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////////////////////////////////////////////////////////////////////////////
// **** WAVPACK **** //
// Hybrid Lossless Wavefile Compressor //
// Copyright (c) 1998 - 2004 Conifer Software. //
// All Rights Reserved. //
// Distributed under the BSD Software License (see license.txt) //
////////////////////////////////////////////////////////////////////////////
// float.c
#include "wavpack.h"
int read_float_info (WavpackStream *wps, WavpackMetadata *wpmd)
{
int bytecnt = wpmd->byte_length;
char *byteptr = wpmd->data;
if (bytecnt != 4)
return FALSE;
wps->float_flags = *byteptr++;
wps->float_shift = *byteptr++;
wps->float_max_exp = *byteptr++;
wps->float_norm_exp = *byteptr;
return TRUE;
}
/* This function converts WavPack floating point data into standard Rockbox
* 28-bit integers. It is assumed that clipping will be taken care of later.
*/
void float_values (WavpackStream *wps, int32_t *values, int32_t num_values)
{
int shift = wps->float_max_exp - wps->float_norm_exp + wps->float_shift + 5;
if (shift > 32)
shift = 32;
else if (shift < -32)
shift = -32;
if (shift > 0)
while (num_values--)
*values++ <<= shift;
else if (shift < 0)
while (num_values--)
*values++ >>= -shift;
}
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