CN1925596A - Individual video storing device and its image playing method - Google Patents
Individual video storing device and its image playing method Download PDFInfo
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- CN1925596A CN1925596A CN 200510029357 CN200510029357A CN1925596A CN 1925596 A CN1925596 A CN 1925596A CN 200510029357 CN200510029357 CN 200510029357 CN 200510029357 A CN200510029357 A CN 200510029357A CN 1925596 A CN1925596 A CN 1925596A
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Abstract
This invention relates to one personal visual memory device and image play method, which comprises the following parts: program receive device to receive program flow; hardware to store signal flow as MPEG flow I, P and B; frame process device to receive I, P frames; MPEG decoder for B frame and I frame.
Description
Technical field
The invention relates to individual video storing device and use its image playing method, it can easily (carry out image stream speical play (trick play) at individual video storing device in (Personal Video Recorder is to call PVR in the following text).
Background technology
Recently, wave receiving device more complicated and various product occurred gradually according to big supply and advanced trend on the ground, and at this wherein, that just released recently is exactly individual video video tape recorder (PVR, PersonalVideo Recorder).
PVR with picture signal record is different in the VCR of tape, is the new ideas digital VTR that information is recorded in hard disk and plays as information being recorded in the personal digital video recorder that hard disk is play.By being built in the hard disk drive of set-top box or TV fuselage,,, can record the video tape recorder of future generation of the programme signal of certain hour according to capacity not having under the situation of VCR.
If PVR selects channel, automatically the signal that will play now with digital store to hard disk, and play, thus, press the words that stop key is pressed play button again, the point that will stop from the programme signal of storage begins to play once more, in addition, the slow motion broadcast also can be watched or carry out to the program of playing once more now, also can skip for dull program, also can find the part of oneself wishing, and conveniently edit.
That is, the individual video record device provides basic recording function, also provides simultaneously speical play such as fast-forward play function, reverse-play function, hold function and according to the additional functions of other requirement of user.
During traditional this digital program is play, the method of compressed image is, with MPEG is the mode that the basis utilizes the dependency relation between picture to compress, so it is just relatively more difficult to play the frame that will play independently, the multiple function support of PVR is got up also relatively more difficult.
That is, in PVR in the past, during for the speical play storage flow of playing image stream, extract the corresponding index of stream, be stored as the form of index file.
Above can store multiple information in the said index file, store the address information of the medium of I frame storage in particular for speical play.
Afterwards, upload the image stream of from medium, storing, the index information of storing when utilizing speical play, stream is handled with times speed of request in the position of searching the I frame of image stream.
At this moment, identical during the speical play of low power speed with normal broadcast situation, after all frames are decoded, elongated for the time that each image shows.
But, when playing the speical play of low power speed, only utilize and common I frame or the identical locating frame of P frame, if utilize the B frame,, need very long decode time for playing the speical play of high power speed.
Identical therewith, only carry out speical play by location (anchor) frame, the doubly fast locating frame of only decoding according to request though the time of decoding shortens, can't carry out correct speical play.
Summary of the invention
The objective of the invention is in order to solve above-mentioned prior art problems, a kind of individual video storing device and image playing method thereof are provided, when image stream that the present invention stores in individual video storing device and trick-play request are together uploaded, the P frame is converted to the I frame, can easily carries out the speical play of image stream.
To achieve these goals, comprise as lower device according to its formation of individual video storing device of the present invention: the performance receiving apparatus of program receiving stream; Programme signal stream is stored as I, the P of mpeg stream, the hard disk of B frame; In the mpeg stream of storage hard disk, when carrying out speical play (trick play), receive the I, the P frame that transmit, with the top said P frame decoding frame processing apparatus that is the I frame; The mpeg decoder of the I frame that B frame that decoding transmits from hard disk and frame processing apparatus are handled.
Also include: when the program stream that receives in the top said performance receiving apparatus is analog signal, the mpeg encoder of coding simulation image.
Here, said frame processing apparatus comprises above: the frame decoding device of decoding P frame and I frame; The frame memory of each frame that storage is decoded above; The P frame that reads in frame memory is converted to the transducer of I frame.
Above said speical play be meant, for programme signal stream, normal play, return broadcast, fast-forward play, put slowly, contraryly put, picture still, only play the play mode of selecting in the part at least more than one.
In addition, for reaching top purpose, the image playing method of foundation individual video storing device of the present invention comprises the steps: first step: the program receiving information flow; Second step: I, the P, the B frame that program stream are converted to mpeg stream; Third step: judge whether ask about the speical play of program stream; The 4th step: when not having trick-play request, decoding mpeg stream and output when the request speical play, are sent to frame processing apparatus; The 5th step: in frame processing apparatus, receive I, P frame, the P frame is converted to the I frame; The 6th step: I frame of changing above and B frame are play the speical play for request.
During trick-play request, the B frame passes (by-pass) frame processing apparatus.
In the program receiving signals step, also comprise this step: when programme signal is analog signal, be encoded to mpeg format.
, in frame processing apparatus, receive the I, the P frame that from mpeg stream, transmit here, the P frame is converted to the I frame, in this step, be characterized in, change behind I, the P frame decoding.
Above said trick-play request be for program stream, normal play, return broadcast, fast-forward play, put slowly, contraryly put, picture still, only play the play mode of selecting at least more than one formation in the part.
Effect of the present invention:
Individual video storing device of the present invention and image playing method thereof have following effect, when image stream of storing in individual video storing device and trick-play request are together uploaded, the P frame is converted to the I frame, mpeg decoder random access B frame easily can be made, and then speical play can be realized with comparalive ease.
According to the doubly speed of request, only necessary location (anchor) frame of decoding so saved the time, can more effectively be carried out speical play.
For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
Description of drawings
Fig. 1 is the schematic diagram of utilizing according to the speical play method of individual video storing device of the present invention;
Fig. 2 is the schematic diagram that utilizes the speical play method of individual video storing device of the present invention;
Fig. 3 is according to the method flow diagram of playing speical play in the individual video storing device of the present invention.
Accompanying drawing major part symbol description
110: digital program signal receiving system 120,220: hard disk
130,230: locating frame decoder 133,233: frame memory
135,235: transducer 140,240:MPEG decoder
150,250: display 210: the simulated programmer signal receiving system
Embodiment
Specific embodiment to individual video storing device of the present invention and image playing method thereof is elaborated below with reference to accompanying drawings.
Digital program signal is for reaching the image quality of high definition, with image compression is MPEG (Moving PictureExperts Group), not with all frame compressions in MPEG, but utilize the many characteristics of similarity of closing between the frame to operate compensation, and this is predicted and revisal.
In the mpeg stream, only should insert with self information with regard to recoverable frame this frame boil down to rest image on the rule.
The frame of boil down to rest image is the I frame, and only the frame of prediction is the P frame, and the frame that carries out revisal is the B frame.
Above said I frame (Intra-coded frame) can occur in any position of data flow, for the visit arbitrary data use, under the situation that does not have other image reference, finish compression in real time.
Above said P frame (Predictive-coded frame) in coding and when decoding, I frame information before using and former P frame information.
That is, when mobile in the picture appearance of object self do not have big variation to move to the next door, former picture and present picture difference are very little, only values of disparity are encoded.
Above said B frame (Bidirectional-coded frame) in coding and when decoding, before using, and later I frame and P frame.
Above said B frame have I after former I or P frame and the B frame or any values of disparity of P frame.
Fig. 1 is the schematic diagram that uses the speical play implementation method of individual video storing device according to the present invention.
Same as shown in Figure 1, comprise according to its formation of individual video storing device PVR of the present invention: digital program receiving system 110; Hard disk 120; Locating frame decoder 130; Transducer 135; Frame memory 133; Mpeg decoder 140 and display unit.
Above said digital program receiving system 110 receive the data programs signals.
Above said hard disk 120 digital program signal that receives is stored as mpeg stream.
Above said locating frame decoder 130 decoding I frame and P frames.
Here, the decoding of I frame is used for the P frame decoding, and the decoding of each P frame is to be used for other P frame that should decode with reference to this P frame.
Above said frame memory 133 be in the store location frame decoder 130 decoding each image.
Above said transducer 135 read from the P frame of frame memory 133 decoding, and be encoded to new I frame.
Above said mpeg decoder 140 satisfy the MPEG specification, decoding I, B, P frame.
Above said display equipment 150 show in the mpeg decode apparatus 140 mpeg stream of decoding to the user.
Fig. 2 is the schematic diagram that utilizes according to the speical play implementation method of individual video storing device of the present invention.
Here, individual video storing device receives simulated programmer signal in analog program receiving system 210, and the simulated programmer signal of reception is encoded to mpeg stream in mpeg encoder 215.
Identical with the above, be encoded to mpeg stream, and be stored to hard disk 220, same as shown in Figure 1, the explanation of same inscape is just no longer carried out.
Below, the process of handling stream in the individual video storing device identical with last formation is illustrated.
Fig. 3 is according to the method flow diagram of playing speical play in the individual video storing device of the present invention.
S110 at first, receives digital program or simulated programmer signal S100, and image stream is stored to hard disk.
Here, image stream satisfies the MPEG specification, before mpeg stream is stored to hard disk, through making the index file step, the address information of each locating frame of storage in the indexed file.
During normal play, the stream that reads from hard disk carries out mpeg decode, is shown to the user in PVR.
S120 simultaneously, when showing the speical play situation in PVR, when the last current-carrying that reads from hard disk is the situation of B frame, shunts (bypsaa) without locating frame decoder and transducer.
The last current-carrying that reads from hard disk is sent to the locating frame decoder during for the locating frame identical with the P frame with the I frame, and each locating frame of decoding is stored to frame memory.
S130, at this moment, transducer reads from the locating frame of frame memory decoding, and each P frame is converted to the I frame.
S140, S150, identical therewith, the stream of changing for speical play is the IB stream that includes I frame and B frame, decode, according to the doubly speed of request, the frame of the relevant position of decoding, and output shows.
For example, the stream GOP of storage (Group Of Picture) is configured to: I1, B1, B2, P1, B3, B4, P2, B5, B6, P3, B7, B8, P4, B9, B10, P5, B11, B12.
If so, above said GOP carry out certain processing by locating frame decoder and controller, output mpeg decoder data flow be: I1, B1, B2, I2, B3, B4, I3, B5, B6, I4, B7, B8, I5, B9, B10, I6, B11, B12.
Simultaneously, if 10 times of speed requests during speical play, mpeg decoder decoding I1, I4, B7, I5 shows I1 and B7 frame.
Promptly, the present invention is, the data flow and the trick-play request that are stored in recording medium are together uploaded when showing, if there is trick-play request that the inscape that the data flow P frame of uploading is converted to the I frame is appended to the mpeg decoder front end, the frame of actual reception is I frame and B frame when uploading for the speical play decoder.
Identical therewith, from data flow during the specific B frame of mpeg decoder decoding, the I frame of each two chapter of front and back that decoding and B frame are nearest gets final product, so just can visit the B frame randomly.
In addition, mpeg decode Lu is for the specific frame of decoding, even all locating frames of not decoding are also passable, so saved the time greatly.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the modification of the above embodiment.
Claims (9)
1, a kind of individual video storing device is characterized in that comprising as lower device:
The performance receiving apparatus of program receiving stream;
Programme signal stream is stored as I, the P of mpeg stream, the hard disk of B frame;
In the mpeg stream of storage hard disk, when carrying out speical play, receive the I, the P frame that transmit, with the top said P frame decoding frame processing apparatus that is the I frame;
The mpeg decoder of the I frame that B frame that decoding transmits from hard disk and frame processing apparatus are handled.
2, individual video storing device as claimed in claim 1 is characterized in that:
When the program stream that receives in the described performance receiving apparatus is analog signal, the mpeg encoder of coding simulation image.
3, individual video storing device according to claim 1 is characterized in that:
Described frame processing apparatus comprises:
The frame decoding device of decoding P frame and I frame;
Store the frame memory of each frame of described decoding;
The P frame that reads in described frame memory is converted to the transducer of I frame.
4, individual video storing device according to claim 1 is characterized in that:
Described speical play is meant, for programme signal stream, normal play, returns broadcast, fast-forward play, puts slowly, contraryly puts, picture still, only plays the play mode of selecting in the part at least more than one.
5, a kind of image playing method of individual video storing device is characterized in that comprising the steps:
First step: program receiving information flow;
Second step: I, the P, the B frame that program stream are converted to mpeg stream;
Third step: judge whether ask about the speical play of program stream;
The 4th step: when not having trick-play request, decoding mpeg stream and output when the request speical play, are sent to frame processing apparatus;
The 5th step: in frame processing apparatus, receive I, P frame, the P frame is converted to the I frame;
The 6th step: I frame of changing above and B frame are play the speical play for request.
6, the video broadcasting method of personal storage device as claimed in claim 5 is characterized in that:
During described trick-play request, the B frame passes frame processing apparatus.
7, the video broadcasting method of personal storage device as claimed in claim 5 is characterized in that:
In described program receiving signals step, also comprise this step: when programme signal is analog signal, be encoded to mpeg format.
8, the video broadcasting method of personal storage device as claimed in claim 5 is characterized in that:
In described frame processing apparatus, receive the I, the P frame that from mpeg stream, transmit, the P frame is converted to the I frame, change behind I, the P frame decoding.
9, the video broadcasting method of personal storage device as claimed in claim 5 is characterized in that:
Described trick-play request is for program stream, normal play, returns broadcast, fast-forward play, puts slowly, contraryly puts, picture still, only plays the play mode of selecting at least more than one formation in the part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510029357 CN1925596A (en) | 2005-09-02 | 2005-09-02 | Individual video storing device and its image playing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510029357 CN1925596A (en) | 2005-09-02 | 2005-09-02 | Individual video storing device and its image playing method |
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| CN1925596A true CN1925596A (en) | 2007-03-07 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101478681A (en) * | 2008-12-31 | 2009-07-08 | 深圳市同洲电子股份有限公司 | Generation method, system and multimedia device for fast forwarding and rewinding video file |
| CN101686358B (en) * | 2008-09-28 | 2012-07-04 | 华为技术有限公司 | Video recording method, device and system |
| CN101521782B (en) * | 2008-12-30 | 2014-06-18 | 深圳市同洲电子股份有限公司 | Method for fast-forward and fast-backward browsing video, system and multimedia equipment |
| CN104661046A (en) * | 2013-11-25 | 2015-05-27 | 乐视网信息技术（北京）股份有限公司 | Decoding method and device of media stream |
| CN112073737A (en) * | 2019-06-11 | 2020-12-11 | 辉达公司 | Re-encoding predicted image frames in live video streaming applications |
-
2005
- 2005-09-02 CN CN 200510029357 patent/CN1925596A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101686358B (en) * | 2008-09-28 | 2012-07-04 | 华为技术有限公司 | Video recording method, device and system |
| CN101521782B (en) * | 2008-12-30 | 2014-06-18 | 深圳市同洲电子股份有限公司 | Method for fast-forward and fast-backward browsing video, system and multimedia equipment |
| CN101478681A (en) * | 2008-12-31 | 2009-07-08 | 深圳市同洲电子股份有限公司 | Generation method, system and multimedia device for fast forwarding and rewinding video file |
| CN101478681B (en) * | 2008-12-31 | 2014-07-30 | 深圳市同洲电子股份有限公司 | Generation method, system and multimedia device for fast forwarding and rewinding video file |
| CN104661046A (en) * | 2013-11-25 | 2015-05-27 | 乐视网信息技术（北京）股份有限公司 | Decoding method and device of media stream |
| CN112073737A (en) * | 2019-06-11 | 2020-12-11 | 辉达公司 | Re-encoding predicted image frames in live video streaming applications |
| CN112073737B (en) * | 2019-06-11 | 2024-09-06 | 辉达公司 | Recoding predicted image frames in live video streaming applications |
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