iOS 学习总结----音频/视频处理

来源：互联网发布：防网络诈骗班会总结编辑：程序博客网时间：2024/04/29 21:06

音频:

1.AVAudioPlayer:使用简单，但是只能播放本地

//获取本地mp3链接

NSString*musicPath = [[NSBundlemainBundle]pathForResource:@"music.mp3"ofType:nil];

//NSURL *url = [NSURL URLWithString:musicPath];转换网络连接

//转换本地链接

NSURL*url = [NSURLfileURLWithPath:musicPath];

_audioPlayer = [[AVAudioPlayeralloc]initWithContentsOfURL:urlerror:nil];

_audioPlayer.delegate= self;

[_audioPlayerprepareToPlay];

2.AVPlayer 既可以播放流媒体，也可以播放本地

NSString*str = @"http://www.soge8.com/1424215157/e4eaa401acb097ad2745efe7f8213352.mp3";

_player= [[AVPlayeralloc]initWithURL:[NSURLURLWithString:str]];

后台播放音频:

1.在后台播放音乐(按下home键或锁屏情况下):

//后台任务：音频、定位（耗电量大）、VOIP(网络电话)

//1、在plist文件中设置Required background modes Voide

   //2、将音频设置为支持后台
    [[AVAudioSessionsharedInstance]setCategory:AVAudioSessionCategoryPlaybackerror:nil];

    NSString *str = [[NSBundlemainBundle]pathForResource:@"music.mp3"ofType:nil];
    NSURL *url = [NSURLfileURLWithPath:str];
    _player = [[AVPlayeralloc]initWithURL:url];

[_playerplay];

在视图将要出现时,设置第一响应者和远程控制:

//成为第一响应者

    [selfbecomeFirstResponder];

    //让应用程序接收远程控制器事件
    [[UIApplicationsharedApplication]beginReceivingRemoteControlEvents];

视图消失时取消第一响应者,关闭远程控制:

//取消第一响应者
    [selfresignFirstResponder];
    //关闭远程控制
    [[UIApplicationsharedApplication]endReceivingRemoteControlEvents];

锁屏时显示的信息:

//设置专辑图
    MPMediaItemArtwork *artWork = [[MPMediaItemArtworkalloc]initWithImage:[UIImageimageNamed:@“专辑图片名"]];

    NSDictionary *dic =@{
                          MPMediaItemPropertyAlbumTitle:@“歌曲名",
                          MPMediaItemPropertyArtist :@“歌手名",
                          MPMediaItemPropertyArtwork:artWork
                          };
    //锁屏时显示信息
    [[MPNowPlayingInfoCenterdefaultCenter]setNowPlayingInfo:dic];

//选择线控事件:锁屏时可点击暂停/开始上/下一首(按钮)

- (void)remoteControlReceivedWithEvent:(UIEvent*)event{

if(event.type== UIEventTypeRemoteControl) {
        switch (event.subtype) {
            case UIEventSubtypeRemoteControlPlay:
               [ _player play];
                break;
            case UIEventSubtypeRemoteControlPause:
                [ _player pause];
                break;
            case UIEventSubtypeRemoteControlNextTrack:
                NSLog(@"下一首");
                break;
            case UIEventSubtypeRemoteControlPreviousTrack:
                NSLog(@"上一首");
                break;

            default:
                break;
        }

}

视频:

1.使用MPMoviePlayerController创建视频播放器,设置网络视频连接

NSURL *url = [NSURLURLWithString:@"http://vf1.mtime.cn/Video/2012/04/23/mp4/120423212602431929.mp4"];
//创建播放器
_moviePlayer = [[MPMoviePlayerControlleralloc]initWithContentURL:url];

_moviePlayer.view.frame =CGRectMake(20,50, 320,300);

[self.viewaddSubview:_moviePlayer.view];

2.利用通知来获取播放器的播放/暂停状态,

[[NSNotificationCenterdefaultCenter] addObserver:self selector:@selector(playStateChange:)name:MPMoviePlayerPlaybackStateDidChangeNotificationobject:nil];

通知调用的方法:

- (void)playStateChange:(NSNotification *)notification{

MPMoviePlayerController *playerCtrl = notification.object;
    if (playerCtrl.playbackState == MPMoviePlaybackStatePlaying) {
        NSLog(@"播放");
    }elseif(playerCtrl.playbackState == MPMoviePlaybackStatePaused){
        NSLog(@"暂停");

}

3. 定义一个BOO类型的变量_isPLay,通过取非改变改变播放状态

if (!_isPlay) {
        [_moviePlayerplay];
    }else{
        [_moviePlayerpause];
    }

_isPlay = !_isPlay;

如果不设置全屏,效果图如下:

通过模态视图弹出一个播放器,这个播放器是自动全屏的,不需要设置样式:

NSURL *url = [NSURLURLWithString:@"http://vf1.mtime.cn/Video/2012/06/21/mp4/120621104820876931.mp4"];
    MPMoviePlayerViewController *playerViewCtrl = [[MPMoviePlayerViewControlleralloc]initWithContentURL:url];

    [selfpresentViewController:playerViewCtrlanimated:YEScompletion:nil];

}

效果图如下:

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