CN1921462A - Gateway based on real-time flow host-host protocol - Google Patents
Gateway based on real-time flow host-host protocol Download PDFInfo
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- CN1921462A CN1921462A CN 200610060489 CN200610060489A CN1921462A CN 1921462 A CN1921462 A CN 1921462A CN 200610060489 CN200610060489 CN 200610060489 CN 200610060489 A CN200610060489 A CN 200610060489A CN 1921462 A CN1921462 A CN 1921462A
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Abstract
The invention relates to a gateway based on real-time flow transmission protocol. Wherein, it comprises a group of projection relationship list; said list comprises streams, channels and stream channel; the streams list records the information of external input TS flow; the channels list records the information of IPQAM signal channel; the stream channel list records the relationship between streams list and channels list. The inventive gateway, in the replay process of program order of ITV, can avoid direct communication between STB and RTSP video server, and transfer with said gateway; therefore, it can avoid matching and modification on different STB and RTSP server.
Description
Technical field
The present invention relates to the internet, applications field, especially be applied in the digital television system about a kind of, the Control Network video server is to the gateway (RTSP Agent) of internet transmission video stream data.
Background technology
Real time streaming transport protocol (RealTime Streaming Protocol, RTSP) be a kind of standard that the ITU of international communication federation defines in RFC2326, this standard is based upon on the tcp protocol layer usually, be used to realize the real-time foundation and the control operation of Multimedia session, for example the session both sides are to the negotiation of transmitting-receiving Media Stream type, transmission means of named data stream or the like.The RTSP agreement of standard is ordered the initialization of finishing transport layer by SETUP, promptly realizes the negotiation (as the port numbers between client and the server, host-host protocol etc.) of transmission information.As a kind of multimedia control protocol that is used on internet C/S framework, RTSP has obtained utilization preferably.In recent years, along with the appearance of interactive digital television technology, utilize the RTSP agreement to carry out the also fast development of mutual network video server technology.Existing interactive digital television is by network video server and quadrature amplitude modulator (the IP QuadratureAmplitude Modulation that is with the IP interface based on the RTSP agreement, IPQAM) form front end system, two film set-top box (Set-Top Box, STB) as terminal, can realize the business such as video request program, direct playing and playback on the digital TV network, thus the application of expansion of digital television.
A kind of IPQAM of prior art as shown in Figure 1.The groundwork unit of IPQAM is channel (Channel), and (User Data Protocol, UDP) (Transport Stream TS) encapsulates the IPQAM channel with transmit flow data according to User Datagram Protoco (UDP).TS generally comprises following 5 parameters: (Program ID, PID), target ip address and target port, IPQAM sends it on the IPQAM channel of assigned frequency after TS stream is shone upon for source IP address, source port, program address
But there is following deficiency in prior art:
At first, the interactive digital television system is all different with physical channel and data transfer mode that common the Internet is adopted in the transmission data, on the data sendaisle, source of media can only send to IPQAM by the Internet, the mode of IPQAM employing channeling modulates data on the different frequency ranges to be transmitted, can not resemble between IPQAM and the STB and identify by the IP address the Internet, can only decide by continuous frequency parameter, so just cause the inconvenience of communicating by letter between IPQAM and the STB; Secondly, in the existing interactive digital television system applies, video server need be known information such as on the internet IP address of IPQAM data channel mapping, port, and video server could send to above-mentioned passage with this video stream data according to the request of STB; And STB also need could remove to receive its needed video stream data to this passage after the information of knowing IPQAM data sendaisle.The common practices of prior art is that STB manufacturer and video server manufacturer carry out integrated exploitation, and both sides work in coordination.Thus, just need make different settings at different STB and different video servers, efficient is lower, and portability is also relatively poor.
Summary of the invention
Be the low and portable relatively poor technical problem of the interactive digital television system effectiveness that solves prior art, the invention provides a kind of interactive digital television system and portable gateway of promoting based on real time streaming transport protocol.
For addressing the above problem, the technical solution adopted in the present invention is: a kind of gateway based on real time streaming transport protocol, according to different IPQAM mapping rulers, this gateway plays the effect of safeguarding mapping relations, this intra-gateway comprises one group of mapping relations table, and described mapping relations table comprises Streams, Channels and Stream_channel three parts; Wherein, the information of the information of the outside input of Streams table record TS flow data, Channels table record IPQAM channel, Stream_channel table then write down the corresponding relation of Streams table and Channels table.
Compared with prior art, advantage of the present invention is: described gateway plays the function of RTSP agency by agreement between STB and RTSP video server, avoided contacting directly of STB and RTSP video server, so, need not mate modification at different STB and RTSP video server, improved efficient, the realization of real meaning program request and the playback of IPTV.
Description of drawings
Fig. 1 is the IPQAM groundwork cell schematics of prior art;
Fig. 2 is a kind of mapping relations hoist pennants that comprises based on the intra-gateway of real time streaming transport protocol of the present invention;
Fig. 3 is of the present invention a kind of based on the gateway of real time streaming transport protocol and the reciprocal process schematic diagram of STB and RTSPServer.
Embodiment
Below in conjunction with Figure of description, describe the realization and the operation principle thereof of the gateway that the present invention is based on real time streaming transport protocol in detail.Gateway based on real time streaming transport protocol provided by the present invention is used to safeguard the mapping relations between IPQAM channel and the TS stream.
The present invention is based on real time streaming transport protocol gateway a kind of better embodiment as shown in Figure 2.In the present embodiment, described gateway based on real time streaming transport protocol adopts the ATCA server architecture.For safeguarding the mapping relations between IPQAM channel and the TS stream, described intra-gateway based on real time streaming transport protocol has also been set up one group of mapping relations table, and described mapping table comprises Streams, Channels and Stream_channel three parts.Wherein, the information of the outside input of Streams table record TS flow data is as source IP address sip, target ip address dip, source port sport, target port dport and the program address pid etc. of this TS stream; The information of Channels record IPQAM channel is as frequency f req, symbol rate (symbol rate), modulation type modulation, channel spacing type annex and the channel spacing (channel space) etc. of this channel; Stream_channel then writes down Streams table and Channels table corresponding relation between the two, and this corresponding relation can be one to one, also can be the relation of multi-to-multi.So, the TS stream that any one sends to IPQAM can correspond in the IPQAM channel and go.
If STB wishes to receive program request TS video flowing at certain frequency, then only need tell RTSP Agent this frequency point information, RTSP Agent finds from the stream_channel mapping table information that should channel, after the information of IPQAM channel input TS stream, RTSP Agent notice RTSP Server is the transmission destination address of this TS stream, target port is adjusted to destination address and port that should assigned ip QAM channel be got final product, and this moment, STB just can receive the program of its program request.That is to say that RTSPAgent controls the attribute (frequency, symbol rate etc.) of this TS video flowing in broadcast channel by destination address and port that control RTSP Server sends the TS video flowing; Receive program request TS video flowing if wish STB at certain frequency, RTSP Agent need notify RTSP Server the TS video flowing to be sent to information such as assigned ip address, port, by above-mentioned information, RTSPAgent can learn that this TS video flowing is by the broadcast channel attribute (frequency behind the IPQAM after contrasting the stream_channel mapping table again, symbol rate etc.), last RTSP Agent notice STB utilizes above-mentioned parameter to modulate, and STB can be to specifying frequency to remove to receive the TS video flowing.Above-described is the function one of RTSP Agent of the present invention: i.e. resource management function.Under the effect of RTSP Agent, RTSP Server just can know the IP information on the IPQAM channel, RTSP Server is transmitted to STB with it by the information that RTSP Agent is obtained, and so STB promptly can receive the TS stream that sends over from RTSP Server by IPQAM.
For standardized RTSP protocol command, as Describe, Play, Pause, TearDown etc., RTSP Agent as just an intermediary and does not make any change to the content of agreement, it just is transmitted to RTSP Server with the request that STB sent, and the response that RTSP Server has been done simultaneously sends to that STB of the request of making.
After certain STB sent the SETUP request, STB did not also know himself should be tuned on which Frequency point, just can watch the video frequency program of being asked, and this moment, the main task of RTSPAgent was exactly to play the effect of translation.In the SETUP order that STB sent, include the parameter of describing this STB receive mode and receiving ability, after above-mentioned parameter and the IPQAM parameter that configures be analyzed, select a suitable IPQAM channel, this channel pairing IP address and port are used to be provided with RTSP Agent sends field from the transmission head of above-mentioned SETUP order to RTSP Server, after RTSP Server receives with this IP address and port as the destination address that sends TS stream, RTSPServer is after RTSP Agent sends correct response message, the SETUP order that RTSP Agent will send STB responds, and STB receives promptly to may be tuned to after this responses and specifies frequency reception TS flow data to carry out playback.
See also the reciprocal process schematic diagram of RTSP Agent shown in Figure 3 and STB and RTSP Server.RTSPAgent of the present invention has shielded the direct connection relational between STB and the RTSP Server, and the communication process between all STB and the RTSP Server all is to finish by RTSP Agent, concrete reciprocal process such as Fig. 3:
P1:RTSP Agent receives the Describe request of STB, and forwards the request to corresponding RTSPServer; RTSP Agent receives the response of RTSP Server and it is transmitted to STB.
P2: receive the Describe request that RTSP Agent forwards, find associated documents, and the relevant information in the file is sent to RTSPAgent by the Describe response, this wherein also comprises the response of some mistakes.
P3:RTSP Agent receives the SETUP request of STB, after searching the IPQAM resource table, the IPQAM channel that distributes a free time, and this channel the relevant information of corresponding Stream, as target ip address, information such as target port are added to goes in the above-mentioned request and this request is transmitted to RTSP Server.If receive the correct response of RTSP Server, then rewrite this echo message, the IPQAM channel information, be added to as Frequency, Annex, Modulation, SymbolRate, ChannelSpace etc. and remove and to send to STB in this response, instruction notification STB prepares to watch this program; If receive that the response of RTSP Server is wrong, then the IPQAM resource of just having distributed is discharged and be labeled as the free time.
P4: receive the SETUP request that RTSPAgent rewrites, this request is through the processing of P3 step, IP address and port that TS stream will send have been comprised, after RTSP Server receives this request, open the STB demand file, to the data sendaisle, the IP address of preparation in including request and the IPQAM channel transmission TS flow data of port are made SETUP and are responded with information initializings such as this IP address and ports.
P5:RTSP Agent receives the Play order that STB sends, and it is transmitted to RTSP Server, and the response that RTSP Server is made is transmitted to STB.
P6:RTSP Server receives Play, sends the TS flow data to IPQAM, responds; After IPQAM receives data, can be to the digital television broadcasting channel of coordinating according to the P3 step data-modulated, this moment, STB had tuned on this channel, can realize normal program request and playback.
P7: receive the F.F. that STB sends, rewind down or fixed point are play the Play instruction, and it is transmitted to RTSPServer; The response that RTSP Server is made is transmitted to STB.
P8: add F.F., rewind down or the fixed point that receive RTSP Agent forwarding are play the Play instruction, it is done suspend processing, find suitable starting point according to the requirement of request then, send the TS flow data to IPQAM again, respond.
P9: receive the Pause instruction that STB sends, it is transmitted to RTSP Server; The response that RTSP Server is made is transmitted to STB.
P10: receive the Pause instruction that RTSP Agent transmits, suspend the TS flow data and send, and respond to RTSP Agent.
P11: receive the Teardown instruction that STB sends, it is transmitted to RTSP Server, if receive the normal response of RTSP Server, then discharge the IPQAM resource, and respond to STB.
P12: carry out RTSP Teardown instruction process.
Identify by the IP address the Internet owing to can not resemble between IPQAM and the STB, and can only decide by a series of frequency parameters, therefore among the present invention, in the SETUP instruction that STB sends, some parameters have been increased, thereby realize transmitting according to the RTSP agreement between RTSP Agent and the STB, initiate parameter comprises:
CATV: transmission channel, represent that its range of application is the radio network transmission;
Frequency: frequency tuning range;
Annex: frequency interval type, A type or Type B, corresponding different respectively channel spacings;
Modulation: modulation type, 64QAM, 128QAM or 256QAM;
SymbolRate: character rate;
ChannelSpace: channel spacing.
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 these improvement are also answered within apparent protection scope of the present invention.
Claims (7)
1. gateway based on real time streaming transport protocol, according to different IPQAM mapping rulers, described gateway works to safeguard mapping relations, it is characterized in that: this intra-gateway comprises one group of mapping relations table, and described mapping relations table is: Streams, Channels and Stream_channel; The corresponding relation of the information of the outside input of Streams table record TS flow data, information, Stream_channel table record Streams table and the Channels table of Channels table record IPQAM channel.
2. a kind of gateway based on real time streaming transport protocol as claimed in claim 1 is characterized in that: the outside input TS streaming data information of described Streams table record is: source IP address, target ip address, source port, target port and the program address of this TS stream.
3. a kind of gateway based on real time streaming transport protocol as claimed in claim 1 is characterized in that: the information of the IPQAM channel of described Channels table record comprises the frequency of this channel, symbol rate, modulation type, channel spacing type and channel spacing.
4. a kind of gateway based on real time streaming transport protocol as claimed in claim 1 is characterized in that: the corresponding relation of described Streams table and Channels table record information is man-to-man relation.
5. a kind of gateway based on real time streaming transport protocol as claimed in claim 1 is characterized in that: the corresponding relation of described Streams table and Channels table record information is the relation of one-to-many.
6. a kind of gateway based on real time streaming transport protocol as claimed in claim 1 is characterized in that: comprise following parameter in the SETUP instruction that STB sends: transmission channel, frequency tuning range, frequency interval type, modulation type, character rate and channel spacing.
7. as the described a kind of gateway based on real time streaming transport protocol of any claim among the claim 1-6, it is characterized in that: what described gateway adopted is ATCA server framework.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100604897A CN100512241C (en) | 2006-04-25 | 2006-04-25 | Gateway based on real-time flow host-host protocol |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100604897A CN100512241C (en) | 2006-04-25 | 2006-04-25 | Gateway based on real-time flow host-host protocol |
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| Publication Number | Publication Date |
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| CN1921462A true CN1921462A (en) | 2007-02-28 |
| CN100512241C CN100512241C (en) | 2009-07-08 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101365103B (en) * | 2007-08-06 | 2010-06-02 | 中国科学院声学研究所 | Interactive service management method for cable television network |
| CN101977306A (en) * | 2010-11-01 | 2011-02-16 | 深圳市同洲电子股份有限公司 | Two-way video monitoring method and system |
| CN102065269A (en) * | 2010-11-18 | 2011-05-18 | 深圳市同洲电子股份有限公司 | Method for carrying out video session, video session system and set top boxes (STBs) |
| CN102244819A (en) * | 2011-07-01 | 2011-11-16 | 深圳市同洲电子股份有限公司 | Digital television receiving terminal, frequency locking system based on QAM (Queued Access Method) and frequency locking method |
-
2006
- 2006-04-25 CN CNB2006100604897A patent/CN100512241C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101365103B (en) * | 2007-08-06 | 2010-06-02 | 中国科学院声学研究所 | Interactive service management method for cable television network |
| CN101977306A (en) * | 2010-11-01 | 2011-02-16 | 深圳市同洲电子股份有限公司 | Two-way video monitoring method and system |
| CN102065269A (en) * | 2010-11-18 | 2011-05-18 | 深圳市同洲电子股份有限公司 | Method for carrying out video session, video session system and set top boxes (STBs) |
| CN102244819A (en) * | 2011-07-01 | 2011-11-16 | 深圳市同洲电子股份有限公司 | Digital television receiving terminal, frequency locking system based on QAM (Queued Access Method) and frequency locking method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100512241C (en) | 2009-07-08 |
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Assignee: SHENZHEN COSHIP SOFTWARE ELECTRONICS Co.,Ltd. Assignor: SHENZHEN COSHIP ELECTRONICS Co.,Ltd. Contract record no.: 2011440020241 Denomination of invention: Gateway based on real-time flow host-host protocol Granted publication date: 20090708 License type: Exclusive License Open date: 20070228 Record date: 20110622 |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090708 |