CN101605204A - Reduce the channel conversion time method of digital video input - Google Patents
Reduce the channel conversion time method of digital video input Download PDFInfo
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- CN101605204A CN101605204A CNA2009101515803A CN200910151580A CN101605204A CN 101605204 A CN101605204 A CN 101605204A CN A2009101515803 A CNA2009101515803 A CN A2009101515803A CN 200910151580 A CN200910151580 A CN 200910151580A CN 101605204 A CN101605204 A CN 101605204A
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Abstract
A kind of method that is used for transferring to from the analog channel conversion digital channel conversion may further comprise the steps: stop analog video and show; Receive the numeral input; Restart the demultiplexing of described numeral input handles with previous channel buffer; Change the bag identifier of the filtration output of the described digital described demultiplexing processing of importing; And regulate from the display filter of the digital information of described filtration acquisition.Reduced the channel conversion time by technical scheme of the present invention.
Description
The application divides an application, and the application number of its original bill application is 200480043821.8, and the applying date is on August 25th, 2004, and denomination of invention is " equipment and the method that reduce the channel conversion time of digital video input ".
Technical field
The present invention relates generally to digital television system, and relate in particular to by switching activity (active) bag identifier PID and carry out rapid channel change.
Background technology
The canonical process that begins and stop video during the changed digital channel comprises: obtain channel buffer information, the channel distribution buffer resource is selected demultiplexer packet identifiers, obtains Motion Picture Experts Group (MPEG) header, distribute the display buffer, and the beginning video shows.Included beginning and stop this process of video during the channel conversion has caused the increase of the channel conversion time during the channel conversion and the increase of blanking time.Compare with the channel conversion time of simulated television, the channel conversion time of this increase is oversize.
Therefore, for digital video stream applications, need the rapid channel change time.
Summary of the invention
A kind of equipment that is used for the channel of changed digital inlet flow comprises: decoding hardware in response to from the input of the new data of video flowing, and reinitializes the video decode variable and to video data decoding; And memory, storage is by the video content of being decoded by described decoding hardware, will show by display unit, and described memory keeps the current video content to be used for showing, till receiving the new data of being decoded by described decoding hardware.
A kind of method that is used for the channel of changed digital inlet flow may further comprise the steps: receive the numeral input; In response to selective information channel, and filter this numeral input from this numeral input; Detect digital video information from this numeral input; And this digital video information distributed to memory so that show.
A kind of method that is used for transferring to from the analog channel conversion digital channel conversion may further comprise the steps: stop analog video and show; Receive the numeral input; Restart the demultiplexing of this numeral input handles with previous channel buffer; Change the bag identifier of the filtration output that the demultiplexing of this numeral input handles; And regulate from the display filter of the digital information of this filtration acquisition.
Description of drawings
Consider following explanation together with accompanying drawing, can more completely understand the present invention, wherein:
Fig. 1 is the block diagram that is used to implement the exemplary television set hardware configuration of digital channel conversion of the present invention;
Fig. 2 is the exemplary state transition diagram that illustrates according to the difference between analog channel conversion of the present invention and the digital channel conversion;
Fig. 3 is the flow chart that stops the step of channel conversion processing according to the present invention; And
Fig. 4 is the flow chart that begins the step of channel conversion processing according to the present invention.
For ease of understanding,, use identical Reference numeral to represent the similar elements that these accompanying drawings are common if possible.
Embodiment
With reference to figure 1, it shows the block diagram 100 of the exemplary television set hardware configuration that is used to implement channel conversion of the present invention.This hardware configuration comprises with analog video handles Digital Video Processing path in parallel, path.In the Digital Video Processing path, the mpeg stream that tuner 101 is received is transmitted stream decoder 102 decodings, and this transport stream decoder 102 is carried out bag identifier PID and filtered.Transport stream decoder 102 is extracted video, audio frequency and other data from mpeg stream.The video data that is extracted is sent to video channel buffer 103, and the voice data that is extracted is sent to audio channel buffer 104, and other data are sent to other corresponding data buffer zone 105.This other data buffer zone 105 keeps for other data communication.In fact, we can flow with data sharing. and it seems has digital storage media-order and other form of controlling (DSM-cc) or digital television application software environment (DASE) standard as us.Information in the video channel buffer 103 is decoded in mpeg video decoder 106, and is sent to display buffer 111 parts of memory 114.Then, the information of display buffer 111 is shown processor 115 and figure and screen display generator 116 and handles, so that show in display device output 109.Information in the audio channel buffer 104 is decoded in audio decoder 107, is sent to audio buffer 112 then, and audio process 117 can obtain this information in the audio buffer 112 so that handle, and plays by audio frequency apparatus output 118.Other data are sent to other data processor 108.We can have other application with this data communication.Other data are not defined as video or audio frequency, so it can be the data of any kind.Handle in the path at analog video, the video flowing that tuner 101 is received is decoded by NTSC's standard (NTSC) decoder 110, and is addressed to video-stream processor and figure and the screen display osd generator 115 that is connected to display device output.
In Digital Television (TV) system, in order to reduce the channel conversion time, can show the content of current channel buffering area, till can obtaining new input data.After obtaining new input data, digital television system can reinitialize video decode variable and data structure, and restarts decoding and demonstration with new data.If can not from new input, find effective video stream, then screen in the end the last frame of channel data freeze.After switching to new input, if system find new effective mpeg header, to avoid the unstable frame on the screen, just can add new frame at black-out intervals.
Under the situation of sub-channel conversion, as long as at identical Program Association Table (PAT) inner conversion channel, this process just provides enough fast switching.Even the physical channel in tuner has changed, this process also is suitable for digital channel to digital channel.If the tuning period in the tuner is not enough fast, the unique difference that then can see is the minority freeze frame from previous channel.
Compare to the situation of digital channel conversion with numeral, switch to analog channel or switch needs step still less from analog channel.With reference to figure 2, exemplary state transition diagram 200 shows the difference of the treatment step that is used for channel change in analog video input and the digital video input, and moving between simulation and the digital channel map function.
Analog channel pattern conversion 201 times, shown video is stopped, and restarts to show 202 with the new video source.Moving on to the process of digital channel 203 from analog channel, system stops display video, restarts demultiplexing with old channel buffer and handles, and changes the bag identifier PID of filter, and regulates display filter 206.In case digital channel pattern conversion 203 times, system just changes the bag identifier, and regulates display buffer 204.Moving on to the analog channel conversion from the digital channel conversion comprises: stop demultiplexing and handle, input video source is switched to simulation from numeral, and beginning display simulation source 205.
State transitions Figure 200 shows, when transferring to analog channel, system only need stop to obtain data and staying channel buffer, and when transferring to digital channel, only need after cleaning, to restart, so system can save the time of redistributing channel buffer and creating new data structure with this channel buffer.
Changed digital channel needs are by the system handles that stops channel conversion of two kinds of distinct processing mode: Fig. 3 of digital system according to the present invention, and the system handles of the beginning channel conversion of Fig. 4.
With reference to the flow chart 300 of figure 3, stop video input 301, and check whether the current video input is analog input 302.If the current video input is not analog input, then last input is numeral input 306, and system is configured to keep showing current program data 307.If the current video input is analog input, then last input is analog input 303.System is configured to stop to show from the display buffer, removes and distributes display buffer 304.System further is configured to, and stops to handle the digital program input and removes distribution analog input buffering area 305.
In a word, Fig. 3 shows the process that stops to handle in the video driver and is, if digital channel just just keeps previous channel data.If analog input, then this process stops to show input source, and removes and distribute the display buffer, stops to handle input then.The last input type that preservation begins to handle.
The block diagram 400 of Fig. 4 shows the process that channel conversion begins to handle and depends on input type.As explaining in the state transition diagram, handle the path and depend on the input source type, simulation or numeral, and the last input type under arbitrary situation.
Video input Once you begin 401 if new input is 402 of a numeral, is then at first carried out the channel buffer inspection, because there is not channel distribution buffering area 403 for the first time.If there is not channel distribution buffering area 403, then this processing is created channel buffer 412 for the first time, and this channel buffer will last till that processor is reset or detects till the serious problems.If last input is analog input 404, then reuse old channel buffer, clean legacy data 405, and receive data 406.If last input is numeral input 404, then demultiplexing 407 is leapt in this processing.Demultiplexing is handled and is comprised the active packet identifiers 407 that changes the PID filter, and this processing is waited until and detected new mpeg data 408 then.If new video information is identical with final video information 409, then begins video and show 411.If new video information is different with final video information, then before showing 411, the beginning video redistributes the display buffer, to preserve new video information.
For analog input, this is handled and checks last input.If last input is digital, then stop to show and demultiplexing, handle new analog input then, and begin to show new input.More particularly, if new input is analog input 402, and input is analog input at last, then distribute the analog input data so that handle 416 to the input block, and the analog input data after the allocation process of display buffer is so that show 417.If new input is analog input 402, and last input is numeral input 413, then stops video and shows 414, and stop to handle the numeral input of handling from demultiplexing 415.Then,, distribute the display buffer distributing the input block so that after handling input 416, and beginning analog video 417.
Though be shown specifically and described the various embodiment that instruct in conjunction with the present invention at this, those skilled in the art can design easily will be in conjunction with other multiple alternate embodiment of these instructions.
Claims (4)
1. method that is used for transferring to from the analog channel conversion digital channel conversion may further comprise the steps:
Stopping analog video showing;
Receive the numeral input;
Restart the demultiplexing of described numeral input handles with previous channel buffer;
Change the bag identifier of the filtration output of the described digital described demultiplexing processing of importing; And
Adjusting is from the display filter of the digital information of described filtration acquisition.
2. method according to claim 1 is wherein carried out described filtration by the transport stream decoder with the filtration of bag identifier.
3. method according to claim 1 is wherein carried out described demultiplexing by transport stream decoder and is handled.
4. method according to claim 1 further comprises Motion Picture Experts Group's decoding is carried out in the output of described filtration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009101515803A CN101605204A (en) | 2004-08-25 | 2004-08-25 | Reduce the channel conversion time method of digital video input |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2009101515803A CN101605204A (en) | 2004-08-25 | 2004-08-25 | Reduce the channel conversion time method of digital video input |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004800438218A Division CN100534155C (en) | 2004-08-25 | 2004-08-25 | Reducing channel changing time for digital video inputs |
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| CN101605204A true CN101605204A (en) | 2009-12-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010072134A1 (en) * | 2008-12-22 | 2010-07-01 | Mediatek Inc. | Signal processing apparatuses capable of processing initially reproduced packets prior to buffering the initially reproduced packets |
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- 2004-08-25 CN CNA2009101515803A patent/CN101605204A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010072134A1 (en) * | 2008-12-22 | 2010-07-01 | Mediatek Inc. | Signal processing apparatuses capable of processing initially reproduced packets prior to buffering the initially reproduced packets |
| US8321767B2 (en) | 2008-12-22 | 2012-11-27 | Mediatek Inc. | Packet processing apparatus and method capable of generating modified packets by modifying payloads of specific packets identified from received packets |
| US8902893B2 (en) | 2008-12-22 | 2014-12-02 | Mediatek Inc. | Packet processing apparatus and method capable of generating modified packets by modifying payloads of specific packets identified from received packets |
| US8910233B2 (en) | 2008-12-22 | 2014-12-09 | Mediatek Inc. | Signal processing apparatuses capable of processing initially reproduced packets prior to buffering the initially reproduced packets |
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Open date: 20091216 |