92 lines
1.7 KiB
Objective-C
92 lines
1.7 KiB
Objective-C
//
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// WavPackFile.m
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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 "WavPackDecoder.h"
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@implementation WavPackDecoder
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- (BOOL)open:(NSURL *)url
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{
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int open_flags = 0;
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char error[80];
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wpc = WavpackOpenFileInput([[url path] UTF8String], error, open_flags, 0);
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if (!wpc)
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return NO;
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channels = WavpackGetNumChannels(wpc);
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bitsPerSample = WavpackGetBitsPerSample(wpc);
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frequency = WavpackGetSampleRate(wpc);
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length = ((double)WavpackGetNumSamples(wpc) * 1000.0)/frequency;
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bitrate = (int)(WavpackGetAverageBitrate(wpc, TRUE)/1000.0);
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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 numsamples;
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int n;
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void *sampleBuf = malloc(size*2);
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numsamples = size/(bitsPerSample/8)/channels;
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// DBLog(@"NUM SAMPLES: %i %i", numsamples, size);
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n = WavpackUnpackSamples(wpc, sampleBuf, numsamples);
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int i;
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for (i = 0; i < n*channels; i++)
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{
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((UInt16 *)buf)[i] = ((UInt32 *)sampleBuf)[i];
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}
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n *= (bitsPerSample/8)*channels;
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free(sampleBuf);
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return n;
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}
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- (double)seekToTime:(double)milliseconds
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{
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int sample;
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sample = frequency*(milliseconds/1000.0);
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WavpackSeekSample(wpc, sample);
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return milliseconds;
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}
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- (void)close
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{
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WavpackCloseFile(wpc);
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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 numberWithInt:bitrate],@"bitrate",
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[NSNumber numberWithFloat:frequency],@"sampleRate",
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[NSNumber numberWithDouble:length],@"length",
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@"host",@"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:@"wv"];
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}
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@end
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