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Adaptive system code FEC (Forward Error Correction) method, device and system based on media content

An adaptive system and media content technology, applied in the field of adaptive system code forward error correction, can solve the problems of reducing system bit error rate and pressure

Active Publication Date: 2019-04-26
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, FEC processing is to reduce the bit error rate of the system at the cost of redundant overhead. Excessive FEC coding will also cause pressure on the system's real-time performance and network status.

Method used

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  • Adaptive system code FEC (Forward Error Correction) method, device and system based on media content
  • Adaptive system code FEC (Forward Error Correction) method, device and system based on media content
  • Adaptive system code FEC (Forward Error Correction) method, device and system based on media content

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Experimental program
Comparison scheme
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Embodiment 1

[0108] Embodiment one: if Figure 4 As shown, the following steps may be included:

[0109] S1: Analyze the header of the encoded and encapsulated data packet, read the priority field in the DU header, and determine the actual number of priorities and the mapping relationship between each priority and the priority field according to the actual application.

[0110] S2: According to the divided priority and the mapping relationship, reorder the original source data flow according to the priority from high to low, and count the number of data packets under each priority, such as Figure 5 shown.

[0111] S3: Perform FEC encoding on the reordered source data stream using the adaptive FEC encoding scheme of the systematic RaptorQ systematic code to generate restored data.

[0112] Specifically, the adaptive FEC encoding method of the RaptorQ system code is used to perform FEC encoding on the intermediate data packet, and the following intermediate codewords are obtained:

[011...

Embodiment 2

[0129] Embodiment two: if Figure 4 As shown, the following steps may be included:

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Abstract

The invention provides an adaptive system code FEC (Forward Error Correction) method, device and system based on a media content. The method comprises the steps of: according to importance information, respectively mapping various sub data packets in a source data packet into different pre-set priorities; rearranging the sub data packets according to the pre-set priorities, so that an intermediatedata packet is obtained; obtaining a recovered data packet after performing FEC coding on the intermediate data packet; adding an index field into the recovered data packet; generating correspondingsignalling information according to the recovered data packet, wherein the signalling information is used for indicating the sub data packets of the recovered data packet in the various priorities, and the proportions of the sub data packets belonging to the corresponding priorities in the recovered data packet; and finally, sending the recovered data packet and the corresponding signalling information to a terminal side. By means of the adaptive system code FEC method, device and system based on the media content in the invention, the data redundancy due to FEC is reduced while the quality ofthe media content is ensured to the most extent; coding and decoding of a system code are relatively flexible; a source data flow does not need to be shunted; and the FEC coding efficiency is increased.

Description

technical field [0001] The present invention relates to the technical field of multimedia transmission, in particular to a media content-based adaptive system code Forward Error Correction (Forward Error Correction, FEC) method, device and system. Background technique [0002] In the heterogeneous network media service system, the content is distributed to the terminal through the Internet protocol or the broadcast protocol, and the Internet uses Transmission Control Protocol / Internet Protocol (Transmission Control Protocol / Internet Protocol, IP / TCP) or user data (User Datagram Protocol, UDP ) message to transmit media data, and broadcast to transmit content through Moving Picture Experts Group2-Transport Stream (MPEG2-TS). UDP packets may be lost after passing through multiple network devices, and broadcast TS may cause bit errors due to the influence of the transmission environment, resulting in broken screens or sound pauses on the terminal side. [0003] Forward Error C...

Claims

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Application Information

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IPC IPC(8): H04L1/00
CPCH04L1/0009H04L1/004H04L1/0056
Inventor 徐异凌张文军姜志乾陈浩管云峰
Owner SHANGHAI JIAO TONG UNIV
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