MPMoviePlayerController

MPMoviePlayerController用於管理視頻的播放，視頻能夠來自於本地文件或者是網絡數據流。視頻能夠全屏或者內置在moviePlayer擁有的view中播放。你能夠在你的app中在一個view包含視頻播放的view,或者使用MPMoviePlayerViewController來管理。

默認支持AirPlay

當咱們將MPMoviePlayerController加入到視圖中時，須要合理設置frame

MPMoviePlayerController *player =
        [[MPMoviePlayerController alloc] initWithContentURL: myURL];
[player prepareToPlay]
[player.view setFrame: myView.bounds];  // player's frame must match parent's
[myView addSubview: player.view];
// ...
[player play];

(1)添加自定義子視圖

將moviePlayer認爲是一個封閉的結構，你能夠在movie的Layer content上添加自定義的子試圖可是毫不要修改它已經存在的子試圖。 (view)

除了在movie上添加子視圖，能夠在backgroundView上添加子控件。在內置和全屏模式下，自定義的控件都被支持。可是必須調整兩種狀況下的位置。能夠使用通知來判斷和調整。(backgroundView)

Use the MPMoviePlayerWillEnterFullscreenNotification and MPMoviePlayerWillExitFullscreenNotification notifications to detect changes to and from fullscreen mode

MPMoviePlayerController支持代碼控制，也提供了供用戶使用的按鈕。你能夠使用MPMoviePlayerController實現的協議

MPMediaPlayback 中的方法用代碼來控制視頻播放的大部分操做。該協議中的方法能讓你開始，中止，根據當前播放的內容向前或者向後，甚至改變播放的速率。controlStyle屬性可以展現一些系統提供的標準的控制按鈕來控制視頻的播放。同時你也能夠設置shouldAutoplay屬性來決定是否自動播放網絡視頻文件。

當你建立了一個MPMoviePlayerController的時候，你指定了要播放的視頻文件。可是，你能夠經過設置contentUrl屬性來改變正在播放的視頻。改變這個屬性使你從新利用了同一個movie Player

NOTE

Although you can create multiple MPMoviePlayerController objects and present their views in your interface, only one movie player at a time can play its movie.

爲長視頻建立video書籤和章節連接提供便利。MPMoviePlayerController提供了在特定時間生成縮略圖的方法。能夠使用

thumbnailImageAtTime:timeOption:方法來建立單張縮略圖或者用requestThumbnailImagesAtTimes:timeOption:

來建立多張縮略圖。

To play a network stream whose URL requires access credentials, first create an appropriate NSURLCredential object. Do this by calling, for example, the initWithUser:password:persistence: method, as shown here:

• NSURLCredential *credential = [[NSURLCredential alloc]

•                         initWithUser: @"userName"

•                             password: @"password"

•                         persistence: NSURLCredentialPersistenceForSession];

•  

• self.credential = credential;

• [credential release];

In addition, create an appropriate NSURLProtectionSpace object, as shown here. Make appropriate modifications for the realm you are accessing:

• NSURLProtectionSpace *protectionSpace = [[NSURLProtectionSpace alloc]

•                             initWithHost: "@streams.mydomain.com"

•                                     port: 80

•                                 protocol: @"http"

•                                   realm: @"mydomain.com"

•                     authenticationMethod: NSURLAuthenticationMethodDefault];

•  

• self.protectionSpace = protectionSpace;

• [protectionSpace release];

Add the URL credential and the protection space to the Singleton NSURLCredentialStorage object. Do this by calling, for example, the setCredential:forProtectionSpace: method, as shown here:

• [[NSURLCredentialStorage sharedCredentialStorage]

•                     setDefaultCredential: credential

•                       forProtectionSpace: protectionSpace];

With the credential and protection space information in place, you can then play the protected stream.

一 Movie Player Notifications

MPMoviePlayerController是經過通知而非咱們常見的代理來通知視頻播放的狀態的。如下狀況會發送通知

1. 視頻開始播放，暫停，快進，快退（四個）

2. AirPlay播放開始，結束（兩個）

3. 視屏的scaling mode改變了

4. 視頻進入全屏或者退出全屏

5. 網絡視頻的load state改變了

6. 網絡視頻的meta-information能夠得到了

二 支持的格式

.mov, .mp4, .mpv, and .3g

• H.264 Baseline Profile Level 3.0 video, up to 640 x 480 at 30 fps. (The Baseline profile does not support B frames.) 

• MPEG-4 Part 2 video (Simple Profile)

If you use this class to play audio files, it displays a white screen with a QuickTime logo while the audio plays. For audio files, this class supports AAC-LC audio at up to 48 kHz, and MP3 (MPEG-1 Audio Layer 3) up to 48 kHz, stereo audio.