如何基于C++解决RTSP取流报错问题

在C++编程中，使用Live555库对RTSP协议进行取流，有时会出现RTSP取流报错的问题。本文将详细讲解基于C++如何解决这个问题的完整攻略。

分析问题

在C++编程中，使用Live555库进行RTSP取流时，可能会遇到以下异常：

Failed to connect with result WRITE_SETUP_FAILED
Failed to connect with result READ_FAILURE
Failed to connect with result READ_SETUP_FAILED

这些异常的产生原因，主要是rtsp请求返回403，或者401错误。

解决方法

解决这个问题的方法有两种：1.添加认证信息，2.取消认证机制。

添加认证信息

可以通过设置用户名及密码，实现添加认证信息的方式：

authenticator = new Authenticator(username, password);
env->taskScheduler().turnOnBackgroundReadHandling(rtspClientSocket);

取消认证机制

如果认证机制导致RTSP协议无法连接，那么可以通过取消认证机制的方式解决：

env->setBasicAuthenticationUsernameAndPassword(NULL, NULL);

示例说明

以下是两个基于C++解决RTSP取流报错问题的示例说明：

示例一

#include <liveMedia.hh>
#include <BasicUsageEnvironment.hh>

TaskToken taskToken = NULL;
BasicTaskScheduler *scheduler = BasicTaskScheduler::createNew();
UsageEnvironment *env = BasicUsageEnvironment::createNew(*scheduler);

const char *vurl = "rtsp://localhost:8554/test.264";
Authenticator *authenticator = NULL;

const char *username = "username";
const char *password = "password";

RTSPClient *rtspClient = RTSPClient::createNew(*env, vurl, RTSP_CLIENT_VERBOSITY_LEVEL, "live555-test-client");

authenticator = new Authenticator(username, password);
env->taskScheduler().turnOnBackgroundReadHandling(rtspClient->socketNum());
rtspClient->authenticationHandler = this;
rtspClient->sendDescribeCommand(continueAfterDESCRIBE);
env->taskScheduler().doEventLoop(&taskToken);

示例二

#include <cstdio>
#include <cstdlib>
#include <iostream>

#include "liveMedia.hh"
#include "BasicUsageEnvironment.hh"
#include "GroupsockHelper.hh"

TaskToken taskToken = NULL;
BasicTaskScheduler *scheduler = BasicTaskScheduler::createNew();
UsageEnvironment *env = BasicUsageEnvironment::createNew(*scheduler);

Authenticator *authenticator = NULL;

const char *username = "username";
const char *password = "password";
char const* filename = "rtsp://localhost:8554/test.264";
authenticator = new Authenticator(username, password);
env->taskScheduler().turnOnBackgroundReadHandling(rtspClientSocket);
env->setBasicAuthenticationUsernameAndPassword(NULL, NULL);

MediaSubsessionIterator *subIt = NULL;
MediaSession *session = MediaSession::createNew(*env, filename);
if (session != NULL && session->hasSubsessions()) {
    subIt = new MediaSubsessionIterator(*session);

    MediaSubsession *subsession;
    while ((subsession = subIt->next()) != NULL) {
         rtspClient->sendDescribeCommand(subsession, This, continueAfterDESCRIBE, true);
    }
}

通过以上两个示例，我相信您已经能更好地理解如何基于C++解决RTSP取流报错问题了。