CN112333407A - Video display capability compatibility method, port switching method and video matrix - Google Patents
Video display capability compatibility method, port switching method and video matrix Download PDFInfo
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- CN112333407A CN112333407A CN202110005395.4A CN202110005395A CN112333407A CN 112333407 A CN112333407 A CN 112333407A CN 202110005395 A CN202110005395 A CN 202110005395A CN 112333407 A CN112333407 A CN 112333407A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
- H04N5/268—Signal distribution or switching
Abstract
The invention discloses a method for compatible video display capacity, correspondingly, a method for switching ports of a video matrix and the video matrix are also disclosed, a virtual capacity parameter value is generated according to at least one capacity parameter value of display equipment and the video matrix, a video source sends a video stream according to the virtual capacity parameter value, the problem of poor compatibility caused by the fact that the reasons of video matrix capacity, complicated writing of capacity parameters, high professional requirement and the like are not considered in the prior art is solved, the compatibility among the video source, the display equipment and the video matrix in the transmission process of the video stream is improved, and user experience is improved.
Description
Technical Field
The invention relates to the field of video matrix port switching, in particular to a video display capacity compatible method, a video matrix port switching method and a corresponding video matrix.
Background
The video matrix is mainly used for distributing one or more paths of video streams to one or more display devices for display, and since the display devices can only stably display the video streams meeting the self acceptance capability, the video sources need to fully consider the acceptance capability of each display device connected with the video sources when outputting the video streams.
The existing video matrix generally has the condition that video streams accessed by an input port cannot be stably displayed on display equipment accessed by an output port, when the output port of the video matrix is accessed to a plurality of display equipment with different processing capabilities, the compatibility problem is particularly prominent, and the user experience is greatly reduced.
Extended Display Identification Data (EDID), which is a standard related to display identification data established by Video Electronics Standards Association (VESA) when a DDC display data channel communication protocol is established, contains parameters related to a display and its performance, including vendor information, a maximum image size, a color setting, a vendor preset, a limit of a frequency range, a character string of a display name and a serial number, and the like.
Conventionally, the EDID of a video matrix is generally set according to the EDID of a display device, and includes: the EDID of the display device is copied and written into the input port of the video matrix through setting of the dial switch, or field setting through an external interface, or through the output port of the video matrix. Common setting of dial-up switches, e.g. pre-storing common N2The EDIDs are set by selecting one of the EDIDs through the N dial switches, if the EDIDs are not suitable, the setting is very limited, the suitable EDIDs can be found only by trying for many times, and if the display equipment connected with the output port is replaced, the setting needs to be carried out again, and the problem that the EDIDs cannot be compatible can be faced through the setting of the dial switches aiming at a plurality of display equipment with large performance difference; the method of setting on site through the external interface is too professional and can be completed by professional staff; the method of copying from the output port can only adapt to the scene of one input and one output, and has no effect on one input and multiple output, and the performance of the video matrix is not considered.
Disclosure of Invention
In view of the above, in order to solve the problems in the prior art, the present invention provides a method for video display capability compatibility, which is applied to a video matrix, the method comprising the following steps:
acquiring port matching conditions of an input port and an output port of the video matrix to obtain a port matching combination, wherein the port matching combination comprises one input port and at least one output port;
acquiring at least one capability parameter value of display equipment connected with each output port in the port matching combination and a corresponding capability parameter value of the video matrix;
generating at least one virtual capability parameter value according to at least one capability parameter value of the display device and a corresponding capability parameter value of the video matrix;
and the video source connected with the input port outputs a video stream according to the at least one virtual capacity parameter value.
Wherein the at least one capability parameter value is an EDID structure, the data blocks in the EDID structure comprise a first hierarchy data block and a second hierarchy data block, and the first hierarchy data block comprises a parameter capable of characterizing the display capability of the device.
Generating a virtual capacity parameter value of the EDID structure, comprising the following steps:
and processing the display equipment and the first-level data block of the video matrix according to a preset specific processing mode to obtain a virtual capacity parameter value of the first-level data block.
As an embodiment, the first layer data block includes a 72-byte description block, and obtaining a virtual capability parameter value of the 72-byte description block includes the following steps:
acquiring a pixel clock value of the display device according to a 72-byte description block of the display device, acquiring a pixel clock value of the video matrix according to the 72-byte description block of the video matrix, and taking the minimum value of the pixel clock values of the display device and the video matrix as a virtual pixel clock value;
pre-storing detailed time sequence description blocks corresponding to pixel clock values of a plurality of video formats in a sequence from high to low as alternative detailed time sequence description blocks;
and selecting the alternative detailed timing description block corresponding to the pixel clock value closest to the virtual pixel clock value and the adjacent alternative detailed timing description blocks thereof to be stored in the first two 18 bytes of the virtual capacity parameter value of the 72-byte description block from high to low.
In one embodiment, the first hierarchical data block includes YCBCR4:2:0 capability mapping data blocks and video data blocks, obtaining the YCBCRA 4:2:0 capability mapping data block, comprising the steps of:
according to said YCBCR4:2:0 capability mapping data block and video data block corresponding relation, respectively obtaining the display device and the first video format set supported by the video matrix;
taking intersection of the first video format set and obtaining the YCBCRMapping the corresponding relation between the data block and the video data block by the 4:2:0 capability to obtain the YCBCRThe 4:2:0 capability maps virtual capability parameter values for the data blocks.
In one embodiment, the first hierarchical data block includes YCBCRA 4:2:0 video data block and a video data block, the YC being obtainedBCRA virtual capability parameter value for a 4:2:0 block of video data, comprising the steps of:
according to said YCBCRThe corresponding relation between the video data block and the video data block of 4:2:0 respectively obtains the display equipment and the video matrix which only supports YCBCRA second set of video formats in a 4:2:0 sampling mode;
merging the second video set according to the YCBCRObtaining the YC according to the corresponding relation of the 4:2:0 video data block and the video data blockBCRA virtual capability parameter value for a 4:2:0 block of video data.
Further, generating a virtual capability parameter value of the EDID structure, further comprising the steps of:
selecting a lowest value of the display device and a second-level block of data of the video matrix or a second-level block of data of the video matrix as a virtual capability parameter value of the second-level block of data;
and storing the virtual capacity parameter value of the first-level data block and the virtual capacity parameter value of the second-level data block according to the EDID structure to obtain the virtual capacity parameter value of the EDID structure.
Correspondingly, as an implementation manner, the port switching method of the video matrix in the invention includes a step of monitoring the matching condition of the input port and the output port of the video matrix, and if the monitored condition changes, the video stream is sent by adopting the video display capability compatible method.
Further, the method also comprises a step of monitoring the condition of the display equipment connected with the output port of the video matrix, and if the display equipment connected with a certain output port in the port matching combination is monitored to be changed, the corresponding capability parameter value of the display equipment connected with the certain output port is updated.
Accordingly, the video matrix in the present invention includes: the input port used for connecting the video source and being used for connecting display device output port still includes:
the port matching monitoring module is used for sending a port matching combination change instruction when the matching relation between the input port and the output port is monitored to be changed;
the output port monitoring module is used for sending an output equipment updating instruction when monitoring that the access condition of the display equipment at one output port changes;
the storage module stores an operation instruction and a virtual capacity parameter value which can be executed by the control module;
the control module executes the operation instruction according to the port matching combination change instruction and the output equipment updating instruction, and realizes that the video port switching method controls the transmission of video streams;
and the input port notification module is used for notifying the video source to read the updated virtual capacity parameter value again according to the control of the control module when the virtual capacity parameter value changes.
Compared with the prior art, the invention has the following advantages:
the video display capability compatibility method generates the virtual capability parameter value according to at least one capability parameter value of the display equipment and the video matrix, and the video source sends the video stream according to the virtual capability parameter value, thereby solving the problem that the display equipment can not display the video stream because the capability of the video matrix is not considered in the prior art; the data in the EDID structure is further classified, parameters capable of representing display capacity are classified into first-level data blocks, and the first-level data blocks are specially processed, so that the problem of poor compatibility caused by the reasons that capacity parameters are written in complicatedly, the professional requirement is high and the like in the prior art is solved; according to the video port switching method and the corresponding video matrix, when the input port matching relation and the output port matching relation and the display equipment connected with the port are changed, the virtual capacity parameter value is regenerated, so that a video source can read the virtual capacity parameter to adjust the sent video stream immediately according to the change of the output end, the compatibility among the video source, the display equipment and the video matrix in the transmission process of the video stream is improved, and the user experience is improved.
Drawings
FIG. 1 is a schematic diagram of an application of a video matrix in the present invention;
FIG. 2 is a flow chart of a video display capability compatibility method according to the present invention;
FIG. 3 is a flowchart illustrating the process of obtaining a virtual capability parameter value according to the present invention when EDID is used as the capability parameter value;
FIG. 4 is a flow chart of a port switching method of a video matrix according to the present invention;
fig. 5 is a block diagram of a video matrix in the present invention.
Detailed Description
The present invention will be further described with reference to the following examples.
In FIG. 1, the video matrix 100 has n (n ≧ 1) input ports, P respectivelyi1、Pi2、Pi3 ……PinHas m (m is more than or equal to 1) output ports, which are respectively Po1、Po2、Po3 ……Pom. Video source 200 may be connected to any of video matrices 100The input port and the display device 300 can be connected to any output port of the video matrix, and when the input port and the display device are used, the matching relationship between the input port and the output port can be set or modified through keys arranged on the video matrix 100, a computer interaction page or application software installed on an intelligent terminal. Specifically, the video source 200 in fig. 1 is connected to the input port PijThe input port and the output port P at a certain timeo1、Po2、Po3 ……PokMatching, i.e. the video matrix 100 passing through the input port PijReceives a video stream of the video source 200 and passes through the output port Po1、Po2、Po3 ……PokTo the respective display devices 300.
The interfaces of the video matrix 100 may be DVI, VGA, HDMI, etc., all of which support the EDID specification, and some of which also support the High Bandwidth Digital Content Protection specification (HDCP).
In order to make the video stream output by the video source 200 compatible with the display capabilities of the video matrix 100 and the display devices 300, as shown in fig. 2, the method for making the video display capability compatible with the video matrix 100 according to the present invention comprises the following steps:
(1) and acquiring the port matching conditions of the input port and the output port of the video matrix to obtain a port matching combination.
Specifically, with reference to fig. 1, the input port P is acquiredijAnd an output port Po1、Po2、Po3 ……PokMatch, then input port PijAnd an output port Po1、Po2、Po3 ……PokA port matching combination is formed, in which there is one input port and at least one output port, the video matrix 100 in fig. 1 supports a plurality of port matching combinations, and at any time, there is no different output port between any two of the plurality of port matching combinations.
(2) And for any port matching combination, acquiring at least one capability parameter value of the display equipment connected with each output port in the port matching combination and the corresponding capability parameter value of the video matrix.
Selecting at least one capability parameter value according to the interface type of the video matrix, for example: if the interface type is HDMI, one or both of EDID and HDCP may be selected as the capability parameter value.
Specifically, referring to fig. 1, the EDID is taken as a capability parameter value to obtain the output port P in the port matching combinationo1、Po2、Po3 ……PokEDID of the connected display devices 300, and EDID of the video matrix 100.
(3) And generating at least one virtual capability parameter value according to the at least one capability parameter value of all the display devices and the corresponding capability parameter value of the video matrix.
(4) And the video source connected with the input port outputs a video stream according to the at least one virtual capacity parameter value.
Specifically, referring to fig. 1, when EDID is used as the capability parameter value, the capability parameter value is outputted to the output port Po1、Po2、Po3 ……PokThe EDID structures of the connected display devices 300 and video matrix 100 are analyzed to generate a new EDID as a virtual capability reference value EDIDijInput port P in matching combination with the portijConnected video source according to the virtual EDIDijAnd outputting the video stream.
According to the protocol, the data blocks in the EDID structure can be divided into a first-level data block and a second-level data block, and the first-level data block stores parameters capable of representing the display capability of the equipment.
For example, the EDID structures each include a VESA master block (Video Electronics Standards Association) in which a 72-Byte description block (18 Bytes Descriptions, 72 Bytes) is stored, which is stored in a continuous Byte form in the EDID structure. There are four 18-byte small blocks in the 72-byte Description block, one Detailed Timing Description block (Detailed Timing Description # 1) is stored in the first 18-byte small block, the contents stored in the following three 18-byte small blocks adjacent to the small block are not fixed, and the Detailed Timing Description block (Detailed Timing Description #2, #3, # 4) or the display Description block (Monitor Description) has a plurality of data types such as a display Range limit block (Monitor Range limit), a vendor identification block, and the like, and each type of data is 18 bytes. The display range limiting block stores pixel clock values, if the display range limiting block exists, the pixel clock values can be directly extracted, and if the display range limiting block does not exist, the pixel clock values can be derived through the detailed time sequence description block.
For example, some EDID structures include a CEA extension Block in addition to the VESA main Block, and the CEA extension Block (Consumer Electronics Association) stores Video Data Blocks (VDB) and YCBCR4:2:0 Video Data Block (Y420 VDB), YCBCR4:2:0 Capability Map Data Block (CMDB). Video data block, YCBCR4:2:0 video data block, YCBCRThe data stored in the 4:2:0 capability map data block characterizes the support of the display device for each video format. YCBCRYC-only support is stored in a 4:2:0 video data blockBCRVideo format of 4:2:0 sampling mode; video data block with stored YC support in VIC listBCR4:2:0 sampling mode, and also support RGB, YCBCR4:4:4 or YCBCRVideo formats for 4:2:2 sampling mode, for example: 640x480p, 720x480p, 1280x720p, 1920x1080i, etc.; YCBCR4:2:0 capability mapping data block to support YC in video data blockBCRThe video format of the 4:2:0 sampling mode is marked.
The above 72-byte description block, video data block, YCBCR4:2:0 video data block and YCBCRThe 4:2:0 capability map data blocks all belong to a first level data block.
And the Data blocks such as the Established timing Block (Established timing blocks) Data Block, the Vendor and Product ID Block (Vendor & Product ID Block) in the VESA main Block, and the Audio Data Block (Audio Data Block) and the speaker configuration Data Block (Audio Data Block) in the CEA extension Block have low correlation with the device display capability, and belong to a second hierarchy Data Block.
As shown in fig. 3, with EDID as a capability parameter value, step (3) in fig. 2 may further include the following steps:
(31) and processing the first-level data blocks of each display device and the video matrix according to a preset specific processing mode to obtain the virtual capacity parameter value of the first-level data block.
Specifically, referring to fig. 1, a first hierarchy data block is extracted from the EDID of each display device 300, which is in turn phio1，φo2，φo3，……，φokExtracting the corresponding first-level data block phi from the EDID of the video matrix 1000(ii) a According to such a set of first-level data blocks [ phi ]0，φo1，φo2，φo3，……，φokGenerate a virtual capability parameter value phi for the corresponding first-tier data block.
(32) Selecting the lowest value of the second-level data blocks of the respective display devices and video matrices or the second-level data blocks of the video matrices as the virtual capability parameter value of the second-level data blocks.
Specifically, for a second-level data block capable of performing capability value sorting, such as a given time sequence block, an audio data block, a speaker configuration data block, and the like, the lowest value of the corresponding data block in each display device and video matrix is selected, and for such data blocks which identify device identity information, such as manufacturer and product ID blocks, and the like, the data of the video matrix is directly filled in the virtual capability parameter value.
(33) And storing the virtual capacity parameter value of the first-level data block and the virtual capacity parameter value of the second-level data block according to the EDID structure to obtain the virtual capacity parameter value of the EDID structure, namely the virtual EDID.
In one embodiment, if the first-level data block includes a description block of 72 bytes, step (31) in fig. 3 includes the following steps:
(311) and acquiring the pixel clock value of each display device according to the 72-byte description block of each display device, acquiring the pixel clock value of the video matrix according to the 72-byte description block of the video matrix, and taking the minimum value of the pixel clock values of each display device and the video matrix as a virtual pixel clock value.
Specifically, if a display description block exists in the EDID of a certain display device, the pixel clock value is directly extracted from the display range limiting block, and if no display description block exists, the pixel clock value is derived through the detailed timing description block.
(312) And storing detailed time sequence description blocks corresponding to pixel clock values of a plurality of video formats in a high-to-low order in advance as alternative detailed time sequence description blocks.
Specifically, the pre-stored video formats may be some common video formats, including but not limited to 600M, 300M, 150M, and 75M, where each video format corresponds to one pixel clock and further corresponds to one detailed time sequence description block, and the detailed time sequence description blocks corresponding to the four video formats are stored in order from high to low.
(313) And selecting the alternative detailed timing description block corresponding to the pixel clock value closest to the virtual pixel clock value and the adjacent alternative detailed timing description blocks thereof to be stored in the first two small blocks of 18 bytes of the 72-byte description block from high to low.
(314) The display range limit block is set according to the virtual pixel clock value and stored in the third 18-byte tile of the 72-byte description block.
(315) And storing the vendor identity identification block in the fourth 18-byte small block of the 72-byte description block to finally obtain the virtual capacity parameter value of the 72-byte description block.
Specifically, if the virtual pixel clock obtained in the step (312) is closest to the pixel clock corresponding to the 300M video format, the candidate detailed timing description blocks corresponding to 300M and 150M are selected, the first two 18 bytes in the 72-byte description block are sequentially stored according to the EDID structure, the display range limitation block and the vendor identity block are stored in the last two 18 bytes in the 72-byte description block, and finally the obtained four 18-byte data blocks are the virtual capacity parameter values of the 72-byte description block.
As another implementation, the first level data block includes YCBCR4:2:0 capability maps data blocks and video data blocks, step (31) in fig. 3 comprises the steps of:
according to said YCBCR4:2:0 capability mapping data block and video data corresponding relation, respectively obtaining the display device and the first video format set supported by the video matrix;
taking intersection of the first video format set and obtaining the YCBCRMapping the corresponding relation between the data block and the video data by the 4:2:0 capability to obtain the virtual YCBCRThe 4:2:0 capability maps data blocks.
Specifically, if there is an output port P in a certain port matching combinationo1Output port Po2According to YCBCR4:2:0 capability mapping data block and video data block parsing output port Po1Output port P supporting multiple sampling modes of 640x480P, 720x480P, 1280x720P video formatso2Supporting multiple sampling modes of 720x480p, 1280x720p and 1920x1080i video formats, the virtual YC is obtainedBCRThe two formats 720x480p and 1280x720p are identified in the 4:2:0 capability mapping data block, i.e. the video source can select YC when outputting the video stream of the two video formatsBCR4:2:0 sampling mode, other sampling modes may also be selected.
In one embodiment, the first hierarchical data block includes YCBCR4:2:0 video data blocks and video data blocks, said step (31) comprising the steps of:
according to said YCBCRThe corresponding relation between the video data block and the video data block of 4:2:0 respectively obtains the display equipment and the video matrix which only supports YCBCRA second set of video formats in a 4:2:0 sampling mode;
merging the second video set according to the YCBCRObtaining YC by corresponding relation between 4:2:0 video data block and video data blockBCRA virtual capability parameter value for a 4:2:0 block of video data.
Specifically, if there is an output port P in a certain port matching combinationo1Output port Po2According to YCBCR4:2:0 video data block and video data block parsing output port Po1Supporting 640x480p, 720x480p video formats only YCBCR4:2:0 sampling mode, output port Po2Support 720x480p, 1280x720p YC onlyBCR4:2:0 sampling mode, then virtual YCBCRIdentification of three formats of 640x480p, 720x480p and 1280x720p in 4:2:0 video data block, namely, the video source can only select YC when outputting video streams of the three video formatsBCR4:2:0 sampling pattern.
The first hierarchy data block in step (31) in fig. 3 may include a pixel clock, YCBCR4:2:0 capability mapping data block and video data block, YCBCROne or more than two of the 4:2:0 video data blocks and the video data blocks, and the more types of the selected first-level data blocks, the higher the overall compatibility of the system. Of course, the first hierarchy data block may also be selected from other data blocks in the EDID structure that can characterize the display capability of the device, such as: the technical specifications include Consumer Electronics Control (CEC) and State and Control Data Channel (SCDC), and parameters capable of representing the display capability of the device are set in the specifications.
As an embodiment, as shown in fig. 4, the method for switching ports of a video matrix in the present invention includes the following steps:
(a) monitoring the matching condition of an input port and an output port of a video matrix, if the matching condition changes, sequentially executing the steps (b) to (e), and if the matching condition does not change, executing the step (f);
specifically, the matching condition changes, including that in the video matrix initialization stage, the matching relationship between the input port and the output port is set through keys on the video matrix, a computer interaction page or application software installed on the intelligent terminal; and in the use process of the video matrix, modifying the matching relation between the input port and the output port through keys on the video matrix, a computer interaction page or application software installed on the intelligent terminal.
(b) Acquiring port matching conditions of an input port and an output port of the video matrix to obtain a port matching combination;
(c) for any port matching combination, acquiring at least one capability parameter value of display equipment connected with each output port in the port matching combination and a corresponding capability parameter value of the video matrix;
(d) generating at least one virtual capacity parameter value according to at least one capacity parameter value of all display devices and the corresponding capacity parameter value of the video matrix;
(e) the video source connected with the input port outputs a video stream according to the at least one virtual capacity parameter value;
(f) monitoring the connection condition of the display equipment connected with the output ports in a certain matching combination, and if the connection condition of the equipment connected with a certain output port changes, sequentially executing the step (h), the step (d) and the step (e); otherwise, executing step (e);
(h) and acquiring the corresponding capability parameter value of the display device connected with the corresponding output port.
Specifically, in the step (a) and the step (f), the matching condition of the input port and the output port and the condition of the display device connected to the output port may be respectively monitored by a periodic cycle monitoring method, or the determination may be performed after receiving the update instruction. The port matching combination, the capability parameter value and the generated virtual capability parameter value respectively acquired in the above steps (b) to (d) may be stored in a register or other memory, so as to facilitate subsequent data processing. In this embodiment, the video source connected to the input port is changed without affecting the related process, and only the newly accessed video source needs to read the virtual capability parameter value in the port matching combination corresponding to the input port.
In this embodiment, steps (b) to (e) are the same as steps (1) to (4) included in the video display capability compatibility method shown in fig. 2, and the specific embodiment thereof is the same as the content corresponding to the corresponding steps in the above embodiment, and are not described again.
As an embodiment, as shown in fig. 5, a video matrix 100 capable of implementing the video port switching method includes an output port for connecting to a display device and an input port for connecting to a video source, and further includes:
the port matching monitoring module is used for sending a port matching combination change instruction when the change of the matching relation between the input port and the output port is monitored;
the output port monitoring module is used for sending an output device updating instruction when monitoring that the access condition of the display device at one output port changes;
the storage module is used for storing an operation instruction which can be executed by the control module and the generated virtual capacity parameter value;
the control module executes an operation instruction in the storage module according to the port matching combination change instruction and the output device update instruction, so as to realize that the video port switching method shown in fig. 4 controls the sending of the video stream;
and the input port notification module is used for notifying the video source to read a new value under the control of the control module when the virtual capacity parameter value changes.
Specifically, for a certain port matching combination, if the input and output matching relationship in the combination changes, or if the display device connected to a certain output port changes, the virtual capability parameter value will be regenerated, and for a video source connected to the video matrix input port, it is equivalent to that the virtual display port formed by the video matrix and the display device changes, and the virtual capability parameter value needs to be read again. For the interfaces such as HDMI, DVI, VGA, etc., since these interfaces all support the EDID specification, the above notification can be realized by the HPD (hot plug) signal.
Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the details of the embodiments, and various equivalent modifications can be made within the technical spirit of the present invention, and the scope of the present invention is also within the scope of the present invention.
Claims (10)
1. A video display capability compatible method applied to a video matrix, the method comprising the steps of:
acquiring port matching conditions of an input port and an output port of the video matrix to obtain a port matching combination, wherein the port matching combination comprises one input port and at least one output port;
acquiring at least one capability parameter value of display equipment connected with each output port in the port matching combination and a corresponding capability parameter value of the video matrix;
generating at least one virtual capability parameter value according to at least one capability parameter value of the display device and a corresponding capability parameter value of the video matrix;
and the video source connected with the input port outputs a video stream according to the at least one virtual capacity parameter value.
2. The video display capability compatibility method according to claim 1, wherein said at least one capability parameter value is an EDID structure, wherein the data blocks in said EDID structure comprise a first hierarchy data block and a second hierarchy data block, and wherein said first hierarchy data block comprises a parameter capable of characterizing the display capability of the device.
3. The video display capability compatible method according to claim 2, wherein generating the virtual capability parameter value of the EDID structure comprises the steps of:
and processing the display equipment and the first-level data block of the video matrix according to a preset specific processing mode to obtain a virtual capacity parameter value of the first-level data block.
4. The video display capability compatible method according to claim 3, wherein the first layer data block includes a 72-byte description block, and the virtual capability parameter value of the 72-byte description block is obtained, comprising the steps of:
acquiring a pixel clock value of the display device according to a 72-byte description block of the display device, acquiring a pixel clock value of the video matrix according to the 72-byte description block of the video matrix, and taking the minimum value of the pixel clock values of the display device and the video matrix as a virtual pixel clock value;
pre-storing detailed time sequence description blocks corresponding to pixel clock values of a plurality of video formats in a sequence from high to low as alternative detailed time sequence description blocks;
and selecting the alternative detailed timing description block corresponding to the pixel clock value closest to the virtual pixel clock value and the adjacent alternative detailed timing description blocks thereof to be stored in the first two 18 bytes of the virtual capacity parameter value of the 72-byte description block from high to low.
5. The video display capability compatible method of claim 3, wherein the first hierarchical data block comprises YCBCRA 4:2:0 capability mapping data block and a video data block, then acquiring the YCBCRA virtual capability parameter value of a 4:2:0 capability mapping data block, comprising the steps of:
according to said YCBCR4:2:0 capability mapping data block and video data block corresponding relation, respectively obtaining the display device and the first video format set supported by the video matrix;
taking intersection of the first video format set and obtaining the YCBCR4:2:0 capability mapping data block to video data block correspondenceRelationship to obtain said YCBCRThe 4:2:0 capability maps virtual capability parameter values for the data blocks.
6. The video display capability compatible method of claim 3, wherein the first hierarchical data block comprises YCBCR4:2:0 video data block and video data block, then acquire the YCBCRA virtual capability parameter value for a 4:2:0 block of video data, comprising the steps of:
according to said YCBCRThe corresponding relation between the video data block and the video data block of 4:2:0 respectively obtains the display equipment and the video matrix which only supports YCBCRA second set of video formats in a 4:2:0 sampling mode;
merging the second video set according to the YCBCRObtaining the YC according to the corresponding relation of the 4:2:0 video data block and the video data blockBCRA virtual capability parameter value for a 4:2:0 block of video data.
7. The video display capability compatible method according to any one of claims 3 to 6, wherein generating the virtual capability parameter value of the EDID structure further comprises the steps of:
selecting a lowest value of the display device and a second-level block of data of the video matrix or a second-level block of data of the video matrix as a virtual capability parameter value of the second-level block of data;
and storing the virtual capacity parameter value of the first-level data block and the virtual capacity parameter value of the second-level data block according to the EDID structure to obtain the virtual capacity parameter value of the EDID structure.
8. A method for switching ports of a video matrix, the method comprising the step of monitoring matching between an input port and an output port of the video matrix, and if the monitored matching changes, transmitting a video stream by using the video display capability compatible method according to any one of claims 1 to 7.
9. The method according to claim 8, further comprising the step of monitoring the status of the display devices connected to the output ports of the video matrix, and if it is monitored that the display device connected to a certain output port in the port matching combination changes, updating the corresponding capability parameter value of the display device connected to the certain output port.
10. A video matrix, comprising: input port for connecting a video source and output port for connecting a display device, wherein the video matrix further comprises:
the port matching monitoring module is used for sending a port matching combination change instruction when the matching relation between the input port and the output port is monitored to be changed;
the output port monitoring module is used for sending an output equipment updating instruction when monitoring that the access condition of the display equipment at one output port changes;
the storage module stores an operation instruction which can be executed by the control module;
a control module, executing the operation instruction according to the port matching combination change instruction and the output device update instruction, and implementing the video port switching method of claim 9 to control the transmission of video stream;
and the input port notification module is used for notifying the video source to read the updated virtual capacity parameter value again according to the control of the control module when the virtual capacity parameter value changes.
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