CN104918108A - Video accurate positioning device and method based on HLS (HTTP Live Streaming) protocol - Google Patents
Video accurate positioning device and method based on HLS (HTTP Live Streaming) protocol Download PDFInfo
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- CN104918108A CN104918108A CN201510311609.5A CN201510311609A CN104918108A CN 104918108 A CN104918108 A CN 104918108A CN 201510311609 A CN201510311609 A CN 201510311609A CN 104918108 A CN104918108 A CN 104918108A
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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
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
- H04N21/4402—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display
- H04N21/440281—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display by altering the temporal resolution, e.g. by frame skipping
-
- 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]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
- H04N21/845—Structuring of content, e.g. decomposing content into time segments
- H04N21/8456—Structuring of content, e.g. decomposing content into time segments by decomposing the content in the time domain, e.g. in time segments
Abstract
The invention discloses a video accurate positioning device and method based on an HLS (HTTP Live Streaming) protocol, and relates to the field of stream media playing. The video accurate positioning device is arranged on a set top box, and comprises a control module, and a playing module, a circular buffering module, an I-frame retrieval module and an HLS module which are connected with the control module, wherein the circular buffering module is connected with the I-frame retrieval module and the HLS module; the HLS module is used for interacting with an HLS server; the circular buffering module is used for circularly downloading and managing TS (Transport Stream) fragments; the I-frame retrieval module is used for finding the TS fragments downloaded in the circular buffering module and establishing an I-frame retrieval list; the playing module is used for extracting the TS fragments from the circular buffering module for playing; and the control module is used for controlling all the modules. Through adoption of the video accurate positioning device and method, accurate positioning can be realized during video playing; screen blurring is avoided; a good playing effect is achieved; and the user experience is improved.
Description
Technical field
The present invention relates to streaming media playing field, specifically refer to a kind of video accurate positioning device based on HLS protocol and method.
Background technology
Along with the development of digital technology and Internet technology, the application of internet multimedia is day by day prosperous, and the specification of HLS (the dynamic code rate adaptive technique of HTTP Live Streaming, Apple) is applied more and more extensive in internet multimedia.HLS protocol feature is that continuous media data huge for capacity are carried out segmentation, and TS (Transport Stream) burst being divided into One's name is legion transmits, and Set Top Box is constantly asked to download TS burst and realized smooth broadcasting.In HLS protocol specification, each TS burst has the duration of #EXTINF field identification burst, and each burst has a sequence number to correspond, and therefore, HLS also supports the positioning action of program request while supporting live and program request.Because each TS burst has the information of sequence number and duration, so Set Top Box can remove to calculate according to the time of location the TS burst needing to play, select to need the TS burst play to play according to result of calculation, so just reach the effect of location.
Unit positioning time in current most of HLS application is second, be less than the duration of a TS burst, when the time of location is when a TS burst is middle, Set Top Box just needs to download this burst and plays, and the I frame be not accurate near positioning time is play; If but do not play from I frame, play and have flower screen, result of broadcast is bad, to user feel to locate not inaccurate, Consumer's Experience weak effect.
Summary of the invention
For the defect existed in prior art, the object of the present invention is to provide a kind of video accurate positioning device based on HLS protocol and method, in broadcasting, realize precise positioning, avoid flower screen, result of broadcast is good, improves Consumer's Experience.
For reaching above object, the present invention takes a kind of video accurate positioning device based on HLS protocol, be arranged at Set Top Box, comprise control module, and the playing module be connected with control module respectively, circular buffer module, I frame retrieval module and HLS module, circular buffer module also connects I frame retrieval module and HLS module respectively; Wherein, HLS module is used for and HLS server interaction, circular buffer module is used for downloading TS slicing cycle and managing, I frame retrieval module is used for searching the TS burst downloaded in circular buffer module and setting up I frame indices list, playing module is used for from circular buffer module, get TS burst and plays, and control module is for controlling above-mentioned all modules.
On the basis of technique scheme, be provided with playlist in HLS module, the list item of playlist comprises the slicing sequence number of TS point of leaf length and correspondence.
The present invention also provides a kind of video accurate positioning method based on HLS protocol, Set Top Box receives HLS program request play command, HLS module is downloaded corresponding M3U8 file and is resolved, generate TS burst index, circular buffer module downloads TS burst, playing module plays the TS burst that circular buffer module has been downloaded, and I frame retrieval module is retrieved the TS burst that in circular buffer, each is downloaded, and sets up I frame indices list; After Set Top Box receives positioning playing order, control module calculates the TS burst information needing to play according to positioning time, the TS burst information needing to play is found from circular buffer module, again according to calculating in circular buffer module positioning time and I frame indices list the I frame address information storing this of video content positioning time, playing module, according to I frame address information in circular buffer module, extracts corresponding audio, video data and plays.
On the basis of technique scheme, HLS module downloads corresponding M3U8 file and the concrete steps of resolving are: S201.HLS module according to the broadcasting URL received, to server request one-level M3U8 file; S202. the one-level M3U8 file got resolved and generate secondary M3U8 file request URL; S203.HLS module is to server request secondary M3U8 file; S204.HLS module is resolved the secondary M3U8 file got and is generated TS burst index.
On the basis of technique scheme, circular buffer module downloads the TS burst needing to play successively according to TS burst index.
On the basis of technique scheme, circular buffer module is downloaded in TS Slicing procedure, the vacant size of real-time judge circular buffer inside modules, if inner vacant not enough time, stop downloading TS burst, only in inside vacant enough time, continue to download new TS burst.
On the basis of technique scheme, the flow process that I frame retrieval module sets up I frame indices list is: S301. carries out Program Association Table parsing to the TS burst downloaded in circular buffer module; S302. according to the Program Association Table be resolved to, Program Map Table is resolved; S303. according to the Program Map Table be resolved to, video identity code transmission package is resolved; S304. according to the video identity code transmission package be resolved to, in TS burst, the PES packet header of video identity code transmission package is found; S305. according to the PES packet header found, determine whether the PES header data of I frame, if so, enter S306; If not, S304 is entered; S306. set up I frame indices list according to the I frame PES header data found, enter S301.
On the basis of technique scheme, Set Top Box finds the TS burst information needing to play from circular buffer module, if now do not need the TS burst information play in circular buffer module, then circulating picture-changing cache module is by downloading this TS burst in network, after download completes, carry out the retrieval of I frame again, set up I frame indices list.
Beneficial effect of the present invention is: the I frame information for TS burst carries out retrieving and sets up I frame indices list, when positioning action, the I frame needing to play is calculated according to the temporal information of location, Set Top Box is play from the I frame calculated, solve the problem that can not navigate in the middle of TS burst, can not revise on the basis of HLS protocol, the video that just can realize HLS protocol in Set Top Box side be accurately located, result of broadcast is good, improves Consumer's Experience.
Accompanying drawing explanation
Fig. 1 is the video accurate positioning device schematic diagram of the embodiment of the present invention based on HLS protocol;
Fig. 2 is the flow chart of the embodiment of the present invention based on the video accurate positioning method of HLS protocol;
Fig. 3 is that embodiment of the present invention HLS module downloads corresponding M3U8 file and the flow chart of resolving;
Fig. 4 is the flow chart that the embodiment of the present invention sets up I frame indices list.
Reference numeral:
1-control module, 2-playing module, 3-circular buffer module, 4-I frame retrieval module, 5-HLS module.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
As shown in Figure 1, the present invention is based on the video accurate positioning device of HLS protocol, be arranged at Set Top Box, comprise control module 1, and the playing module 2 be connected with control module 1 respectively, circular buffer module 3, I frame retrieval module 4 and HLS module 5, circular buffer module 3 also connects in playing module 2, I frame retrieval module 4 and HLS module 5, HLS module respectively and is provided with playlist, and the list item of playlist comprises the slicing sequence number of TS point of leaf length and correspondence.Wherein, HLS module 5 for HLS server interaction, complete the realization of HLS protocol; Circular buffer module 3 is for downloading TS slicing cycle and managing; I frame retrieval module 4 is for searching the TS burst downloaded in circular buffer module 3 and set up I frame indices list; Playing module 2 is play for getting TS burst from circular buffer module 3; Control module 1, for controlling playing module 2, circular buffer module 3, I frame retrieval module 4 and HLS module 5 collaborative work, completes HLS broadcasting and the accurate location based on HLS.
As shown in Figure 2, the embodiment of the present invention is as follows based on the detailed step of the video accurate positioning method of HLS protocol:
S1. Set Top Box receives HLS program request play command.
S2. control module 1 is according to the HLS program request play command received and broadcasting URL (Uniform Resource Locator, URL(uniform resource locator)), and control HLS module 5 is downloaded corresponding M3U8 file and resolved, and generates TS burst index.
S3. circular buffer module 3 selects suitable code check according to network condition, downloads the TS burst needing to play according to TS burst index successively.Meanwhile, playing module 2 plays the TS burst downloaded in circular buffer module 3, and the TS burst that in I frame retrieval module 4 pairs of circular buffer modules 3, each is downloaded is retrieved, and sets up I frame indices list.Download in TS Slicing procedure in circular buffer module 3, the vacant size of circular buffer module 3 real-time judge circular buffer inside modules, if inner vacant not enough time, stop downloading TS burst, only in inside vacant enough time, continue to download new TS burst.
S4. after control module 1 receives positioning playing order, according to the time of positioning playing order, calculate the TS burst information needing to play, i.e. TS slicing sequence number, basis is point leaf length of #EXTINF field identification and the slicing sequence number of correspondence in HLS playlist.
S5. judge whether to have downloaded in circular buffer module 3 the TS burst information needing to play, if so, enter S7; If not, S6 is entered.
S6. by HLS module 5 by downloading the TS burst information calculated in S4 in HLS server to circular buffer module 3.I frame retrieval module 4 is retrieved the TS burst downloaded, and sets up I frame indices list.
S7. according to calculating the I frame needing to play positioning time, then the I frame play as required to search in I frame indices list corresponding memory address, draws in circular buffer module 3 the I frame address information storing this of video content positioning time.
S8. control module 1 notifies playing module 2, according to the I frame address information drawn, extracts corresponding audio, video data and plays, reach pinpoint effect from circular buffer module 3.
As shown in Figure 3, in step S2, HLS module 5 is downloaded corresponding M3U8 file and is resolved, and the idiographic flow generating TS burst index is:
S201.HLS module 5 according to the broadcasting URL received, to HLS server request one-level M3U8 file;
S202. the one-level M3U8 file got resolved and generate secondary M3U8 file request URL;
S203.HLS module 5 is to server request secondary M3U8 file;
S204.HLS module 5 is resolved the secondary M3U8 file got and is generated TS burst index.
As shown in Figure 4, in step S3, the flow process that I frame retrieval module 4 sets up I frame indices list is:
S301. PAT (Program Association Table, Program Association Table is resolved) is carried out to the TS burst downloaded in circular buffer module 3;
S302. according to the PAT be resolved to, PMT (Program Map Table, Program Map Table) is resolved;
S303. according to the PMT be resolved to, video PID (Packet Identifier, identity code transmission package) is resolved;
S304. according to the video PID be resolved to, in TS burst, PES (Packetized Elementary Stream, the packetized elementary stream) packet header of video PID is found;
S305. according to the PES packet header found, determine whether the PES header data of I frame, if so, enter S306; If not, S304 is entered;
S306. set up I frame indices list according to the I frame PES header data found, enter S301, until the TS fragment data in circular buffer module 3 is all searched one time.Wherein, I frame PES header data comprises PES data and address information, and address information refers to the address of depositing this PES header data in circular buffer module 3, sets up I frame indices list according to PES data and address information.
Apparatus and method of the present invention, are not limited in Set Top Box and use, and the equipment of any use identical (SuSE) Linux OS platform can use after suitable amendment is transplanted.
The present invention is not limited to above-mentioned execution mode, and for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications are also considered as within protection scope of the present invention.The content be not described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (8)
1. the video accurate positioning device based on HLS protocol, be arranged at Set Top Box, it is characterized in that, comprise control module, and the playing module be connected with control module respectively, circular buffer module, I frame retrieval module and HLS module, circular buffer module also connects I frame retrieval module and HLS module respectively; Wherein, HLS module is used for and HLS server interaction, circular buffer module is used for downloading TS slicing cycle and managing, I frame retrieval module is used for searching the TS burst downloaded in circular buffer module and setting up I frame indices list, playing module is used for from circular buffer module, get TS burst and plays, and control module is for controlling above-mentioned all modules.
2., as claimed in claim 1 based on the video accurate positioning device of HLS protocol, it is characterized in that: be provided with playlist in HLS module, the list item of playlist comprises the slicing sequence number of TS point of leaf length and correspondence.
3. the video accurate positioning method based on HLS protocol based on device described in claim 1, it is characterized in that: Set Top Box receives HLS program request play command, HLS module is downloaded corresponding M3U8 file and is resolved, generate TS burst index, circular buffer module downloads TS burst, playing module plays the TS burst that circular buffer module has been downloaded, and I frame retrieval module is retrieved the TS burst that in circular buffer, each is downloaded, and sets up I frame indices list; After Set Top Box receives positioning playing order, control module calculates the TS burst information needing to play according to positioning time, the TS burst information needing to play is found from circular buffer module, again according to calculating in circular buffer module positioning time and I frame indices list the I frame address information storing this of video content positioning time, playing module, according to I frame address information in circular buffer module, extracts corresponding audio, video data and plays.
4. as claimed in claim 3 based on the video accurate positioning method of HLS protocol, it is characterized in that: HLS module downloads corresponding M3U8 file and the concrete steps of resolving are
S201.HLS module according to the broadcasting URL received, to server request one-level M3U8 file;
S202. the one-level M3U8 file got resolved and generate secondary M3U8 file request URL;
S203.HLS module is to server request secondary M3U8 file;
S204.HLS module is resolved the secondary M3U8 file got and is generated TS burst index.
5. as claimed in claim 4 based on the video accurate positioning method of HLS protocol, it is characterized in that: circular buffer module downloads the TS burst of needs broadcasting successively according to TS burst index.
6. the video accurate positioning method based on HLS protocol as described in claim 3 or 5, it is characterized in that: circular buffer module is downloaded in TS Slicing procedure, the vacant size of real-time judge circular buffer inside modules, if during inner vacant deficiency, stop downloading TS burst, only in inside vacant enough time, continue to download new TS burst.
7., as claimed in claim 3 based on the video accurate positioning method of HLS protocol, it is characterized in that: the flow process that I frame retrieval module sets up I frame indices list is
S301. Program Association Table parsing is carried out to the TS burst downloaded in circular buffer module;
S302. according to the Program Association Table be resolved to, Program Map Table is resolved;
S303. according to the Program Map Table be resolved to, video identity code transmission package is resolved;
S304. according to the video identity code transmission package be resolved to, in TS burst, the PES packet header of video identity code transmission package is found;
S305. according to the PES packet header found, determine whether the PES header data of I frame, if so, enter S306; If not, S304 is entered;
S306. set up I frame indices list according to the I frame PES header data found, enter S301.
8. as claimed in claim 3 based on the video accurate positioning method of HLS protocol, it is characterized in that: Set Top Box finds the TS burst information that needs are play from circular buffer module, if now do not need the TS burst information play in circular buffer module, then circulating picture-changing cache module is by downloading this TS burst in network, after download completes, carry out the retrieval of I frame again, set up I frame indices list.
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| CN105915493A (en) * | 2015-12-03 | 2016-08-31 | 乐视致新电子科技（天津）有限公司 | Audio and video real-time transmission method and device and audio and video real-time playing method and device |
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| CN109729387A (en) * | 2019-01-07 | 2019-05-07 | 烽火通信科技股份有限公司 | Playback method and system based on the network direct broadcasting of HLS protocol after fault recovery |
| CN109951446A (en) * | 2019-01-30 | 2019-06-28 | 亦非云互联网技术（上海）有限公司 | Current stabilization method, system, computer storage medium and the electronic equipment of live stream |
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| CN115550746A (en) * | 2022-10-11 | 2022-12-30 | 杭州视洞科技有限公司 | HLS low-delay method based on network camera and media distribution service system |
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Application publication date: 20150916 |