cog/Plugins/WavPack/WavPackDecoder.m

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//
// WavPackFile.m
// Cog
//
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// Created by Vincent Spader on 6/6/05.
// Copyright 2005 Vincent Spader All rights reserved.
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//
#import "WavPackDecoder.h"
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#import "Logging.h"
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@implementation WavPackDecoder
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int32_t ReadBytesProc(void *ds, void *data, int32_t bcount)
{
WavPackDecoder *decoder = (WavPackDecoder *)ds;
return [[decoder source] read:data amount:bcount];
}
uint32_t GetPosProc(void *ds)
{
WavPackDecoder *decoder = (WavPackDecoder *)ds;
return [[decoder source] tell];
}
int SetPosAbsProc(void *ds, uint32_t pos)
{
WavPackDecoder *decoder = (WavPackDecoder *)ds;
return ([[decoder source] seek:pos whence:SEEK_SET] ? 0: -1);
}
int SetPosRelProc(void *ds, int32_t delta, int mode)
{
WavPackDecoder *decoder = (WavPackDecoder *)ds;
return ([[decoder source] seek:delta whence:mode] ? 0: -1);
}
int PushBackByteProc(void *ds, int c)
{
WavPackDecoder *decoder = (WavPackDecoder *)ds;
if ([[decoder source] seekable]) {
[[decoder source] seek:-1 whence:SEEK_CUR];
return c;
}
else {
return -1;
}
}
uint32_t GetLengthProc(void *ds)
{
WavPackDecoder *decoder = (WavPackDecoder *)ds;
if ([[decoder source] seekable]) {
long currentPos = [[decoder source] tell];
[[decoder source] seek:0 whence:SEEK_END];
long size = [[decoder source] tell];
[[decoder source] seek:currentPos whence:SEEK_SET];
return size;
}
else {
return 0;
}
}
int CanSeekProc(void *ds)
{
WavPackDecoder *decoder = (WavPackDecoder *)ds;
return [[decoder source] seekable];
}
int32_t WriteBytesProc(void *ds, void *data, int32_t bcount)
{
return -1;
}
- (BOOL)open:(id<CogSource>)s
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{
int open_flags = 0;
char error[80];
[self setSource:s];
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reader.read_bytes = ReadBytesProc;
reader.get_pos = GetPosProc;
reader.set_pos_abs = SetPosAbsProc;
reader.set_pos_rel = SetPosRelProc;
reader.push_back_byte = PushBackByteProc;
reader.get_length = GetLengthProc;
reader.can_seek = CanSeekProc;
reader.write_bytes = WriteBytesProc;
//No corrections file (WVC) support at the moment.
wpc = WavpackOpenFileInputEx(&reader, self, NULL, error, open_flags, 0);
if (!wpc) {
DLog(@"Unable to open file..");
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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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totalFrames = WavpackGetNumSamples(wpc);
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bitrate = (int)(WavpackGetAverageBitrate(wpc, TRUE)/1000.0);
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[self willChangeValueForKey:@"properties"];
[self didChangeValueForKey:@"properties"];
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return YES;
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}
/*
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- (int)fillBuffer:(void *)buf ofSize:(UInt32)size
{
int numsamples;
int n;
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void *sampleBuf = malloc(size*2);
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numsamples = size/(bitsPerSample/8)/channels;
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;
}
*/
- (int)readAudio:(void *)buf frames:(UInt32)frames
{
uint32_t sample;
int32_t audioSample;
uint32_t samplesRead;
int8_t *alias8;
int16_t *alias16;
int32_t *alias32;
int32_t *inputBuffer = malloc(frames*sizeof(int32_t));
// Wavpack uses "complete" samples (one sample across all channels), i.e. a Core Audio frame
samplesRead = WavpackUnpackSamples(wpc, inputBuffer, frames/channels);
// Handle floating point files
// Perform hard clipping and convert to integers
if(MODE_FLOAT & WavpackGetMode(wpc) && 127 == WavpackGetFloatNormExp(wpc)) {
float f;
alias32 = inputBuffer;
for(sample = 0; sample < samplesRead * channels; ++sample) {
f = * ((float *) alias32);
if(f > 1.0) { f = 1.0; }
if(f < -1.0) { f = -1.0; }
*alias32++ = (int32_t) (f * 2147483647.0);
}
}
switch(bitsPerSample) {
case 8:
// No need for byte swapping
alias8 = buf;
for(sample = 0; sample < samplesRead * channels; ++sample) {
*alias8++ = (int8_t)inputBuffer[sample];
}
break;
case 16:
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// Convert to little endian byte order
alias16 = buf;
for(sample = 0; sample < samplesRead*channels; ++sample) {
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*alias16++ = OSSwapHostToLittleInt16((int16_t)inputBuffer[sample]);
}
break;
case 24:
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// Convert to little endian byte order
alias8 = buf;
for(sample = 0; sample < samplesRead * channels; ++sample) {
audioSample = inputBuffer[sample];
*alias8++ = (int8_t)audioSample;
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*alias8++ = (int8_t)(audioSample >> 8);
*alias8++ = (int8_t)(audioSample >> 16);
}
break;
case 32:
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// Convert to little endian byte order
alias32 = buf;
for(sample = 0; sample < samplesRead * channels; ++sample) {
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*alias32++ = OSSwapHostToLittleInt32(inputBuffer[sample]);
}
break;
default:
ALog(@"Unsupported sample size: %d", bitsPerSample);
}
free(inputBuffer);
return samplesRead;
}
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- (long)seek:(long)frame
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{
WavpackSeekSample(wpc, frame);
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return frame;
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}
- (void)close
{
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[source release];
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WavpackCloseFile(wpc);
}
- (void)setSource:(id<CogSource>)s
{
[s retain];
[source release];
source = s;
}
- (id<CogSource>)source
{
return source;
}
- (NSDictionary *)properties
{
return [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithInt:channels],@"channels",
[NSNumber numberWithInt:bitsPerSample],@"bitsPerSample",
[NSNumber numberWithInt:bitrate],@"bitrate",
[NSNumber numberWithFloat:frequency],@"sampleRate",
[NSNumber numberWithDouble:totalFrames],@"totalFrames",
[NSNumber numberWithBool:[source seekable]], @"seekable",
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@"little",@"endian",
nil];
}
+ (NSArray *)fileTypes
{
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return [NSArray arrayWithObjects:@"wv", @"wvp", nil];
}
+ (NSArray *)mimeTypes
{
return [NSArray arrayWithObjects:@"audio/x-wavpack", nil];
}
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@end