and development for the people.
It is wirelessly transferred relative maturity in China, the LAN of audio frequency, and present various solutions.Wherein
The form of hardware presents various：Such as impart knowledge to students special point-to-point wireless microphone, the gateway of the smart home based on Wi-Fi is made
For the form that ANTENNAUDIO server etc. is common.The medium selection of other audio transmission also has various：Wi-Fi, bluetooth, 2.4G,
Even ZigBee.
With ANTENNAUDIO Comparatively speaking, the development of wireless video is relatively slow, and its reason is also evident from：Wireless video
Development difficulty and development cost are all relatively larger.Even so, the demand of wireless video still becomes the focus in market.Than
As special photographic head wireless supervisory control system in security protection, shoots special unmanned plane and shoots wireless transmitting system, teaching or meeting are special
Wireless video projection application, advertisement machine large-size screen monitors be wirelessly transferred application, the radio multimedium center in smart home, high-end
In medical apparatus and instruments, high radiation high definition imaging is wirelessly transferred application etc..
Most wireless video transmission system at present, the mainly wireless supervisory control system of photographic head, its video source is exactly
Photographic head, this can not meet video being wirelessly transferred to video purely.Because the wireless supervisory control system of photographic head is relative
Speech, it eliminates collection and the process part of video, the substitute is collection and the coded treatment of photographic head itself, so taking the photograph
As the development difficulty of head wireless supervisory control system is less, also generally existing on market.And video being wirelessly transferred to video purely,
Domestic contrast is rare it is seen that development difficulty is larger.For solving this problem, of the present invention " realize the wireless biography of HD video
Defeated method ", generally refers to design a kind of video source purely to the wireless transmitting system of video output terminals.
From the point of view of existing technology, traditional transmission of video can not reach " wireless " standard mutually unified with " high definition " simultaneously,
Do not enable HD video to be transmitted by wireless modes such as Wi-Fi, or wireless video transmission can not reach 720p and
Above high definition standard.In addition, HD video transmission is commonly present time delay, interim card, the transmission low problem of image quality.
Content of the invention
The present invention provides a kind of HD video radio transmitting method, this approach reduces transmission bandwidth it is achieved that big data
Being wirelessly transferred of HD video of amount.
A further object of the present invention is to provide a kind of high-definition video wireless transmission system.
In order to reach above-mentioned technique effect, technical scheme is as follows：
A kind of HD video radio transmitting method, comprises the following steps：
S1：HD video is gathered using HDMI receiver；
S2：Real-time coding compression is carried out to the video flowing of HDMI receiver collection；
S3：By the compressed package obtaining in S2 by way of being wirelessly transferred, outwards broadcasted in the form of server；
S4：Receiving device carries out real-time decoding to the compressed package receiving, and is sent in corresponding HDMI playback equipment.
A kind of high-definition video wireless transmission system, including transmitting terminal and receiving terminal, transmitting terminal and receiving terminal are using wireless
Communication mode；Described transmitting terminal includes the sequentially HDMI receiver of wired connection and coding module.
Further, described HDMI receiver includes transition modulation differential signal unit, the front-end processing list being sequentially connected with
Unit, masking unit, color space converter；Transition modulation differential signal unit is used for gathering HD video, color space conversion
Device is connected to coding module module；DHCP decryption engine module is connected with masking unit, DynamicHost is joined
Put and DHCP key module is connected with agreement decryption engine.
Further, the transition in described HDMI receiver modulates the data flow of differential signal unit through front-end processing list
It is reduced into 24bit signal stream after unit and enters masking unit, masking unit is by carrying out DHCP decryption engine mould
Block is then demultiplex out being processed in video flowing entrance color space converter.
Further, the video flowing that described coding module transmits to HDMI receiver carries out video Real Time Compression, video pressure
Contracting, by way of reducing and removing redundant video data, reaches the mesh of effective transmission and storage digital video file, in compression
During, video flowing is compressed with the interim compressed package after creating compression, to be transmitted and to store.
Further, include decoder in described receiving terminal the compressed package that coding module sends over is solved in real time
Code, the fine definition of reduction video, it is converted into playable non-compression video stream format.
Preferably, the communication of described transmitting terminal and receiving terminal is WiFi communication.
Preferably, the connected mode of HDMI receiver and coding module is ITU-R.BT656.
Preferably, described HDMI receiver also includes I2C module and read-write register, and I2C module is used for and outside
The communication of EDIDROM, read-write register is used for producing the control command to HDMI receiver.
Compared with prior art, the beneficial effect of technical solution of the present invention is：
The present invention is HDMI video stream using the video source that HDMI receiver achieves HD video transmission, real using video
When encoding and decoding mode greatly reduce transmission bandwidth it is achieved that being wirelessly transferred of the HD video of big data quantity.
Brief description
Fig. 1 is present system structure chart；
Fig. 2 is the HDMI receiver fundamental diagram in present system.
Specific embodiment
Being for illustration only property of accompanying drawing illustrates it is impossible to be interpreted as the restriction to this patent；
In order to the present embodiment is more preferably described, some parts of accompanying drawing have omission, zoom in or out, and do not represent actual product
Size；
To those skilled in the art, in accompanying drawing, some known features and its explanation may omission be to be appreciated that
's.
With reference to the accompanying drawings and examples technical scheme is described further.
HD video wireless transmission principles are as follows：
It is HDMI receiver collection first, process, change HDMI HD video data, by incoming HDMI video circulationization
For the video flowing of the accessible form of encoder, by standard output.Video after the HDMI receiver of output is processed is streamed to
In coding side processor module, it is translated into the video data of the compressed formats such as the H264 after coding (compression), data is passed through
Compression could make Wi-Fi transmission be achieved.By wireless transmission methods such as Wi-Fi, signal is passed at receiving terminal in real time
Reason device is decoded processing.Decoder by decoding video stream for common format video flowing, finally by obtaining the slow of LCD device
Deposit the video stream data of area framebuff, it is exported with HDMI Streaming Media form.
System principle that HD video is wirelessly transferred and realize structure and be described as follows, wherein overall realizes structure chart such as Fig. 1
Shown：
1) HDMI receiver
It is illustrated in figure 2 HDMI receiver schematic diagram, TMDS data flow is reduced into after front end receiver decoder module
24bit signal stream enters processing data packets module, carries out HDCP descrambling by HDCP authentication mechanism module and is then demultiplex out video
Stream.Video flowing enters in color space conversion and uplink/downlink sampling module and is processed, and interrupt control unit regards being successfully transmitted
Frequency produces interrupt notification main control chip, video data bag successfully decoded according to the value of rear setting depositor.Mainly use from I2C module
In the communication with outside EDIDROM, main I2C module is used for and Master control chip communication, by the value of read-write register module Lai
Produce the control command to HDMI receiver.
2) video compress (Video coding)
In order to realize being wirelessly transferred of HD video of big data quantity, the video flowing that HDMI receiver is transmitted carries out video
Real Time Compression, video compress, by way of reducing and removing redundant video data, reaches effective transmission and storage digital video
The purpose of file.In compression process, applied compression algorithm is compressed the temporary file after creating compression to video flowing, so that
It is transmitted and store.
3) it is wirelessly transferred
The temporary file that above-mentioned compression creates passes through packing, by the transmission of the wireless modes such as Wi-Fi, with the shape of server
Formula is outwards broadcasted.The client (it can also be multiple for being one) of decoding obtains IP and the port of the same network segment, to transmission
And the packet coming carries out the parsing of next step.
4) video decoding
Decoder carries out real-time decoding to the video data bag of the compressed format such as H.264 sending, by using corresponding
Decompression algorithm, reduction video fine definition, be converted into playable non-compression video stream format.
5) exported with HDMI stream broadcasting
When playing video flowing, if system default output form is LCD device, need to obtain the frame buffer of LCD device
The data of framebuff, by the HDMI equipment of conversion output to response.
In order to present disclosure is fully described, described below is embodiments of the invention, not in order to limit this
Bright, all modifications made within the spirit and principles in the present invention, equivalent, improvement etc., should be included in the guarantor of the present invention
Within the scope of shield.
Using the SiI9135 module of Silicon Image company as a example receptor.HDMI-1.3 version supported by this receptor
This, in this, as the input of signal source；Support to be up to 1080p/60Hz, 36 bits of 720p/120Hz＆1080i/120Hz
Color depth.
Using Samsung S5PV210 as the primary processor of transmitting and receiving terminal as a example, this processing module and above-mentioned HDMI
Receiver module has common interface：ITU-R.BT656 international standard interface.And the YCbCr 4 with 8 bits:2:2 as interface
The form of transmission.
H.264, coded system can wait Software Coding mode with adopt, if common processor can not be carried out in real time
Coded treatment so that the process of whole transmission of video produces the excessive phenomenon of time delay, can be with using hardware encoding mode, with three
The MFC hardware encoding example that star S5PV210 carries, realizes the high efficient coding of the video of big data quantity.MFC(Multi Format
Codec) multi-format codec, is a kind of internal hardware circuit supporting multiple hardwares coded system of ARM microprocessor, video
Coding supports that MPEG-4/H.263/H.264 reaches 1080p@30fps, and decoding MPEG2/VC1/Xvid video reaches 1080p@
The multimedia image of the multiple formats such as 30fps.
Using 5GHz frequency range Wi-Fi Direc as wireless transmission method as a example, it is a kind of point-to-point connection technology,
Therefore it is also referred to as Wi-Fi P2P (point-to-point).Linux system is adopted on S5PV210, only need to configure Wi-Fi's
Associated documents and the related service starting Wi-Fi Direct, just can realize the Wi-Fi between transmitting terminal and receiving terminal
Direct connects.
Using FFmpeg as decoding storehouse, FFplay as player as a example, the video flowing sending is decoded, broadcasts
Put, and with the output of HDMI HD video form.
Decoding end is decoded using FFmpeg storehouse, with FFplay come the Media Stream after broadcast decoder.Video data stream letter
Single process, the broad sense input file being represented by ByteIOContext, the specific file container stream information providing in AVStream
Under guide, read complete frame data with the read_packet () function of AVInputFormat interface, be put into audio frequency respectively
Or in video PacketQueue queue, this partial function is completed by decode_thread thread.For video data, video_
Thread thread ceaselessly takes out frame of video from video PacketQueue queue, calls the decode () of AVCodec interface
Function decodes frame of video, does color space conversion and call SDL storehouse to show after suitable time-delay.
Would state again, above-described embodiment is only intended to clearly illustrate example, and the not limit to embodiment
Fixed.For those of ordinary skill in the field, on the basis of the above description can also be of different sizes according to equipment
Make other changes in different forms.There is no need to be exhaustive to all of embodiment.And thus institute
The obvious change extended out or change among still in the protection domain of the invention.
Same or analogous label corresponds to same or analogous part；
Described in accompanying drawing, position relationship illustrates it is impossible to be interpreted as the restriction to this patent for being for illustration only property；
Obviously, the above embodiment of the present invention is only intended to clearly illustrate example of the present invention, and is not right
The restriction of embodiments of the present invention.For those of ordinary skill in the field, also may be used on the basis of the above description
To make other changes in different forms.There is no need to be exhaustive to all of embodiment.All this
Any modification, equivalent and improvement made within the spirit of invention and principle etc., should be included in the claims in the present invention
Protection domain within.
Claims (9)
1. a kind of HD video radio transmitting method is it is characterised in that comprise the following steps：
S1：HD video is gathered using HDMI receiver；
S2：Real-time coding compression is carried out to the video flowing of HDMI receiver collection；
S3：By the compressed package obtaining in S2 by way of being wirelessly transferred, outwards broadcasted in the form of server；
S4：Receiving device carries out real-time decoding to the compressed package receiving, and is sent in corresponding HDMI playback equipment.
2. a kind of system of the HD video radio transmitting method described in application claim 1 is it is characterised in that include transmitting terminal
And receiving terminal, transmitting terminal and receiving terminal adopt wireless communication mode；The HDMI that described transmitting terminal includes sequentially wired connection connects
Receive device and coding module.
3. high-definition video wireless transmission system according to claim 2 it is characterised in that described HDMI receiver include suitable
The transition modulation differential signal unit of secondary connection, front-end processing unit, masking unit, color space converter；Transition modulation is poor
Sub-signal unit is used for gathering HD video, and color space converter is connected to coding module module；It is connected with masking unit
DHCP decryption engine module, DHCP decryption engine is connected with DHCP
Key module.
4. high-definition video wireless transmission system according to claim 3 is it is characterised in that mistake in described HDMI receiver
The data flow crossing modulation differential signal unit is reduced into 24bit signal stream entrance masking unit after front-end processing unit, covers
Code unit is then demultiplex out video flowing entrance color space converter by carrying out DHCP decryption engine module
In processed.
5. high-definition video wireless transmission system according to claim 3 is it is characterised in that described coding module connects to HDMI
The video flowing that receipts device transmits carries out video Real Time Compression, and video compress, by way of reducing and removing redundant video data, reaches
To effective mesh sending and storing digital video file, in compression process, facing after video flowing being compressed create compression
When compressed package to be transmitted and to store.
6. high-definition video wireless transmission system according to claim 2 is it is characterised in that include decoding in described receiving terminal
The compressed package that device sends over to coding module carries out real-time decoding, the fine definition of reduction video, is converted into playable non-
Compressed video data form.
7. high-definition video wireless transmission system according to claim 2 is it is characterised in that described transmitting terminal and receiving terminal
Communication is WiFi communication.
8. high-definition video wireless transmission system according to claim 2 is it is characterised in that HDMI receiver and coding module
Connected mode be ITU-R.BT656.
9. high-definition video wireless transmission system according to claim 3 is it is characterised in that described HDMI receiver also includes
I2C module and read-write register, for the communication with outside EDIDROM, read-write register is right for producing for I2C module
The control command of HDMI receiver.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610821548.1A CN106412684A (en) | 2016-09-13 | 2016-09-13 | High-definition video wireless transmission method and system |
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| CN201610821548.1A CN106412684A (en) | 2016-09-13 | 2016-09-13 | High-definition video wireless transmission method and system |
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| CN201610821548.1A Pending CN106412684A (en) | 2016-09-13 | 2016-09-13 | High-definition video wireless transmission method and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106878803A (en) * | 2017-02-17 | 2017-06-20 | 利亚德光电股份有限公司 | It is wirelessly transferred method, device and the system of video/audio |
| CN109558105A (en) * | 2018-12-14 | 2019-04-02 | 广州视源电子科技股份有限公司 | Screen projection method, screen projection device and screen projection equipment |
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Application publication date: 20170215 |