CN101626304A - Method for realizing multimedia instant play under P2P protocol and device thereof - Google Patents
Method for realizing multimedia instant play under P2P protocol and device thereof Download PDFInfo
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Abstract
The invention provides a method for realizing multimedia instant play under P2P protocol so as to solve the problem that a waste of time and resources exists in the method for downloading multimedia files based on the P2P protocol; the method of the invention comprises the following steps: a multimedia player is started to play obtained multimedia file block units; the multimedia file block units which are not obtained are classified by the urgency degree of needs according to multimedia play position; network nodes are classified according to the speed of obtaining the multimedia file block units from the network nodes; a request to obtaining a multimedia file block unit which is corresponding to a special network node category from the special network node category is sent and network nodes request with faster speed can obtain the multimedia file block units with higher urgency degree of needs. The invention can judge whether the multimedia file in download meets the demands, thus avoiding the waste of the network resource.
Description
Technical field
The present invention relates to a kind of play-back technology of multimedia file, particularly pass through the play-back technology of the multimedia file of Network Transmission.
Background technology
Technology based on P2P (Peer to Peer) agreement has solved being easy to because of exhausting the problem that the server hardware resource reduces download efficiency that client-server pattern file in download exists, makes the transmission of big file on network become more convenient.This has also directly promoted the transmission of multimedia file on network.Download and this document need be downloaded in the local memory device based on the multimedia file of P2P technology, this process consumes the regular hour according to the big or small needs of file.The user can utilize multimedia player to play this document after downloading to complete multimedia file.
There is following problem in the mode of existing download multimedia file based on the P2P agreement: the unsatisfied words of multimedia file that the user obtains download for a certain reason, need again download package to contain the multimedia file that needs content, regular hour and Internet resources have been expended and download first multimedia file, and multimedia file in download also may make us dissatisfied again, this just means and need expend time in once more and Internet resources, causes bigger waste.
Summary of the invention
In order to solve losing time and problem of resource that existing download multimedia file mode based on the P2P agreement exists, the invention provides the device of realizing the instant method of playing of multimedia under a kind of P2P agreement and realizing this method.The part multimedia file that instant broadcast has just downloaded to can judge whether this document is satisfactory, needn't just can make a decision after having expended plenty of time and Internet resources, thereby avoid the problem of wasting.
Technical scheme of the present invention is as follows:
Realize under the P2P agreement that the instant method of playing of multimedia comprises the steps:
A, startup multimedia player are play the multimedia file block units that obtains;
B, the multimedia file block units that will also not obtain according to the multimedia progress are classified by the demand pressing degree;
C, basis are classified network node from the speed that network node obtains the multimedia file block units;
The multimedia file block units of the coupling classification that D, the particular network node classification request acquisition step B that obtains to step C obtain, the principle that step C classification and step category-B do not mate is: the high multimedia file block units of fireballing network node request acquiring demand pressing degree.
Realize under the described P2P agreement that the instant method of playing of multimedia also comprises the steps: to set time-out time into network node, surpass described time-out time if obtain the time of multimedia file block units from this network node, then cancel process from this multimedia file block units to this network node that obtain.
Realize under the described P2P agreement that the instant method of playing of multimedia also comprises the steps: to obtain the original position and the end position of multimedia file in the downloaded files.
Realize under the described P2P agreement that the instant method of playing of multimedia also comprises the steps: then to slow down the speed of play multimedia files block units if the described player plays position required multimedia file block units of follow-up certain reproduction time is less than the quantity of setting.
If positioning action such as carried out F.F. or fall back, perhaps the player plays position moves to the still uncompleted position of buffered data, then earlier player is suspended, and from then on the position begins request msg, continues when the pending data amount is enough to play to play again.
The P2P agreement is the Bittorrent agreement, in the Bittorent handshake packet that transmits between network node sign is set, and shows that needs preferentially provide file block unit to the network node that sends handshake packet.
Described sign is arranged at the highest order of last byte of attribute field in the Bittorent handshake packet.
Realize the instant device of playing of multimedia under the P2P agreement, be arranged on the terminal of file in download, comprise multimedia player and multimedia control module, multimedia player is connected with the multimedia control module, multimedia player is used for the play multimedia files block units, and the multimedia control module is carried out following steps:
The type of the file block unit that acquires also starts multimedia player;
Divide some levels according to issuing a request to the cycle of the obtaining length that obtains the multimedia file block units from high to low with network node;
According to the urgency level of multimedia file block units demand with the classification of NO multimedia file block units, to obtaining the short high multimedia file block units of network node request acquiring demand urgency level of cycle.
The multimedia control module is also carried out following steps:
Surpass default time-out time if obtain the time of multimedia file block units from network node, then cancel process from this multimedia file block units to this network node that obtain.
The multimedia control module is also carried out following steps:
Obtain the original position and the end position of multimedia file in the downloaded files.
The multimedia control module is also carried out following steps:
If the described player plays position required multimedia file block units of follow-up certain reproduction time is less than the quantity of setting, then slow down the broadcasting speed of multimedia player.
Technique effect of the present invention:
Because the present invention can realize playing while downloading based on the multimedia file of P2P agreement, this just can play under the situation of only having downloaded part multimedia file block units, whether be needs according to playing if can judge this file, thereby avoided expending the problem that plenty of time and Internet resources are downloaded unwanted multimedia file.
Description of drawings
Fig. 1 is a flow chart of realizing the instant method of playing of multimedia under the P2P agreement.
Fig. 2 is for having the flow process of file in download under the secondary piecemeal situation when the multimedia file block units.
Embodiment
This part is elaborated to technical scheme of the present invention in conjunction with the accompanying drawings.
Fig. 1 has illustrated that the present invention realizes the key step of the instant method of playing of multimedia.
At first, the process of the file in download of beginning under the P2P agreement.Can obtain the type of multimedia file according to information such as file address that obtains or seed files, this can obtain by the extension name of file, the request earlier of concrete needs is near a piecemeal of multimedia file starting position, obtain after first piecemeal, can know file format by inference according to file extension, owing to the information such as structure of having preserved multimedia file, thereby can analyze, obtain information such as film code check, index original position multimedia file structure at file header.According to the index original position that obtains, begin request msg from position near index, obtain complete multimedia file index.Begin request msg from play position, the fluency of the data of buffering sufficient length to guarantee to play.From play position, the follow-up a certain amount of multimedia file block units that will play (as playing 2 minutes piecemeal amount) constitutes play buffer.Obtaining file header, index, and cushioned after the partial document block units,, started Directshow or Mediaplayer playing module for common multimedia file type such as wmv, avi, rmvb, rm etc., for the flash form, then start the flash player.
If positioning action such as carried out F.F. or fall back, perhaps the player plays position moves to the still uncompleted position of buffered data, then earlier player is suspended, and from then on the position begins request msg, continues when the pending data amount is enough to play to play again.After the data that cushioned a long enough byte, request msg that then can be at random, but whether all detect the buffer data of a player plays position when asking enough at every turn, and override requests is near the multimedia file block units of play position.
Under the situation of using seed file, therefore more than one of downloaded files possibility, can calculate original position and the end position of this multimedia file in some files after obtaining seed file.
On the terminal of implementing the inventive method, the player (can be one or more players) that can play some types of multimedia files is set, starts the player that is suitable for according to the multimedia file type that obtains.
Pressing degree is as required classified also NO multimedia file block units, is divided into high-priority queue, normal priority formation and Low Priority Queuing successively at this.The present invention is in downloading the multimedia file process, owing to need to play the multimedia file block units that has obtained, according to the progress of playing, to the demand pressing degree of NO multimedia file block units also is different, as the file block unit that plays after 10 minutes, just need the demand pressing degree of the file block unit that plays higher after 2 minutes.
The network node classification of multimedia file block units will be provided according to the length that obtains the multimedia file block units time (DRTT).DRTT is meant at a certain network node, (size of piecemeal should be suitable to the time that obtains this document block units from this network node from sending file block unit's request of download, to avoid DRTT long), the network node that will connect according to the length of this time is divided into some grades (class).Set time-out time for network node simultaneously, if the time that obtains the multimedia file block units from this network node above described time-out time, is then cancelled process from this multimedia file block units to this network node that obtain.
Above-mentioned network node and the multimedia file block units of finishing classification mated, and matched rule can have multiple, and principle is exactly that the file block unit of more urgent needs tends to download to the short network node request of DRTT.So just guaranteed that as much as possible playing process can not occur interrupting owing to file block unit also downloads.According to the matched rule of determining, to the multimedia file block units of the network node request needs that mate.
Multimedia player can be downloaded the alternative document block units in the play multimedia files block units, owing to the situation of the needed file block unit of the follow-up certain reproduction time of the current play position of multimedia player deficiency might occur, thereby making to play interrupts.In order to alleviate this situation institute, the present invention sets concrete above-mentioned certain reproduction time, when if needed multimedia file block units lacks in this certain reproduction time after the current play position, broadcasting speed is reduced, be equivalent to postpone time waiting and obtain enough multimedia file block units, this has reduced the probability that interruption takes place to a certain extent, and the reduction of broadcasting speed can not produce too much influence to result of broadcast.Certainly, above-mentionedly slow down being provided with of broadcasting speed and can be divided into multistage setting, in other words when the multimedia file block units that lacks during less than a, reduce broadcasting speed to b, when the multimedia file block units that lacks during less than c, the reduction broadcasting speed is to d, a is less than c, b is greater than d, and the rest may be inferred is provided with step by step, to the last stops to play.
Because the present invention need download to the multimedia file block units as early as possible, therefore sign can be set in the network of P2P agreement show the preferential file in download block units of needs, sign specifically is set can be adopted the method shown in the similar following example (with the Bittorrent agreement is example: in the Bittorent handshake packet that transmits sign is set between network node, shows that needs preferentially provide file block unit to the network node that sends handshake packet; Described sign is arranged at the highest order of last byte of attribute field in the Bittorent handshake packet, and this highest order is set to 1, because this position is not used at present, therefore can be used as sign.
Also has the situation that file block unit further is divided into secondary piecemeal in the P2P agreement, as file block acquiescence unit-sized in the Bittorrent agreement is 256K, each file block unit can further be divided into a plurality of secondary piecemeals---and 64 bursts, the size of each burst are 4K.Can with the burst unit in the downloading process, like this can be than being easier to successfully downloading slicing (occur easily causing failed download owing to making a mistake if can only download the file block unit of 256K, download efficiency reduces) under network bandwidth condition of limited.And broadcast is still carried out with the such file block unit of 256K among the present invention, and a level piecemeal does not carry out in proper order, is convenient to reduce the checking number of times to the piecemeal (file block unit or secondary piecemeal) that will play like this.The existence of secondary piecemeal makes and the coupling of network node becomes complicated, and Fig. 2 has disclosed the downloading process that exists under the secondary piecemeal situation for example.
Before disclosing flow process shown in Figure 2, need to be described as follows situation, for convenience of description, abbreviate file block unit as piecemeal, abbreviate secondary piecemeal as burst with the lower part.
The network node that the terminal that needs are play connects is divided into high priority and normal priority according to the length of DRTT, and the DRTT of high-priority network node is short than the DRTT of normal priority network node.Be categorized as according to the burst that the pressing degree of burst demand (as from bright pressing degrees of position relation table such as the distance of play position, front and back) will not downloaded: high-priority queue, normal priority formation and Low Priority Queuing.The principle of burst classification is as follows: the burst in the high-priority queue is the data in the buffering area after the play position, and player will soon need to use it, therefore will obtain as early as possible; The burst of normal priority formation is play position buffering area data afterwards afterwards, and these bursts also can be played later on, but can't be played immediately, so priority is taken second place; The burst of Low Priority Queuing may be the burst before the play position, also may be and play irrelevant data, so its priority is minimum.
Judge at first whether the network node that connects is high priority.Cause playing interruption for fear of the overlong time of waiting for some bursts, therefore all set a time-out time for network node, it is shorter that the time-out time of high priority is set, and it is longer that the time-out time of normal priority is set.Regularly detect the DRTT that obtains each burst and whether surpass the time-out time that this network node is set, if it is overtime, then cancel the process of obtaining this burst from this network node, the play position current according to multimedia player, calculate the degree of priority of this burst, put into corresponding Priority Queues, and recomputate the priority level of this network node.If just connect with a network node, then need establish its time-out time is a certain numerical value (as being the time-out time of high-priority users).Stipulate that length (as 1 second), is judged that then this network node is a high priority, otherwise is low priority if the average DRTT time is worth less than this as the boundary to user class sometime.For the process of the acquisition burst of having cancelled, write down the tabulation of these information to one, when a burst is downloaded, detect it and whether be requested, if asked this burst,, all this burst is write disk or buffering area no matter whether be cancelled.If do not ask this burst, think that this burst is wrong, abandons this burst.
According to speed from the acquisition burst of each network node, and then can obtain total downloading rate of this locality (sending the network node of file in download block units request), total downloading rate on the log history can also obtain the total downloading rate peak value in the past period simultaneously.If the current more and current approaching total speed peak value of total speed of download of quantity that needs the high-priority queue of download then should reduce the request to burst in normal priority formation and the Low Priority Queuing, to accelerate the download of high priority burst.
In the process that multimedia player is play, regularly detect the state of buffering area after the play position, if buffering area piecemeal quantity is not enough, the broadcasting speed of the player that then can suitably slow down, to obtain longer time waiting data, if a just little blocks of data no show still, the shortage of these data does not influence result of broadcast, then when being played to this position, can directly skip this little blocks of data, if a bulk of data, the broadcasting speed that then slows down is up to static, finishes up to data buffering and restarts broadcast.
As follows to the process description shown in Fig. 2.
Whether if network node is a high priority, then detecting earlier has urgent piecemeal to need to download in the play buffer, if there is urgent piecemeal to need request, then the piecemeal with high-priority queue or normal priority formation compares, and selects more urgent.Detect the burst whether this piecemeal is arranged in high priority, normal priority, the Low Priority Queuing then successively, if the burst of this piecemeal is arranged in certain priority query, then sent partly request before the explanation, just fail all to ask, so remaining burst is asked away successively one by one.If all there is not the burst of this piecemeal in these three formations, what request was described is a new urgent piecemeal, asks after the burst of this piecemeal all the other bursts to be put into high-priority queue.
If there is not urgent piecemeal to need request in the buffering area, so be that piecemeal has all been downloaded or all has been referred in each Priority Queues in the buffering area, whether then detect successively has burst to ask in high priority, normal priority, the Low Priority Queuing, if have, then ask this burst,, check then whether network node has the local piecemeal that needs to ask if do not have, if still do not have, then send the piecemeal request at random.
If the network node that connects is a normal priority, then directly begin request from Low Priority Queuing.If there is not the burst that can ask in the Low Priority Queuing, then detect the piecemeal that this locality that whether can ask this network node to have needs successively, perhaps send the piecemeal request at random.
The present invention also provides the instant playing device of multimedia of realizing said method, specifies as follows.
Realize under the P2P agreement of the present invention that the instant device of playing of multimedia is arranged on the terminal of file in download, comprise multimedia player and multimedia control module, multimedia player is connected with the multimedia control module, multimedia player is used for the play multimedia files block units, and the multimedia control module is carried out following steps:
The type of the file block unit that acquires also starts multimedia player;
Divide some levels according to issuing a request to the cycle of the obtaining length that obtains the multimedia file block units from high to low with network node;
According to the urgency level of multimedia file block units demand with the classification of NO multimedia file block units, to obtaining the short high multimedia file block units of network node request acquiring demand urgency level of cycle.
Be that the multimedia control module is carried out step illustrated in figures 1 and 2, specifically describe the explanation of seeing Fig. 1 and Fig. 2, in needs, call multimedia player play multimedia files block units.
Claims (10)
1, realizes the instant method of playing of multimedia under the P2P agreement, it is characterized in that comprising the steps:
A, startup multimedia player are play the multimedia file block units that obtains;
B, the multimedia file block units that will also not obtain according to the multimedia progress are classified by the demand pressing degree;
C, basis are classified network node from the speed that network node obtains the multimedia file block units;
The multimedia file block units of the coupling classification that D, the particular network node classification request acquisition step B that obtains to step C obtain, the principle that step C classification and step category-B do not mate is: the high multimedia file block units of fireballing network node request acquiring demand pressing degree.
2, according to realizing the instant method of playing of multimedia under the described P2P agreement of claim 1, it is characterized in that also comprising the steps: setting time-out time into network node, surpass described time-out time if obtain the time of multimedia file block units from this network node, then cancel process from this multimedia file block units to this network node that obtain.
3, according to realizing the instant method of playing of multimedia under claim 1 or the 2 described P2P agreements, it is characterized in that also comprising the steps: to obtain the original position and the end position of multimedia file in the downloaded files.
4, according to realizing the instant method of playing of multimedia under claim 1 or the 2 described P2P agreements, it is characterized in that also comprising the steps: then slowing down the speed of play multimedia files block units if the described player plays position required multimedia file block units of follow-up certain reproduction time is less than the quantity of setting.
5, according to realizing the instant method of playing of multimedia under claim 1 or the 2 described P2P agreements, it is characterized in that the P2P agreement is the Bittorrent agreement, in the Bittorent handshake packet that between network node, transmits sign is set, shows that needs preferentially provide file block unit to the network node that sends handshake packet.
6, according to realizing the instant method of playing of multimedia under the described P2P agreement of claim 5, it is characterized in that described sign is arranged at the highest order of last byte of attribute field in the Bittorent handshake packet.
7, realize the instant device of playing of multimedia under the P2P agreement, it is characterized in that being arranged on the terminal of file in download, comprise multimedia player and multimedia control module, multimedia player is connected with the multimedia control module, multimedia player is used for the play multimedia files block units, and the multimedia control module is carried out following steps:
The type of the file block unit that acquires also starts multimedia player;
Divide some levels according to issuing a request to the cycle of the obtaining length that obtains the multimedia file block units from high to low with network node;
According to the urgency level of multimedia file block units demand with the classification of NO multimedia file block units, to obtaining the short high multimedia file block units of network node request acquiring demand urgency level of cycle.
8, instant playing device according to claim 7 is characterized in that the multimedia control module also carries out following steps:
Surpass default time-out time if obtain the time of multimedia file block units from network node, then cancel process from this multimedia file block units to this network node that obtain.
9,, it is characterized in that the multimedia control module also carries out following steps according to claim 7 or 8 described instant playing devices:
Obtain the original position and the end position of multimedia file in the downloaded files.
10,, it is characterized in that the multimedia control module also carries out following steps according to claim 7 or 8 described instant playing devices:
If the follow-up multimedia file block units in described player plays position is less than the quantity of setting, then slow down the broadcasting speed of multimedia player.
If positioning action such as carried out F.F. or fall back, perhaps the player plays position moves to the still uncompleted position of buffered data, then earlier player is suspended, and from then on the position begins request msg, continues when the pending data amount is enough to play to play again.
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| CN200910000242A CN101626304A (en) | 2008-07-11 | 2009-01-14 | Method for realizing multimedia instant play under P2P protocol and device thereof |
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| CN200910000242A Pending CN101626304A (en) | 2008-07-11 | 2009-01-14 | Method for realizing multimedia instant play under P2P protocol and device thereof |
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