124 lines
2.3 KiB
Plaintext
124 lines
2.3 KiB
Plaintext
//
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// ShnFile.mm
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// Cog
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//
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// Created by Vincent Spader on 6/6/05.
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// Copyright 2005 Vincent Spader All rights reserved.
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//
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#import "ShortenDecoder.h"
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@implementation ShortenDecoder
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- (BOOL)open:(id<CogSource>)source
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{
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NSURL *url = [source url];
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if (![[url scheme] isEqualToString:@"file"])
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return NO;
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[source close];
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decoder = new shn_reader;
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if (!decoder)
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{
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return NO;
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}
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decoder->open([[url path] UTF8String], true);
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bufferSize = decoder->shn_get_buffer_block_size(NUM_DEFAULT_BUFFER_BLOCKS);
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bool seekTable;
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decoder->file_info(NULL, &channels, &frequency, NULL, &bitsPerSample, &seekTable);
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seekable = seekTable == true ? YES : NO;
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length = decoder->shn_get_song_length();
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decoder->go();
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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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- (int)fillBuffer:(void *)buf ofSize:(UInt32)size
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{
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long totalRead, amountRead, amountToRead;
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totalRead = 0;
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//For some reason the busy loop is causing pops when output is set to 48000. Probably CPU starvation, since the SHN decoder seems to use a multithreaded approach.
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// while (totalRead < size) {
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amountToRead = size - totalRead;
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if (amountToRead > bufferSize) {
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amountToRead = bufferSize;
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}
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do
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{
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amountRead = decoder->read(buf, amountToRead);
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} while(amountRead == -1 && totalRead == 0);
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// if (amountRead <= 0) {
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// return totalRead;
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// }
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totalRead += amountRead;
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// buf = (void *)((char *)buf + amountRead);
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// }
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return totalRead;
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}
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- (double)seekToTime:(double)milliseconds
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{
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unsigned int sec;
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/*if (!shn_seekable(handle))
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return -1.0;*/
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sec = (int)(milliseconds/1000.0);
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//shn_seek(handle, sec);
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decoder->seek(sec);
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return (sec * 1000.0);
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}
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- (void)close
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{
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if(decoder)
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{
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decoder->exit();
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delete decoder;
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decoder = NULL;
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}
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/*if (shn_cleanup_decoder(handle))
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shn_unload(handle);*/
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}
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- (NSDictionary *)properties
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{
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return [NSDictionary dictionaryWithObjectsAndKeys:
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[NSNumber numberWithInt:channels],@"channels",
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[NSNumber numberWithInt:bitsPerSample],@"bitsPerSample",
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[NSNumber numberWithFloat:frequency],@"sampleRate",
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[NSNumber numberWithDouble:length],@"length",
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[NSNumber numberWithBool:seekable ],@"seekable",
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@"little",@"endian",
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nil];
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}
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+ (NSArray *)fileTypes
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{
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return [NSArray arrayWithObject:@"shn"];
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}
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@end
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