CN102665051A - Embedded system based display terminal and method and system for subtitle display of display terminal - Google Patents
Embedded system based display terminal and method and system for subtitle display of display terminal Download PDFInfo
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- CN102665051A CN102665051A CN2012100995788A CN201210099578A CN102665051A CN 102665051 A CN102665051 A CN 102665051A CN 2012100995788 A CN2012100995788 A CN 2012100995788A CN 201210099578 A CN201210099578 A CN 201210099578A CN 102665051 A CN102665051 A CN 102665051A
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Abstract
The invention belongs to the display technical field, and provides an embedded system based display terminal and a method and a system for subtitle display of the display terminal. The method includes: receiving subtitle special effect display signals; subjecting prestored current to-be-displayed subtitle content to special effect processing according to preset subtitle attribute information and special effect display modes corresponding to the subtitle special effect display signals, and reading the current to-be-displayed subtitle content into display memory of the embedded system based display terminal according to processing results; and displaying the current to-be-displayed subtitle content read into the display memory on a display interface according to corresponding the special effect display modes of the preset subtitle special effect display signals. By the method for subtitle display of the embedded system based display terminal, special effect display can be realized while the current to-be-displayed subtitle content can be displayed at any position of the display interface through the preset subtitle attribute information corresponding to the subtitle special effect display signals, so that display effects are enriched, and ornamental performance is improved.
Description
Technical field
The invention belongs to the Display Technique field, relate in particular to a kind of playback terminal and caption presentation method thereof, system based on embedded system.
Background technology
At present, the roll titles technology has been widely used in the various video broadcastings terminal.For example, utilize the roll titles technology can in the video broadcasting terminal, realize rolling Broadcast Journalism, rolling commercial breaks etc.In carrying out the roll display process; The caption content current to be shown that shows flows through continuous renewal with certain rolling speed, screen from the video broadcasting terminal in the rolling time scope; With respect to static display mode, captions rolling shows more flexible, and effect is various; Have good ornamental, can make spectators obtain better visual experience.
Development along with demand; Be not only at the video broadcasting terminal, also need the display scrolling captions at some other playback terminal, as: video monitoring terminal, video intercom terminal etc.; No matter be applied to which kind of terminal, all there is certain deficiency in existing nowadays most of caption presentation methods.The existing generally method through the static state stack shows captions, that is to say, is superimposed upon through the caption information with single file or multirow on the screen of playback terminal and realizes the captions demonstration, and its display effect is single, appreciative value is poor.And for the conventional dynamic display packing; It is to realize that through the mode of constantly captions to be shown are wiped and be drawn into again to video memory captions dynamically show, plays though can realize the rolling of captions, and its rolling special efficacy is single; And need wipe OSD when redrawing owing to captions; Prolong the time of describing captions greatly, caused captions when rolling, scintillation to occur, had a strong impact on display effect.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of caption presentation method of the playback terminal based on embedded system; The caption presentation method that is intended to solve the playback terminal that prior art provides adopts the mode of static stack to show captions, and its display effect is single, the problem of appreciative value difference.
The embodiment of the invention is achieved in that a kind of caption presentation method of the playback terminal based on embedded system, said method comprising the steps of:
Receive captions special efficacy shows signal;
According to preset pairing captions attribute information of said captions special efficacy shows signal and special efficacy display mode; Caption content current to be shown to prestoring is carried out special effect processing, and reads in the video memory based on the playback terminal of embedded system according to the said current caption content to be shown that result will prestore;
With the preset pairing special efficacy display mode of said captions special efficacy shows signal, show the caption content current to be shown of reading in said video memory at display interface.
In the caption presentation method of above-mentioned playback terminal based on embedded system, said captions attribute information can comprise: the original position abscissa of captions viewing area on video memory, original position ordinate, the width of captions viewing area, the height of captions viewing area; And the initial abscissa of the said current caption content to be shown that prestores in the memory block, the initial ordinate of said current caption content to be shown in the memory block that prestores; With initial abscissa, said current to be shown caption content the initial ordinate in video memory of said current caption content to be shown in video memory.
Further; The reference axis of supposing said display interface is positive direction to the right; If said special efficacy display mode is a scroll display mode from right to left; Then said the caption content current to be shown that prestores is carried out special effect processing, and the step of reading in based on the video memory of the playback terminal of embedded system according to the said current caption content to be shown that result will prestore can may further comprise the steps again:
When the initial abscissa of said current caption content to be shown in video memory during greater than the original position abscissa of said captions viewing area on video memory; Calculate the abscissa of character to be shown in video memory in the said current caption content to be shown, the character to be pasted of respective widths is attached to the relevant position of said video memory in the said current caption content to be shown that will prestore afterwards;
When the initial abscissa of said current caption content to be shown in video memory is less than or equal to the original position abscissa of said captions viewing area on video memory; Calculate the captions length that current demonstration caption content is eaten by captions viewing area left hand edge, and the initial abscissa of said current caption content to be shown in video memory navigated to the original position abscissa of said captions viewing area on video memory; According to the captions length that calculates, calculate the initial abscissa of current caption content to be shown in the memory block afterwards; Begin from the initial abscissa of said current caption content to be shown the memory block afterwards, the character to be pasted of respective widths is attached to the relevant position of said video memory;
When the afterbody of said current caption content to be shown is rolled to the right hand edge of said captions viewing area, the initial abscissa of said current caption content to be shown in video memory navigated to the right hand edge of said captions viewing area.
If said special efficacy display mode is a scroll display mode from left to right; Then said the caption content current to be shown that prestores is carried out special effect processing, and the step of reading in based on the video memory of the playback terminal of embedded system according to the said current caption content to be shown that result will prestore can may further comprise the steps again:
When the initial abscissa of said current caption content to be shown in the memory block greater than the width of said captions viewing area and said memory block in during the difference of caption content effective width; Calculate the abscissa of bebinning character to be shown in the memory block in the said current caption content to be shown; Afterwards with the original position of the original position abscissa of said captions viewing area on video memory as said current caption content to be shown; And, the character to be pasted of respective widths in the said current caption content to be shown that prestores is attached to the relevant position of video memory according to the abscissa of said current bebinning character to be shown in the memory block;
When the initial abscissa of said current caption content to be shown in the memory block is less than or equal to the difference of caption content effective width in width and the memory block of said captions viewing area; Calculate the non-effective width of current caption content to be shown described in the memory block; Afterwards the initial abscissa of said current caption content to be shown in the memory block navigated to the captions afterbody of said current caption content to be shown; And calculate by the non-effective width of the said current caption content to be shown that calculates and to wait to paste the position abscissa of character on video memory in the said current caption content to be shown; Wait to paste the position abscissa of character on video memory according in the said current caption content to be shown that calculates afterwards, character said to be pasted is attached to the relevant position in the said video memory;
When the captions tail ordinate of said current caption content to be shown in video memory is the top edge of said captions viewing area, the initial ordinate of said current caption content to be shown in video memory navigated to the lower limb of said captions viewing area.
Simultaneously; The reference axis of supposing said display interface is positive direction downwards; If said special efficacy display mode is a scroll display mode from top to bottom; Then said the caption content current to be shown that prestores is carried out special effect processing, and the step of reading in based on the video memory of the playback terminal of embedded system according to the said current caption content to be shown that result will prestore may further comprise the steps again:
At the initial ordinate of said current caption content to be shown in video memory during greater than the original position ordinate of said captions viewing area on video memory; Calculate the ordinate of character to be shown in said video memory in the said current caption content to be shown, and the character to be pasted of respective widths is attached to the relevant position of said video memory in the said current caption content to be shown that will prestore;
When the initial ordinate of said current caption content to be shown in video memory is less than or equal to the original position ordinate of said captions viewing area on video memory; Calculate the captions length that current demonstration caption content is eaten by captions viewing area top edge, and the initial ordinate of current caption content to be shown in video memory navigated to the original position ordinate of said captions viewing area on video memory; According to the captions length that calculates, calculate the initial ordinate of current caption content to be shown in the memory block; Begin from the initial ordinate of said current caption content to be shown the memory block, the character to be pasted of respective widths is attached to the relevant position of said video memory;
When the captions tail ordinate of said current caption content to be shown in video memory is the top edge of said captions viewing area, the initial ordinate of said current caption content to be shown in video memory navigated to the lower limb of said captions viewing area.
If said special efficacy display mode is a scroll display mode from top to bottom; Then said the caption content current to be shown that prestores is carried out special effect processing, and the step of reading in based on the video memory of the playback terminal of embedded system according to the said current caption content to be shown that result will prestore may further comprise the steps again:
When the initial ordinate of said current caption content to be shown in video memory less than the height of original position ordinate and the captions viewing area of said captions viewing area on video memory and the time; Calculate the ordinate of character to be shown in video memory in the said current caption content to be shown, and the character to be pasted of respective widths is attached to the relevant position of said video memory in the said current caption content to be shown that will prestore;
The initial ordinate of said current caption content to be shown in video memory more than or equal to the height of original position ordinate and the said captions viewing area of said captions viewing area on video memory and the time; Calculate the captions length that said current demonstration caption content is eaten by captions viewing area lower limb, afterwards the initial ordinate of said current caption content to be shown in video memory navigated to the final position ordinate of said captions viewing area on video memory; According to the captions length that calculates, calculate the initial ordinate of current caption content to be shown in the memory block; Begin from the initial ordinate of said current caption content to be shown the memory block, just the character to be pasted of respective widths is attached to the relevant position of said video memory.
In the caption presentation method of above-mentioned playback terminal based on embedded system, said memory block can be a buffer area; In the step of said reception captions special efficacy shows signal with according to preset pairing captions attribute information of said captions special efficacy shows signal and special efficacy display mode; The caption content current to be shown that prestores is carried out can also may further comprise the steps between the step of special effect processing:
According to the said captions special efficacy shows signal that receives, in internal memory, open up at least one said buffer area, the pairing caption content of said captions special efficacy shows signal that prestores in the internal memory is loaded into opens up in the buffer area.
Another purpose of the embodiment of the invention is to provide a kind of caption display system of the playback terminal based on embedded system, and said system comprises:
Signal receiving module is used to receive captions special efficacy shows signal;
Presetting module is used for pairing captions attribute information of said captions special efficacy shows signal and special efficacy display mode that preset said signal receiving module receives;
Memory module is used to store captions attribute information, special efficacy display mode and the current caption content to be shown of the preset said correspondence of said captions special efficacy shows signal of said presetting module;
Special efficacy processing module; Be used for said captions attribute information and special efficacy display mode according to said memory module storage; Said current caption content to be shown to said memory module storage is carried out special effect processing; And, the said current caption content to be shown of said memory module storage is read in the video memory based on the playback terminal of embedded system according to result;
Display module is used for the pairing special efficacy display mode of said captions special efficacy shows signal with the storage of said memory module and shows that said special efficacy processing module reads in the said current caption content to be shown of said video memory.
In the caption display system of above-mentioned playback terminal based on embedded system, said memory module can be the internal memory of said playback terminal based on embedded system, and then said system can also comprise:
Buffer area is created module; Be used for according to the received captions special efficacy shows signal of said signal receiving module; In said internal memory, open up at least one buffer area, the pairing caption content of said captions special efficacy shows signal is loaded in the said buffer area of opening up;
Buffer area in the said memory module is used to store said the presetting module preset pairing captions attribute information of said captions special efficacy shows signal, special efficacy display mode and current caption content to be shown; Said special efficacy processing module is used for said captions attribute information and the special efficacy display mode according to the said buffer area storage of said memory module; Caption content current to be shown to the said buffer area storage in the said memory module is carried out special effect processing; And, the caption content current to be shown of the said buffer area storage in the said memory module is read in said video memory according to result; Said display module is used for showing current caption content to be shown with corresponding special efficacy display mode.
Another purpose of the embodiment of the invention is to provide a kind of playback terminal based on embedded system, and said terminal comprises as stated a caption display system based on the playback terminal of embedded system.
The display effect that exists when realizing that to the method that superposes through static state in the prior art captions show is single, the shortcoming of appreciative value difference; The caption presentation method of the playback terminal based on embedded system provided by the invention and system are when realizing that special efficacy shows; Also through the preset pairing captions attribute information of captions special efficacy shows signal; Make current caption content to be shown can be shown in arbitrary position of display interface, enriched display effect, improved appreciative value.
Description of drawings
Fig. 1 is the flow chart based on the caption presentation method of the playback terminal of embedded system that first embodiment of the invention provides;
Fig. 2 is the flow chart based on the caption presentation method of the playback terminal of embedded system that second embodiment of the invention provides;
Fig. 3 is the structure chart based on the caption display system of the playback terminal of embedded system that first embodiment of the invention provides;
Fig. 4 is the structure chart based on the caption display system of the playback terminal of embedded system that second embodiment of the invention provides.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Problem to the prior art existence; The preset special efficacy display mode of the caption presentation method based on the playback terminal of embedded system that the embodiment of the invention provides; And after receiving captions special efficacy shows signal, current caption content to be shown is handled, show current caption content to be shown with preset special efficacy display mode afterwards.
The flow process that Fig. 1 shows that first embodiment of the invention provides based on the caption presentation method of the playback terminal of embedded system.
In step S101, receive captions special efficacy shows signal.
In step S102; According to preset pairing captions attribute information of captions special efficacy shows signal and special efficacy display mode; Caption content current to be shown to prestoring is carried out special effect processing, and reads in video memory according to the caption content current to be shown that result will prestore.
Particularly, this captions attribute information comprise the captions viewing area in the original position abscissa x on the video memory, captions viewing area at the width width of the original position ordinate y on the video memory, captions viewing area, the height height of captions viewing area, the initial abscissa src_x of caption content current to be shown in the memory block that prestores, initial ordinate src_y, current to be shown caption content initial abscissa dst_x, current to be shown caption content the initial ordinate dst_y in video memory in video memory of caption content current to be shown in the memory block that prestores.
Particularly, can be not limited to be Pop-up display mode, roll display module, from left to right scroll display mode, scroll display mode, scroll display mode from top to bottom from top to bottom from right to left to this special efficacy display mode; And when this special efficacy display mode be the Pop-up display mode, from right to left the roll display module, from left to right during scroll display mode; Current caption content to be shown is a forward in the memory block; With the X axle of display interface in the same way; And when this special efficacy display mode be, from top to bottom scroll display mode, from top to bottom during scroll display mode, in the memory block current caption content to be shown before sidespin 90 degree under the special efficacy display mode, vertical with the X-direction of display interface.In addition, the storage order of current caption content to be shown in the memory block is corresponding with the displaying contents order of caption content on display interface, and top title comes the front, and the captions tail comes the back.
The step that the caption content current to be shown that wherein, will prestore according to result is read in video memory can may further comprise the steps again: definition first passage Y and second channel NX; The memory address of the memory block that prestores current caption content to be shown is related with first passage Y; The memory address of video memory is related with second channel NX; Memory address content that will be related with first passage Y put into second channel NX related memory address zone.
In the first embodiment of the invention; When the special efficacy display mode is the Pop-up display mode; Caption content current to be shown to prestoring is carried out special effect processing; And be specially:, directly read the relevant position that caption content current to be shown that prestores and the caption content current to be shown that will read are attached to video memory according to initial abscissa, the initial ordinate of current caption content to be shown in video memory of the caption content current to be shown in the captions attribute information in video memory according to the step that the caption content current to be shown that result will prestore is read in video memory.
In the first embodiment of the invention; The reference axis of supposing display interface is positive direction to the right; Then when the special efficacy display mode be from right to left during scroll display mode; Caption content current to be shown to prestoring is carried out special effect processing; And be specially: during greater than the original position abscissa of captions viewing area on video memory, calculate the abscissa of character to be shown in video memory in the current caption content to be shown at the initial abscissa of current caption content to be shown in video memory according to the step that the caption content current to be shown that result will prestore is read in video memory; The character to be pasted of respective widths in the caption content current to be shown that prestores is attached to the relevant position of video memory.
Wherein, The rolling speed of supposing preset current caption content to be shown is disp_speed; The step of then calculating the abscissa of character to be shown in video memory in the current caption content to be shown can be expressed as: dst_x-=disp_speed, and the initial value of dst_x be initial abscissa and the captions viewing area of captions viewing area on video memory width with.
When the initial abscissa of current caption content to be shown in video memory is less than or equal to the original position abscissa of captions viewing area on video memory; Explain that then the top title of current caption content to be shown has been rolled to the left hand edge of captions viewing area; Need handle this moment to the current demonstration caption content captions of eating; And the caption content current to be shown that prestores carried out special effect processing, the step that the caption content current to be shown that will prestore according to result is read in video memory is specially: calculate the captions length that current demonstration caption content is eaten by captions viewing area left hand edge; The initial abscissa of current caption content to be shown in video memory navigated to the original position abscissa of captions viewing area on video memory; According to the captions length that calculates, calculate the initial abscissa of current caption content to be shown in the memory block; Begin from the initial abscissa of current caption content to be shown the memory block, the character to be pasted of respective widths is attached to the relevant position in the video memory.
If the hypothesis captions length of eating is delta, the step of then calculating the captions length that current demonstration caption content eaten by captions viewing area left hand edge can be expressed as: delta=x-dst_x; The step that the initial abscissa of current caption content to be shown in video memory is navigated to the original position abscissa of captions viewing area on video memory can be expressed as: dst_x=x: according to the captions length that calculates; The step of calculating the initial abscissa of current caption content to be shown in the memory block can be expressed as: src_x+=delta, and the initial value of src_x is 0.
When the captions tail abscissa of current caption content to be shown in video memory is the left hand edge of captions viewing area; Explain that then whole current caption content to be shown is eaten fully; Then the initial abscissa dst_x of current caption content to be shown in video memory navigated to the right hand edge of captions viewing area; Even the initial abscissa dst_x of current caption content to be shown in video memory be again original position abscissa and the captions viewing area of captions viewing area on video memory width and, to begin captions rolling next time.
For fear of when the initial abscissa of current caption content to be shown in the memory block greater than 0 the time; Excessive character duration to be pasted can make the captions afterbody unroll to lift one's head; In the first embodiment of the invention, the width of waiting to paste character is the minimum value of the width and the captions viewing area width of current caption content to be shown in the memory block.
Preferably, in the first embodiment of the invention, when the special efficacy display mode is from right to left during scroll display mode, the initial value of the initial abscissa src_x of current caption content to be shown in the memory block is 0; The initial value of the initial ordinate src_y of current caption content to be shown in the memory block is 0; The initial value of the initial abscissa dst_x of current caption content to be shown in video memory satisfies: dst_x=x+width; The initial value of the initial ordinate dst_y of current caption content to be shown in video memory satisfies: dst_y=y.
In the first embodiment of the invention; The reference axis of supposing display interface is positive direction to the right; Then when the special efficacy scroll display mode be from left to right during scroll display mode; Caption content current to be shown to prestoring is carried out special effect processing; And be specially according to the step that the caption content current to be shown that result will prestore is read in video memory: the initial abscissa src_x of current caption content to be shown in the memory block be greater than the difference of caption content effective width buf_width in the width width of captions viewing area and the memory block, during src_x＞width-buf_width, calculates the abscissa of bebinning character to be shown in the memory block in the current caption content to be shown that is:; With the original position of the original position abscissa x of captions viewing area on video memory as caption content to be shown; According to the abscissa of bebinning character to be shown in the memory block that calculates, the character to be pasted of respective widths in the caption content current to be shown that prestores is attached to the relevant position of video memory.The rolling speed of supposing preset current caption content to be shown is disp_speed, and the step of then calculating the abscissa of bebinning character to be shown in the memory block in the current caption content to be shown can be expressed as: src_x-=disp_speed.Thereby, realized that current caption content to be shown rolls to right hand edge from the left hand edge of captions viewing area along with the increase of waiting to paste character duration.
Be less than or equal to the difference of caption content effective width buf_width in width width and the memory block of captions viewing area at the initial abscissa src_x of current caption content to be shown in the memory block; That is: during src_x＜=width-buf_width; Mean that the captions tail of current caption content to be shown has been rolled to the left hand edge of captions viewing area; Then this moment the caption content current to be shown that prestores is carried out special effect processing; And be specially: the non-effective width of calculating current caption content to be shown in the memory block according to the step that the caption content current to be shown that result will prestore is read in video memory; In this effective width, do not have caption content, can be regarded as the width of captions viewing area left hand edge to current caption content afterbody to be shown; The initial abscissa src_x of current caption content to be shown in the memory block navigated to the captions afterbody of current caption content to be shown; Calculate by the non-effective width of the current caption content to be shown that calculates and to wait to paste the position abscissa dst_x of character on video memory in the current caption content to be shown; Paste the position abscissa dst_x of character on video memory according to waiting in the caption content current to be shown that calculates, the character to be pasted that prestores is attached to the relevant position in the video memory.
If the non-effective width of the current caption content to be shown of hypothesis is delta ', the step of then calculating the non-effective width of current caption content to be shown in the memory block can be expressed as: delta '=(width-buf_width)-src_x; The step that the initial abscissa src_x of current caption content to be shown in the memory block is navigated to the captions afterbody of current caption content to be shown can be expressed as: src_x=width-buf_width; Calculate by the non-effective width of the current caption content to be shown that calculates and to wait in the current caption content to be shown that the step of pasting the position abscissa dst_x of character on video memory can be expressed as: dst_x+=delta '.
When the afterbody of current caption content to be shown is rolled to the right hand edge of captions viewing area; Explain that then whole current caption content to be shown is eaten fully; The initial abscissa dst_x of current caption content to be shown in video memory navigated to the original position abscissa x of captions viewing area on video memory; The initial abscissa src_x of current caption content to be shown in the memory block orientated as the width width of captions viewing area; Promptly make: dst_x=x, and src_x=width, so that the position of the initial abscissa dst_x of current caption content to be shown in video memory comes back to the left hand edge of captions viewing area; And the initial abscissa src_x of current caption content to be shown in the memory block gets back to the position of top title in the memory block, beginning captions rolling next time.
Preferably, in the first embodiment of the invention, when the special efficacy scroll display mode is from left to right during scroll display mode, the initial value of the initial abscissa src_x of current caption content to be shown in the memory block is width; The initial value of the initial ordinate src_y of current caption content to be shown in the memory block is 0; The initial value of the initial abscissa dst_x of current caption content to be shown in video memory is x; The initial value of the initial ordinate dst_y of current caption content to be shown in video memory is y.
In the first embodiment of the invention; The reference axis of supposing display interface is positive direction downwards; Then when the special efficacy display mode be from top to bottom during scroll display mode; Caption content current to be shown to prestoring is carried out special effect processing; And be specially: during greater than the original position ordinate of captions viewing area on video memory, calculate the ordinate of character to be shown in video memory in the current caption content to be shown at the initial ordinate of current caption content to be shown in video memory according to the step that the caption content current to be shown that result will prestore is read in video memory; The character to be pasted of respective widths in the caption content current to be shown that prestores is attached to the relevant position of video memory.Wherein, The rolling speed of supposing preset current caption content to be shown is disp_speed; The step of then calculating the ordinate of character to be shown in video memory in the current caption content to be shown can be expressed as: dst_y-=disp_speed, and the initial value of dst_x be initial ordinate and the captions viewing area of captions viewing area on video memory height with.
When the initial ordinate of current caption content to be shown in video memory is less than or equal to the original position ordinate of captions viewing area on video memory; Mean that the top title of current caption content to be shown has been rolled to the top edge of captions viewing area; Need handle the current demonstration caption content captions of eating; Then this moment the caption content current to be shown that prestores is carried out special effect processing, and be specially: calculate the captions length that current demonstration caption content is eaten by captions viewing area top edge according to the step that the caption content current to be shown that result will prestore is read in video memory; The initial ordinate of current caption content to be shown in video memory navigated to the original position ordinate of captions viewing area on video memory; According to the captions length that calculates, calculate the initial ordinate of current caption content to be shown in the memory block; Begin from the initial ordinate of current caption content to be shown the memory block, the character to be pasted of respective widths is attached to the relevant position of video memory.If the hypothesis captions length of eating is delta, the step of then calculating the captions length that current demonstration caption content eaten by captions viewing area top edge can be expressed as: delta=y-dst_y; The step that the initial ordinate of current caption content to be shown in video memory is navigated to the original position ordinate of captions viewing area on video memory can be expressed as: dst_y=y: according to the captions length that calculates; The step of calculating the initial ordinate of current caption content to be shown in the memory block can be expressed as: src_y+=delta, and the initial value of src_y is 0.
When the captions tail ordinate of current caption content to be shown in video memory is the top edge of captions viewing area; Mean that whole current caption content to be shown is eaten fully; Then the initial ordinate dst_y of current caption content to be shown in video memory navigated to the lower limb of captions viewing area; The initial ordinate dst_y of current caption content to be shown in video memory be again original position ordinate and the captions viewing area of captions viewing area on video memory height with, with beginning captions rolling next time.
For fear of when the initial ordinate of current caption content to be shown in the memory block greater than 0 the time; Excessive character duration to be pasted can make the captions afterbody unroll to lift one's head; In display mode from top to bottom, the height of waiting to paste character is the minimum value of the height and the captions viewing area height of current caption content to be shown in the memory block.
Preferably, in the first embodiment of the invention, when the special efficacy display mode is from top to bottom during scroll display mode, the initial value of the initial abscissa src_x of current caption content to be shown in the memory block is 0; The initial value of the initial ordinate src_y of current caption content to be shown in the memory block is 0; The initial value of the initial abscissa dst_x of current caption content to be shown in video memory is x; The initial value of the initial ordinate dst_y of current caption content to be shown in video memory satisfies: dst_y=y+height.
In the first embodiment of the invention; The reference axis of supposing display interface is positive direction downwards; Then when the special efficacy display mode be from top to bottom during scroll display mode; Caption content current to be shown to prestoring is carried out special effect processing; And be specially according to the step that the caption content current to be shown that result will prestore is read in video memory: the initial ordinate of current caption content to be shown in video memory less than the height of original position ordinate and the captions viewing area of captions viewing area on video memory and the time, calculate the ordinate of character to be shown in video memory in the current caption content to be shown; The character to be pasted of respective widths in the caption content current to be shown that prestores is attached to the relevant position of video memory.Wherein, The rolling speed of supposing preset current caption content to be shown is disp_speed; The step of then calculating the ordinate of character to be shown in video memory in the current caption content to be shown can be expressed as: dst_y+=disp_speed, and the initial value of dst_x is the initial ordinate of captions viewing area on video memory.
The initial ordinate of current caption content to be shown in video memory more than or equal to the height of original position ordinate and the captions viewing area of captions viewing area on video memory and the time; Mean that the top title of current caption content to be shown has been rolled to the lower limb of captions viewing area; Need handle the current demonstration caption content captions of eating; Then this moment the caption content current to be shown that prestores is carried out special effect processing, and be specially: calculate the captions length that current demonstration caption content is eaten by captions viewing area lower limb according to the step that the caption content current to be shown that result will prestore is read in video memory; The initial ordinate of current caption content to be shown in video memory navigated to the final position ordinate of captions viewing area on video memory; According to the captions length that calculates, calculate the initial ordinate of current caption content to be shown in the memory block; Begin from the initial ordinate of current caption content to be shown the memory block, the character to be pasted of respective widths is attached to the relevant position of video memory.If the hypothesis captions length of eating is delta, the step of then calculating the captions length that current demonstration caption content eaten by captions viewing area lower limb can be expressed as: delta=dst_y-(y+height); The step that the initial ordinate of current caption content to be shown in video memory is navigated to the original position ordinate of captions viewing area on video memory can be expressed as: dst_y=y+height: according to the captions length that calculates, the step of calculating the initial ordinate of current caption content to be shown in the memory block can be expressed as: src_y-=delta.
Because under this kind special efficacy display mode; Caption content be from the captions viewing area below the original position ordinate y on the video memory, abscissa x begins to show with the position on the right side; And the zone more than the initial ordinate dst_y of current caption content to be shown in video memory is because outside the scope of captions viewing area; Can not show caption content; Therefore the preset initial ordinate dst_y and the initial ordinate src_y of current caption content to be shown in the memory block of caption content current to be shown in video memory all need deduct certain width, is positioned at the top edge of captions viewing area to guarantee the initial ordinate dst_y of current caption content to be shown in video memory.
For fear of when the initial ordinate of current caption content to be shown in the memory block greater than 0 the time; Excessive character duration to be pasted can make the captions afterbody unroll to lift one's head; In display mode from top to bottom, the height of waiting to paste character is the minimum value of the height and the captions viewing area height of current caption content to be shown in the memory block.
Preferably, in the first embodiment of the invention, when the special efficacy display mode is from top to bottom during scroll display mode, the initial value of the initial abscissa src_x of current caption content to be shown in the memory block is 0; The initial value of the initial ordinate src_y of current caption content to be shown in the memory block is height; The initial value of the initial abscissa dst_x of current caption content to be shown in video memory is x; The initial value of the initial ordinate dst_y of current caption content to be shown in video memory is y.
In step S103,, show the caption content current to be shown of reading in video memory at display interface with the preset pairing special efficacy display mode of captions special efficacy shows signal.
Show in order to realize the timing of caption content and/or to decide number of times; First embodiment of the invention is after step S103; Can also may further comprise the steps: whether the demonstration time of judging the current caption content to be shown that shows reaches Preset Time and/or shows whether number of times reaches preset times; Be then to load next caption content to be shown, otherwise proceed the demonstration next time of current caption content to be shown to the memory block.
And in order further to optimize display effect, first embodiment of the invention can also may further comprise the steps after step S103: the need that receive user's input are removed the start-stop coordinate and the height of captions region of streaking; According to start-stop coordinate that receives and height the title back data are read in the memory block; Remove the captions region of streaking at need and show title back.
In terms of existing technologies; First embodiment of the invention provide based on the caption presentation method of the playback terminal of embedded system when realizing that special efficacy shows; Also through the preset pairing captions attribute information of captions special efficacy shows signal; Make current caption content to be shown can be shown in arbitrary position of display interface, enriched display effect, improved appreciative value.In addition; In every kind of special efficacy procedure for displaying; All need not to wipe video memory earlier, write again again, but directly be affixed on the relevant position of video memory after current caption content to be shown read, improved system's execution speed; Display effect has further been optimized in the generation of scintillation when having avoided special efficacy to show.
The flow process that Fig. 2 shows that second embodiment of the invention provides based on the caption presentation method of the playback terminal of embedded system.
In step S201, receive captions special efficacy shows signal.
In step S202, according to the captions special efficacy shows signal that receives, in internal memory, open up at least one buffer area, the pairing caption content of captions special efficacy shows signal that prestores in the internal memory is loaded in the buffer area of opening up.
Wherein, the quantity of buffer area is by the decision of the width of captions viewing area, and for the demonstration that makes that roll titles is can be on display interface smooth continuously, in the second embodiment of the invention, the quantity of buffer area is three at most.
In step S203; According to preset pairing captions attribute information of captions special efficacy shows signal and special efficacy display mode; Caption content current to be shown to prestoring is carried out special effect processing, and reads in video memory according to the caption content current to be shown that result will prestore.
In the second embodiment of the invention; As above step S103 is said for the detailed process of step S203; Different is; The memory block of this moment is buffer area, and in every kind of special efficacy display mode, initial abscissa dst_x in video memory of initial ordinate src_y in the memory block of the initial abscissa src_x of current caption content to be shown in the memory block, current caption content to be shown, current caption content to be shown, the step that the initial ordinate dst_y of current caption content to be shown in video memory composes initial value is all accomplished in step S102 implementation; For fear of repetition, repeat no more here.
In step S204, show the caption content current to be shown of reading in video memory with the pairing special efficacy display mode of preset captions special efficacy shows signal.
Different with first embodiment of the invention; Second embodiment of the invention provide based on the caption presentation method of the playback terminal of embedded system on the basis of first embodiment of the invention; Also in internal memory, opened up at least one buffer area, and caption content has been stored in the buffer area, when carrying out the special efficacy demonstration; Directly read the caption content of relevant position in the buffer area, improved the execution efficient of equipment integral.
Fig. 3 is the structure based on the caption display system of the playback terminal of embedded system that first embodiment of the invention provides, and for the ease of explanation, only shows the part relevant with first embodiment of the invention.
The caption display system based on the playback terminal of embedded system that first embodiment of the invention provides comprises: signal receiving module 11 is used to receive captions special efficacy shows signal; Presetting module 12 is used for pairing captions attribute information of captions special efficacy shows signal and special efficacy display mode that preset said signal receiving module 11 receives; Memory module 13 is used to store the pairing captions attribute information of captions special efficacy shows signal, special efficacy display mode and the current caption content to be shown that presetting module 12 is preset; Special efficacy processing module 14; Be used for captions attribute information and special efficacy display mode according to memory module 13 storages; Caption content current to be shown to memory module 13 storages is carried out special effect processing, and according to result, the caption content current to be shown of memory module 13 storages is read in video memory; Display module 15 is used for the pairing special efficacy display mode of captions special efficacy shows signal with memory module 13 storages, and demonstration special efficacy processing module 14 is read in the caption content current to be shown of video memory.
In the caption display system that first embodiment of the invention provides based on the playback terminal of embedded system; When the special efficacy display mode be respectively the Pop-up display mode, from right to left the roll display module, from left to right scroll display mode, from top to bottom scroll display mode, from top to bottom during scroll display mode; As above the caption presentation method part based on the playback terminal of embedded system that provides of first embodiment of the invention is said for the concrete processing procedure of special efficacy processing module 14, repeats no more at this.
In terms of existing technologies; First embodiment of the invention provide based on the caption display system of the playback terminal of embedded system when realizing that special efficacy shows; Also through the presetting module 12 preset pairing captions attribute informations of captions special efficacy shows signal; Make current caption content to be shown can be shown in arbitrary position of display interface, enriched display effect, improved appreciative value.In addition; In every kind of special efficacy procedure for displaying; All need not to wipe video memory earlier, write again again, but directly be affixed on the relevant position of video memory after by special efficacy processing module 14 current caption content to be shown being read, improved system's execution speed; Display effect has further been optimized in the generation of scintillation when having avoided special efficacy to show.
The embodiment of the invention also provides a kind of playback terminal based on embedded system, comprises as stated a caption display system based on the playback terminal of embedded system.Should be based on the playback terminal of the embedded system playback terminal of video monitoring terminal, video intercom terminal or network advertising machine preferably.
The structure based on the caption display system of the playback terminal of embedded system as Fig. 4 shows that second embodiment of the invention provides for the ease of explanation, only shows the part relevant with second embodiment of the invention.Wherein, memory module 13 is the internal memory based on the playback terminal of embedded system.
Different with the caption display system that first embodiment of the invention provides based on the playback terminal of embedded system; Second embodiment of the invention provide based on the caption display system of the playback terminal of embedded system on the basis of Fig. 3; Also comprise: buffer area is created module 16; Be used for the captions special efficacy shows signal that receives according to signal receiving module 11; In internal memory, open up at least one buffer area, the pairing caption content of captions special efficacy shows signal that prestores in the internal memory is loaded in the buffer area of opening up.And buffer area is created the width decision of the quantity of the buffer area that module 16 opens up by the captions viewing area, and for the demonstration that makes that roll titles is can be on display interface smooth continuously, in the second embodiment of the invention, the quantity of buffer area is three at most.
With said different to Fig. 3; In the caption display system based on the playback terminal of embedded system that second embodiment of the invention provides, the buffer area in the memory module 13 is used to store the presetting module 12 preset pairing captions attribute information of captions special efficacy shows signal, special efficacy display mode and current caption content to be shown; Special efficacy processing module 14 is used for captions attribute information and the special efficacy display mode according to the buffer area storage of memory module 13; Caption content current to be shown to the storage of the buffer area in the memory module 13 is carried out special effect processing; And, the caption content current to be shown of the storage of the buffer area in the memory module 13 is read in video memory according to result; Display module 15 is used for showing that with the pairing special efficacy display mode of captions special efficacy shows signal of the buffer area storage of memory module 13 special efficacy processing module 14 is read in the caption content current to be shown of video memory.
Different with first embodiment of the invention; Second embodiment of the invention provide based on the caption display system of the playback terminal of embedded system on the basis of first embodiment of the invention; Also increased the buffer area establishment module 16 that is used to open up buffer area, and caption content has been stored in the buffer area, when carrying out the special efficacy demonstration; Directly read the caption content of relevant position in the buffer area, improved the execution efficient of equipment integral.
The embodiment of the invention also provides a kind of playback terminal based on embedded system, comprises the caption display system of a playback terminal based on embedded system as above shown in Figure 4.Should be based on the playback terminal of the embedded system playback terminal of video monitoring terminal, video intercom terminal or network advertising machine preferably.
In sum; The caption presentation method of the playback terminal based on embedded system provided by the invention and system are when realizing that special efficacy shows; Also through the preset pairing captions attribute information of captions special efficacy shows signal; Make current caption content to be shown can be shown in arbitrary position of display interface, enriched display effect, improved appreciative value.Have again; In every kind of special efficacy procedure for displaying; All need not to wipe video memory earlier, write again again, but directly be affixed on the relevant position of video memory after current caption content to be shown read, improved system's execution speed; Display effect has further been optimized in the generation of scintillation when having avoided special efficacy to show.Have again,, make when carrying out the special efficacy demonstration, can directly read the caption content of relevant position in the buffer area, improved the execution efficient of equipment integral through opening up the buffer area of storage caption content.In addition, can also be after showing caption content, to the displaying contents processing of trailing, further optimized display effect.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is can control relevant hardware through program to accomplish; Described program can be in being stored in a computer read/write memory medium; Described storage medium is like ROM/RAM, disk, CD etc.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the caption presentation method based on the playback terminal of embedded system is characterized in that, said method comprising the steps of:
Receive captions special efficacy shows signal;
According to preset pairing captions attribute information of said captions special efficacy shows signal and special efficacy display mode; Caption content current to be shown to prestoring is carried out special effect processing, and reads in the video memory based on the playback terminal of embedded system according to the said current caption content to be shown that result will prestore;
With the preset pairing special efficacy display mode of said captions special efficacy shows signal, show the caption content current to be shown of reading in said video memory at display interface.
2. the caption presentation method of the playback terminal based on embedded system as claimed in claim 1; It is characterized in that said captions attribute information comprises: the original position abscissa of captions viewing area on video memory, original position ordinate, the width of captions viewing area, the height of captions viewing area; And the initial abscissa of the said current caption content to be shown that prestores in the memory block, the initial ordinate of said current caption content to be shown in the memory block that prestores; With initial abscissa, said current to be shown caption content the initial ordinate in video memory of said current caption content to be shown in video memory.
3. the caption presentation method of the playback terminal based on embedded system as claimed in claim 2 is characterized in that the reference axis of said display interface is a positive direction to the right, and said special efficacy display mode is a scroll display mode from right to left; Said the caption content current to be shown that prestores is carried out special effect processing, and the step of reading in based on the video memory of the playback terminal of embedded system according to the said current caption content to be shown that result will prestore may further comprise the steps again:
When the initial abscissa of said current caption content to be shown in video memory during greater than the original position abscissa of said captions viewing area on video memory; Calculate the abscissa of character to be shown in video memory in the said current caption content to be shown, the character to be pasted of respective widths is attached to the relevant position of said video memory in the said current caption content to be shown that will prestore afterwards;
When the initial abscissa of said current caption content to be shown in video memory is less than or equal to the original position abscissa of said captions viewing area on video memory; Calculate the captions length that current demonstration caption content is eaten by captions viewing area left hand edge, and the initial abscissa of said current caption content to be shown in video memory navigated to the original position abscissa of said captions viewing area on video memory; According to the captions length that calculates, calculate the initial abscissa of current caption content to be shown in the memory block afterwards; Begin from the initial abscissa of said current caption content to be shown the memory block afterwards, the character to be pasted of respective widths is attached to the relevant position of said video memory;
When the afterbody of said current caption content to be shown is rolled to the right hand edge of said captions viewing area, the initial abscissa of said current caption content to be shown in video memory navigated to the right hand edge of said captions viewing area.
4. the caption presentation method of the playback terminal based on embedded system as claimed in claim 2 is characterized in that the reference axis of said display interface is a positive direction to the right, and said special efficacy display mode is a scroll display mode from left to right; Said the caption content current to be shown that prestores is carried out special effect processing, and the step of reading in based on the video memory of the playback terminal of embedded system according to the said current caption content to be shown that result will prestore may further comprise the steps again:
When the initial abscissa of said current caption content to be shown in the memory block greater than the width of said captions viewing area and said memory block in during the difference of caption content effective width; Calculate the abscissa of bebinning character to be shown in the memory block in the said current caption content to be shown; Afterwards with the original position of the original position abscissa of said captions viewing area on video memory as said current caption content to be shown; And, the character to be pasted of respective widths in the said current caption content to be shown that prestores is attached to the relevant position of video memory according to the abscissa of said current bebinning character to be shown in the memory block;
When the initial abscissa of said current caption content to be shown in the memory block is less than or equal to the difference of caption content effective width in width and the memory block of said captions viewing area; Calculate the non-effective width of current caption content to be shown described in the memory block; Afterwards the initial abscissa of said current caption content to be shown in the memory block navigated to the captions afterbody of said current caption content to be shown; And calculate by the non-effective width of the said current caption content to be shown that calculates and to wait to paste the position abscissa of character on video memory in the said current caption content to be shown; Wait to paste the position abscissa of character on video memory according in the said current caption content to be shown that calculates afterwards, character said to be pasted is attached to the relevant position in the said video memory;
When the captions tail ordinate of said current caption content to be shown in video memory is the top edge of said captions viewing area, the initial ordinate of said current caption content to be shown in video memory navigated to the lower limb of said captions viewing area.
5. the caption presentation method of the playback terminal based on embedded system as claimed in claim 2 is characterized in that the reference axis of said display interface is a positive direction downwards, and said special efficacy display mode is a scroll display mode from top to bottom; Said the caption content current to be shown that prestores is carried out special effect processing, and the step of reading in based on the video memory of the playback terminal of embedded system according to the said current caption content to be shown that result will prestore may further comprise the steps again:
At the initial ordinate of said current caption content to be shown in video memory during greater than the original position ordinate of said captions viewing area on video memory; Calculate the ordinate of character to be shown in said video memory in the said current caption content to be shown, and the character to be pasted of respective widths is attached to the relevant position of said video memory in the said current caption content to be shown that will prestore;
When the initial ordinate of said current caption content to be shown in video memory is less than or equal to the original position ordinate of said captions viewing area on video memory; Calculate the captions length that current demonstration caption content is eaten by captions viewing area top edge, and the initial ordinate of current caption content to be shown in video memory navigated to the original position ordinate of said captions viewing area on video memory; According to the captions length that calculates, calculate the initial ordinate of current caption content to be shown in the memory block; Begin from the initial ordinate of said current caption content to be shown the memory block, the character to be pasted of respective widths is attached to the relevant position of said video memory;
When the captions tail ordinate of said current caption content to be shown in video memory is the top edge of said captions viewing area, the initial ordinate of said current caption content to be shown in video memory navigated to the lower limb of said captions viewing area.
6. the caption presentation method of the playback terminal based on embedded system as claimed in claim 2 is characterized in that the reference axis of said display interface is a positive direction downwards, and said special efficacy display mode is a scroll display mode from top to bottom; Said the caption content current to be shown that prestores is carried out special effect processing, and the step of reading in based on the video memory of the playback terminal of embedded system according to the said current caption content to be shown that result will prestore may further comprise the steps again:
When the initial ordinate of said current caption content to be shown in video memory less than the height of original position ordinate and the captions viewing area of said captions viewing area on video memory and the time; Calculate the ordinate of character to be shown in video memory in the said current caption content to be shown, and the character to be pasted of respective widths is attached to the relevant position of said video memory in the said current caption content to be shown that will prestore;
The initial ordinate of said current caption content to be shown in video memory more than or equal to the height of original position ordinate and the said captions viewing area of said captions viewing area on video memory and the time; Calculate the captions length that said current demonstration caption content is eaten by captions viewing area lower limb, afterwards the initial ordinate of said current caption content to be shown in video memory navigated to the final position ordinate of said captions viewing area on video memory; According to the captions length that calculates, calculate the initial ordinate of current caption content to be shown in the memory block; Begin from the initial ordinate of said current caption content to be shown the memory block, just the character to be pasted of respective widths is attached to the relevant position of said video memory.
7. like the caption presentation method of each described playback terminal based on embedded system of claim 2 to 6, it is characterized in that said memory block is a buffer area; In the step of said reception captions special efficacy shows signal with according to preset pairing captions attribute information of said captions special efficacy shows signal and special efficacy display mode; The caption content current to be shown that prestores is carried out between the step of special effect processing, further comprising the steps of:
According to the said captions special efficacy shows signal that receives, in internal memory, open up at least one said buffer area, the pairing caption content of said captions special efficacy shows signal that prestores in the internal memory is loaded into opens up in the buffer area.
8. the caption display system based on the playback terminal of embedded system is characterized in that, said system comprises:
Signal receiving module is used to receive captions special efficacy shows signal;
Presetting module is used for pairing captions attribute information of captions special efficacy shows signal and special efficacy display mode that the preset signals receiver module receives;
Memory module is used to store the pairing captions attribute information of said captions special efficacy shows signal, special efficacy display mode and current caption content to be shown;
Special efficacy processing module; Be used for captions attribute information and the special efficacy display mode stored according to memory module; Caption content current to be shown to said memory module storage is carried out special effect processing; And, current caption content to be shown is read in the video memory based on the playback terminal of embedded system according to result;
Display module is used for the pairing special efficacy display mode of said captions special efficacy shows signal with the storage of said memory module and shows that said special efficacy processing module reads in the caption content current to be shown of said video memory.
9. the caption display system of the playback terminal based on embedded system as claimed in claim 8 is characterized in that, said memory module is the internal memory of said playback terminal based on embedded system; Said system also comprises:
Buffer area is created module; Be used for according to the received captions special efficacy shows signal of said signal receiving module; In said internal memory, open up at least one buffer area, the pairing caption content of said captions special efficacy shows signal is loaded in the said buffer area of opening up;
Buffer area in the said memory module is used to store said the presetting module preset pairing captions attribute information of said captions special efficacy shows signal, special efficacy display mode and current caption content to be shown; Said special efficacy processing module is used for said captions attribute information and the special efficacy display mode according to the said buffer area storage of said memory module; Caption content current to be shown to the said buffer area storage in the said memory module is carried out special effect processing; And, the caption content current to be shown of the said buffer area storage in the said memory module is read in said video memory according to result; Said display module is used for showing current caption content to be shown with corresponding special efficacy display mode.
10. the playback terminal based on embedded system is characterized in that, said terminal comprises the caption display system like claim 8 or 9 described playback terminals based on embedded system.
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