CN102984506A - A 3G-SDI/DVI Portable Video Signal Acquisition Method - Google Patents

Abstract

The invention discloses a 3G-SDI/DVI portable video signal acquisition method, which comprises the following steps: 1) sending the parallel video signals and the position information of the video frame where the video stream is located to a cache module; 2) calculating a memory write address, then circularly storing, and sending a parallel video signal to a frame control coding module; 3) the parallel video signals are directly coded and output to a DVI coding chip, and each frame of the parallel video signals is monitored; 4) when a specific frame or a problem frame is monitored, sending the parallel video signals in the current memory to a processor module with a file system; 5) and sending the parallel video signals to a static storage module for storage. The implementation of the invention has the following beneficial effects: the SDI signal is converted into the DVI signal for convenient analysis, the video image is analyzed in a static picture by setting video slow-playing and static frames, and the specific picture or video can be stored in a static storage module, such as an SD card, in real time.

Description

A 3G-SDI/DVI Portable Video Signal Acquisition Method

technical field

The present invention relates to the field of video acquisition and analysis, and more specifically, relates to a method for acquiring portable high-definition digital video signals of 3G-SDI (3Gbps transmission rate serial digital signal) and DVI (Digital Video Interface).

Background technique

At present, in the field of radio and television in my country, the trend of 3G-SDI signal application has become more and more clear, and equipment providers can race against time to launch their own equipment compatible with 3G-SDI signals. In application, various equipment cascades often have some unexpected error effects. These phenomena are often fleeting and cannot be captured, resulting in the inability to analyze the cause of the problem and thus fail to solve the problem normally. The maintenance personnel of the equipment are not the suppliers of the equipment, let alone the R&D personnel of the equipment. When a problem is found, they cannot determine the problem well. Moreover, the data volume of the 3G-SDI/DVI signal is huge, and it is difficult to find out a specific frame or a problem frame and extract a specific frame or a problem frame in a video frame with a huge data volume.

Therefore, there is a need for a video signal acquisition method, which can monitor video signals in special occasions without computers and external power supplies. When the video signal has a problem effect, the problem video stream can be stored and analyzed in the background, or handed over to technical personnel. , in order to solve the problem.

Contents of the invention

Aiming at the above problems, the present invention develops a 3G-SDI/DVI portable video signal collection method.

A kind of 3G-SDI/DVI portable video signal acquisition method, it is characterized in that, comprises the storage step of specific frame or problem frame, and step is as follows:

1) The video analysis module equalizes the SDI video signal at the receiving end, converts the equalized serial video signal into a parallel video signal, and obtains the position information of the video frame where the video stream is located, and then compares the parallel video signal with the video stream where the video stream is located. The location information of the frame is sent to the cache module together;

2) After the cache module calculates the memory write address according to the location information of the video frame where the video stream is located and its own storage parameters, the parallel video signal is cyclically stored, and the parallel video signal is sent to the frame control encoding module;

3) The frame control encoding module directly encodes the parallel video signal from the cache module and outputs it to the DVI encoding chip to monitor each frame of the parallel video signal;

4) When a specific frame or problem frame is monitored, the cache module is controlled through the man-machine interface to send the parallel video signal in the current memory to the processor module with a file system;

5) The processor module with the file system sends the parallel video signal to the static storage module for storage.

The method of the present invention also includes an analysis step of a specific frame or a problem frame, the steps are as follows:

6) Control the processor module with file system through the man-machine interface to read out the parallel video signal stored in the static storage module according to the rules, and store it in the memory of the cache module;

7) The cache module sends parallel video signals to the frame control coding module in the form of frames according to the setting parameters of the frame control coding module;

8) The frame control encoding module sends the parallel video signal to the DVI encoding chip for output.

Step 1) of the present invention also includes the step of: converting the parallel video signal and the position information of the video frame where the video stream is located to the cache module after bit width conversion. The bit width conversion rule is as follows: set the memory data in the cache module The bit width is a, the data bit width of the parallel video signal is b, and c groups of parallel video signals are taken and stored in d memory addresses, where c and d are the two remainders of the common multiple of a and b, and c>d.

In step 8) of the present invention, the frame control encoding module sends the parallel video signal to the DVI encoding chip for output by means of frame doubling, frame skipping or frame freezing.

Implementing the present invention has the following beneficial effects: (1) Utilize the memory in the cache module to store 3G-SDI/DVI video signals circularly, and monitor the 3G-SDI/DVI video signals in the memory by playing video, when a specific frame is found or problematic frame, store the 3G-SDI/DVI video signal in the current memory to the static storage module, so that technicians can analyze the 3G-SDI/DVI video signal in the static storage module later; (2) By converting the bit width of the parallel video signal and the position information of the video frame where the video stream is located, they are sent to the cache module together to avoid waste of memory space; (3) By controlling the frame control encoding module to use frame doubling, frame skipping or static The parallel video signal is sent to the DVI encoding chip for output in the form of frames, so that technicians can better analyze specific frames or problem frames by slowing down, fast forwarding or stilling frames; (4) The display device application of the SDI signal does not have DVI There are a wide range of display devices. We convert SDI signals into DVI signals, which is convenient for the staff to analyze anytime and anywhere. In order to realize the processing of each frame capture, the operator can make the video slow down and freeze the frame by setting, so that in the static The video image is analyzed in the picture, and the specific picture or video can be stored in the static storage module in real time.

Description of drawings

Fig. 1 is the hardware structural representation of an embodiment realizing the 3G-SDI/DVI portable video signal acquisition method of the present invention;

Fig. 2 is the method flowchart of the bit width conversion of an embodiment of the 3G-SDI/DVI portable video signal acquisition method of the present invention;

Fig. 3 is a hardware system diagram of an embodiment implementing the 3G-SDI/DVI portable video signal acquisition method of the present invention.

Detailed ways

The invention provides a 3G-SDI/DVI portable video signal collection method, which can collect, analyze and cache 3Gbps high-definition digital video and audio signals, and supports HD (high definition) digital video signals and SD (standard definition) Digital video signal, when the problematic video image occurs, the acquisition device will store the data in the buffer into the static storage module. Afterwards, the problem video can be analyzed through the DVI playback output function, and the problem video data in the static storage module can also be copied to the computer for analysis.

FIG. 1 is a schematic diagram of the hardware structure of an embodiment of the 3G-SDI/DVI portable video signal acquisition method of the present invention, as shown in the figure.

The hardware structure realizing the 3G-SDI/DVI portable video signal collection method of the present invention comprises a video analysis module, a high-speed cache module, a frame control coding module, a processor module with a file system, and a static storage module, wherein the video analysis module, frame control The encoding module and the processor module with a file system are all connected to the cache module, and the static storage module is controlled by the processor module with a file system. The functions of each module are as follows:

The video analysis module is used to equalize the SDI video signal at the receiving end; serial-parallel convert the equalized serial video signal into a parallel video signal, and analyze the video to obtain the position information of the video frame where the video stream is located.

The cache module includes a memory and a memory controller for real-time operation and processing of high-speed data. The CycloneⅣ series FPGA is used in this system, or a higher performance series FPGA is used to control the 4G/8G capacity DDR3 memory. The core of this module is the controller of DDR3 memory. It processes the video frames sent by the video analysis module, calculates the memory address where the current data is stored, and performs circular storage. At the same time, it can also read back the data in the memory and send it to the processor module with a file system. After the acquisition module serializes and merges the SDI video signals, the video analysis module aligns and sorts the video frames, and the memory controller in the cache module stores the video frames regularly in the memory stick according to the memory alignment technology developed by itself. And carry out circular storage. The length of the cache time depends on the size of the memory and the format of the SDI video signal. The memory controller customizes the storage boundary of the video according to the agreed video stream format. It is guaranteed that a complete frame of video data of any time period can be correctly retrieved.

The processor module with a file system is the control processor of the entire device. It works through the instructions obtained from the man-machine interface, stores the video data sent by the cache module in the static storage module, and can also store the files in the static storage module The data is read out and passed into the high-speed cache module; the static storage module has a file system, and the file system can be a file system in any format, such as a FAT file system or a FAT32 file system or an NTFS file system.

Frame control encoding module, the data source has two channels, the first channel is to directly encode and output the data sent by the video analysis module to the DVI interface, just to realize the preview function; the second channel is directly connected to the cache module , by calculating the read frame address of the memory, let the cache module transmit the frame data in the memory according to the cycle and instructions of the frame control coding module, so that the fast and slow playback and still frame of the frame can be realized.

The static storage module is the place where the video data is finally saved. In order to improve compatibility and read on the PC, it supports any format file system, including the FAT file system. The video data can be written into the hard disk through the card reader, and at the same time Read and write the processor module with file system into the cache module.

The core principle of the method of the present invention is: after the DVI outputs the video, when the original video monitoring equipment finds the problem video, the memory controller in the cache module will stop writing the video information to the internal memory through key operation. A complete segment of problematic video data is stored in the memory, and the memory controller takes out the video segment data in the memory in chronological order and submits them to the parallel IO of the processor module with a file system. Store the video stream into a static storage module for permanent storage. When analyzing the problematic video stream, you only need to connect the DVI output terminal to the display that supports the DVI interface, operate the device, select the playback file, and the processor module with file system will read out the corresponding file in the static storage module and send it to the cache module On the parallel IO, the memory controller will switch from the acquisition channel to store the data on the parallel IO in the memory. After the storage is completed, the memory controller block will read the frame data of the memory stick according to the frame rate set by the user. Take and send to the frame control encoding module, and finally the frame control encoding module sends the data to the DVI encoding chip to realize DVI output. Slow video images can be seen on the display by adjusting the playback rate, making it easier for the operator to determine the problem video frame, and to freeze or skip frames through the operation.

The 3G-SDI/DVI portable video signal collection method of the present invention comprises the storage step of specific frame or problem frame, and step is as follows:

1) The video analysis module equalizes the SDI video signal at the receiving end, converts the equalized serial video signal into a parallel video signal, and obtains the position information of the video frame where the video stream is located, and then compares the parallel video signal with the video stream where the video stream is located. The location information of the frame is sent to the cache module together;

2) After the cache module calculates the memory write address according to the location information of the video frame where the video stream is located and its own storage parameters, the parallel video signal is cyclically stored, and the parallel video signal is sent to the frame control encoding module;

3) The frame control encoding module directly encodes the parallel video signal from the cache module and outputs it to the DVI encoding chip to monitor each frame of the parallel video signal;

4) When a specific frame or problem frame is monitored, the cache module is controlled through the man-machine interface to send the parallel video signal in the current memory to the processor module with a file system;

5) The processor module with the file system sends the parallel video signal to the static storage module for storage.

The 3G-SDI/DVI portable video signal collection method of the present invention also includes the analysis step of specific frame or problem frame, and the steps are as follows:

6) Control the processor module with file system through the man-machine interface to read out the parallel video signal stored in the static storage module according to the rules, and store it in the memory of the cache module;

7) The cache module sends parallel video signals to the frame control coding module in the form of frames according to the setting parameters of the frame control coding module;

8) The frame control encoding module sends the parallel video signal to the DVI encoding chip for output.

As a preferred technical solution of the present invention, step 1) also includes the step of: converting the parallel video signal and the position information of the video frame where the video stream is located to the cache module after bit width conversion, and the bit width conversion rule is as follows: set the cache The memory data bit width in the module is a, the data bit width of the parallel video signal is b, take c groups of parallel video signals and store them in d memory addresses, where c and d are the two remainders of the common multiple of a and b, And c>d.

FIG. 2 is a flow chart of a bit width conversion method of an embodiment of the 3G-SDI/DVI portable video signal acquisition method of the present invention, as shown in the figure. The collected SDI video signal is 20bit parallel data, and storing it directly in the memory will waste most of the memory space. After converting 16 sets of 20bit data bit width into 320bit buffer through the clock signal 16x CLK, it becomes 5 bits of the memory bandwidth. Integer multiple, so use the clock signal (16/5) x CLK to divide 320bit into 5 equal parts and store them in the pre-internal FIFO buffer (64bit) of the DDR3 controller (the DDR3 controller is the memory controller in the cache module) , waiting for the storage of the DDR3 memory (the DDR3 memory is the memory in the cache module). The DDR3 controller directly outputs the data in the memory to the internal output FIFO buffer (64bit) of the subsequent stage, and the subsequent bit width conversion module decomposes the 64bit bandwidth data into 8 bytes and sends them to the controller for static storage; similarly , the controller reads out the statically stored data according to every 8 bytes to form a 64bit data and sends it to the subsequent stage of the DDR3 controller into the FIFO buffer (64bit) for reading.

As a preferred technical solution of the present invention, in step 8), the frame control encoding module sends the parallel video signal to the DVI encoding chip for output by means of frame doubling, frame skipping or still frame, thereby realizing fast and slow playback and still frame of the video signal play.

The principles of fast and slow playback and still frame playback of video signals are as follows:

The controller imports the file data in the static memory to the bus, and the memory controller stores the data on the bus into the DDR3 memory in the order of frames, waits for the memory reading parameters sent by the video frame control module, and then reads the DDR3 memory The video frames in the strip are read. The video frame control module outputs the video frame to the DVI encoding chip according to the setting requirements.

Fig. 3 is a hardware system diagram of an embodiment for realizing the 3G-SDI/DVI portable video signal acquisition method of the present invention, as shown in the figure.

The PLL clock system controls the clock of the entire hardware system. The video analysis module receives the SDI video signal through the video interface. The video data output by the frame control encoding module to the DVI encoding chip is in a fixed format, such as 1920x108060Hz, in order to achieve slow playback and fast playback. Play effect and support real-time static frame function, the frame control encoding module adopts frame doubling and frame skipping, that is, changing the number of readings of each frame in the DDR3 memory (SO-DIMM204 shown in the figure) to achieve slow playback, In the same way, change the reading of frame skipping in DDR3 memory to achieve fast playback. The frame control encoding module obtains the configuration parameters on the Avalon bus, that is, the speed of playing frames, calculates the number of repetitions or frame skips that need to be played for each frame, and calculates the frame header address of each frame, and starts to count the video data , when the DDR3 controller counts the video data to a full frame, the DDR3 controller is notified to transfer to the memory address of the next frame to be played to continue reading. After the freeze frame instruction is sent to the video frame control module, the video frame control module will repeat the above process, and keep the DDR3 data address where the next frame is located unchanged, so as to achieve the purpose of freeze frame.

In this example, the realization hardware of the present invention uses external high-speed DDR3 memory (large-capacity memory), which can store full high-definition digital video data up to 3Gbps transmission rate, and the capacity of DDR3 memory directly determines the length of collecting SDI video. We use 4G Capacity SO-DIMM 204P DDR3 memory stick can store standard definition SD up to 121 seconds, HD-SDI up to 22 seconds, 3G signal can also reach 11 seconds, and these values can be increased through DDR3 cascading.

In this embodiment, the data storage in the video data collection stage of the present invention is not to store the video data directly and statically. The memory controller stores the input parallel video data in a DDR3 memory in a cyclic manner, and plays and collects in real time in the DVI output interface. When the staff detects a problem image, the video data cached in the internal memory will be stored statically through the processor module with a file system, that is, stored in the SD card through the SD card slot, so as to capture the problem video Image purpose. In the present embodiment, the processor module with the file system is a Nois II processor, and the file system it carries is a FAT file system, which is connected to a synchronous dynamic random access memory (SDRAM) by an SDRAM card slot.

In this embodiment, the FAT file system is transplanted into the implementation hardware of the present invention, and all operating systems of the personal computer support the FAT file system, and the stored files can be copied to the hard disk of the computer in a very simple manner. This avoids the use of a separate acquisition tool or software and simplifies the cumbersome operation steps. The video image analysis software in the computer can analyze the collected data more easily.

The frame control playback technology is used to realize the frame control effect by controlling the reading and writing rules of the frames in the memory. The slow playback and still frame function in the hardware of the present invention is to provide analysts with the most direct analysis method, and find the problem through slow playback. And freeze the frame, carefully analyze the image of each frame, and point out the problem more intuitively.

The present invention is a portable device, and its power consumption and volume depend on the systematic design. The system adopts CycloneⅣ series FPGA with low power consumption and high integration, and integrates all modules into this chip, and puts the controller into the FPGA. This reflects the advantages of high integration cost and low power consumption, and also reduces the pressure on the system lithium battery, while reducing the size and weight of the handheld device.

The beneficial effect of the present invention is: utilize the memory bar to carry out circular buffering to the video of the acquisition up to 3Gbps transmission rate, this is because the storage speed that other non-volatile storage devices are difficult to reach, and because the video data volume is huge, so It is impossible for acquisition devices to store high-speed video streams in large quantities, and the video data with the size of the memory capacity has exceeded the length of the video we use for analysis. According to the settings of the operator, this part of the cached video clips can be transferred and stored in a static storage module (such as an SD card) to realize non-volatile data storage. The display devices of SDI signals are not as widely used as DVI display devices. We convert SDI signals into DVI signals, which is convenient for staff to analyze anytime and anywhere. In order to realize the processing of each frame capture, the operator can set the video to slow down. and still frames to analyze video images in still frames. Staff can also choose to use dedicated video analysis software to conduct specific analysis on the video data in the static storage module.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, any person familiar with the technical field within the technical scope disclosed in the present invention, according to the technical solution of the present invention Any equivalent replacement or change of the inventive concepts thereof shall fall within the protection scope of the present invention.

Claims (4)

1. a kind of 3G-SDI/DVI portable video signal collection method is characterized in that, comprises the storage step of specific frame or problem frame, and step is as follows: 1) The video analysis module equalizes the SDI video signal at the receiving end, converts the equalized serial video signal into a parallel video signal, and obtains the position information of the video frame where the video stream is located, and then compares the parallel video signal with the video stream where the video stream is located. The location information of the frame is sent to the cache module together; 2) After the cache module calculates the memory write address according to the location information of the video frame where the video stream is located and its own storage parameters, the parallel video signal is cyclically stored, and the parallel video signal is sent to the frame control encoding module; 3) The frame control encoding module directly encodes the parallel video signal from the cache module and outputs it to the DVI encoding chip to monitor each frame of the parallel video signal; 4) When a specific frame or problem frame is monitored, the cache module is controlled through the man-machine interface to send the parallel video signal in the current memory to the processor module with a file system; 5) The processor module with the file system sends the parallel video signal to the static storage module for storage. 2. 3G-SDI/DVI portable video signal acquisition method according to claim 1, is characterized in that, also comprises the analysis step of specific frame or problem frame, and step is as follows: 6) Control the processor module with file system through the man-machine interface to read out the parallel video signal stored in the static storage module according to the rules, and store it in the memory of the cache module; 7) The cache module sends parallel video signals to the frame control coding module in the form of frames according to the setting parameters of the frame control coding module; 8) The frame control encoding module sends the parallel video signal to the DVI encoding chip for output. 3. The 3G-SDI/DVI portable video signal collection method according to claim 1, characterized in that step 1) further includes the step of converting the bit width of the parallel video signal and the position information of the video frame where the video stream is located Send them to the cache module together, and the bit width conversion rules are as follows: set the memory data bit width in the cache module as a, and the data bit width of the parallel video signal as b, take c groups of parallel video signals and store them in d memory addresses, Wherein, c and d are the two remainders of the common multiple of a and b, and c>d. 4. The 3G-SDI/DVI portable video signal acquisition method according to claim 2, wherein in step 8), the frame control encoding module sends the parallel video signal to the DVI encoding chip output.

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