CN101600099A - The real-time transmission synchronous control method of multi-angle video Flow - Google Patents
The real-time transmission synchronous control method of multi-angle video Flow Download PDFInfo
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Abstract
A kind of real-time transmission synchronous control method of multi-angle video Flow of field of picture communication.The present invention includes following steps: the multiplexing code stream of looking that encoder generates is resolved more, separate the transmission buffer queue that each visual angle bit stream data also is cached to each visual angle correspondence respectively; For each visual angle code stream is opened up independently real-time transmission stream, and the Real-time Transport Protocol head is carried out extending marking; For the real-time transmission stream at each visual angle is opened up independent channel; Adopt asynchronous each visual angle code stream that sends simultaneously of multithreading; Terminal buffers receives packet, according to synchronous extend information the packet that receives is sorted, and recovers the primary multi-view multiplex order.The invention provides software approach and realize the multi-view code stream Synchronization Control, reduced stability and flexibility that system cost has also improved system.Solved the square phenomenon of haplopia base code stream transmission code rate in the multi-angle video Network Transmission, from alleviated receiving terminal anti-jitter burden at all.
Description
Technical field
The present invention relates to the control method in a kind of image communication technology field, specifically is a kind of real-time transmission synchronous control method of multi-angle video Flow.
Background technology
The network stereo-television system is except that a plurality of links such as the decoding of the system multiplexing that relates to relevant program making, stereoscopic TV video format, stereo video compressed coding and code stream of stereoscopic TV, stereoscopic TV video code flow, stereoscopic TV demonstration, the synchronization video of various visual angles needs coding, transmission because three-dimensional video-frequency has more than traditional planar video, when combining, more relate to the various visual angles credible transmission of Network Synchronization and the control of stereo video signals synchronously with the network TV transmission technology.Consideration based on downward compatibility, promptly the various visual angles three-dimensional video-frequency is not only wanted to satisfy the requirement of freely looking the stereo display terminal, also to satisfy simultaneously the double vision stereo display terminal of wearing glasses or the requirement of conventional planar television terminal, consider the utilization ratio of access network transmission bandwidth simultaneously, the coupling certainly that must accomplish transmission bandwidth and all kinds of heterogeneous terminals during the transmission of various visual angles three-dimensional video-frequency code stream, promptly require the video code flow after encoding in each visual angle can separate independent transmission, terminal can optionally receive single visual angle, wherein two visual angles or all video code flow at visual angles.At this point, various visual angles three-dimensional video-frequency transmission method roughly divides two classes, one class can be called soft separation, promptly by the packet header mark being set to distinguish in the code stream packet from different visual angles, do not separate but this method realizes real various visual angles three-dimensional video-frequency code stream, but adopt time-multiplexed pattern to transmit by single real-time transmission stream.Another kind ofly can be called hard separation, the code stream that is about to each visual angle separates the back and sends by different real-time transmission stream, but needs the stationary problem between each visual angle code stream of solution.In terminal, multi-view code stream has only synchronous reception, decoding and broadcast, could produce good stereoeffect.But because the objectivity that the complexity of packet network, delay variation exist, and different clogged conditions and the time delay, shake and the packet loss that produce are difficult to guarantee the synchronous reception of multi-view code stream.So, no matter be soft separation or hard separation scheme, various visual angles independent transmission system all needs to use a cover Synchronization Control mechanism, comprises the synchronization mechanism of using RTP (Real-time Transport Protocol RTP) agreement, coordinates the stationary problem of each visual angle code stream.
Classical MVP (Multi-View Profile various visual angles class) scheme is only supported two visual angles, and main perspective is encoded in common MPEG-2 mode, and second visual angle information is directly passed through the TS flow transmission of MPEG-2 as enhancement layer and the synthetic back of main perspective.Two visual angles are highly couplings in this scheme, and advantage do not need to be extra synchronization mechanism, and two visual angle code streams are natural synchronously, directly rely on traditional single-view transmission plan transmission.Shortcoming is to realize the visual angle separation, brings extra network burden for traditional single-view user.Simultaneously, this scheme has also just limited the expansion of visual angle number owing to number of enhancement layers is limited, can't adapt to two application with upward angle of visibility.
Find by prior art documents, in the various visual angles system that uses MVC (Multi-View Coding multi-view video coding) scheme, each general visual angle video synchronization method representative such as Jongryool Kim and JongWon Kim in May, 2008 at IEEE Transact ions on ConsumerElectronics (IEEE consumer electronics journal) (vol.54, No.2) " the Real-TimeSynchronous Multi-View Video Transport System " that delivers on (multi-angle video transmission system method for synchronous in real time) literary composition, inquire at looking transmission plan more, and designed a cover and looked code stream Synchronization Control mechanism more, method for synchronous is summarized as follows, the method that increases the hardware synchronization clock when relying on video acquisition between each visual angle video realizes, adopt the mode of soft separation during Network Transmission, it is synchronous to rely on bag sequence number in the real-time Transmission stream protocol (Real-time Transport Protocol) to carry out the inside of each visual angle video code flow simply.This design can be used under the particular experiment environment, but has following shortcoming: 1, rely on the hardware synchronization clock synchronously fully between each visual angle video code flow of this scheme, must be equipped with accurate hardware synchronization equipment during video acquisition, system cost is high.2, this scheme adopts the mode of soft separation to carry out the multi-view code stream separation, can only could distinguish the visual angle more than four layer protocols, and general route exchange device can only be resolved to three layer protocols, and this has improved requirement to the routing device in the whole transmission path.3, this scheme simply adopts time division multiplexing, when conventional planar decoding and displaying terminal receives the single-view code stream, receives instantaneous code check and presents blocking artifact, and code stream is extremely unstable, needs the terminal network receiving equipment that stronger anti-jitter ability is arranged.4, the expansion of transport stream parameter is looked code stream, inapplicable two transmission with the multi-video code stream of upward angle of visibility, the range of application of the system of restriction about being provided with and only supporting.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of effective multi-angle video Flow real-time transmission synchronous control method is provided.The present invention separates on the basis of coding at the MVC multi-angle video Flow, each visual angle video code flow is cushioned level and smooth reformation, the different huge code check shake that causes in when fundamentally effectively improving the video code flow transmission because visual angle improves multi-angle video Flow real-time Transmission quality.
The present invention is achieved by the following technical solutions, the present invention includes following steps:
The first step: the various visual angles multiplexing code stream that encoder generates is resolved, be buffered to the buffer queue that independently is provided with into each visual angle respectively after each code stream is separated;
Second step: for each visual angle code stream is opened up independently real-time transmission stream, and real-time transmission stream Real-time Transport Protocol head is carried out extending marking, record visual angle numbering (View_ID) and main perspective Ref. No. (Main_SEQ) are as the Synchronization Control label;
The 3rd step: for the real-time transmission stream at each visual angle is opened up independently channel, with each code stream independent transmission;
The 4th step: send each visual angle code stream simultaneously according to each visual angle average bit rate is asynchronous, thereby the level and smooth code check of each visual angle code stream reduces the terminal network shake, obtains main perspective Ref. No. (Main_SEQ) simultaneously;
The 5th step: the terminal buffers packet, according to real-time transmission stream protocol headers extend information the packet that receives is sorted, recover original various visual angles multiplexing code stream order, and output to decoder.
Real-time transmission stream Real-time Transport Protocol head is expanded described in second step is meant that expansion comprises that the Synchronization Control label of visual angle numbering (View_ID) and main perspective Ref. No. (Main_SEQ) uses synchronously for multi-view code stream.Visual angle numbering (View_ID) is used for mark different visual angles data, generally can with reference in the first step code stream analyzing to the differentiation strategy of different visual angles.Main perspective Ref. No. (Main_SEQ) refers to the sequence number (Sequence Number) of last RTP bag at the last frame place that sent in the main perspective code stream.Terminal is used the own sequence number of RTP packet, in conjunction with the main perspective Ref. No. of expansion and visual angle numbering can be exactly to the packet that the receives original multiplexing code stream sequence of recovery that sort.
Open up independently that channel is meant for the real-time transmission stream at each visual angle described in the 3rd step, setting up transmission channel the 3rd layer of procotol for the different visual angles real-time transmission stream, is that routing forwarding equipment or terminal receiving equipment are created the possibility of distinguishing the different visual angles real-time transmission stream.The present invention writes the IPv4 packet header by the IPv4 protocol headers is expanded with the visual angle numbering, thereby provides the visual angle to distinguish foundation for transmitting route.In addition, for the mode that pushes three-dimensional television in the multicast mode, also can set up independently that the mode of multicast group realizes by the different visual angles code stream, receiving terminal receives each visual angle code stream by the mode selectivity that adds different multicast group.
Level and smooth multi-view code stream described in the 4th step is in order fundamentally to avoid in the multi-view code stream owing to the different blocking artifacts that cause of the code check of each visual angle code stream, the multi-view code stream independence output buffers formation that utilizes first step code stream analyzing to obtain, send simultaneously after in conjunction with multithreading the code stream of multi-view code stream in same frame type cycle period smoothly being reformed according to each visual angle average bit rate difference, thereby make total bitrate and the single-view code check can both be basicly stable.Described frame type circulating cycle index futures are in multi-view code stream, and each visual angle frame is numbered different circulations according to the visual angle and occurred, and frame type circulating cycle index futures begin to next main perspective frame arrival this segment encode stream before from any one main perspective frame.Described employing asynchronous transmission pattern is meant that the main perspective code stream is carried previous frame time to begin to send, to obtain the reference information of other visual angle code streams and main perspective code stream.Main perspective code stream first frame sends the postscript that finishes and records last real-time transmission stream RTP bag sequence number, and promptly the second step described main perspective Ref. No. (Main_SEQ) is done sync tag for other visual angle code streams in this frame type cycle period.
The original various visual angles multiplexing code stream of recovery described in the 5th step refers to the Synchronization Control label according to the definition of second step in proper order, after dividing three levels that the RTP packet that receives is sorted according to the main perspective Ref. No. (Main_SEQ) in the real-time transmission stream, visual angle numbering (View_ID), RTP packet number (Sequence Number) successively, resolve the RTP load restoration again and go out the source code flow order.The real-time transmission stream RTP data from all visual angles that described data cached one or several limited frame time of bag finger receiving end buffer memory received in the cycle are so that to the reformation of sorting of the RTP packet in the buffering range.
Compared with prior art, the present invention has following useful effect: the invention provides software approach and realize the multi-view code stream Synchronization Control, need not rely on accurate hardware synchronization clock, reduced stability and flexibility that system cost has also improved system.The present invention has effectively solved the square phenomenon of haplopia base code stream transmission code rate in the multi-angle video Network Transmission, has fundamentally improved the code stream shake, has alleviated receiving terminal anti-jitter burden.The present invention has designed a cover based on method for synchronous between the multi-view code stream of real-time transmission stream RTP parameter expansion, and terminal can be recovered original multiplexing code stream synchronized relation easily.
Description of drawings
Fig. 1 is the inventive method flow chart;
Fig. 2 is original various visual angles multiplexing code stream schematic diagram;
Fig. 3 is a code stream separated structures schematic diagram of the present invention;
Fig. 4 is the schematic diagram of real-time transmission stream protocol headers spreading parameter of the present invention;
Fig. 5 is the asynchronous structural representation that sends simultaneously of the present invention;
Fig. 6 is the schematic diagram of the original multiplexing code stream of terminal synchronizes of the present invention.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, the system of present embodiment is divided into three parts, the code stream transmitting terminal, and independent channel transmission ends and receiving terminal, present embodiment may further comprise the steps:
The first step: the RTP send server obtains the various visual angles multiplexing code stream that encoder generates, the visual angle parses policy of setting up when being multiplexed with MPEG2-TS stream according to the multi-view code stream system layer is resolved, according to different visual angles, with being buffered to the buffer queue that independently is provided with into each visual angle respectively after the code stream separation, wait to be sent;
Second step: the RTP send server is opened up independently real-time transmission stream for each visual angle code stream, and the real-time transmission stream protocol headers is carried out extending marking, and record visual angle numbering (View_ID) and main perspective Ref. No. (Main_SEQ) are as the Synchronization Control label;
The 3rd step: the RTP send server sends each visual angle code stream simultaneously according to its average bit rate, thereby the level and smooth code check of each visual angle code stream reduces terminal network and shakes.Adopt the asynchronous transmission strategy simultaneously,, use synchronously for multi-view code stream so that obtain main perspective Ref. No. (Main_SEQ).Asynchronous transmission strategy embodiment illustrates referring to Fig. 4;
The 4th step: the independent channel transmission ends is according to receiving terminal display device type difference, and selectivity is transferred to receiving terminal with corresponding visual angle code stream.Promptly send and look TS stream (comprising main perspective code stream and visual angle 2 code streams and other visual angle code streams) more, send binocular TS stream (being main perspective code stream and visual angle 2 code streams), send main perspective TS stream to the haplopia user to the binocular vision user to the stereopsis user.
The 5th step: the data cached bag of receiving terminal, according to real-time transmission stream protocol headers extend information the packet that receives is sorted, resolve load information and recover original various visual angles multiplexing code stream order, and output to decoder.Ordering strategy embodiment illustrates referring to Fig. 5;
As shown in Figure 2, I1, P1, B1 represent I, P, the B frame of main perspective; I2, P2, B2 represent I, P, the B frame at visual angle 2; I3, P3, B3 represent I, P, the B frame at other visual angles.
As shown in Figure 3, present embodiment is according to the visual angle difference, the various visual angles multiplexing code stream is carried out the various visual angles separation, with main perspective code stream, visual angle 2 code streams and and other visual angle code streams to be buffered to separately transmission buffer queue etc. respectively to be sent, be about to the main perspective bit stream buffer to the main perspective buffer queue, visual angle 2 bit stream buffers are to visual angle 2 buffer queues, and other visual angle bit stream buffers are to other visual angle buffer queues.The data order occurs according to the order of I1, I2, I3, P1, P2, P3, B1, B2, B3 in the original various visual angles multiplexing code stream.After various visual angles are separated I1, P1, B1 frame data bag are extracted and buffering; I2, P2, B2 frame data bag are extracted and buffering; I3, P3, B3 frame data bag are extracted and buffering;
As shown in Figure 4, present embodiment is expanded the real-time transmission stream protocol headers for realizing Synchronization Control between code stream, opens up payload 32bit foremost, preceding 4bit is used to write down visual angle numbering (View_ID), and back 16 are used to write down main perspective Ref. No. (Main_SEQ).Other Field Definitions of real-time transmission stream protocol headers are at RFC3550.
V:Version, version.Identification RTP version.
P:Padding, the gap.When being provided with, packet comprises one or more modification space hytes, and wherein this part does not belong to payload.
X:Extension, extension bits.When being provided with,, an extension header is set according to specified format in a fixing back.
CC:CSRC Count comprises the numbering of CSRC identifier (in fixing head back).
M:Marker, mark.The explanation of mark is by the Profile document definition.Allow critical event such as frame boundaries in data packet stream, to carry out mark.
PT:Payload Type, the form of identification RTP payload, and determine its explanation by application program.The Profile files specify be encoded to the default static mapping of Payload form from Payload.Other Payload Type coding may be realized Dynamic Definition by non-RTP method.
Sequence Number: RTP packet of every transmission, sequence number increases by 1.The recipient can detect losing of packet and restore data packet sequence successively.
Timestamp: the sampling time of first eight hyte in the reflection RTP packet.Sampling time must in time provide linear no change increment to obtain by clock, to support synchronously and Jitter Calculation.
SSRC: synchronisation source.This identifier is selected at random, is intended to guarantee do not exist in same RTP session two synchronisation sources to have identical SSRC identifier.
CSRC: contribution source identifier.Discern the contribution source of the payload in this packet.
Payload: load data.
As shown in Figure 5, I1, P1, B1 represent I, the P of main perspective, the TS packet at B frame difference place; I2, P2, B2 represent I, the P at visual angle 2, the TS packet at B frame difference place; I3, P3, B3 represent I, the P at other visual angles, the TS packet at B frame difference place; The asynchronous transmission strategy is described below: the main perspective code stream is carried previous frame time and is sent, promptly begin to send the main perspective buffer queue earlier, per 7 TS seal and install to a RTP bag, after transmission I1 frame data bag finished, the sequence number of getting last RTP bag used for I2, I3 frame as the main perspective Ref. No.; Begin to send the I2 frame of visual angle 2 buffer queues, the I3 frame and the main perspective buffer queue P1 frame of other visual angle buffer queues then.After transmission P1 frame data bag finished, the sequence number of getting last RTP bag used for P2, P3 frame as the main perspective Ref. No.; The main perspective buffer queue beginning shifts to an earlier date at least one frame data than other visual angles all the time, thereby other visual angles can in time obtain the main perspective Ref. No..
As shown in Figure 6, the present embodiment terminal sorts to the real-time transmission stream RTP packet that receives according to the synchronous spreading parameter of real-time transmission stream RTP.Among the figure in each packet synchronization parameter form by three, represent the main perspective Ref. No. for first, represent visual angle numbering, the 3rd representative data bag self sequence number for second.The source code flow order is shown among the figure first group.Suppose terminal receives under complex network environment code stream order shown in second group, need that ordering return to first group of order through synchronization policy.Ordered steps is as follows: the first step is promptly recovered 101 and 202 order according to the ordering of main perspective Ref. No., and the two there is not change in proper order here, does not need to adjust.Second step will be assisted according to the main perspective Ref. No. and be looked the perspective data bag and insert and mainly to look reference data bag in the data packet queue (being the packet that sequence number equals this main perspective Ref. No.) afterwards, be about to all No. 115 bags and No. 118 bags and be inserted into 101 back, all No. 216 bags and No. 219 bags are inserted into 202 back, in the present embodiment No. 216 bags are adjusted to 202 back.Auxilliary the look perspective data bag of the 3rd step to each reference data bag back promptly wraps, wraps for No. 115 and No. 118 bags all No. 101, sorts according to the visual angle numbering, exchanges 128 and 115 in the present embodiment.At last in same perspective data bag internal condition packet self sequence number ordering.
Claims (7)
1. the real-time transmission synchronous control method of a multi-angle video Flow is characterized in that, may further comprise the steps:
The first step: the various visual angles multiplexing code stream that encoder generates is resolved, be buffered to the buffer queue that independently is provided with into each visual angle respectively after each code stream is separated;
Second step:, and the real-time transmission stream protocol headers is carried out extending marking for each visual angle code stream is opened up independently real-time transmission stream;
The 3rd step: for the real-time transmission stream at each visual angle is opened up independently channel, with each code stream independent transmission;
The 4th step: send each visual angle code stream simultaneously according to each visual angle average bit rate is asynchronous, thereby the level and smooth code check of each visual angle code stream reduces the terminal network shake, obtains main perspective Main_SEQ Ref. No. simultaneously;
The 5th step: the terminal buffers packet, according to real-time transmission stream protocol headers extend information the packet that receives is sorted, recover original various visual angles multiplexing code stream order, and output to decoder.
2, the real-time transmission synchronous control method of multi-angle video Flow according to claim 1, it is characterized in that the real-time transmission stream protocol headers is carried out extending marking be meant described in second step: record View_ID visual angle numbering and main perspective Main_SEQ Ref. No. are as the Synchronization Control label.
3, the real-time transmission synchronous control method of multi-angle video Flow according to claim 1, it is characterized in that, described in the 3rd step channel is meant for the real-time transmission stream at each visual angle is opened up independently: set up transmission channel the 3rd layer of procotol for the different visual angles code stream.
4, the real-time transmission synchronous control method of multi-angle video Flow according to claim 1, it is characterized in that, asynchronous the transmission simultaneously described in the 4th step is meant: the main perspective code stream is carried previous frame time begin to send, obtain the reference information of other visual angle code streams and main perspective code stream.
5, the real-time transmission synchronous control method of multi-angle video Flow according to claim 1, it is characterized in that, the code check of level and smooth each the visual angle code stream described in the 4th step is meant: the buffer queue that the multi-view code stream of utilizing first step code stream analyzing to obtain is independently exported, the code stream of multi-view code stream in same frame type cycle period smoothly reformed according to each visual angle average bit rate difference.
6, the real-time transmission synchronous control method of multi-angle video Flow according to claim 1, it is characterized in that, the original various visual angles multiplexing code stream of recovery described in the 5th step is meant in proper order: after dividing three levels that the RTP packet that receives is sorted according to the main perspective Main_SEQ Ref. No. in the real-time transmission stream, View_ID visual angle numbering, RTP packet number successively, resolve the RTP load restoration again and go out the source code flow order.
7, the real-time transmission synchronous control method of multi-angle video Flow according to claim 1, it is characterized in that the data cached bag described in the 5th step is meant: the real-time transmission stream RTP data from all visual angles that one or several limited frame time of terminal buffers received in the cycle.
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| EP2713609A1 (en) | 2012-09-28 | 2014-04-02 | Stockholms Universitet Holding AB | Dynamic delay handling in mobile live video production systems |
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| CN114760455A (en) * | 2022-03-30 | 2022-07-15 | 广东博华超高清创新中心有限公司 | Multi-channel video multi-view scene coding and decoding method based on AVS3 coding framework |
| CN114760455B (en) * | 2022-03-30 | 2023-10-13 | 广东博华超高清创新中心有限公司 | Multi-channel video multi-view scene coding and decoding method based on AVS3 coding framework |
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