CN101472154A - Method for switching digital channel and device for processing digital video - Google Patents
Method for switching digital channel and device for processing digital video Download PDFInfo
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- CN101472154A CN101472154A CNA2007100328995A CN200710032899A CN101472154A CN 101472154 A CN101472154 A CN 101472154A CN A2007100328995 A CNA2007100328995 A CN A2007100328995A CN 200710032899 A CN200710032899 A CN 200710032899A CN 101472154 A CN101472154 A CN 101472154A
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Abstract
The invention discloses a digital channel switching method comprising the following steps: video data provided by a channel next to a playing channel is received, and video data of at least one video data internal frame in the channel next to the playing channel is stored in a pre-buffer; and when the playing channel is switched for the next channel, the video data of at least one video data internal frame in the channel next to the playing channel is removed from the pre-buffer, and is decoded for playing. Meanwhile, the invention further discloses a digital video processing device. By adopting the method and the digital video processing device which are provided by the invention, the purpose of saving the time of establishing conversation with a network-side television server, standing by for the release of coded data and waiting for the internal frame can be achieved while switching channels, so that the invention can achieve the effects of accelerating the channel switching speed and improving of the comfort level of a user's experience.
Description
Technical field
The present invention relates to network communication field, relate in particular to a kind of digital channel switching method and a kind of device for processing digital video.
Background technology
Present digital video broadcasting (Digital Video Broadcast, DVB) in the system, video code model adopts the MPEG-2 form mostly, (Internet Protocol Television IPTV) in the business, adopts the MPEG-2 form mostly in IP-based television services system, or MPEG-4 form, or form H.264, in these source encoding algorithms, substantially all with three kinds of mode compressed video pictures.These forms comprise compression in the frame, promptly all use the information in this frame to compress, and the condensed frame that obtains thus is called the I frame; Or the interframe compression, not only utilize in this frame, also utilize the Information Compression of consecutive frame, the condensed frame that obtains thus is called the P frame; Or utilizing consecutive frame to carry out bi-directional predicted compression, the condensed frame that obtains thus is the B frame.It is bigger that the I frame contains amount of information, do not need the information of other frame just can to decode by decoded device, thereby I frame data amount is big; And the compression ratio of P frame is higher, but needs the information of frame before to decode, and the B frame needs the information decoding of adjacent frame, and the compression ratio of B frame is the highest.Encoder generally can insert the I frame periodically in encoding code stream, as the random access point of decoder.In order to reduce code stream, the cycle of I frame is fixing compromise value, be generally 2 seconds, and like this when video terminal is play live class program, must wait until that an I frame could begin decoding after switching to new channel, in the IPTV system, terminal and server connect time, demultiplexing time, wait for time of I frame, buffer time, channel switch occupied in total time spent very most of, effect when causing channel to switch can not be satisfactory, can not reach the purpose of quick switching.
Summary of the invention
Have mirror therewith, the main purpose of the embodiment of the invention provides digital channel switching method and device for processing digital video, is used to realize that fast channel switches.
A kind of digital channel switching method of the embodiment of the invention comprises:
Receive the video data of the adjacent channel of broadcasting channel, and deposit the video data of at least one the video data frame interior in the adjacent channel of broadcasting channel in pre-buffering area;
When switching to the adjacent channel of described broadcasting channel, read the video data of at least one the video data frame interior the adjacent channel of described broadcasting channel from described pre-buffering area, and decoding is play.
A kind of device for processing digital video in the embodiment of the invention comprises:
Receiving element is used to receive the video data of the adjacent channel of the video data of broadcasting channel and described broadcasting channel;
Buffer cell is used for the video data of buffer memory broadcasting channel;
Pre-buffer cell is used for the video data of the adjacent channel of buffer memory and described broadcasting channel;
Decoding unit, the video data of the described buffer cell buffer memory that is used for decoding, or after channel switches, the video data of buffer memory in the described pre-buffer cell of decoding;
Switch unit is used for when channel switches, and controls described decoding unit and switches to pre-buffer unit reading video data from the buffering unit.
Implement the embodiment of the invention, the video data of the adjacent channel by receiving broadcasting channel, and the video data of adjacent channel that will comprise the broadcasting channel of at least one video data frame interior deposits pre-buffering area in, when switching to the adjacent channel of described broadcasting channel, read the video data and the decoding of the adjacent channel of the described broadcasting channel that comprises at least one video data frame interior plays from described pre-buffering area, realized when channel switches, saved with the network side television server and set up session, the time of transferring and waiting for frame interior Deng data to be encoded, thereby effectively accelerated the channel switch speed, increased the user experience comfort level.
Description of drawings
Fig. 1 is that first embodiment of device for processing digital video of the present invention forms schematic diagram;
Fig. 2 is that second embodiment of device for processing digital video of the present invention forms schematic diagram;
Fig. 3 is the schematic flow sheet of digital channel changing method first embodiment of the present invention;
Fig. 4 is the schematic flow sheet of digital channel changing method second embodiment of the present invention.
Embodiment
In order to make technical scheme of the present invention and advantage clearer, the embodiment of the invention is further elaborated below in conjunction with the accompanying drawing embodiment that develops simultaneously.
With reference to figure 1, be that first embodiment of device for processing digital video of the present invention forms schematic diagram.The described device for processing digital video of present embodiment is mainly used in the IP-based television services system (IPTV), described video process apparatus mainly comprises receiving element 11, the first pre-buffer cell 12, buffer cell 13, the second pre-buffer cell 14, switch unit 15 and decoding unit 16, is described in detail respectively below:
The video data of the adjacent channel of receiving element 11, the video data that is used to receive broadcasting channel and described broadcasting channel.
Herein, described broadcasting channel is meant the current television channel of watching of user, the adjacent channel of described broadcasting channel is meant in the rendition list of televising and the described current adjacent television channel before and after the television channel of watching, the TV program list number order that is provided with as a certain user: 11, central authorities' 4 covers; 12, central authorities' 5 covers; 13, central authorities' 6 covers; 14, central authorities' 7 covers; 15, central authorities' 8 covers, at this moment, if the current television channel of watching is central authorities' 6 covers, then its adjacent channel is central authorities' 5 covers and central authorities' 7 covers.Certainly, the adjacent channel of the current television channel of watching of user also can be each two cover before and after comprising quadruplet television channel altogether, if the current television channel of watching is central authorities' 6 covers, then its adjacent channel is central authorities' 4 covers, central authorities' 5 cover central authorities, 7 covers and central authorities' 8 covers.
The first pre-buffer cell 12 and the second pre-buffer cell 14, be used for the video data of the adjacent channel of buffer memory and described broadcasting channel.
Herein, in the present embodiment, be provided with the first pre-buffer cell 12 and the second pre-buffer cell 14 totally two pre-buffer cells, be respectively applied for the video data of tandem two adjacent channels of buffer memory broadcasting channel, according to the corresponding description of front, can be by the more video data of the adjacent channel in the wide region of more pre-buffer cell buffer memory be set.
In embodiments of the present invention, need the video data stream that deposits pre-buffer cell in is retrieved, to locate the video data frame interior in this video data stream, after navigating to the video data frame interior, with this video data frame interior (also being the I frame) with and subsequently video data stream deposit described pre-buffer cell in, when retrieval and when navigating to follow-up I frame, empty described pre-buffer cell, and will this follow-up I frame with and subsequently video data stream deposit described pre-buffer cell in.During specific implementation, described pre-buffer cell can be realized based on the form of the buffer queue of first-in first-out, generally speaking, the cycle of I frame is 1 to 2 second, based on this design, described pre-buffer cell only needs the video data of buffer memory in 1 to 2 second time period, has saved spatial cache effectively for this reason, simultaneously, guaranteed that pre-team's data of delaying formation are always the I frame.It will be appreciated by those skilled in the art that the description for pre-buffering area only is a kind of concrete execution mode here, can the longer video data of cache-time as pre-buffer cell, all be belong to the present invention to conceive down, and can realize the object of the invention.
Buffer cell 13, be used for the video data of buffer memory broadcasting channel.
Herein, during specific implementation, described buffer cell 3 can be realized based on the buffer queue of first-in first-out.
Decoding unit 15, the video data of the described buffer cell buffer memory that is used for decoding, or after channel switches, the video data of buffer memory in the described pre-buffer cell of decoding.
Switch unit 16, be used for when channel switches, described pre-buffer cell is switched to buffer cell.
Herein, as user not during switching channels, described decoding unit 5 reading video data and it is decoded from described buffer cell 3, when receiving user's channel switch request, as the user based on channel list switching channels in turn upwards, described switch unit 6 will control described decoding unit switch to switch after the corresponding pre-buffer cell reading video data of channel, after the switching, former pre-buffer cell becomes the buffer cell of broadcasting channel data, former buffer cell becomes the pre-buffer cell of the former broadcasting channel of buffer memory, for example, as the TV program list number order that is provided with a certain user as: 11, central authorities' 4 covers; 12, central authorities' 5 covers; 13, central authorities' 6 covers; 14, central authorities' 7 covers; 15, central authorities' 8 covers, at this moment, if the current television channel of watching is central authorities' 6 covers, when channel switches to central authorities' 7 covers, the former pre-buffer cell of buffer memory central authorities 7 programs video datas becomes the buffer cell of central authorities' 7 programs video datas of broadcast, the former buffer cell of buffer memory central authorities 6 programs video datas becomes the pre-buffer cell of the central 6 programs video datas of buffering, and the former buffer cell of buffer memory central authorities 5 programs video datas becomes the pre-buffer cell of the central 8 programs video datas of buffering.
The pre-buffer cell of the video data of the adjacent channel of present embodiment by being provided for the buffer memory broadcasting channel, and after receiving the video data of broadcasting channel adjacent channel, retrieve the I frame in the described video data, this I frame of buffer memory and the follow-up video data of this I frame after retrieving the I frame, when retrieval and when navigating to follow-up I frame, empty pre-buffer cell, and will this follow-up I frame with and subsequently video data stream deposit described pre-buffer cell in, when the user switches to adjacent channel based on channel list with broadcasting channel, read I frame and subsequent video data from corresponding pre-buffer cell based on buffer queue, based on the described video data of this I frame decoding, with respect to prior art, saved with the network side television server and set up session, the time of transferring and waiting for the I frame Deng data to be encoded, thereby effectively accelerated the channel switch speed, increased the user experience comfort level, in addition under the situation that bandwidth allows, can reach channel switching rate faster by the more pre-buffer cell of the adjacent channel of wide region (as four pre-buffer cells are set) is set.
With reference to figure 2, be that second embodiment of device for processing digital video of the present invention forms schematic diagram.The described device for processing digital video of present embodiment is mainly used in the digital broadcast television system, in digital broadcast television system, adopt the digital modulation mode propagation data, terminal (as the teaching machine top box) receiving digital television multiplexed signals, described TV multiplexed signals has comprised whole TV channel signal that the user can enjoy.The difference of first embodiment of described device for processing digital video of present embodiment and device for processing digital video of the present invention is, described receiving element 21 received for having comprised the TV multiplexed signals of whole TV channel signal that the user can enjoy.During specific implementation, described receiving element 21 mainly comprises:
Multiplexed signals receiving element 211 is used for the receiving digital television multiplexed signals.
In the present embodiment, because the signal that digital broadcast television system sends to each user terminal is the signal that comprises whole television channels that the user can enjoy, for this reason under the condition that spatial cache allows, more pre-buffer unit can be set, realize the more adjacent channel buffering of wide region, and then realize that channel switches faster.
With reference to figure 3, be the schematic flow sheet of digital channel changing method first embodiment of the present invention.The digital channel changing method of present embodiment is mainly used among first embodiment of video process apparatus of the present invention, and described method mainly may further comprise the steps:
Step s301, the video data of the video data of reception broadcasting channel and the adjacent channel of broadcasting channel.
Herein, described broadcasting channel is meant the current television channel of watching of user, when described the adjacent channel of broadcasting channel be meant in the rendition list of televising with the described current television channel of watching before and after adjacent television channel, as the TV program list numbering that is provided with a certain user smoothly as: 11, central authorities' 4 covers; 12, central authorities' 5 covers; 13, central authorities' 6 covers; 14, central authorities' 7 covers; 15, central authorities' 8 covers, at this moment, if the current television channel of watching is central authorities' 6 covers, then its adjacent channel is central authorities' 5 covers and central authorities' 7 covers.Certainly, the adjacent channel of the current television channel of watching of user also can be each two cover before and after comprising quadruplet television channel altogether, if be central authorities' 6 covers as the current television channel of watching, then its adjacent channel is central authorities' 4 covers, central authorities' 5 cover central authorities, 7 covers and central authorities' 8 covers.
Step s302 deposits the video data of received broadcasting channel in buffering area, deposits the video data of the adjacent channel of a broadcasting channel in pre-buffering area.
, in the present embodiment, when specifically implementing, a plurality of pre-buffering areas can be set herein, be used to cushion the video data of each adjacent channel.In the present embodiment, need the video data stream that deposits pre-buffering area in is retrieved, to locate the video data frame interior in this video data stream, after navigating to the video data frame interior, with this video data frame interior (also being the I frame) with and subsequently video data stream deposit described pre-buffering area in, when retrieval and when navigating to follow-up I frame, empty described pre-buffer cell, and will this follow-up I frame with and subsequently video data stream deposit described pre-buffering area in.During specific implementation, described pre-buffering area can be realized based on the form of the buffer queue of first-in first-out, generally speaking, the cycle of I frame is 1 to 2 second, based on this design, described pre-buffering area only needs the video data of buffer memory in 1 to 2 second time period, has effectively saved spatial cache for this reason, simultaneously, guaranteed that the pre-correct data of delaying formation are always the I frame.It will be appreciated by those skilled in the art that the description for pre-buffering area only is a kind of concrete execution mode here, can the longer video data of cache-time as pre-buffering area, all be belong to the present invention to conceive down, and can realize the object of the invention.
Step s303, decoding unit reads the video data of broadcasting channel from buffering area, and decodes and play.
Herein, when the user does not ask channel to switch, decoding unit from the buffering area reading video data, its back of decoding is play by follow-up corresponding broadcast unit.
Step s304, user's inputting channel switching command, decoding unit is play from described pre-buffering area reading video data and decoding.
As the user based on channel list switching channels in turn upwards, described switch unit 6 will control described decoding unit switch to switch after the corresponding pre-buffer cell reading video data of channel, after the switching, former pre-buffering area becomes the buffering area of broadcasting channel data, former buffering area becomes the pre-buffering area of the former broadcasting channel of buffer memory, for example, as the TV program list number order that is provided with a certain user as 11, central authorities' 4 covers; 12, central authorities' 5 covers; 13, central authorities' 6 covers; 14, central authorities' 7 covers; 15, central authorities' 8 covers, at this moment, if the current television channel of watching is central authorities' 6 covers, when channel switches to central authorities' 7 covers, the former pre-buffering area of buffer memory central authorities 7 programs video datas becomes the buffering area of central authorities' 7 programs video datas of broadcast, the former buffering area of buffer memory central authorities 6 programs video datas becomes the pre-buffering area of the central 6 programs video datas of buffering, and the former buffer cell of buffer memory central authorities 5 programs video datas becomes the pre-buffer cell of the central 8 programs video datas of buffering.
With reference to figure 2, be that second embodiment of video process apparatus of the present invention forms schematic diagram.The described video process apparatus of present embodiment is mainly used in the digital broadcast television system, in digital broadcast television system, adopt the digital modulation mode propagation data, terminal (as the teaching machine top box) receiving digital television multiplexed signals, described TV multiplexed signals has comprised whole TV channel signal that the user can enjoy.The difference of first embodiment of described video process apparatus of present embodiment and video process apparatus of the present invention is, described receiving element 21 received for having comprised the TV multiplexed signals of whole TV channel signal that the user can enjoy.During specific implementation, described receiving element 21 mainly comprises:
Multiplexed signals receiving element 211 is used for the receiving digital television multiplexed signals.
In the present embodiment, because the signal that digital broadcast television system sends to each user terminal is the signal that comprises whole television channels that the user can enjoy, for this reason under the condition that spatial cache allows, more pre-buffer unit can be set, realize the more adjacent channel buffering of wide region, and then realize that channel switches faster.
With reference to figure 4, be the schematic flow sheet of digital channel changing method second embodiment of the present invention.The digital channel changing method of present embodiment is mainly used among second embodiment of video process apparatus of the present invention, and described method mainly may further comprise the steps:
Step s401, the receiving digital television multiplexed signals.
In digital broadcast television system, adopt the digital modulation mode propagation data, terminal (as the teaching machine top box) receiving digital television multiplexed signals, described TV multiplexed signals has comprised whole TV channel signal that the user can enjoy.
Step s402 carries out demultiplexing to received Digital Television multiplexed signals, obtains the video data of the adjacent channel of the video data of broadcasting channel and described broadcasting channel.
Step s403 deposits the video data of received broadcasting channel in buffering area, deposits the video data of the adjacent channel of a broadcasting channel in pre-buffering area.
Herein, described step s403 is identical with described step s302, does not repeat them here.
Step s404, decoding unit reads the video data of broadcasting channel from buffering area, and decodes and play.
Herein, when the user does not ask channel to switch, decoding unit from the buffering area reading video data, its back of decoding is play by follow-up corresponding broadcast unit.
Step s405, user's inputting channel switching command, decoding unit is play from described pre-buffering area reading video data and decoding.
Herein, described step s405 is identical with step s405, does not repeat them here.
Above disclosed only is a kind of preferred embodiment in the embodiment of the invention, can not limit the present invention's interest field certainly with this, and therefore the equivalent variations of doing according to claim of the present invention still belongs to the scope that the present invention is contained.
Claims (8)
1, a kind of digital channel switching method is characterized in that, comprising:
Receive the video data of the adjacent channel of broadcasting channel, and deposit the video data of at least one the video data frame interior in the adjacent channel of broadcasting channel in pre-buffering area;
When switching to the adjacent channel of described broadcasting channel, read the video data of at least one the video data frame interior the adjacent channel of described broadcasting channel from described pre-buffering area, and decoding is play.
2, the method for claim 1 is characterized in that, the step that the video data of the adjacent channel of the described broadcasting channel that will comprise at least one video data frame interior deposits pre-buffering area in is specially:
The video data of the adjacent channel of the broadcasting channel that retrieval receives when retrieving the video data frame interior, deposits the video data after this video data frame interior and this video data frame interior in pre-buffering area.
3, the method for claim 1 is characterized in that, also comprises step:
Receive the video data of broadcasting channel and deposit the video data of described broadcasting channel in buffering area;
Read the video data and the decoding of described broadcasting channel plays from described buffering area.
As any described method of claim 1 to 3, it is characterized in that 4, the video data of the described adjacent channel that reads the described broadcasting channel that comprises at least one video data frame interior from described pre-buffering area and the step that decoding is play are specially:
Video data after described pre-buffering area reads described video data frame interior and this video data frame interior;
The described video data frame interior of decoding obtains the decoded data of video data frame interior;
Based on decode video data after the described video data frame interior of the decoded data of described video data frame interior.
5, a kind of device for processing digital video comprises it is characterized in that the buffer cell of the video data that is used for the buffer memory broadcasting channel, also comprises:
Receiving element is used to receive the video data of the adjacent channel of the video data of broadcasting channel and described broadcasting channel;
Pre-buffer cell is used for the video data of the adjacent channel of buffer memory and described broadcasting channel;
Decoding unit, the video data of the described buffer cell buffer memory that is used for decoding, or after channel switches, the video data of buffer memory in the described pre-buffer cell of decoding;
Switch unit is used for when channel switches, and controls described decoding unit and switches to pre-buffer unit reading video data from the buffering unit.
6, device for processing digital video as claimed in claim 5 is characterized in that, is applied to digital television system, and described receiving element comprises:
The multiplexed signals receiving element is used for the receiving digital television multiplexed signals;
Demultiplexing unit is used for the received Digital Television multiplexed signals of described multiplexed signals receiving element is carried out demultiplexing, obtains the video data of the adjacent channel of the video data of broadcasting channel and described broadcasting channel.
7, device for processing digital video as claimed in claim 5 is characterized in that, the video data with adjacent channel described broadcasting channel buffer memory is the video data that comprises at least one video data frame interior in the described pre-buffer unit.
8, as any described device for processing digital video of claim 5 to 7, it is characterized in that described device for processing digital video is applied in the top box of digital machine.
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| CNA2007100328995A CN101472154A (en) | 2007-12-27 | 2007-12-27 | Method for switching digital channel and device for processing digital video |
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| CN101854382A (en) * | 2010-04-26 | 2010-10-06 | 上海乐毅信息科技有限公司 | Optimization method for monitoring transmission of video in 3G network |
| CN101980541A (en) * | 2010-11-23 | 2011-02-23 | 华亚微电子（上海）有限公司 | Digital television receiving device and channel-switching method thereof |
| CN101984655A (en) * | 2010-11-23 | 2011-03-09 | 华亚微电子（上海）有限公司 | Digital television receiving system and channel changing method |
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| CN104768033B (en) * | 2015-04-15 | 2017-09-19 | 广州市汉融软件有限公司 | A kind of channels of network TV fast switch over method and system based on preloading |
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