关于Objective C：AVPlayer无法在文档目录iOS中播放MP3音频文件


AVPlayer not playing MP3 audio file in documents directory iOS

我正在使用AVPlayer播放位于文档目录中的MP3(已确认文件位于其中)-我加载AVPlayerItem等待AVPlayerItemStatusReadyToPlay，然后实例化AVPlayer并播放。

AVPlayerItemStatusReadyToPlay确实会被调用，但是实际上没有音频播放，有人知道为什么吗？

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
- (void)checkFileExists {
    if (![[NSFileManager defaultManager] fileExistsAtPath:[self.urlForEightBarAudioFile path]]) {
        [self beginEightBarDownload];
    } else {
        // set up audio
        [self setupAudio];

        //NSLog(@"file %@ already exists", [self.urlForEightBarAudioFile path]);
    }
}


- (void)setupAudio
{
    AVAsset *eightBarAsset = [AVAsset assetWithURL:self.urlForEightBarAudioFile];
    self.eightBarsPlayerItem = [[AVPlayerItem alloc] initWithAsset:eightBarAsset];
    [self.eightBarsPlayerItem addObserver:self forKeyPath:@"status" options:0 context:nil];
}

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
    if ([object isKindOfClass:[AVPlayerItem class]])
    {
        AVPlayerItem *item = (AVPlayerItem *)object;

        if ([keyPath isEqualToString:@"status"])
        {
            switch(item.status)
            {
                case AVPlayerItemStatusFailed:
                    break;
                case AVPlayerItemStatusReadyToPlay:
                    self.player = [[AVPlayer alloc] initWithPlayerItem:self.eightBarsPlayerItem];
                    [self.player play];
                    NSLog(@"player item status is ready to play");
                    break;
                case AVPlayerItemStatusUnknown:
                    NSLog(@"player item status is unknown");
                    break;
            }
        }
        else if ([keyPath isEqualToString:@"playbackBufferEmpty"])
        {
            if (item.playbackBufferEmpty)
            {
                NSLog(@"player item playback buffer is empty");
            }
        }
    }
}

执行此操作：

1
2
3
4
5
6
7
8
9
10
- (void)setupAudio
{
 if([NSFileManager defaultManager] fileExistsAtPath:[self.urlForEightBarAudioFile absoluteString]])
 {
   AVAsset *eightBarAsset = [AVAsset assetWithURL:self.urlForEightBarAudioFile];
   self.eightBarsPlayerItem = [[AVPlayerItem alloc] initWithAsset:eightBarAsset];
   self.eightBarsPlayer = [AVPlayer playerWithPlayerItem:self.eightBarsPlayerItem]; //forgot this line
   [self.eightBarsPlayer addObserver:self forKeyPath:@"status" options:0 context:nil]; // add observer for player not item
 }
}

引用avplayer-and-local-files链接

相关讨论

1
2
3
4
5
6
7
8
- (void)setupAudio
{
  dispatch_async(dispatch_get_main_queue(), ^{
  AVAsset *eightBarAsset = [AVAsset   assetWithURL:self.urlForEightBarAudioFile];
  self.eightBarsPlayerItem = [[AVPlayerItem alloc] initWithAsset:eightBarAsset];
  self.eightBarsPlayer = [AVPlayer  playerWithPlayerItem:self.eightBarsPlayerItem]; //forgot this line
  [self.eightBarsPlayer addObserver:self forKeyPath:@"status" options:0 context:nil]; // add observer for player not item
});

} ??

迅速

1
2
3
4
5
6
func setupAudio() {
 if NSFileManager.defaultManager().fileExistsAtPath(self.urlForEightBarAudioFile.absoluteString) {
   self.eightBarsPlayerItem = AVPlayerItem(asset: AVAsset(URL: self.urlForEightBarAudioFile))
   self.eightBarsPlayer = AVPlayer(playerItem: self.eightBarsPlayerItem)
 }
}