CN111918013B - HDMI8K100/120 video judgment and output method and device - Google Patents
HDMI8K100/120 video judgment and output method and device Download PDFInfo
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- CN111918013B CN111918013B CN202010811450.4A CN202010811450A CN111918013B CN 111918013 B CN111918013 B CN 111918013B CN 202010811450 A CN202010811450 A CN 202010811450A CN 111918013 B CN111918013 B CN 111918013B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
- H04N7/0125—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level one of the standards being a high definition standard
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- H—ELECTRICITY
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- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/015—High-definition television systems
Abstract
A method for judging and transmitting an HDMI8K100/120 video signal comprises the following steps: step 1: connecting equipment, step 2: sending +5V by the source equipment, and step 3: the display device returns to the HPD high level, step 4: reading EDID by the source equipment, and 5: the source device analyzes the EDID and matches with a preset list, and the step 6: the source device judges the capability of the display device according to the EDID, and the step 7: the source equipment sets software and hardware parameters according to the capability of the display equipment and carries out physical layer training, and the step 8: the source device transmits the video content, step 9: and decompressing and other signal processing and displaying at the display end. The invention is simple and effective in matching, judging and transmitting method of video signals, and 8K100/120DSC4:2:0 (or 4:2:2) video content is transmitted from a source end device to a specified display device through an HDMI cable through equipment matching and capability judgment, and 8K100/120 display playing is carried out.
Description
Technical Field
The invention relates to the transmission application of 8K100/120 video content between HDMI (high Definition Media interface) devices, in particular to a method for judging and outputting HDMI8K100/120 video, which ensures the matching of the transmission channel capability of the 8K100/120 video content and simultaneously minimizes the complexity of the production and the manufacture of the devices.
Background
Fig. 1 is a typical HDMI2.1 system diagram with DSC capability, which includes a transmitting device, a receiving device and a connecting line to implement the transmitting terminal function and the receiving terminal function of signals.
The processing sequence of the sending end function is as follows:
a. presetting a list, and matching display equipment in a system initialization stage;
b. a video decoder for decoding a video data stream provided by a program provider, such as: AVS 38K 100/120 video data content.
c. If the decompressed video data exceeds the physical transmission capability of the HDMI, the data needs to be sent to the VESA DSC for shallow compression. DSC compression needs to work with enablement.
d. The unencoded HDMI protocol module processes audio and video and other related signals;
e. encrypting the content;
the FRL/TMDS encoding module encodes the data according to the FRL/TMDS protocol;
serdes (seralizer & De-Serializer) encapsulated FRL/TMDS data streams;
receiving end function and processing sequence:
the EDID functional module provides display equipment capability parameters to source equipment in a system initialization stage;
unpacking the FRL/TMDS data stream by the SerDes;
the FRL/TMDS decoding module decodes the data according to the FRL/TMDS protocol;
d. decrypting the content;
e. the non-coding protocol module processes audio and video and other data;
the VESA DSC decompresses the display data, and the DSC can work selectively as required;
g. and (5) carrying out post-processing by the video processing module.
The HDMI transmitting source device and the HDMI receiving display device are linked by an HDMI cable.
FIG. 5 is Table 1: EDID data structure table as shown in fig. 5, table 1 is an example of an EDID data structure table which is used in an initialization stage in which the HDMI transmitting and receiving system starts connection in a downstream display device. The table uses 2 modules, addresses 0x00-0x7F belonging to the EDID basic module, addresses 0x80-0xFF being CTA extension modules. The first 8 bytes (address 0x00-0x07) of the basic module are fixed identification bits, and the next 10 bytes (address 0x08-0x11) are manufacturer and product information, which lists the manufacturer code number, product code, serial number, and production time in detail. 0x12-0x7D is EDID version information, along with various display parameters, properties, timing, names, and scope descriptions. 0x7E is an extended flag to indicate how many extended modules, 128 bytes each, start with 0x 80. 0xFF is a check bit.
FIG. 6 is Table 2: an example of the contents of the CTA extension module part of EDID, as shown in FIG. 6, Table 2 is an example of the contents of the CTA extension module part of EDID, and the typical CTA Data structures are listed therein, including Video Data Block (VDB), Audio Data Block (ADB), Speaker Allocation Data Block (SADB), Vendor-Specific Data Block (VSDB), Video Capability Data Block (VCDB), YCbCr4:2: 0Video Data Block (Y420 VDB), YCbCr4:2:0 Capability Map Data Block (Y420 CMDB), and the like.
Video Data Block (VDB) is a Data structure defined by cta (consumer Technology association) for recording several Video formats that a display device can support, with a Video Tag Code value of 2. The 8K100/120 tv writes the Video format numbers (VIC 200 and VIC 208) corresponding to 8K100 into a certain column of CTA Short Video Descriptor bytes (e.g., byte 2), and writes the Video format numbers (VIC 201 and VIC 209) corresponding to 8K120 into another column of CTA Short Video Descriptor bytes (e.g., byte 3). The 8K100/120 television must have the capability to handle the 4K100/120 video format, with the 4K100 video format numbers (VIC 117 and VIC 119) and the 4K120 video format numbers (VIC 118 and VIC 120) listed in the other CTA Short Descriptor bytes (say bytes 1+ L1).
YCbCr4:2: 0Video Data Block (Y420 VDB) is a Data structure defined by CTA, records Video format numbers which can only be processed by YCbCr4:2:0, and has an Extended Tag Code value of 7 and a Video Capabilities ext. Tag value of 0x 0E. If the television is only capable of processing 8K100/120 video content using YCbCr4:2:0 encoding, but can process 4K100/120 using 4:4:4 or YCbCr4:2: 2 encoding, then the video format number corresponding to 8K100/120 will be listed in Y420 VDB, but the video format number corresponding to 4K100/120 will not.
YCbCr4:2:0 Capability Map Data Block (Y420 CMDB) is a Data structure defined by CTA to claim whether the Video format listed in VDB can support YCbCr4:2:0, with an Extended Tag Code value of 7, and a Video Capabilities Ext. Tag value of 0x 0F. If YCbCr4:2:0 is available, the corresponding identification bit is 1, otherwise 0.
A Vendor-Specific Data Block (VSDB) is a special Data structure defined by CTA, whose content is self-defined by an institute with IEEE identifier (IEEE OUI), and whose Vendor-Specific Tag Code value is 3. HDMI Forum defines HF-VSDB for use by HDMI devices.
Table 2 lists only a portion of the commonly used CTA data structures.
FIG. 7 is Table 3: HF-VSDB header identification Table, as shown in FIG. 7, Table 3 is a HF-VSDB header identification Table.
FIG. 8 is Table 4: HF-VSDB load data table, as shown in fig. 8, table 4 is HF-VSDB load data, whose bytes 8-10 define the DSC decompression capability parameter.
The combination of the data structures can completely and clearly describe the capability of the display device, and is convenient for the capability matching of the upstream source device after the HDMI connection, thereby achieving the best processing and display effect.
The AVS3 has defined the 8K100/120 video format decompression coding standard in 2019, mainly using the YCbCr4:2:0 coding scheme. Other decompression standards organizations, such as HEVC, AV1, VP9, etc., are also defining 8K100/120 video format decompression coding standards, commonly using YCbCr4:2: 0.
In the television broadcasting network in China, a set top box is a relatively common home access device. Meanwhile, the set-top box is connected with a downstream television through an HDMI cable.
To send 8K100/120 video content from the content end of the broadcast television network to the television and finally present the content to the user, each node of the transmission chain needs to have 8K100/120 processing capability, such as recording and editing of program source, video compression, content distribution, network transmission, set-top box reception, video decompression, HDMI high-speed transmission from the set-top box to the television, video processing and display of the television, otherwise, final presentation of the 8K100/120 video content cannot be guaranteed.
In the prior art, the HDMI defines the high-speed transmission part of 8K100/120 too complicated, which is not beneficial to the deployment of AVS 8K ecology.
HDMI2.1 specifies that since the 8K100/120 video format exceeds the physical transmission capability of HDMI 2.148 Gbps, uncompressed raw transmission cannot be used and Display Stream Compression (DSC) must be performed to transmit from an upstream device to a downstream over an HDMI cable.
While HDMI2.1 specifies that for the 8K100/120 video format, the upstream device must have the capability of DSC4: 4:4 and DSC YCbCr4:2: 2 (if the device supports YCbCr4:2: 2). The downstream display device is not mandatory, in other words, HDMI2.1 has full specification requirements for 8K100/120 source devices, but has low requirements for downstream display devices, and 8K120 tv can refer to the lowest standard, and is considered compliant as long as it can support DSC YCbCr4:2: 0.
In practical use, not all 8K100/120 source devices need full specification, for example, AVS 38K 100/120 is usually presented in 8K100/120 YCbCr4:2:0 pixel coding after decompression, and it is reasonable to continue to maintain YCbCr4:2:0 (or upgrade to YCbCr4:2: 2) for video transmission over HDMI high-speed interface. However, in order to pass HDMI2.1 compliance verification, the device must be able to upgrade YCbCr4:2:0 to 4:4:4 before DSC4: 4:4 compression transmission. This DSC4: 4:4 capability is not needed in practical applications of video playback. According to case analysis, firstly, video content is generally not transmitted using 4:4:4 encoding; secondly, HDMI does not force 8K120 tv to have the receiving capability of 8K100/120DSC4: 4:4, and tv does not actively increase product complexity.
The high requirements of the existing HDMI for video source devices may unnecessarily increase the complexity of the system design of the AVS 38K 100/120 by 50-100%, which is expressed in various aspects of hardware, software, power consumption, etc. For example, the source end device corresponding to 8K100/120DSC4:2:0 only needs 4 parallel processing paths (each path has a 600MHz running rate) and 8 DSC slice processors in the system and software and hardware, and the corresponding FRL rate is 8 Gbps; however, the source device corresponding to 8K100/120DSC4: 4:4 requires 8 parallel processing paths (600 MHz operating rate per path), 12 DSC slice processors, and the corresponding FRL rate is 10 Gbps. Such a full specification requirement of 8K100/120DSC4: 4:4 is reasonable for high-end high-performance game devices, but the requirement for ordinary video devices is nearly harsh and does not produce benefit, which is not favorable for development of video products or cost performance optimization of such products, and is also not favorable for ecological deployment of AVS 8K, and a method for solving the problem is lacking in the industry at present. Other compression formats than AVS also present this problem above 8K ecological deployments.
In view of the above, a technology needs to be developed, which, on the premise of not excessively increasing the complexity of the AVS 38K 100/120 video system, by establishing and maintaining a device preset list and comprehensive judgment, transmits an 8K100/120 video stream from an AVS set-top box to a display device with 8K100/120 capability through an HDMI cable in a DSC4:2:0 (or 4:2:2) encoding manner, and finally displays and plays the video stream in the K100/120 video format. This technique is equally applicable to 8K100/120 video systems using other decompression standards.
Disclosure of Invention
The invention aims to disclose a method for judging and outputting an HDMI8K100/120 video, which is characterized in that under the premise of not excessively increasing the complexity of an AVS 38K 100/120 video system, an 8K100/120 video stream is transmitted from an AVS set-top box to a display device with 8K100/120 capability through an HDMI cable in a DSC4:2:0 (or 4:2:2) coding mode by establishing and maintaining a device preset list and comprehensive judgment, and finally the video stream is displayed and played in the video format of 8K 100/120. The inventive method is equally applicable to 8K100/120 video systems using other compression formats.
The invention also aims to disclose a device for judging and outputting the HDMI8K100/120 video.
The specific implementation mode of the invention is that the method for judging and outputting the HDMI8K100/120 video comprises the following steps:
the method comprises the following steps: connecting equipment;
step two: the source equipment sends out + 5V;
step three: the display device returns to the HPD high level;
step four: reading EDID by the source equipment;
step five: the source equipment analyzes the EDID and matches the EDID with a preset list;
step six: the source equipment judges the capability of the display equipment according to the EDID;
step seven: the source equipment judges and sets software and hardware parameters according to the capacity and carries out physical layer training;
step eight: the source device transmits video content;
step nine: and decompressing and other signal processing and displaying at the display end.
Further, the five-source device preliminarily analyzes the EDID content and matches with a preset list, mainly comprising manufacturer names located in EDID basic module fields 0x08-0x09, product codes located in 0x0A-0x0B, sequence numbers located in 0x0C-0x0F and production dates located in 0x10-0x11, and then performs preset list matching according to a pseudo code flow.
Further, the six-step source device continues to parse the EDID content and thereby determine the display device capability, the parsing process includes a plurality of Data structures, such as viewing a Video Data Block (VDB) Video format encoding list to know which Video formats are supported by the display device, including 8K 100/120; looking at a YCC420 Video Data Block (YCC420 VDB) list, understand which Video formats the display device supports YCbCr4:2: 0; looking at the YCC420 Capability Map Data Block (YCC420 CMDB) mapping table, the overall status of the display device supporting YCbCr4:2:0 in all video formats is known; a View of the Vendor Specific Data Block (VSDB) is presented with DSC capability parameters of the display device.
If the vendor and product information matches the pre-set list of the source device and the data structure indicates that the display device has 8K100/120DSC YCbCr4:2:0 or YCbCr4:2: 2 processing capabilities, then the source device may decide to output 8K100/120DSC4:2: 0/4:2:2 if the vendor and product information does not match the pre-set list of the source device or the data structure indicates that the display device does not have 8K100/120DSC YCbCr4:2:0 or YCbCr4:2: 2 processing capabilities, then the source device may decide to downgrade the 8K100/120, such as to reduce the resolution (such as to 4K120) or to reduce the refresh rate (such as to 8K 60).
In summary, for a video playing source device which does not need 8K100/120DSC4: 4:4 in an actual usage scenario, such as AVS 38K 100/120 player or set-top box, the present invention can ensure that 8K100/120DSC4:2:0 (or 4:2:2) video content is transmitted to a display device with matching vendor, product and processing capability through an HDMI cable to perform 8K100/120 display playing in actual usage.
The invention has the beneficial effects that:
1. the complexity of development of a source product can be effectively reduced, including the complexity of hardware, software, a system, power consumption, development period and the like.
2. The method for judging and outputting the HDMI8K100/120 video realizes the preset matching, capacity judgment and transmission of the HDMI8K100/120 video signal.
Drawings
Fig. 1 is a diagram of a typical DSC-capable HDMI2.1 system;
FIG. 2 is a detailed flow chart of the method of the present invention;
FIG. 3 is a default name sheet diagram of the method of the present invention;
FIG. 4 is a video matching flow diagram of the method of the present invention;
FIG. 5 is Table 1: an EDID data structure table;
FIG. 6 is Table 2: an example of the CTA extended module portion content of EDID;
FIG. 7 is Table 3: an HF-VSDB header identification table;
FIG. 8 is Table 4: HF-VSDB load data table.
Detailed Description
The invention is described in detail below by way of specific embodiments with reference to the accompanying drawings, in which: fig. 2 is a detailed flowchart of a method for judging and outputting an HDMI8K100/120 video according to the present invention, and as shown in the figure, the method for judging and outputting an HDMI8K100/120 video includes 9 steps, which implement how to help an HDMI source device perform preset matching and capability judgment on a display device according to the present invention.
Step one, connecting the device S1: the source equipment and the display equipment are physically linked through an HDMI cable;
step two, the source device sends out +5V S2: the source equipment sends a +5V voltage signal to the display equipment;
step three the display device returns to HPD high level S3: the display equipment starts to start after receiving the +5V signal, firstly prepares EDID content, and returns HPD high level to the source equipment after the EDID is prepared;
step four source device reads EDID S4: after receiving the HPD high-level signal, the receiving end starts to read the EDID content of the display equipment through the DDC;
step five, the source device analyzes the EDID and matches the EDID with a preset list S5: the source device parses the EDID content to understand the overall capabilities of the display device, including Vendor/product information, Video Data Block (VDB), YCC420 Video Data Block (YCC420 VDB), YCC420 Capability Map Data Block (YCC420 CMDB), Vendor Specific Data Block (VSDB), etc.
FIG. 3 is a default name sheet diagram of the method of the present invention; as shown in fig. 3, first, preset list matching is performed; the method comprises the following steps: the product information of product G1 is: manufacturer A, product code A1code, and production date A1Y; the product information of product G2 is: manufacturer A, product code A2code, and production date A2Y; the product information of product G3 is: manufacturer B, product code B1code, and production date B1Y; the product information of product G4 is: manufacturer C, product code C1code, and production date C1Y; and by analogy, the preset list comprises Gi products.
Step six, the source device judges the device capability according to the EDID S6: the source device determines that the capabilities of the display device are integrated according to the EDID, as shown in fig. 4, if the vendor/product information matches a preset list of the source device and it is confirmed that the display device has 8K100/120DSC YCbCr4:2:0 or YCbCr4:2: 2 processing capabilities, the source device may decide to output 8K100/120DSC4:2: 0/4: 2. if the vendor/product information cannot match the preset list of the source device or the display device does not have 8K100/120DSC YCbCr4:2:0 or YCbCr4:2: 2 processing capabilities, the source device needs to decide to perform degradation processing on 8K100/120, such as reducing the resolution (such as reducing to 4K120), or reducing the refresh rate (such as reducing to 8K 60).
And step seven, setting software and hardware parameters and performing physical layer training S7 by the source equipment: the source device judges and sets software and hardware parameters according to the capacity, and performs link training with the display device through the HDMI cable to confirm the physical capacity, and after the conclusion is formed, the source device completes the software and hardware setting according to the functions described in the figure 1, including receiving and decoding of compressed video, DSC compression and enabling, HDMI signal integration before encoding, content encryption, FRL or TMDS encoding, SerDes packaging and the like.
Step eight source device transmits video content S8: after the setup is ready, the source device transmits the content to the display device through the HDMI cable according to the functions described for the source device in fig. 1. For example, after the 8K 100/120500 mbps compressed code stream of the broadcast television network AVS3 is processed by the functional modules, video Content in a DSC8K 1204: 2:0 format is used, the source device uses the FRL rate of 4 channels 8Gpbs in real time to continuously and serially transmit from the HDMI output interface of the source device to the HDMI input interface of the display device at a constant speed, the throughput is 32Gbps, audio and other control data may be attached to the transmission, and the transmission Content may be encrypted by hdcp (high Definition Content protection).
Step nine, display side decompression and other signal processing and display S9: the display device processes the received video content and completes the display according to the functions described at the display side of fig. 1 after receiving the HDMI video stream. If DSC8K 100/1204: 2:0video content is received, the display equipment firstly carries out SerDes decapsulation, serial data is subjected to boundary definition and recovered to be parallel, then FRL or TMDS decoding is carried out to recover pixel byte information, HDCP encryption needs to be removed to recover HDMI signals aiming at HDCP encrypted content, then HDMI audio, video and other control data are split, and corresponding YCbCr4:2: 0DSC decompression is carried out aiming at YCbCr4:2: 0DSC compressed video. Audio, video and other signals also require post-processing, etc., including conversion from YCbCr4:2:0 encoded format to RGB 4:4:4, followed by driving and display, and the 8K120 video content is finally presented in an RGB pixel array at 8K resolution, 120Hz or higher refresh rate.
According to the complexity of different HDMI systems, the time for completing the above 9 steps is about 200ms to 2S, wherein in the step five, the source device analyzes the EDID and matches the EDID with a preset list S5, and in the step six, the source device judges the device capability according to the EDID S6 is a significant technical characteristic part of the method.
The core of the invention is that the source terminal device establishes a preset list and maintains the list for a long time, and the comprehensive capacity judgment is carried out in the EDID analysis process aiming at the display device in the preset list, so as to determine whether the source terminal device opens the 8K100/120DSC4:2: 0/4:2:2 output function or not, and whether the degradation processing is carried out on the 8K100/120 video content or not.
The upstream device needs to establish a predetermined list of 8K100/120 video formats listing downstream devices with 8K100/120DSC4:2: 2/4:2:0 capabilities, including vendor and specific product information, as shown in fig. 3. The preset list can be embedded in the video device starting software and used on the premise that 8K100/120 video content can be received.
The length of the preset list is limited because in the foreseeable future, in 8K ecological deployment, the 8K100/120 standard belongs to the highest end, and there are very few display devices with 8K100/120DSC4:2: 2/4:2:0 capability, and the display devices are generally the highest specification flagship products of television manufacturers. This pre-set list requires long-term maintenance, requires regular addition (or deletion) of manufacturer and product information that meets (or does not meet) expectations, but is relatively easy to maintain, is purely software in nature, and is fully backward compatible when upgraded.
Fig. 4 is a video matching flow chart of the method of the present invention, and as shown in fig. 4, the steps of the video matching flow chart are:
step one, connecting the device S1: it is determined whether 8K100/120 video content is received. If yes, go to step two S2; otherwise, go to step six S6.
Step two, the source device sends out +5V S2: carrying out EDID preset list judgment: and confirming whether the downstream manufacturer/product code can be successfully matched with an item in the preset list. If yes, go to step three S3; otherwise, go to step six S6.
Step three the display device returns to HPD high level S3: and (4) carrying out EDID capability judgment:
is 8K100/120 and DSC1.2a supported simultaneously?
Whether YCbCr4:2: 0(4:2: 2)?
Is the number of DSC slice processors greater than or equal to 8?
Is the DSC FRL rate greater than or equal to 8Gbps (10 Gbps)?
If all confirm, go to step four S4; otherwise, go to step six S6.
Step four source device reads EDID S4: perform other EDID parsing including video, audio, speakers, vendor specific data structures, etc., and then proceed to step five S5;
step five, the source device analyzes the EDID and matches the EDID with a preset list S5: source device configuration is performed and 8K100/120DSC4:2: 0(4:2:2) content is output.
Step six, the source device judges the device capability according to the EDID S6: find below 8K100/120 supportable formats and other EDID resolutions, similar to step four S4.
And step seven, setting software and hardware parameters and performing physical layer training S7 by the source equipment: source device configuration is performed and the following content of 8K100/120 is output, similarly to step five S5.
Through the seven steps, if the manufacturer/product information of the downstream display device is completely matched with a certain product model in the preset list, and the HF-SCDB load data and the related data structure indicate that the downstream display device has the processing capability of 8K100/120DSC4:2:0, the upstream source device can configure and start the output of 8K100/120DSC4:2:0 after training through the link. Similarly, if the HF-SCDB load data and associated data structures collectively indicate that the display device is 8K100/120DSC4:2: 2 capable of processing, then after training through the link, the upstream source device may configure and initiate an output of 8K100/120DSC4:2: 2.
Example 1: successfully matching with the preset list, and playing the 8K100/120 end-to-end video
Suppose that the AVS set-top box receives the AVS3 code stream and decodes the 8K 100/1204: 2:0video content, suppose that there are 2 items in the preset list of the set-top box:
1. manufacturer: three stars; the product model is as follows: QTV 80E; date of birth: 2020;
2. manufacturer: sharp; the product model is as follows: LTV 75W; date of birth: 2020;
and after the downstream display equipment is in butt joint with the set-top box, the set-top box performs preset list matching on the display equipment. If the EDID of the display device indicates that the device was samsung QTV80E, produced in 2020, and successfully matched the first entry of the pre-set list, the 8K100/120 capability check is continued.
If EDID shows that the device supports 8K100/120, DSC1.2a, YCbCr4:2:0, DSC4:2:0 and 8 slice processors through data structures such as VDB, VCDB, Y420 VDB, Y420 CMDB and VSDB, and DSC FRL supports 8Gps rate, the device is determined to have 8K100/120DSC4:2:0 capability.
Other capability resolutions, including video, audio, speaker, etc., are then performed on the display device, along with link layer physical training to further determine the overall capabilities of the display device.
After determining that the cable and display device are capable of receiving and processing 8K100/120 video content and have the associated capabilities, the source device configures the associated functional module and outputs 8K100/120DSC4:2: 0.
Example 2: the video content of 8K100/120 can not be matched with the preset list and is played in a degraded mode
Suppose that the AVS set-top box receives the AVS3 code stream and decodes the 8K 100/1204: 2:0video content, suppose that there are 2 items in the preset list of the set-top box:
1. manufacturer: three stars; the product model is as follows: QTV 80E; date of birth: 2020;
2. manufacturer: sharp; the product model is as follows: LTV 75W; date of birth: 2020;
and after the downstream display equipment is in butt joint with the set-top box, the set-top box performs preset list matching on the display equipment. If the EDID of the display device indicates that the device is the Astro test device M41H produced in 2020 and cannot match any of the predetermined lists, the performance of 8K100/120 is abandoned and instead the performance judgment below 8K100/120 is performed.
If EDID shows that the device is below 8K100/120, preferentially supports 8K50/60, supports DSC1.2a, supports YCbCr4:2: 2, does not support DSC4:2:0, is provided with 12 DSC sheet processors, and can use 10Gbps rate through data structures such as VDB, VCDB, Y420 VDB, Y420 CMDB, VSDB and the like, the device is determined to be provided with 8K50/60DSC 4:2:2 capability.
Other capability resolutions, including video, audio, speaker, etc., are then performed on the display device, along with link layer physical training to further determine the overall capabilities of the display device.
After determining that the cable and display device are capable of receiving and processing 8K50/60DSC 4:2:2 video content and have the associated capabilities, the source device converts the received 8K100/120 video content to 8K50/60 video format, configures the associated functional modules and outputs 8K50/60DSC 4:2:2.
The specific implementation pseudo code is as follows:
it is to be noted that the disclosed embodiments of the present application are intended to aid in further understanding of the present invention, but those skilled in the art will appreciate that: various substitutions and modifications are possible without departing from the spirit and scope of the invention and appended claims. Therefore, the invention should not be limited to the embodiments disclosed, but the scope of the invention is defined by the appended claims.
The meaning of english abbreviations and chinese references for technical terms used in the present invention:
hdmi (high Definition Media interface): high-definition audio and video interface
TMDS (Transmission Minimized Differential Signal): transmitting differential signals
Frl (fixed Rate link): fixed rate connection
VESA (video Electronics Standard Association): video electronics standards association
Dsc (display Stream compression): digital video stream compression algorithm
Ddc (display Data channel): HDMI transceiver end communication channel
Hpd (hot Plug detect): hot plug detection
Edid (extended Display Identification data): extended display presentation data
AVS 3: china third generation digital audio-video coding-decoding standard
VDB (video Data Block) video Data Structure
Adb (audio Data block): audio data structure
Sadb (speaker Allocation Data block): loudspeaker allocation data structure
VSDB (Vendor-Specific Data Block) Vendor Specific Data Structure
VCDB (video Capability Data Block) video Capability Data Structure
Y420 VDB (YCbCr 4:2:0) YCbCr4:2:0 data Structure
Y420 CMDB (Y420 Capability Map Data Block): YCbCr4:2:0 Capability mapping Data structure
HDCP (high Definition Content protection)
CTA (Consumer Technology Association): consumer technology Association
Claims (5)
1. A method for judging and outputting HDMI8K100/120 video, comprising the following steps:
the method comprises the following steps: the source device and the display device are physically linked through an HDMI cable;
step two: the source equipment sends +5V, and the source equipment sends a +5V voltage signal to the display equipment;
step three: the display device returns a Hot Plug Detection (HPD) high level, starts to start after receiving a +5V signal, firstly prepares the content of extended display representation data (EDID), and returns the Hot Plug Detection (HPD) high level to the source device after the extended display representation data (EDID) is prepared;
step four: reading Extended Display Indicating Data (EDID) by a source device, and starting reading the Extended Display Indicating Data (EDID) content of a display device through a communication channel (DDC) of a transmitting and receiving end after a receiving end receives a Hot Plug Detection (HPD) high-level signal;
step five: the source device analyzes the extended display representation data (EDID) and matches the extended display representation data with a preset list, the source device analyzes the content of the extended display representation data (EDID) and knows the overall capability of the display device, including vendor/product information, video data structure (VDB), YCbCr4:2: 0video data structure (YCC420 VDB), YCbCr4:2:0 capability mapping data structure (YCC420 CMDB), vendor specific data structure (VSDB);
step six: the source device judges the capability of the display device according to the extended display representation data (EDID), continues to parse the content of the extended display representation data (EDID) and judge the capability of the display device accordingly, wherein the parsing process comprises a plurality of data structures, looks at a video format coding list of a video data structure (VDB), and knows which video formats are supported by the display device, and whether the video formats comprise 8K 100/120; looking at the YCbCr4:2: 0video data structure (YCC420 VDB) list, understand which video formats the display device supports YCbCr4:2: 0; looking at the YCbCr4:2:0 capability mapping data Structure (YCC420 CMDB) mapping table to see the overall status of the display device supporting YCbCr4:2:0 in all video formats; looking at a vendor specific data structure (VSDB) to learn digital video stream compression algorithm DSC capability parameters of a display device;
step seven: the method comprises the steps that source equipment sets software and hardware parameters according to the capacity of display equipment and carries out physical layer training, the source equipment judges and sets the software and hardware parameters according to the capacity, link training is carried out on the source equipment and the display equipment through an HDMI cable to confirm the physical capacity, and after a conclusion is formed, the functions described by the source equipment complete the software and hardware setting, including receiving and decoding of compressed video, DSC compression and enabling of a digital video stream compression algorithm, HDMI signal integration before encoding, content encryption, fixed rate connection (FRL) or transmission differential signaling (TMDS) encoding and SerDes packaging;
step eight: the source equipment transmits video content, and sends the content to the display equipment through an HDMI cable, wherein the content is specifically an 8K 100/120500 mbps compressed code stream of a broadcasting network AVS3, and becomes video content in a format of DSC8K 1204: 2:0 by using a digital video stream compression algorithm after being processed by the source equipment;
step nine: the display end decompresses and processes and displays other control data, and specifically comprises the following steps: if receiving digital video stream compression algorithm DSC8K 100/1204: 2:0video content, the display device firstly carries out SerDes decapsulation, carries out boundary definition on serial data and restores the serial data to be parallel, then carries out fixed rate connection (FRL) or transmission differential signal (TMDS) decoding to restore pixel byte information, for HDCP encrypted content, the HDCP encryption needs to be released to restore HDMI signals, then the HDMI audio, video and other control data are split, and for YCbCr4:2:0 digital video stream compression algorithm DSC compressed video, corresponding YCbCr4:2:0 digital video stream compression algorithm DSC decompression is carried out; audio, video and other control data also require post-processing, including conversion from YCbCr4:2:0 encoded format to RGB 4:4:4, followed by driving and display, and 8K120 video content is ultimately presented in RGB pixel arrays at 8K resolution, 120Hz or higher refresh rates.
2. The method for judging and outputting the HDMI8K100/120 video according to claim 1, wherein; the five-source device analyzes the extended display representation data (EDID) and matches the extended display representation data with the preset list, mainly comprising the manufacturer name positioned in a basic module field 0x08-0x09 of the extended display representation data (EDID), the product code positioned in 0x0A-0x0B, the serial number positioned in 0x0C-0x0F and the production date positioned in 0x10-0x11, and then matches the preset list according to a pseudo code flow.
3. The method for judging and outputting the HDMI8K100/120 video according to claim 1, wherein; the preset list at least comprises: manufacturer A, product Code A1Code and date of manufacture A1Y; manufacturer A, product Code A2Code, and date of manufacture A2Y; manufacturer B, product Code B1Code and date of manufacture B1Y; manufacturer C, product Code C1Code, and production date C1Y.
4. The method for judging and outputting the HDMI8K100/120 video according to claim 1, wherein: the six source devices judge the capability of the display device according to the extended display representation data (EDID), and specifically the method comprises the following steps: if the vendor/product information matches the preset list of the source device and it is confirmed that the display device has the processing capability of 8K100/120 digital video stream compression algorithm DSC YCbCr4:2:0 or YCbCr4:2: 2, the source device may decide to output 8K100/120 digital video stream compression algorithm DSC YCbCr4:2: 0/4:2:2, and if the vendor/product information cannot match the preset list of the source device or the display device does not have the processing capability of 8K100/120 digital video stream compression algorithm DSC YCbCr4:2:0 or YCbCr4:2: 2, the source device needs to decide to perform degradation processing on 8K100/120, reduce the resolution, or reduce the refresh rate.
5. An apparatus for HDMI8K100/120 video judgment and output using a method for HDMI8K100/120 video judgment and output according to any one of claims 1 to 4.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010811450.4A CN111918013B (en) | 2020-08-13 | 2020-08-13 | HDMI8K100/120 video judgment and output method and device |
| PCT/CN2021/078560 WO2022033013A1 (en) | 2020-08-13 | 2021-03-02 | Method and device for determining and outputting hdmi 8k100/120 video |
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| CN202010811450.4A CN111918013B (en) | 2020-08-13 | 2020-08-13 | HDMI8K100/120 video judgment and output method and device |
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| CN111918013B true CN111918013B (en) | 2022-04-08 |
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| CN111918013B (en) * | 2020-08-13 | 2022-04-08 | 广东博华超高清创新中心有限公司 | HDMI8K100/120 video judgment and output method and device |
| CN113949910A (en) * | 2021-10-15 | 2022-01-18 | 深圳小湃科技有限公司 | Set top box resolution matching method and device, set top box and storage medium |
| CN117055966A (en) * | 2023-10-13 | 2023-11-14 | 深圳中微电科技有限公司 | HDMI-based hot plug detection and processing method, device and storage medium |
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| WO2022033013A1 (en) | 2022-02-17 |
| CN111918013A (en) | 2020-11-10 |
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