Question

我想使用AVAUDIOPLAYER从音频流中检索元数据（歌曲，艺术家）。我尝试使用此代码，但我没有从多个URL获取任何数据。

NSURL *url = [NSURL URLWithString:urlString];
AVURLAsset *asset = [AVURLAsset URLAssetWithURL:url options:nil];
NSMutableDictionary *songInfo = [[NSMutableDictionary alloc] init];

for (NSString *format in [asset availableMetadataFormats])

有人帮助我吗？也许我做错了？ AVAUDIOPLAYER可以做到吗？

谢谢

Answer 1

以下是如何创建AVAsset并使用它创建AVPlayerItem的示例，该AVPlayer可以与AVAsset的实例相关联。可以使用var player = AVPlayer() func createAssetAndItem(){ //create AVAsset from an NSURL. metadata can be retrieved from the asset depending on what is available let createdAVAsset = AVURLAsset(URL: songNSURL) //create an AVPlayerItem from the AVAsset let createdAVItem = AVPlayerItem(asset: createdAVAsset) //asscoaite AVPlayerItem with instance of AVPlayer player = AVPlayer(AVPlayerItem: createdAVItem) } ...

的属性检索元数据

function($stateProvider, $urlRouterProvider, $ocLazyLoadProvider) {
        $urlRouterProvider
            .otherwise('/app/home');

        $stateProvider
            .state('app', {
                abstract: true,
                url: '/app',
                templateUrl: "tpl/app.html"
            })
            .state('app.home', {
                url: '/home',
                templateUrl: "tpl/home.html",
                controller: 'HomeCtrl',
                resolve: {
                    deps: ['$ocLazyLoad', function($ocLazyLoad) {
                        return $ocLazyLoad.load([

                            ], {
                                insertBefore: '#lazyload_placeholder'
                            })
                            .then(function() {
                                return $ocLazyLoad.load([
                                    'assets/js/controllers/home.js'
                                ]);
                            });
                    }]
                }
            })
            .state('app.email', {
                abstract: true,
                url: '/email',
                templateUrl: 'tpl/apps/email/email.html',
                resolve: {
                    deps: ['$ocLazyLoad', function($ocLazyLoad) {
                        return $ocLazyLoad.load([
                                'menuclipper',
                                'wysihtml5'
                            ], {
                                insertBefore: '#lazyload_placeholder'
                            })
                            .then(function() {
                                return $ocLazyLoad.load([
                                    'assets/js/apps/email/service.js',
                                    'assets/js/apps/email/email.js'
                                ])
                            });
                    }]
                }
            })
            .state('app.email.inbox', {
                url: '/inbox/:emailId',
                templateUrl: 'tpl/apps/email/email_inbox.html'
            })
            .state('app.email.compose', {
                url: '/compose',
                templateUrl: 'tpl/apps/email/email_compose.html'
            });

    }

使用AVAUDIOPLAYER从音频流中获取元数据

1 个答案: