我有一个iPhone和iPad的应用程序，使用AVPlayer播放音频流，我使用Apple Sample StitchedStreamPlayer的相同播放器，但我做了一些更改来播放音乐而不是视频。
当我运行应用程序时，我可以听几秒钟然后，设备重新启动并显示以下错误：
终止以响应SpringBoard的终止。
（当我在设备上使用xcode运行它会播放几分钟时，但当我拔下设备并再次运行应用时，应用程序崩溃了）
我正在使用iPhone 4和iPad mini进行测试，其中没有一个是Jailbroken，而且展位是iOS 6。
代码非常大，但这里有一些部分：
头：
@interface NewPlayer : NSObject <AVAudioSessionDelegate>
@property (strong) AVPlayer *player;
@property (strong) AVPlayerItem *playerItem;
一些重要的实施方法
-(void)play:(NSString *)audio
{
/* Has the user entered a audio URL? */
NSURL *audioUrl = [NSURL URLWithString:audio];
if ([audioUrl scheme]) /* Sanity check on the URL. */
{
/*
Create an asset for inspection of a resource referenced by a given URL.
Load the values for the asset keys "tracks", "playable".
*/
AVURLAsset *asset = [AVURLAsset URLAssetWithURL:audioUrl options:nil];
NSArray *requestedKeys = [NSArray arrayWithObjects:kTracksKey, kPlayableKey, nil];
/* Tells the asset to load the values of any of the specified keys that are not already loaded. */
[asset loadValuesAsynchronouslyForKeys:requestedKeys completionHandler:
^{
dispatch_async( dispatch_get_main_queue(),
^{
/* IMPORTANT: Must dispatch to main queue in order to operate on the AVPlayer and AVPlayerItem. */
[self prepareToPlayAsset:asset withKeys:requestedKeys];
});
}];
}
}
- (void)prepareToPlayAsset:(AVURLAsset *)asset withKeys:(NSArray *)requestedKeys
{
/* Make sure that the value of each key has loaded successfully. */
for (NSString *thisKey in requestedKeys)
{
NSError *error = nil;
AVKeyValueStatus keyStatus = [asset statusOfValueForKey:thisKey error:&error];
if (keyStatus == AVKeyValueStatusFailed)
{
[self assetFailedToPrepareForPlayback:error];
return;
}
/* If you are also implementing the use of -[AVAsset cancelLoading], add your code here to bail
out properly in the case of cancellation. */
}
/* Use the AVAsset playable property to detect whether the asset can be played. */
if (!asset.playable)
{
/* Generate an error describing the failure. */
NSString *localizedDescription = NSLocalizedString(@"Item cannot be played", @"Item cannot be played description");
NSString *localizedFailureReason = NSLocalizedString(@"The assets tracks were loaded, but could not be made playable.", @"Item cannot be played failure reason");
NSDictionary *errorDict = [NSDictionary dictionaryWithObjectsAndKeys:
localizedDescription, NSLocalizedDescriptionKey,
localizedFailureReason, NSLocalizedFailureReasonErrorKey,
nil];
NSError *assetCannotBePlayedError = [NSError errorWithDomain:@"StitchedStreamPlayer" code:0 userInfo:errorDict];
/* Display the error to the user. */
[self assetFailedToPrepareForPlayback:assetCannotBePlayedError];
return;
}
/* At this point we're ready to set up for playback of the asset. */
/* Stop observing our prior AVPlayerItem, if we have one. */
if (self.playerItem)
{
/* Remove existing player item key value observers and notifications. */
[self.playerItem removeObserver:self forKeyPath:kStatusKey];
[[NSNotificationCenter defaultCenter] removeObserver:self
name:AVPlayerItemDidPlayToEndTimeNotification
object:self.playerItem];
}
/* Create a new instance of AVPlayerItem from the now successfully loaded AVAsset. */
self.playerItem = [AVPlayerItem playerItemWithAsset:asset];
/* Observe the player item "status" key to determine when it is ready to play. */
[self.playerItem addObserver:self
forKeyPath:kStatusKey
options:NSKeyValueObservingOptionInitial | NSKeyValueObservingOptionNew
context:MyStreamingAudioViewControllerPlayerItemStatusObserverContext];
/* When the player item has played to its end time we'll toggle
the movie controller Pause button to be the Play button */
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(playerItemDidReachEnd:)
name:AVPlayerItemDidPlayToEndTimeNotification
object:self.playerItem];
/* Create new player, if we don't already have one. */
if (![self player])
{
/* Get a new AVPlayer initialized to play the specified player item. */
[self setPlayer:[AVPlayer playerWithPlayerItem:self.playerItem]];
/* Observe the AVPlayer "currentItem" property to find out when any
AVPlayer replaceCurrentItemWithPlayerItem: replacement will/did
occur.*/
[self.player addObserver:self
forKeyPath:kCurrentItemKey
options:NSKeyValueObservingOptionInitial | NSKeyValueObservingOptionNew
context:MyStreamingAudioViewControllerCurrentItemObservationContext];
}
/* Make our new AVPlayerItem the AVPlayer's current item. */
if (self.player.currentItem != self.playerItem)
{
/* Replace the player item with a new player item. The item replacement occurs
asynchronously; observe the currentItem property to find out when the
replacement will/did occur*/
[[self player] replaceCurrentItemWithPlayerItem:self.playerItem];
[self syncPlayPauseButtons];
}
}
- (void)observeValueForKeyPath:(NSString*) path
ofObject:(id)object
change:(NSDictionary*)change
context:(void*)context
{
/* AVPlayerItem "status" property value observer. */
if (context == MyStreamingAudioViewControllerPlayerItemStatusObserverContext)
{
[self syncPlayPauseButtons];
AVPlayerStatus status = [[change objectForKey:NSKeyValueChangeNewKey] integerValue];
switch (status)
{
/* Indicates that the status of the player is not yet known because
it has not tried to load new media resources for playback */
case AVPlayerStatusUnknown:
{
NSLog(@"desconhecido");
}
break;
case AVPlayerStatusReadyToPlay:
{
/* Once the AVPlayerItem becomes ready to play, i.e.
[playerItem status] == AVPlayerItemStatusReadyToPlay,
its duration can be fetched from the item. */
NSLog(@"ready to play");
[player play];
[self.delegate tocandoMusica];
}
break;
case AVPlayerStatusFailed:
{
AVPlayerItem *thePlayerItem = (AVPlayerItem *)object;
[self assetFailedToPrepareForPlayback:thePlayerItem.error];
NSLog(@"falhou");
[self.delegate acabouMusica];
}
break;
}
}
/* AVPlayer "rate" property value observer. */
else if (context == MyStreamingAudioViewControllerRateObservationContext)
{
//[self syncPlayPauseButtons];
}
/* AVPlayer "currentItem" property observer.
Called when the AVPlayer replaceCurrentItemWithPlayerItem:
replacement will/did occur. */
else if (context == MyStreamingAudioViewControllerCurrentItemObservationContext)
{
AVPlayerItem *newPlayerItem = [change objectForKey:NSKeyValueChangeNewKey];
/* New player item null? */
if (newPlayerItem == (id)[NSNull null])
{
//[self disablePlayerButtons];
//[self disableScrubber];
}
else /* Replacement of player currentItem has occurred */
{
/* Specifies that the player should preserve the video’s aspect ratio and
fit the video within the layer’s bounds. */
[self syncPlayPauseButtons];
}
}
/* Observe the AVPlayer "currentItem.timedMetadata" property to parse the media stream
timed metadata. */
else if (context == MyStreamingAudioViewControllerTimedMetadataObserverContext)
{
//NSArray* array = [[player currentItem] timedMetadata];
//for (AVMetadataItem *metadataItem in array)
//{
//}
}
else
{
[super observeValueForKeyPath:path ofObject:object change:change context:context];
}
return;
}
如果你想深入了解一下，只需看看StitchedStreamPlayer Sample，我就不知道了。我看过了：
Failed to play audio file using AVPlayer in iPhone
memory leak in AudioToolbox library AVAudioPlayer
和其他许多人......
我试图忘记所有这些实现，只使用
player = [AVPlayer playerWithURL:[NSURL URLWithString:url]];
[player play];
但它崩溃了！
有些想法？
EDITED
我尝试了MPMoviePlayerController，但同样的情况发生了，音乐开始了，然后设备重新启动。
这是我用过的代码：
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:NULL];
player = [[MPMoviePlayerController alloc] initWithContentURL:[NSURL URLWithString:[[arrRadios objectAtIndex:indexPath.row] objectForKey:@"url"]]];
[player play];