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In the field of security surveillance, video sources are exploding, and traditional analog devices are no longer able to meet the growing demand for video information transmission and storage. The emergence and development of digital video compression technology has greatly alleviated this. The contradiction between market demand and equipment, digital video server (DVS) can digitally compress the video signal of the analog camera and transmit it on the Ethernet, store it in the hard disk array, and roughly estimate the color video of D1 all the way. Signal, the original data volume is 720 × 576 × 24bit × 25 frames, after ADC sampling and chrominance space sub-sampling into 4:2:0 format, and then through video compression, the amount of data can be reduced by 200 times (typical code The rate is 1-2Mbps). As more network video devices are deployed and the urgency of 7×24 hours of uninterrupted storage, network bandwidth and storage array resources remain tight, which puts higher demands on digital video servers, and DVS must further Reducing the amount of redundant information of video sources, which provides a very large market space for content-based video analysis technology. Taking license plate recognition as an example, the original data volume of one frame of D1 resolution is 9953280 bits. After identifying the license plate, it is assumed. Each character is represented by 16 bits, and the total is 112 bits. The compression ratio of the information is 100,000 times. The data-based compression algorithm of H.264 can effectively eliminate redundant information, and the compression performance of the data exceeds 500. Times.
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After digitization and networking, intelligence is the next evolutionary goal of digital video servers, which requires video acquisition, pre-processing, video compression, video analysis and networking in a small, low-power device. Multiple functions such as adaptive transmission.
Aowei Video has been committed to providing customers with an embedded evaluation system and reference design that is closer to the product. The development platform AVST_VCA6476 is a two-chip system based on the Texas Instruments DaVinciTM family TMS320DM644x processor and TMS320DM643x processor. The system can perform video analysis and processing while supporting real-time video compression, realizing real-time video acquisition, compression, transmission, analysis and intelligent control. Thanks to the system architecture of TI's high-performance processors, the AVST_VCA6476 platform can provide customers with an ARM926EJS core running at 300MHz and two independent C64x+ high-performance DSP cores, which can support the Linux2.6.x operating system on the ARM core. Responsible for managing the peripherals of the system and the scheduling of two DSP cores and network adaptive transmission. It can support multiple audio and video coding algorithms on the DSP core of DM644x, and can be developed through the VLIB software library on the DSP core of DM643x. Many advanced video analysis algorithms such as license plate recognition, face recognition, moving target detection, and multi-target tracking.
For a 7×24-hour digital video server device, power consumption is critical, so while the system requires a significant increase in computing performance, the system architecture of the multi-processor must be considered to control the system power consumption in a relatively large amount. Low range. Since the processor core power is proportional to the square of the dominant frequency, this means that the power consumption of two 600MHz processors is 50% of the power of a 1.2GHz processor, while the two discrete DSP cores enjoy Physically completely independent memory can avoid the degradation of the effective bandwidth of external memory caused by DMA conflicts caused by video compression algorithms and video analysis algorithms during high-speed data throughput.
Chip interconnect, boot synchronization and multi-core communication and management are the biggest challenges in multi-processor system design. AVST's development platform chose TI's VLYNQTM bus as the physical interconnection between the two processors. It is a cost-effective multi-processor interconnect that can provide theoretical peaks of up to 320 Mbps with very little IO resources. In this system, only one flash is provided for the DM644x main processor, and the coprocessor DM643x is VLYNQ. The bus starts from the DM644x and loads the program image. Since the DM644x processor integrates an ARM926EJS core, the initialization of the DM643x subsystem and the data interaction between the program runtime and the DM644x are performed under the Linux operating system. Larger simplifies the challenges of multiprocessor code debugging.
The AVST_VCA6476 platform provides the industry-leading audio and video algorithm library MMCodecTM 1.0 software package on the DSP side of the DM644x, including AVST's latest H.264-MP encoding algorithm and AVS1.0-XP encoding algorithm. The H.264-MP algorithm can support multiple B pictures (time domain/space bidirectional prediction), multiple reference frames, CABAC entropy encoder, multi-band coding, 4MV motion estimation, full mode 1/4 on the toolset. Pixel precision motion compensation, deblocking filter and DCT transform based on 4x4 block; etc.; AVS1.0-XP algorithm conforming to China's independent intellectual property rights also extends to multiple B images, multiple reference frames, multiple strips in the toolset With coding, 4MV motion estimation, etc.; users can have more choices, flexible configuration coding tools, and choose the video compression algorithm that best suits their application. Also released with MMCodec1.0 are a variety of tested and validated multimedia algorithms including AAC-HE/LC high performance audio codec, G.711/G.729AB vocoder and JPEG. On the ARM side of the DM644x, AVST's latest AVStreamerTM 1.0 streaming media package, including the RTSP protocol stack and the FLV file format, is available on the ARM side. The package supports multiple streaming functions, including .mp4 and .flv file formats. The multi-file volume local recording function, the RTSP-based streaming media network transmission function, the .flv-based remote on-demand function, and all of these functions enable the user to operate on any PC that supports a web browser.
The AVST_VCA6476 platform provides the latest VLIB software library on the DSP side of the DM643x to help video or vision system developers significantly accelerate product development. VLIB is an extensible software library that combines more than 40 software cores and is optimized for the industry-leading TI TMS320C64x+ digital signal processor (DSP) core. These cores perform background modeling and background extraction algorithms, target feature extraction, tracking, recognition, and low-pixel processing to provide a solid foundation for the development of video analytics terminal applications. Developers using VLIB can increase pixel processing performance by up to 10x compared to standard C code, supporting higher resolution and frame rate processing, as well as more advanced features or higher unit devices The number of channels. VLIB benefits applications and market segments such as video surveillance systems, automotive vision, machine vision, and consumer electronics.
The AVST_VCA6476 platform will be delivered in a variety of vertical industry applications. The operating system and all software on the platform will be available to users in the form of an SDK, allowing customers to focus more on contributing to product differentiation. The development of high-value-added video analytics algorithms and the development of the entire product was shortened to 1-3 months.
Multi-core multi-chip systems will become the mainstream solution for embedded mid- to high-end products. Avitech will continue to maintain a high strategic partnership with TI to provide customers with quality original design and solutions.
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