CN102938849A - Method for fast switching internet protocol television (IPTV) channels - Google Patents
Method for fast switching internet protocol television (IPTV) channels Download PDFInfo
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- CN102938849A CN102938849A CN2011102325555A CN201110232555A CN102938849A CN 102938849 A CN102938849 A CN 102938849A CN 2011102325555 A CN2011102325555 A CN 2011102325555A CN 201110232555 A CN201110232555 A CN 201110232555A CN 102938849 A CN102938849 A CN 102938849A
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Abstract
The invention relates to the technical field of multimedia application, in particular to a channel switching method. The method for fast switching internet protocol television (IPTV) channels comprises the following steps: switching to another channel during multicast; shutting down a current decoder; restarting the decoder and setting the state of the decoder to be fast forward; starting decoding when the decoder receives streaming media data, and playing a video when a video frame occurs on the decoder; setting the state of the decoder to be normal playing, and decoding an audio video; maintaining an audio frequency clock T1 to be invariant, regulating a system clock T2 in the decoder to prevent the audio frequency from being lost and playing the audio frequency; regulating the tolerance limit value N of the system clock T2 in the decoder on a video clock T3; performing regulation to decrease the difference value between the system clock T2 and the video clock T3 step by step until audio frequency and video frequency are synchronous; and playing the next channel normally. By means of the technical scheme, the method for fast switching IPTV channels can greatly fasten channel switching and provides the fast channel switching function for users.
Description
Technical field
The present invention relates to the multimedia application technical field, be specifically related to a kind of channel switching method.
Background technology
Along with the continuous growth of access band, interactive television (IPTV) has become one of most important multimedia application in integration of three networks field.IPTV is the infrastructure of utilizing broadband cabled TV, as main terminal appliance, provides the multiple digital media service that comprises TV programme with domestic television set by the Internet agreement.
When using IPTV to realize digital media service, often need frequent switching channels.The switching of television channel is slower in the prior art, and particularly the switching of IPTV multicast procedures mid band is slower, generally at 3～5 seconds.In the prior art, in the method to the switching of IPTV channel, adopting " pre-adding group " method is that the user receives two or more channels simultaneously, does not support channel at random to switch, and has the problem that takies the broadband; The research such as Cha user's behavior provides the Extraordinary programme based on channel temperature and user habit for the user, can reduce the channel switching times, but can cause part unexpected winner program not recommended, actually for time delay itself that switch is made improvements; The IPTV product of Microsoft company and is set up a clean culture and is connected after the user sends handover request between the server, fill user's broadcast buffer memory with rate sending data faster.This method need increase the network equipment newly, has increased investment, and when having a large number of users to initiate channel switch request at short notice, can cause the problem that server load is excessive and the network bandwidth is not enough.
Summary of the invention
The method that the object of the present invention is to provide a kind of IPTV channel to switch fast is to solve the problems of the technologies described above.
Technical problem solved by the invention can realize by the following technical solutions:
The method that a kind of IPTV channel switches fast is characterized in that, comprises the steps:
1) terminal equipment in the IPTV system is accepted multicast packet from media server, decoded data and broadcast in the decoder of terminal equipment;
Terminal equipment receives the channel switch request that the user sends in playing process after, terminal equipment switches in multicast procedures selects another channel;
2) terminal equipment is closed the current channel decoder;
3) terminal equipment reopens decoder, and decoder states is set is the F.F. state;
4) decoder receives that stream medium data begins decoding, and after in a single day decoder decoded frame of video, with video playback out, the user began to watch this channel video;
5) decoder states is set is the normal play state to terminal equipment, and the decoding audio frequency and video;
6) terminal equipment keeps audio clock T1 constant, adjusts system clock T2 in the decoder, prevents that audio frequency from losing audio plays;
7) system clock T2 is to video clock T3 tolerance limiting value N in the terminal equipment adjustment decoder, and the assurance video is not lost;
8) terminal equipment progressively reduces the difference between system clock T2 and the video clock T3, until finish audio-visual synchronization;
9) terminal equipment normal play succeeding channel.
The present invention is not carrying out in the situation of the network rebuilding by above-mentioned design, promotes the user and experiences, and with the original traditional IPTV multicast channel switching mode 3-5 delay of second, shortens in the 300MS, has greatly accelerated the switch speed of IPTV channel.
Described terminal equipment can adopt the mode of dynamic multicast to accept multicast packet in multicast procedures from media server.At number of users during less than channel number, the maximum stream flow of dynamic multicast during less than channel number, is equal to unicast traffic at the IPTV concurrent user number.Therefore when number of users is less, can adopt the mode of dynamic multicast.
Described terminal equipment preferred mode of static multicast that adopts in multicast procedures is accepted multicast packet from media server.When the number of users of the network equipment second line of a couplet far surpassed the IPTV channel number, multicast was more and more significant to the saving characteristic of network traffics bandwidth.Therefore need to adopt the mode of static multicast, with the reliability of further lifting IPTV business.Under the static multicast mode, although need to be larger to bandwidth of network, the user channel switch speed is fast, service-aware good.
Step 7) in, described system clock T2 is to described video clock T3 tolerance limiting value N≤0.5s.
Step 8) in, the difference between described system clock T2 and the video clock T3 is not more than 0.5s, and when finishing audio-visual synchronization, the difference between described system clock T2 and the video clock T3 is not more than 0.1s.
Beneficial effect: owing to adopt technique scheme, the present invention is the accelerating channel switch speed greatly, offers fast channel handoff functionality of user.
Description of drawings
Fig. 1 is flow chart of the present invention.
Embodiment
Technological means, the creation characteristic of realizing for the present invention, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
With reference to Fig. 1, the method that a kind of IPTV channel switches fast comprises the steps:
The first step: the terminal equipment in the IPTV system is accepted multicast packet from media server, decoded data and broadcast in the decoder of terminal equipment.Terminal equipment receives the channel switch request that the user sends in playing process after, terminal equipment switches in multicast procedures selects another channel.
Second step: terminal equipment is closed the current channel decoder.
The 3rd step: terminal equipment reopens decoder, and decoder states is set is the F.F. state.
The 4th step: decoder receives that stream medium data begins decoding, and after in a single day decoder decoded frame of video, with video playback out, the user began to watch this channel video.
The 5th step: it is the normal play state that terminal equipment arranges decoder states, and the decoding audio frequency and video.
The 6th step: terminal equipment keeps audio clock T1 constant, adjusts system clock T2 in the decoder, prevents that audio frequency from losing audio plays.
The 7th step: system clock T2 is to video clock T3 tolerance limiting value N in the terminal equipment adjustment decoder, and the assurance video is not lost.
The 8th step: terminal equipment progressively reduces the difference between system clock T2 and the video clock T3, until finish audio-visual synchronization.
The 9th step: terminal equipment normal play succeeding channel.
The present invention is not carrying out in the situation of the network rebuilding by above-mentioned design, promotes the user and experiences, and with the original traditional IPTV multicast channel switching mode 3-5 delay of second, shortens in the 300MS, has greatly accelerated the switch speed of IPTV channel.
Step 7) in, system clock T2 is to video clock T3 tolerance limiting value N≤0.5s.
Step 8) in, the difference between system clock T2 and the video clock T3 is not more than 0.5s, and when finishing audio-visual synchronization, the difference between system clock T2 and the video clock T3 is not more than 0.1s.Difference between system clock T2 and the video clock T3 can be accomplished 0.1s, even 0.05s.
Terminal equipment can adopt the mode of dynamic multicast to accept multicast packet in multicast procedures from media server.At number of users during less than channel number, the maximum stream flow of dynamic multicast during less than channel number, is equal to unicast traffic at the IPTV concurrent user number.Therefore when number of users is less, can adopt the mode of dynamic multicast.Terminal equipment preferred mode of static multicast that adopts in multicast procedures is accepted multicast packet from media server.When the number of users of the network equipment second line of a couplet far surpassed the IPTV channel number, multicast was more and more significant to the saving characteristic of network traffics bandwidth.Therefore need to adopt the mode of static multicast, with the reliability of further lifting IPTV business.Under the static multicast mode, although need to be larger to bandwidth of network, the user channel switch speed is fast, service-aware good.
In the first step of the present invention, switch to the mode of multicast for multicast, channel switches multicast data flow and can also adopt fast sending out to catch up with native multicasting stream.Being equivalent in client like this can fast cache, also can realize the purpose of seamless switching.
More than show and describe basic principle of the present invention and principal character advantage of the present invention.The technical staff of the industry should understand the restriction that the present invention is not subjected to above-mentioned using method; that describes in above-mentioned using method and the specification just says principle of the present invention; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall into the interior claimed scope of the present invention of the claimed scope of the invention and defined by appending claims and equivalent thereof.
Claims (6)
1. the method that the IPTV channel switches fast is characterized in that, comprises the steps:
1) terminal equipment in the IPTV system is accepted multicast packet from media server, decoded data and broadcast in the decoder of terminal equipment;
Terminal equipment receives the channel switch request that the user sends in playing process after, terminal equipment switches in multicast procedures selects another channel;
2) terminal equipment is closed the current channel decoder;
3) terminal equipment reopens decoder, and decoder states is set is the F.F. state;
4) decoder receives that stream medium data begins decoding, and after in a single day decoder decoded frame of video, with video playback out, the user began to watch this channel video;
5) decoder states is set is the normal play state to terminal equipment, and the decoding audio frequency and video;
6) terminal equipment keeps audio clock T1 constant, adjusts system clock T2 in the decoder, prevents that audio frequency from losing audio plays;
7) system clock T2 is to video clock T3 tolerance limiting value N in the terminal equipment adjustment decoder, and the assurance video is not lost;
8) terminal equipment progressively reduces the difference between system clock T2 and the video clock T3, until finish audio-visual synchronization;
9) terminal equipment normal play succeeding channel.
2. the quick method of switching of a kind of IPTV channel according to claim 1 is characterized in that: step 7) in, described system clock T2 is to described video clock T3 tolerance limiting value N≤0.5s.
3. the quick method of switching of a kind of IPTV channel according to claim 2 is characterized in that: step 8) in, the difference between described system clock T2 and the video clock T3 is not more than 0.5s.
4. the quick method of switching of a kind of IPTV channel according to claim 3 is characterized in that: step 8) in, when finishing audio-visual synchronization, the difference between described system clock T2 and the video clock T3 is not more than 0.1s.
5. the method that the described a kind of IPTV channel of any one switches fast in 4 according to claim 1, it is characterized in that: terminal equipment adopts the mode of dynamic multicast to accept multicast packet in multicast procedures from media server.
6. the method that the described a kind of IPTV channel of any one switches fast in 4 according to claim 1, it is characterized in that: terminal equipment adopts the mode of static multicast to accept multicast packet in multicast procedures from media server.
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| CN2011102325555A CN102938849A (en) | 2011-08-15 | 2011-08-15 | Method for fast switching internet protocol television (IPTV) channels |
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| CN2011102325555A CN102938849A (en) | 2011-08-15 | 2011-08-15 | Method for fast switching internet protocol television (IPTV) channels |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104284227A (en) * | 2013-07-05 | 2015-01-14 | 上海帕科软件科技有限公司 | Mobile phone remote control television system |
| US10694240B2 (en) | 2016-11-16 | 2020-06-23 | Interdigital Ce Patent Holdings | Method for decoding an audio/video stream and corresponding device |
| CN113329262A (en) * | 2021-05-28 | 2021-08-31 | 海信视像科技股份有限公司 | Display equipment and control method for switching playing backup signal source |
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| US20060041679A1 (en) * | 2000-12-15 | 2006-02-23 | International Business Machines Corporation | Application server and streaming server streaming multimedia file in a client specified format |
| CN101197962A (en) * | 2008-01-03 | 2008-06-11 | Ut斯达康通讯有限公司 | Fast and smooth channel switching method for IPTV set top box |
| CN101267545A (en) * | 2008-04-30 | 2008-09-17 | 中兴通讯股份有限公司 | A program switching method and device |
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- 2011-08-15 CN CN2011102325555A patent/CN102938849A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060041679A1 (en) * | 2000-12-15 | 2006-02-23 | International Business Machines Corporation | Application server and streaming server streaming multimedia file in a client specified format |
| CN101197962A (en) * | 2008-01-03 | 2008-06-11 | Ut斯达康通讯有限公司 | Fast and smooth channel switching method for IPTV set top box |
| CN101267545A (en) * | 2008-04-30 | 2008-09-17 | 中兴通讯股份有限公司 | A program switching method and device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104284227A (en) * | 2013-07-05 | 2015-01-14 | 上海帕科软件科技有限公司 | Mobile phone remote control television system |
| US10694240B2 (en) | 2016-11-16 | 2020-06-23 | Interdigital Ce Patent Holdings | Method for decoding an audio/video stream and corresponding device |
| CN113329262A (en) * | 2021-05-28 | 2021-08-31 | 海信视像科技股份有限公司 | Display equipment and control method for switching playing backup signal source |
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