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AssetLoaderDelegate.m
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AssetLoaderDelegate.m
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//
// AssetLoaderDelegate.m
// TimeTag
//
// Created by Renjith N on 23/02/15.
// Copyright (c) 2015 MBP1. All rights reserved.
//
#import "AssetLoaderDelegate.h"
#import <AVFoundation/AVFoundation.h>
#import <MobileCoreServices/MobileCoreServices.h>
@implementation AssetLoaderDelegate
- (id)init{
if (self = [super init]) {
self.cacheDir = [AssetLoaderDelegate cacheDirectory];
self.pendingRequests = [NSMutableArray array];
}
return self;
}
#pragma mark - NSURLConnection delegate
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
self.movieData = [NSMutableData data];
self.response = (NSHTTPURLResponse *)response;
[self processPendingRequests];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
[self.movieData appendData:data];
[self processPendingRequests];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection{
[self processPendingRequests];
NSLog(@"Download complete");
NSString *fileName = [NSURL URLWithString:self.fileUrl].absoluteString.lastPathComponent;
NSString *cachedFilePath = [[NSString alloc] initWithFormat:@"%@/%@",self.cacheDir,[fileName componentsSeparatedByString:@"?"].firstObject];
BOOL writen = [self.movieData writeToFile:cachedFilePath atomically:YES];
if(!writen){
NSLog(@"Error");
}
}
#pragma mark - AVURLAsset resource loading
- (void)processPendingRequests{
NSLog(@"processPendingRequests:%lu",(unsigned long)self.pendingRequests.count);
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.movieData.length < startOffset){
return NO;
}
// This is the total data we have from startOffset to whatever has been downloaded so far
NSUInteger unreadBytes = self.movieData.length - (NSUInteger)startOffset;
// Respond with whatever is available if we can't satisfy the request fully yet
NSUInteger numberOfBytesToRespondWith = MIN((NSUInteger)dataRequest.requestedLength, unreadBytes);
NSLog(@"data:%lu,,,(%lld,%lu)",(unsigned long)self.movieData.length,startOffset,(unsigned long)numberOfBytesToRespondWith);
[dataRequest respondWithData:[self.movieData subdataWithRange:NSMakeRange((NSUInteger)startOffset, numberOfBytesToRespondWith)]];
long long endOffset = startOffset + dataRequest.requestedLength;
BOOL didRespondFully = self.movieData.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 = @"https";
NSURLRequest *request = [NSURLRequest requestWithURL:[actualURLComponents URL]];
self.connection = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:NO];
[self.connection setDelegateQueue:[NSOperationQueue mainQueue]];
[self.connection start];
}
NSLog(@"pendingRequests:%@",loadingRequest);
[self.pendingRequests addObject:loadingRequest];
[self processPendingRequests];
return YES;
}
- (void)resourceLoader:(AVAssetResourceLoader *)resourceLoader didCancelLoadingRequest:(AVAssetResourceLoadingRequest *)loadingRequest{
[self.pendingRequests removeObject:loadingRequest];
}
+ (NSString*) preViewFoundInCacheDirectory:(NSString*) url{
NSString *fileName = [NSURL URLWithString:url].absoluteString.lastPathComponent;
NSString *cachedFilePath = [[NSString alloc] initWithFormat:@"%@/%@",[AssetLoaderDelegate cacheDirectory],[fileName componentsSeparatedByString:@"?"].firstObject];
if([[NSFileManager defaultManager] fileExistsAtPath:cachedFilePath]){
return cachedFilePath;
}
else{
return nil;
}
}
+ (NSString *)cacheDirectory{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *cacheDir = [paths objectAtIndex:0];
NSString *videoCacheDir = [NSString stringWithFormat:@"%@/%@",cacheDir,@"Previews"];
BOOL isDir = NO;
NSError *error;
if (! [[NSFileManager defaultManager] fileExistsAtPath:videoCacheDir isDirectory:&isDir] && isDir == NO) {
[[NSFileManager defaultManager] createDirectoryAtPath:videoCacheDir withIntermediateDirectories:YES attributes:nil error:&error];
}
return videoCacheDir;
}
@end