CN1964470A - A video on demand/live broadcast system and method - Google Patents
A video on demand/live broadcast system and method Download PDFInfo
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- CN1964470A CN1964470A CNA2005101194575A CN200510119457A CN1964470A CN 1964470 A CN1964470 A CN 1964470A CN A2005101194575 A CNA2005101194575 A CN A2005101194575A CN 200510119457 A CN200510119457 A CN 200510119457A CN 1964470 A CN1964470 A CN 1964470A
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Abstract
The related video ordering/live displaying method based on the improved H.323 system comprises: allocating an access number for every resource; calling the access number by UE; analyzing the number as H.323 protocol by gateway; then, looking up the number/URL mapping server by the gateway to convert number into URL by the mapping server. This invention is convenient to user.
Description
Technical field
The present invention relates to a kind of video request program/system and method, particularly relate to a kind ofly, realize video on demand/live broadcast system and method based on the multipoint video communication capacity of system H.323.
Background technology
Video living transmission system mainly is made up of service end and client two parts.Service end mainly realizes providing to each client user the function of Video service, and client is responsible for the decoding and the broadcast of video flowing.As shown in Figure 1, present video living transmission system is based on the IP packet switching network, carry out the transmission of Media Stream by the Internet, the user is a terminal with PC (personal computer) equipment, use corresponding streaming media playing software, initiate service request by IP address or URL address to direct broadcast server or vod server, the mode that combines with HTTP (HTML (Hypertext Markup Language)) and RTSP (real time streaming transport protocol) realizes the net cast business by internet access live streaming media server or vod server.
The shortcoming of this method is: lack unified user's scheduling and Service Management, the difficult quality of streaming media service is guaranteed; Terminal type is single, can only use the PC computer, the price height, and popularity rate is low; The user need use corresponding streaming media playing software, and complicated operation needs the user to possess certain computer usage level; And the user need know the broadcast address of program, is inconvenient to remember, and uses inconvenient.
At present based on H.323 the video conference and the video-phone system of technology are used more and more widely.H.323 protocol suite is a protocol suite of realizing point-to-point and multi-point communication on IP network.But at present, the utilization to this protocol suite only limits to realize point-to-point video communication (being video telephone) and multipoint videoconference.Point-to-point video communication and the multi-spot video conference system set up based on this agreement are known, can be described as H.323 system.
Therefore, need to improve on a kind of basis of the video communication ability in existing H.323 system, realize the system and method for video on demand/live broadcast.
Summary of the invention
The present invention proposes a kind of system and method for utilizing improved H.323 system to realize the video on demand/live broadcast service.By this system and method, the mode that the user can use radio phone terminal to adopt number to dial in is used the video on demand/live broadcast business.
According to the present invention, a kind of video living transmission system is provided, described system comprises: the net cast service system comprises the live source that is used for the net cast service; Based on system H.323, this system comprises: the video/audio coding/decoding apparatus, be used for to be converted to from the video/audio signal of the live source of described net cast service system the media file format that system H.323 supports, send it in the system H.323 multipoint control unit (MCU); Multipoint control unit, a multipoint conference service is organized in the request that is used to answer the user, and will be broadcast to user terminal from the video-voice frequency flow file of described video/audio coding/decoding apparatus; Number/URL mapping server is used to set up and access code that the maintenance customer dials in and want mapping relations between the URL address of interview show; And gatekeeper, be used to receive the access code that user terminal is dialled in, after it is carried out address resolution, inquire about described number/URL mapping server, with by described number/the URL mapping server is realized the conversion from the number to URL, and user terminal, as the video terminal, the input access code dialled in of user also receives URL after the conversion from described gatekeeper, obtains required net cast service with the request of sending to described multipoint control unit.
According to the present invention, a kind of net cast method is provided, described method comprises: for live source is distributed access code; User terminal is called out described access code; Described access code is resolved in the mode of protocol definition H.323 by the gatekeeper; After parsing, described gatekeeper consults number/URL mapping server, to realize the conversion from the access code to URL by described number/URL mapping server; MCU provides the net cast service in the mode of meeting, obtain Media Stream from live source and offer user terminal again, and user terminal is according to the URL that receives from the gatekeeper, by sending the required direct broadcast service of acquisition request to MCU.
According to the present invention, a kind of method that adopts number to realize guiding service is provided, described method comprises: for distributing an access code in each source; User terminal is called out described access code; Described access code is resolved in the mode of protocol definition H.323 by the gatekeeper; After parsing, described gatekeeper consults number/URL mapping server, to realize the conversion from the access code to URL by described number/URL mapping server.
According to the present invention, a kind of video on-demand system is provided, described system comprises: ordering server is used to by streaming media service; Number/URL mapping server is used to set up and access code that the maintenance customer dials in and want mapping relations between the URL address of interview show; And gatekeeper, be used to receive the access code that user terminal is dialled in, after it is carried out address resolution, inquire about described number/URL mapping server, to realize the conversion from the number to URL by described number/URL mapping server, and user terminal, as the video terminal, the access code that the input user dials in, and the URL that reception obtains is to initiate the acquisition request required service to described video on demand/live broadcast server, wherein said user terminal is supported HTTP, RTSP agreement, and support described live/stream media format that vod server adopted.
According to the present invention, a kind of VOD method is provided, described method comprises: for distributing access code in the program request source; User terminal is called out described access code; Described access code is resolved in the mode of protocol definition H.323 by the gatekeeper; After parsing, described gatekeeper consults number/URL mapping server, to realize the conversion from the access code to URL by described number/URL mapping server; The URL that obtains is turned back to described user terminal; And according to the URL that obtains, described user terminal is directly visited described program request source.
The present invention utilizes system H.323 to realize the method for video on demand/live broadcast, the present invention has made full use of the H.323 video communication and the conference dispatching ability of system, on it, developed this new value-added service capacity of net cast, enlarged the H.323 range of application of system, for the user who is unfamiliar with computation provides a kind of new mode of operation of using the net cast business, and improved the utilance of whole network and terminal equipment.
Thus, realized following advantage: by MCU, can carry out unified management and scheduling, provide the streaming media service that service quality guarantees to user's service request according to the system and method for support video on demand/live broadcast of the present invention; The user can use multiple terminals such as PC, video telephone to operate; And the user can use terminals such as video telephone, and the operating habit according to black phone dials phone number obtains the net cast service by the channel number of dialing appointment, has reduced user's memory burden, and is convenient to use.
Following detailed description by the reference accompanying drawing will be seen that above and other objects of the present invention, feature, each side and advantage.
Description of drawings
The accompanying drawing that is included in this explanation and constitutes this explanation part is used from the explanation embodiments of the invention with the general description one that provides above, provides the detailed description of each embodiment below, is used to explain principle of the present invention, wherein:
Fig. 1 is based on the video on demand/live broadcast system figure of PC;
Fig. 2 describes according to of the present invention to utilize number/URL mapping method to realize the schematic diagram of the system of net cast business based on system H.323;
Fig. 3 is the schematic diagram according to number guidance mode of the present invention;
Fig. 4 be according to utilization of the present invention H.323 system carry out the professional networking schematic diagram of net cast;
Fig. 5 is a schematic diagram of realizing the system of net cast/demand (telecommunication) service according to number of the present invention/URL mapping method;
Fig. 6 is the net cast flow chart of realizing according to the video living transmission system of the present invention that Fig. 1 describes based on video telephone;
Fig. 7 is according to MCU system module figure of the present invention.
Embodiment
Below with reference to the accompanying drawings, specifically describe specific embodiments of the invention.
At first describe according to of the present invention based on the video living transmission system of system H.323.Fig. 2 be describe according to of the present invention based on system H.323, utilize number/URL mapping method to realize the figure of the video living transmission system of net cast business.Shown in Figure 2, described video living transmission system mainly comprises: based on system 20, net cast service system 10 and user terminal 31 H.323.
Comprise multipoint control unit (MCU) 25, gatekeeper 24 (GK), video/audio coding/decoding apparatus 22, management platform 21 and number/URL mapping server 23 etc. based on H.323 system 20.
Net cast service system 10 comprises the live source that realizes the net cast service, as net cast server 13 and live telecast source 12, and the management server 11 of realizing service management.This net cast service system 10 can also comprise vod server (VOD) 14, is used for order program service (accompanying drawing 5 below has specific descriptions).
In based on system 20 H.323, video/audio coding/decoding apparatus 22 is responsible for being converted to from the video/audio signal of the live telecast source 12 in the video direct broadcast service system 10 (TV signal source) or direct broadcast server 13 the H.323 media file format (as H.263 waiting) of system's support, it is sent to based on the MCU 25 in the system 20 H.323, be broadcast to the user terminal of this content of request by MCU 25.Between live telecast source 12 and video/audio coding/decoding apparatus 22, also can have TV signal boxcar 15 (not shown in figure 1)s, after being used for to carry out from the signal in live telecast source 12 the TV/AV conversion, send the signal after the conversion to corresponding video/audio coding/decoding apparatus 22.Number/URL mapping server 23 is database servers, the mapping relations between access code that responsible foundation and maintenance customer dial and the URL address of wanting interview show.The access code that number/URL mapping server 23 is sent according to gatekeeper 24 can return the URL address of respective program.Gatekeeper 24 is asset management devices of net cast network, and it provides functions such as address resolution, call manager, endpoint registration.Specifically, gatekeeper 24 receives the specific access code (for example being special service number) that user terminal is dialled in, after carrying out address resolution, enquiry number/URL mapping server 23, to realize the conversion from the number to URL by number/URL mapping server 23, thus the Client-initiated number request is converted to the URL address, and informs that user terminal provides the MCU address of service for it.The concrete number guidance mode method that realizes the mapping between access code that the user dials and the URL address of the wanting interview show will 3 be described in detail below with reference to the accompanying drawings.Multipoint control unit (MCU) the 25th, end points in the network, it is three or more terminals and multipoint conference service of gateway tissue.MCU 25 is nucleus equipments of native system, and the video-voice frequency flow file that it sends video/audio coding/decoding apparatus 22 here is broadcast to other-end.
Also comprise management platform 21 based on H.323 system 20, it is responsible for the management based on H.323 system's 20 inner each equipment, and finishes user's functions such as authentication, charging, and described management platform 21 can be realized by known server.
In net cast service system 10, management such as the generation of the management server 11 responsible live content of managing video business, issue, content search.Net cast server 12 is streaming media servers of standard, and live streaming media service can be provided.Live telecast source 13 is cable TV signal sources.
As stated in the Background Art, the user can adopt traditional net cast method of service when obtaining the net cast service, and promptly input will watch the URL address of program to obtain service on the video terminal.But, because the video terminal input character also is not very convenient, and consider that most of users make telephonic custom, native system provides a kind of especially and adopts number but not URL realizes the method (as shown in Figure 3) of the uniqueness of guiding service, allows the user just can obtain the net cast service by the special service number of dialing appointment.At this moment, what user terminal was called out is a specific number, and number is resolved by the gatekeeper in the mode of protocol definition H.323.At this moment, the gatekeeper passes through the conversion of mapping library realization from the number to URL of inquiry, and the result is returned to terminal.Terminal determines that according to the URL address information next step is visit MCU system or vod server, realizes live and demand (telecommunication) service.
Fig. 3 is the schematic diagram according to number guidance mode of the present invention.At the step S1 of Fig. 3, user terminal is called out a specific number, is undertaken alternately number information being passed to the gatekeeper by agreement H.323 between user terminal and the gatekeeper (gatekeeper 24 as shown in Figure 1).At step S2, the gatekeeper resolves the number information that receives, obtain the number that user terminal is dialed, then, the gatekeeper initiates query requests by http protocol to number/URL mapping server (number/URL mapping server 23 as shown in Figure 1), mapping server is inquired about in number/URL mapping database according to this number, obtains corresponding URL address.At step S3, number/URL mapping server returns to the gatekeeper with this URL address.At step S4, the gatekeeper returns the URL address information to user terminal.At step S5, user terminal is initiated request according to the Return URL address information to MCU or vod server.
In the present invention, the number that the user dials is a logical address, is real physical address by the URL address after the address transition, and two parts information is mainly divided in the URL address: the positional information of the network address+program.User terminal is initiated request according to the positional information of the network address in the Return URL address information or program to MCU or vod server.
Fig. 4 be according to utilization of the present invention H.323 system carry out the professional networking schematic diagram of net cast.By the number bootup process of Fig. 3, if user's request is directed into based on the MCU 25 in the system 20 H.323, MCU 25 provides the net cast service in the mode of meeting, as shown in Figure 4.MCU 25 is according to user's request, to user's allocation of channel resources may, and sends instruction to direct broadcast server 12 or live telecast source 13, obtains Media Stream and offers user terminal 31 again.The concrete implementation that realizes foregoing description can be by the mode and the direct broadcast server mode of following TV conversion.
The mode of corresponding TV conversion, at first will carry out the TV/AV conversion by TV signal boxcar 15 as the signal in the live telecast source 13 of TV signal source, output audio-video signal (A/V signal), then this signal is input to corresponding video signal encoding and decoding and conversion equipment 22, these video signal encoding and decoding and conversion equipment 22 can be added a video conference as video terminal, and the video-voice frequency flow of this equipment is broadcasted in the configuration meeting.User terminal can be watched live by adding this meeting.
Corresponding direct broadcast server mode, live source is provided by direct broadcast server 13, the signal that direct broadcast server 13 is provided by RTSP Streaming Media host-host protocol is sent to the video/audio coding/decoding apparatus 22 corresponding with it, this video/audio coding/decoding apparatus 22 is at first as the video/audio signal of a media player acceptance from direct broadcast server 13, then the video/audio signal of being accepted is converted to the H.323 media formats (for example H.263 waiting) of system's support, the Media Stream after will changing again sends to MCU 25 as input.In like manner, the look audio medium stream of MCU 25 broadcasting after 22 conversions of video/audio coding/decoding apparatus realized live.
Therefore, for the user, no matter which kind of implementation all is to adopt the mode of dialing to obtain service.In the mode by MCU realization net cast according to the present invention, system can distribute the number of a special use for each direct broadcast band, the user dials this number by for example visual user terminal, can enter corresponding meeting, watches the content of being broadcasted by MCU.
According to another embodiment, utilize above-mentioned number bootstrap technique of the present invention, can realize VOD service.
Fig. 5 is the schematic diagram that utilizes the video on-demand system of number of the present invention/URL mapping method.
Video on-demand system shown in Fig. 5 comprises: vod server (VOD) 14, user terminal 31, gatekeeper 24 and number/URL mapping library 23.
Vod server 14 is used to answer the visit of user's terminal 31, by RTSP Streaming Media is sent to user terminal 31.Number/URL mapping server 23 is database servers, the mapping relations between access code that responsible foundation and maintenance customer dial and the URL address of wanting interview show.The access code that number/URL mapping server 23 is sent according to gatekeeper 24 can return the URL address of respective program.Gatekeeper 24 is asset management devices of net cast network, and it provides address resolution function.Specifically, gatekeeper 24 receives the specific access code (for example being special service number) that user terminal 31 is dialled in, after carrying out address resolution, enquiry number/URL mapping server 23, to realize the conversion from the number to URL by number/URL mapping server 23, thus the Client-initiated number request is converted to the URL address, and informs user terminal.User terminal 31 is supported agreements such as HTTP, RTSP, and supports live/stream media format that vod server adopted, as Media, Real etc.Through the number bootup process of Fig. 3, according to the URL address of returning, user terminal 31 is directly initiated request to vod server 14, obtains service.
The step S1-S5 that describes among Fig. 5 is corresponding with the corresponding steps among Fig. 3, does not repeat them here.After step S4 returned user terminal 31 URL addresses, user terminal 31 was initiated request to vod server 14, requires video-on-demand service.At step S6, vod server 14 provides streaming media service according to the request of user terminal 31 to sending this requesting users terminal 31 logical RTSP.
Be that above-mentioned VOD method comprises the steps: to distribute access code into the program request source; User terminal is called out described access code; Described access code is resolved in the mode of protocol definition H.323 by the gatekeeper; After parsing, described gatekeeper consults number/URL mapping server, to realize the conversion from the access code to URL by described number/URL mapping server; The URL that obtains is turned back to described user terminal; And according to the URL that obtains, described user terminal is directly visited described program request source.
Net cast use flow process according to the video living transmission system of the present invention of Fig. 1 is described below.
Fig. 6 is the net cast flow chart of realizing according to the video living transmission system of the present invention that Fig. 1 describes based on video telephone.
Exemplary business configuration flow process according to video living transmission system of the present invention is as follows:
Being each AV or meeting of Cable port assignment number, is that each meeting number distributes a port in other words; Gatekeeper 25 finishes the channel Number for access to the conversion between the meeting number; User terminal is registered on the gatekeeper, the corresponding programme channel Number for access of customer call can watch corresponding TV programme,
Professional exemplary use flow process according to video living transmission system of the present invention is as follows:
(1) service provider will be integrated the content that obtains there from content supplier and organize according to channel, and be published among Portal (door) interface of live broadcast service;
(2) user inserts live Portal by a key Portal function request of terminal;
(3) Portal returns to terminal with the guiding service interface and shows;
(4) user by keyboard up and down, numerical key and the acknowledgement key mode and the professional Portal interface alternation that make up, select the video content of live channel;
(5) service distribution and management platform inquiry backstage Service Database carries out authentication, while inquiring user account balance to the user, and it is this time professional to judge whether the user can use;
(6) this time professional if the user can use, service distribution and management platform send tariff information to the user, and the prompting user reaffirms;
(7) service distribution and management platform receive user's affirmation request, and the notice direct broadcast server will ask the user of certain channel to join this channel multicast group;
(8) direct broadcast server produces charge information and user and uses information when the user provides service, sends to service distribution and management server.
Realization according to video living transmission system of the present invention, except the mode that can adopt Fig. 2 realizes, also can carry out as shown in Figure 7 transformation to the MCU system, be basic module in the solid box wherein, must be integrated in a device interior realizes, other modules in the frame of broken lines can be integrated in the equipment, also can be used as the autonomous device form.As the TV signal modular converter, can be used as independent equipment, also can be integrated among the MCU; Can be cured among the MCU, also can be used as pluggable module.
More than invention has been described.Though detailed description of the present invention is at example embodiment, to those skilled in the art, various modification and the replacement form of these embodiment all can be imagined.Therefore, all modification and replacement forms in the clear and definite scope of patent protection of the present invention of claims have been contained in the present invention.
Claims (15)
1. video living transmission system, described system comprises:
The net cast service system comprises the live source that is used for the net cast service;
Based on system H.323, this system comprises:
The video/audio coding/decoding apparatus is used for the video/audio signal from the live source of described net cast service system is converted to the media file format that system H.323 supports, sends it in the system H.323 multipoint control unit (MCU);
Multipoint control unit, a multipoint conference service is organized in the request that is used to answer the user, and will be broadcast to user terminal from the video-voice frequency flow file of described video/audio coding/decoding apparatus;
Number/URL mapping server is used to set up and access code that the maintenance customer dials in and want mapping relations between the URL address of interview show; And
The gatekeeper is used to receive the access code that user terminal is dialled in, it is carried out address resolution after, inquire about described number/URL mapping server, with realize by described number/URL mapping server from the number to URL conversion and
User terminal, as the video terminal, the access code dialled in of input user, and receive URL after the conversion from described gatekeeper, obtain required net cast service with the request of sending to described multipoint control unit.
2. according to the system of claim 1, the live source in the wherein said net cast service system comprises net cast server and live telecast source.
3. according to the system of claim 1, the live source in the wherein said net cast service system comprises the live telecast source.
4. according to the system of claim 1, the live source in the wherein said net cast service system comprises the net cast server.
5. according to the system of claim 2 or 3, wherein said system based on H.323 also has at the TV signal boxcar, be used for to carry out from the signal in live telecast source the TV/AV conversion, and the signal after will changing sends corresponding video/audio coding/decoding apparatus to.
6. according to the system of claim 1, wherein said system based on H.323 also comprises management platform, and it is responsible for the management based on H.323 each equipment of internal system, and carries out user's authentication, charging.
7. net cast method, described method comprises:
For live source is distributed access code;
User terminal is called out described access code;
Described access code is resolved in the mode of protocol definition H.323 by the gatekeeper;
After parsing, described gatekeeper consults number/URL mapping server, to realize the conversion from the access code to URL by described number/URL mapping server;
Multipoint control unit provides the net cast service in the mode of meeting, obtains Media Stream from live source and offers user terminal again; And
User terminal is according to the URL that receives from the gatekeeper, by sending the required direct broadcast service of acquisition request to multipoint control unit.
8. method according to claim 7, wherein said live source is a direct broadcast server, and obtaining Media Stream from live source comprises: the video/audio signal that described direct broadcast server is provided by RTSP Streaming Media host-host protocol is sent to the video/audio coding/decoding apparatus corresponding with it, this video/audio coding/decoding apparatus is converted to the H.323 media formats of system's support with the video/audio signal of being accepted, and the Media Stream after will changing again sends to multipoint control unit as input.
9. method according to claim 7, wherein said live source is the live telecast source, obtaining Media Stream from live source comprises: the signal in live telecast source is carried out the TV/AV conversion by the TV signal boxcar, the output audio-video signal, then this signal is input to corresponding video signal encoding and decoding and conversion equipment, wherein these video signal encoding and decoding and conversion equipment add the video conference of being initiated by multipoint control unit as video terminal.
10. method that adopts number to realize guiding service, described method comprises:
For distributing an access code in each source;
User terminal is called out described access code;
Described access code is resolved in the mode of protocol definition H.323 by the gatekeeper;
After parsing, described gatekeeper consults number/URL mapping server, to realize the conversion from the access code to URL by described number/URL mapping server.
11. method according to claim 10, wherein said source are live source, described method also comprises: the gatekeeper returns the URL that obtains to user terminal;
Multipoint control unit provides the net cast service in the mode of meeting; And
User terminal adopts the URL that obtains to visit described direct broadcast server and obtains required direct broadcast service.
12. method according to claim 11, wherein said live source are direct broadcast server or live telecast source.
13. method according to claim 10, wherein said source are vod server, described method also comprises: the gatekeeper returns the URL that obtains to user terminal; And
User terminal adopts the URL that obtains to visit described vod server and obtains required order program service.
14. a video on-demand system, described system comprises:
Ordering server is used to by streaming media service;
Number/URL mapping server is used to set up and access code that the maintenance customer dials in and want mapping relations between the URL address of interview show; And
The gatekeeper is used to receive the access code that user terminal is dialled in, it is carried out address resolution after, inquire about described number/URL mapping server, with realize by described number/URL mapping server from the number to URL conversion and
User terminal, as the video terminal, the access code that the input user dials in, and the URL that reception obtains is to initiate the acquisition request required service to described video on demand/live broadcast server, wherein said user terminal is supported HTTP, RTSP agreement, and support described live/stream media format that vod server adopted.
15. a VOD method, described method comprises:
For distributing access code in the program request source;
User terminal is called out described access code;
Described access code is resolved in the mode of protocol definition H.323 by the gatekeeper;
After parsing, described gatekeeper consults number/URL mapping server, to realize the conversion from the access code to URL by described number/URL mapping server;
The URL that obtains is turned back to described user terminal; And
According to the URL that obtains, described user terminal is directly visited described program request source.
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| CNA2005101194575A CN1964470A (en) | 2005-11-10 | 2005-11-10 | A video on demand/live broadcast system and method |
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| CN100464582C (en) * | 2006-04-11 | 2009-02-25 | 华为技术有限公司 | Method and system for receiving and watching programs in living broadcast through TV system of conference |
| WO2009033392A1 (en) * | 2007-09-13 | 2009-03-19 | Huawei Technologies Co., Ltd. | Multimedia-on-demand method and system, multimedia terminal, multimedia system and service proxy |
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| CN102045452A (en) * | 2009-10-16 | 2011-05-04 | 陈俊生 | Service method of open transmission service platform using audio-visual telephone |
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| CN101365096B (en) * | 2007-08-09 | 2012-05-23 | 华为技术有限公司 | Method for providing video content, related service apparatus and system |
| CN103747285A (en) * | 2013-12-27 | 2014-04-23 | 乐视网信息技术（北京）股份有限公司 | Program playing method, server side and client |
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| CN101374226B (en) * | 2007-08-23 | 2011-05-11 | 中兴通讯股份有限公司 | Method for ordering program of interactive network television system |
| WO2009033392A1 (en) * | 2007-09-13 | 2009-03-19 | Huawei Technologies Co., Ltd. | Multimedia-on-demand method and system, multimedia terminal, multimedia system and service proxy |
| CN101123718B (en) * | 2007-09-13 | 2011-12-21 | 华为技术有限公司 | Multi-media ordering method and system |
| CN101252590B (en) * | 2008-03-31 | 2012-04-25 | 蓝汛网络科技（北京）有限公司 | Apparatus, system and method for distributing stream medium content |
| CN101605243B (en) * | 2008-06-12 | 2011-08-10 | 华为技术有限公司 | Method, media apparatus and user side apparatus for providing programs |
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