diff options
| author | Magnus Auvinen <magnus.auvinen@gmail.com> | 2007-08-22 07:52:33 +0000 |
|---|---|---|
| committer | Magnus Auvinen <magnus.auvinen@gmail.com> | 2007-08-22 07:52:33 +0000 |
| commit | 8b3c16e6152a527f9aec1a88a9eed74119de7000 (patch) | |
| tree | f0bde5cea15e696e42cade06a3b12ff6b13acc57 /src/engine/external/wavpack/float.c | |
| parent | 9899666a7ce6679a3b9667ab09f615f4d0769c16 (diff) | |
| download | zcatch-8b3c16e6152a527f9aec1a88a9eed74119de7000.tar.gz zcatch-8b3c16e6152a527f9aec1a88a9eed74119de7000.zip | |
major engine cleanup. dependency on baselib removed. engine is now C code (not ansi tho). some other cruft removed aswell
Diffstat (limited to 'src/engine/external/wavpack/float.c')
| -rw-r--r-- | src/engine/external/wavpack/float.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/src/engine/external/wavpack/float.c b/src/engine/external/wavpack/float.c new file mode 100644 index 00000000..4b9b44ee --- /dev/null +++ b/src/engine/external/wavpack/float.c @@ -0,0 +1,50 @@ +//////////////////////////////////////////////////////////////////////////// +// **** WAVPACK **** // +// Hybrid Lossless Wavefile Compressor // +// Copyright (c) 1998 - 2006 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; +} + +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; + + if (shift > 32) + shift = 32; + else if (shift < -32) + shift = -32; + + while (num_values--) { + if (shift > 0) + *values <<= shift; + else if (shift < 0) + *values >>= -shift; + + if (*values > 8388607L) + *values = 8388607L; + else if (*values < -8388608L) + *values = -8388608L; + + values++; + } +} |