116 lines
2.0 KiB
Objective-C
116 lines
2.0 KiB
Objective-C
//
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// ShnFile.m
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// Cog
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//
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// Created by Zaphod Beeblebrox on 6/6/05.
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// Copyright 2005 __MyCompanyName__. All rights reserved.
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//
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#import "ShnFile.h"
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@implementation ShnFile
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- (BOOL)open:(const char *)filename
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{
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BOOL r;
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r = [self readInfo:filename];
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if (!r)
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return NO;
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bufferSize = shn_get_buffer_block_size(handle, 512);
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buffer = malloc(bufferSize);
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return YES;
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}
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- (BOOL)readInfo:(const char *)filename
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{
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shn_config conf;
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int r;
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conf.error_output_method = ERROR_OUTPUT_DEVNULL;
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conf.seek_tables_path = NULL;
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conf.relative_seek_tables_path = ".";
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conf.verbose = 0;
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conf.swap_bytes = 0;
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handle = shn_load((char *)filename, conf);
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if (!handle)
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return NO;
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r = shn_init_decoder(handle);
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if (r < 0)
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return NO;
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channels = shn_get_channels(handle);
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frequency = shn_get_samplerate(handle);
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bitsPerSample = shn_get_bitspersample(handle);
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unsigned int length;
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length = shn_get_song_length(handle);
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totalSize = (((double)(length)*frequency)/1000.0) * channels * (bitsPerSample/8);
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bitRate = (int)((double)totalSize/((double)length/1000.0));
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DBLog(@"Bitrate; %i", bitRate);
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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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int numread = bufferAmount;
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int count = 0;
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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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if (bufferAmount == 0)
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return 0;
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}
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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, &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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return (sec * 1000.0);
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}
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- (void)close
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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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@end
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