iOS 推拉流小试牛刀。

既然推拉流,就需要先搭建一个推拉流服务器,nginx服务器的轻量多并发特性,使其很适合作为推拉流服务器,我们就搭建一个nginx服务器,用做推拉流服务器

一、安装Homebrow

已经安装了brow的可以直接跳过这一步。
执行命令

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

如果已经安装过,而想要卸载:

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/uninstall)"

二、安装nginx

先glone nginx项目到本地:

brew tap homebrew/nginx
如果报错的话,可以重复1步骤,并将1的地址换为:
https://github.com/denji/homebrew-nginx 

然后:brew tap denji/nginx

 

执行安装:

brew install nginx-full --with-rtmp-module

安装过程比较缓慢,耐心等待
通过操作以上步骤nginx和rtmp模块就安装好了,下面开始来配置nginx的rtmp模块

首先来看看我们的nginx安装在哪里了

brew info nginx-full

执行上面的命令后我们可以看到信息

nginx基本信息.01

nginx安装所在位置

/usr/local/Cellar/nginx-full/1.10.1/bin/nginx

nginx配置文件所在位置

/usr/local/etc/nginx/nginx.conf

三、运行nginx

执行命令 ,测试下是否能成功启动nginx服务

nginx

命令行如下图所示

在浏览器地址栏输入:http://localhost:8080 (直接点击)
如果出现

代表nginx安装成功了

如果终端上提示

nginx: [emerg] bind() to 0.0.0.0:8080 failed (48: Address already in use)

则表示8080
端口被占用了, 查看端口PID

lsof -i tcp:8080

kill掉占用8080端口的PID

kill 9603(这里替换成占用8080端口的PID)

然后重新执行nginx

nginx常用方法:重新加载配置文件

nginx -s reload

重新加载日志:

 nginx -s reopen

// 停止 nginx

nginx -s stop

// 有序退出 nginx

nginx -s quit

四、配置rtmp

现在我们来修改nginx.conf这个配置文件,配置rtmp
复制nginx配置文件所在位置

/usr/local/etc/nginx/nginx.conf

打开Finder Shift + command + G前往,用记事本工具打开nginx.conf

http {
    ……
}

在http节点后面加上rtmp配置:

rtmp {

  server {
      listen 1935;


    #直播流配置
      application rtmplive {
          live on;
      #为 rtmp 引擎设置最大连接数。默认为 off
      max_connections 1024;


       }
    

      application hls{
    
          live on;
          hls on;
          hls_path /usr/local/var/www/hls;
          hls_fragment 1s;
      }
   }
}

六、安装ffmepg工具

brew install ffmpeg

安装这个需要等一段时间等待吧 然后准备一个视频文件作为来推流,然后我们在安装一个支持rtmp协议的视频播放器,Mac下可以用VLC


VLC.04

显示下图表示ffmpeg安装完毕

ffmpeg安装完毕0.5

ffmepg 安装完成后可以开始推流了

服务端差不多完成,下边开始搞客户端,在这里也可以理解为手机端.

现在开始创建xcode文件吧~推流端用的是LFLiveKit框架,拉流用IJKPlayer,先看下整个文件目录

可以使用cocoapod导入(至于怎么使用cocoapods,我的其他文章里有介绍和转载,

sudo gem install -n /usr/local/bin cocoapods  /

sudo chmod +rx /usr/local/bin



文件目录

是的,没有看错,几个文件就能完成整个推拉流的过程╮(╯╰)╭ 主要实现是HBVideoChatViewController文件


//
//  HBVideoChatViewController.m
//  视频聊天
@interface HBVideoChatViewController ()<LFLiveSessionDelegate>
//当前区域网所在IP地址
@property (nonatomic,copy) NSString *ipAddress;
//我的房间号
@property (nonatomic,copy) NSString *myRoom;
//别人的房间号
@property (nonatomic,copy) NSString *othersRoom;
//ip后缀(如果用本地服务器,则为在nginx.conf文件中写的rtmplive)
@property (nonatomic, copy) NSString *suffix;
//大视图
@property (nonatomic,weak) UIView *bigView;
//小视图
@property (nonatomic,weak) UIView *smallView;
//播放器
@property (nonatomic,strong) IJKFFMoviePlayerController *player;
//推流会话
@property (nonatomic,strong) LFLiveSession *session;
@end

推流

LFLiveKit这个推流框架的关键类是LFLiveSession,也是依靠着个类来实现推流的,底层的实现则是对ffmpeg的封装,有兴趣的童鞋可以去研究研究,废话少说上代码~

首先,创建session并进行一些配置

- (LFLiveSession *)session{
    if (_session == nil) {
        //初始化session要传入音频配置和视频配置
        //音频的默认配置为:采样率44.1 双声道
        //视频默认分辨率为360 * 640
        _session = [[LFLiveSession alloc] initWithAudioConfiguration:[LFLiveAudioConfiguration defaultConfiguration] videoConfiguration:[LFLiveVideoConfiguration defaultConfigurationForQuality:LFLiveVideoQuality_Low1] ];
        //设置返回的视频显示在指定的view上
        _session.preView = self.smallView;
        _session.delegate = self;
        //是否输出调试信息
        _session.showDebugInfo = NO;
    }
    return _session;
}

LFLiveAudioConfiguration和LFLiveVideoConfiguration都可以进行定制,配置的高低影响传输的速度和质量,具体的文档都有中文注释写得很清楚


接着向系统请求设备授权

/**
 *  请求摄像头资源
 */
- (void)requesetAccessForVideo{
    __weak typeof(self) weakSelf = self;
    //判断授权状态
    AVAuthorizationStatus status = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
    switch (status) {
        case AVAuthorizationStatusNotDetermined:{
            //发起授权请求
            [AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted) {
                if (granted) {
                    dispatch_async(dispatch_get_main_queue(), ^{
                        //运行会话
                        [weakSelf.session setRunning:YES];
                    });
                }
            }];
            break;
        }
        case AVAuthorizationStatusAuthorized:{
            //已授权则继续
            dispatch_async(dispatch_get_main_queue(), ^{
                [weakSelf.session setRunning:YES];
            });
            break;
        }
        default:
            break;
    }
}

/**
 *  请求音频资源
 */
- (void)requesetAccessForMedio{
    __weak typeof(self) weakSelf = self;
    //判断授权状态
    AVAuthorizationStatus status = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
    switch (status) {
        case AVAuthorizationStatusNotDetermined:{
            //发起授权请求
            [AVCaptureDevice requestAccessForMediaType:AVMediaTypeAudio completionHandler:^(BOOL granted) {
                if (granted) {
                    dispatch_async(dispatch_get_main_queue(), ^{
                        //运行会话
                        [weakSelf.session setRunning:YES];
                    });
                }
            }];
            break;
        }
        case AVAuthorizationStatusAuthorized:{
            //已授权则继续
            dispatch_async(dispatch_get_main_queue(), ^{
                [weakSelf.session setRunning:YES];
            });
            break;
        }
        default:
            break;
    }
}

通过代理方法来处理连接异常

//连接错误回调
- (void)liveSession:(nullable LFLiveSession *)session errorCode:(LFLiveSocketErrorCode)errorCode{
//弹出警告
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Warning" message:@"连接错误,请检查IP地址后重试" preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction *sure = [UIAlertAction actionWithTitle:@"sure" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        [self.navigationController popViewControllerAnimated:YES];
    }];
    [alert addAction:sure];
    [self presentViewController:alert animated:YES completion:nil];
}

全部设置好就可以开始推流啦~

- (void)viewDidLoad{
    ...
//    推流端
    [self requesetAccessForVideo];
    [self requesetAccessForMedio];
    [self startLive];
    ...
}
- (void)startLive{
    //RTMP要设置推流地址
    LFLiveStreamInfo *streamInfo = [LFLiveStreamInfo new];
    streamInfo.url = [NSString stringWithFormat:@"rtmp://%@:1935/%@/%@",self.ipAddress,self.suffix,self.myRoom];
    [self.session startLive:streamInfo];
}

- (void)stopLive{
    [self.session stopLive];
}

拉流

用IJKPlayer进行拉流,具体的编译和集成步骤可以看iOS中集成ijkplayer视频直播框架,也可以直接将我编译好的IJK拖到项目中即可,在文章最后会给出下载地址

对播放器进行初始化

-(IJKFFMoviePlayerController *)player{
    if (_player == nil) {
        IJKFFOptions *options = [IJKFFOptions optionsByDefault];
        _player = [[IJKFFMoviePlayerController alloc] initWithContentURLString:[NSString stringWithFormat:@"rtmp://%@:1935/%@/%@",self.ipAddress,self.suffix,self.othersRoom] withOptions:options];
        //设置填充模式
        _player.scalingMode = IJKMPMovieScalingModeAspectFill;
        //设置播放视图
        _player.view.frame = self.bigView.bounds;
        [self.bigView addSubview:_player.view];
        //设置自动播放
        _player.shouldAutoplay = YES;
        
        [_player prepareToPlay];
    }
    return _player;
}

设置播放器播放通知监听

- (void)initPlayerObserver{
    //监听网络状态改变
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(loadStateDidChange:) name:IJKMPMoviePlayerLoadStateDidChangeNotification object:self.player];
    //监听播放网络状态改变
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playStateDidChange:) name:IJKMPMoviePlayerPlaybackStateDidChangeNotification object:self.player];
}
//网络状态改变通知响应
- (void)loadStateDidChange:(NSNotification *)notification{
    IJKMPMovieLoadState loadState = self.player.loadState;
    if ((loadState & IJKMPMovieLoadStatePlaythroughOK) != 0) {
        NSLog(@"LoadStateDidChange: 可以开始播放的状态: %d\\n",(int)loadState);
    }else if ((loadState & IJKMPMovieLoadStateStalled) != 0) {
        NSLog(@"loadStateDidChange: IJKMPMovieLoadStateStalled: %d\\n", (int)loadState);
    } else {
        NSLog(@"loadStateDidChange: ???: %d\\n", (int)loadState);
    }
}
//播放状态改变通知响应
- (void)playStateDidChange:(NSNotification *)notification{
    switch (_player.playbackState) {
            
        case IJKMPMoviePlaybackStateStopped:
            NSLog(@"IJKMPMoviePlayBackStateDidChange %d: stoped", (int)_player.playbackState);
            break;
            
        case IJKMPMoviePlaybackStatePlaying:
            NSLog(@"IJKMPMoviePlayBackStateDidChange %d: playing", (int)_player.playbackState);
            break;
            
        case IJKMPMoviePlaybackStatePaused:
            NSLog(@"IJKMPMoviePlayBackStateDidChange %d: paused", (int)_player.playbackState);
            break;
            
        case IJKMPMoviePlaybackStateInterrupted:
            NSLog(@"IJKMPMoviePlayBackStateDidChange %d: interrupted", (int)_player.playbackState);
            break;
            
        case IJKMPMoviePlaybackStateSeekingForward:
        case IJKMPMoviePlaybackStateSeekingBackward: {
            NSLog(@"IJKMPMoviePlayBackStateDidChange %d: seeking", (int)_player.playbackState);
            break;
        }
            
        default: {
            NSLog(@"IJKMPMoviePlayBackStateDidChange %d: unknown", (int)_player.playbackState);
            break;
        }
    }
}

接着在viewDidLoad中调用方法并开始播放

- (void)viewDidLoad {
    [super viewDidLoad];
    
    ...
    //    播放端
    [self initPlayerObserver];
    [self.player play];
}

大功告成,现在只要传入正确的参数就能实现视频聊天啦╰( ̄ ̄)╮

//
//  HBVideoChatViewController.h
//  视频聊天
//
//  Created by apple on 16/8/9.
//  Copyright © 2016年 yhb. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface HBVideoChatViewController : UIViewController
/**
 *  创建视频聊天播放器
 *
 *  @param IPAddress  两个人共同所在的区域网
 *  @param myRoom     我的推流后缀地址(随便写,只要与别人的othersRoom相同即可)
 *  @param othersRoom 别人的推流地址
 *
 */
- (instancetype)initWithIPAddress:(NSString *)ipAddress MyRoom:(NSString *)myRoom othersRoom:(NSString *)othersRoom;
@end

辅助文件

在MainViewController中导入刚写的文件并设置一个alertView来传入参数

//
//  TestViewController.m
//  VideoChat
//
//  Created by apple on 16/8/10.
//  Copyright © 2016年 yhb. All rights reserved.
//

#import "MainViewController.h"
#import "HBVideoChatViewController.h"
@interface MainViewController ()
@property (nonatomic,copy) NSString *ipAddress;
@property (nonatomic,copy) NSString *myRoom;
@property (nonatomic, copy) NSString *othersRoom;
@end

@implementation MainViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];
    [self setButton];
}

- (void)setButton{
    UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];
    [button setTitle:@"跳转到视频聊天界面" forState:UIControlStateNormal];
    button.frame = CGRectMake(0, 0, 200, 50);
    button.center = self.view.center;
    [button addTarget:self action:@selector(buttonClick) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button];
}

- (void)buttonClick{
    //弹出输入框
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Info" message:@"请输入详细信息" preferredStyle:UIAlertControllerStyleAlert];
    [alert addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
        textField.placeholder = @"请输入区域网IP";
    }];
    [alert addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
        textField.placeholder = @"请输入你的房间号";
    }];
    [alert addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
        textField.placeholder = @"请输入对方的房间号";
    }];
    //点击确定按钮跳转界面
    UIAlertAction *sure = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        //                        @"192.168.15.32"
        //取到文本数据传值
        HBVideoChatViewController *viewController = [[HBVideoChatViewController alloc] initWithIPAddress:[alert.textFields[0] text] MyRoom:[alert.textFields[1] text] othersRoom:[alert.textFields[2] text]];
        [self.navigationController pushViewController:viewController animated:YES];
    }];
    //取消按钮
    UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];
    [alert addAction:sure];
    [alert addAction:cancel];
    [self presentViewController:alert animated:YES completion:nil];
    
}
@end


现在用终端推下桌面测试下,模拟器没摄像头所以就没画面了╮(╯_╰)╭
在终端输入
ffmpeg -f avfoundation -i "1" -vcodec libx264 -preset ultrafast -acodec libfaac -f flv rtmp://localhost:1935/rtmplive/home
将自己的桌面推送到服务器上,然后运行模拟器,输入对应IP地址,效果如下
rtmp://localhost:1935/rtmplive/home是我本地的服务器,对应的是自己的IP,我的是192.168.15.30,见下图

注意:用真机测试时,要确保手机wifi连接到所搭建服务器的区域网

推拉流设置的rtmp地址的IP前缀,是你搭建的nginx服务器的IP地址,而且要保证nginx服务器和你推拉流的设备,在统一Wi-Fi环境下.(当然如果有条件的话,可以设置nginx为公网IP,推拉流设备直接开4g网络,将推流到的IP设置为nginx的公网IP).

视频聊天.gif

测试了下大概有3 5秒的延迟,现在在同一区域网下输入对方的房间号就可以实现视频聊天啦

完整项目:Github
网络服务器(不一定可用):rtmp://60.174.36.89:1935/live/xxx
打包好的IJKPlayer:https://pan.baidu.com/s/1o7Frs06
下载解压后直接拖进项目即可

一些关于直播原理和延迟卡顿优化的文章:
http://blog.csdn.net/zhonggaorong/article/details/51483282
http://toutiao.com/i6278412629417394689/
http://blog.ucloud.cn/archives/694
















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转载自blog.csdn.net/a787188834/article/details/80407209