iPhone开发之音视频的播放——MPMoviePlayerViewController和AVAutoPlayer的使用

╰半夏微凉° 2022-08-04 15:40 204阅读 0赞

新建工程，添加音视频框架

编辑控制器的.h文件如下：

<span style="font-size:18px;">//
    //  ViewController.h
    //  音视频预习
    //
    //  Created by apple on 15/9/4.
    //  Copyright (c) 2015年 LiuXun. All rights reserved.
    //
    
    #import <UIKit/UIKit.h>
    #import <AVFoundation/AVFoundation.h>
    #import <MediaPlayer/MediaPlayer.h>
    @interface ViewController : UIViewController
    
    @property (nonatomic, strong) AVAudioPlayer * player;
    
    @end
    </span>

编辑控制器的.m文件如下：

<span style="font-size:18px;">//
    //  ViewController.m
    //  音视频预习
    //
    //  Created by apple on 15/9/4.
    //  Copyright (c) 2015年 LiuXun. All rights reserved.
    //
    
    #import "ViewController.h"
    
    @interface ViewController ()
    
    @end
    
    @implementation ViewController
    
    - (void)viewDidLoad
    {
        [super viewDidLoad];
    	
        self.view.backgroundColor = [UIColor redColor];
        
        UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
        btn.frame = CGRectMake(20, 200, 213, 40);
        [btn setTitle:@"播放MV" forState:UIControlStateNormal];
        [btn addTarget:self action:@selector(play) forControlEvents:UIControlEventTouchUpInside];
        [self.view addSubview:btn];
    }
    
    -(void) play
    {
        // 播放本地文件视频
    //    NSString *path = [[NSBundle mainBundle] pathForResource:@"test" ofType:@"m4v"];
    //    NSURL *url = [[NSURL alloc] initFileURLWithPath:path];
    //    MPMoviePlayerViewController *playVC = [[MPMoviePlayerViewController alloc] initWithContentURL:url];
    //    [self  presentMoviePlayerViewControllerAnimated:playVC ];
    //    
    //    playVC.view.frame = CGRectMake(100, 100, 200, 300);
    //    [self.view addSubview:playVC.view];
        
        // 播放网路视频文件
    //    NSURL *url= [NSURL URLWithString:@"http://10.50.129.30/mp4files/52070000013B61EC/www.dcjyxwzx.cn/data//news/video//2015/06/20150609134637_60491.mp4"];
    //    MPMoviePlayerViewController  *playVC = [[MPMoviePlayerViewController alloc] initWithContentURL:url];
    //    playVC.view.frame = CGRectMake(0, 100, 320, 200);
    //    [playVC.moviePlayer setControlStyle:MPMovieControlStyleEmbedded];
    //    playVC.moviePlayer.scalingMode = MPMovieScalingModeFill;
    //    [self.view addSubview:playVC.view];
    //    
    //    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(changeFull) name:MPMoviePlayerWillEnterFullscreenNotification object:nil];
    //    [self presentMoviePlayerViewControllerAnimated:playVC];
        
        //播放音频文件
        NSString *path = [[NSBundle mainBundle] pathForResource:@"一江水" ofType:@"mp3"];
        if (path) {
            NSLog(@"LLLL");
            NSURL *url = [[NSURL alloc] initFileURLWithPath:path];
            self.player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
            [self.player prepareToPlay];
            self.player.volume = 1.0f;
            self.player.numberOfLoops = 0;
            if (self.player) {
                if (![self.player isPlaying]) {
                    [self.player play];
                }
            }
            
        }
    }
    
    -(void) changeFull
    {
        NSLog(@"+++++++++");
    
    }
    
    - (void)didReceiveMemoryWarning
    {
        [super didReceiveMemoryWarning];
        // Dispose of any resources that can be recreated.
    }
    
    @end
    </span>

1、播放器类的介绍  
 （1）IOS内置了视频播放器，我们可以通过使用MPMoviePlayerController或者MPMoviePlayerViewController类（视图控制器）来播放视频（含流媒体视频播放）。  
（2）需要引入MediaPlayer.framewrok 库  
（3）MPMoviePlayerController播放器可以任意修改播放页面的尺寸。  
（4）MPMoviePlayerViewController类是一个特殊的视图控制器类，它包含了一个播放器（MPMoviePlayerController）。也能播放MP3。功能不够强大。  
（5）适用于非专业的播放器。  
MPMoviePlayerController使用  
// 初始化url  
NSURL  \*url = \[NSURL URLWithString:@“http://,,,,,,,”;  
// 初始化视频播放  
MPMoviePlayerController \*moviePlayer = \[\[MPMoviePlayer alloc\] initWithContentURL: url\];  
// 将视频播放视图加入  
\[self.view  addSubview: moviePlayer.view\];  
moviePlayer.view.frame = self.view.bounds;  
// 开始播放  
\[moviePlayer play\];  
2、比较常用的几个通知  
// 视频播放结束的通知  
MPMoviePlayerPlayBackDidFinishNotification  
//视频播放状态改变的通知  
MPMoviePlayerPlayBackStateDidChangeNotification  
//视频加载状态改变的通知  
MPMoviePlayerPlayerLoadStateDidChangeNotification  
发送通知的方法：在视频所在的控制器的  
\- (id)initWithNibName:(NSString \*)nibNameOrNil bundle:(NSBundle \*)nibBundleOrNil  方法中获取通知并发送消息  
具体代码如下：

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
    {
        self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
        if (self) {
            [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playDidChangeNotification:) name:MPMoviePlayerPlaybackStateDidChangeNotification object:nil];
        }
        return self;
    }
    
    - (void)playDidChangeNotification:(NSNotification *)notification {
        MPMoviePlayerController *moviePlayer = notification.object;
        MPMoviePlaybackState playState = moviePlayer.playbackState;
        if (playState == MPMoviePlaybackStateStopped) {
            NSLog(@"停止");
        } else if(playState == MPMoviePlaybackStatePlaying) {
            NSLog(@"播放");
        } else if(playState == MPMoviePlaybackStatePaused) {
            NSLog(@"暂停");
        }
    
    }

控制横竖屏的方法如下：

在控制器中添加如下方法

- (BOOL)shouldAutorotate {
        return YES;
    }
    
    - (NSUInteger)supportedInterfaceOrientations {
        return UIInterfaceOrientationMaskLandscapeRight | UIInterfaceOrientationMaskLandscapeLeft;
    }
    
    
    //6.0之前用于控制横、竖
    - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation {
        if (toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft) {
            return YES;
        }
        return NO;
    }