cog/Plugins/APL/APLDecoder.m

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#import "APLDecoder.h"
#import "APLFile.h"
#import "Logging.h"
@implementation APLDecoder
+ (NSArray *)fileTypes {
return @[@"apl"];
}
+ (NSArray *)mimeTypes {
return @[@"application/x-apl"];
}
+ (float)priority {
return 1.0;
}
+ (NSArray *)fileTypeAssociations {
return @[
@[@"APL Link File", @"song.icns", @"apl"]
];
}
- (NSDictionary *)properties {
NSMutableDictionary *properties = [[decoder properties] mutableCopy];
// Need to alter length
[properties setObject:@(trackLength) forKey:@"totalFrames"];
return [NSDictionary dictionaryWithDictionary:properties];
}
- (NSDictionary *)metadata {
return @{};
}
- (BOOL)open:(id<CogSource>)s {
// DLog(@"Loading apl...");
if(![[s url] isFileURL])
return NO;
NSURL *url = [s url];
apl = [APLFile createWithFile:[url path]];
// Kind of a hackish way of accessing outside classes.
source = [NSClassFromString(@"AudioSource") audioSourceForURL:[apl file]];
if(![source open:[apl file]]) {
ALog(@"Could not open source for file '%@' referenced in apl", [apl file]);
return NO;
}
decoder = [NSClassFromString(@"AudioDecoder") audioDecoderForSource:source skipCue:YES];
if(![decoder open:source]) {
ALog(@"Could not open decoder for source for apl");
return NO;
}
NSDictionary *properties = [decoder properties];
int bitsPerSample = [[properties objectForKey:@"bitsPerSample"] intValue];
int channels = [[properties objectForKey:@"channels"] intValue];
// float sampleRate = [[properties objectForKey:@"sampleRate"] floatValue];
bytesPerFrame = (bitsPerSample / 8) * channels;
if([apl endBlock] > [apl startBlock])
trackEnd = [apl endBlock]; //([apl endBlock] / sampleRate) * 1000.0;
else
trackEnd = [[properties objectForKey:@"totalFrames"] doubleValue]; //!!? double?
trackStart = [apl startBlock];
trackLength = trackEnd - trackStart;
[self seek:0];
// Note: Should register for observations of the decoder, but laziness consumes all.
[self willChangeValueForKey:@"properties"];
[self didChangeValueForKey:@"properties"];
return YES;
}
- (void)close {
if(decoder) {
[decoder close];
decoder = nil;
}
source = nil;
apl = nil;
}
- (void)dealloc {
[self close];
}
- (long)seek:(long)frame {
if(frame > trackEnd - trackStart) {
// need a better way of returning fail.
return -1;
}
frame += trackStart;
framePosition = [decoder seek:frame];
return framePosition;
}
- (int)readAudio:(void *)buf frames:(UInt32)frames {
if(framePosition + frames > trackEnd)
frames = (UInt32)(trackEnd - framePosition);
if(!frames) {
DLog(@"APL readAudio Returning 0");
return 0;
}
int n = [decoder readAudio:buf frames:frames];
framePosition += n;
return n;
}
- (BOOL)isSilence {
if([decoder respondsToSelector:@selector(isSilence)])
return [decoder isSilence];
return NO;
}
@end