2446b22db9
playback of floating-point audio files, fixes a obscure decoding bug, and improves encoding speed somewhat. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@11944 a1c6a512-1295-4272-9138-f99709370657
47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
////////////////////////////////////////////////////////////////////////////
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// **** WAVPACK **** //
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// Hybrid Lossless Wavefile Compressor //
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// Copyright (c) 1998 - 2004 Conifer Software. //
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// All Rights Reserved. //
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// Distributed under the BSD Software License (see license.txt) //
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////////////////////////////////////////////////////////////////////////////
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// float.c
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#include "wavpack.h"
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int read_float_info (WavpackStream *wps, WavpackMetadata *wpmd)
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{
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int bytecnt = wpmd->byte_length;
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char *byteptr = wpmd->data;
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if (bytecnt != 4)
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return FALSE;
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wps->float_flags = *byteptr++;
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wps->float_shift = *byteptr++;
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wps->float_max_exp = *byteptr++;
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wps->float_norm_exp = *byteptr;
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return TRUE;
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}
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/* This function converts WavPack floating point data into standard Rockbox
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* 28-bit integers. It is assumed that clipping will be taken care of later.
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*/
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void float_values (WavpackStream *wps, int32_t *values, int32_t num_values)
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{
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int shift = wps->float_max_exp - wps->float_norm_exp + wps->float_shift + 5;
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if (shift > 32)
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shift = 32;
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else if (shift < -32)
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shift = -32;
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if (shift > 0)
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while (num_values--)
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*values++ <<= shift;
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else if (shift < 0)
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while (num_values--)
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*values++ >>= -shift;
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}
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