CN108347625A - A kind of method and apparatus of TS Streaming Medias positioning - Google Patents
A kind of method and apparatus of TS Streaming Medias positioning Download PDFInfo
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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]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/239—Interfacing the upstream path of the transmission network, e.g. prioritizing client content requests
- H04N21/2393—Interfacing the upstream path of the transmission network, e.g. prioritizing client content requests involving handling client requests
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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]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
- H04N21/23608—Remultiplexing multiplex streams, e.g. involving modifying time stamps or remapping the packet identifiers
-
- 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]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
- H04N21/2389—Multiplex stream processing, e.g. multiplex stream encrypting
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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]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/242—Synchronization processes, e.g. processing of PCR [Program Clock References]
-
- 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
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
- H04N21/4344—Remultiplexing of multiplex streams, e.g. by modifying time stamps or remapping the packet identifiers
-
- 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
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/435—Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream
-
- 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
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
- H04N21/4385—Multiplex stream processing, e.g. multiplex stream decrypting
-
- 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
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
- H04N21/4402—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display
Abstract
An embodiment of the present invention provides a kind of method and apparatus of TS Streaming Medias positioning,It is related to internet and signal processing technology field,First,Obtain the positioning playing request that user sends,Then,If not finding the index block description information comprising object time position in description information cache pool,It is then searched by binary chop and downloads target index block,Finally,It is determined and the nearest key frame byte location in object time position based on target index block,And the location of content of target TS contents is searched according to nearest key frame byte location,Achieve the purpose that quickly and accurately position TS contents,Present application addresses existing Streaming Media location technologies when being positioned to larger TS contents,Required positioning time longer technical problem,To realize the target location that TS contents can be accurately positioned,The technique effect of the target location of TS contents can be quickly positioned again.
Description
Technical field
The present invention relates to internet and signal processing technology field, method more particularly, to a kind of positioning of TS Streaming Medias and
Device.
Background technology
The characteristics of TS, that is, MPEG2-TS, MPEG2-TS format be exactly require all be since any segment of video flowing can be with
It is independent decoded.Since TS streams have the stronger ability for resisting transmission error code, it is transmitted in transmission media at present
MPEG-2 code streams be substantially all use TS stream packet format.Ensure service quality end to end to provide a user, needs
Will by CDN (Content Delivery Network) systems by video content from central source storage distribution to close to user terminal
Edge C DN nodes, VOD service is provided to the user by the streaming media server of edge C DN nodes.TS contents pass through media resource system
It is injected into CDN system, CDN system realizes storage, distribution and the caching of TS contents, is finally supplied to user to broadcast TS contents
It puts.From user play experience and play quality consider, it is desirable that CDN system provide TS contents accurate positioning and quickly, reduction is broadcast
Delay is put, play quality is improved.With the development of high definition business, TS contents are increasing, to the positioning delay requirement of TS contents
Also higher and higher.
The location technology of existing TS contents is roughly divided into following a few classes：TS files directly position, in byte ratio to TS texts
Part is positioned and TS files directly position and carry out the positioning method that positioning is combined to TS files in byte ratio.
The defect that the mode that TS files directly position is grown there are positioning time, since TS Documents Comparisons are big, according to traversal
Mode carry out positioning take it is bigger, lead to broadcast time-delay, and TS files are bigger, the delay of positioning is also bigger.In byte ratio
The mode positioned to TS files has that position inaccurate, the position not necessarily TS key frames of positioning influence
Result of broadcast.The directly positioning of TS files and by byte ratio to TS files carry out positioning method requirements that is combined of positioning scan it is whole
A TS files, in CDN system, fringe node not necessarily has complete TS files, needs from CDN Centroid Hui Yuan, because
And target location can not be got by the localization method.
In view of the above problems, not proposing effective solution also.
Invention content
In view of this, the purpose of the present invention is to provide a kind of method and apparatus of TS Streaming Medias positioning, it is existing to solve
Some Streaming Media location technologies are when positioning larger TS contents, required positioning time longer technical problem.
An embodiment of the present invention provides a kind of method of TS Streaming Medias positioning, the method for TS Streaming Medias positioning is applied to
In CDN system, including：The positioning playing request that user sends is obtained, the positioning playing request includes asking to play
The object time position of the content name of target TS contents and the target TS contents, the object time position are the target
The time location of TS content requests reproduction times；If do not found in description information cache pool comprising object time position
The index block description information set then is searched by binary chop and downloads target index block, wherein the target index block is packet
Index block containing the object time position；It is determined and the nearest key in the object time position based on the target index block
Frame byte location, and search according to the nearest key frame byte location location of content of the target TS contents.
Further, it is determined and the nearest key frame byte position in the object time position based on the target index block
It sets, and includes according to the location of content that the nearest key frame byte location searches the target TS contents：Parse the mesh
Index block is marked, the index block description information of the target index block is obtained, wherein the index block description information includes indexing
Beginning key frame time location and index terminate key frame time location；It is obtained and the target based on the index block description information
The nearest key frame byte location of time location, and then searched in the target TS according to the nearest key frame byte location
The location of content of appearance.
Further, the index block description information includes at least one of：Index starting keyframe time location, rope
Draw and terminates key frame time location, index byte offset location and index block length.
Further, searching download target index block by binary chop includes：From the description information cache pool
Search the first index block description information, wherein the first index block description information in the description information cache pool in institute
It states before object time position and the index block description information nearest with the object time position；If finding described first
Index block description information then searches the second index block description information in the description information cache pool, wherein second index
Block description information be the description information cache pool in after the object time position and with the object time position most
Close index block description information；If finding the second index block description information, obtains and be located at second index block
The position of the index block of description information and the first index block description information middle, and the index block of the middle is made
For the target index block.
Further, it if not finding the first index block description information, downloads last in index file
One index block, and institute is searched between the last one described index block and the index block of the middle by binary chop
Target index block is stated, until finding the target index block；If not finding the second index block description information,
Download index file first index block, and by binary chop first index block and the middle rope
Draw and search the target index block between block, until finding the target index block.
Further, the position of the index block of the middle is the position of the second index block description information and described
The position of first index block description information is added again divided by two is obtained.
Further, the method further includes：It is obtained from the target index block nearest with the object time position
Key frame byte location；The local TS contents of edge streaming server are scanned, if the edge streaming server
There are the target TS contents in local TS contents, then in the local TS contents of the edge streaming server described in positioning
Nearest key frame byte location；By in the local TS contents of the edge streaming server with the nearest key frame word
Position corresponding is saved as the target TS location of content, and by the corresponding target of the target TS location of content
TS contents are sent to terminal.
Further, the method further includes：If be not present in the local TS contents of the edge streaming server
The target TS contents are then searched from CDN central source content storage devices and are downloaded and the nearest key frame byte position
Set corresponding TS contents；The TS contents downloaded are scanned, are searched and the target TS location of content from the TS contents
Corresponding target TS contents；The corresponding target TS contents are sent to terminal.
According to embodiments of the present invention, a kind of device of TS Streaming Medias positioning, the dress of the TS Streaming Medias positioning are additionally provided
Set including：Acquiring unit, the positioning playing request for obtaining user's transmission, the positioning playing request includes asking to broadcast
The object time position of the content name and the target TS contents of the target TS contents put, the object time position is described
The time location of target TS content requests reproduction times；Download unit is searched, if for not looked into description information cache pool
The index block description information for including the object time position is found, then is searched by binary chop and downloads target index block,
Wherein, the target index block is the index block for including the object time position；Unit is searched and located, for being based on the mesh
Index block determination and the nearest key frame byte location in the object time position are marked, and according to the nearest key frame byte
The location of content of target TS contents described in location lookup.
Further, the search and orientation unit includes：Parsing module obtains institute for parsing the target index block
State the index block description information of target index block, wherein the index block description information include starting keyframe time location and
Terminate key frame time location；Module is searched and located, for being obtained and the object time based on the index block description information
The nearest key frame byte location in position, and then the target TS contents are searched according to the nearest key frame byte location
Location of content.
In embodiments of the present invention, first, the positioning playing request that user sends is obtained, then, if in description information
The index block description information comprising object time position is not found in cache pool, then is searched by binary chop and downloads target
Index block, finally, based on the determination of target index block and the nearest key frame byte location in object time position, and according to nearest
Key frame byte location searches the location of content of target TS contents.In embodiments of the present invention, it is downloaded by the increment segmented
The method of TS content indexings has achieved the purpose that quickly and accurately position TS contents, and then has solved existing stream matchmaker
Body location technology is when positioning larger TS contents, required positioning time longer technical problem, to realize
It the target location of TS contents can be accurately positioned and quickly positions the technique effect of the target location of TS contents.
Description of the drawings
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, in being described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, other drawings may also be obtained based on these drawings.
Fig. 1 is a kind of method flow diagram of the TS Streaming Medias positioning provided according to embodiments of the present invention；
Fig. 2 is a kind of structural schematic diagram of the CDN system provided according to embodiments of the present invention；
Fig. 3 is a kind of structure chart of the index block description information provided according to embodiments of the present invention；
Fig. 4 is a kind of method that searching download target index block by binary chop provided according to embodiments of the present invention
Flow chart；
Fig. 5 is that the one kind provided according to embodiments of the present invention indexes key frame byte location by object time position acquisition
Positioning flow flow chart；
Fig. 6 is that the one kind provided according to embodiments of the present invention indexes key frame byte location by object time position acquisition
Case study on implementation schematic diagram；
Fig. 7 is that a kind of location of content based on target TS contents provided according to embodiments of the present invention searches target TS contents
Flow chart；
Fig. 8 is a kind of schematic diagram of the device of the TS Streaming Medias positioning provided according to embodiments of the present invention.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with attached drawing to the present invention
Technical solution be clearly and completely described, it is clear that described embodiments are some of the embodiments of the present invention, rather than
Whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, shall fall within the protection scope of the present invention.
Embodiment one：
Fig. 1 is a kind of method flow diagram of the TS Streaming Medias positioning provided according to embodiments of the present invention, and the TS Streaming Medias are fixed
The method of position is applied in CDN system, as shown in Figure 1, including：
Step S102 obtains the positioning playing request that user sends, wherein positioning playing request includes asking to play
Target TS contents content name and the target TS contents object time position, object time position is in target TS
Hold the time location of request reproduction time.
Step S104, if not finding the index block description letter comprising object time position in description information cache pool
Breath is then searched by binary chop and downloads target index block, wherein target index block is the index for including object time position
Block.
Step S106, based on the determination of target index block and the nearest key frame byte location in object time position, and according to
Nearest key frame byte location searches the location of content of target TS contents.
In embodiments of the present invention, user terminal is broadcast to the positioning of CDN system transmission positioning playing TS video content requests
Request is put, the object time position of TS video contents to be played is carried in positioning playing request.Wherein, CDN system includes
CDN central sources content storage devices and CDN edge streaming servers.CDN central sources content storage devices can be provided in the sources TS
The storage of appearance and the generation of TS indexes；CDN edge streaming servers can provide the downloads of TS contents, caching, positioning and
Plug-flow provides streaming media service for terminal user.A kind of structure for CDN system that Fig. 2 is as provided according to embodiments of the present invention
Schematic diagram.
In embodiments of the present invention, first, the positioning playing request that user sends is obtained, then, if in description information
The index block description information comprising object time position is not found in cache pool, then is searched by binary chop and downloads target
Index block, finally, based on the determination of target index block and the nearest key frame byte location in object time position, and according to nearest
Key frame byte location searches the location of content of target TS contents.In embodiments of the present invention, it is downloaded by the increment segmented
The method of TS content indexings has achieved the purpose that quickly and accurately position TS contents, and then has solved existing stream matchmaker
Body location technology is when positioning larger TS contents, required positioning time longer technical problem, to realize
It the target location of TS contents can be accurately positioned and quickly positions the technique effect of the target location of TS contents.
In an alternative embodiment, it is determined and the nearest key frame byte in object time position based on target index block
Position, and include according to the location of content of nearest key frame byte location lookup target TS contents：
Target index block is parsed, the index block description information of target index block is obtained, wherein index block description information includes
It indexes starting keyframe time location and index terminates key frame time location；
Based on the acquisition of index block description information and the nearest key frame byte location in object time position, and then according to nearest
Key frame byte location search target TS contents location of content.
Specifically, index block description information includes at least one of：Index starting keyframe time location, index terminate
Key frame time location, index byte offset location and index block length.
Fig. 3 is a kind of structure chart of the index block description information provided according to embodiments of the present invention.In the embodiment of the present invention
In, as shown in figure 3, index block description information structure includes index byte offset location, index starting keyframe time location, rope
Draw and terminate key frame time location and index block length, wherein index byte offset location, refers to index block relative indexing file
The byte offset location of initial position is the integral multiple of index block fixed size；Starting keyframe time location is indexed, is index
PTS (Presentation Time Stamp, Presentation Time Stamp) time difference information of first key frame, relative indexing in block
The difference of the PTS of file first index block, first key frame；Index terminates key frame time location, is last in index block
The PTS time difference informations of one key frame, the difference of the PTS of relative indexing file first index block, first key frame.
In embodiments of the present invention, the method for downloading TS content indexings by the increment segmented, having reached can be quick
And the purpose of TS contents is accurately positioned, and then solve existing Streaming Media location technology and determine to larger TS contents
Position when, required positioning time longer technical problem, to realize can be accurately positioned TS contents target location and
The technique effect of the target location of TS contents can quickly be positioned.
Fig. 4 is a kind of method that searching download target index block by binary chop provided according to embodiments of the present invention
Flow chart.
In an alternative embodiment, target index block is downloaded including such as shown in figure 4, being searched by binary chop
Lower step：
Step S401 searches the first index block description information from description information cache pool, wherein the first index block describes
Information is index block description information nearest before object time position and with object time position in description information cache pool.
In embodiments of the present invention, index file is divided into solid by the index positioning unit in CDN edge streaming servers
Determine n block of size, i.e., above-mentioned index block, and the index block of buffered unit caches is retouched using cache pool record
Information is stated, the cache pool, that is, foregoing description information cache pond.
Step S402 searches second if finding the first index block description information from description information cache pool
Index block description information, wherein the second index block description information be description information cache pool in after object time position and
The index block description information nearest with object time position.
Step S403, if finding the second index block description information, obtain be located at the second index block description information and
The position of the index block of first index block description information middle, and using the index block of middle as target index block.
Step S404 downloads the last one in index file if not finding the first index block description information
Index block, and target index block is searched between the last one index block and the index block of middle by binary chop, directly
To finding target index block；
Step S405 downloads first index of index file if not finding the second index block description information
Block, and target index block is searched between first index block and the index block of middle by binary chop, until searching
To target index block.
Specifically, the position of the index block of middle is position and the description of the first index block of the second index block description information
The position of information is added again divided by two is obtained.
In embodiments of the present invention, the method for downloading TS content indexings by the increment segmented, having reached can be quick
And the purpose of TS contents is accurately positioned, and then solve existing Streaming Media location technology and determine to larger TS contents
Position when, required positioning time longer technical problem, to realize can be accurately positioned TS contents target location and
The technique effect of the target location of TS contents can quickly be positioned.
Below with a specific example come illustrate above by object time position acquisition index key frame byte location
Positioning flow.
Fig. 5 is that the one kind provided according to embodiments of the present invention indexes key frame byte location by object time position acquisition
Positioning flow flow chart.
As shown in figure 5, the positioning flow for indexing key frame byte location by object time position acquisition includes following step
Suddenly：
Step S501 receives client objectives time location seek_npt, wherein the positions seek_npt are time migration
Position.
Whether step S502 judges in index block description information cache pool to include the positions seek_npt, searches index block and retouch
Information cache pond is stated, index starting keyframe time location is found and is less than seek_npt and index end key frame time location
Index block description information more than seek_npt.
Step S503 terminates to search if the index block description information can be found, into the positions TS positioning flow.
Step S504 passes through binary chop if not finding the index block description information comprising the positions seek_npt
Method is searched, step S5041 to the flow that step S5045 is binary chop.
Step S5041 looks for the index block nearest from the positions the seek_npt left side to retouch from index block description information cache pool
Information min_block (that is, first index block description information in above-mentioned Fig. 4) is stated, according to the end in index block description information
Key frame time location and seek_npt are compared.
Step S5042 obtains the first of index file if index block description information is not found on the left sides seek_npt
A index block continues step S505 as index block to be downloaded.
Specifically, the block number of first index block is 0, and index block start byte deviation post is 0, the length of download
The as size of index block gives index download unit and downloads index block.
Step S5043 is slow from index block description information if nearest index block description information is found on the left sides seek_npt
It deposits and is looked in pond from index block description information max_block nearest on the right of the positions seek_npt (that is, the second rope in above-mentioned Fig. 4
Draw block description information), according in index block description information starting keyframe time location and seek_npt be compared.
Step S5044 obtains the last of index file if not finding index block description information on the right of seek_npt
One index block continues step SS505 as index block to be downloaded.
Specifically, the start byte deviation post of the last one index block is block number * block fixed sizes, the length of download
Degree is the length (the possible inadequate index block fixed size of the length of the last one index block) of the last one index block, is handed over
Index block is downloaded to index download unit.
Step S5045, if seek_npt on the right of find nearest index block description information, obtain max_block and
The position of the middles min_block index block in above-mentioned Fig. 4 positioned at the second index block description information and the first index block (that is, retouch
State the position of the index block of information middle), and then continue step S505.
Wherein, index block block number among calculating first, mid_block block numbers=(block number of max_block+
Min_block block numbers)/2, mid_block start byte deviation posts be mid_block block number * block fixed sizes, download
Length be index block length, give index download unit download index block.
Step S505 downloads index block, obtains index block start byte deviation post as download initial position, under acquisition
Length is carried, index content is downloaded from CDN central source content devices.
Step S506 parses index block, is completed by CDN edge streaming servers index resolution unit, after being parsed
The index content of parsing is given to buffer unit to cache.
Step S507, cache index block description information, parse first key frame time location of index block, as rise
Beginning key frame position, the last one key frame time location of index block index block number * ropes as key frame position is terminated
Draw block fixed size and originate download location as index block, three parameter description informations of index block are preserved in the buffer.
S502 is returned to step, that is, continues to judge in index block description information cache pool whether to include seek_npt
It sets, cycle executes, and until navigating to index key frame byte location seek_offset, exits positioning flow.
Fig. 6 is that the one kind provided according to embodiments of the present invention indexes key frame byte location by object time position acquisition
Case study on implementation schematic diagram.
As shown in fig. 6, first, downloading and numbering the index block for being 0 (that is, first rope in above-mentioned Fig. 5 in step S5042
Draw block), index block is parsed, indexing head is obtained, wherein indexing head parses indexing head all in the 1st index block, obtains index
The current size of file carries out stripping and slicing according to the current size of index file if index file size is 2592Kbytes to index,
Such as each index block fixed size 64Kbytes, 41 blocks are cut into, the block that the last one number is 40 in above-mentioned Fig. 5 (that is, walk
The index block of block number * blocks in rapid S5044) the inadequate 64Kbytes of size, only 32Kbytes sizes, seek_npt is user
Object time first time position, now are current TS content end time position.
By index key frame localization method shown in fig. 5, the index block number downloaded successively is 0,40,20 (that is, above-mentioned
The index block of middle described in Fig. 5), the index block that number is 0,20,40 shown in Fig. 6 as needs the block downloaded,
The index block that number is 20 includes object time position, gets key frame byte location seek_offset.
In embodiments of the present invention, index structure is used to describe index file, including indexing head and index record information,
In, indexing head includes the information such as TS code checks, speed, duration, size；Index record information includes each video frame of TS (I frames, P frames, B
Frame), the index records information such as PCR, further include TS byte offset locations, decoded time stamp DTS (Decoding in the record information
Time Stamp), Presentation Time Stamp PTS (Presentation Time Stamp), program clock reference PCR (Program
Clock Reference) etc. information.
In embodiments of the present invention, the method for downloading TS content indexings by the increment segmented, having reached can be quick
And the purpose of TS contents is accurately positioned, and then solve existing Streaming Media location technology and determine to larger TS contents
Position when, required positioning time longer technical problem, to realize can be accurately positioned TS contents target location and
The technique effect of the target location of TS contents can quickly be positioned.
Fig. 7 is that a kind of location of content based on target TS contents provided according to embodiments of the present invention searches target TS contents
Flow chart.
In an alternative embodiment, as shown in fig. 7, the flow for searching target TS contents includes the following steps：
Step S701 is obtained and the nearest key frame byte location in object time position from target index block.
Step S702 scans the local TS contents of edge streaming server.
Step S703 judges that the local TS contents of edge streaming server whether there is target TS contents.
Step S704, if it is judged that being then to position this in the local TS contents of edge streaming server recently
Key frame byte location.
Step S705, will be corresponding with nearest key frame byte location in the local TS contents of edge streaming server
Position as target TS location of content, and then continue to execute step S708.
Step S706, if it is judged that it is no, then it searches and downloads and nearest pass from CDN central source content storage devices
The corresponding TS contents of key frame byte location；
Step S707 scans the TS contents of the download, is searched from the TS contents corresponding with target TS location of content
Target TS contents；
TS contents corresponding with target TS location of content are sent to terminal by step S708.
In embodiments of the present invention, it is obtained and the nearest key frame byte in object time position first from target index block
Then the local TS contents of edge streaming server are scanned, if in the local TS contents of edge streaming server in position
There are target TS contents, then the nearest key frame byte location is positioned in the local TS contents of edge streaming server,
And then it is sent to terminal from the position by target TS contents；If mesh is not present in the local TS contents of edge streaming server
TS contents are marked, then searches and downloads corresponding with nearest key frame byte location from CDN central source content storage devices
TS contents scan the TS contents of the download, and target TS contents corresponding with target TS location of content are searched from the TS contents,
And then target TS contents are sent to terminal.
In embodiments of the present invention, CDN central sources content storage devices include：TS files injection unit, index generate single
Member and plug-flow unit, wherein TS file injection units are used to receive the injection of media resource system TS contents, by the storage of TS contents to originally
Ground, and content is managed, TS contents include real time content and non-real-time content, and real time content provides live streaming, time shift, reviews
Business, non-real-time content provide demand (telecommunication) service；Generation unit is indexed to be used to generate index file, index file description for TS contents
The information such as the deviation post of the duration of TS contents, size, type of coding and each video frame of TS in TS files；Plug-flow unit
Download TS for receiving CDN edge streaming servers or index request, by perhaps index is pushed to edge Streaming Media in TS
Server.
In embodiments of the present invention, CDN edge streaming servers include：TS/ indexes download unit, TS/ indexed caches
Unit, index resolution unit, index positioning unit, TS positioning units and plug-flow unit.
TS/ index download units, for supporting TS to download and index download, TS is downloaded i.e. from center source contents storage device
TS contents are downloaded, and TS contents slice is cached to buffer unit；Index is downloaded downloads rope from center source contents storage device
Draw content, and gives index content to index resolution unit and parse.
Indexed cache unit, for caching the index content after index resolution unit parsing indexes.
Resolution unit is indexed, the download content for receiving index download unit is parsed according to index structure and indexed, and will
Index content after parsing is cached by buffer unit, and the index content after parsing includes indexing head and index record letter
Breath, index record information includes the information of TS key frames.
Positioning unit is indexed, the request of the lookup key frame position for receiving TS positioning units, index positioning unit leads to
It crosses target time location and searches whether the index block description comprising the request target time in index block description information cache pool
Information, such as comprising, then index positioning unit and directly find request target time nearest key frame byte location from buffer unit,
Do not include such as, then by binary chop algorithm, finds the index block for needing to download, obtain the index byte bits of offset of index block
It sets, index block length, download the index block by indexing download unit, parse the index of index block, and by the content after parsing
It is cached by buffer unit, and index block description information is recorded in index block description information cache pool, index positioning
Unit continues through the request target time and positions the index block for including the request target time from index block description information cache pool,
It repeatedly executes, until finding key frame byte location.
TS positioning units, the positioning playing for receiving terminal user are asked, and object time position are got, from index
The key frame byte location near object time position is positioned, then target TS texts are searched from local by key frame byte location
Part, i.e. final goal byte location.If this destination edge node does not have, is downloaded and closed to CDN Centroids by TS download units
Key frame byte location.
Plug-flow unit is used for sending TS data since the TS key frame positions that TS positioning units navigate to terminal
Family provides terminal user and plays service.
In embodiments of the present invention, first, the positioning playing request that user sends is obtained, then, if in description information
The index block description information comprising object time position is not found in cache pool, then is searched by binary chop and downloads target
Index block, finally, based on the determination of target index block and the nearest key frame byte location in object time position, and according to nearest
Key frame byte location searches the location of content of target TS contents.In embodiments of the present invention, it is downloaded by the increment segmented
The method of TS content indexings has achieved the purpose that quickly and accurately position TS contents, and then has solved existing stream matchmaker
Body location technology is when positioning larger TS contents, required positioning time longer technical problem, to realize
It the target location of TS contents can be accurately positioned and quickly positions the technique effect of the target location of TS contents.
Embodiment two：
The embodiment of the present invention additionally provides a kind of device of TS Streaming Medias positioning, which is mainly used for
The method for executing the TS Streaming Medias positioning that the above of the embodiment of the present invention is provided, below to TS provided in an embodiment of the present invention
The device of Streaming Media positioning does specific introduction.
Fig. 8 is a kind of schematic diagram of the device of the TS Streaming Medias positioning provided according to embodiments of the present invention, as shown in figure 8,
The TS Streaming Medias positioning device includes mainly acquiring unit 10, searches download unit 20, searchs and locates unit 30, wherein：
Acquiring unit 10, the positioning playing request for obtaining user's transmission, positioning playing request includes asking to broadcast
The object time position of the content name and the target TS contents of the target TS contents put, object time position are in target TS
Hold the time location of request reproduction time；
Download unit 20 is searched, if for not finding the rope for including object time position in description information cache pool
Draw block description information, then searched by binary chop and download target index block, wherein target index block is to include the object time
The index block of position；
Unit 30 is searched and located, for being determined and the nearest key frame byte position in object time position based on target index block
It sets, and searches the location of content of target TS contents according to nearest key frame byte location.
Optionally, searching and locating unit includes：Parsing module obtains target index block for parsing target index block
Index block description information, wherein index block description information includes starting keyframe time location and end key frame time location；
Search and locate module, for based on index block description information obtain with the nearest key frame byte location in object time position, into
And the location of content of target TS contents is searched according to nearest key frame byte location.
In embodiments of the present invention, first, the positioning playing request that user sends is obtained, then, if in description information
The index block description information comprising object time position is not found in cache pool, then is searched by binary chop and downloads target
Index block, finally, based on the determination of target index block and the nearest key frame byte location in object time position, and according to nearest
Key frame byte location searches the location of content of target TS contents.In embodiments of the present invention, it is downloaded by the increment segmented
The method of TS content indexings has achieved the purpose that quickly and accurately position TS contents, and then has solved existing stream matchmaker
Body location technology is when positioning larger TS contents, required positioning time longer technical problem, to realize
It the target location of TS contents can be accurately positioned and quickly positions the technique effect of the target location of TS contents.
The technique effect and preceding method embodiment phase of the device that the embodiment of the present invention is provided, realization principle and generation
Together, to briefly describe, device embodiment part does not refer to place, can refer to corresponding contents in preceding method embodiment.
In addition, in the description of the embodiment of the present invention unless specifically defined or limited otherwise, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
Can also be electrical connection to be mechanical connection；It can be directly connected, can also indirectly connected through an intermediary, Ke Yishi
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
In the description of the present invention, it should be noted that term "center", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for the description present invention and simplify description, do not indicate or imply the indicated device or element must have a particular orientation,
With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.In addition, term " first ", " second ",
" third " is used for description purposes only, and is not understood to indicate or imply relative importance.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In several embodiments provided herein, it should be understood that disclosed systems, devices and methods, it can be with
It realizes by another way.The apparatus embodiments described above are merely exemplary, for example, the division of the unit,
Only a kind of division of logic function, formula that in actual implementation, there may be another division manner, in another example, multiple units or component can
To combine or be desirably integrated into another system, or some features can be ignored or not executed.Another point, it is shown or beg for
The mutual coupling, direct-coupling or communication connection of opinion can be by some communication interfaces, device or unit it is indirect
Coupling or communication connection can be electrical, machinery or other forms.
The unit illustrated as separating component may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, you can be located at a place, or may be distributed over multiple
In network element.Some or all of unit therein can be selected according to the actual needs to realize the mesh of this embodiment scheme
's.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it can also
It is that each unit physically exists alone, it can also be during two or more units be integrated in one unit.
It, can be with if the function is realized in the form of SFU software functional unit and when sold or used as an independent product
It is stored in the executable non-volatile computer read/write memory medium of a processor.Based on this understanding, of the invention
Technical solution substantially the part of the part that contributes to existing technology or the technical solution can be with software in other words
The form of product embodies, which is stored in a storage medium, including some instructions use so that
One computer equipment (can be personal computer, server or the network equipment etc.) executes each embodiment institute of the present invention
State all or part of step of method.And storage medium above-mentioned includes：USB flash disk, mobile hard disk, read-only memory (ROM, Read-
Only Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. are various can be with
Store the medium of program code.
Finally it should be noted that：Embodiment described above, only specific implementation mode of the invention, to illustrate the present invention
Technical solution, rather than its limitations, scope of protection of the present invention is not limited thereto, although with reference to the foregoing embodiments to this hair
It is bright to be described in detail, it will be understood by those of ordinary skill in the art that：Any one skilled in the art
In the technical scope disclosed by the present invention, it can still modify to the technical solution recorded in previous embodiment or can be light
It is readily conceivable that variation or equivalent replacement of some of the technical features；And these modifications, variation or replacement, do not make
The essence of corresponding technical solution is detached from the spirit and scope of technical solution of the embodiment of the present invention, should all cover the protection in the present invention
Within the scope of.Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. a kind of method of TS Streaming Medias positioning, which is characterized in that the method for the TS Streaming Medias positioning is applied to CDN system
In, including：
The positioning playing request that user sends is obtained, the positioning playing request includes the target TS contents for asking to play
The object time position of content name and the target TS contents, the object time position are that the target TS content requests are broadcast
Put the time location of time；
If not finding the index block description information for including the object time position in description information cache pool, pass through
Binary chop, which is searched, downloads target index block, wherein the target index block is the index for including the object time position
Block；
Based on the target index block determine with the nearest key frame byte location in the object time position, and according to it is described most
Close key frame byte location searches the location of content of the target TS contents.
2. according to the method described in claim 1, it is characterized in that, being determined and the object time based on the target index block
The nearest key frame byte location in position, and searched in the target TS contents according to the nearest key frame byte location
Holding position includes：
The target index block is parsed, the index block description information of the target index block is obtained, wherein the index block description
Information includes that index starting keyframe time location and index terminate key frame time location；
It is obtained and the nearest key frame byte location in the object time position, and then basis based on the index block description information
The nearest key frame byte location searches the location of content of the target TS contents.
3. according to the method described in claim 1, it is characterized in that, the index block description information includes at least one of：
Index starting keyframe time location, index terminates key frame time location, indexes byte offset location and index block length.
4. according to the method described in claim 1, downloading target index block packet it is characterized in that, being searched by binary chop
It includes：
The first index block description information is searched from the description information cache pool, wherein the first index block description information
For index block nearest before the object time position and with the object time position in the description information cache pool
Description information；
If finding the first index block description information, the description of the second index block is searched in the description information cache pool
Information, wherein the second index block description information be the description information cache pool in after the object time position
And the nearest index block description information with the object time position；
If finding the second index block description information, obtain positioned at the second index block description information and described the
The position of the index block of one index block description information middle, and indexed the index block of the middle as the target
Block.
5. according to the method described in claim 4, it is characterized in that,
If not finding the first index block description information, the last one index block in index file is downloaded, and
The target index block is searched between the last one described index block and the index block of the middle by binary chop,
Until finding the target index block；
If not finding the second index block description information, first index block of index file is downloaded, and is passed through
Binary chop searches the target index block between first index block and the index block of the middle, until looking into
Find the target index block.
6. according to claim 4 to 5 any one of them method, which is characterized in that the position of the index block of the middle is
The position of the second index block description information is added with the position of the first index block description information again divided by obtained by two
's.
7. according to the method described in claim 1, it is characterized in that, the method further includes：
It is obtained and the nearest key frame byte location in the object time position from the target index block；
The local TS contents for scanning edge streaming server, if deposited in the local TS contents of the edge streaming server
In the target TS contents, then the nearest key frame word is positioned in the local TS contents of the edge streaming server
Section is set；
By position corresponding with the nearest key frame byte location in the local TS contents of the edge streaming server
It sets as the target TS location of content, and the corresponding target TS contents of the target TS location of content is sent to end
End.
8. the method according to the description of claim 7 is characterized in that the method further includes：
If the target TS contents are not present in the local TS contents of the edge streaming server, from CDN central sources
It is searched in content storage devices and downloads TS contents corresponding with the nearest key frame byte location；
The TS contents downloaded are scanned, target TS corresponding with the target TS location of content is searched from the TS contents
Content；
The corresponding target TS contents are sent to terminal.
9. a kind of device of TS Streaming Medias positioning, which is characterized in that the device of the TS Streaming Medias positioning includes：
Acquiring unit, the positioning playing request for obtaining user's transmission, the positioning playing request include asking to play
Target TS contents content name and the target TS contents object time position, the object time position be the mesh
Mark the time location of TS content requests reproduction times；
Download unit is searched, if for not finding the index for including the object time position in description information cache pool
Block description information is then searched by binary chop and downloads target index block, wherein the target index block is to include the mesh
Mark the index block of time location；
Unit is searched and located, for being determined and the nearest key frame byte in the object time position based on the target index block
Position, and search according to the nearest key frame byte location location of content of the target TS contents.
10. device according to claim 9, which is characterized in that the search and orientation unit includes：
Parsing module obtains the index block description information of the target index block for parsing the target index block, wherein
The index block description information includes starting keyframe time location and end key frame time location；
Module is searched and located, for being obtained and the nearest key frame in the object time position based on the index block description information
Byte location, and then search according to the nearest key frame byte location location of content of the target TS contents.
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