Method and device for rapidly preventing false start code

Abstract

The invention discloses a method and a system for automatically and rapidly preventing a false start code. The system comprises a coding end and a decoding end, wherein the coding end comprises a recording module, a judgment module, an inserted byte processing module and a false start code prefix modifying module; the decoding end comprises a search module, an analysis module, a position acquisition module and a data block recovery module; the coding end records times for that a false start code prefix is generated and positions at which the false start code prefix is generated and inserts 1 to 4 non-0 bytes in front of a first byte of a data block according to corresponding rules to form a new data block so as to ensure the false start code prefix not to be generated in the formed new data block and then the decoding end recovers the required data block according to the corresponding rule. According to the invention, in the processing process of the decoding end, whether the inserted data or start code is generated does not need to be judged at each byte alignment position, so that the calculated amount of the processing process of the decoding end is greatly reduced.

Description

technical field [0001] The invention relates to a method and device for preventing false start codes, in particular to a method for rapidly preventing false start codes when audio and video coded data are organized into random access data streams. Background technique [0002] Traditional video coding standards such as H.261, H.263, H.263+, H.264 standards formulated by ITU (International Telecommunication Union, International Telecommunication Union) and MPEG (International Organization for Standardization, International Organization for Standardization) of ISO (International Organization for Standardization) Moving Pictures Experts Group, MPEG-1, MPEG-2, MPEG-4, etc. formulated by the Moving Pictures Experts Group all need to organize the audio and video coded data into random access data streams, so that the decoder can start from the set random access point start decoding. In the above standards, random access to coded data is realized through start codes, such as video...

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned method for setting prohibited values ​​and mask bits has the following disadvantages: a. increases the complexity of grammar design

[0008] The two types of methods invented by US patent US7839895 and Chinese patent 200310107985. the inserted bits, if present, these inserted bits are removed

This process requires a certain amount of calculation, which will be a burden for a decoder with limited computing power

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