CN105991586A - Multimedia clock coordinated synchronization method in heterogeneous network - Google Patents
Multimedia clock coordinated synchronization method in heterogeneous network Download PDFInfo
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Abstract
The invention provides a multimedia clock coordinated synchronization method in a heterogeneous network. With the method, a problem that contents and services in different networks can not be integrated precisely in a heterogeneous integration network because of lack of a multi-clock compatibility mechanism in the existing multimedia system and protocol can be solved. A data encapsulation module, a data sending module, a data receiving module, and a data analysis and presentation module are employed. With a multimedia clock coordination synchronization mechanism, compatibility of various network clock synchronization mechanisms in a heterogeneous network is realized; on the basis of multimedia data in a unified encapsulation mode, signaling tables of correspondence relationships of different blocks are provided. Therefore, integration of various network resources can be realized well, diversity and stability of multimedia services in the heterogeneous integration network can be improved, unified management of multimedia contents can be realized conveniently, and repeated data encapsulation and processing time and resource wasting due to different clock synchronization mechanisms can be reduced, and the good service experience can be provided for the user.
Description
Technical field
The present invention relates to a kind of mechanism realizing Multimedia Clock coordinate synchronization in heterogeneous network, in particular, relate to
A kind of coordinate and Tong Bu machine at Two-way Network and the Multimedia Clock realizing the whole network in the mixing that unidirectional network forms, heterogeneous network
System.
Background technology
Along with the maturation of Digital object identifier and commonly used, especially fine definition, high resolution digital video business
Development extensively and profoundly, while user has experienced more preferable digital media service, also to numeral media business propose
Higher requirement.Due to the extensive application of digital media technology, multimedia programming synchronizes between stream and flows inter-sync problem also
Day by day highlight.What is more important, at the existing unidirectional network with television network broadcast as representative and with broadband network as generation
In the Two-way Network of table, have employed different multimedia time synchronization mechanisms and agreement, cause two kinds of network multimedias to service not
Compatibility, make user not enjoy advantage and facility that isomery UNE business is brought.
Current most of multi-media protocol both defines the Time Synchronization Mechanism of respective complete set, it is possible at acceptable model
Enclose and interior compare successfully resolution protocol inner multimedia system clock stationary problem, as digital TV field is commonly used
MPEG2-TS agreement uses 27M system clock STC (System Time Clock) to combine PCR (Program in Media Stream
Clock Reference) carry out multimedia service with PTS (Presentation Time Stamp) information clock Tong Bu；Broadband
HTTP common in network, Real-time Transport Protocol use Coordinated Universal Time(UTC) UTC (Coordinated Universal Time) combine
Unified NTP NTP (Network Time Protocol) time stamp completes the clock of multimedia service and synchronizes.Although
So, it is contemplated that public users is indifferent to the concrete technology of multimedia service, only focuses on service quality and effect, thus
During in practical situation, user is often in isomery hybrid network, and wish to enjoy indifference, stable multimedia service.
It has a problem in that different network systems, in other words the incompatibility of clock synchronization mechanism in different agreement, cause user with for the moment
Between can only enjoy a certain business, and widely media business and the more high-quality that isomery hybrid network brings cannot be enjoyed
Media services.Multi-internet integration has become as trend, and heterogeneous networks has respective advantage, complements each other, and isomery merges net
Network should provide the user preferably service, but different clock synchronization mechanism makes this target be difficult to, many matchmakers
System system is difficult to accurately to mate, integrate in heterogeneous networks content and service.
On the other hand, the rich of digital media resource meets the media consumption demand that user is growing, media resource
Between relevance also provide the foundation for the integration of media resource.Nowadays multimedia service is the most no longer by physical network
Restriction, heterogeneous networks can be enjoyed the high-quality multimedia service of comparison, but create another accordingly
Problem, identical data content needs to be packaged into different media formats in heterogeneous networks different agreement, not only increases
Extra work amount, and different media formats has to rely on physics bar due to the mutually incompatible user of causing of clock information
Part could obtain multimedia service, do not meet Digital Media consume at any time, everywhere, any terminal, the trend of any content.
Better method is, multi-medium data uses unified encapsulation format, this encapsulation format can compatible existing multiple time
Clock information, simultaneously should compatible Two-way Network and the Time Synchronization Mechanism of unidirectional network, media in the multimedia system of heterogeneous network
Transmitting terminal all uses host-host protocol based on IP (Internet Protocol) to send data, demarcate time stamp, provides different simultaneously
The signaling table of the corresponding relation of clock, client can adjust used clock protocols and mechanism as required.Such as,
When broadband network disconnects, user cannot use Network Time Protocol complete clock synchronize, but still can by other time
Clock synchronous protocol uses radio network viewing TV programme.Its difficulty is: existing multimedia system be typically all corresponding to
Certain particular network, needs the multimedia system under isomery hybrid network reasonable in design, in order to compatible heterogeneous networks characteristic；
Existing mature protocol does not all account for the demand of heterogeneous network, needs to redesign according to the requirement of compatible different clocks mechanism
Media encapsulation format and host-host protocol.
Summary of the invention
For defect of the prior art, it is an object of the invention to provide the Multimedia Clock under a kind of heterogeneous network and coordinate
Synchronous method, thus add existing multimedia system and the multi-clock relation mechanism of agreement shortage, solve existing many matchmakers
System system and agreement are incompatible and cannot provide the problem of isomery UNE association service due to synchronised clock, and are new
The IP-based heterogeneous network of a generation provides clock synchronization solutions.
For achieving the above object, the present invention is by the following technical solutions:
A kind of Multimedia Clock coordinate synchronization method under heterogeneous network, described method uses four resume module: data are sealed
Die-filling piece, data transmission blocks, data reception module, data parsing with present module, wherein:
Described data package module, original multi-medium data is carried out unified form and is encapsulated into MPU number by this module
According to, MPU packet other timestamp information Han frame level, by Information encapsulation relevant for all media in file, including many
Media package file and signaling file, submit necessary information with presenting module for data parsing, during particularly standard compatible
Between stab information；
Described data transmission blocks, the packet that this module sends is containing clock associated description signaling, the media of labelling timestamp
Data, packets fields form is corresponding with the data form of data package module, it is ensured that the literary composition that data package module generates
Part necessary information can correctly be sent to client, unpacks with recovery module for data receiver simultaneously and carries with data recovery operation
For reference format；
Described data receiver and recovery module, this module receives, recovers media data and signaling information, and calibration receiving terminal is originally
Ground clock, the various media informations that encapsulating data module and sending module provides correctly recover in this locality, instruct number
Realize correctly exporting and presenting with presenting module according to parsing；
Described data parsing with present module, this module resolve signaling table clock relevant information, guide decoder be correctly decoded
Presenting with browser, by data transmission blocks and data receiver and recovery module, this module encapsulates data module and comprises
File content and related signaling control the most correctly presented by receiving terminal, the advantage of native system is presented to use intuitively
Family.
Preferably, described data package module, wherein: MPU form is based on ISOBMFF (ISO Base Media File
Format), increase new box type on this basis, be divided into time series data and non-sequential data simultaneously, to all of former
Beginning data type carries out the encapsulation of consolidation form, wherein time series data predominant package audio-video source data, except media track
The hint track that outer interpolation is new, and the PTS clock information of media content is provided in hint track sample, and non-sequential number
According to coding and present uncorrelated with clock, so need not arrange PTS clock information；PTS clock information is by encoder
Clock source is calculated, so when media data is packaged into MPU form at data frame level correspondence PTS clock
Information.
Preferably, described data transmission blocks, wherein each field of host-host protocol part of MMT all encapsulates with unified media
The time series data field of form MPU is consistent, reaches multi-medium data storage and the concordance transmitted and rapid translating,
While transmitting multi-medium data, NTP service is also being carried out, and receiving terminal local clock is carried out periodically correcting, it is possible to
Prevent the accumulative effect of error time, it is ensured that the quality of multimedia service.
Preferably, described data transmission blocks, when receiving terminal is unsatisfactory for the condition of NTP service operation, utilize MMT
CRI signaling table in agreement, it is provided that the corresponding relation of NTP Yu PCR, receiving terminal flowed by acceptance in NTP time
Stab and converse PCR information according to this table, thus correct the clock of this locality, reach clock and synchronize and multimedia synchronous, CRI
Signaling table periodically updates, it is ensured that the precise synchronization of whole network clock.
Preferably, described data receiver and recovery module, with the NTP clock in the Media Stream obtained or clock time
Stamp is used for correcting the clock of receiving terminal, makes the time synchronized of the whole network, meanwhile, the other presentation time stamp of the frame level in media data
Decoder is guided to correctly decode.
Preferably, described data parsing with present module, when being in suspension state, carry out clock according to STC mechanism
Synchronize: resolve CRI signaling table and obtain PCR information, the system clock that correction is local, utilize in media data simultaneously
The other PTS information of frame level knows that decoder decodes；If being in networking state, then ignore PCR Yu the PTS information in data,
Network Time Protocol is used to carry out clock synchronization: receiving terminal utilizes NTP to service regular calibration local clock, utilizes in Media Stream
Timeline administrative mechanism guide decoder decoding.
Compared with prior art, the present invention has a following beneficial effect:
Use technical scheme, can lack, for existing multimedia system and agreement, the mechanism that multi-clock is compatible,
Cause in isomery UNE cannot content and the problem of service in precise integration heterogeneous networks, by increasing Multimedia Clock
Coordinate synchronization mechanism realizes compatible multiple network clock synchronization mechanism under heterogeneous network, uses unified encapsulation format multimedia
Data, it is provided that the signaling table of the corresponding relation of different clocks, are both beneficial to integrate multiple network resources, improve isomery and merge net
Rich and the stability of multimedia service under network, also allows for the unified management of content of multimedia, reduces because of clock synchrodrive
Make time and the wasting of resources that Data duplication that is different and that cause encapsulates and processes, bring more preferable service experience to user.
Accompanying drawing explanation
The detailed description made non-limiting example with reference to the following drawings by reading, other of the present invention is special
Levy, purpose and advantage will become more apparent upon:
Fig. 1 is clock coordinate synchronization schematic diagram in multimedia system；
Fig. 2 is general MPU (Media Processing Unit) encapsulation format；
Fig. 3 is that receiving terminal clock synchronizes flow chart；
Fig. 4 is the time series data field consistent amendment schematic diagram with unified media encapsulation format MPU.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.Following example will assist in those skilled in the art
Member is further appreciated by the present invention, but limits the present invention the most in any form.It should be pointed out that, the common skill to this area
For art personnel, without departing from the inventive concept of the premise, it is also possible to make some deformation and improvement.These broadly fall into
Protection scope of the present invention.
Nowadays, the network integration has become as trend, utilizes the resource of the whole network to carry out advantage integration, wherein needs the pass solved
Key has a problem in that the clock coordinate synchronization mechanism of design the whole network.In view of the compatibility to existing network, this whole network clock
Mechanism should be able to compatible existing clock protocols and mechanism.
The clock system of existing main flow and agreement mainly have two, and one is the MPEG2-TS used in radio data system
Standard, clock synchronization section therein employs STC/PCR/PTS mechanism, uses transmission regular calibration mode in stream；
Another is NTP (the Network Time Protocol) agreement used in internet system, uses and transmits regular calibration outside stream
Mode.So the Multimedia Clock synchronization mechanism under heterogeneous network answers compatible both the above clock protocols, and when two kinds
Clock mutually should map in the overall situation, determines the clock protocols of real use according to the actual requirements with condition.
Below as a example by MMT (MPEG Media Transport) standard, introduce the Multimedia Clock association under heterogeneous network
Adjust synchronization mechanism.Certainly, this mechanism is not limited to MMT standard, it is also possible to be applied to other standards and scheme.MMT
Full name is MPEG media transport protocol, international standard group MPEG formulate, it is possible to carry out media unifying encapsulation,
Permission media data is at Two-way Network and unidirectional transfers on network, and has redefined transmission for emerging media application scene
Method and present mechanism.
Different links in multimedia system are required for modifying existing system and agreement, below with a set of the most
As a example by media system, as it is shown in figure 1, be divided into data encapsulation, data transmission, data receiver, data parsing and present mould
Clock coordinate synchronization mechanism is described by block 4 modules respectively.
Data encapsulate:
Generate unified MPU (Media Processing Unit) file, comprise the other timestamp information of frame level
Encoded device, generates original audio frequency, video flowing, carries out unified form and be encapsulated into MPU data.MPU
Form, based on ISOBMFF (ISO Base Media File Format), increases new box type, simultaneously on this basis
It is divided into time series data and non-sequential data, all of original data type is carried out the encapsulation of consolidation form, as shown in Figure 2.
Wherein time series data predominant package audio-video source data, add new hint track in addition to media track, and at cuetrack
Road sample provides the PTS clock information of media content, rather than the coding of time series data and present uncorrelated with clock, institute
Need not arrange PTS information.PTS clock information is calculated by encoder 27M clock source, so at media number
According to when being packaged into MPU form at data frame level correspondence PTS clock information.PTS information is in MPU file position
Putting shown in Fig. 2, the design of concrete MMTHSample is as follows:
The field semantics newly increased is as follows, and other field semantics are with reference to ISO/IEC 23008-1:
This 33 bit field of PTS (presentation_time_stamp) is the cited presentation time stamp accessing unit.
The coding semantic description of PTS field is with reference to ISO/IEC 13818-1.
Reserved reserved bit.
Data send:
Comprise the transmission of clock associated description signaling and the transmission of the media data of labelling time stamp
Due to the extensive application of IP agreement, following isomery UNE should be also based on IP agreement, no matter which kind of
All can stamp current timestamp for packet during application layer protocol transmitting multimedia data, receiving terminal can be according to this time
Stamp has contrasted with local clock that sequential is multimedia accurately to be presented.And current application layer protocol the most all fixes a kind of clock
Agreement, wherein the host-host protocol part of MMT also only considered the labelling of NTP time stamp, the many matchmakers of sequential at heterogeneous network
In body application, it is necessary to consider to be unsatisfactory for and the synchronization mechanism of multimedia system during NTP clock source communication condition, and
Want compatible multiple network clock protocols, need to revise this partial content, add after the packet header of original time series data MFU
Add the PTS field of 33, record the presentation time stamp of these frame data, and 7 reserved fields, reserved for extension in future,
As shown in Figure 4.The each field of Fig. 4 is all consistent with the time series data field of unified media encapsulation format MPU, Ke Yida
To multi-medium data storage and the concordance transmitted and rapid translating.While transmitting multi-medium data, NTP service also exists
Carrying out, receiving terminal local clock is carried out periodically correcting, it is possible to prevent the accumulative effect of error time, it is ensured that multimedia
The quality of service.
If receiving terminal is unsatisfactory for the condition of NTP service operation, above-mentioned mechanism can not solve clock and synchronize same with multimedia
The problem of step.Now can utilize the CRI signaling table in MMT agreement, it is provided that the corresponding relation of NTP Yu PCR,
NTP time stamp during receiving terminal can be flowed by acceptance converses PCR information according to this table, thus corrects the 27M of this locality
Clock, reaches clock and synchronizes and multimedia synchronous.CRI signaling table periodically updates, it is ensured that whole network clock accurately with
Step.NTP Yu PCR corresponding relation such as following table in MMT, STC_sample correspondence PCR value,
NTP_timestamp_sample correspondence NTP value, specifically refers to ISO/IEC 23008-1.
Data receiver and recovery:
Receive, recover media data and signaling information, calibrate receiving terminal local clock
No matter receiving terminal is taken the initiative obtains or passively receives data, all should correctly recover media data and signaling letter
Breath.NTP clock in the Media Stream obtained or 27M System Clock time stamp, for correcting the clock of receiving terminal, make
The time synchronized of the whole network.Meanwhile, the other presentation time stamp of the frame level in media data guides decoder to correctly decode.
Data parsing with present:
Resolve signaling table clock relevant information, guide decoder to be correctly decoded and present with browser
Owing to client has a lot of form of expression, in multimedia system as a example by browser, data parsing is described and presents mould
The processing procedure of block clock coordinate synchronization mechanism, in like manner can apply to special-purpose software client, special player etc..
Receiving terminal first passes through terminal networking detection module, confirms local networking state, interface parameters and result is fed back simultaneously
Inside browser.Browser judges whether this locality networks, if networking, then keeps and ntp server periodical communication,
With the local UTC clock of correction, the most constantly receive and read MMTP stream, ignoring PCR Yu the PTS letter in data
Breath, utilizes the NTP time in CI (Composition Information) and MPU, instructs decoder to be correctly decoded and clear
Device of looking at correctly presents；If not networking, first read the CRI signaling table that transmitting terminal periodically sends, by wherein
STC_sample field obtains the UTC time that server end is correct, the system clock that calibration is local, also not disconnecting simultaneously
Receive and read MMTP stream, obtain MPU data and metadata information, wherein metadata MFU head comprises Frame
PTS information, then on the basis of local system clock, instruct player to be correctly decoded with reference to PTS temporal information,
And browser correctly presents, particular flow sheet is shown in Fig. 3.MMT also have several other kinds of except CRI signaling table
Signaling table such as CI (Composition Information), is described by the clock corresponding relation of CRI, and receiving terminal can obtain
The synchronization of the whole network, thus better profit from various signaling and control rendering and presenting of browser, bring brand-new body for user
Test.
The present invention is both beneficial to integrate multiple network resources, and under raising isomery UNE, multimedia service is rich and stable
Property, also allow for the unified management of content of multimedia, reduce the Data duplication encapsulation caused because clock synchronization mechanism is different and
The time processed and the wasting of resources, bring more preferable service experience to user.
Above the specific embodiment of the present invention is described.It is to be appreciated that the invention is not limited in
Stating particular implementation, those skilled in the art can make various deformation or amendment within the scope of the claims,
This has no effect on the flesh and blood of the present invention.
Claims (6)
1. the Multimedia Clock coordinate synchronization method under a heterogeneous network, it is characterised in that described method uses four
Resume module: data package module, data transmission blocks, data reception module, data parsing and present module, wherein:
Described data package module, original multi-medium data is carried out unified form and is encapsulated into MPU number by this module
According to, MPU packet other timestamp information Han frame level, by Information encapsulation relevant for all media in file, including many
Media package file and signaling file, submit necessary information with presenting module for data parsing, during particularly standard compatible
Between stab information；
Described data transmission blocks, the packet that this module sends is containing clock associated description signaling, the media of labelling timestamp
Data, wherein packets fields form is corresponding with the data form of data package module, it is ensured that data package module generates
File necessary information can correctly be sent to client, simultaneously for data receiver with recover module and unpack and data recover behaviour
Make to provide reference format；
Described data receiver and recovery module, this module receives, recovers media data and signaling information, and calibration receiving terminal is originally
Ground clock, the various media informations that encapsulating data module and sending module provides correctly recover in this locality, instruct number
Realize correctly exporting and presenting with presenting module according to parsing；
Described data parsing with present module, this module resolve signaling table clock relevant information, guide decoder be correctly decoded
Presenting with browser, by data transmission blocks and data receiver and recovery module, this module encapsulates data module and comprises
File content and related signaling control the most correctly presented by receiving terminal, the advantage of native system is presented to use intuitively
Family.
Multimedia Clock coordinate synchronization method under a kind of heterogeneous network the most according to claim 1, its feature exists
In, described data package module, wherein: MPU form, based on ISOBMFF, increases new box class on this basis
Type, is divided into time series data and non-sequential data simultaneously, all of original data type carries out the encapsulation of consolidation form, its
Middle time series data predominant package audio-video source data, add new hint track in addition to media track, and in hint track
Sample provides the PTS clock information of media content, rather than the coding of time series data and present uncorrelated with clock, so
Need not arrange PTS clock information；PTS clock information is calculated by encoder clock source, so seals at media data
At data frame level correspondence PTS clock information when dressing up MPU form.
Multimedia Clock coordinate synchronization method under a kind of heterogeneous network the most according to claim 1, its feature exists
In, described data transmission blocks, wherein each field of host-host protocol part of MMT all with unified media encapsulation format MPU
Time series data field consistent, reach multi-medium data storage with transmission concordance and rapid translating, transmit multimedia
While data, NTP service is also being carried out, and receiving terminal local clock is carried out periodically correcting, it is possible to when preventing error
Between accumulative effect.
Multimedia Clock coordinate synchronization method under a kind of heterogeneous network the most according to claim 1, its feature exists
In, described data transmission blocks, when receiving terminal is unsatisfactory for the condition of NTP service operation, utilize in MMT agreement
CRI signaling table, it is provided that the corresponding relation of NTP Yu PCR, receiving terminal flowed by acceptance in NTP time stamp according to this table
Converse PCR information, thus correct the clock of this locality, reach clock and synchronize and multimedia synchronous, CRI signaling table week
Phase property updates, it is ensured that the precise synchronization of whole network clock.
5. according to the Multimedia Clock coordinate synchronization method under a kind of heterogeneous network described in any one of claim 1-4,
It is characterized in that, described data receiver and recovery module, with the NTP clock in the Media Stream obtained or clock time
Stamp is used for correcting the clock of receiving terminal, makes the time synchronized of the whole network, meanwhile, the other presentation time stamp of the frame level in media data
Decoder is guided to correctly decode.
6. according to the Multimedia Clock coordinate synchronization method under a kind of heterogeneous network described in any one of claim 1-4,
It is characterized in that, described data parsing with present module, when being in suspension state, carry out clock according to STC mechanism
Synchronize: resolve CRI signaling table and obtain PCR information, the system clock that correction is local, utilize in media data simultaneously
The other PTS information of frame level knows that decoder decodes；If being in networking state, then ignore PCR Yu the PTS information in data,
Network Time Protocol is used to carry out clock synchronization: receiving terminal utilizes NTP to service regular calibration local clock, utilizes in Media Stream
Timeline administrative mechanism guide decoder decoding.
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| CN113497701A (en) * | 2020-03-19 | 2021-10-12 | 迈络思科技有限公司 | Phase detector command propagation between channels in MCM USR SERDES |
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