95 lines
1.8 KiB
Mathematica
95 lines
1.8 KiB
Mathematica
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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 "CueSheetDecoder.h"
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#import "CueSheet.h"
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#import "CueSheetTrack.h"
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@implementation CueSheetDecoder
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+ (NSArray *)fileTypes
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{
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return [NSArray arrayWithObject:@"cue"];
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}
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- (NSDictionary *)properties
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{
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return [decoder properties];
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}
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- (BOOL)open:(id<CogSource>)source
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{
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//Kind of a hackish way of accessing AudioDecoder
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decoder = [NSClassFromString(@"AudioDecoder") audioDecoderForURL:[source url]];
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[decoder retain];
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BOOL r = [decoder open:source];
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if (r)
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{
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CueSheet *cuesheet = [CueSheet cueSheetWithFile:[[source url] path]];
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track = [cuesheet track:[[source url] fragment]];
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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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bytesPerSecond = (int)((bitsPerSample/8) * channels * sampleRate);
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[decoder seekToTime: [track start] * 1000.0];
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}
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return r;
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}
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- (double)seekToTime:(double)time //milliseconds
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{
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double trackStartMs = [track start] * 1000.0;
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double trackEndMs = [track end] * 1000.0;
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if (time > trackEndMs - trackStartMs) {
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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 += trackStartMs;
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trackPosition = (time/1000.0) * bytesPerSecond;
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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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int n;
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n = [decoder fillBuffer:buf ofSize:size];
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trackPosition += n;
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int trackEnd = [track end] * bytesPerSecond;
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if (trackPosition + n > trackEnd) {
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return trackEnd - trackPosition;
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}
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return n;
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}
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- (void)dealloc
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{
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[decoder release];
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[super dealloc];
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}
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@end
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