CN101494747B - Method for displaying roll titles based on digital television set-top box - Google Patents
Method for displaying roll titles based on digital television set-top box Download PDFInfo
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- CN101494747B CN101494747B CN2009100141954A CN200910014195A CN101494747B CN 101494747 B CN101494747 B CN 101494747B CN 2009100141954 A CN2009100141954 A CN 2009100141954A CN 200910014195 A CN200910014195 A CN 200910014195A CN 101494747 B CN101494747 B CN 101494747B
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Abstract
The invention discloses a rolling subtitling display method based on digital TV set-top box, which realizes the rolling display of the subtitling data by changing the relative position of the picture layer display window and the picture layer display memory. Compared with the method of realizing the rolling display of the subtitling data by continuously refreshing the content of the display memory corresponding to the display window, the inventive method has advantages of smoothing subtitling rolling display and no flickering in the quick-speed subtitling rolling display. The method has basic steps: (1) storing the rolling subtitling data received by the set-top box in the subtitling data cache in the memory of the set-top box; (2) the set-top box judging whether the picture layer displaying the rolling subtitling has been established, if so, switching to step (3), otherwise, establishing a picture layer displaying the rolling subtitling; (3) the set-top box setting the location and size of the display window visual region of the rolling subtitling picture layer, initializing the display memory corresponding to the rolling subtitling picture layer, and setting a display memory region corresponding to the display window visual region; (4) the set-top box copying the subtitle data stored in the subtitling data cache in the set subtitling picture layer display memory region; (5) moving the origin coordinate point of the set display memory region to the origin coordinate point of the display window visual region, changing the position of the set display memory region relative to the display window visual region so as to realize the rolling display of the subtitling data.
Description
Technical field
The present invention relates to digital television techniques field (comprising wired, satellite, ground, mobile digital TV and IPTV etc.) and mobile multimedia technical field, relate in particular to a kind of method for displaying roll titles based on digital TV set-top box.
Background technology
Along with the development of digital television techniques, digital TV set-top box user constantly increases, and during using set-top box to play TV programme, the roll display captions are very general on video.Roll titles can be a news, also can be advertisement, and it broadcasts with the form of motion, can show a lot of contents, does not take very large space again, is that the televiewer receives one of important channel of information.At present, set-top box roll display captions mainly are to realize by the content that constantly refreshes the video memory corresponding with display window.This mode requires the speed of captions rolling can not be too fast, and captions flicker and rough situation of rolling will appear in the too fast words of rolling speed, and this mode need not stop refresh video memory, take a large amount of set-top box resources.
Summary of the invention
Purpose of the present invention is exactly that to take resource many in order to solve existing set-top box roll titles display mode, the defective of the limited aspect of rolling speed, it is convenient to propose a kind of realization, and it is few to take resource, can roll and show the method for displaying roll titles based on digital TV set-top box that does not smoothly glimmer fast.
The present invention adopts following technical scheme for achieving the above object:
A kind of method for displaying roll titles based on digital TV set-top box, it is the relative position by change figure layer display window and figure layer video memory, realizes the roll display of captions, the steps include:
(1) in the caption data buffer memory that the roll titles deposit data of set-top box being received is opened up in the set-top box internal memory;
(2) set-top box judges whether the figure layer of display scrolling captions is created, if be created, then turns to step (3), if be not created, then creates the figure layer of display scrolling captions;
(3) set-top box is provided with the position and the size of roll titles figure layer display window viewing area, the video memory of initialization roll titles figure layer correspondence, the video memory zone of setting and display window viewing area correspondence;
(4) set-top box copies the caption data of depositing in the caption data buffer memory in the captions figure layer video memory zone of setting;
(5) origin coordinates that moves the video memory zone of setting is put the origin coordinates point of display window viewing area, changes the position of the video memory zone of setting with respect to the display window viewing area, has so just realized the roll display of caption data.
In the described step (3), the position of display window viewing area and size are rolled promptly according to position, size and the roll display mode of captions or scroll-up/down is determined; With the display window viewing area to the size in the video memory zone of usefulness according to the size of captions with the roll display mode is rolled promptly or scroll-up/down is determined.
In described step (3) and the step (5), having only the data in the video memory zone within the scope of display window viewing area is visible to the user, and the data in the video memory zone outside the scope of display window viewing area are sightless to the user.
In described step (4) and the step (5), earlier caption data is copied to the temporary transient sightless video memory regional space of video memory zone outside the scope of display window viewing area of setting, and then this part temporary transient sightless video memory regional space moved to the display window viewing area, and then demonstrate caption data.
The invention has the beneficial effects as follows: captions rolling is level and smooth, and the quick rolling of captions is not glimmered, and it is few to take resource.
Description of drawings
Fig. 1 is the method for displaying roll titles flow chart based on digital TV set-top box of the present invention;
Fig. 2 is the schematic diagram that concerns between captions figure layer display window of the present invention and the video memory;
Fig. 3 is the structural representation that caption data of the present invention is deposited in the captions buffer memory;
Fig. 4 be captions of the present invention from right to left during roll display viewing area and video memory zone concern schematic diagram;
Fig. 5 be captions of the present invention from bottom to up during roll display viewing area and video memory zone concern schematic diagram.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing and embodiment.
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes a part of the present invention, and illustrated embodiment of the present invention and explanation thereof are used to explain the present invention, and improper qualification of the present invention in pairs inadequately.
As shown in Figure 1, a kind of method for displaying roll titles based on digital TV set-top box, its flow process is:
(1) the roll titles deposit data of set-top box being received is in the caption data buffer memory of opening up in the set-top box internal memory;
(2) set-top box judges whether the figure layer of display scrolling captions is created, if be created, then turns to step (3), if be not created, then creates the figure layer of display scrolling captions;
(3) set-top box is provided with the position and the size of roll titles figure layer display window viewing area, the video memory of initialization roll titles figure layer correspondence, the video memory zone of setting and display window viewing area correspondence;
(4) set-top box copies the caption data of depositing in the caption data buffer memory in the captions figure layer video memory zone of setting;
(5) origin coordinates that moves the video memory zone of setting is put the origin coordinates point of display window viewing area, changes the position of the video memory zone of setting with respect to the display window viewing area, has so just realized the roll display of caption data.
As shown in Figure 2, a kind of method for displaying roll titles based on digital TV set-top box, it requires to satisfy following relation between display window and the video memory zone: the maximum height of display window is less than the maximum height in video memory zone, and perhaps the Breadth Maximum of display window is less than the Breadth Maximum in video memory zone.The viewing area is the part of display window, the maximum height of viewing area is not more than the maximum height of display window, the Breadth Maximum of viewing area is not more than the Breadth Maximum of display window, and have only the video memory data of viewing area correspondence to show, the video memory data outside the viewing area can't show.
As shown in Figure 3, in order to realize that captions can smoothly begin to roll peaceful Slipped Clove Hitch bundle rolls, need all fill transparent data in the front and back of caption data when caption data is stored in the captions buffer memory, the size that each partially filled data took up space is big or small consistent with the display window viewing area all.
On the horizontal direction with captions from right to left roll display be example, the process of the demonstration of the relation of once viewing area and video memory zone and captions rolling is described.As shown in Figure 4, suppose that the width of captions figure layer display window is w, the width of captions figure layer video memory is that (w1＞w), the height of captions is h to w1, and the captions ordinate during roll display from right to left are y0.The concrete steps that captions rolling shows are as follows:
(a) want the position of roll display and the height of captions according to captions, setting the coordinate of ordering with respect to the display window upper left corner O viewing area is (x0, y0), highly be h, width is w, simultaneously, height according to captions, set the 2 two video memory zones in video memory zone 1 and video memory zone and deposit the caption data that will show in video memory, the height in video memory zone is the height h of captions, and width is the width w1 of whole video memory;
(b) leaving beginning position distance for the 1st time from the captions buffer memory is put in the video memory zone 1 for the data of w1*h for the position of (w1-w) * h* (1-1) obtains size, point (x1 with 1 upper left corner, video memory zone, y1) move to the upper left corner, viewing area (x0, y0) position, in the viewing area, can see that video memory zone 1 insied width is the data of w this moment, owing in the captions buffer memory, filled the transparent data of size, so the user feels not have at this moment caption data for display window viewing area size w*h;
(c) in the horizontal direction, mobile from right to left video memory, (x1+w) caption data afterwards begins to appear at the rightmost of viewing area in the video memory zone 1 like this, and constantly be moved to the left, point (x1+w1 up to 1 upper right corner, video memory zone, y1) and the point (x0+w in the upper right corner, viewing area, y0) overlap, total data in the video memory zone 1 just shows one time in the viewing area like this, if the data in the captions buffer memory all are not shown one time, then continue execution in step (d), otherwise execution in step (f);
(d) data in video memory zone 1 were shown before one time, from the captions buffer memory, leave the position of beginning for the m+1 time and copy the data of the big or small w1*h of being in video memory zone 2 apart from position for (w1-w) * h*m, after data in video memory zone 1 have been shown, point (x1 with 2 upper left corners, video memory zone, y2) move to the point (x0 in the upper left corner, viewing area, y0) position, and constantly mobile from right to left in the horizontal direction video memory, like this data in the video memory zone 2 from right to left roll display in the viewing area, point (x1+w1 up to 2 upper right corner, video memory zone, y2) and the point (x0+w in the upper right corner, viewing area, y0) overlap, total data in the video memory zone 2 is shown in the viewing area one time, if the data in the captions buffer memory all are not shown one time, then the value of m adds 2, continues execution in step (e), otherwise execution in step (f);
(e) data in video memory zone 2 were shown before one time, from the captions buffer memory, leave the position of beginning for the n+1 time and copy the data of the big or small w1*h of being in video memory zone 1 apart from position for (w1-w) * h*n, after data in video memory zone 2 have been shown, point (x1 with 1 upper left corner, video memory zone, y1) move to the point (x0 in the upper left corner, viewing area, y0) position, and constantly mobile from right to left in the horizontal direction video memory, like this data in the video memory zone 1 from right to left roll display in the viewing area, point (x1+w1 up to 1 upper right corner, video memory zone, y1) and the point in the upper right corner, viewing area overlap, total data in the video memory zone 1 is shown one time in the viewing area, if the data in the captions buffer memory all are not shown one time, then the value of n adds 2, turn to step (d) to carry out, otherwise execution in step (f);
(f) stop the position of mobile video memory, captions rolling shows and finishes.
In the described step (a), for horizontal direction roll display captions, only need the along slope coordinate y0 and the height h that set the viewing area to get final product, the width of viewing area is the width of whole display window, and lateral coordinates needn't be concerned about.
Described step (d) and (e) in, the value of m is 1,3,5,7,9 ..., the value of n is 2,4,6,8 ...
Described step (b), (d), (e) in, having only the video memory zone within the scope of viewing area is visible to the user, video memory zone outside the scope of viewing area is sightless to the user, each all is to copy the data in the captions to outside the scope of viewing area video memory zone, so just can not cause the captions flicker problem in the data copy procedure.Padding data in the captions buffer memory also belongs to valid data, in the time of at every turn from captions cached copies data to the video memory zone, all be from the different position copy of captions buffer memory, want the original position start1 of copies data to satisfy following relation: start1=start0+ (w1-w) * h* (i-1), wherein, start0 is the starting position of captions buffer memory, and w1 is the width of video memory, w is the width of viewing area, h is the height of captions, i be expression which time from captions cached copies data to the video memory zone, the value of i is 1,2,3,4,5,6 ...
Captions from left to right the method for roll display and described captions scroll display method is similar from right to left, repeat no more among the present invention.
On the vertical direction with captions from bottom to up roll display be example, the process of the demonstration of the relation of once viewing area and video memory zone and captions rolling is described.As shown in Figure 5, suppose that the height of captions figure layer display window is H, the height of captions figure layer video memory be H1 (H1＞H), the width of captions is W, captions from bottom to up during roll display the abscissa of left margin be X0.The concrete steps that captions rolling shows are as follows:
(a1) want the position of roll display and the width of captions according to captions, setting the coordinate of ordering with respect to the display window upper left corner O viewing area is (X0, Y0), highly be the height H of display window, width is the width W of captions, simultaneously, width according to captions, set the 4 two video memory zones in video memory zone 3 and video memory zone and deposit the caption data that will show in video memory, the width in video memory zone is the width W of captions, highly is the width H1 of whole video memory;
(b1) leaving beginning position distance for the 1st time from the captions buffer memory is put in the video memory zone 3 for the data of H1*W for the position of (H1-H) * W* (1-1) obtains size, point (X1 with 3 upper left corners, video memory zone, Y1) move to the upper left corner, viewing area (X0, Y0) position, in the viewing area, can see that video memory zone 3 inner heights are the data of H this moment, owing in the captions buffer memory, filled the transparent data of size, so the user feels not have at this moment caption data for display window viewing area size W*H;
(c1) in vertical direction, mobile from bottom to up video memory, (Y1+H) caption data afterwards begins to appear at the viewing area bottom in the video memory zone 3 like this, and constantly move up, point (X1 up to 3 lower left corners, video memory zone, Y1+H1) and the point (X0 in the lower left corner, viewing area, Y0+H) overlap, total data in the video memory zone 3 just shows one time in the viewing area like this, if the valid data in the captions buffer memory all are not shown one time, then continue execution in step (d1), otherwise execution in step (f1);
(d1) data in video memory zone 3 were shown before one time, from the captions buffer memory, leave the position of beginning for the M+1 time and copy the data of the big or small H1*W of being in video memory zone 4 apart from position for (H1-H) * W*M, after data in video memory zone 3 have been shown, point (X2 with 4 upper left corners, video memory zone, Y1) move to the point (X0 in the upper left corner, viewing area, Y0) position, and at the constantly mobile from bottom to top video memory of vertical direction, like this data in the video memory zone 4 from top to bottom roll display in the viewing area, point (X2 up to 4 lower left corners, video memory zone, Y1+H1) and the point (X0 in the lower left corner, viewing area, Y0+H) overlap, total data in the video memory zone 4 is shown in the viewing area one time, if the data in the captions buffer memory all are not shown one time, then the value of M adds 2, continues execution in step (e1), otherwise execution in step (f1);
(e1) data in video memory zone 4 were shown before one time, from the captions buffer memory, leave the position of beginning for the N+1 time and copy the data of the big or small H1*W of being in video memory zone 3 apart from position for (H1-H) * W*N, after data in video memory zone 4 have been shown, point (X1 with 3 upper left corners, video memory zone, Y1) move to the point (X0 in the upper left corner, viewing area, Y0) position, and at the constantly mobile from bottom to top video memory of vertical direction, like this data in the video memory zone 3 from top to bottom roll display in the viewing area, point (X1 up to 3 lower left corners, video memory zone, Y1+H1) and the point (X0 in the lower left corner, viewing area, Y0+H) overlap, total data in the video memory zone 3 is shown in the viewing area one time, if the data in the captions buffer memory all are not shown one time, then the value of N adds 2, turns to step (d1) to carry out, otherwise execution in step (f1);
(f1) stop the position of mobile video memory, captions rolling shows and finishes.
In the described step (a1), for vertical direction roll display captions, the lateral coordinates X0 and the width W that only need to set the viewing area get final product, and the height of viewing area is the width of whole display window, and along slope coordinate needn't be concerned about.
Described step (d1) and (e1) in, the value of M is 1,3,5,7,9 ..., the value of N is 2,4,6,8 ...
Described step (b1), (d1), (e1) in, having only the video memory zone within the scope of viewing area is visible to the user, video memory zone outside the scope of viewing area is sightless to the user, each all is to copy the data in the captions to outside the scope of viewing area video memory zone, so just can not cause the captions flicker problem in the data copy procedure.Padding data in the captions buffer memory also belongs to valid data, in the time of at every turn from captions cached copies data to the video memory zone, all be from the different position copy of captions buffer memory, want the original position addr of copies data to satisfy following relation: addr=start0+ (H1-H) * W* (j-1), wherein, start0 is the starting position of captions buffer memory, and H1 is the height of video memory, H is the height of viewing area, W is the width of captions, j be expression which time from captions cached copies data to the video memory zone, the value of j is 1,2,3,4,5,6 ...
Captions from top to bottom the method for roll display and described captions scroll display method is similar from bottom to up, repeat no more among the present invention.
The method of the invention and embodiment are that the method from software has illustrated how by changing the position roll display captions of video memory and display window; for by hardware chip, realize that according to the method for the invention the method that captions rolling shows also belongs to protection range of the present invention.
Claims (3)
1. the method for displaying roll titles based on digital TV set-top box is characterized in that, it is by changing the relative position in captions figure layer display window viewing area and captions figure layer video memory zone, realize the roll display of captions, the steps include:
(1) in the caption data buffer memory that the roll titles deposit data of set-top box being received is opened up in the set-top box internal memory;
(2) set-top box judges whether the figure layer of display scrolling captions is created, if be created, then turns to step (3), if be not created, then creates the figure layer of display scrolling captions;
(3) set-top box is provided with the position and the size of roll titles figure layer display window viewing area, the video memory of initialization roll titles figure layer correspondence, the captions figure layer video memory zone of setting and captions figure layer display window viewing area correspondence; The position of captions figure layer display window viewing area and size are rolled promptly according to position, size and the roll display mode of captions or scroll-up/down is determined; The size in the captions figure layer video memory zone corresponding with captions figure layer display window viewing area is according to the size of captions and the roll display mode is rolled promptly or scroll-up/down is determined;
(4) set-top box copies the caption data of depositing in the caption data buffer memory in the captions figure layer video memory zone of setting;
(5) origin coordinates that moves the captions figure layer video memory zone of setting is put the origin coordinates point of captions figure layer display window viewing area, change the position of the captions figure layer video memory zone of setting, so just realized the roll display of caption data with respect to captions figure layer display window viewing area.
2. the method for displaying roll titles based on digital TV set-top box as claimed in claim 1, it is characterized in that, in described step (3) and the step (5), having only the data in the video memory zone within the scope of captions figure layer display window viewing area is visible to the user, and the data in the video memory zone outside the scope of captions figure layer display window viewing area are sightless to the user.
3. the method for displaying roll titles based on digital TV set-top box as claimed in claim 1, it is characterized in that, in described step (4) and the step (5), earlier caption data is copied to the temporary transient sightless video memory regional space of captions figure layer video memory zone outside the scope of captions figure layer display window viewing area of setting, and then this part temporary transient sightless video memory regional space moved within the scope of captions figure layer display window viewing area, and then demonstrate caption data.
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101707055B (en) * | 2009-10-30 | 2013-01-09 | 深圳市创维软件有限公司 | Method and system for processing window images of digital television set-top box |
| CN102098446B (en) * | 2009-12-09 | 2015-05-27 | 新奥特（北京）视频技术有限公司 | Real-time data storage method and device for caption broadcasting system |
| CN102158666A (en) * | 2010-04-21 | 2011-08-17 | 青岛海信传媒网络技术有限公司 | Method and device for displaying rolling subtitles |
| CN101888508A (en) * | 2010-07-19 | 2010-11-17 | 福建新大陆通信科技股份有限公司 | Method for rolling subtitles of set-top box with low memory |
| CN102231858A (en) * | 2011-06-03 | 2011-11-02 | 深圳创维数字技术股份有限公司 | Window processing method and apparatus of digital television |
| CN102665051A (en) * | 2012-04-06 | 2012-09-12 | 安科智慧城市技术（中国）有限公司 | Embedded system based display terminal and method and system for subtitle display of display terminal |
| CN105025385B (en) * | 2015-06-26 | 2018-03-23 | 福建新大陆通信科技股份有限公司 | A kind of set top box multi-screen rolls the method and system of word |
| CN105812955B (en) * | 2016-03-15 | 2018-06-08 | 深圳市茁壮网络股份有限公司 | A kind of method for displaying roll titles and set-top box processes device |
| CN112689188B (en) * | 2020-12-21 | 2022-06-21 | 威创集团股份有限公司 | Large-screen rolling caption display method, device, terminal and storage medium |
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