cog/Sound/SoundFile/WavPackFile.m

84 lines
1.4 KiB
Objective-C

//
// WavPackFile.m
// Cog
//
// Created by Vincent Spader on 6/6/05.
// Copyright 2005 Vincent Spader All rights reserved.
//
#import "WavPackFile.h"
@implementation WavPackFile
- (BOOL)open:(const char *)filename
{
int open_flags = 0;
char error[80];
wpc = WavpackOpenFileInput(filename, error, open_flags, 0);
if (!wpc)
return NO;
channels = WavpackGetNumChannels(wpc);
// bitsPerSample = WavpackGetBitsPerSample(wpc);
bitsPerSample = 32;
frequency = WavpackGetSampleRate(wpc);
int samples;
samples = WavpackGetNumSamples(wpc);
totalSize = samples * channels * 4;
bitRate = (int)(WavpackGetAverageBitrate(wpc, TRUE)/1000.0);
//isBigEndian = YES;
return YES;
}
- (BOOL)readInfo:(const char *)filename
{
[self open:filename]; //does the same damn thing
return YES;
}
- (int)fillBuffer:(void *)buf ofSize:(UInt32)size
{
int numsamples;
int n;
numsamples = size/4/channels;
// DBLog(@"NUM SAMPLES: %i %i", numsamples, size);
n = WavpackUnpackSamples(wpc, buf, numsamples);
n *= 4*channels;
int i;
for (i = 0; i < n/2; i++)
{
// ((UInt32 *)buf)[i] = CFSwapInt32LittleToHost(((UInt32 *)buf)[i]);
((UInt16 *)buf)[i] = CFSwapInt16LittleToHost(((UInt16 *)buf)[i]);
}
return n;
}
- (double)seekToTime:(double)milliseconds
{
int sample;
sample = (frequency/2)*(milliseconds/1000.0);
WavpackSeekSample(wpc, sample);
return milliseconds;
}
- (void)close
{
WavpackCloseFile(wpc);
}
@end