Data transmission method and system in P2P live streaming

Abstract

The invention provides a data transmission method and a system in P2P live streaming. The method comprises the following steps that: video data is divided into video sub-blocks, and the video sub-blocks are distributed to the nodes of a sender to be transmitted; the nodes of the sender send the obtained video sub-blocks to the nodes of a receiver, and the missing video sub-blocks are positioned; the routing to the candidate nodes is calculated, and the candidate nodes comprise the missing video sub-blocks; the video sub-blocks sent by the nodes of the sender are received, the candidate nodes with the least sub-nodes are selected to be connected according to the routing information, and the missing video sub-blocks are preset; and when the candidate nodes receive the missing video sub-blocks, the video sub-blocks are transmitted to the nodes of the receiver. The invention reduces the delayed time for a terminal user to watch the video, improves the real time property of a live system, effectively reduces the control expenditure of the system, and greatly improves the throughput of the system.

Description

technical field [0001] The invention relates to the field of network streaming media, in particular to a method and system for data transmission in P2P streaming media live broadcast. Background technique [0002] With the development of the Internet, it has become a hotspot to use the network for streaming media playback. Streaming media refers to multimedia that uses streaming technology on the Internet / Intranet. Streaming media does not need to download the entire file before playing, and can be watched while downloading. The principle is to divide the multimedia files transmitted to the user into different segments according to the order of broadcasting time, and then send these segments to the user in turn, and play these segments continuously to form continuous sound and images. [0003] The traditional network streaming media playback system is generally based on the C / S mode. However, since streaming media playback needs to consume a large amount of network bandwid...

AI Technical Summary

Problems solved by technology

[0007] In addition, considering efficiency issues, nodes do not send bitmap information and requests for each data packet, but combine information of a group of data packets and send them together, so that the average time delay of data packets transmitted between nodes is further increased. Big

Nodes also need to periodically send bitmap information and requests to neighboring nodes, which makes the proportion of control information in network traffic higher, resulting in an increase in the control overhead of the system

This situation is very unfavorable in many applications that require high real-time performance, including distance learning and live video, which reduces the service quality and user experience of the system and limits the system throughput.

At the same time, this single-stream method is very sensitive to the dynamics of the node. When the parent node leaves, the data transmission of the child node is greatly affected, and the system will experience a long-term interruption recovery process.

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