146 lines
2.5 KiB
Plaintext
146 lines
2.5 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:(NSURL *)url
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{
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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(512);
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buffer = malloc(bufferSize);
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decoder->file_info(NULL, &channels, &frequency, NULL, &bitsPerSample, NULL);
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length = decoder->shn_get_song_length();
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decoder->go();
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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 numread = bufferAmount;
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//long count = 0;
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long numread, count;
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bufferAmount = 0;
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inputBuffer = malloc(bufferSize);
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//Fill from buffer, going by bufferAmount
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//if still needs more, decode and repeat
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if (bufferAmount == 0)
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{
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//bufferAmount = shn_read(handle, buffer, bufferSize);
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while((bufferAmount = decoder->read(inputBuffer, bufferSize)) == (unsigned)(-1))
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{
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bufferAmount = decoder->read(inputBuffer, bufferSize);
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}
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if (bufferAmount == 0)
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return 0;
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else if(bufferAmount == (unsigned)( -2))
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{
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//NSLog(@"closing file, eof");
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return -2;
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}
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else
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{
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memcpy(buffer, inputBuffer, bufferAmount);
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free(inputBuffer);
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}
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}
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//NSLog(@"bufferAmount: %d",bufferAmount);
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count = bufferAmount;
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if (bufferAmount > size)
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{
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count = size;
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}
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memcpy(buf, buffer, count);
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bufferAmount -= count;
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if (bufferAmount > 0)
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memmove(buffer, (&((char *)buffer)[count]), bufferAmount);
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if (count < size)
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numread = [self fillBuffer:(&((char *)buf)[count]) ofSize:(size - count)];
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else
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numread = 0;
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return count + numread;
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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 (buffer)
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{
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free(buffer);
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buffer = 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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@"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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