H.264 video codec SoC meets HD DVR design requirements
As one of the core components of the monitoring system, the DVR has developed rapidly in the past 10 years, and has evolved from a replacement for analog tape drives to a professional monitoring digital platform with its own unique value, which is widely accepted by the market. The monitoring system has been developing towards IP and intelligence with the development of DVR in recent years.
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According to the needs of industry users, DVR needs to be paid attention to by the industry in the following directions: 1. The coding mode of DVR is developed to the standard H.264 with higher compression efficiency; 2. The resolution of video is from CIF (352*288 resolution) to D1 (720*576), 720P, 1080P development; 3, on-site monitoring resolution also developed from D1 to HD; 4, closed subsystem to open IP architecture system development; 5, more convenient and quick to find in the massive video Required video.
Based on an understanding of the direction of DVR products, HiSilicon has introduced the Hi3520 to meet the demand for increasingly urgent HD DVRs. The Hi3520 is a high-performance communication media processor based on the ARM11 processor core and video hardware acceleration engine. It is based on H.264, the D1 (720*576 resolution) and megapixel DVR market for the monitoring industry. solution.
As shown in Figure 1, the Hi3520 uses dual ARM architecture computing power up to 1GHz, with hardware acceleration engine, image acceleration engine, H.264 and MJPEG multi-protocol encoding and decoding, codec performance up to 240fps D1@NTSC, can provide the best Multi-channel codec DVR solution; rich video input and output interface (CVBS, HD VGA, BT1120), the highest resolution 1920*1080p@30Hz, can bring a clearer picture quality and video experience, truly achieve customer-to-video And monitoring requirements; on-chip integration of various peripheral interfaces including digital video interface, USB2.0, GMAC, I2S, I2C, GPIO, SPI, UART, SD RAM, DDR, etc., in the development of devices to meet various application scenarios At the same time, it can greatly reduce the BOM cost of the device; at the same time, it has the original video cascade design, which can match the DVR devices of various specifications and models through multi-chip cascade mode, which greatly improves the development speed of the product and reduces the speed. The equipment manufacturer's R&D resources are invested.
Because the DVR device distinguishes the specifications by the number of channels and the resolution of video recording at the same time, for example, 4/8/16 D1/CIF indicates that there are 6 DVR models, and then according to the functional specifications and cost differences, such as increasing DVD recording, audio quantity, etc. There are dozens of products that can be separated, but it is impossible for manufacturers to open multiple platforms for these dozens of DVRs at the same time, so it is very important to support a series of solutions on one chip platform.
Hi3520 chip platform program features
1. Meet the standard H.264 requirements: Hi3520 uses the standard H.264 BP/MP codec algorithm to meet the DVR encoding method to the higher compression efficiency standard H.264; with dual stream design, making storage costs and network Transmission costs are reduced by 30% to 50%, respectively, greatly reducing the barriers to the popularity of D1 and HD DVR.
2, to meet the high-definition video effects: a lot of monitored occasions have high requirements for image quality, if you send a photo of the order, see the denomination of the banknote, see the license plate and so on. This makes the high-definition monitoring system gradually become the market development trend, D1 popularization and even the high-definition 720P ~ 1080P video recording needs.
Hi3520 single chip realizes 8-channel D1 codec performance, and the encoding performance can also achieve various codec resolutions within 1080P, which can meet the requirements of series DVR, and the chip with PCI with master-slave configuration can be very flexible. Achieve the increase or decrease of the chip, it is very easy to realize single-chip 16CIF/4D1, 2 pieces of 8D1, 3 pieces of 12D1, 4 pieces of 16D1 with the same solution and high-definition hybrid DVR, all codec performance can be based on access point simulation and IP camera The number is arbitrarily matched to the specifications and performance of the product.
In the CIF (352 × 288 resolution) DVR era, the key point of the multi-chip cascading scheme is PCI, because the bandwidth of the PCI is fixed, and the preview video is the uncompressed original stream (the amount of data is very large). In general, the original code stream of the two-way D1 running on PCI is already very tight. Therefore, in the high-definition era, it is unrealistic to solve the problem of original video when multi-chip cascading through PCI. Hi3520 proposes the original video cascading channel technology for this problem. Due to the proposed technology, when multiple programs are cascaded, It can ensure that the original source stream of HD can be transmitted from each chip to the Video out port to ensure the effect of real resolution.
3, more real-time high-definition real-time monitoring: real-time high-definition preview image can more realistic feedback to the remote scene environment, which means that the system can help users achieve high-definition centralized monitoring of remote images, achieve orderly centralized management, Reduce staffing and reduce management costs.
Today's monitoring rooms are generally equipped with traditional matrix and video wall modes for monitoring. Due to the limitations of CVBS output, the output image can only be D1 resolution. Just looking at the 4-way CIF video is okay, but the surveillance system's video is more than 4 channels, so a large screen can also be seen clearly when viewing 8 or more channels at the same time. The new monitoring system needs to improve the preview.
We can use high-definition preview images and playback images on monitors and TV walls by using interfaces such as VGA or HDMI. On the one hand, centralized management improves the clarity of each video, and HD can be realized in special occasions. The image satisfies the user's pursuit of image quality in actual engineering, and also reduces the system's use cost. Monitors for CVBS interfaces are becoming more difficult to obtain and costly, and monitors with VGA interfaces can effectively solve this problem.
Different from the VGA and HDMI physical interface concept, Hi3520 provides high-resolution effects of data stream output capability, allowing the monitoring system to achieve high-definition video preview and playback through the VGA/HDMI interface.
4, more convenient and quick to find the required video: 7 × 24 hours of uninterrupted work, making the video data become massive, although the implementation of various alarms and intelligent measures has greatly reduced the difficulty of manual search, but in a group Finding useful information in normal videos without alarms is also often used. How to quickly find the required content in massive data is mentioned in the topic.
The Hi3520 solution has a strong binding relationship between space and time based on the occurrence of events, and builds powerful multi-channel simultaneous playback and high-definition playback output functions, which can help users quickly re-render the video of the associated space at the same time on a large screen. Come out, combined with the fast-forward and slow-release function, you can find the multi-channel video at one time and find the information you need. Greatly reduced the video query time.
5. Closed system development to open IP architecture system: The monitoring system is not the era of a single device video self-proclaimed system. The unified centralized management and continuous capacity expansion requirements are already the basic requirements of a large-scale monitoring system. IP networking is the lowest cost networking method compared to analog networking. And the network of each sub-control center and the center, the networking of the devices in the sub-control center, they all need IP networking, otherwise these put new requirements on the compatibility and interoperability of the equipment.
The Hi3520 follows the standards of Telecom Global Eye 3.0 and provides a standard compression algorithm. It has flexible configuration performance with high-definition codec performance. The optimized GMAC network port greatly reduces the CPU consumption of network switching, making docking of various IP devices. The ability is greatly enhanced to provide powerful support for hybrid DVR management multi-channel HD IP CAMERA.
Summary of this article
The Hi3520 is the third-generation solution that Hais has introduced to surveillance. It is in line with the future direction of monitoring and is closer to the user's usage habits and usage requirements. Inheriting the accumulation of the previous 2 generations of monitoring solutions, the Hi3520SDK architecture greatly enhances the application of new features on the basis of the previous two generations. Customers can maintain more than 85% of API development on Hi3511 products, adding only 15% new With the development of functions, new products can be introduced, which greatly protects the equipment supplier's upfront investment, strengthens the reliability of the equipment, and shortens the product launch time.
Figure 1 Hi3520 chip architecture
Figure 2 Hybrid HD DVR multi-chip cascading solution with 16 D1 and the same solution
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