cog/Audio/CogPluginMulti.m

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//
// 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;
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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 ) {
[theDecoder close];
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for (NSDictionary *obsItem in cachedObservers) {
[theDecoder removeObserver:[obsItem objectForKey:@"observer"] forKeyPath:[obsItem objectForKey:@"keyPath"]];
}
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];
}
}
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/* 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];
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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