AVPlayer和本地文件 [英] AVPlayer And Local Files

问题描述

我正在为iOS制作MP3播放器，播放网络上的音频文件。我想提供离线播放文件的能力，所以我使用ASIHTTP下载文件，但我似乎无法在app文档目录中找到有关初始化AVPlayer的信息。有没有人这样做过？它甚至可能吗？

I am building a MP3 player for iOS that plays audio files hosted on the web. I want to offer the ability to play the files offline so I have the files downloading using ASIHTTP but I am cannot seem to find info on initiallzing AVPlayer with a mp3 in the app documents directory. Has anyone done this before? Is it even possible?

*我在下面发布了一个答案，显示了如何将iOS AvPlayer用于本地和http文件。希望这会有所帮助！

*I posted an answer below that shows how to use the iOS AvPlayer for both local and http files. Hope this helps!

推荐答案

我决定回答我自己的问题，因为我觉得关于如何使用Apple为本地和流（通过http）文件提供了AVPlayer。为了帮助理解解决方案，我在Objective-C的GitHub上整理了一个示例项目和Swift 下面的代码是Objective-C，但你可以下载我的Swift示例来查看。它非常相似！

I decided to answer my own question because I felt like there is very little documentation on how to use the Apple provided AVPlayer for both local and stream (over http) files. To help understand the solution, I put together a sample project on GitHub in Objective-C and Swift The code below is Objective-C but you can download my Swift example to see that. It is very similar!

我发现设置文件的两种方式几乎完全相同，除了你如何为Ass​​et> PlayerItem> AVPlayer实例化NSURL链接。

What I found is that the two ways of setting up the files are almost identical except for how you instantiate your NSURL for the Asset > PlayerItem > AVPlayer chain.

以下是核心方法概述

.h文件（部分代码）

.h file (partial code)

-(IBAction) BtnGoClick:(id)sender;
-(IBAction) BtnGoLocalClick:(id)sender;
-(IBAction) BtnPlay:(id)sender;
-(IBAction) BtnPause:(id)sender;
-(void) setupAVPlayerForURL: (NSURL*) url;

.m文件（部分代码）

.m file (partial code)

-(IBAction) BtnGoClick:(id)sender {

    NSURL *url = [[NSURL alloc] initWithString:@""];

    [self setupAVPlayerForURL:url];
}

-(IBAction) BtnGoLocalClick:(id)sender {

    // - - - Pull media from documents folder

    //NSString* saveFileName = @"MyAudio.mp3";
    //NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    //NSString *documentsDirectory = [paths objectAtIndex:0];
    //NSString *path = [documentsDirectory stringByAppendingPathComponent:saveFileName];

    // - - -

    // - - - Pull media from resources folder

    NSString *path = [[NSBundle mainBundle] pathForResource:@"MyAudio" ofType:@"mp3"];

    // - - -

    NSURL *url = [[NSURL alloc] initFileURLWithPath: path];

    [self setupAVPlayerForURL:url];
}

-(void) setupAVPlayerForURL: (NSURL*) url {
    AVAsset *asset = [AVURLAsset URLAssetWithURL:url options:nil];
    AVPlayerItem *anItem = [AVPlayerItem playerItemWithAsset:asset];

    player = [AVPlayer playerWithPlayerItem:anItem];
    [player addObserver:self forKeyPath:@"status" options:0 context:nil];
}


- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {

    if (object == player && [keyPath isEqualToString:@"status"]) {
        if (player.status == AVPlayerStatusFailed) {
            NSLog(@"AVPlayer Failed");
        } else if (player.status == AVPlayerStatusReadyToPlay) {
            NSLog(@"AVPlayer Ready to Play");
        } else if (player.status == AVPlayerItemStatusUnknown) {
            NSLog(@"AVPlayer Unknown");
        }
    }
}

-(IBAction) BtnPlay:(id)sender {
    [player play];
}

-(IBAction) BtnPause:(id)sender {
    [player pause];
}

查看 Objective-C源代码，用于此示例。
希望这会有所帮助！

Check out the Objective-C source code for a working example of this. Hope this helps!

-Update 12/7/2015我现在有一个 Swift 源代码示例你可以在这里查看 。

-Update 12/7/2015 I now have a Swift example of the source code you can view here.

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