CN104602095A - Acquiring and synchronous display method and system for combined desktop - Google Patents
Acquiring and synchronous display method and system for combined desktop Download PDFInfo
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- CN104602095A CN104602095A CN201410824389.1A CN201410824389A CN104602095A CN 104602095 A CN104602095 A CN 104602095A CN 201410824389 A CN201410824389 A CN 201410824389A CN 104602095 A CN104602095 A CN 104602095A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/242—Synchronization processes, e.g. processing of PCR [Program Clock References]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
- H04N21/4305—Synchronising client clock from received content stream, e.g. locking decoder clock with encoder clock, extraction of the PCR packets
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/433—Content storage operation, e.g. storage operation in response to a pause request, caching operations
- H04N21/4331—Caching operations, e.g. of an advertisement for later insertion during playback
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/85—Assembly of content; Generation of multimedia applications
- H04N21/854—Content authoring
- H04N21/8547—Content authoring involving timestamps for synchronizing content
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Controls And Circuits For Display Device (AREA)
Abstract
The invention provides acquiring and synchronous display method and system for a combined desktop. The method comprises the steps of acquiring DVI (Digital Video Interactive) images from each path through an acquiring end; setting a timestamp pts of each frame into the time that a field synchronizing signal of the frame appears; encoding the DVI image of each path and outputting a code stream; decoding and caching the code stream through a display end to form a plurality of cache arrays; determining whether to display the first frame of each cache array according to the current system time and the timestamp; if not, waiting; if displaying, displaying the frame at a corresponding area of the combined desktop, and then deleting the frame from the head of the array, so as to really recover a combined desktop signal. With the adoption of the system and method, the requirements on display links can be reduced, the cost can be reduced, and the DVI image of each path can be really recovered based on the display time.
Description
Technical field
The present invention relates to video image Display Technique field, more specifically, relate to a kind of combination desktop collection and synchronous display method and system.
Background technology
Combination desktop is by the desktop of multichannel picture composition.Such as a PC is provided with 4 video cards, often opens video card and exports 4 DVI(digital videos) picture, so this PC is just defeated amounts to out 16 road DVI pictures, and together, form the desktop of a large resolution, this desktop combines desktop to this 16 road DVI picture composition exactly.The mode of the hard synchronous acquisition of the many employings of each road DVI picture of current combination desktop, namely every road DVI of video card exports and is all connected to a DVI tablet, be responsible for each road DVI signals collecting to together by DVI tablet, then be combined into the picture of the large resolution of a frame, then externally export being encoded to IP signal.As shown in Figure 1, for 8 road DVI pictures, the combination desktop that many video cards outgoing traffic PC exports is formed by 2*4 DVI picture composition, accompanying drawing Zhong Ge road picture is separated by dotted line, this 8 road DVI picture of DVI0 ~ DVI7 is linked into DVI composite signal capturing and coding device, each road picture splices in inside by this encoder, and be then output into the complete desktop images after a width coding, the picture data after this coding is shared away with the form of IP signal usually.
There is 1 larger problem in this traditional method: the IP signal resolution after coding may be very large.As shown in Figure 1, if the resolution of every road DVI picture is 1920*1080, the resolution of the IP signal that so final coding exports is 7680*2160.To next one display link, this just means that it needs to support decoding and the display capabilities of super large resolution signal, this has higher requirement to display link, and device Application Range narrows greatly, and cost also corresponding raising is a lot.
Summary of the invention
The present invention is intended to solve the problems of the technologies described above at least to a certain extent.
Primary and foremost purpose of the present invention be overcome the cost of prior art high, high defect is required to display link, a kind of low cost is provided, the combination desktop collection low, screen synchronization is good and synchronous display method is required to display link.
The present invention also provides a kind of combination desktop collection and synchronous display system.
For solving the problems of the technologies described above, technical scheme of the present invention is as follows:
A kind of combination desktop collection and synchronous display method, described method is applied to desktop collection and synchronous display system, and described system comprises collection terminal and display end, said method comprising the steps of:
At collection terminal:
S1: gather multichannel DVI picture, a region of every road DVI picture correspondence combination desktop;
S2: at each road DVI picture, the time that the field sync signal timestamp pts of each frame being set to this frame occurs, to each road DVI picture coding output code flow;
At display end:
S3: decode to code stream, obtains picture data and the timestamp pts of each frame in the DVI picture of each road, to the frame of each road DVI picture buffer memory preset number, forms multichannel buffer queue;
S4: choose the first frame of a first frame time stamp road buffer queue the latest as initial display frame, the timestamp recording this frame is PST0, deletes the frame of timestamp before PST0 in buffer queue;
S5: initial display frame is shown in the corresponding region of combination desktop, system time when recording the display of this frame is T0, is then deleted from head of the queue by this frame;
S6: according to present system time and timestamp, each road buffer queue judges that its first frame is the need of display, if do not needed display, then waits for; As needs display, then in the corresponding region of combination desktop, this frame is shown, then this frame is deleted from head of the queue;
S7: repeat step S6, shows each road DVI picture at combination desktop.
A kind of combination desktop collection and synchronous display system, described system comprises display end and multiple collection terminal, each collection terminal gathers a road DVI picture, and described display end comprises control thread and multiple collecting thread and shows thread, each collecting thread and display thread correspondence one road DVI picture;
Collection terminal: for gathering DVI picture, the time that the field sync signal timestamp pts of each frame being set to this frame occurs, to each road DVI picture coding output code flow;
Control thread: for creating and control collecting thread and display thread;
Collecting thread: for decoding to code stream, obtains picture data and the timestamp pts of each frame in the DVI picture of each road, to the frame of each road DVI picture buffer memory preset number, forms multichannel buffer queue;
Display thread: for showing at the first frame of corresponding region to each road buffer queue of combination desktop according to present system time and timestamp, then this frame is deleted from head of the queue.
Compared with prior art, the beneficial effect of technical solution of the present invention is: the present invention combines desktop collection and synchronous display method, collection terminal gathers each road DVI picture, the time that the field sync signal timestamp pts of each frame being set to this frame occurs, then to each road DVI picture coding output code flow; Display end carries out decoding to code stream and buffer memory forms multichannel buffer queue; According to present system time and timestamp, each road buffer queue judges that its first frame is the need of display, if do not needed display, then wait for; As needs display, then in the corresponding region of combination desktop, this frame is shown, then this frame is deleted from head of the queue; Thus the combination desktop signals verily reduced.Gather each road signal respectively and show each road DVI picture in corresponding region, combination table face, reducing the requirement to display link, reduce cost; And according to its present system time and timestamp, each buffer queue judges that its first frame is the need of display, displaying time reduces each road DVI picture really.The present invention combines desktop collection and synchronous display system is the hardware foundation that said method realizes, and the combination of described method and system achieves collection and the simultaneous display of combination desktop.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that each road DVI picture of prior art adopts hard synchronous acquisition and display packing.
Fig. 2 is the schematic diagram that the present invention combines desktop collection and simultaneous display.
Fig. 3 is the schematic diagram that the present invention controls the drawing area of thread creation.
Fig. 4 is the schematic diagram of buffer queue of the present invention.
Buffer queue schematic diagram when Fig. 5 is initial display frame display.
Fig. 6 is the schematic diagram of buffer queue after deletion initial display frame.
Embodiment
Accompanying drawing, only for exemplary illustration, can not be interpreted as the restriction to this patent;
In order to better the present embodiment is described, some parts of accompanying drawing have omission, zoom in or out, and do not represent the size of actual product;
To those skilled in the art, in accompanying drawing, some known features and explanation thereof may be omitted is understandable.
Below in conjunction with drawings and Examples, technical scheme of the present invention is described further.
embodiment 1
A kind of combination desktop collection and synchronous display method, described method is applied to desktop collection and synchronous display system, and described system comprises collection terminal and display end, said method comprising the steps of:
At collection terminal:
S1: gather multichannel DVI picture, a region of every road DVI picture correspondence combination desktop;
S2: at each road DVI picture, the time that the field sync signal timestamp pts of each frame being set to this frame occurs, to each road DVI picture coding output code flow;
At display end:
S3: decode to code stream, obtains picture data and the timestamp pts of each frame in the DVI picture of each road, to the frame of each road DVI picture buffer memory preset number, forms multichannel buffer queue;
S4: choose the first frame of a first frame time stamp road buffer queue the latest as initial display frame, the timestamp recording this frame is PST0, deletes the frame of timestamp before PST0 in buffer queue;
S5: initial display frame is shown in the corresponding region of combination desktop, system time when recording the display of this frame is T0, is then deleted from head of the queue by this frame;
S6: according to present system time and timestamp, each road buffer queue judges that its first frame is the need of display, if do not needed display, then waits for; As needs display, then in the corresponding region of combination desktop, this frame is shown, then this frame is deleted from head of the queue;
S7: repeat step S6, shows each road DVI picture at combination desktop.
A kind of combination desktop collection and synchronous display system, described system comprises display end and multiple collection terminal, each collection terminal gathers a road DVI picture, and described display end comprises control thread and multiple collecting thread and shows thread, each collecting thread and display thread correspondence one road DVI picture;
Collection terminal: for gathering DVI picture, the time that the field sync signal timestamp pts of each frame being set to this frame occurs, to each road DVI picture coding output code flow;
Control thread: for creating and control collecting thread and display thread;
Collecting thread: for decoding to code stream, obtains picture data and the timestamp pts of each frame in the DVI picture of each road, to the frame of each road DVI picture buffer memory preset number, forms multichannel buffer queue;
Display thread: for showing at the first frame of corresponding region to each road buffer queue of combination desktop according to present system time and timestamp, then this frame is deleted from head of the queue.
The present invention combines desktop collection and synchronous display method, and collection terminal gathers each road DVI picture, the time that the field sync signal timestamp pts of each frame being set to this frame occurs, then to each road DVI picture coding output code flow; Display end carries out decoding to code stream and buffer memory forms multichannel buffer queue; According to present system time and timestamp, each road buffer queue judges that its first frame is the need of display, if do not needed display, then wait for; As needs display, then in the corresponding region of combination desktop, this frame is shown, then this frame is deleted from head of the queue; Thus the combination desktop signals verily reduced.Gather each road signal respectively and show each road DVI picture in corresponding region, combination table face, reducing the requirement to display link, reduce cost; And according to its present system time and timestamp, each buffer queue judges that its first frame is the need of display, displaying time reduces each road DVI picture really.The present invention combines desktop collection and synchronous display system is the hardware foundation that said method realizes, and the combination of described method and system achieves collection and the simultaneous display of combination desktop.
embodiment 2
The combination desktop of the present embodiment 2*4 road DVI picture composition is example, and the resolution of every road DVI picture is 1920*1080, and the picture frame per second of every road DVI signal is 60fps.
As shown in Figure 2, a kind of combination desktop collection and synchronous display system, described system comprises display end and 8 collection terminals, each collection terminal gathers a road DVI picture, described display end comprises control thread and 8 collecting threads and shows thread, each collecting thread and display thread correspondence one road DVI picture.
A kind of combination desktop collection and synchronous display method, described method, based on said system, said method comprising the steps of:
At collection terminal:
S1: configure each collection terminal, makes each collection terminal be operated at the same time under coordinate, adopts mode during NTP couple that the system clock of each collection terminal is consistent; After being configured, obtaining a composite signal source configuration, at least comprise following configuration information: which collection terminal be made up of; The region of the DVI picture that each collection terminal gathers in combination desktop.
S2:8 collection terminal is according to each frame of the 8 road DVI pictures of the DVI0 ~ DVI7 of field sync signal difference Real-time Collection many video cards business PC output of the DVI picture of its correspondence, and in the present embodiment, collection terminal gathers 60 frame pictures each second.
S3: at each road DVI picture, the time that the field sync signal timestamp pts of each frame being set to this frame occurs, a field sync signal indicates the beginning of a frame picture, to each road DVI picture coding output code flow.
At display end:
S4: control thread creation 8 drawing areas, all unique corresponding display thread of each drawing area, represent that the signal of this display thread will be shown to this region, the drawing area created in the present embodiment as shown in Figure 3.
Control thread creation 8 collecting threads, each collecting thread is a unique corresponding collection terminal respectively, to each collection terminal continuous collecting bit stream data.
Control thread creation 8 display thread, each display thread is a unique corresponding drawing area respectively, draws the image of the collection terminal of its correspondence to this drawing area.
S5: after each collecting thread receives the bit stream data after collection, code stream is decoded, obtains picture data and the timestamp pts of each frame in the DVI picture of each road, in order to the shake that circumvent network brings, collecting thread, to the frame of each road DVI picture buffer memory preset number, forms multichannel buffer queue.
When network quality is good, the number of the frame of buffer memory is few, and during network quality difference, the number of the frame of buffer memory is many, and the present embodiment collecting thread buffer memory 5 frame, buffer queue as shown in Figure 4.
S6: when each collecting thread is all cached to 5 frame, choose the first frame of a first frame time stamp road buffer queue the latest as initial display frame, the timestamp recording this frame is PST0, deletes the frame of timestamp before PST0 in buffer queue.
S7: initial display frame is shown in the drawing area of the combination desktop of its correspondence by display thread, system time when recording the display of this frame is T0, is then deleted from head of the queue by this frame.
In this example, as shown in Figure 5, head of the queue frame the latest appears at DVI2, so head of the queue frame the 0th frame of DVI2 will as initial display frame, its Presentation Time Stamp is designated as PTS0, and the system time during display of this frame is designated as T0, and after deleting initial display frame, each buffer queue as shown in Figure 6.
S6: control thread and PTS0 and T0 of initial display frame is notified each display thread, according to present system time and timestamp, each road buffer queue judges that its first frame is the need of display, if do not needed display, then waits for; As needs display, then in the corresponding region of combination desktop, this frame is shown, then this frame is deleted from head of the queue.
Judge the first frame of each road buffer queue the need of display concrete grammar as: set present system time as Tn, the Presentation Time Stamp of first frame is PTSn, as Tn-T0 >=PTSn-PST0, then changing frame needs display, otherwise this frame does not temporarily need display.
S7: repeat step S6, each frame of each road DVI picture is shown in the drawing area of combination desktop of its correspondence by display thread, thus the combination desktop signals verily reduced.
Splice the coded picture of a generation resolution super large like that compared to conventional method, the present embodiment breaks the whole up into parts dexterously, is gathered by each road DVI picture, in the reduction of display end former state, finally achieves the simultaneous display of combination desktop in collection terminal former state.
The corresponding same or analogous parts of same or analogous label;
The term describing position relationship in accompanying drawing, only for exemplary illustration, can not be interpreted as the restriction to this patent;
Obviously, the above embodiment of the present invention is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all execution modes.All any amendments done within the spirit and principles in the present invention, equivalent to replace and improvement etc., within the protection range that all should be included in the claims in the present invention.
Claims (6)
1. combine desktop collection and a synchronous display method, described method is applied to desktop collection and synchronous display system, and described system comprises collection terminal and display end, it is characterized in that, said method comprising the steps of:
At collection terminal:
S1: gather multichannel DVI picture, a region of every road DVI picture correspondence combination desktop;
S2: at each road DVI picture, the time that the field sync signal timestamp pts of each frame being set to this frame occurs, to each road DVI picture coding output code flow;
At display end:
S3: decode to code stream, obtains picture data and the timestamp pts of each frame in the DVI picture of each road, to the frame of each road DVI picture buffer memory preset number, forms multichannel buffer queue;
S4: choose the first frame of a first frame time stamp road buffer queue the latest as initial display frame, the timestamp recording this frame is PST0, deletes the frame of timestamp before PST0 in buffer queue;
S5: initial display frame is shown in the corresponding region of combination desktop, system time when recording the display of this frame is T0, is then deleted from head of the queue by this frame;
S6: according to present system time and timestamp, each road buffer queue judges that its first frame is the need of display, if do not needed display, then waits for; As needs display, then in the corresponding region of combination desktop, this frame is shown, then this frame is deleted from head of the queue;
S7: repeat step S6, shows each road DVI picture at combination desktop.
2. combination desktop according to claim 1 gathers and synchronous display method, it is characterized in that, described method also comprises: in step S3, the number of the frame of each road DVI picture buffer memory is set according to network quality, when network quality is good, the number of the frame of buffer memory is few, and during network quality difference, the number of the frame of buffer memory is many.
3. combination desktop according to claim 1 gathers and synchronous display method, it is characterized in that, described method also comprises: in step S6, judge the first frame of each road buffer queue the need of display concrete grammar as: set present system time as Tn, the Presentation Time Stamp of first frame is PTSn, as Tn-T0 >=PTSn-PST0, then this frame needs display, otherwise this frame does not temporarily need display.
4. a combination desktop collection and synchronous display system, it is characterized in that, described system comprises display end and multiple collection terminal, each collection terminal gathers a road DVI picture, described display end comprises control thread and multiple collecting thread and shows thread, each collecting thread and display thread correspondence one road DVI picture;
Collection terminal: for gathering DVI picture, the time that the field sync signal timestamp pts of each frame being set to this frame occurs, to each road DVI picture coding output code flow;
Control thread: for creating and control collecting thread and display thread;
Collecting thread: for decoding to code stream, obtains picture data and the timestamp pts of each frame in the DVI picture of each road, to the frame of each road DVI picture buffer memory preset number, forms multichannel buffer queue;
Display thread: for showing at the first frame of corresponding region to each road buffer queue of combination desktop according to present system time and timestamp, then this frame is deleted from head of the queue.
5. combination desktop according to claim 4 gathers and synchronous display system, it is characterized in that, described collecting thread and display thread are by controlling thread creation.
6. combination desktop according to claim 4 gathers and synchronous display system, it is characterized in that, described control thread creation corresponding drawing area unique with each road DVI picture, each road DVI picture is shown to the drawing area of its correspondence by each display thread respectively.
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Application publication date: 20150506 |