cog/Audio/CogPluginMulti.m

188 lines
5.3 KiB
Objective-C

//
// CogPluginMulti.m
// CogAudio
//
// Created by Christopher Snowhill on 10/21/13.
//
//
#import "CogPluginMulti.h"
NSArray *sortClassesByPriority(NSArray *theClasses) {
NSMutableArray *sortedClasses = [NSMutableArray arrayWithArray:theClasses];
[sortedClasses sortUsingComparator:
^NSComparisonResult(id obj1, id obj2) {
NSString *classString1 = (NSString *)obj1;
NSString *classString2 = (NSString *)obj2;
Class class1 = NSClassFromString(classString1);
Class class2 = NSClassFromString(classString2);
float priority1 = [class1 priority];
float priority2 = [class2 priority];
if(priority1 == priority2)
return NSOrderedSame;
else if(priority1 > priority2)
return NSOrderedAscending;
else
return NSOrderedDescending;
}];
return sortedClasses;
}
@implementation CogDecoderMulti
+ (NSArray *)mimeTypes {
return nil;
}
+ (NSArray *)fileTypes {
return nil;
}
+ (float)priority {
return -1.0;
}
+ (NSArray *)fileTypeAssociations {
return nil;
}
- (id)initWithDecoders:(NSArray *)decoders {
self = [super init];
if(self) {
theDecoders = sortClassesByPriority(decoders);
theDecoder = nil;
cachedObservers = [[NSMutableArray alloc] init];
}
return self;
}
- (NSDictionary *)properties {
if(theDecoder != nil) return [theDecoder properties];
return nil;
}
- (int)readAudio:(void *)buffer frames:(UInt32)frames {
if(theDecoder != nil) return [theDecoder readAudio:buffer frames:frames];
return 0;
}
- (BOOL)open:(id<CogSource>)source {
for(NSString *classString in theDecoders) {
Class decoder = NSClassFromString(classString);
theDecoder = [[decoder alloc] init];
for(NSDictionary *obsItem in cachedObservers) {
[theDecoder addObserver:[obsItem objectForKey:@"observer"]
forKeyPath:[obsItem objectForKey:@"keyPath"]
options:[[obsItem objectForKey:@"options"] unsignedIntegerValue]
context:(__bridge void *)([obsItem objectForKey:@"context"])];
}
if([theDecoder open:source])
return YES;
for(NSDictionary *obsItem in cachedObservers) {
[theDecoder removeObserver:[obsItem objectForKey:@"observer"] forKeyPath:[obsItem objectForKey:@"keyPath"]];
}
if([source seekable])
[source seek:0 whence:SEEK_SET];
}
theDecoder = nil;
return NO;
}
- (long)seek:(long)frame {
if(theDecoder != nil) return [theDecoder seek:frame];
return -1;
}
- (void)close {
if(theDecoder != nil) {
for(NSDictionary *obsItem in cachedObservers) {
[theDecoder removeObserver:[obsItem objectForKey:@"observer"] forKeyPath:[obsItem objectForKey:@"keyPath"]];
}
[cachedObservers removeAllObjects];
[theDecoder close];
theDecoder = nil;
}
}
- (BOOL)setTrack:(NSURL *)track {
if(theDecoder != nil && [theDecoder respondsToSelector:@selector(setTrack:)]) return [theDecoder setTrack:track];
return NO;
}
/* By the current design, the core adds its observers to decoders before they are opened */
- (void)addObserver:(NSObject *)observer forKeyPath:(NSString *)keyPath options:(NSKeyValueObservingOptions)options context:(void *)context {
if(context != nil) {
[cachedObservers addObject:[NSDictionary dictionaryWithObjectsAndKeys:observer, @"observer", keyPath, @"keyPath", @(options), @"options", context, @"context", nil]];
} else {
[cachedObservers addObject:[NSDictionary dictionaryWithObjectsAndKeys:observer, @"observer", keyPath, @"keyPath", @(options), @"options", nil]];
}
if(theDecoder) {
[theDecoder addObserver:observer forKeyPath:keyPath options:options context:context];
}
}
/* And this is currently called after the decoder is closed */
- (void)removeObserver:(NSObject *)observer forKeyPath:(NSString *)keyPath {
for(NSDictionary *obsItem in cachedObservers) {
if([obsItem objectForKey:@"observer"] == observer && [keyPath isEqualToString:[obsItem objectForKey:@"keyPath"]]) {
[cachedObservers removeObject:obsItem];
break;
}
}
if(theDecoder) {
[theDecoder removeObserver:observer forKeyPath:keyPath];
}
}
@end
@implementation CogContainerMulti
+ (NSArray *)urlsForContainerURL:(NSURL *)url containers:(NSArray *)containers {
NSArray *sortedContainers = sortClassesByPriority(containers);
for(NSString *classString in sortedContainers) {
Class container = NSClassFromString(classString);
NSArray *urls = [container urlsForContainerURL:url];
if([urls count])
return urls;
}
return nil;
}
@end
@implementation CogMetadataReaderMulti
+ (NSDictionary *)metadataForURL:(NSURL *)url readers:(NSArray *)readers {
NSArray *sortedReaders = sortClassesByPriority(readers);
for(NSString *classString in sortedReaders) {
Class reader = NSClassFromString(classString);
NSDictionary *data = [reader metadataForURL:url];
if([data count])
return data;
}
return nil;
}
@end
@implementation CogPropertiesReaderMulti
+ (NSDictionary *)propertiesForSource:(id<CogSource>)source readers:(NSArray *)readers {
NSArray *sortedReaders = sortClassesByPriority(readers);
for(NSString *classString in sortedReaders) {
Class reader = NSClassFromString(classString);
NSDictionary *data = [reader propertiesForSource:source];
if([data count])
return data;
if([source seekable])
[source seek:0 whence:SEEK_SET];
}
return nil;
}
@end