137 lines
3.0 KiB
Objective-C
137 lines
3.0 KiB
Objective-C
//
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// CueSheetDecoder.m
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// CueSheet
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//
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// Created by Zaphod Beeblebrox on 10/8/07.
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// Copyright 2007 __MyCompanyName__. All rights reserved.
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//
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#import "APLDecoder.h"
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#import "APLFile.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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- (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 numberWithDouble:trackLength] forKey:@"length"];
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return [properties autorelease];
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}
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- (BOOL)open:(id<CogSource>)s
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{
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NSLog(@"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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[s close];
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apl = [APLFile createWithFile:[url path]];
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[apl retain];
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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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[source retain];
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if (![source open:[apl file]]) {
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NSLog(@"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];
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[decoder retain];
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if (![decoder open:source]) {
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NSLog(@"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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bytesPerSecond = (int)(bytesPerFrame * sampleRate);
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if ([apl endBlock] > [apl startBlock])
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trackEnd = ([apl endBlock] / sampleRate) * 1000.0;
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else
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trackEnd = [[properties objectForKey:@"length"] doubleValue];
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trackStart = ([apl startBlock]/sampleRate) * 1000.0;
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trackLength = trackEnd - trackStart;
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[self seekToTime: 0.0];
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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 release];
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decoder = nil;
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}
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if (source) {
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[source release];
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source = nil;
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}
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if (apl) {
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[apl release];
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apl = nil;
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}
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}
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- (double)seekToTime:(double)time //milliseconds
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{
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if (time > trackLength || time < 0) {
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//need a better way of returning fail.
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return -1.0;
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}
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time += trackStart;
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bytePosition = (time/1000.0) * bytesPerSecond;
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NSLog(@"Before: %li", bytePosition);
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bytePosition -= bytePosition % bytesPerFrame;
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NSLog(@"After: %li", bytePosition);
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return [decoder seekToTime:time];
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}
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- (int)fillBuffer:(void *)buf ofSize:(UInt32)size
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{
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long trackByteEnd = (trackEnd/1000.0) * bytesPerSecond;
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trackByteEnd -= trackByteEnd % (bytesPerFrame);
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if (bytePosition + size > trackByteEnd)
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size = trackByteEnd - bytePosition;
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if (!size)
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return 0;
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int n = [decoder fillBuffer:buf ofSize:size];
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bytePosition += n;
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return n;
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}
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@end
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