CN104394474B - Streaming Media quickly positions order method - Google Patents

Streaming Media quickly positions order method Download PDF

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Publication number
CN104394474B
CN104394474B CN201410682407.7A CN201410682407A CN104394474B CN 104394474 B CN104394474 B CN 104394474B CN 201410682407 A CN201410682407 A CN 201410682407A CN 104394474 B CN104394474 B CN 104394474B
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byte
judge whether
backward
sync
information
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CN104394474A (en
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魏刚
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SUZHOU AEROSPACE SYSTEM ENGINEERING Co Ltd
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SUZHOU AEROSPACE SYSTEM ENGINEERING Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47—End-user applications
    • H04N21/472—End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content
    • H04N21/47202—End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content for requesting content on demand, e.g. video on demand
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47—End-user applications
    • H04N21/472—End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content
    • H04N21/47217—End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content for controlling playback functions for recorded or on-demand content, e.g. using progress bars, mode or play-point indicators or bookmarks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
    • H04N21/85—Assembly of content; Generation of multimedia applications
    • H04N21/854—Content authoring
    • H04N21/8547—Content authoring involving timestamps for synchronizing content

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Databases & Information Systems (AREA)
  • Human Computer Interaction (AREA)
  • Computer Security & Cryptography (AREA)
  • Information Retrieval, Db Structures And Fs Structures Therefor (AREA)

Abstract

Order method is quickly positioned the invention discloses a kind of Streaming Media, the ratio of total duration is accounted for according to program request time point, position of the program request position in whole video file is extrapolated, then as datum mark, the sync id information of two-way search video package backward, realizes quick positioning forward.The present invention is without decoding video content；Without since file section start, being stabbed by the reduced time one by one, synchronizing positioning；According to Principle of Statistics, direct express delivery navigates to program request position, and positioning is quick, accurately.

Description

Streaming Media quickly positions order method
Technical field
Transmitted the present invention relates to multimedia package, quick positioning with synchronous, fluidisation and the technical field such as program request, specifically and Speech, is related to a kind of Streaming Media and quickly positions order method.
Background technology
The video and audio information data amount loaded due to multimedia file is very huge, if not using interframe encode skill Art eliminates time redundancy information, will take very big disk space；Such file is both unfavorable for storing or be unfavorable for pass It is defeated.Therefore in order to reduce memory space and network transmission the need for, existing multimedia file substantially using interframe compression compile Code technology, the compression of multimedia video frequency file is completed by eliminating the redundancy between multi-frame video.Due to the P in addition to I frames Frame, B frame recordings are different informations with I frames, so the reconstruction of these frames is necessarily dependent upon I frames.Simultaneously different frames, record Different information it is often different, therefore differed greatly per the size of data of frame.If existing streaming program request technology will be in file In some time point start order video and be accomplished by the synchronous lookup since top of file, until finding what is required close to user Just start transmission during I frames to play.Such program request technology has that the response time is long, action excessively slow defect, Yong Hutong Crossing nexus sowing time control action usually could for a long time obtain the response of system, experience sense close friend hard to say.
Video is played if putting broadcasting user and expecting to click on from some time point of video file, existing streaming program request technology, Synchronized timestamp will be begun look for from the head of whole video file, timestamp is encapsulated in RTP header, that is, needs first to decode, then It is synchronous.Therefore inevitably there is precise positioning time-consuming many, the deficiency such as positioning is inaccurate, Consumer's Experience effect difference.
The content of the invention
It is an object of the invention to the problem above for overcoming prior art presence, there is provided a kind of stream based on Principle of Statistics Media quickly position order method, realize during streaming media on demand be accurately positioned with quick program request, make user in nexus Sowing time can obtain the effect as playing local multimedia file.
To realize above-mentioned technical purpose and the technique effect, the present invention is achieved through the following technical solutions：
A kind of Streaming Media quickly positions order method, and the ratio of total duration is accounted for according to program request time point, extrapolates program request position The position in whole video file is put, prediction equation is
,
In formula, Position represents the position of program request time point corresponding video file, and its unit is byte,
FileLength represents the length of video file, and its unit is byte,
t1The time point of user's program request is represented,
T represents the total duration of video file；
Then as datum mark, the sync id information of two-way search video package backward, realizes quick positioning forward；
Look-ahead includes reading video file content along video playback direction byte-by-byte, finds first continuous four Byte content is the data of sync id information, if finding, and records the position of Look-ahead video file, and forward direction searches knot Beam, otherwise, forward direction, which is searched, is not present sync id information；
Searching backward includes reading video file content along video file prime direction byte-by-byte, finds first continuously Four byte contents are the data of sync id information, if finding, and record the position for searching video file backward, look into backward End is looked for, otherwise, sync id information is not present in backward search.
Further, the Look-ahead comprises the following steps,
Step 1）Judge whether position+1 is more than length, a byte is otherwise read forward, byte1 is designated as, is then Look-ahead is not present in sync id information, formula, and position represents the position of program request time point corresponding video file, single Position is byte, and length represents the byte number of whole file；
Step 2）Position=position+1, and judge whether byte1 is 0xF1, it is then to enter next step, otherwise Return to step 1；
Step 3）Judge whether position+1 is more than length, a byte is otherwise read forward, byte2 is designated as, is then Sync id information is not present in Look-ahead；
Step 4）Position=position+1, and judge whether byte2 is 0xF2, it is then to enter next step, otherwise Whether be 0xF1, byte2 is 0xF1 return to step 3, and byte2 is not 0xF1 return to step 1 if judging byte2；
Step 5）Judge whether position+1 is more than length, a byte is otherwise read forward, byte3 is designated as, is then Sync id information is not present in Look-ahead；
Step 6）Position=position+1, and judge whether byte3 is 0xF3, it is then to enter next step, it is no Whether be 0xF1, byte3 is 0xF1 return to step 3, and byte3 is not 0xF1 return to step 1 if then judging byte3；
Step 7）Judge whether position+1 is more than length, a byte is otherwise read forward, byte4 is designated as, is then Sync id information is not present in Look-ahead；
Step 8）Position=position+1, and judge whether byte4 is 0xF4, it is then to complete to search, otherwise sentences Whether disconnected byte4 is 0xF1, and byte4 is 0xF1 return to step 3, and byte4 is not 0xF1 return to step 1.
Further, described search backward comprises the following steps,
Step 1）Judge whether position-1 is less than length, a byte is otherwise read backward, byte1 is designated as, is then Search and be not present in sync id information, formula backward, position represents the position of program request time point corresponding video file, with Byte is unit, and length represents the start byte of file；
Step 2）Position=position-1, and judge whether byte1 is 0xF4, it is then to enter next step, otherwise Return to step 1；
Step 3）Judge whether position-1 is less than length, a byte is otherwise read backward, byte2 is designated as, is then Search backward and sync id information is not present；
Step 4）Position=position-1, and judge whether byte2 is 0xF3, it is then to enter next step, otherwise Whether be 0xF4, byte2 is 0xF4 return to step 3, and byte2 is not 0xF4 return to step 1 if judging byte2；
Step 5）Judge whether position-1 is less than length, a byte is otherwise read backward, byte3 is designated as, is then Search backward and sync id information is not present；
Step 6）Position=position-1, and judge whether byte3 is 0xF2, it is then to enter next step, otherwise sentences Whether disconnected byte3 is 0xF4, and byte3 is 0xF4 return to step 3, and byte3 is not 0xF4 return to step 1；
Step 7）Judge whether position-1 is less than length, a byte is otherwise read backward, byte4 is designated as, is then Search backward and sync id information is not present；
Step 8）Position=position-1, and judge whether byte4 is 0xF1, it is then to complete to search, otherwise sentences Whether disconnected byte4 is 0xF4, and byte4 is 0xF4 return to step 3, and byte4 is not 0xF4 return to step 1.
The beneficial effects of the invention are as follows:
The present invention is without decoding video content；Without since file section start, being stabbed by the reduced time one by one, carry out same Step positioning；According to Principle of Statistics, direct express delivery navigates to program request position, and positioning is quick, accurately.
Described above is only the general introduction of technical solution of the present invention, in order to better understand the technological means of the present invention, And can be practiced according to the content of specification, below with presently preferred embodiments of the present invention and coordinate accompanying drawing describe in detail as after. The embodiment of the present invention is shown in detail by following examples and its accompanying drawing.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this hair Bright schematic description and description is used to explain the present invention, does not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is video data package package head format figure；
Fig. 2 is Look-ahead flow chart；
Fig. 3 is to search flow chart backward.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, the present invention is described in detail.
First, video data package principle
1st, video data package packet header
The data being encapsulated into packet header have synchronizing information, loadtype, SDK supplies producer, SDK versions, timestamp, package Sequence number, load data length.Shown in specific package head format reference picture 1.
Specific example setting：
Synchronizing information:0xF1F2F3F4
Loadtype：
0：System head
1：Bit stream data
2nd, the quick positioning principle of Streaming Media
In a network, the size of files in stream media is presented to user in the form of duration.Obtained by substantial amounts of statistical test Go out, the length of the video file of streaming media playing（Byte）With the duration of video（s）Between it is linear.
The ratio of total duration is accounted for according to program request time point, position of the program request position in whole video file is extrapolated, pushes away Calculating formula is
,
In formula, Position represents the position of program request time point corresponding video file, and its unit is byte,
FileLength represents the length of video file, and its unit is byte,
t1The time point of user's program request is represented,
T represents the total duration of video file；
Then as datum mark, the sync id information of two-way search video package backward, realizes quick positioning forward.
3rd, two-way search synchronous mark flow
1. before to search principle
During video data package, synchronous mark information is 0XF1F2F3F4.The point on the basis of quickly navigating to program request position, The principle that forward direction searches synchronous mark is to read video file content along video playback direction byte-by-byte, finds first company The data that continuous four byte contents are 0xF1F2F3F4.If finding, bForwardFind=True, and record ForwardPosition, forward direction, which is searched, to be terminated.Otherwise, bForwardFind=False, forward direction, which is searched, is not present synchronous mark Information.
Shown in reference picture 2, the Look-ahead comprises the following steps,
Step 1）Judge whether position+1 is more than length, a byte is otherwise read forward, byte1 is designated as, is then Look-ahead is not present in sync id information, formula, and position represents the position of program request time point corresponding video file, single Position is byte, and length represents the byte number of whole file；
Step 2）Position=position+1, and judge whether byte1 is 0xF1, it is then to enter next step, otherwise returns Return step 1；
Step 3）Judge whether position+1 is more than length, a byte is otherwise read forward, byte2 is designated as, is then Sync id information is not present in Look-ahead；
Step 4）Position=position+1, and judge whether byte2 is 0xF2, it is then to enter next step, otherwise sentences Whether disconnected byte2 is 0xF1, and byte2 is 0xF1 return to step 3, and byte2 is not 0xF1 return to step 1；
Step 5）Judge whether position+1 is more than length, a byte is otherwise read forward, byte3 is designated as, is then Sync id information is not present in Look-ahead；
Step 6）Position=position+1, and judge whether byte3 is 0xF3, it is then to enter next step, otherwise sentences Whether disconnected byte3 is 0xF1, and byte3 is 0xF1 return to step 3, and byte3 is not 0xF1 return to step 1；
Step 7）Judge whether position+1 is more than length, a byte is otherwise read forward, byte4 is designated as, is then Sync id information is not present in Look-ahead；
Step 8）Position=position+1, and judge whether byte4 is 0xF4, it is then to complete to search, otherwise judges Whether byte4 is 0xF1, and byte4 is 0xF1 return to step 3, and byte4 is not 0xF1 return to step 1.
2. after to search principle
The point on the basis of quickly navigating to program request position, the backward principle for searching synchronous mark is to be originated along video file Direction byte-by-byte reads video file content, finds the data that first continuous four byte content is 0xF4F3F2F1.If Find, then bBackFind=True, and record BackPosition, backward search is terminated.Otherwise, bBackFind= Synchronous mark information is not present in False, backward search.
Shown in reference picture 3, described search backward comprises the following steps,
Step 1）Judge whether position-1 is less than length, a byte is otherwise read backward, byte1 is designated as, is then Search and be not present in sync id information, formula backward, position represents the position of program request time point corresponding video file, with Byte is unit, and length represents the original position of video file；
Step 2）Position=position-1, and judge whether byte1 is 0xF4, it is then to enter next step, otherwise returns Return step 1；
Step 3）Judge whether position-1 is less than length, a byte is otherwise read backward, byte2 is designated as, is then Search backward and sync id information is not present；
Step 4）Position=position-1, and judge whether byte2 is 0xF3, it is then to enter next step, otherwise sentences Whether disconnected byte2 is 0xF4, and byte2 is 0xF4 return to step 3, and byte2 is not 0xF4 return to step 1；
Step 5）Judge whether position-1 is less than length, a byte is otherwise read backward, byte3 is designated as, is then Search backward and sync id information is not present；
Step 6）Position=position-1, and judge whether byte3 is 0xF2, it is then to enter next step, otherwise sentences Whether disconnected byte3 is 0xF4, and byte3 is 0xF4 return to step 3, and byte3 is not 0xF4 return to step 1；
Step 7）Judge whether position-1 is less than length, a byte is otherwise read backward, byte4 is designated as, is then Search backward and sync id information is not present；
Step 8）Position=position-1, and judge whether byte4 is 0xF1, it is then to complete to search, otherwise judges Whether byte4 is 0xF4, and byte4 is 0xF4 return to step 3, and byte4 is not 0xF4 return to step 1.
4th, Streaming Media quickly positions program request flow
The first step：User's program request time point corresponding video file position is quickly positioned according to Principle of Statistics Position。
Second step：The point on the basis of Position, forward two-way search audio video synchronization flag information backward.
3rd step：By the timestamp comparation at the timestamp at forward, backward position and Position, it is determined that final accurate The position of broadcasting.
4th step：If data type is bit stream data, a system head is read, is commenced play out, otherwise directly played.
Wherein, Streaming Media quickly position that program request flow second step is related to two-way search audio video synchronization mark is believed backward forward , there are three kinds of situations in breath,
Situation 1：BForwardFind=True, bBackFind=False, i.e., it is preceding to there is synchronous mark to lookup, after To in the absence of now accurate play position is ForwardPosition.Such a situation generally corresponds to program request position and originated in file Position.
Situation 2：BForwardFind=False, bBackFind=True, even if there is synchronous mark in backward search, Forward direction is not present, and now accurate play position is BackPosition.Such a situation generally corresponds to knot of the program request position in file Beam position.
Situation 3：BForwardFind=True, bBackFind=True, i.e., it is preceding to exist to lookup and backward lookup Synchronous mark.Such a situation generally corresponds to program request position in the centre of video file.Now take out Position, At tri- positions of ForwardPosition, BackPosition, the timestamp in video package packet header、、.Perform the 3rd Step.
Wherein Streaming Media quickly positions the timestamp contrast that the step of program request flow the 3rd is related to, and specific process is：
CompareWithSize.
Take ForwardPo Sition is accurate play position.Otherwise, it is accurate play position to take BackPosition.
With Upper described only the preferred embodiments of the present invention, are not intended to limit the invention, for those skilled in the art, The present invention can have various modifications and variations.Within the spirit and principles of the invention, any modification for being made, equally replace Change, improve, should be included in the scope of the protection.

Claims (3)

1. a kind of Streaming Media quickly positions order method, it is characterised in that：The ratio of total duration is accounted for according to program request time point, is calculated Go out position of the program request position in whole video file, prediction equation is
,
In formula, Position represents the position of program request time point corresponding video file, and its unit is byte,
FileLength represents the length of video file, and its unit is byte,
t1The time point of user's program request is represented,
T represents the total duration of video file；
Then as datum mark, the sync id information of two-way search video package backward, realizes quick positioning forward；
Look-ahead includes reading video file content along video playback direction byte-by-byte, finds first continuous four byte Content is the data of sync id information, if finding, and records the position of Look-ahead video file, and forward direction, which is searched, to be terminated, Otherwise, forward direction, which is searched, is not present sync id information；
Searching backward includes reading video file content along video file prime direction byte-by-byte, finds first continuous four Byte content is the data of sync id information, if finding, and records the position for searching video file backward, backward to search knot Sync id information is not present in beam, otherwise, backward search.
2. Streaming Media according to claim 1 quickly positions order method, it is characterised in that：The Look-ahead include with Lower step,
Step 1）Judge whether position+1 is more than length, a byte is otherwise read forward, byte1 is designated as, be then forward Search and be not present in sync id information, formula, position represents the position of program request time point corresponding video file, and unit is Byte, length represents the byte number of whole file；
Step 2）Position=position+1, and judge whether byte1 is 0xF1, it is then to enter next step, otherwise returns Step 1；
Step 3）Judge whether position+1 is more than length, a byte is otherwise read forward, byte2 is designated as, be then forward Search and sync id information is not present；
Step 4）Position=position+1, and judge whether byte2 is 0xF2, it is then to enter next step, otherwise judges Whether byte2 is 0xF1, and byte2 is 0xF1 return to step 3, and byte2 is not 0xF1 return to step 1；
Step 5）Judge whether position+1 is more than length, a byte is otherwise read forward, byte3 is designated as, be then forward Search and sync id information is not present；
Step 6）Position=position+1, and judge whether byte3 is 0xF3, it is then to enter next step, otherwise judges Whether byte3 is 0xF1, and byte3 is 0xF1 return to step 3, and byte3 is not 0xF1 return to step 1；
Step 7）Judge whether position+1 is more than length, a byte is otherwise read forward, byte4 is designated as, be then forward Search and sync id information is not present；
Step 8）Position=position+1, and judge whether byte4 is 0xF4, it is then to complete to search, otherwise judges Whether byte4 is 0xF1, and byte4 is 0xF1 return to step 3, and byte4 is not 0xF1 return to step 1.
3. Streaming Media according to claim 1 quickly positions order method, it is characterised in that：It is described backward search include with Lower step,
Step 1）Judge whether position-1 is less than length, a byte is otherwise read backward, byte1 is designated as, be then backward Search and be not present in sync id information, formula, position represents the position of program request time point corresponding video file, with byte For unit, length represents the start byte of video file；
Step 2）Position=position-1, and judge whether byte1 is 0xF4, it is then to enter next step, otherwise returns Step 1；
Step 3）Judge whether position-1 is less than length, a byte is otherwise read backward, byte2 is designated as, be then backward Search and sync id information is not present；
Step 4）Position=position-1, and judge whether byte2 is 0xF3, it is then to enter next step, otherwise judges Whether byte2 is 0xF4, and byte2 is 0xF4 return to step 3, and byte2 is not 0xF4 return to step 1；
Step 5）Judge whether position-1 is less than length, a byte is otherwise read backward, byte3 is designated as, be then backward Search and sync id information is not present；
Step 6）Position=position-1, and judge whether byte3 is 0xF2, it is then to enter next step, otherwise judges Whether byte3 is 0xF4, and byte3 is 0xF4 return to step 3, and byte3 is not 0xF4 return to step 1；
Step 7）Judge whether position-1 is less than length, a byte is otherwise read backward, byte4 is designated as, be then backward Search and sync id information is not present；
Step 8）Position=position-1, and judge whether byte4 is 0xF1, it is then to complete to search, otherwise judges Whether byte4 is 0xF4, and byte4 is 0xF4 return to step 3, and byte4 is not 0xF4 return to step 1.
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Inventor after: Wei Gang

Inventor after: Shi Xinming

Inventor after: Liu Jia

Inventor after: Chen Kun

Inventor after: Liu Changxin

Inventor after: Yang Fang

Inventor before: Wei Gang

CB03 Change of inventor or designer information