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Method and device for signing transport streams of digital television programs

A digital TV and transmission stream technology, applied in the field of data processing, can solve the problems of transmission interruption of transmission stream, pause of terminal playback, time-consuming signature calculation, etc., and achieve the effect of avoiding interruption

Inactive Publication Date: 2012-08-08
DATA ASSURANCE & COMM SECURITY CENT CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] After the transmission of each transmission stream is completed, it is necessary to wait for the signature calculation for this transmission stream to be completed and the signature result to be packaged before starting the transmission of the next transmission stream and sending the packaged signature result, etc., and the signature calculation is usually If it is time-consuming, the transmission of the transport stream will be interrupted, that is, the transport stream will be transmitted intermittently;
[0011] For transport streams with a low average transmission rate, since the time to transmit a transport stream is usually much longer than the time used for signature calculation, there will be no major problems. However, for transport streams with a high average transmission rate, since transmitting a transport stream The time is relatively short, that is, it may be close to the time used by the signature calculation, so the interruption will be more obvious, which will affect the normal playback of the transport stream, such as causing the terminal to stop playing, etc.

Method used

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  • Method and device for signing transport streams of digital television programs
  • Method and device for signing transport streams of digital television programs
  • Method and device for signing transport streams of digital television programs

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Embodiment Construction

[0039] Aiming at the problems existing in the prior art, the present invention proposes an improved scheme for signing digital TV program transport streams, that is, a flexible real-time signature scheme.

[0040] Before introducing the solution of the present invention, some related prior art will be described first.

[0041] The digital TV program transport stream consists of a series of 188-byte transport stream packets.

[0042] Transport Stream packets can be classified into the following types: basic packets, empty packets, and information packets. Among them, the basic package refers to the audio package, video package and data package of each program; the empty package does not carry any information; the information package refers to the program association table (PAT), program mapping table (PMT), etc. A package of information related to each package.

[0043] The first 8 bits in each transport stream packet are synchronization fields with a value of 01000111. In ad...

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Abstract

The invention discloses a method and device for signing transport streams of digital television programs. The method comprises the following steps of: adjusting the size of each segment according to the speed dynamic of signature algorithm, and separating hash algorithm from signature algorithm, i.e. carrying out signature algorithm on the previous segment while carrying out segmentation and signature algorithm on the current segment, thereby preventing the transmission from interrupting as far as possible.

Description

technical field [0001] The invention relates to data processing technology, in particular to a method and device for signing digital TV program transport streams. Background technique [0002] With the development of science and technology, digital TV technology came into being. Due to the advantages of high transmission quality, wide range and fast speed, digital TV technology will gradually replace traditional analog TV technology and has a broad market prospect. [0003] figure 1 It is a schematic diagram of the composition and structure of the existing digital television broadcasting system. like figure 1 As shown, it includes: digital TV program providing subsystem, digital TV broadcasting front-end subsystem, digital TV broadcasting network subsystem and digital TV terminal playing subsystem. [0004] Among them, the digital TV program supply subsystem provides digital TV program transmission streams to the digital TV broadcasting front-end subsystem; the digital T...

Claims

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Application Information

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IPC IPC(8): H04N21/236H04N21/2389
Inventor 荆继武高能夏鲁宁张令臣
Owner DATA ASSURANCE & COMM SECURITY CENT CHINESE ACADEMY OF SCI