我正在使用
this approach保存视频文件的AVPlayer的缓冲区数据.在这个问题
Saving buffer data of AVPlayer中找到答案.
iPhone和iPad – iOS 8.1.3
我做了必要的更改,播放视频,它的工作非常好,除非我尝试播放一个很长的视频(11-12分钟长,大约85mb),视频将在连接完成加载后大约4分钟停止.我收到一个playBufferEmpty和播放器项目停止通知的事件.
这是代码的要点
viewController.m
@property (nonatomic,strong) NSMutableData *videoData;
@property (nonatomic,strong) NSURLConnection *connection;
@property (nonatomic,strong) AVURLAsset *vidAsset;
@property (nonatomic,strong) AVPlayerItem *playerItem;
@property (nonatomic,strong) AVPlayerLayer *avlayer;
@property (nonatomic,strong) NSHTTPURLResponse *response;
@property (nonatomic,strong) NSMutableArray *pendingRequests;
/**
Startup a Video
*/
- (void)startVideo
{
self.vidAsset = [AVURLAsset URLAssetWithURL:[self videoURLWithCustomScheme:@"streaming"] options:nil];
[self.vidAsset.resourceLoader setDelegate:self queue:dispatch_get_main_queue()];
self.pendingRequests = [NSMutableArray array];
// Init Player Item
self.playerItem = [AVPlayerItem playerItemWithAsset:self.vidAsset];
[self.playerItem addobserver:self forKeyPath:@"status" options:NSkeyvalueObservingOptionNew context:NULL];
self.player = [[AVPlayer alloc] initWithPlayerItem:self.playerItem];
// Init a video Layer
self.avlayer = [AVPlayerLayer playerLayerWithPlayer:self.player];
[self.avlayer setFrame:self.view.frame];
[self.view.layer addSublayer:self.avlayer];
}
- (NSURL *)getRemoteVideoURL
{
Nsstring *urlString = [@"http://path/to/your/long.mp4"];
return [NSURL URLWithString:urlString];
}
- (NSURL *)videoURLWithCustomScheme:(Nsstring *)scheme
{
NSURLComponents *components = [[NSURLComponents alloc] initWithURL:[self getRemoteVideoURL] resolvingAgainstBaseURL:NO];
components.scheme = scheme;
return [components URL];
}
/**
NSURLConnection Delegate Methods
*/
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
NSLog(@"didReceiveResponse");
self.videoData = [NSMutableData data];
self.response = (NSHTTPURLResponse *)response;
[self processpendingRequests];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
NSLog(@"Received Data - appending to video & processing request");
[self.videoData appendData:data];
[self processpendingRequests];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSLog(@"connectionDidFinishLoading::WritetoFile");
[self processpendingRequests];
[self.videoData writetoFile:[self getVideoCachePath:self.vidSelected] atomically:YES];
}
/**
AVURLAsset resource loader methods
*/
- (void)processpendingRequests
{
NSMutableArray *requestsCompleted = [NSMutableArray array];
for (AVAssetResourceLoadingRequest *loadingRequest in self.pendingRequests)
{
[self fillInContentinformation:loadingRequest.contentinformationRequest];
BOOL didRespondCompletely = [self respondWithDataForRequest:loadingRequest.dataRequest];
if (didRespondCompletely)
{
[requestsCompleted addobject:loadingRequest];
[loadingRequest finishLoading];
}
}
[self.pendingRequests removeObjectsInArray:requestsCompleted];
}
- (void)fillInContentinformation:(AVAssetResourceLoadingContentinformationRequest *)contentinformationRequest
{
if (contentinformationRequest == nil || self.response == nil)
{
return;
}
Nsstring *mimeType = [self.response MIMEType];
CFStringRef contentType = UTTypeCreatePreferredIdentifierForTag(kUTTagClassMIMEType,(__bridge CFStringRef)(mimeType),NULL);
contentinformationRequest.byterangeAccessSupported = YES;
contentinformationRequest.contentType = CFBridgingrelease(contentType);
contentinformationRequest.contentLength = [self.response expectedContentLength];
}
- (BOOL)respondWithDataForRequest:(AVAssetResourceLoadingDataRequest *)dataRequest
{
long long startOffset = dataRequest.requestedOffset;
if (dataRequest.currentOffset != 0)
{
startOffset = dataRequest.currentOffset;
}
// Don't have any data at all for this request
if (self.videoData.length < startOffset)
{
NSLog(@"NO DATA FOR REQUEST");
return NO;
}
// This is the total data we have from startOffset to whatever has been downloaded so far
NSUInteger unreadBytes = self.videoData.length - (NSUInteger)startOffset;
// Respond with whatever is available if we can't satisfy the request fully yet
NSUInteger numberOfBytesToRespondWith = MIN((NSUInteger)dataRequest.requestedLength,unreadBytes);
[dataRequest respondWithData:[self.videoData subdataWithRange:NSMakeRange((NSUInteger)startOffset,numberOfBytesToRespondWith)]];
long long endOffset = startOffset + dataRequest.requestedLength;
BOOL didRespondFully = self.videoData.length >= endOffset;
return didRespondFully;
}
- (BOOL)resourceLoader:(AVAssetResourceLoader *)resourceLoader shouldWaitForLoadingOfRequestedResource:(AVAssetResourceLoadingRequest *)loadingRequest
{
if (self.connection == nil)
{
NSURL *interceptedURL = [loadingRequest.request URL];
NSURLComponents *actualURLComponents = [[NSURLComponents alloc] initWithURL:interceptedURL resolvingAgainstBaseURL:NO];
actualURLComponents.scheme = @"http";
NSURLRequest *request = [NSURLRequest requestWithURL:[actualURLComponents URL]];
self.connection = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:NO];
[self.connection setDelegateQueue:[NSOperationQueue mainQueue]];
[self.connection start];
}
[self.pendingRequests addobject:loadingRequest];
return YES;
}
- (void)resourceLoader:(AVAssetResourceLoader *)resourceLoader didCancelLoadingRequest:(AVAssetResourceLoadingRequest *)loadingRequest
{
NSLog(@"didCancelLoadingRequest");
[self.pendingRequests removeObject:loadingRequest];
}
/**
KVO
*/
- (void)observeValueForKeyPath:(Nsstring *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
if (context == StatusObservationContext)
{
AVPlayerStatus status = [[change objectForKey:NSkeyvalueChangeNewKey] integerValue];
if (status == AVPlayerStatusReadyToPlay) {
[self initHud];
[self play:NO];
} else if (status == AVPlayerStatusFailed)
{
NSLog(@"ERROR::AVPlayerStatusFailed");
} else if (status == AVPlayerItemStatusUnkNown)
{
NSLog(@"ERROR::AVPlayerItemStatusUnkNown");
}
} else if (context == CurrentItemObservationContext) {
} else if (context == RateObservationContext) {
} else if (context == BufferObservationContext){
} else if (context == playbackLikelyToKeepUp) {
if (self.player.currentItem.playbackLikelyToKeepUp)
}
} else if (context == playbackBufferEmpty) {
if (self.player.currentItem.playbackBufferEmpty)
{
NSLog(@"Video Asset is playable: %d",self.videoAsset.isPlayable);
NSLog(@"Player Item Status: %ld",self.player.currentItem.status);
NSLog(@"Connection Request: %@",self.connection.currentRequest);
NSLog(@"Video Data: %lu",(unsigned long)self.videoData.length);
}
} else if(context == playbackBufferFull) {
} else {
[super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
}
}
问题似乎是在连接完成加载后的某个时间,播放器项目缓冲区变空.我目前的想法是,当连接完成加载并弄坏了playerItem缓冲区时,正在释放某些东西.
然而,当缓冲区为空时,播放器的状态是好的,视频资源可以播放,视频数据是好的
如果我通过查询来限制WiFi,并减慢连接速度,只要连接在视频结束后几分钟内没有完成加载,视频就会播放.
如果我在完成的加载事件中设置了连接,那么当shouldWaitForLoadingOfRequestedResource再次触发时,资源加载器将启动一个新的连接.在这种情况下,装载将重新开始,视频将继续播放.
我应该提到,如果我将其作为普通的http网址资源播放,这个长长的视频播放效果很好,并且在保存到设备并从那里加载之后也会播放.
解决方法
当资源加载器委托启动NSURLConnection时,连接会将NSData保存到待处理的请求并处理它们.当连接完成加载时,资源加载器重新负责处理加载请求.该代码将加载请求添加到挂起的请求数组中,但问题是它们未被处理.将方法更改为以下功能,它的工作原理.
//AVAssetResourceLoader
- (BOOL)resourceLoader:(AVAssetResourceLoader *)resourceLoader shouldWaitForLoadingOfRequestedResource:(AVAssetResourceLoadingRequest *)loadingRequest
{
if(isLoadingComplete == YES)
{
//NSLog(@"LOADING WAS COMPLETE");
[self.pendingRequests addobject:loadingRequest];
[self processpendingRequests];
return YES;
}
if (self.connection == nil)
{
NSURL *interceptedURL = [loadingRequest.request URL];
NSURLComponents *actualURLComponents = [[NSURLComponents alloc] initWithURL:interceptedURL resolvingAgainstBaseURL:NO];
actualURLComponents.scheme = @"http";
self.request = [NSURLRequest requestWithURL:[actualURLComponents URL]];
self.connection = [[NSURLConnection alloc] initWithRequest:self.request delegate:self startImmediately:NO];
[self.connection setDelegateQueue:[NSOperationQueue mainQueue]];
isLoadingComplete = NO;
[self.connection start];
}
[self.pendingRequests addobject:loadingRequest];
return YES;
}
