A method for relaying audio and video data streams in tcp mode based on dss time-sharing system

Abstract

The invention discloses a method for relaying audio and video data streams in a TCP mode based on a DSS time-sharing system, comprising the following steps: step 1, designing a TCP relay plug-in based on a DSS framework; step 2, designing a TCP reflection module plug-in based on a DSS framework; step 3 , The user makes a request to the TCP transfer plug-in at the user terminal, that is, the RTSP client. The TCP transfer plug-in drains the audio and video source according to the data storage file, and transfers the audio and video source to the server. When the server captures the audio and video data stream, it triggers the TCP Reflection plug-in; the data storage file is from the database; step 4: the TCP reflection module plug-in reflects the audio-video data stream in the database corresponding to the user request when the server captures the audio-video data stream, and completes the audio-video data stream transfer . The invention avoids the NAT problem, improves the stability of audio and video data flow transfer, reduces server resource occupation, and smoother audio and video data transmission.

Description

technical field [0001] The invention relates to the operation of transmitting audio and video data streams through the TCP mode under the DSS framework, and more specifically relates to a method for transferring audio and video data streams in the TCP mode based on the DSS time-sharing system. Background technique [0002] Darwin Streaming Server is referred to as DSS. DSS is an open source real-time streaming media server program provided by Apple. The whole program is written in pure C++. It is designed to follow the programming principles of high performance, simplicity, and modularity, so as to achieve high efficiency and good scalability. Therefore, DSS The server system is quite ideal in terms of cross-platform support. It can run on Windows NT, Windows 2000 and above Windows kernel versions, and can also run well on various versions of *NIX, including Mac OS X, Linux , FreeBSD, Solaris, and DSS is developed based on the standard streaming media protocol RTSP, RTP / RTC...

AI Technical Summary

Problems solved by technology

[0006] 2: ReliableRTP, UDP-based code stream transmission will inherit the characteristics of UDP in the transport layer, and there are unreliable characteristics such as packet loss and disorder, so the server needs to complete the serial number detection, the serial number wraps around, and if the expected value of the serial number is judged, it needs to Reliable RTP transmission behaviors such as packet loss or other actions, reordering of data packets and framing, etc., these processes greatly increase the complexity of server development;

[0007] 3: Congestion Control (congestion control), UDP is not a flow-friendly protocol, it does not have the notification window and sliding window in TCP, so UDP cannot control the flow of the sender or receiver, but keeps going to the network Sending a large number of audio and video data packets may cause the video to be very stuck, or the sending network congestion may cause the same route to be paralyzed

However, it is quite difficult to complete a relatively mature congestion control mechanism based on UDP.

[0008] 4: It is difficult to manage the server structure. UDP-based audio and video transmission protocol RTP / RTCP needs to open 2 receiving ports for video stream and audio stream respectively. There are 4 ports in total for code stream reception. When there are only a few audio and video sources It has little impact on server system resources, but there are often thousands or even hundreds of sources in actual engineering projects, which will consume a lot of system resources and cause great difficulties in business control. Once the early planning is not good, it is almost impossible to advance the project

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