CN101931808B - Method and device for reversely playing file - Google Patents
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- CN101931808B CN101931808B CN 201010239253 CN201010239253A CN101931808B CN 101931808 B CN101931808 B CN 101931808B CN 201010239253 CN201010239253 CN 201010239253 CN 201010239253 A CN201010239253 A CN 201010239253A CN 101931808 B CN101931808 B CN 101931808B
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Abstract
The invention provides a method and a device for reversely playing a file. The method comprises the following steps: when decoding a sequence set to be processed for the ith time, decoding the first n-i+2 groups of data frames in the sequence set; discarding the first n-i+1 groups of data frames; and storing the first n-i+2 groups of data frames in a memory, wherein i is a natural number orderly taken between 1 and n+1; the data frames in the memory are orderly taken for reverse playing; the sequence set comprises n+1 groups of data frames; and n is the decoding times and a natural number greater than 1. The method and the device provided by the embodiment of the invention can reduce the requirements on the memory capacity during the reverse file playing.
Description
Technical field
The embodiment of the invention relates to the video technique field, relates in particular to a kind of file backward player method and device.
Background technology
In audio-visual broadcast field, the video backward is play the content can be convenient for people to find own needs, and it is a very important link in the special play-back.In the monitoring field, the video backward is play and can be helped people to find needed video resource faster and more accurately.Along with the deep development of multimedia technology, the video backward is play has become link with light tone in people's daily life.
The method that the video backward is play in the prior art comprises: at first, decoder decode goes out all frames of a sequence sets, and Frame comprises reference frame (I frame) and non-reference frame (P frame), and decoder is decoding I frame earlier, the P frame of decoding again, decoded data send in the memory.Player fetches data from memory from last P frame, the Frame that takes out is play played the finishing of an I frame that begins most up to this sequence sets.After playing a Frame, memory discharges the space of a Frame, and decoder continues the Frame in the decoding sequence sets before.The original order of Frame is opposite in the order of frame of display data and the sequence sets, has realized that the video backward plays.
The method that this video backward is play needs earlier all frames of a sequence sets all to have been decoded to send in the buffering, is play by the player backward again.This just needs the capacity of buffering to equal set of pictures (Group of Pictures at least, be called for short GOP) totalframes, i.e. at interval totalframes between adjacent two I frames is to the capacity requirement height of memory, and the price of the high memory of capacity is very expensive, the cost up that causes the video backward to be play.
Summary of the invention
The embodiment of the invention provides a kind of file backward player method and device, in order to when realizing that the file backward is play, reduces in the file backward playing process requirement for memory span.
The embodiment of the invention provides a kind of file backward player method, comprising:
When pending sequence sets being carried out the i time decoding, the preceding n-i+2 group Frame in the described sequence sets of decoding, n-i+1 group Frame before abandoning deposits n-i+2 group Frame in the memory in, and i gets in proper order from 1 to n+1 natural number;
Wherein, the Frame in the described memory is removed, and plays for backward;
Described sequence sets comprises n+1 group Frame, and wherein, n is the decoding multiple, and is the natural number greater than 1, and the capacity of described memory is described sequence sets totalframes/n.
The embodiment of the invention also provides a kind of file backward playing device, comprising:
Decoder is used for when pending sequence sets being carried out the i time decoding, the preceding n-i+2 group Frame in the described sequence sets of decoding, and n-i+1 group Frame before abandoning deposits n-i+2 group Frame in the memory in; Wherein, described sequence sets comprises n+1 group Frame, and n is decoding multiple and for greater than 1 natural number, i gets the natural number in 1 to n+1 in proper order;
Memory is used for store frames of data, and the capacity of described memory is described sequence sets totalframes/n;
Player is used for taking out Frame from described memory, and backward is play described Frame.
As seen, in the file backward player method that the embodiment of the invention provides and the device, a sequence sets is divided into the n+1 group, when sequence sets being carried out the i time decoding, decode preceding n-i+2 group Frame in the described sequence sets, n-i+1 group Frame before abandoning, n-i+2 group Frame is deposited in the memory, wherein n is the decoding multiple, the capacity minimum of memory can be GOP/n like this, because n is the natural number greater than 1, GOP/n is GOP less than the capacity that requires memory in the GOP(prior art at least so), so compared with prior art, the requirement for memory span in the embodiment of the invention diminishes, thereby realizing file (video for example, when files such as audio frequency) backward is play, reduce in the file backward playing process requirement for memory span.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do one to the accompanying drawing of required use in embodiment or the description of the Prior Art below introduces simply, apparently, accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Figure 1 shows that the schematic flow sheet of file backward player method embodiment of the present invention;
Fig. 2 a-2e is depicted as the logical schematic that decoder in the embodiment of the invention deposits Frame in memory;
Figure 3 shows that the schematic flow sheet of decoder stores Frame in the embodiment of the invention;
Figure 4 shows that the structural representation of a kind of file backward playing device of the embodiment of the invention;
Figure 5 shows that the structural representation of the another kind of file backward playing device of the embodiment of the invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
The file backward player method that the embodiment of the invention provides comprises: when pending sequence sets being carried out the i time decoding, the preceding n-i+2 group Frame that decoding sequence is concentrated, n-i+1 group Frame before abandoning deposits n-i+2 group Frame in the memory in, and i gets in proper order from 1 to n+1 natural number; Wherein, the Frame in the memory is removed, and plays for backward; Described pending sequence sets comprises n+1 group Frame, and wherein, n is decoding multiple and for greater than 1 natural number.
Need to prove that in the various embodiments of the present invention, file can comprise files such as video, audio frequency.The implementation procedure of file backward player method of the present invention is described with specific embodiment below.
Be illustrated in figure 1 as the schematic flow sheet of file backward player method embodiment of the present invention, file data comprises a series of according to certain tactic sequence sets, has just chosen wherein two sequence sets A and B among Fig. 1.The structure of sequence sets A and B is identical, includes 12 Frames, and the numbering of the Frame among the hypothetical sequence collection A is respectively #0, #1, #2, #3, #4, #5, #6, #7, #8, #9, #10 and #11, and the #0 Frame is the I frame, and remaining Frame is the P frame.The numbering of the Frame among the sequence sets B is respectively #12, #13, #14, #15, #16, #17, #18, #19, #20, #21, #22 and #23, first Frame of the adjacent next sequence sets among Fig. 1 after the #24 Frame time series collection B.Among the sequence sets B, the #12 Frame is the I frame.
Among Fig. 1, GOP is 12, and the hypothesis decoding multiple equals 2, and the decoding multiple is the ratio of the demonstration speed of the decode rate of decoder and player.So, the capacity minimum of memory can be GOP/n=12/2=6.
Because sequence sets B is after A, when the file backward was play, decoder needed the Frame among the first decoding sequence collection B.Each Frame among the sequence sets B is divided into 3 groups, and #12 number is the 1st group to the #15 Frame, and #16 number to #19 number is the 2nd group, and #20 number to #23 number is the 3rd group.In this case, be equivalent to n+1=3, just need altogether to decode 3 times.
In step 101, for sequence sets B, decoder carries out the 1st decoding (being i=1) since the #12 Frame, n-i+2=2-1+2=3 group Frame before the decoding abandons preceding n-i+1=2-1+1=2 group Frame, namely, the 1st group and the 2nd group of Frame are abandoned, n-i+2=2-1+2=3 group Frame is deposited in the memory, that is, #20 number is deposited in the memory to the #23 Frame.In decoder decode, display can take out #20 number to the #23 Frame from memory, and backward is play, and the order that is to say broadcast is #23 Frame, #22 Frame, #21 Frame, #20 Frame.
In step 102, decoder carries out the 2nd decoding (being i=2) since the #12 Frame, n-i+2=2-2+2=2 group Frame before the decoding, preceding n-i+1=2-2+1=1 group Frame is abandoned, that is, the 1st group of Frame abandoned, n-i+2=2-2+2=2 group Frame is deposited in the memory, that is, #16 number is deposited in the memory to the #19 Frame.In decoder decode, display can take out #16 number to the #19 Frame from memory, and backward is play, and the order that is to say broadcast is #19 Frame, #18 Frame, #17 Frame, #16 Frame.
In step 103, decoder carries out the 3rd decoding (being i=3) since the #12 Frame, n-i+2=2-3+2=1 group Frame before the decoding, preceding n-i+1=2-3+1=0 group Frame is abandoned, that is, do not need to abandon Frame, n-i+2=2-3+2=1 group Frame is deposited in the memory, that is, #12 number is deposited in the memory to the #15 Frame.In decoder decode, player can take out #12 number to the #15 Frame from memory, and backward is play, and the order that is to say broadcast is #15 Frame, #14 Frame, #13 Frame, #12 Frame.
Finish after the step 103, just finished the backward of sequence sets B and play, next decoder can continue decoding sequence collection A according to the method identical with decoding sequence collection B, finishes the backward of sequence sets A and plays.
The decoder decode Frame is finished frame by frame, and decoder can take full advantage of the clear area of memory, deposits the up-to-date clear area that discharges of memory in decoding Frame.
Particularly, decoder deposits n-i+2 group Frame in the memory in, can comprise: the Frame that comes out decoding in the n-i+2 group Frame deposits the clear area of memory in.
Be depicted as decoder in the embodiment of the invention as Fig. 2 a-2e and deposit Frame the logical schematic of memory in, be illustrated in figure 3 as the schematic flow sheet of decoder stores Frame in the embodiment of the invention.Below in conjunction with the concrete storing process of Fig. 2 a-2e explanation.
Selected a sequence sets B among Fig. 2 a-2e, hypothesis decoding multiple n=2, GOP are that 12,12 Frames are divided into 3 groups of decoder decodes n+1=3 time.
In step 201, decoder has carried out the 1st decoding, and preceding 2 groups of Frames are abandoned, the 3rd group of Frame deposited in the clear area of memory C (at this moment memory do not have occupied, so whole memory all is the clear area), referring to Fig. 2 a.Owing to when decoding at the beginning, also do not have Frame in the memory, so GOP/ (n+1)=12/ (2+1)=4 Frame in the 3rd group can deposit in the memory together.The capacity minimum of memory can be GOP/n=12/2=6.
In decoder decode, player takes out Frame simultaneously and shows from memory.Player can take out and play to the #20 Frame # 23 number successively.The order of playing is opposite with the ordering of Frame.
In step 202, in player plays #21 Frame, decoder is just in time decoded #16 number and the #17 Frame (because decode rate is to show 2 times of speed, so show two frames of to decode in time of a frame, when showing the #23 Frame, decoder decode has gone out #12 number and the #13 Frame, and this two frame has been dropped.When showing the #24 Frame, decoder decode has gone out #14 number and the #15 Frame, this two frame also has been dropped), #16 number of will decode of decoder and #17 frame data deposit in the memory among the up-to-date space F1 that discharges, shown in Fig. 2 b, this space F1 plays and reserves owing to the played device of #22 number and #23 Frame.
In step 203, in player plays #20 Frame, decoder is just in time decoded #18 number and the #19 Frame, and decoder deposits the Frame that decodes among the space F2 in the memory, shown in Fig. 2 c in.
In step 204, decoder carries out the 2nd decoding, deposits # 12 number and #13 Frame in space F3 simultaneously, shown in Fig. 2 d, space F3 since #20 number and #21 Frame be played the device broadcast and reserve.Player shows the #19 Frame simultaneously.
In step 205, in the time of decoder decode # 14 number and #15 Frame, player has shown the #18 Frame, decoder deposits # 14 number and #15 Frame in space F4, shown in Fig. 2 e, space F4 plays and reserves owing to the played device of #18 number and #19 Frame.
After the execution of step 205, decoder continues the last sequence sets of decoding, adopts similar method to deposit Frame in memory.The last sequence sets of having decoded needs the regular hour, and in this time, the Frame in the memory can show, thereby reserve the clear area.After decoder will store in the memory, can record the position of each Frame in memory.Player takes out Frame, with played in order each Frame opposite with the numbering of Frame according to the position of each Frame in described memory of record.Thereby reach the purpose that backward is play.
The storage means of employing shown in above-mentioned embodiment, the Frame that decodes is put into clear area in the memory, and the clear area is to be discharged by the Frame of having play, on one side so just can decode, play on one side, and effectively utilize the space of memory.
If video playout speed continue to increase, for example video playout speed be aforementioned each embodiment broadcasting speed Nx doubly, the capacity minimum of memory can equal (Nx*GOP/n) so, also can adopt the preceding method backward to play in this case
As seen, in the file backward player method that the embodiment of the invention provides, a sequence sets is divided into the n+1 group, when decoder carries out the i time decoding to sequence sets, decode preceding n-i+2 group Frame in the described sequence sets, n-i+1 group Frame before abandoning, n-i+2 group Frame is deposited in the memory, wherein n is the decoding multiple, the capacity minimum of memory can be GOP/n like this, because n is the natural number greater than 1, GOP/n is less than GOP so, so compared with prior art (minimum capacity that requires memory in the prior art is GOP), the requirement for memory span in the embodiment of the invention diminishes, and the price of the little memory of capacity is lower, thereby can reduce cost.
And, along with developing by leaps and bounds of video compression technology, be that the high video compression technology of representative occupies main flow with MPEG4, H264, video data after these compressions is formed by reference frame (I frame) and non-reference frame (P frame), the embodiment of the invention is under the situation of existing main flow H264, MPEG4 code stream form, realized the file mechanism of putting upside down, to such an extent as to and avoided the file memory consumption of putting upside down too much to be not suitable for the problem of engineering practical application.
Be illustrated in figure 4 as the structural representation of a kind of file backward playing device of the embodiment of the invention, this device comprises decoder 11, memory 12 and player 13.Wherein:
Under a kind of implementation, decoder 11 can comprise decoding unit 111 and storage control unit 112, wherein:
Under a kind of implementation, device as shown in Figure 4 can also comprise logging modle 14, and this logging modle 14 is connected with storage control unit 112, is used for each Frame of record in the position of memory.
Among Fig. 4, player 13 can comprise Frame acquiring unit 131 and broadcast unit 132, wherein:
Device as shown in Figure 4, the process that the process of decoder decode and broadcast unit are play can be referring to the description of preceding method embodiment part.
Need to prove that in the various embodiments of the present invention, file can comprise files such as video, audio frequency.
As seen, in the file backward playing device that the embodiment of the invention provides, a sequence sets is divided into the n+1 group, when sequence sets being carried out the i time decoding, decode preceding n-i+2 group Frame in the described sequence sets, n-i+1 group Frame before abandoning, n-i+2 group Frame is deposited in the memory, wherein n is the decoding multiple, the capacity minimum of memory can be GOP/n like this, because n is the natural number greater than 1, GOP/n is less than GOP (capacity that requires memory in the prior art is GOP at least) so, so compared with prior art, the requirement for memory span in the embodiment of the invention diminishes, thereby realizing file (video for example, when files such as audio frequency) backward is play, reduce in the file backward playing process requirement for memory span.And the price of the little memory of capacity is lower, thereby can reduce cost.
And, along with developing by leaps and bounds of video compression technology, be that the high video compression technology of representative occupies main flow with MPEG4, H264, video data after these compressions is formed by reference frame (I frame) and non-reference frame (P frame), the embodiment of the invention is under the situation of existing main flow H264, MPEG4 code stream form, realized the file mechanism of putting upside down, to such an extent as to and avoided the file memory consumption of putting upside down too much to be not suitable for the problem of engineering practical application.
Be illustrated in figure 5 as the structural representation of the another kind of file backward playing device of the embodiment of the invention, this device also comprises decoding timer 15 and plays timer 16, decoding timer 15 is connected with decoder 11, decoder 11 is under the driving of decoding timer 15, read the Frame of file with fixing rhythm, elder generation's decoding reference frame, the non-reference frame of decoding again and following later, and the Frame that generates of will decoding is sent into memory 12.Play timer 16 and be connected with player 13, player 13 is got decoded Frame with fixing rhythm and is shown under the driving of broadcast timer 16 from memory 12.
Embodiment shown in Fig. 5, also can comprise logging modle, among the embodiment shown in Figure 5, decoder 11 and player 13 also can adopt structure as shown in Figure 4, concrete function is described and can be repeated no more here with reference to a kind of file backward playing device of the embodiment of the invention shown in Figure 4.
As seen, in the file backward playing device that the embodiment of the invention provides, a sequence sets is divided into the n+1 group, when sequence sets being carried out the i time decoding, decode preceding n-i+2 group Frame in the described sequence sets, n-i+1 group Frame before abandoning, n-i+2 group Frame is deposited in the memory, wherein n is the decoding multiple, the capacity minimum of memory can be GOP/n like this, because n is the natural number greater than 1, GOP/n is less than GOP (capacity that requires memory in the prior art is GOP at least) so, so compared with prior art, the requirement for memory span in the embodiment of the invention diminishes, thereby realizing file (video for example, when files such as audio frequency) backward is play, reduce in the file backward playing process requirement for memory span.And the price of the little memory of capacity is lower, thereby can reduce cost.
And, along with developing by leaps and bounds of video compression technology, be that the high video compression technology of representative occupies main flow with MPEG4, H264, video data after these compressions is formed by reference frame (I frame) and non-reference frame (P frame), the embodiment of the invention is under the situation of existing main flow H264, MPEG4 code stream form, realized the file mechanism of putting upside down, to such an extent as to and avoided the file memory consumption of putting upside down too much to be not suitable for the problem of engineering practical application.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (8)
1. a video file backward player method is characterized in that, comprising:
When pending sequence sets being carried out the i time decoding, the preceding n-i+2 group Frame in the described sequence sets of decoding, n-i+1 group Frame before abandoning deposits n-i+2 group Frame in the memory in, and i gets in proper order from 1 to n+1 natural number;
Wherein, the Frame in the described memory is removed, and plays for backward;
Described sequence sets comprises n+1 group Frame, and wherein, n is the decoding multiple, and is the natural number greater than 1, and the capacity of described memory is described sequence sets totalframes/n.
2. method according to claim 1 is characterized in that, n-i+2 group Frame is deposited in the memory, comprising:
The Frame that comes out decoding in the n-i+2 group Frame deposits the clear area of described memory in.
3. method according to claim 1 and 2 is characterized in that, also comprises: record the position of each Frame in described memory.
4. method according to claim 3 is characterized in that, the Frame in the described memory is removed, and plays for backward, comprising:
According to the position of each Frame in described memory of record, take out described Frame, with played in order each Frame opposite with the numbering of described Frame.
5. a video file backward playing device is characterized in that, comprising:
Decoder is used for when pending sequence sets being carried out the i time decoding, the preceding n-i+2 group Frame in the described sequence sets of decoding, and n-i+1 group Frame before abandoning deposits n-i+2 group Frame in the memory in; Wherein, described sequence sets comprises n+1 group Frame, and n is decoding multiple and for greater than 1 natural number, i gets the natural number in 1 to n+1 in proper order;
Memory is used for store frames of data, and the capacity of described memory is described sequence sets totalframes/n;
Player is used for taking out Frame from described memory, and backward is play described Frame.
6. device according to claim 5 is characterized in that, described decoder comprises:
Decoding unit is used for when described sequence sets being carried out the i time decoding, the preceding n-i+2 group Frame in the described sequence sets of decoding, n-i+1 group Frame before abandoning;
Storage control unit, the Frame that comes out for n-i+2 group Frame is decoded deposits the clear area of described memory in.
7. device according to claim 6 is characterized in that, further comprises logging modle, is used for each Frame of record in the memory location of described memory.
8. device according to claim 7 is characterized in that, described player comprises:
Frame acquiring unit, each Frame that is used for recording according to described logging modle take out corresponding Frame in the memory location of described memory from described memory;
Broadcast unit, each Frame that is used for described Frame acquiring unit is obtained is with the played in order opposite with the numbering of described Frame.
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| CN105227884A (en) * | 2014-07-03 | 2016-01-06 | 深圳中兴力维技术有限公司 | Realize method that video file puts upside down and device thereof |
| CN107222779B (en) * | 2017-06-08 | 2019-11-19 | 浙江大华技术股份有限公司 | A kind of method and device of video play-reverse |
| CN109819317A (en) * | 2019-01-07 | 2019-05-28 | 北京奇艺世纪科技有限公司 | A kind of method for processing video frequency, device, terminal and storage medium |
| CN111866574A (en) * | 2019-04-29 | 2020-10-30 | 浙江开奇科技有限公司 | Real-time reverse playing method for mobile end streaming media |
| CN112019856A (en) * | 2020-08-27 | 2020-12-01 | 上海七牛信息技术有限公司 | Video reversing method and system for smart phone |
| CN113542856B (en) * | 2021-06-28 | 2023-06-13 | 宜宾中星技术智能系统有限公司 | Method, device, equipment and computer readable medium for reverse playing of online video |
| CN113923456B (en) * | 2021-09-30 | 2022-12-13 | 稿定（厦门）科技有限公司 | Video processing method and device |
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| JP2007336069A (en) * | 2006-06-13 | 2007-12-27 | Sony Corp | Information processor and processing method, program, and recording medium |
| CN100574405C (en) * | 2003-01-08 | 2009-12-23 | 三星电子株式会社 | The method and apparatus that is used for reverse-play |
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| JP4322944B2 (en) * | 2007-10-31 | 2009-09-02 | 株式会社東芝 | VIDEO REPRODUCTION DEVICE, VIDEO REPRODUCTION METHOD, AND VIDEO REPRODUCTION PROCESSING PROGRAM |
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| CN100574405C (en) * | 2003-01-08 | 2009-12-23 | 三星电子株式会社 | The method and apparatus that is used for reverse-play |
| JP2007336069A (en) * | 2006-06-13 | 2007-12-27 | Sony Corp | Information processor and processing method, program, and recording medium |
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