CN103442259B - Method and device for reconstructing media data - Google Patents
Method and device for reconstructing media data Download PDFInfo
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- CN103442259B CN103442259B CN201310367305.1A CN201310367305A CN103442259B CN 103442259 B CN103442259 B CN 103442259B CN 201310367305 A CN201310367305 A CN 201310367305A CN 103442259 B CN103442259 B CN 103442259B
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Abstract
The invention discloses a method and device for reconstructing media data. The method comprises the step of de-multiplexing a transport stream of a program to obtain original media data including video data of the program, the step of resetting a PCR in the original media data according to a local clock, the step of slicing the original media data with the reset PCR according to the method of regarding an I frame of the video data as an initial frame of the video data of slices, the step of setting index messages for all slices, and the step of regarding the slices on which the index messages are set as reconstructed data of the program to be stored. The method and device for reconstructing the media data solve the problem that due to the fact that the requirements for streaming media initial data formats of operating systems of different client terminals are different, streaming media cannot be played normally, and the performance of the service of directly playing the streaming media among the client terminals is promoted.
Description
Technical field
The present invention relates to the communications field, in particular it relates to a kind of recombination method of media data and device.
Background technology
In MPEG (Moving Picture Experts Group, dynamic image expert group) standard, coding/decoding apparatus
When processing TS (Transport Stream, transport stream can be also simply referred to as TS stream), there is a basic time reference, this
Individual time reference is exactly PCR (Program Clock Reference, Program Clock Reference).In general, PCR is in coding side
Produce, need accurately to be transferred to decoding end, use for decoding.PCR is for video, the quality of audio frequency and mutual time delay very
Crucial.But TS flows in transmitting procedure, often through the process of primary equipment, due to correlation between code check and TS bag
Change, all can be to the shake of PCR and interval producing ratio large effect, thus affecting the normal decoder of terminal.
Streaming Media, during transmission, is to be transmitted in the form of each frame, including：I frame (image), P
Frame or B frame；Wherein, I frame is intracoded frame, and it is to carry out compressed transmission data amount by being eliminated as much as image space redundancy
In-frame encoding picture；P frame is forward prediction coded image, its pass through abundant reduce in image sequence above encoded frame when
Between redundancy carry out the coded image of compressed transmission data amount, be also prediction frame；B frame is bidirectionally predictive coded picture, and it was both examined
Consider with sequence of source images before encoded frame, also take after sequence of source images the time redundancy information between encoded frame into account to press
The coded image of contracting transmitted data amount, is also bi-directional predicted frames；Usually, I frame compression efficiency is minimum, and P frame is higher, B frame highest.
When server end starts to receive program data, first receiving frame of video is probably any kind number in above-mentioned three class frames
According to.The transmission schematic diagram of frame of video as shown in Figure 1, wherein, each frame is because the various process operations in transmitting procedure, its position
Put it may happen that changing, as illustrated by the arrows in fig. 1.
In traditional Streaming Media scheme, client needs to enter according to specific media processing software and streaming media server end
Row communication, just can complete the function of streaming media playing；And in a lot of practical application, especially with smart mobile phone as client
When, often due to the difference of operating system and platform, installing client software becomes inadvisable.
The initial data call format of the operating system streaming media of different clients is different；As Android (peace
Tall and erect), the operating system such as iOS (Internet operating system), windows phone, wherein, iOS system requires the initial number of Streaming Media
Must be I frame according to frame.
The Streaming Media causing for the initial data call format difference of the operating system streaming media of different clients
Cannot normal play problem, effective solution is not yet proposed at present.
Content of the invention
The purpose of the embodiment of the present invention is to provide a kind of recombination method of media data and device, different in order to solve
The Streaming Media that the initial data call format difference of the operating system streaming media of client causes cannot normal play problem.
A kind of one side according to embodiments of the present invention, there is provided recombination method of media data, including：Biography to program
Defeated stream is demultiplexed, and obtains the original media data of program；Wherein, original media data includes：Video data；According to local
Clock resets to the PCR in original media data；According to using the I frame in video data as section in video data rise
The mode of beginning frame, cuts into slices to the original media data resetting after PCR；For each section setting index information；Rope will be set
Section after fuse breath is as the recombination data storage of program；
Wherein, when cutting into slices to the described original media data after resetting described PCR, examine every a chronomere
Look into whether current video frame is I frame, if I frame, then cut into slices；Otherwise cut into slices again until I frame, so that each section is initial
Frame is I frame.
Preferably, the above-mentioned transport stream to program carries out demultiplexing inclusion：Obtain the transport stream of program；Abided by according to transport stream
The transmission specification agreement followed demultiplexes to this transport stream.
Preferably, above-mentioned according to using the I frame in video data as section in video data start frame mode, counterweight
Put the original media data after PCR and carry out section inclusion：Search the video data in original media data；By the video finding
First I frame in data and the data after first I frame are defined as valid data；According to the chronomere setting to effective
Data is cut into slices, and makes the video data in each section all using I frame as start frame, and the media number of former and later two sections
According to continuous.
Preferably, above-mentioned for each section setting index information include：Set according to the broadcast format that web browser is supported
Put the index information of each section.
Preferably, said method also includes：Receiving terminal is asked to the acquisition of program；Whether checking terminal is legal；If
It is that the recombination data of program is sent to terminal.
A kind of another aspect according to embodiments of the present invention, there is provided reconstruction unit of media data, including：Demultiplexing mould
Block, for demultiplexing to the transport stream of program, obtains the original media data of program；Wherein, original media data includes：
Video data；Reference clock resets module, for original media number demultiplexing module demultiplexing being obtained according to local clock
According in PCR reset；Data slicer module, for according to using I frame in video data as video data in section
The mode of start frame, the original media data that reference clock is reset after module reset PCR is cut into slices；Index setup module,
For each the section setting index information obtaining for data slicer module；Data memory module, for indexing setup module
Section after setting index information is as the recombination data storage of program；
Wherein, when cutting into slices to the described original media data after resetting described PCR, examine every a chronomere
Look into whether current video frame is I frame, if I frame, then cut into slices；Otherwise cut into slices again until I frame, so that each section is initial
Frame is I frame.
Preferably, above-mentioned demultiplexing module includes：Transport stream acquiring unit, for obtaining the transport stream of program；Demultiplexing
Unit, for demultiplexing to above-mentioned transport stream according to the transmission specification agreement that the transport stream that transport stream acquiring unit obtains is followed
With.
Preferably, above-mentioned data slicer module includes：Video data searching unit, for searching in original media data
Video data；Valid data determining unit, for first I frame in the video data that finds video data searching unit
And the data after first I frame is defined as valid data；Section unit, for the chronomere according to setting to valid data
The valid data that determining unit determines are cut into slices, and make the video data in each section all using I frame as start frame and front
The media data of latter two section is continuous.
Preferably, above-mentioned index setup module includes：Index arranging unit, for the broadcasting supported according to web browser
Form arranges the index information of each section that data slicer module obtains.
Preferably, said apparatus also include：Request receiving module, asks to the acquisition of program for receiving terminal；Checking
Module, whether legal for verifying terminal；Data transmission blocks, if the result for authentication module is yes, by data
The recombination data of the program of memory module storage is sent to terminal.
The embodiment of the present invention is by being recombinated to transport stream it is ensured that the start frame of video data is in each section
I frame, is easy to different operating system and it is parsed, and, is adopted as the mode of each section setting index information meanwhile, makes reception
Can be resequenced it is ensured that the normal play of program to the section after out of order according to this index information in end, therefore solve
The Streaming Media that the initial data call format difference of the operating system streaming media of different clients causes cannot normally be broadcast
The problem put, improves the performance realizing live streaming media service between multi-client.
Brief description
The accompanying drawing constituting the part of the application is used for providing a further understanding of the present invention, the schematic reality of the present invention
Apply example and its illustrate, for explaining the present invention, not constituting inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the transmission schematic diagram of the frame of video that correlation technique provides；
Fig. 2 is the flow chart of the recombination method of media data provided in an embodiment of the present invention；
Fig. 3 is the structured flowchart of the reconstruction unit of media data provided in an embodiment of the present invention；
Fig. 4 is the schematic diagram of air medium server restructuring TS stream provided in an embodiment of the present invention.
Specific embodiment
To describe the present invention in detail below with reference to accompanying drawing and in conjunction with the embodiments.It should be noted that not conflicting
In the case of, the embodiment in the application and the feature in embodiment can be mutually combined.
In view of the diversity of terminal operating system, in order to lift the scope of application of Media Stream, the embodiment of the present invention provides
A kind of recombination method of media data and device.It is described in detail below by embodiment.
The recombination method flow chart of media data shown in Figure 2, the method comprises the following steps：
Step S202, the transport stream (i.e. TS stream) to program demultiplexes, and obtains the original media data of program；Its
In, this original media data includes：Video data；In addition, this original media data also includes voice data and other data；
Step S204, resets to the PCR in original media data according to local clock；For example：Original media data
In PCR numerical value delete, according to local clock again be original media data in PCR setting numerical value；
Step S206, according to using the mode of the start frame of video data as in cut into slices of the I frame in video data, to replacement
Original media data after PCR is cut into slices；
This slicing mode will be possible to ensure that in each section, the start frame of video data is I frame, so no matter terminal
Which kind of the operating system that equipment is supported is, all this section can be parsed；
Step S208, for each section setting index information；This index information can be each section title it is also possible to
It is sequence number etc.；
Step S210, the section after setting index information is stored as the recombination data of program.
The method of the present embodiment by transport stream is recombinated it is ensured that each section in video data start frame equal
For I frame, it is easy to different operating system and it is parsed, be adopted as the mode of each section setting index information meanwhile, make to connect
Receiving end can be resequenced it is ensured that the normal play of program to the section after out of order according to this index information, therefore solves
The Streaming Media that the initial data call format difference of the operating system streaming media of different clients of having determined causes cannot be normal
The problem play, improves the performance realizing live streaming media service between multi-client.
Said method can be applied on an independent server, and this server can be a portable equipment, its collection
Become to have receiver module, and secondary encapsulation can be carried out to the data receiving, to meet the broadcasting of the clients such as iOS or Andorid,
This client can be the terminal devices such as mobile phone or ipad.
Transmission specification agreement (for example, iOS13818 specification) to be met in view of the TS stream on network.Therefore, above-mentioned service
Device may be referred to this specification protocol and data demultiplexed.Based on this, the above-mentioned transport stream to program carries out demultiplexing and includes：
Obtain the transport stream of program；According to the transmission specification agreement that this transport stream is followed, transport stream is demultiplexed.Wherein, program
Transport stream can be by integrated ISDB-Tmm (the Integrated Services Digital of server end
Broadcasting-Terrestrial Mobile Multimedia, Integrated Services Digital Broadcasting-ground moving media) or its
Its mobile TV standard receiving device obtains.
In order that each operating system all can parse Streaming Media, video counts in each section after embodiment of the present invention restructuring
According to start frame be the I frame of video data.Based on this, above-mentioned according to using the I frame in video data as section in video counts
According to start frame mode, to reset PCR after original media data carry out section include：Search regarding in original media data
Frequency evidence；First I frame in the video data finding and the data after first I frame are defined as valid data；Press
According to the chronomere (for example, 5 seconds) setting, valid data are cut into slices, and make the video data in each section all with I frame
As start frame, and the media data of former and later two sections is continuous.It is invalid which is considered as the data before first I frame
Data, directly abandons.When cutting into slices to valid data according to the chronomere setting, it is not every a chronomere
Just cut into slices once, but check whether current video frame is I frame, if I frame, then cuts into slices every a chronomere；Otherwise
Need to cut into slices again until I frame, I frame is with the start frame ensureing each section.
In order to reduce the configuration requirement of receiving device (i.e. terminal), the embodiment of the present invention can optimum combination side further
Formula, even if the data after restructuring can be parsed by web browser, based on this, above-mentioned section for each arranges index information bag
Include：According to web browser support broadcast format (for example：The M3U playlist form of extension, that is, extend entitled M3u8 and play
List) arrange each section index information.Under this mode, terminal is accomplished by supporting that web browser function can achieve section
Purpose is play.
According to said method, when implementing, above-mentioned server can be analyzed to the data after demultiplexing, with I
Frame is as the beginning of valid data, and now resets PCR with server end state.Then pressing 5 seconds about is a chronomere,
For multiple files it is ensured that the video data of each section is all started with I frame, and the content between respectively cutting into slices is even for segmentation section
Continuous；File of cutting into slices is indexed by the M3U playlist form reusing extension, and is stored in web browsing server (web
Server in), for terminal downloads.
In view of program copyright the problems such as, the embodiment of the present invention can also authorize to terminal, only the end of mandate
End just can get the program after restructuring from server, completes normally to play, based on this, said method also includes：Connect
Receive the acquisition request of terminal-pair program；Verify whether this terminal is legal；If it is, the recombination data of program is sent to this end
End.Wherein, verify whether this terminal is legal, can be using the authorization code verification mode in correlation technique, it would however also be possible to employ other
Verification mode, the embodiment of the present invention is not defined to this.
Corresponding to said method, the embodiment of the present invention additionally provides a kind of reconstruction unit of media data, referring to Fig. 3 institute
Show, this device is included with lower module：
Demultiplexing module 32, for demultiplexing to the transport stream of program, obtains the original media data of program；Its
In, original media data includes：Video data；
Reference clock resets module 34, for original media demultiplexing module 32 demultiplexing being obtained according to local clock
Program Clock Reference PCR in data is reset；
Data slicer module 36, for according to using I frame in video data as video data in section start frame
Mode, resets the original media data after module 34 replacement PCR and cuts into slices to reference clock；
Index setup module 38, for each the section setting index information obtaining for data slicer module 36；
Data memory module 40, for arranging the section after index information as the restructuring of program using index setup module 38
Data storage.
The device of the present embodiment by transport stream is recombinated it is ensured that each section in video data start frame equal
For I frame, it is easy to different operating system and it is parsed, be adopted as the mode of each section setting index information meanwhile, make to connect
Receiving end can be resequenced it is ensured that the normal play of program to the section after out of order according to this index information, therefore solves
The Streaming Media that the initial data call format difference of the operating system streaming media of different clients of having determined causes cannot be normal
The problem play, improves the performance realizing live streaming media service between multi-client.
Preferably, above-mentioned demultiplexing module 32 includes：Transport stream acquiring unit, for obtaining the transport stream of program；Demultiplex
With unit, for being solved to above-mentioned transport stream according to the transmission specification agreement that the transport stream that transport stream acquiring unit obtains is followed
Multiplexing.
Above-mentioned data slicer module 36 can include：Video data searching unit, for searching in original media data
Video data；Valid data determining unit, for first I frame in the video data that finds video data searching unit
And the data after first I frame is defined as valid data；Section unit, for the chronomere according to setting to valid data
The valid data that determining unit determines are cut into slices, and make the video data in each section all using I frame as start frame and front
The media data of latter two section is continuous.
Index setup module 38 includes：Index arranging unit, for the broadcast format setting supported according to web browser
The index information of each section that data slicer module obtains.
In order to safeguard the copyright of program, said apparatus also include：Request receiving module, obtains to program for receiving terminal
Take request；Authentication module, whether legal for verifying terminal；Data transmission blocks, if the result for authentication module
It is yes, the recombination data of the program that data memory module is stored is sent to terminal.
Said apparatus can be arranged in above-mentioned server.
Such scheme can apply to HLS, and (Http Live Streaming is a kind of complete base that Apple realizes
Media stream protocol in HTTP) in playing process.
The schematic diagram of air medium server restructuring TS stream as shown in Figure 4, wherein, program data source (i.e. transmitting terminal) is sent out
TS is sent to flow, air medium server receives this TS stream by ISDB-TMM, obtains original media data after demultiplexing, should
Video data in data includes B, P, I frame shown in figure, and according to above-mentioned recombination form, air medium server discards no
Effect data, resets to the PCR in frame, and is a section with 5 seconds contents, and each cut into slices in video data start frame
For I frame.Finally obtain TS data slicer, use for the terminal plays such as terminal 1 (iOS) and terminal 2 (Android operation system).Terminal
It can be the intelligent terminal only supporting HTML (Hyper Text Markup Language, HTML) 5
(Android, iOS and other intelligent operating system), realizes terminal live wireless flow media server end according to the method described above and obtains
The program data got.
According to above-described embodiment, such scheme is simply effective, and client does not need to install special media play soft
Part, directly uses HTML5 browser just to can achieve program broadcasting, the secondary development of client and favorable expandability.
Obviously, those skilled in the art should be understood that each module of the above-mentioned present invention or each step can be with general
Computing device realizing, they can concentrate on single computing device, or be distributed in multiple computing devices and formed
Network on, alternatively, they can be realized with the executable program code of computing device, it is thus possible to they are stored
To be executed by computing device in the storage device, and in some cases, can be with different from shown in order execution herein
The step going out or describing, or they are fabricated to respectively each integrated circuit modules, or by the multiple modules in them or
Step is fabricated to single integrated circuit module to realize.So, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (8)
1. a kind of recombination method of media data is it is characterised in that include：
The transport stream of program is demultiplexed, obtains the original media data of described program；Wherein, described original media data
Including：Video data；
According to local clock, the Program Clock Reference PCR in described original media data is reset；
According to using the mode of the start frame of video data as in cut into slices of the I frame in described video data, after the described PCR of replacement
Described original media data cut into slices；
For each section setting index information；
Will the recombination data storage as described program for the section after described index information be set；
Wherein, when cutting into slices to the described original media data after resetting described PCR, check every a chronomere and work as
Whether front frame of video is I frame, if I frame, then cuts into slices；Otherwise cut into slices again until I frame, so that the start frame of each section is equal
For I frame.
2. method according to claim 1 is it is characterised in that the described transport stream to program carries out demultiplexing inclusion：
Obtain the transport stream of program；
According to the transmission specification agreement that described transport stream is followed, described transport stream is demultiplexed.
3. method according to claim 1 is it is characterised in that described include for each section setting index information：
The index information of each section is set according to the broadcast format that web browser is supported.
4. according to the method in any one of claims 1 to 3 it is characterised in that methods described also includes：
Receiving terminal is asked to the acquisition of described program；
Verify whether described terminal is legal；
If it is, the recombination data of described program is sent to described terminal.
5. a kind of reconstruction unit of media data is it is characterised in that include：
Demultiplexing module, for demultiplexing to the transport stream of program, obtains the original media data of described program；Wherein,
Described original media data includes：Video data；
Reference clock resets module, for the described original media described demultiplexing module demultiplexing being obtained according to local clock
Program Clock Reference PCR in data is reset；
Data slicer module, for according to using the I frame in described video data as section in video data start frame side
Formula, the described original media data that described reference clock is reset after PCR described in module reset is cut into slices；
Index setup module, for each the section setting index information obtaining for described data slicer module；
Data memory module, for arranging the section after described index information as described program using described index setup module
Recombination data stores；
Wherein, when cutting into slices to the described original media data after resetting described PCR, check every a chronomere and work as
Whether front frame of video is I frame, if I frame, then cuts into slices；Otherwise cut into slices again until I frame, so that the start frame of each section is equal
For I frame.
6. device according to claim 5 is it is characterised in that described demultiplexing module includes：
Transport stream acquiring unit, for obtaining the transport stream of program；
Demultiplexing unit, for the transmission specification agreement pair followed according to the described transport stream that described transport stream acquiring unit obtains
Described transport stream is demultiplexed.
7. device according to claim 5 is it is characterised in that described index setup module includes：
Index arranging unit, it is every that the described data slicer module of broadcast format setting for supporting according to web browser obtains
The index information of individual section.
8. the device according to any one of claim 5 to 7 is it is characterised in that described device also includes：
Request receiving module, asks to the acquisition of described program for receiving terminal；
Authentication module, whether legal for verifying described terminal；
Data transmission blocks, if the result for described authentication module is yes, by the storage of described data memory module
The recombination data of described program is sent to described terminal.
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| CN201310367305.1A CN103442259B (en) | 2013-08-21 | 2013-08-21 | Method and device for reconstructing media data |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103648021B (en) * | 2013-12-24 | 2017-08-29 | 深圳国微技术有限公司 | The method that network video file is played from USB storage device |
| CN103929655B (en) * | 2014-04-25 | 2017-06-06 | 网易传媒科技（北京）有限公司 | The method and apparatus that transcoding treatment is carried out to audio-video document |
| CN105282627B (en) * | 2014-07-22 | 2019-09-10 | 南京中兴新软件有限责任公司 | A kind of method and server obtaining live video slice |
| CN105025308B (en) * | 2015-08-10 | 2019-03-19 | 北京中科大洋科技发展股份有限公司 | A kind of IP stream recording method based on fragment file |
| WO2017035802A1 (en) * | 2015-09-02 | 2017-03-09 | 深圳好视网络科技有限公司 | Method and apparatus for encoding and playing a transport stream |
| CN109688424A (en) * | 2018-12-29 | 2019-04-26 | 深圳中移视讯技术有限公司 | Video/audio data transmission method, law enforcement acquisition workstation and readable storage medium storing program for executing |
| CN109788372B (en) * | 2019-01-24 | 2021-06-08 | 维沃移动通信有限公司 | Streaming media playing method and related device |
| CN111770390B (en) * | 2020-07-09 | 2024-02-09 | 腾讯科技（深圳）有限公司 | Data processing method, device, server and storage medium |
| CN114189752A (en) * | 2021-11-25 | 2022-03-15 | 杭州视在数科信息技术有限公司 | Video storage scheme based on object storage service |
| CN115550746B (en) * | 2022-10-11 | 2024-09-10 | 杭州视洞科技有限公司 | HLS low-delay method based on network camera |
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| CN100556114C (en) * | 2006-11-23 | 2009-10-28 | 中兴通讯股份有限公司 | A kind of method of media slicing storage |
| CN1997162B (en) * | 2006-12-25 | 2010-10-27 | 华为技术有限公司 | PCR correction method and device |
| CN101635848B (en) * | 2008-07-22 | 2013-08-07 | 北大方正集团有限公司 | Method and device for editing video file |
| CN101917388A (en) * | 2009-12-17 | 2010-12-15 | 新奥特（北京）视频技术有限公司 | Streaming media data storage method and device |
| CN102611945B (en) * | 2011-12-19 | 2014-06-04 | 北京蓝汛通信技术有限责任公司 | Streaming media slicing method, slicing server and streaming media demand system |
| CN102932670B (en) * | 2012-11-29 | 2015-09-02 | 百视通网络电视技术发展有限责任公司 | A kind of Streaming Media dicing method and system |
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