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Digital video decoding system

A digital video and video technology, applied in the field of video decoding system, can solve the problems of not supporting SM1 algorithm encrypted video decryption function, not having adaptive decoding and adaptive decryption function, complex structure, etc., achieving low power consumption and low cost , system flexible effect

Inactive Publication Date: 2011-01-19
THE FIRST RES INST OF MIN OF PUBLIC SECURITY +1
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Problems solved by technology

Ordinary digital video decoders do not support the SM1 algorithm and the decryption function for encrypted videos. When the video transmission needs to be encrypted in the monitoring network, ordinary digital video decoders cannot be used.
[0006] Just disclose a kind of AVS video decoder of joint decoding of software and hardware as application number CN200710178279.2 patent application, comprising: adopting DSP (Digital Signal Processor) and coprocessor joint decoding of software and hardware; Software decoding part is controlled by DSP Complete, complete the analysis of the AVS protocol, generate various parameters required for decoding, and control the coprocessor decoding process. The AVS video decoder with the above-mentioned structure of software and hardware joint decoding has a complex structure, does not have adaptive decoding and Flaws of Adaptive Decryption Function

Method used

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Embodiment Construction

[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0021] Such as figure 1 As shown, the digital video decoding system 1 of the present invention includes a network interface 11, a microprocessor 12, a D / A converter 13, and a video amplifier 14 connected in sequence. The video amplifier 14 is externally connected to the display terminal 2, and the microprocessor 12 is also connected to There is a decryption security chip 15, a file system memory 16 and a program memory 17, and the microprocessor 12 is provided with a code stream encryption identification module 122, a decoding preprocessing module 123 and a decoding operation unit 124, wherein the decoding operation unit 124 includes the first algorithm A decoding operation unit 1241 and a second algorithm decoding operation unit 1242 .

[0022] In this embodiment, the network interface 11 is used to receive digital video streams compressed by two different ...

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Abstract

The invention discloses a digital video decoding system comprising a microprocessor, a decoding calculation unit, a D / A converter, a video amplifier and a network interface, wherein the decoding calculation unit at least comprises a first algorithm decoding calculation unit and a second algorithm decoding calculation unit, and the microprocessor is also provided with a decoding pretreatment module. The digital video decoding system of the invention better solves the real-time decoding of the digital video flows of two decoding formats, i.e. the MPEG-4 standard and the H.264 standard and the self-adaptive decryption of the encrypting code stream, and can better satisfy the compatibility demand on equipment in practical application and high-safety application of the monitoring system.

Description

technical field [0001] The invention relates to a video decoding system in the field of video monitoring, in particular to a digital video decoding system with adaptive decoding and adaptive decryption functions. Background technique [0002] Ordinary digital video decoder is mainly composed of network interface, digital video decoding module, D / A conversion, video amplifier and other parts. Its working process is: the network interface of the decoder receives MPEG-4, H.264, etc. The algorithm compresses the encoded digital video stream, and the digital video decoding module calls the decoding operation unit to convert the compressed encoded digital video stream into a non-compressed encoded digital video stream, which is converted into an analog video signal through D / A, and then amplified by a video amplifier Output, which can be connected to analog video equipment for display and playback. [0003] Ordinary digital video decoders generally only support the decoding of on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/16H04N19/12H04N19/42
Inventor 陈朝武房子河卢煜赵振涛张俊业郅晨刘慧念夏宇王艳艳王晓东方盛华
Owner THE FIRST RES INST OF MIN OF PUBLIC SECURITY
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