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