How to use golang to implement rtsp client

In recent years, video has become an important form of information transmission, which has given rise to a widely used video streaming protocol - RTSP (Real Time Streaming Protocol). Compared with HTTP, RTSP has higher transmission efficiency and lower latency. In addition, it supports multiple codec standards, making it more suitable for business scenarios such as live video and video on demand. This article will briefly introduce the RTSP protocol and share an RTSP client based on the golang language.

1. Introduction to RTSP protocol

RTSP protocol is an application layer protocol based on UDP/TCP. Video stream transmission based on the RTSP protocol is usually controlled and synchronized with the help of the RTCP (Real Time Control Protocol) protocol to ensure the real-time and stability of the video transmission. Functionally speaking, the RTSP protocol is very rich in functions and can support multiple types of video transmission such as unicast, multicast, and multicast. In addition, limited by the characteristics of UDP/TCP, the RTSP protocol supports various encoding and decoding standards such as H.264 and VP8.

2. Golang language to implement RTSP client

This section will mainly explain how to use golang language to implement a simple RTSP client. We use the net package and bufio package in the go language because the net package provides network connection-related APIs, while the bufio package provides efficient cache IO operations.

First, we need to establish a connection with the RTSP server by using the TCP protocol:

conn, err := net.DialTimeout("tcp", rtspUrl.Hostname()+":"+rtspUrl.Port(), time.Second*5)

Next, we need to write data to the connection to build a request and send it to the RTSP server:

request := "OPTIONS " + rtspUrl.RequestURI() + " RTSP/1.0\n" +
           "CSeq: " + strconv.Itoa(seq) + "\n" +
           "User-Agent: " + "Golang\n" +
           "Accept: " + "application/sdp\n\n"

For each RTSP request, we need to record the requested sequence number CSeq and verify it in the subsequent response message. At the same time, in the RTSP request message, we also need to specify some request header information, such as User-Agent and Accept.

Next, we need to read the response message from the RTSP server, parse and process it:

reader := bufio.NewReader(conn)
response, err := reader.ReadString('\n')

If the response message is read successfully, we need to check whether its format is correct:

1. RTSP/1.0 200 OK                                                                                           use using ‐ ‐                                 ’ ‐ ’ ’ s ’ s ’ s it ’s ’ s t d ‐                                                 to The request method
2. If the response message format is correct, we need to further parse the content of the response message to obtain its status code and supported request methods and other information:

3. status, _ := strconv.Atoi(strings.Split(response, " ")[1])

According to the response Based on the status code carried by the message, we can determine whether the current request is successful. If successful, we can proceed to the next step, such as sending SETUP, PLAY and other requests to the RTSP server.

3. Summary

The implementation of RTSP client is not too difficult. What needs to be paid attention to is the verification of common request message formats and the information analysis of response messages, as well as the establishment of a network connection. Data processing process. Through the powerful ecological environment and good asynchronous programming features of the go language, we can implement an efficient RTSP client more elegantly.

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