CN101137027A - Media slicing memory method - Google Patents
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- CN101137027A CN101137027A CNA2006101459180A CN200610145918A CN101137027A CN 101137027 A CN101137027 A CN 101137027A CN A2006101459180 A CNA2006101459180 A CN A2006101459180A CN 200610145918 A CN200610145918 A CN 200610145918A CN 101137027 A CN101137027 A CN 101137027A
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Abstract
The method includes: 1, Divide the media file into several fragments. Each fragment forms a slice with fixed size. Each slice at least includes one slice head and one data area. The head at least includes the slice number and the media label corresponding to this slice. The data area is for storing audio/video frame of the fragment corresponding to the slice according to the time stamp sequence; 2, Store evenly the formed slices in step 1 into several media units and build the storage record. This invention is mainly applied in grouped VOD system. It enhances storage efficiency, retrenches tediously load-balance calculation and increases the system expansibility.
Description
Technical field
The present invention relates to Web TV (Television over Internet Protocol, abbreviation IPTV), distributed flow media field, be particularly related to the method for the media slicing storage in a kind of video request program (Video On Demand is hereinafter to be referred as VOD) system.
Background technology
Cluster VOD system configuration is made up of the media units of a control unit and a plurality of storages as shown in Figure 1.Control unit is used for the storage at media units of process user request and management of media file, and media units is used for storing media content and the media data service is provided.Client is connected with media units with the control unit of system by network.
In cluster distributed VOD system, media store capacity and cluster problem of load balancing are research emphasis always.In existing research,, mainly contain whole file storage and two kinds of technology of coarseness burst storage at the media store problem.These two kinds of technology all require to carry out the multicopy storage to visiting frequent popular program or program segment, have so not only increased storage overhead, and the load-balancing algorithm complexity, finally can cause the cost of system to increase.
Summary of the invention
At defective that exists in the prior art and deficiency, the objective of the invention is to propose a kind of method of media slicing storage, to improve cluster VOD system storage efficiency, the problem of load balancing of resolution system and system extension problem.
For achieving the above object, the present invention proposes a kind of method of media slicing storage, comprising:
Step 1: media file is divided into a plurality of segments, and each segment is generated the burst of a fixed size, wherein each burst comprises head and a data field at least; Above-mentioned head comprise the burst number of this burst, the media identification of this burst correspondence at least; Above-mentioned data field is used for depositing according to the timestamp order audio/video frames of the segment of this burst correspondence;
Step 2: a plurality of bursts that step 1 is generated evenly are stored in a plurality of media units and generate stored record.
Adopt such scheme, as long as burst is enough little, it for example is the 64KB size, when code stream is 2Mbps, the sizableness of each burst was in 0.25 second playout length, can think that each user's service all is to provide service jointly by all media units, therefore also just solve popular media service capability not enough " hot issue ".Adopt such scheme simultaneously, each media file only need be stored a copy, has improved storage efficiency.The burst of medium is stored in a plurality of media units uniformly, can think to have reached natural load balancing, has realized the storage of media slicing list copy, has saved loaded down with trivial details load-balancing algorithm, has improved the extensibility of system simultaneously.Adopt technique scheme, system can provide basic broadcast, time-out, restore funcitons.
As preferably, the step 2 in the present embodiment can comprise:
Step 201: the burst of these medium number is stored in r the media units for the burst of k * N+r, wherein N is for participating in the media units sum of storage, k and r are positive integer, storage mode specifically as shown in Figure 3, C (i among the figure, j) be j the burst of medium i, insufficient section is filled with filling block;
Step 202: the storing process according to step 201 generates stored record, and above-mentioned stored record comprises the media units of each burst correspondence.
Burst evenly can be stored in a plurality of media units by simple method like this, not increase system load.
As preferably, the head of each burst also comprise a plurality of frame delineation items, and audio/video frames in each frame delineation item corresponding data district wherein comprises the key frame numbering of this audio/video frames correspondence at least in each frame delineation item.When generating burst, if the type of an audio/video frames is a key frame, then its key frame numbering is the numbering of itself, if the type of this audio/video frames is non-key frame, then its key frame numbering is the current key frame numbering.System can provide F.F. and rewind down function for the user like this, makes the function of cluster VOD system more powerful, user-friendly.
As preferably, the method for the media slicing storage that the present invention proposes also comprises:
Generate key video sequence frame index information table according to the numbering of the key frame in each burst head frame delineation item, above-mentioned key video sequence frame index information table is to be numbered keyword with key frame, and comprises frame number information in the corresponding burst of each key frame numbering number and this burst.Can make the user like this when carrying out F.F. or fast reverse operation, system finds F.F. according to the key video sequence frame index information table that generates or the accurate burst at the key frame place stepped back soon, and plays fast, improves the availability of system.
As preferably, the method for the media slicing storage that the present invention proposes also comprises:
Stored record and above-mentioned key video sequence frame index information table that above-mentioned steps 2 is generated store control unit into.Control unit can be inquired about fast, improve the response speed of system.
As preferably, the head of each burst also comprise: the frame number of audio/video frames and crucial frame number in this fragment data district.Can be convenient to system's control for system provides more detailed burst information like this.
As preferably, also comprise in each frame delineation item: the frame type of this audio/video frames, frame length, reserved word.Can provide the details of each audio/video frames of medium for system like this, and reserve reserved field in order to upgrading later on.
The method of the media slicing storage that the present invention proposes compared with prior art will generate burst behind the partitioning, and with the even distributed store of burst in a plurality of media units, each media file only need be stored a copy, has improved storage efficiency like this.Because these medium also evenly are stored in a plurality of media units by burst, when the user asked these medium, distribution of media loaded in each media units just balanced naturally, has saved loaded down with trivial details load-balancing algorithm, has improved the efficient of system.The technical scheme that adopts the present invention to propose only needs also to have improved the extensibility of system by increasing smoothly expanding system disposal ability of media units quantity.
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.For the person of ordinary skill in the field, from detailed description of the invention, above-mentioned and other purposes of the present invention, feature and advantage will be apparent.
Description of drawings
Fig. 1 is existing cluster VOD system logic block diagram;
Fig. 2 is the encapsulation format schematic diagram of burst in the method for the media slicing storage of the present invention's proposition;
Fig. 3 is the schematic diagram of media slicing stored interleaved in the method for the media slicing storage of the present invention's proposition;
System service schematic diagram during user's request one media file in the method for the media slicing storage that Fig. 4 proposes for the present invention.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing.
The method preferred embodiment of the media slicing storage that the present invention proposes is:
(I) media file is divided into a plurality of segments, and each segment is generated the burst of a fixed size, this burst should add head overhead byte and reserve bytes greater than the size of maximum frame of video, is 64KB in this preferred embodiment.The structure of each burst as shown in Figure 2, wherein each burst comprises head and a data field at least; Above-mentioned data field is used for depositing according to the timestamp order audio/video frames of the segment of this burst correspondence; Above-mentioned head comprise the burst number of this burst, the media identification of this burst correspondence at least, can also comprise the frame number and the crucial frame number of audio/video frames in this fragment data district; The head of each burst can also comprise a plurality of frame delineation items, and wherein audio/video frames in each frame delineation item corresponding data district comprises at least in each frame delineation item that the key frame of this audio/video frames correspondence is numbered; When generating burst, if the type of an audio/video frames is a key frame, then its key frame numbering is the numbering of itself, if the type of this audio/video frames is non-key frame, then its key frame numbering is the current key frame numbering; Can also comprise in each frame delineation item: the frame type of this audio/video frames, frame length, reserved word;
(II) burst of these medium number is stored in r the media units for the burst of k * N+r, wherein N is for participating in the media units sum of storage, k and r are positive integer, storage mode specifically as shown in Figure 3, C (i among the figure, j) be j the burst of medium i, insufficient section is filled with filling block (Pad);
(III) storing process according to step (II) generates stored record, and described stored record comprises the media units of each burst correspondence, and with burst number ordering;
(IV) generate key video sequence frame index information table according to the numbering of the key frame in each burst head frame delineation item, described key video sequence frame index information table is to be numbered keyword with key frame, and comprises frame number information in the corresponding burst of each key frame numbering number and this burst;
(V) the key video sequence frame index information table of stored information that step (III) is generated and step (IV) generation stores control unit into.
If the size of each burst is set at the 64KB size, when code stream is 2Mbps, the sizableness of each burst was in 0.25 second playout length, each media file is owing to the burst of medium is stored in a plurality of media units uniformly like this, can think to have reached natural load balancing, realize the storage of media slicing list copy, improve storage efficiency, save loaded down with trivial details load-balancing algorithm, improved the extensibility of system simultaneously.
When using the cluster VOD system of preferred embodiment of the present invention proposition, when the user selects a certain medium and plays these medium, control unit asks the burst of these medium normally to broadcast to media units 1, media units 2...... media units N respectively by the sequence number of burst according to the stored record of this medium correspondence as shown in Figure 4.Because media slicing is to be evenly distributed in a plurality of media units, when playing, just formed load balancing so naturally.
When the user utilized boxlike video recording and playing machine (Video Cassette Recorder is called for short VCR) to comprise time-out, recovery, F.F., these four kinds operations of rewind down, workflow was:
When the user selected to suspend, client stopped can to realize to the control unit request msg;
When the user selected to recover to play, next burst of in progress burst began can realize to media units request burst according to the sequence number of burst during from time-out;
When the user selects F.F. or rewind down, at first calculate the numbering of next key frame according to the speedometer of F.F. and rewind down, by searching key video sequence frame index information table, obtain the burst number at this key frame place, can realize according to burst number media units request burst corresponding in stored record.
Wherein, the structure of burst encapsulation of data can for:
Slice header
The data field
Burst head encapsulating structure can for:
Burst number
Media identification
The frame number
Crucial frame number
The frame delineation item, item number is variable
Frame delineation item encapsulating structure can for:
The ordinary video frame, 1: the key video sequence frame, 2: audio frame, other: keep
Frame length
Key frame numbering, ordinary video frame and audio frame are filled in current key frame number
Timestamp
Reserved word
Key video sequence frame index information table structure can for:
Media identification
Burst quantity
Key frame quantity
SDP information
The key frame directory entry, quantity is variable
Wherein each key frame indexed data structure can for:
The key frame numbering
Place burst number
Frame number in the burst is since 0
Reserved field
Wherein the data structure of stored information can for:
Media identification
Participate in the media units number of storage
Total burst number
The IP address list of media units, length is determined by bMstuCount
Certainly; the present invention also can have other embodiment; under the situation that does not deviate from spirit of the present invention and essence thereof; the person of ordinary skill in the field works as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of claim of the present invention.
Claims (7)
1. the method for media slicing storage comprises:
Step 1: media file is divided into a plurality of segments, and each segment is generated the burst of a fixed size, wherein each burst comprises head and a data field at least; Above-mentioned head comprise the burst number of this burst, the media identification of this burst correspondence at least; Above-mentioned data field is used for depositing according to the timestamp order audio/video frames of the segment of this burst correspondence;
Step 2: a plurality of bursts that above-mentioned steps 1 is generated evenly are stored in a plurality of media units and generate stored record.
2. the method for a kind of media slicing storage according to claim 1 is characterized in that above-mentioned steps 2 comprises:
Step 201: number for the burst of k * N+r is stored in r the media units, wherein N is for participating in the media units sum of storage with the burst of these medium, and k and r are positive integer;
Step 202: according to above-mentioned steps 201 canned datas, generate stored record, above-mentioned stored record comprises the media units of each burst correspondence.
3. the method for a kind of media slicing storage according to claim 1 and 2, it is characterized in that, the head of above-mentioned each burst also comprise a plurality of frame delineation items, wherein audio/video frames in each frame delineation item corresponding data district comprises at least in each frame delineation item that the key frame of this audio/video frames correspondence is numbered.
4. the method for a kind of media slicing storage according to claim 3 is characterized in that this method also comprises:
Generate key video sequence frame index information table according to the numbering of the key frame in each burst head frame delineation item, above-mentioned key video sequence frame index information table is to be numbered keyword with key frame, and comprises frame number information in the corresponding burst of each key frame numbering number and this burst.
5. the method for a kind of media slicing storage according to claim 4 is characterized in that, also comprises:
Stored record and above-mentioned key video sequence frame index information table that above-mentioned steps 2 is generated store control unit into.
6. the method for a kind of media slicing storage according to claim 5 is characterized in that the head of each burst also comprise: the frame number of audio/video frames and crucial frame number in this fragment data district.
7. the method for a kind of media slicing storage according to claim 6 is characterized in that, also comprises in each frame delineation item: the frame type of this audio/video frames, frame length, reserved word.
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Also Published As
| Publication number | Publication date |
|---|---|
| CN100556114C (en) | 2009-10-28 |
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