CN101420577A - Storage method for multimedia data and method for accurately positioning playback position - Google Patents
Storage method for multimedia data and method for accurately positioning playback position Download PDFInfo
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Abstract
A multimedia data storage method and a method for precisely positioning the playback position relate to the multimedia technical field. The storage method stores an audio stream and a video stream in a data file A and simultaneously stores the storage position of a video key frame of the video stream in the data file A in an index file B, thereby leading the stored multimedia data to meet the data retrieval requirements by ordinary play, fast forward, fast rewind and other modes and being capable of playing at the same time of storing without the need of waiting for the finish of the file storage. The multimedia data storage method and the method for precisely positioning the playback position can carry out the real-time storage and the real-time playback of audio and video data and precisely position the playback position.
Description
Technical field
The present invention relates to multimedia technology field, a kind of storage means of multi-medium data and the accurately method of location playback position specifically.
Background technology
Along with the development of coding techniques and broadband network technology, the video stream media business has obtained developing rapidly.IPTV is as a kind of new application business, broad development and attention have been obtained, in the IPTV time shift system, need in the Streaming Media storage server, store real-time sound, video data, this just needs the good data organizational form to satisfy the specific demand of user.
Along with the raising of the network bandwidth, utilize the recording and broadcasting system in the video conferencing system of Ethernet, the carrier-class video monitoring system all need be stored a large amount of sounds in the Streaming Media storage server, the real-time video data are used for the client.
At present, to store the problem that sound, video mainly face by file format as follows for the Streaming Media storage server:
1, the sound of real-time storage, video data are before general format file of generation, can't carry out playback to file, for example: real-time storage T minute audio stream and video flowing are a file, in this T minute (before this file storage finishes) so, can not carry out playback to this file, this can not well support the requirement of some field real-time playbacks, as the real-time playback of monitoring video.
The algorithm of 2, F.F., rewind down searched key frame is not optimum, playback server will be limited by the file format of Streaming Media storage server storage sound, video, after the Streaming Media storage server adopted a kind of new stored in file format sound, video, playback server also will be done corresponding modify.
3, accurately navigate to put sometime playback relatively the difficulty.
Summary of the invention
At the defective that exists in the prior art, the object of the present invention is to provide a kind of storage means of multi-medium data and the accurate method of location playback position, sound, video data can real-time storage, real-time playback, can accurately locate playback position.
For reaching above purpose, the technical scheme that the present invention takes is:
A kind of storage means of multi-medium data, said multi-medium data comprises audio stream and video flowing, it is characterized in that: the concrete steps of storage are:
(1) when the Streaming Media storage server begins storing audio stream and video flowing, the Streaming Media storage server calls storage algorithm earlier and produce a data file A who is used for storing audio stream and video flowing and key frame of video that the is used for recorded video stream index file B at data file A deposit position on storage medium, and said key frame of video is the I frame;
(2) write file header information among the storage algorithm indexed file B, simultaneously time started, concluding time, affiliated video channel, the end-of-file mark information of filename, audio stream and the video flowing of data file A are write in the database, concluding time is temporarily inserted 0 and replaces, end-of-file mark information is not for finishing, said file header message length is fixed, and comprises version, video format, audio format, sample rate, time scale and six contents of out of Memory at least;
(3) storage algorithm receives the multi-medium data bag that sound, video capturing device are sent, and after removing packet header and forming audio frame and frame of video, audio frame and frame of video is write data file A; Its record format is: type, audio frame and the video frame content of rtp timestamp, audio frame and the frame of video of the length of audio frame and frame of video, audio frame and frame of video;
(4) storage algorithm judges whether current video frame is key frame of video I frame, if then obtain the position of current video frame in data file A, and execution in step (5) then, if not, then execution in step (3) continues to receive next multi-medium data bag;
(5) storage algorithm positional information that step (4) is obtained is written among the index file B, adds boundary marker 0x0d0a0d0a in the positional information back simultaneously;
(6) repeating step (3) is to the process of step (5), timeslice up to a file storage expires, to after date, storage algorithm is obtained the absolute time of Streaming Media storage server, and more the concluding time and the end-of-file mark information of corresponding audio stream and video flowing are in the new database: the absolute time of the Streaming Media storage server that storage algorithm is obtained and having finished.
A kind of method of accurate location playback position of multi-medium data, said multi-medium data is by the described method storage of claim 1, and it is characterized in that: the concrete steps of playback are:
(1) the Streaming Media storage server obtains the play start time point of user at the multimedia file of the appointment of terminal input;
(2) the Streaming Media storage server is searched the multimedia file of this appointment from database, if can not find, the Streaming Media storage server sends error message to terminal, notifies the multimedia file of user's appointment not exist;
(3) if find the multimedia file of this appointment, the Streaming Media storage server calls location algorithm and opens index file B, calculate the position Pb among the play start time point indexed file B, the Pb place of indexed file B obtains the positional information Pa of key frame of video in data file A then, and the algorithm that calculates Pb is: Pb=(play start time-file time started)/(end of file time-file time started) * (the file header message length of index file length-index file B);
(4) the Streaming Media storage server calls the multi-medium data of Pa position among the storage algorithm read data files A, transmits multimedia data to client;
(5) behind the multi-medium data in sending step (4), storage algorithm reads the positional information Pa of next key frame of video in data file A among the index file B successively, and repeating step (4) finishes up to whole transmission of the data of multimedia file.
The storage means of multi-medium data of the present invention and the accurate method of location playback position, sound, video data can real-time storage, real-time playback, can accurately locate playback position.
Description of drawings
The present invention has following accompanying drawing:
The application model configuration diagram of the professional occasion of the method for the storage means of Fig. 1 multi-medium data and accurate location playback position
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
The present invention has provided a kind of storage means of multi-medium data, and said multi-medium data comprises audio stream and video flowing, and the concrete steps of storage are:
(1) when the Streaming Media storage server begins storing audio stream and video flowing, the Streaming Media storage server calls storage algorithm earlier and produce a data file A who is used for storing audio stream and video flowing and key frame of video that the is used for recorded video stream index file B at data file A deposit position on storage medium, and said key frame of video is the I frame;
(2) write file header information among the storage algorithm indexed file B, simultaneously time started, concluding time, affiliated video channel, the end-of-file mark information of filename, audio stream and the video flowing of data file A are write in the database, concluding time is temporarily inserted 0 and replaces, end-of-file mark information is not for finishing, said file header message length is fixed, and comprises version, video format, audio format, sample rate, time scale and six contents of out of Memory at least;
(3) storage algorithm receives the multi-medium data bag that sound, video capturing device are sent, and after removing packet header and forming audio frame and frame of video, audio frame and frame of video is write data file A; Its record format is: type, audio frame and the video frame content of rtp timestamp, audio frame and the frame of video of the length of audio frame and frame of video, audio frame and frame of video;
(4) storage algorithm judges whether current video frame is key frame of video I frame, if then obtain the position of current video frame in data file A, and execution in step (5) then, if not, then execution in step (3) continues to receive next multi-medium data bag;
(5) storage algorithm positional information that step (4) is obtained is written among the index file B, adds boundary marker 0x0d0a0d0a in the positional information back simultaneously;
(6) repeating step (3) is to the process of step (5), timeslice up to a file storage expires, to after date, storage algorithm is obtained the absolute time of Streaming Media storage server, and more the concluding time and the end-of-file mark information of corresponding audio stream and video flowing are in the new database: the absolute time of the Streaming Media storage server that storage algorithm is obtained and having finished.Boundary marker 0x0d0a0d0a can also be other character string that is fit to, and boundary marker can adopt existing techniques in realizing.
On the basis of technique scheme, the present invention has provided the method for the accurate location playback position that gives a kind of multi-medium data, and said multi-medium data is to store by the storage means of above-mentioned multi-medium data, and the concrete steps of playback are:
(1) the Streaming Media storage server obtains the play start time point of user at the multimedia file of the appointment of terminal input;
(2) the Streaming Media storage server is searched the multimedia file of this appointment from database, if can not find, the Streaming Media storage server sends error message to terminal, notifies the multimedia file of user's appointment not exist;
(3) if find the multimedia file of this appointment, the Streaming Media storage server calls location algorithm and opens index file B, calculate the position Pb among the play start time point indexed file B, the Pb place of indexed file B obtains the positional information Pa of key frame of video in data file A then, and the algorithm that calculates Pb is: Pb=(play start time-file time started)/(end of file time-file time started) * (the file header message length of index file length-index file B);
(4) the Streaming Media storage server calls the multi-medium data of Pa position among the storage algorithm read data files A, transmits multimedia data to client;
(5) behind the multi-medium data in sending step (4), storage algorithm reads the positional information Pa of next key frame of video in data file A among the index file B successively, and repeating step (4) finishes up to whole transmission of the data of multimedia file.
Below in conjunction with Fig. 1, further specify the storage means of multi-medium data of the present invention and the method for accurate location playback position.As shown in Figure 1, the ip address of terminal client is 192.168.0.10, the ip address that sound, video monitoring are put a CH1 is 192.168.0.5, the ip address that sound, video monitoring are put two CH2 is 192.168.0.6, these two control points produce real-time audio frequency, video data and mail to the Streaming Media storage server (abbreviating storage server as) that the ip address is 192.168.0.155, receive and storage by the Streaming Media storage server, also be provided with database on the Streaming Media storage server.According to the above topology structure, the detailed process of using the method for the invention is as follows:
Suppose that sound, video monitoring put a CH1, sound, video monitoring and put two CH2 and all dispose, the co-current flow media store server sends real-time audio frequency, video data.It is as follows that the Streaming Media storage server is provided with situation: each file storage timeslice that CH1 is provided with is 1 hour, each file storage timeslice that CH2 is provided with is 1.5 hours, storage server is at absolute time beginning in 10003600 seconds storage of channel CH1, CH2 media data.
When CH1 the media data of absolute time 10003600 during (storing process of CH2 media data is identical with CH1, below only with the example that is stored as of CH1 media data) to storage server:
Storage server at first calls storage algorithm (this storage algorithm is kept in the storage services module for system call) and sets up data file A:A1.av, two empty files of index file B:A1.idx, wherein A1.av stores sound, video data, the position of A1.idx store video key frame in A1.av.
Storage algorithm writes file header information in A1.idx, simultaneously with the filename of A1.av: the time started of " A1.av " and audio stream and video flowing: 10003600, concluding time: 0, affiliated video channel: CH1, end-of-file mark information: finish to write in the database, finish and to replace with 1 if file has finished with 0 replacement.
Then, the multi-medium data bag that storage algorithm reception sound, video capturing device are sent, remove packet header and packet is carried out framing handle, form a complete audio frame and frame of video after, write A1.av, if storage algorithm judges that frame of video is a key frame, then storage algorithm also will write the position of this frame in A1.av in the A1.idx file, if first key frame of this document, the time that log file begins to store in database, its record format such as Fig. 1, the data-base recording form.
Repeat to receive packet, framing, storing audio frame and frame of video, recorded key frame position process, timeslice up to this document finishes, close A1.av and A1.idx, new database Chinese part concluding time mark more, for example, as shown in Figure 1, CH1 finishes 10007200 seconds file storage, and the A2.av of CH2 finished at 100010800 seconds.Prepare the storage of the next file of beginning, repeat above-mentioned storing process.
Continue to describe the accurately method of location playback duration point below, still be to be example with A1.av, suppose that the client wants to begin in 10005000 seconds to watch from absolute time the video record of A1.av record, the client sends playback request to storage server from the terminal client, and the form of this request can be rtsp: // 192.168.0.155/CH1_10005000.Storage server receives and parses that broadcast start time is 10005000, channel is CH1 after the request, navigate to the time period record clauses and subclauses that to play according to this channel and reproduction time, this example navigates to file A1.av, time started is 10003600 seconds, concluding time is 100072000 seconds, and document recording sign tab file is recorded and finished.
Open key frame index file A1.idx, obtain the file header message length L2 of file size L1 and A1.idx, obtain position Pb=(10005000-100036000)/(10007200-10003600) in the key frame indexed file of this time point * (L1-l2) according to following formula, obtain the positional information Pa of key frame of video in A1.av at the Pb place of A1.idx, open A1.av and navigate to the Pa position, sense data and timestamp send data to client by the relative spacing between the timestamp.
A3.av as shown in Figure 1, when the data file A of a timeslice does not also have storage not finish, its concluding time of writing down in database is 0 so, send rtsp as the user: // 192.168.0.155/CH2_100011000, storage server will navigate to file A3.av so, because A3.av this moment does not also store and finishes, its concluding time is 0, show that file does not also have end, at this moment storage server is got system time T1 as the end of file time, certainly T1 is greater than 100011000, does not exist otherwise reply this time period file.Get file size L1 and the file header message length L2 of A3.idx, obtain position Pb=(100011000-100010800)/(T1-100010800) in the key frame indexed file of this time point * (L1-L2) according to following formula, obtain the positional information Pa of key frame of video in A3.av at the Pb place of A3.idx, open A3.av and navigate to position Pa, sense data and timestamp send data to client by the relative spacing between the timestamp.
Characteristics of the present invention are as follows:
1, with the position separate storage of the key frame of multi-medium data and video data, can reduce the number of times that file pointer moves around in a file.
2, the file of recorded key frame position uses fixedly head length, can provide more useful information to the client when can make playback, as SDP information.
3, multi-medium data is deposited and is adopted fixing record format, and the key frame index file also adopts fixing record format, and the size of fixing every index record, and this is pinpoint basis.
4, in every access key frame record, add the fault-tolerance that the Boundary Recognition sign indicating number improves index file.
5, in database, safeguard the subordinate channel of each data file, the beginning recording time, information such as concluding time can improve the computational efficiency of storage algorithm, location algorithm.
6, the ranging formula that provides can accurately navigate to the Media Stream position of appointment.
File organization mode of the present invention is simply effective, and medium location accurately also not have to store under the situation of closing that finishes at current file, while can store playback, also accurate positioning media data of this method simultaneously.The index file record field adds that boundary marker has good fault-tolerant ability.This method can be widely used in system's real-time storage and playback scheme such as video monitoring, iptv time shift, video conference recorded broadcast.To some special applications modification a little, just can satisfy application demand simultaneously, have autgmentability preferably.
More than to provided by the present invention a kind of can instant playback the media data location mode and the method for accurately locating playback position be described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (2)
1. the storage means of a multi-medium data, said multi-medium data comprises audio stream and video flowing, it is characterized in that: the concrete steps of storage are:
(1) when the Streaming Media storage server begins storing audio stream and video flowing, the Streaming Media storage server calls storage algorithm earlier and produce a data file A who is used for storing audio stream and video flowing and key frame of video that the is used for recorded video stream index file B at data file A deposit position on storage medium, and said key frame of video is the I frame;
(2) write file header information among the storage algorithm indexed file B, simultaneously time started, concluding time, affiliated video channel, the end-of-file mark information of filename, audio stream and the video flowing of data file A are write in the database, concluding time is temporarily inserted 0 and replaces, end-of-file mark information is not for finishing, said file header message length is fixed, and comprises version, video format, audio format, sample rate, time scale and six contents of out of Memory at least;
(3) storage algorithm receives the multi-medium data bag that sound, video capturing device are sent, and after removing packet header and forming audio frame and frame of video, audio frame and frame of video is write data file A; Its record format is: type, audio frame and the video frame content of rtp timestamp, audio frame and the frame of video of the length of audio frame and frame of video, audio frame and frame of video;
(4) storage algorithm judges whether current video frame is key frame of video I frame, if then obtain the position of current video frame in data file A, and execution in step (5) then, if not, then execution in step (3) continues to receive next multi-medium data bag;
(5) storage algorithm positional information that step (4) is obtained is written among the index file B, adds boundary marker 0x0d0a0d0a in the positional information back simultaneously;
(6) repeating step (3) is to the process of step (5), timeslice up to a file storage expires, to after date, storage algorithm is obtained the absolute time of Streaming Media storage server, and more the concluding time and the end-of-file mark information of corresponding audio stream and video flowing are in the new database: the absolute time of the Streaming Media storage server that storage algorithm is obtained and having finished.
2. the method for the accurate location playback position of a multi-medium data, said multi-medium data is by the described method storage of claim 1, and it is characterized in that: the concrete steps of playback are:
(1) the Streaming Media storage server obtains the play start time point of user at the multimedia file of the appointment of terminal input;
(2) the Streaming Media storage server is searched the multimedia file of this appointment from database, if can not find, the Streaming Media storage server sends error message to terminal, notifies the multimedia file of user's appointment not exist;
(3) if find the multimedia file of this appointment, the Streaming Media storage server calls location algorithm and opens index file B, calculate the position Pb among the play start time point indexed file B, the Pb place of indexed file B obtains the positional information Pa of key frame of video in data file A then, and the algorithm that calculates Pb is: Pb=(play start time-file time started)/(end of file time-file time started) * (the file header message length of index file length-index file B);
(4) the Streaming Media storage server calls the multi-medium data of Pa position among the storage algorithm read data files A, transmits multimedia data to client;
(5) behind the multi-medium data in sending step (4), storage algorithm reads the positional information Pa of next key frame of video in data file A among the index file B successively, and repeating step (4) finishes up to whole transmission of the data of multimedia file.
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2008
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