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Packging method capable of randomly accessimg data flow and its related data restoring method

A technology of random access and encapsulation method, applied in the field of audio and video coding and decoding, which can solve the problems of increasing the complexity of grammar design, not easy to grasp the main points, and low efficiency.

Inactive Publication Date: 2005-09-07
SHANGHAI GMT DIGITAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above method for avoiding false random access point identification codes has the following disadvantages: a. increases the complexity of grammar design
These factors unrelated to video compression are mixed in the grammatical structure, making it difficult for people to grasp the main point
c. Not efficient

Method used

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  • Packging method capable of randomly accessimg data flow and its related data restoring method
  • Packging method capable of randomly accessimg data flow and its related data restoring method
  • Packging method capable of randomly accessimg data flow and its related data restoring method

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Embodiment Construction

[0034] The technical solutions of the present invention will be further described below in conjunction with the drawings and embodiments.

[0035] figure 1 It is a flowchart of an embodiment of the method for encapsulating encoded audio and video data into a data stream that can be randomly accessed in the present invention. Such as figure 1 As shown, this embodiment includes the following steps:

[0036] a. Determine the random access point identification code, assuming a 24-bit fixed binary bit string s, i.e. '0110, 0011, 1110, 0000, 0111, 1111', and its first 23 bits are recorded as t;

[0037] b. Generate audio and video encoded data by any encoding method;

[0038] c. Audio and video encoding data is divided into several data segments according to random access points, and for each data segment, repeat steps d, e, f, g until all data is written into the data stream;

[0039] d. First judge whether there are still data segments, if there are still data segments, then w...

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Abstract

The method applicable to encoding and decoding audio / video signal includes following steps: encoding audio / video data; flag code of random access point being inserted into the random access points; some padding bit being inserted into coded audio / video data in order to prevent bit string identical to flag code of random access point from occurring. Method for decoding data stream being able to access data randomly includes following steps: searching flag code of random access point in data stream, and discarding all data before the first flag code of random access point; reading in each binary digit in sequence; determining whether the bit is a data bit or a padding bit; if a padding bit, discarding it, and if a data bit, outputting it as a data. If a next flag code of random access point is met, then a new data block is begun.

Description

technical field [0001] The present invention relates to the technical field of audio and video encoding and decoding in signal processing, and in particular to a method for encapsulating audio and video data into a data stream with random access and a corresponding data recovery method, so that the syntactic structure of the encoded data is designed without The random accessability of the code stream needs to be considered. Background technique [0002] Traditional video coding standards such as H.261, H.263, H.263+, H.264 standards formulated by ITU and MPEG-1, MPEG-2, and MPEG-4 formulated by ISO's MPEG organization all require audio and video coding The data is organized into a random access data stream so that the decoder can start decoding from a set random access point. In the above standards, random access to coded data is realized through start codes, such as video sequence start codes, picture group start codes, picture start codes, and so o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/24
Inventor 赵海武陈勇王国中何芸
Owner SHANGHAI GMT DIGITAL TECH