用直播(推拉流)模拟实现视频聊天功能(iOS)

demo已经写好很久了,懒癌证复发一直没上传~开始进入正题
本文主要是用来练习如何实现直播功能,既推流+拉流,真正的视频聊天并不是这么做的╮(╯▽╰)╭ 咱们的目的是学会如何实现直播功能

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说下简单的步骤:搭建本地服务器->推流->拉流->perfect <(￣▽￣)> 哇哈哈…
实现原理:既向一个服务器同时进行推流和拉流,只不过对应的"房间号"不同而已,比如A和B住在同一栋楼(IP地址),A从B的房间拿东西(拉流)并且A向自己的房间放东西(推流);B向A的得房间拿东西(拉流)并且B向自己的房间放东西(推流);此时只要输入正确的房间号就可以实现了

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服务器

首先你要找到一个测试服务器或者创建本地Nginx服务器,搭建本地服务器请看JJAAIR的文章Mac搭建nginx+rtmp服务器
注意注意,搭建服务器配置nginx.conf文件时,application可以随便写,但要记住,后面会用到

nginx.conf

概述

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

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

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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

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

文／SimonDeCft（简书作者）
原文链接：http://www.jianshu.com/p/1b57c02cf9e0
著作权归作者所有，转载请联系作者获得授权，并标注“简书作者”。