CN101552796B - Time-shifting operation method and device thereof - Google Patents
Time-shifting operation method and device thereof Download PDFInfo
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- CN101552796B CN101552796B CN200810090233XA CN200810090233A CN101552796B CN 101552796 B CN101552796 B CN 101552796B CN 200810090233X A CN200810090233X A CN 200810090233XA CN 200810090233 A CN200810090233 A CN 200810090233A CN 101552796 B CN101552796 B CN 101552796B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—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
- H04N21/433—Content storage operation, e.g. storage operation in response to a pause request, caching operations
- H04N21/4333—Processing operations in response to a pause request
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Abstract
The inventive embodiment claims a time-shifting operation method and a device thereof. The time-shifting operation method comprises the following steps of obtaining time-shifting parameters of a live stream; creating and maintaining a time-shifting progress bar of the live stream according to the time-shifting parameters; and operating within the range indicated by the time-shifting progress bar. By the application of the invention, the time-shifting ability supported by a sever and the current state of a time-shifting buffer zone are informed to a client terminal that shows the time-shifting progress bar and real-time state change to the user, so that the usability and the precision of the time-shifting operation of the user are strengthened, and the effect of the user experiences is improved.
Description
Technical field
The present invention relates to the multimedia transmission field, particularly relate to a kind of time shift operation method and apparatus.
Background technology
Streaming media service is a kind of multimedia application that grows up from Internet, refers to use the multimedia file of stream (Streaming) mode in transmission over networks, comprises audio frequency, video and animation etc.The main feature of streaming media transmission technique is to carry out the transmission of multi-medium data with the form of stream (streaming).Be put into continuous image and acoustic information on the webserver through after the processed compressed; Client need not downloaded entire media file before broadcast; But when the information of in buffer area, having received plays; The remainder of multimedia file will download to client from server continuously, i.e. " download on the limit, and play on the limit ".So just avoided the user when watching or listening to Media Stream, will spend a period of time and downloaded to client to complete file, can bring the professional sensory experience of " real-time play " to the user.
Program source source mode difference according to flow-medium performance can be divided into storage (stored) program and live (live) program; The program source of storage program is generally from the storage file, and the business such as program request of streaming media service adopt this mode that operations such as the program client that storage mode provides can position in broadcast, F.F., rewind down are provided usually; And the general program source of programme televised live is from live source, like on-the-spot broadcasting or radio and television etc., what this program normally can not rollback.
Packet switched streaming professional (Packet-switch Streaming Service, PSS) be the 3GPP definition based on real-time stream media protocol (Real Time Streaming Protocol, the agreement that is used to provide streaming media service that RTSP) realizes.This agreement has been continued to use the technology of above-mentioned Internet Streaming Media basically.Equally program request and live content can be provided.It is adaptive that PSS has carried out a part of modification to mobile network's situation to RTSP, thereby can realize the time-shift service of live content.
In the prior art; Think among the PSS that live TV stream is the stream that can not position operation and can only play at special time; It uses Session Description Protocol (Session Description Protocol; SDP) " a=range " attribute indicates whether and can locate in; What in range, use is open time range, promptly has only zero-time not have the concluding time, is convection current to position operation like " a=range:npt=now-" or " a=range:clock=20030825T152300Z-" expression; In SDP, use simultaneously " t=", " r=" and parameters such as " z=" can indicate the time that continues of program; Whether can indicate live TV stream through these two.
Client is according to these information, can present time range of programme televised live or a period of time in channel, except suspending or stopping, not supporting other VCR operations.
But, after server provides time-shift service, make client when playing programme televised live, also can review the content of live some front a period of time.But utilize prior art to notify client with the time shift characteristic of server, like this, even server is supported time-shift service, client also has no way of learning.
On the other hand, suppose that the client well known server supports time-shift service, but but do not know the scope of time shift.If the maximum time shift buffering area of server is 30 minutes; Client has been suspended 50 minutes; The time shift buffering area will overflow, and client is not known this point, when client requires from the breakpoint that (preceding 50 minutes of live point) continues to play; Server can only return preceding 30 minutes content at most, can produce very large jump on the content.Therefore client need be known the scope that can carry out time shift operation, but present technology does not provide a kind of mechanism to indicate the scope how client obtained and indicated time shift operation.
Summary of the invention
The problem that the embodiment of the invention will solve provides a kind of time shift method for using and device, shows whether live TV stream supports time shift and exercisable time shift buffering area scope, and is implemented in the time shift buffering area scope and operates.
For achieving the above object, the embodiment of the invention proposes a kind of time shift operation method on the one hand, may further comprise the steps:
Obtain the time shifting parameter of said live TV stream, shifting parameter comprises when said: whether time shift, maximum time shift buffer size and current existing time shift buffer size; Or, whether time shift, maximum time shift buffer size;
The time shift progress bar of said live TV stream is created and safeguarded to shifting parameter when said;
In the scope of said time shift progress bar indication, operate;
Wherein, said when said shifting parameter create and safeguard and comprise the time shift progress bar of said live TV stream:
According to inserting mode shifter when whether receiving that current existing time shift buffering area is judged when live, comprising: when inserting live TV stream, during shifting parameter comprises current existing time shift buffer size that server returns when said, mode shifter for automatically the time; When inserting live TV stream, during shifting parameter do not comprise current existing time shift buffer size that server returns when said, mode shifter for manually the time;
When mode shifter is automatic when said during mode shifter; When request inserts said live TV stream; The live some coboundary that time corresponding is said time shift progress bar with said live TV stream; And according to live some time corresponding of said live TV stream and when said in the shifting parameter current existing time shift buffer size confirm the lower boundary of said time shift progress bar, create the time shift progress bar of said live TV stream thus;
During mode shifter, suspend said live TV stream when mode shifter is manual when said; Create and safeguard the time shift progress bar of said live TV stream;
Said mode shifter when automatic; Be specially a time shift buffering area on a plurality of user's share service devices, the user can carry out time shift operation to inserting former content, when the user is fast-forward at live; Can continue to use the time shift buffering area, shifting state in the time of also can leaving;
Said mode shifter when manual, the pausing operation that is specially through the user triggers time shift, and server begins interim time shift buffering area of Dynamic Maintenance in the breakpoint, terminal; The user can only just can have time shift operation after suspending; When the user is fast-forward at live, can delete the interim time shift buffering area of this user, the shifting state when user leaves; Also can keep the time shift buffering area, the user still can use this buffering area.
On the other hand, the embodiment of the invention also proposes a kind of time shift operation device, comprising:
Parameter acquisition module is used to obtain the time shifting parameter of live TV stream, and shifting parameter comprises when said: whether time shift, maximum time shift buffer size and current existing time shift buffer size; Or, whether time shift, maximum time shift buffer size;
The progress bar generation module is used for creating according to the time shifting parameter that said parameter acquisition module obtains the time shift progress bar of said live TV stream;
The time shift operation module is used in the scope of said time shift progress bar indication, operating;
Wherein, said progress bar generation module specifically is used for:
According to inserting mode shifter when whether receiving that current existing time shift buffering area is judged when live, comprising: when inserting live TV stream, during shifting parameter comprises current existing time shift buffer size that server returns when said, mode shifter for automatically the time; When inserting live TV stream, during shifting parameter do not comprise current existing time shift buffer size that server returns when said, mode shifter for manually the time;
When mode shifter is automatic when said during mode shifter; When request inserts said live TV stream; The live some coboundary that time corresponding is said time shift progress bar with said live TV stream; And according to live some time corresponding of said live TV stream and when said in the shifting parameter current existing time shift buffer size confirm the lower boundary of said time shift progress bar, create the time shift progress bar of said live TV stream thus;
During mode shifter, suspend said live TV stream when mode shifter is manual when said; Create and safeguard the time shift progress bar of said live TV stream;
Said mode shifter when automatic; Be specially a time shift buffering area on a plurality of user's share service devices, the user can carry out time shift operation to inserting former content, when the user is fast-forward at live; Can continue to use the time shift buffering area, shifting state in the time of also can leaving;
Said mode shifter when manual, the pausing operation that is specially through the user triggers time shift, and server begins interim time shift buffering area of Dynamic Maintenance in the breakpoint, terminal; The user can only just can have time shift operation after suspending; When the user is fast-forward at live, can delete the interim time shift buffering area of this user, the shifting state when user leaves; Also can keep the time shift buffering area, the user still can use this buffering area.
The technical scheme of the embodiment of the invention has the following advantages; Because adopted a kind of time shift method for using and device; Thereby,, make client can time shift progress bar and real-time status variation thereof be presented to the user with time shift ability and the time shift buffering area current state notice client that server is supported; Reach ease for use, the accuracy of strengthening user's time shift operation, improved the effect of user's experience.
Description of drawings
The schematic flow sheet of a kind of time shift operation method that Fig. 1 provides for the embodiment of the invention;
Three kinds of sketch mapes that obtain the method for maximum time shift and maximum time shift buffer parameters that Fig. 2 provides for the embodiment of the invention;
Fig. 3 is in the embodiment of the invention one, relevant signaling process schematic flow sheet under the mode shifter in the time of automatically;
Fig. 4 is in the embodiment of the invention one, the variation sketch map of the time shift progress bar of clients corresponding under the mode shifter in the time of automatically;
Fig. 5 is in the embodiment of the invention one, relevant signaling process schematic flow sheet under the mode shifter in the time of manually;
Fig. 6 is in the embodiment of the invention one, the variation sketch map of the time shift progress bar of clients corresponding under the mode shifter in the time of manually;
Fig. 7 is in the embodiment of the invention three, a kind of structural representation of time shift operation device.
Embodiment
The embodiment of the invention has proposed a kind of time shift method for using and device, shows whether live TV stream supports time shift and exercisable time shift buffering area scope, and is implemented in the time shift buffering area scope and operates.
In the embodiment of the invention, the time shift buffer length is limited, follows first in first out, the position of the always live point in its coboundary, and after buffering area overflowed, lower boundary and coboundary would be translation in time together.Client comprises whether time shift, time shift maximum buffer and current existing time shift buffer size through getting access to the time shift relevant information, can oneself create and safeguard that the real-time status of a time shift progress bar changes, and indicates exercisable time shift scope.
As shown in Figure 1, the schematic flow sheet of a kind of time shift operation method that provides for the embodiment of the invention may further comprise the steps:
Step S101, obtain the time shifting parameter of live TV stream.
As shown in Figure 2, the embodiment of the invention has been enumerated three kinds of methods of obtaining whether time shift and time shift maximum buffer parameter.Client only need obtain to get final product through a kind of mode wherein, when obtaining this parameter through more than one modes simultaneously, and when contradictory, is as the criterion with the up-to-date parameter value that obtains.
Whether time shift parameter acquiring method 1, the real time control protocol RTSP through Streaming Media indicate time shift and maximum time shift buffer parameters in the PLAY request response that inserts live TV stream.
Real-time stream media protocol (RTSP) is a kind of agreement that Streaming Media is controlled in real time of ietf definition.This agreement adopts customer end/server mode, is used for setting up and consulting to fail to be convened for lack of a quorum in real time words at the client and server end, and provides various control commands are carried out in the broadcast of Streaming Media, mainly comprises as issuing orders:
SETUP: let server give the flow distribution resource, start RTSP and connect.
PLAY: start the transfer of data that SETUP divides flow.
PAUSE: stop stream temporarily, and do not discharge server resource.
TEARDOWN: discharge the resource of stream, the RTSP connection stops.
Time shift parameter acquiring method 2, when inserting the live TV stream session and set up, obtain SDP through the DESCRIBE method of RTSP, whether shifting parameter when wherein comprising indicates time shift and maximum time shift buffering area.
Session Description Protocol SDP is a kind of form (agreement) that is used for conversation description; It is not a host-host protocol; Be not included among the encoding and decoding of medium yet; But being used for the notification protocol of the pass-along message between differing transmission protocols, its main purpose is the initial work that solves Multimedia session notice, invitation and session.It can be used in RTSP, session initiation protocol, and (The Session Initiation Protocol is SIP) etc. in the session control protocol.
Comprise two-layer in the SDP message: session layer and Media layer.The information that possibly comprise one or more Media layer in conversation description.The substance of SDP message comprises information such as the title, target, activity time, bandwidth of session, constitutes type, form, the host-host protocol of the medium of session, and the information of relevant media delivery, address etc.
Time shift parameter acquiring method 3, inserting before the live TV stream session sets up, client is through downloading or other modes can access SDP file, and whether shifting parameter sometimes wherein indicates time shift and maximum time shift buffering area.
The time shift parameter acquiring that it is pointed out that above-mentioned time shift parameter acquiring method 3 occurs in request and inserts before the live TV stream, and this is the possibility of of embodiment of the invention shifting parameter when obtaining, and belongs to protection scope of the present invention equally.
The time shifting parameter that gets access to by the way comprises: whether whether time shift, time shift maximum buffer time shift and time shift maximum buffer are metastable values (possibly in a program or channel, can not change in a very long time); Can use a parametric representation; Real time control protocol through Streaming Media obtains; Like RTSP, promptly above-mentioned method shown in Figure 21; Also can before playing, get access to through other modes, like SDP, promptly above-mentioned method shown in Figure 22 and 3.
Whether step S102, basis receive current existing time shift buffer parameters, mode shifter when judging when access is live.
In the parameter that when inserting live TV stream, obtains, whether carry current existing time shift buffer size, identified the kind of the time-shift service that server provided, be specially:
Through when inserting live TV stream, get access to the time when comprising current existing time shift buffer size in the shifting parameter, the mode shifter when kind of time-shift service is automatic changes step S103 over to;
Through when inserting live TV stream, get access to the time when not comprising current existing time shift buffer size in the shifting parameter, the mode shifter when kind of time-shift service is manual changes step S106 over to.
More than two kinds of time-shift service patterns belong to the PSS time-shift service, the PSS time-shift service is meant that the live content for the PSS mode of unicast provides the time-shift service characteristic, has comprised 2 kinds of scenes:
Automatic time shift---a time shift buffering area on a plurality of user's share service devices, the user can carry out time shift operation to inserting former content.When the user is fast-forward at live, can continue to use the time shift buffering area, shifting state in the time of also can leaving.
Manually time shift---the pausing operation through the user triggers time shift, and server begins interim time shift buffering area of Dynamic Maintenance in the breakpoint, terminal, and like this, the user can only just can have time shift operation after suspending.When the user is fast-forward at live, can delete the interim time shift buffering area of this user, the shifting state when user leaves; Also can keep the time shift buffering area, the user still can use this buffering area.
For the size of current existing time shift buffering area, be a value with the live TV stream dynamic change, can only, the user just can obtain when being linked into live TV stream; And whether have the time shift buffering area when inserting according to the user, can judge the time shift mode (automatic/hand) that server is supported, for different time mode shifters, the processing of client is different fully.
Step S103, according to the time shifting parameter create and safeguard the time shift progress bar of live TV stream.
When request inserts said live TV stream; Client is obtaining the current existing time shift buffer size of automatic time shift; The live some coboundary that time corresponding is the time shift progress bar with live TV stream; And the lower boundary of confirming said time shift progress bar according to the live some time corresponding and the current existing time shift buffer size of said live TV stream; Promptly deduct current existing time shift buffer size and obtain lower boundary, thereby create out a time shift progress bar, but indicate the scope of time shift through live point (coboundary).
At this moment, the current broadcast point in the time shift progress bar is the live point of live TV stream, the coboundary of corresponding time shift progress bar.
Afterwards; Client need be safeguarded the state variation of time shift progress bar voluntarily: on the basis of current existing time shift buffer values, do time accumulative total; And the value of continuous and maximum time shift buffering area compares; If aggregate-value has been equal to or greater than the value of maximum time shift buffering area, think that then the time shift buffering area overflows; The coboundary of time shift progress bar always follows live point to move forward; After the time shift buffering area overflows, lower boundary will with coboundary translation in time together.
Above-mentioned time shift progress bar begins to carry out normal play, and when the normal play live TV stream, safeguards the time shift progress bar after creating and finishing.Current broadcast point is live point, corresponds to the coboundary of time shift progress bar.If user's decision begins to carry out time shift operation, then change step S104 over to.
Step S104, in the scope of time shift progress bar indication, operate.
The time shifting state under, client can be carried out time shift operation in the time shift scope, comprise time-out, play, stop, operation such as F.F., rewind down, location.
As previously mentioned, automatically the time under the mode shifter, shifting state when client can enter into through time-out, rewind down or location.
Pass through aforesaid operations; The live point of the no longer certain corresponding live TV stream of current broadcast point in the time shift progress bar; The coboundary of supposing the time shift progress bar is t1; The time that in play response, obtains current broadcast point is t2, and then current broadcast point be (t1-t2) with the distance of coboundary on the time shift progress bar, equals all the time when time that point is play and the time difference between the live point.
Shifting parameter when whether server can be selected to carry in above-mentioned request response, the time shifting parameter in maximum time shift buffering area and current existing time shift buffer size all be optional.After client obtains these parameters, can calibrate shifting parameter and progress bar when local, safeguard the state of time shift progress bar simultaneously, detailed process is following:
The time shifting state, client is safeguarded the time shift progress bar voluntarily.For example: continue the time shift progress bar is done time accumulative total according to the current time, and constantly and maximum time shift buffering area compare, judge whether the time shift buffering area can overflow; Moved with the current time (live point) coboundary of time shift progress bar; Before buffering area overflowed, the progress bar lower boundary was constant, and buffering area overflows the back lower boundary also will be with the coboundary translation; If the current halted state that is in also need be safeguarded the position relation of breakpoint and time shift progress bar, but the indication breakpoint in the time shift scope still outside, the time relationship of breakpoint and time shift progress bar is to indicate whether continuing broadcast from the breakpoint again; Or the like.
After aforesaid operations was accomplished, client can select to get back to the live state of live TV stream, changes step S105 over to.
Step S105, return live state, and continue the time shift progress bar.
Through a key put in place, mode such as F.F., location can turn back to live point.After turning back to live state, client still will continue to safeguard the time shift progress bar, and method is said with step S103.
Need further be pointed out that; After returning live state, shifting state in the time of can also entering into through time-out, rewind down or location again is because the time shift progress bar is continued to safeguard after returning live state; So need not to create again again the time shift progress bar, change step S104 over to.
Step S106, time-out live TV stream.
In the process that inserts live TV stream; Obtain the time comprise in the shifting parameter and support time shift and maximum time shift buffer size; But do not comprise current existing time shift buffer size, then the server support is manual time shift, in this case; After access is live, do not have the time shift progress bar to generate, need pausing operation could activate the generation of time shift progress bar.
Client initiates to suspend request under live state, time shift head and each parameter thereof are optional in the server response.
Need further be pointed out that; According to actual setting; Shifting parameter obtained when the client in the time of manually under the mode shifter also can be carried out in this step; Be shifting parameter when carrying in the time-out request responding information of server in this step, thereby client is obtained the information of maximum time shift buffer size, the adjustment of this time that gets parms belongs to protection scope of the present invention equally.
Step S107, according to the time shifting parameter create and safeguard the time shift progress bar of live TV stream.
Client is created the time shift progress bar, shifting state when getting into simultaneously after receiving and suspending response; The time shifting state, safeguard its state according to the value and the local zone time of maximum time shift buffering area: for example, receiving when suspending response; Current existing time shift buffer length is 0; From then on begin accumulative total on the basis, be accumulated to and be equal to or greater than maximum time shift buffering area, the time shift buffering area overflows when thinking; Advance in the coboundary of time shift progress bar (live point) in time; The breakpoint is an original position of time shift progress bar, can regard a reference point of progress bar as, before the time shift buffering area overflows; It is the lower boundary of progress bar; After the time shift buffering area overflowed, along with the translation of progress bar, it was also strengthening with the distance of progress bar in time.
Above-mentioned time shift progress bar changes step S108 over to after creating and finishing.
Step S108, in the scope of time shift progress bar indication, operate.
The time shifting state under, client can be carried out time shift operation in the time shift scope, comprise time-out, play, stop, operation such as F.F., rewind down, location.
As previously mentioned, under the mode shifter, mode shifter in the time of then can only getting into through time-out generates the time shift progress bar manually the time.
Pass through aforesaid operations; The live point of the no longer certain corresponding live TV stream of current broadcast point in the time shift progress bar; The coboundary of supposing the time shift progress bar is t1; The time that in play response, obtains current broadcast point is t2, and then current broadcast point be (t1-t2) with the distance of coboundary on the time shift progress bar, equals all the time when time that point is play and the time difference between the live point.
Shifting parameter when whether server can be selected to carry in above-mentioned request response, the time shifting parameter in maximum time shift buffering area be optional.After client obtains these parameters, can calibrate shifting parameter and progress bar when local, safeguard the state of time shift progress bar simultaneously, detailed process is following:
The time shifting state, client is safeguarded the time shift progress bar voluntarily.For example: continue the time shift progress bar is done time accumulative total according to the current time, and constantly and maximum time shift buffering area compare, judge whether the time shift buffering area can overflow; Moved with the current time (live point) coboundary of time shift progress bar; Before buffering area overflowed, the progress bar lower boundary was constant, and buffering area overflows the back lower boundary also will be with the coboundary translation; If the current halted state that is in also need be safeguarded the position relation of breakpoint and time shift progress bar, but the indication breakpoint in the time shift scope still outside, the time relationship of breakpoint and time shift progress bar is to indicate whether continuing broadcast from the breakpoint again; Or the like.
After aforesaid operations was accomplished, client can select to get back to the live state of live TV stream, changes step S109 over to.
Step S109, return live state, continue to safeguard or deletion time shift progress bar.
Return to live state, can delete the time shift progress bar, create again after suspending next time again, method is with step S107; Also can continue to keep the time shift progress bar, method is with step S108.
After this step is accomplished, promptly return live state after, if shifting state when the user hopes to get into again, then according in this step to the operating result of time shift status bar, be divided into following two kinds of situation:
If when the operation of adopting in this step is deletion time shift progress bar, change step S106 over to;
Pausing operation through step S106 activates the visioning procedure of time shift status bar, creates the time shift progress bar again.
Because in step before, obtained to create the required parameter information of time shift progress bar, if the time shift parameter information is retained, then this step can directly get into the flow process of creating the time shift progress bar; If be not retained, then client initiates to suspend request under live state, and feedback time shift head and each parameter thereof in the server response are in order to set up the time shift progress bar.
If the operation of adopting in this step is when continuing to safeguard the time shift progress bar, to change step S110 over to.
Step S110, time-out live TV stream.
Shifting state when getting into through this step, thus step S108 can be returned, in the scope of time shift progress bar indication, operate.
Need be pointed out that further that according to actual setting, in the above-mentioned steps, client can comprise concrete time shifting parameter from each message feedback that server receives, in order to safeguard, to proofread and adjustment time shift progress bar, this belongs to protection scope of the present invention equally.
Below in conjunction with accompanying drawing and embodiment, specific embodiments of the invention describes in further detail:
The embodiment of the invention one, the time shift operation method of shifting parameter when transmitting through in RTSP, expanding the Time-shift head.
In the present embodiment; Definition of T ime-shift head in RTSP; The information of carrying comprises whether supporting time shift, maximum time shift buffering area and current existing buffer length; Realize through two parameters: maximum time shift buffering area and current existing time shift buffering area are used in Play or the Pause response.Its syntax format is following:
Time-shift＝″Time-shift″:parameter?CRLF
parameter＝″；″″Max_buff″″＝″1*value1
/″；″″Curr_buff″(″＝″1*value1)/(″:″″time-type″″＝″1*time″-″1*time)
Value1=1*nDIGIT [". " fraction]; S (n＞0, integer)
time-type＝″npt″/″clock″/″smpte″
time＝NPT-time/Absolute?time/SMPTE?Relative?Timestamps
Wherein, Max-buff and Curr-buff are to be unit with the time second, can use a value representation a period of time, and this value is starting point with the current live TV point, expression a period of time forward; Cur-buff also can be a time period information that is made up of a time started and concluding time in addition, and this mode can use three kinds of time representation methods among the RTSP to represent again: NPT-time, Absolute time and SMPTE Relative Timestamps.
Illustrate respectively below.
(1) with the method for expressing of a time value
Max-buff＝3600，Curr-buff＝1000
(2) Curr-buff is with the method for two value representations
NPT-time:Max-buff=3600 Curr-buff:npt=500.5-1500; // with range with relative 0 point of identical NPT
Absolute?time:Max-buff＝3600?Curr-buff:clock＝20071108T143720.25Z-20071108T145010.65Z
SMPTE:Max-buff=3600 Curr-buff:smpte=10:07:00-10:37:33:05.01//use identical relative 0 point of SMPTE with range
The implication and the method for using of above-mentioned Time-shift head and two parameters:
When client inserts live TV stream,, represent that then server do not support time-shift service, otherwise the expression server is supported time-shift service if do not carry the Time-shift head in the play response.
The concrete implication of Time-shift inner parameter is following:
(1) Max-buff:Max-buff equals 0, and expression is not supported; Max-buff is not equal to 0, expresses support for time shift, and the maximum buffer of time shift equals Max-buff.
(2) Curr-buff: implication is relevant with current state (live/time shift).When inserting live TV stream, if in the play response, carried the Time-shift head, but there is not the Curr-buff item, then expression needs the user to press the pause button could to trigger the establishment of time shift progress bar, shifting state during entering; If the Curr-buff item is arranged, represent that then the user has available time shift buffering area, the span of Curr-buff [0, Max-buf], the shifting state when user can get at any time when inserting live TV stream.After the shifting state, the user allows operations such as location, time-out, forward/backward when getting into, and this moment, Curr-buff was an option, and this is arranged, and client then can be used to revise the current buffer size value of client.
After client is created the time shift progress bar; Because the time shift buffering area is followed live point always; Client can be according to the size of initial existing time shift buffering area; The state of do-it-yourself time accumulative total real-time servicing progress bar when existing time shift buffer size during totally more than or equal to maximum time shift buffering area, can think that the time shift buffering area of server begins to overflow; Time shift progress bar and the real time shift buffering area of server side that client oneself cumulative time safeguards may be variant; Also possibly can change by maximum time shift buffering area; When the user operates just like time-out, location, forward/backward etc.; In the play response, return Max-buff and Curr-buff, client can be worth with this revises local time shifting parameter, demonstrates more accurate progress bar.
Based on above-mentioned time-shift head, signaling during judgement behind the mode shifter and terminal processes flow process are following:
A, automatic time shift mode treatment flow process:
Suppose the automatic time shift of server support, maximum time shift buffering area is 3600 seconds; Play response through RTSP gets access to the time shift characterisitic parameter; Client has available time shift buffering area when inserting.
If client is not supported time shift, then the Time-shift head in the Play response is not processed; If client is also supported time shift, the time shift progress bar is created and safeguarded to shifting parameter in the time of then need utilizing.Fig. 3 is respectively the variation of the time shift progress bar of relevant signaling process flow process of automatic time shift and clients corresponding with Fig. 4, and in conjunction with two figure, time shift mode treatment flow process is following automatically:
Step S301, request insert live TV stream.
Client is initiated the play request constantly at T0 and is linked into programme televised live, and for example, command content is specially: Play rttp: //example.com/content1.3gp.
The response message of step S302, reception server, shifting parameter during extraction.
As to receive response message be 200 OK Session:XXXX Time-shift:Max-buff=3600 Curr_buff=400; Show that then server response carries the Time-shift head; Maximum time shift buffering area Max-buff=3600 second, existing time shift buffering area Curr-buff=400 second.
Step S303, according to the time shifting parameter create the time shift progress bar.
Client is created an initial time shift progress bar according to Max-buff and Curr-buff, indicates to carry out time shift operation in preceding 400 seconds at current live TV point.
Afterwards, client needs oneself to safeguard the variation of time shift progress bar, and the scope that gets final product time shift at the uniform velocity is increased to T1 constantly from T0 in time, if the time shift buffering area has and overflows, then progress bar integral body will be along with live some time-shifting.
Step S304, request suspend live TV stream.
At T1 constantly, the user presses because of certain reason and suspends live TV stream.It is pointed out that suspending is preferred embodiment provided by the present invention, other can reach the operation of same effect, like operations such as rewind down, location, also belong to protection scope of the present invention.
Step S305, reception suspend response message.
As to receive response message be OK Session:XXXX Time_shift:Curr_buff=1000.
Time-shift in the response and wherein Max-buff and Curr-buff are options.If carried this two parameters, the parameter value that use after client is received and this locality compares, and correcting local parameter and time shift progress bar.Only return Curr-buff=1000 constantly like T1 among the figure, then client is 1000 seconds with the Curr-buff correction of this locality.
Step S306, carry out live TV stream operation according to the time shift progress bar.
Behind the time-out, shifting state during entering.The time shifting state under, client is safeguarded the time shift progress bar voluntarily, and is supported in the operation in the time shift scope, like F.F., rewind down, location, time-out etc.
Live TV stream is returned in step S307, request.
At T2 constantly, client returns to live with the Play command request.
Step S308, reception response message.
As to receive response message be OK Session:XXXX Time_shift:Curr_buff=1800, in the play response, returns Curr-buff=1800 second.
Step S309 returns live state, safeguards the time shift progress bar.
The local time shift progress bar of client calibration, the live state of packing into simultaneously, and continue to safeguard the time shift progress bar.
B, manual time shift mode treatment flow process:
Suppose the manual time shift of server support, promptly client does not have available time shift buffering area when inserting, and has only the establishment that when the user suspends, just triggers the time shift progress bar; Maximum time shift buffering area is 3600 seconds, obtains the time shift characterisitic parameter through the RTSP signaling.
If client is not supported time shift, then the Time-shift head in the Play response is not processed; If client is also supported time shift, the time shift progress bar is created and safeguarded to shifting parameter when then after suspending, utilizing.The time shift progress bar of Fig. 5 relevant signaling process flow process and clients corresponding when being manual time shift respectively with Fig. 6.
Step S501, request insert live TV stream.
Client is initiated the play request constantly at T0 and is linked into programme televised live, and for example, command content is specially: Play rttp: //example.com/content1.3gp.
The response message of step S502, reception server, shifting parameter during extraction.
The Time-shift head is carried in server response, is 200 OK Session:XXXX Time-shift:Max-buff=3600 as receiving response message, maximum time shift buffering area Max-buff=3600 second.Client is not according to carrying current existing time shift size Curr-buff in the response message, what can judge the server support is manual time shift, need not safeguard the time shift progress bar so get into live state.
Play under step S503, the live state.
Step S504, request suspend live TV stream.
Up to T1 constantly, client initiates to suspend request.
Step S505, reception suspend response message.
As to receive response message be OK Session:XXXX Time_shift:Curr_buff=0.
The Curr-buff that returns in the response is an option.
Step S506, according to the time shifting parameter create the time shift progress bar.
Client is known to be manual time shift, then after receiving the time-out response, creates a time shift progress bar voluntarily, and initial Curr-buff is 0; Shifting state when getting into simultaneously, and begin to safeguard the time shift progress bar, progress bar accumulates; Move in time the coboundary; When being increased to, think that buffering area overflows, corresponding progress bar integral body translation in time more than or equal to the time shift maximum buffer.Whether the time relationship of display halt point and time shift progress bar can begin from the breakpoint to continue to play with the prompting user.
Step S507, the time shifting state under, in time shift progress bar scope, operate.
At T2 constantly, recover to play or carry out other positioning action from the breakpoint, in response, return Curr-buff=1000, client is proofreaied and correct time shifting parameter and the progress bar of this locality according to this parameter, continues to safeguard the time shift progress bar.
Live TV stream is returned in step S508, request.
At T3 constantly, client-requested is returned live.
Step S509, reception response message.
As to receive response message be OK Session:XXXX Time_shift:Curr_buff=1800, in the play response, returns Curr-buff=1800 second.
Step S510, receive response after, client cancellation time shift progress bar, time shift progress bar length becomes 0.
The embodiment of the invention two gets access to the time shift method for using of whether supporting time shift and time shift maximum buffer through SDP.
Need in SDP, expand an attribute Timeshift, this attribute can only be applied in session layer for this reason, and its form is following:
a＝Timeshift:<Timeshift_Maxbuff>
Timeshift_Maxbuff＝1*value；s
Value=1*n DIGIT [". " fraction]; S (n＞0, integer)
Wherein Timeshift_Maxbuff is unit with the second, and concrete implication is:
(1) if do not have this attribute of a=timeshift or indication a=timeshift:0 among the SDP, then time-shift service is not supported in expression
=0, then express support for time shift, the maximum buffer of time shift is Timeshift_Maxbuff second.
Be convenient explanation, be exemplified below:
v＝0
o＝ghost?2890844526?2890842807?IN?IP4?192.168.10.10
s＝3GPP?Unicast?SDP?Example
i＝Example?of?Unicast?SDP?file
u＝http://www.infoserver.com/ae600
e＝ghostmailserver.com
c＝IN?IP4?0.0.0.0
t＝0?0
A=range:npt=now-// expression is a programme televised live
A=timeshift:3600 // support time shift, time shift maximum buffer 3600s
//a=timeshift:0 // do not support time shift
Client gets access to whether support time shift and maximum time shift buffering area through SDP, still need use the Curr-buff item among the extension header time-shift of RTSP among the embodiment 1, and the Max-buff item can.
Based on the SDP of above-mentioned expansion Timeshift attribute instruction, signaling during judgement behind the mode shifter and terminal processes flow process are similar with the above-mentioned embodiment of the invention one, no longer separately detailed description.
If SDP and RTSP conflict, be as the criterion with the parameter of up-to-date acquisition.As: provided the value of maximum time shift buffering area among the SDP file, in the Play of RTSP request, also provided this value, but the two has been inconsistent, because RTSP upgrades than SDP file in time, so be as the criterion with RTSP; Client gets access to time shift buffering area maximum through SDP, does not carry the time-shift head during access among the RTSP, and then client thinks that server supports time shift, but could trigger the establishment of time shift progress bar after needing the user to suspend.
As shown in Figure 7, be the embodiment of the invention three, a kind of structural representation of time shift operation device comprises:
Parameter acquisition module 1 is used to obtain the time shifting parameter of live TV stream;
Progress bar generation module 2 is used for creating according to the time shifting parameter that parameter acquisition module 1 obtains the time shift progress bar of live TV stream;
Time shift operation module 3 is used in the scope of the time shift progress bar indication that progress bar generation module 2 generates, operating.
Wherein, parameter acquisition module 1 specifically comprises:
Submodule 11 is sent in request, is used to send the request that inserts live TV stream;
Parameter acquiring submodule 12 is used for receiving request and sends submodule 11 and send the request responding information, and shifting parameter when obtaining;
Pattern is judged submodule 13, mode shifter when being used for judging according to the time shifting parameter that parameter acquiring submodule 12 obtains.
Wherein, parameter acquisition module 1 also comprises:
File is downloaded submodule 14, is used for before inserting live TV stream, downloading SDP file.
Wherein, progress bar generation module 2 specifically comprises:
Activate submodule 21, be used to activate the operation that generates the time shift progress bar;
First safeguards submodule 22, is used to safeguard the time shift progress bar.
Wherein, time shift operation module 3 specifically comprises:
Second safeguards submodule 31, is used for after carrying out time shift operation, according to time shift parameter maintenance time shift progress bar.
Deletion submodule 32 is used for manually the time under the mode shifter, return live TV stream after, deletion time shift progress bar
The technical scheme of the embodiment of the invention has the following advantages; Because adopted a kind of time shift method for using and device; Thereby,, make client can time shift progress bar and real-time status variation thereof be presented to the user with time shift ability and the time shift buffering area current state notice client that server is supported; Reach ease for use, the accuracy of strengthening user's time shift operation, improved the effect of user's experience.
Through the description of above execution mode, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but the former is better execution mode under a lot of situation.Based on such understanding; The part that technical scheme of the present invention contributes to prior art in essence in other words can be come out with the embodied of software product; This computer software product is stored in the storage medium, comprise some instructions with so that a station terminal equipment (can be mobile phone, personal computer; Server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be looked protection scope of the present invention.
Claims (16)
1. a time shift operation method is characterized in that, may further comprise the steps:
Obtain the time shifting parameter of live TV stream, shifting parameter comprises when said: whether time shift, maximum time shift buffer size and current existing time shift buffer size; Or, whether time shift, maximum time shift buffer size;
The time shift progress bar of said live TV stream is created and safeguarded to shifting parameter when said;
In the scope of said time shift progress bar indication, operate;
Wherein, said when said shifting parameter create and safeguard and comprise the time shift progress bar of said live TV stream:
According to inserting mode shifter when whether receiving that current existing time shift buffering area is judged when live, comprising: when inserting live TV stream, during shifting parameter comprises current existing time shift buffer size that server returns when said, mode shifter for automatically the time; When inserting live TV stream, during shifting parameter do not comprise current existing time shift buffer size that server returns when said, mode shifter for manually the time;
When mode shifter is automatic when said during mode shifter; When request inserts said live TV stream; The live some coboundary that time corresponding is said time shift progress bar with said live TV stream; And according to live some time corresponding of said live TV stream and when said in the shifting parameter current existing time shift buffer size confirm the lower boundary of said time shift progress bar, create the time shift progress bar of said live TV stream thus;
During mode shifter, suspend said live TV stream when mode shifter is manual when said; Create and safeguard the time shift progress bar of said live TV stream;
Said mode shifter when automatic; Be specially a time shift buffering area on a plurality of user's share service devices, the user can carry out time shift operation to inserting former content, when the user is fast-forward at live; Can continue to use the time shift buffering area, shifting state in the time of also can leaving;
Said mode shifter when manual, the pausing operation that is specially through the user triggers time shift, and server begins interim time shift buffering area of Dynamic Maintenance in the breakpoint, terminal; The user can only just can have time shift operation after suspending; When the user is fast-forward at live, can delete the interim time shift buffering area of this user, the shifting state when user leaves; Also can keep the time shift buffering area, the user still can use this buffering area.
2. time shift operation method according to claim 1 is characterized in that the said time shifting parameter that obtains live TV stream is specially:
Insert said live TV stream through real time control protocol RTSP request, and receive the response of shifting parameter when carrying, obtain the time shifting parameter of said live TV stream; Or,
Describe agreement SDP through queued session, and receive the response of the said SDP of shifting parameter when carrying, obtain the time shifting parameter of said live TV stream; Or,
Before described request inserts live TV stream, obtain comprise said live TV stream the time shifting parameter SDP file.
3. time shift operation method according to claim 1; It is characterized in that, when mode shifter is automatic when said during mode shifter, in said time shift progress bar; Current broadcast point is the live point of said live TV stream; The coboundary of corresponding said time shift progress bar, the said time shift progress bar of safeguarding live TV stream is specially:
More said time shift progress bar size and said maximum time shift buffer size;
When said time shift progress bar size during less than said maximum time shift buffer size, said lower boundary is constant, and move with the live point of said live TV stream said coboundary; Or,
When said time shift progress bar size during more than or equal to said maximum time shift buffer size; Move with the live point of said live TV stream said lower boundary and said coboundary, equals said maximum time shift buffer size with lower boundary and the size between the coboundary that guarantees said time shift progress bar.
4. time shift operation method according to claim 1 is characterized in that, when mode shifter is manual when said during mode shifter, said establishment is also safeguarded the time shift progress bar of live TV stream, is specially:
With said breakpoint is the lower boundary of said time shift progress bar, and the coboundary so that the live point of said live TV stream is said time shift progress bar generates said time shift progress bar;
More said time shift progress bar size and said maximum time shift buffer size;
When said time shift progress bar size during less than said maximum time shift buffer size, said lower boundary is constant, and move with the live point of said live TV stream said coboundary; Or,
When said time shift progress bar size during more than or equal to said maximum time shift buffer size; Move with the live point of said live TV stream said lower boundary and said coboundary, equals said maximum time shift buffer size with lower boundary and the size between the coboundary that guarantees said time shift progress bar.
5. time shift operation method according to claim 1 is characterized in that, saidly in the scope of time shift progress bar indication, operates, and is specially:
In the scope of said time shift progress bar indication, suspend, play, stop, F.F., rewind down, location or return at least a operation in the live state.
6. like the said time shift operation method of claim 5, it is characterized in that, saidly in the scope of said time shift progress bar indication, operate, also comprise:
Continue to safeguard said time shift progress bar.
7. like the said time shift operation method of claim 6, it is characterized in that said time shift progress bar is safeguarded in said continuation, specifically comprises:
More said time shift progress bar size and said maximum time shift buffer size;
When said time shift progress bar size during less than said maximum time shift buffer size, the lower boundary of said time shift progress bar is constant, and move with the live point of said live TV stream the coboundary of said time shift progress bar; Or,
When said time shift progress bar size during more than or equal to said maximum time shift buffer size; Move with the live point of said live TV stream the lower boundary of said time shift progress bar and coboundary, equals said maximum time shift buffer size with lower boundary and the size between the coboundary that guarantees said time shift progress bar.
8. like the said time shift operation method of claim 7, it is characterized in that said time shift progress bar is safeguarded in said continuation, also comprise safeguard current broadcast point in said time shift progress bar with the current broadcast point corresponding relation of time in live TV stream, be specially:
Keep time difference between the coboundary of said current broadcast point and said time shift progress bar to equal the live time difference of point between the pairing time of said pairing time of current broadcast point and said live TV stream.
9. like the said time shift operation method of claim 5, it is characterized in that,
When said time shift operation method when being automatic during mode shifter, the said live state of returning is specially:
Return the live point of live TV stream,
Continue to safeguard said time shift progress bar;
When said time shift operation method when being manual during mode shifter, the said live state of returning is specially:
Return the live point of live TV stream,
Continue to safeguard or delete said time shift progress bar.
10. like the said time shift operation method of claim 9, it is characterized in that when said time shift operation method when being automatic during mode shifter, the said live state of returning also comprises afterwards:
In the scope of the time shift progress bar indication that said continuation is safeguarded, operate.
11., it is characterized in that when said time shift operation method when being manual during mode shifter, the said live state of returning also comprises afterwards like the said time shift operation method of claim 9:
When the said live state of returning when continue safeguarding said time shift progress bar, suspend said live TV stream, in the scope of the time shift progress bar indication that said continuation is safeguarded, operate; Or,
When returning live state, suspend said live TV stream when said, create the time shift progress bar again, in the scope of the said time shift progress bar indication of creating again, operate for the said time shift progress bar of deletion.
12. a time shift operation device is characterized in that, comprising:
Parameter acquisition module is used to obtain the time shifting parameter of live TV stream, and shifting parameter comprises when said: whether time shift, maximum time shift buffer size and current existing time shift buffer size; Or, whether time shift, maximum time shift buffer size;
The progress bar generation module is used for creating according to the time shifting parameter that said parameter acquisition module obtains the time shift progress bar of said live TV stream;
The time shift operation module is used in the scope of the time shift progress bar indication that said progress bar generation module generates, operating;
Wherein, said progress bar generation module specifically is used for:
According to inserting mode shifter when whether receiving that current existing time shift buffering area is judged when live, comprising: when inserting live TV stream, during shifting parameter comprises current existing time shift buffer size that server returns when said, mode shifter for automatically the time; When inserting live TV stream, during shifting parameter do not comprise current existing time shift buffer size that server returns when said, mode shifter for manually the time;
When mode shifter is automatic when said during mode shifter; When request inserts said live TV stream; The live some coboundary that time corresponding is said time shift progress bar with said live TV stream; And according to live some time corresponding of said live TV stream and when said in the shifting parameter current existing time shift buffer size confirm the lower boundary of said time shift progress bar, create the time shift progress bar of said live TV stream thus;
During mode shifter, suspend said live TV stream when mode shifter is manual when said; Create and safeguard the time shift progress bar of said live TV stream;
Said mode shifter when automatic; Be specially a time shift buffering area on a plurality of user's share service devices, the user can carry out time shift operation to inserting former content, when the user is fast-forward at live; Can continue to use the time shift buffering area, shifting state in the time of also can leaving;
Said mode shifter when manual, the pausing operation that is specially through the user triggers time shift, and server begins interim time shift buffering area of Dynamic Maintenance in the breakpoint, terminal; The user can only just can have time shift operation after suspending; When the user is fast-forward at live, can delete the interim time shift buffering area of this user, the shifting state when user leaves; Also can keep the time shift buffering area, the user still can use this buffering area.
13., it is characterized in that said parameter acquisition module specifically comprises like the said time shift operation device of claim 12:
Submodule is sent in request, is used to send the request that inserts live TV stream;
The parameter acquiring submodule is used to receive the response message of shifting parameter when carrying, and shifting parameter when obtaining;
Pattern is judged submodule, mode shifter when being used for judging according to the time shifting parameter that said parameter acquiring submodule obtains.
14., it is characterized in that said parameter acquisition module also comprises like the said time shift operation device of claim 12:
File is downloaded submodule, is used for before inserting live TV stream, downloading SDP file.
15., it is characterized in that said progress bar generation module specifically comprises like the said time shift operation device of claim 12:
Activate submodule, be used to activate the operation that generates the time shift progress bar;
First safeguards submodule, is used to safeguard said time shift progress bar.
16., it is characterized in that said time shift operation module specifically comprises like the said time shift operation device of claim 12:
Second safeguards submodule, is used for after carrying out time shift operation, according to the said time shift progress bar of time shift parameter maintenance;
The deletion submodule is used for manually the time under the mode shifter, return the live state of said live TV stream after, delete said time shift progress bar.
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| CN200810090233XA CN101552796B (en) | 2008-03-31 | 2008-03-31 | Time-shifting operation method and device thereof |
| PCT/CN2009/070693 WO2009121257A1 (en) | 2008-03-31 | 2009-03-09 | Time-shift operation method and device |
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| CN102130936B (en) | 2010-08-17 | 2013-10-09 | 华为技术有限公司 | Method and device for supporting time shifting and look back in dynamic hyper text transport protocol (HTTP) streaming transmission scheme |
| CN102664032B (en) * | 2012-05-07 | 2015-08-12 | 乐视网信息技术（北京）股份有限公司 | A kind of playing progress rate adjustment bar of direct broadcast time-shift and control method thereof |
| CN103699583B (en) * | 2013-12-05 | 2018-08-03 | 乐视网信息技术（北京）股份有限公司 | A kind of method and electronic equipment for realizing direct broadcast time-shift |
| JP6337193B1 (en) * | 2017-12-14 | 2018-06-06 | 株式会社ドワンゴ | Server and program |
| CN109640126A (en) * | 2018-12-28 | 2019-04-16 | 北京奇艺世纪科技有限公司 | A kind of video broadcasting method, system and device and computer readable storage medium |
| CN114363710A (en) * | 2022-01-04 | 2022-04-15 | 上海哔哩哔哩科技有限公司 | Live broadcast watching method and device based on time shifting acceleration |
| CN114466216B (en) * | 2022-02-15 | 2023-11-03 | 上海哔哩哔哩科技有限公司 | Live broadcast room display method, server side and live broadcast client side |
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| CN1929596A (en) * | 2005-09-06 | 2007-03-14 | 中兴通讯股份有限公司 | Method and system for realizing time-moving television |
| CN1852421A (en) * | 2005-11-30 | 2006-10-25 | 华为技术有限公司 | Method for realizing switch-over between living broadcasting and time-shifting broadcasting |
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