AVPlayer无法从NSCachesDirectory播放？

Question

AVPlayer无法从NSCachesDirectory播放？

iphoneiosobjective-cavplayeravplayerlayer

3

你好，我正在尝试从NSCachesDirectory播放视频文件。但是，播放器在videoView层面无法加载来自NSCachesDirectory的文件。

是否有可能从cacheDirectory内存中播放视频？请给我建议...

我已经尝试过以下方法：

NSArray *myPathList = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);  
NSString *cachesDir    = [myPathList  objectAtIndex:0];   
NSString *songPath = [[NSString alloc] initWithString: [cachesDir stringByAppendingPathComponent:[NSString stringWithFormat:@"Song.%@", downloadURL]]];

NSURL *pathurl = [[NSURL  alloc] initFileURLWithPath:songPath];
NSLog(@"--pathurl---%@",pathurl);
avPlayer =[AVPlayer playerWithURL:pathurl];
self.avPlayerLayer =[AVPlayerLayer playerLayerWithPlayer:avPlayer];

if ( !([avPlayer status] == AVPlayerStatusReadyToPlay)   &&  (dataReceivedSoFar.length >10000))
    {

        avPlayerLayer.frame =CGRectMake(0, 0, 320, 450);

        [[self.videoView layer] addSublayer:avPlayerLayer];

        [avPlayer play];

         NSLog(@"Video IS Playing");

        [alert dismissWithClickedButtonIndex:0 animated:YES];

    }

- NextStep

2个回答

网页内容由stack overflow 提供, 点击上面的

可以查看英文原文，
原文链接

- awolCZ · Answer 1

我不确定在这种情况下[avPlayer status] == AVPlayerStatusReadyToPlay会返回YES。AVPlayer加载项需要一些时间。即使使用KVO跟踪AVPlayer.status是更好的方式，但你仍应该可以立即播放。

Lukas

编辑：尝试这种方式（快速胜利）：

NSArray *myPathList = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);  
NSString *cachesDir    = [myPathList  objectAtIndex:0];   
NSString *songPath = [[NSString alloc] initWithString: [cachesDir stringByAppendingPathComponent:[NSString stringWithFormat:@"Song.%@", downloadURL]]];

NSURL *pathurl = [[NSURL  alloc] initFileURLWithPath:songPath];
NSLog(@"--pathurl---%@",pathurl);
avPlayer =[AVPlayer playerWithURL:pathurl];

self.avPlayerLayer =[AVPlayerLayer playerLayerWithPlayer:avPlayer];
avPlayerLayer.frame =CGRectMake(0, 0, 320, 450);

[[self.videoView layer] addSublayer:avPlayerLayer];

[avPlayer play];

- Oleg Shulakov · Answer 2

KVO方法。添加观察者：

self.player = [AVPlayer playerWithURL:url];
[self.player addObserver:self forKeyPath:@"status" options:0 context:&PlayerStatusContext];

观察值

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

    if (context == &PlayerStatusContext) {
        AVPlayer *thePlayer = (AVPlayer *)object;
        if ([thePlayer status] == AVPlayerStatusFailed) {
            NSError *error = [self.player error];
            // Respond to error: for example, display an alert sheet.
            return;
        }
        // Deal with other status change if appropriate.
        if ([thePlayer status] == AVPlayerStatusReadyToPlay) {
            [self play];
        }
    }
    // Deal with other change notifications if appropriate.
    [super observeValueForKeyPath:keyPath ofObject:object
           change:change context:context];
    return;
}

正在播放：

- (IBAction)play:sender {
    [self.player play];
}

编辑：正如awolCZ所说，AVPlayer无法播放部分下载的文件。但是您可以使用类似于http://test.com/test.mp3的URL。