Multimedia data network realtime transfer method for supporting error elasticity

Abstract

A method for supporting multimedia data transmission with error resilience is disclosed, thereby the error resilience mechanism of multimedia data real-time transmission can be realized on the transmission protocol layer. In present invention, at first, it provides multimedia data real-time transmission by providing the ERRTP protocol which carrying information about the forward error correction(FEC) coding manner to the exist RTP protocol, so that it can mark the information about the corresponding FEC coding manner for multimedia data at the same time it is transmitted on ERRTP, thereby the error resilience mechanism can be introduced in transmission layer. Next, each standby FEC coding manner can be selected according to present network condition and the level of importance about the multimedia data at transmitting end, so that it can achieve the purpose of protect based on the level, and can realize the equilibrium about the protect ability and the transmission efficiency.

Description

technical field [0001] The invention relates to a multimedia data real-time transmission technology, in particular to a multimedia data real-time transmission method supporting error resilience. Background technique [0002] With the rapid development of computer Internet (Internet) and mobile communication network, the application of streaming media technology is becoming more and more extensive, from online broadcasting, movie playing to distance teaching and online news websites, etc., all use streaming media technology. Currently, there are mainly two ways to transmit video and audio on the Internet: Download and Streaming. Streaming transmission is the continuous transmission of video / audio signals, and when the streaming media is played on the client computer, the rest continues to download in the background. There are two ways of streaming transmission (Progressive Streaming) and real-time streaming (Realtime Streaming). Live streaming is real-time delivery, especia...

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Problems solved by technology

[0053] In practical application, the above-mentioned scheme has the following problems: In the prior art scheme, the error resilience mechanism is implemented at the upper layer of RTP, and the two parties need to realize it through other logical channels when negotiating or notifying the adopted erasure code type and its parameter settings , which seriously affects the efficiency of multimedia transmission and consumes network bandwidth resources;

[0054] For the RTP transmission layer, the error resilience mechanism is transparent, so the RTP layer cannot know the structure of the encoded multimedia data generated by the FEC codec scheme, so it cannot perform targeted encapsulation and de-encapsulation, and cannot simplify the transmission hierarchy. Increase the network transmission delay and make the transmission equipment more complex;

[0055] After the FEC encoding scheme is negotiated and determined by both ends of the transceiver, multimedia data is always transmitted according to the scheme. For data of different importance and network transmission status at different times, the unequal protection mechanism cannot be implemented, and the error resilience mechanism cannot be implemented. To achieve QoS guarantee

[0056] The main reason for this situation is that the existing technology implements error resilience mechanisms such as FEC at a high level, and does not utilize the RTP protocol and its encapsulation. Therefore, the sending and receiving parties need to establish additional logical channels or use specific application layer protocols such as H Some protocols H.245 in the .323 protocol system are used to negotiate or notify the adopted FEC encoding type, structural parameters and other information; no details related to error resilience are involved in the RTP layer, and there is no formulation of how RTP data packets are encapsulated and generated after FEC protection The data nodes and check nodes; also did not select the FEC codec scheme according to the network conditions and the importance of multimedia data, and lacked a mechanism to provide FEC protection with different protection capabilities for data with different relative importance, that is, it was impossible to achieve unequal protection

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