CN101860738A - Ethernet-based transmitting and receiving method of uncompressed video - Google Patents
Ethernet-based transmitting and receiving method of uncompressed video Download PDFInfo
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- CN101860738A CN101860738A CN 201010142390 CN201010142390A CN101860738A CN 101860738 A CN101860738 A CN 101860738A CN 201010142390 CN201010142390 CN 201010142390 CN 201010142390 A CN201010142390 A CN 201010142390A CN 101860738 A CN101860738 A CN 101860738A
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Abstract
The invention relates to an Ethernet-based transmitting method of uncompressed video. The method comprises the following steps: generating an information identification according to the extracted time reference number, extracting effective pixels from a video to be transmitted; storing the information identification and one row or multiple continuous rows of effective pixels in a memory at the transmitting end; reading the information identification and the row or multiple continuous rows of effective pixels from the memory on the transmitting end, using the information identification and each row of effective pixels as one load of an Ethernet pack according to the Ethernet protocol to package to the Ethernet frame format; and transmitting the Ethernet packs according to the row sequence of the effective pixels. In addition, the invention also provides an Ethernet-based receiving method of uncompressed video. The methods of the invention can adopt uncompressed mode to transmit the video image, thus avoiding the distortion of video in compression and ensuring the transmitting quality, receiving quality and recovering quality of video. Moreover, the transmission protocol adopts the standard Ethernet protocol, thus a public Ethernet network can be used and the system of the invention can be used along with the Ethernet devices, such as the switch, of other manufacturers for networking.
Description
[technical field]
The present invention relates to a kind of video transmission method and method of reseptance, particularly a kind of transmission method and method of reseptance of the non-compression video based on Ethernet.
[background technology]
At present, (time division multiplexing is adopted in the transmission of non-compression video, and (Time Division Multiplexer TDM) realizes with parallel/serial switch technology for Pulse Code Modulation, vision signal PCM) at pulse code modulation.This privately owned host-host protocol can only transmit in the network of special use, and the equipment transmission protocol of the equipment of different manufacturers, same producer different model has nothing in common with each other, can not intercommunication, use inconvenience.And existing ITU-R BT.656 video all adopts the mode of compressed encoding to transmit, compressed encoding can bring in various degree loss to video information, when Compress softwares, need store multiple image, the data time-delay is very big, in the occasion that video quality is had relatively high expectations, this video distortion and time-delay are unallowed.
[summary of the invention]
In view of this, for overcoming the deficiencies in the prior art, the invention provides a kind of transmission method of the non-compression video based on Ethernet.
In addition, the present invention also provides a kind of method of reseptance of the non-compression video based on Ethernet.
A kind of non-compression video transmission method based on Ethernet may further comprise the steps: produce message identification according to the timing base sign indicating number that is extracted, and extract valid pixel from video waiting for transmission; Message identification and delegation or continuous rows of effective pixels are deposited in the memory of transmitting terminal; Sense information sign and delegation or continuous rows of effective pixels from the memory of transmitting terminal according to the load of Ethernet protocol as an Ethernet bag, are packaged into ethernet frame format; And send the Ethernet bag in proper order according to the capable preface of valid pixel.
Preferably, described message identification is used to refer to capable preface and the frame preface of valid pixel in data flow in this ethernet frame.
Preferably, described message identification comprises 2 bytes, the capable preface of the 0th～9 bit representation valid pixel wherein, the type of the 10th bit representation transmission data, the frame preface of the 11st bit representation valid pixel.
Preferably, described timing base sign indicating number is meant " the FF 00 00SAV " sequence in the data flow of ITU-R BT.656 form.
Preferably, describedly produce message identification and from video waiting for transmission, extract valid pixel according to the timing base sign indicating number that extracted, be meant variation, 720 valid pixels during the capable preface of generation ITU-R BT.656 data flow and frame preface and extracted valid data are capable after the SAV according to SAV.
A kind of non-compression video method of reseptance based on Ethernet may further comprise the steps: receive the Ethernet bag that is packaged into message identification and delegation or continuous rows of effective pixels; According to frame structure, from the Ethernet bag that receives, take out message identification and valid pixel; And the relevant position that valid pixel is write successively the memory of receiving terminal according to message identification.
Preferably, described message identification produces according to the timing base sign indicating number of the video that is received, and described message identification comprises frame preface and row preface.
Preferably, described receiving terminal comprises first memory and second memory, and described first memory and second memory are respectively applied for the valid pixel of two continuous frames that storage extracted from the Ethernet bag.
Preferably, when one of them reads the delegation of a certain frame or continuously during rows of effective pixels from first memory or second memory, ensuing delegation or rows of effective pixels continue to read one of them from described first memory or second memory in the same frame.
Preferably, when read one of them from first memory or second memory a frame valid pixel and need another memory from first memory or second memory in when reading the next frame valid pixel, if current described another memory is written into, then repeat to read described first memory or the second memory frame valid pixel in one of them.
The present invention can be transmitted and the receiver, video image in incompressible mode, and the distortion of avoiding video to occur in compression guarantees the transmission of video and receives the quality of reducing.And host-host protocol adopts the Ethernet protocol of standard, can use public ethernet network, can use with the ethernet device networking of other producers, as switch etc.
[description of drawings]
Fig. 1 is the line data form of ITU-R BT.656.
Fig. 2 is the vertical sequential of ITU-R BT.656.
Fig. 3 is the particular content schematic diagram of 2 byte information sign.
Fig. 4 is message identification and the position view of valid pixel in the memory of transmitting terminal.
Fig. 5 is the ethernet frame format schematic diagram.
Fig. 6 is the position view of valid pixel in the memory of receiving terminal.
Fig. 7 is for adopting the system schematic of transmission method of the present invention and method of reseptance.
[embodiment]
For understanding the present invention better, inventive embodiment is described in detail below with reference to accompanying drawing.
Be ITU-R BT.656 frame format schematic diagram shown in Fig. 1 and Fig. 2, except the YCbCr effective video signal that comprises 4:2:2, also comprise digital blanking signal and timing reference signal.One frame image data is made up of the data block of one 625 row, every row 1728 bytes.Wherein, 23～311 row are even field video datas, and 336～624 row are odd field video datas, and all the other are control signal.
Be that example illustrates embodiment with the PAL-D standard below.One frame ITU-R BT.656 is divided into two, every has 288 row valid data capable, every row has the i.e. 1440 byte effective video data of 720 valid pixels, and ITU-R BT.656 interface also comprises vertical blanking, horizontal blanking and timing base sign indicating number except the valid pixel of the YCbCr of transmission 4:2:2.
At first, from ITU-R BT.656 data flow, detect timing base sign indicating number " FF 00 00 SAV ".Produce the message identification of 2 bytes according to the timing base sign indicating number, the content of message identification as shown in Figure 3.When SAV becomes 0X80 by 0XAB, first capable beginning of valid data, Frame is changed to 0, and Line is changed to 23, extracts 720 valid pixels of SAV back, abandons horizontal blanking; When detecting SAV once more and be 0X80, Line adds 1, extracts 720 valid pixels of SAV back, abandons horizontal blanking.When SAV becomes 0XC7 by 0XEC, second capable beginning of valid data, Line is changed to 336, extracts 720 valid pixels of SAV back, abandons horizontal blanking; When detecting SAV once more and be 0XC7, Line adds 1, extracts 720 valid pixels of SAV back, abandons horizontal blanking.When SAV was 0XEC, 0XAB, this line data was vertical blanking, and Line remains unchanged, and abandons vertical blanking.When SAV becomes 0XAB by 0XEC, the value negate of Frame.
Above-mentioned Line and Frame are row and the frame preface of valid pixel in ITU-R BT.656 form that is used to refer in the 2 byte information sign in this Ethernet bag.As shown in Figure 3, Line is used for representing the capable preface of valid pixel, represents with bit0～bit9, and scope is 23～310,336～623; Bit10 is used for representing type, with ' 0 ' expression transmission of video; Frame is used for representing the frame preface of valid pixel, with ' 0 ' the 2 frame valid pixels adjacent with ' 1 ' cyclic representation; Bit12～bit14 keeps; Bit15 is a check digit, and message identification is carried out odd.
After from ITU-R BT.656 data flow, extracting valid pixel, the message identification of 2 bytes and 720 valid pixels are deposited in the memory of transmitting terminal, as shown in Figure 4, after being filled with delegation's valid pixel, sense information sign and valid pixel from the memory of transmitting terminal are according to Ethernet protocol, as the load of an Ethernet bag, as shown in Figure 5, be packaged into two layers of ethernet frame format.Capable preface according to valid pixel sends the Ethernet bag in proper order.
As shown in Figure 7, after receiving terminal is received the Ethernet bag,, take out message identification and valid pixel according to the frame structure shown in Fig. 4.Then, judge that the bit10 in the message identification is ' 0 ', promptly video type extracts Frame and Line in the message identification again.Receiving terminal uses 2 memories, i.e. memory A and memory B, respectively buffer memory Frame be ' 0 ' with the valid pixel of ' 1 ' two frame ITU-R BT.656.According to the Frame in the message identification and the Line relevant position of write memory successively.Shown in Fig. 6 the distribution schematic diagram of valid pixel in memory (memory A or memory B).In the time need from memory (memory A or memory B), reading the valid pixel of the 23rd row, if the positive write memory A of valid pixel that extract this moment from the Ethernet bag, then from memory B, read valid pixel output, the valid pixel of ensuing the 24th～310 row, the 336th～623 row is still read from memory B, has so just read the valid pixel of a complete frame ITU-R BT.656 from memory; When need from memory, read next frame the 23rd the row valid pixel the time, the positive write memory B of the valid pixel that from the Ethernet bag, extracts, then from memory A, read valid pixel output, the valid pixel of ensuing the 14th～310 row, the 336th～623 row is still read from memory A, so just from memory, read the valid pixel of complete next frame ITU-R BT.656 again, so circulation.If after from memory A, reading the valid pixel of a complete frame ITU-R BT.656, when need from memory A or B, read next frame the 23rd the row valid pixel the time, the still positive write memory B of the valid pixel that extracts from the Ethernet bag repeats to read the frame valid pixel among the A this moment.
In order to save bandwidth, only in network, transmit valid pixel, during receiving unit reduction ITU-R BT.656 form, insert horizontal blanking, vertical blanking and timing base sign indicating number again.
Because the performance of network, the Ethernet bag may occur out of order and time-delay in transmission course.If it is out of order, capable preface in the message identification no longer is an order, equally according to the row preface video data is deposited in the relevant position of memory, the cache way that deposits in, calls over by non-order and the repeating mechanism of reading the previous frame valid pixel can be eliminated influence out of order and that network delay brings like this.
For the transmission of non-compression video, do not need to carry out compressed video, so the time-delay of non-compression video is very little by frame before and after storage multi-frame video, the comparison.Transmitting terminal sends after extracting delegation's valid pixel immediately among the present invention, and the time-delay of data is the time of the ITU-R BT.656 of delegation data flow; Receiving unit is stored two frame data, and the time-delay of data i.e. the time of a frame ITU-R BT.656 data flow.One frame ITU-R BT.656 is divided into 625 row, and per second is play 25 frames, and the data time-delay is (1/25/625+1/25) second among the present invention, about 40ms, and the data of compressed video time-delay at present is at least on 200ms.
During reduction ITU-R BT.656, according to the form of ITU-R BT.656, as shown in Figure 2, the vertical blanking of output 1～22 row earlier; When 23～310 row,, behind output SAV, from memory, read the capable valid pixel output of corresponding valid data according to line data form output horizontal blanking, timing base sign indicating number; Export the vertical blanking of 311～312 row, the vertical blanking of 313～315 row again; When 316～623 row,, behind output SAV, from memory, read the capable valid pixel output of corresponding valid data equally according to line data form output horizontal blanking, timing base sign indicating number; Export the vertical blanking of 624～625 row at last.So just reduced the ITU-RBT.656 data flow of radiating portion.
Above-mentioned transmission and method of reseptance are suitable equally under the TSC-system formula.
Transmission method of the present invention also goes for the transmission of huge packet (Jumbo Frame).In the gigabit Ethernet transmission, adopt Junbo Frame can improve the efficiency of transmission of video data greatly.For example, can be packaged into ethernet frame to the 4 continuous row video datas and the message identification of 2 bytes together, wherein field in the message identification and row preface are represented field, the row information of initial row in ITU-R BT.656 form in this 4 row video data.Receiving unit is stored 4 row video datas according to field in the message identification and row preface continuously as original position.Similarly, in other optional embodiment, also can the maximum 6 continuous message identifications of going video datas and 2 bytes be packaged into ethernet frame together and send according to actual conditions.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (10)
1. non-compression video transmission method based on Ethernet may further comprise the steps:
Produce message identification according to the timing base sign indicating number that is extracted, and from video waiting for transmission, extract valid pixel; Message identification and delegation or continuous rows of effective pixels are deposited in the memory of transmitting terminal;
Sense information sign and delegation or continuous rows of effective pixels from the memory of transmitting terminal according to the load of Ethernet protocol as an Ethernet bag, are packaged into ethernet frame format; And
Capable preface according to valid pixel sends the Ethernet bag in proper order.
2. the non-compression video transmission method based on Ethernet according to claim 1 is characterized in that: described message identification is used to refer to capable preface and the frame preface of valid pixel in data flow in this ethernet frame.
3. the non-compression video transmission method based on Ethernet according to claim 2, it is characterized in that: described message identification comprises 2 bytes, the capable preface of the 0th～9 bit representation valid pixel wherein, the type of the 10th bit representation transmission data, the frame preface of the 11st bit representation valid pixel.
4. the non-compression video transmission method based on Ethernet according to claim 1 is characterized in that: described timing base sign indicating number is meant " the FF 00 00 SAV " sequence in the data flow of ITU-R BT.656 form.
5. the non-compression video transmission method based on Ethernet according to claim 3, it is characterized in that: describedly produce message identification and from video waiting for transmission, extract valid pixel according to the timing base sign indicating number that extracted, be meant variation, 720 valid pixels during the capable preface of generation ITU-R BT.656 data flow and frame preface and extracted valid data are capable after the SAV according to SAV.
6. method of reseptance based on the non-compression video of Ethernet may further comprise the steps:
The Ethernet bag that reception is packaged into message identification and delegation or continuous rows of effective pixels;
According to frame structure, from the Ethernet bag that receives, take out message identification and valid pixel; And
Valid pixel is write successively the relevant position of the memory of receiving terminal according to message identification.
7. the method for reseptance of the non-compression video based on Ethernet according to claim 6 is characterized in that: described message identification produces according to the timing base sign indicating number of the video that is received, and described message identification comprises frame preface and row preface.
8. the method for reseptance of the non-compression video based on Ethernet according to claim 7, it is characterized in that: described receiving terminal comprises first memory and second memory, and described first memory and second memory are respectively applied for the valid pixel of two continuous frames that storage extracted from the Ethernet bag.
9. the method for reseptance of the non-compression video based on Ethernet according to claim 8, it is characterized in that: when one of them reads the delegation of a certain frame or continuously during rows of effective pixels from first memory or second memory, ensuing delegation or rows of effective pixels continue to read one of them from described first memory or second memory in the same frame.
10. the method for reseptance of the non-compression video based on Ethernet according to claim 9, it is characterized in that: when read one of them from first memory or second memory a frame valid pixel and need another memory from first memory or second memory in when reading the next frame valid pixel, if current described another memory is written into, then repeat to read described first memory or the second memory frame valid pixel in one of them.
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| CN103997385A (en) * | 2014-05-23 | 2014-08-20 | 北京中和卓远科技有限公司 | Data playback simulating method and system |
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| CN106791502A (en) * | 2017-01-23 | 2017-05-31 | 惠州Tcl移动通信有限公司 | A kind of jamproof display screen display control method and system |
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| CN102938839B (en) * | 2012-11-13 | 2016-08-17 | 浙江宇视科技有限公司 | A kind of monitoring frontend and encoder server |
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| CN104065963B (en) * | 2014-06-27 | 2018-03-06 | 广东威创视讯科技股份有限公司 | Coding/decoding system and its method, apparatus for being switched fast resolution ratio |
| CN104065963A (en) * | 2014-06-27 | 2014-09-24 | 广东威创视讯科技股份有限公司 | Encoding and decoding system, and resolution fast switching method and device thereof |
| CN106713751A (en) * | 2016-12-20 | 2017-05-24 | 惠州Tcl移动通信有限公司 | Image data transmission control method and system based on mobile terminal |
| CN106791502A (en) * | 2017-01-23 | 2017-05-31 | 惠州Tcl移动通信有限公司 | A kind of jamproof display screen display control method and system |
| CN106791502B (en) * | 2017-01-23 | 2020-07-14 | 惠州Tcl移动通信有限公司 | Anti-interference display control method and system for display screen |
| CN106973188A (en) * | 2017-04-11 | 2017-07-21 | 北京图森未来科技有限公司 | A kind of image transmission and method |
| US10771726B2 (en) | 2017-04-11 | 2020-09-08 | Tusimple, Inc. | Image transmission device and method including an image data receiver and a processor |
| US11438544B2 (en) | 2017-04-11 | 2022-09-06 | Beijing Tusen Weilai Technology Co., Ltd. | Image transmission device and method including an image data receiver and a processor |
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