159 lines
2.7 KiB
Plaintext
159 lines
2.7 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 "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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if ([self readInfo:filename] == NO)
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return NO;
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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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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(filename, true);
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bufferSize = decoder->shn_get_buffer_block_size(512);
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buffer = malloc(bufferSize);
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unsigned int length;
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int chan;
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float freq;
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int bps;
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decoder->file_info(NULL, &chan, &freq, NULL, &bps, NULL);
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/*NSLog(@"chan: %d",chan);
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NSLog(@"freq: %f",freq);
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NSLog(@"bps: %d",bps);*/
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channels = chan;
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frequency = (int)freq;
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bitsPerSample = bps;
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/*NSLog(@"channels: %d",channels);
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NSLog(@"frequency: %f",(double)frequency);
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NSLog(@"bitsPerSample: %d",bitsPerSample);*/
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length = decoder->shn_get_song_length();
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//NSLog(@"length: %d",length);
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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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/*NSLog(@"totalSize: %d",totalSize);
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NSLog(@"bitRate: %d",bitRate);*/
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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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@end
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