私は AVPlayer を使用してオーディオ ストリームを再生する iPhone および iPad 用のアプリを持っています。私は Apple Sample StitchedStreamPlayer の同じプレーヤーを使用していますが、ビデオの代わりに音楽を再生するようにいくつかの変更を加えました。
アプリを実行すると、数秒間リッスンできた後、デバイスが再起動し、次のエラーが表示されます。
SpringBoard の終了に応じて終了します。
(デバイスで xcode を使用して実行している場合、数分間再生されますが、デバイスのプラグを抜いてアプリを再度実行すると、アプリがクラッシュします)
テスト用に iPhone 4 と iPad mini を使用していますが、ジェイルブレイクされたものはなく、ブースは iOS 6 です。
コードはかなり大きいですが、一部を以下に示します。
ヘッダ：
@interface NewPlayer : NSObject <AVAudioSessionDelegate>
@property (strong) AVPlayer *player;
@property (strong) AVPlayerItem *playerItem;
実装のいくつかの重要な方法
-(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;
}
詳細を確認したい場合は、StitchedStreamPlayer Sample を見てください。わかりません。私は見ました：
iPhoneでAVPlayerを使用してオーディオファイルを再生できませんでした
AudioToolbox ライブラリ AVAudioPlayer でのメモリ リーク
と他の多くの..
私はこの実装をすべて忘れて、ただ使用しようとしました
player = [AVPlayer playerWithURL:[NSURL URLWithString:url]];
[player play];
しかし、それはクラッシュします！
アイデア？
編集済み
MPMoviePlayerController を試してみましたが、同じことが起こり、音楽が始まり、デバイスが再起動しました。
これは私が使用したコードです：
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:NULL];
player = [[MPMoviePlayerController alloc] initWithContentURL:[NSURL URLWithString:[[arrRadios objectAtIndex:indexPath.row] objectForKey:@"url"]]];
[player play];