mirror of
https://github.com/ZDoom/qzdoom.git
synced 2024-11-14 16:41:07 +00:00
97 lines
3.7 KiB
C
97 lines
3.7 KiB
C
/* libFLAC - Free Lossless Audio Codec library
|
|
* Copyright (C) 2004,2005 Josh Coalson
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* - Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
*
|
|
* - Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* - Neither the name of the Xiph.org Foundation nor the names of its
|
|
* contributors may be used to endorse or promote products derived from
|
|
* this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
|
|
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
|
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
|
|
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
|
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef FLAC__PRIVATE__FLOAT_H
|
|
#define FLAC__PRIVATE__FLOAT_H
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include <config.h>
|
|
#endif
|
|
|
|
#include "FLAC/ordinals.h"
|
|
|
|
/*
|
|
* These typedefs make it easier to ensure that integer versions of
|
|
* the library really only contain integer operations. All the code
|
|
* in libFLAC should use FLAC__float and FLAC__double in place of
|
|
* float and double, and be protected by checks of the macro
|
|
* FLAC__INTEGER_ONLY_LIBRARY.
|
|
*
|
|
* FLAC__real is the basic floating point type used in LPC analysis.
|
|
*/
|
|
#ifndef FLAC__INTEGER_ONLY_LIBRARY
|
|
typedef double FLAC__double;
|
|
typedef float FLAC__float;
|
|
/*
|
|
* WATCHOUT: changing FLAC__real will change the signatures of many
|
|
* functions that have assembly language equivalents and break them.
|
|
*/
|
|
typedef float FLAC__real;
|
|
#else
|
|
/*
|
|
* The convention for FLAC__fixedpoint is to use the upper 16 bits
|
|
* for the integer part and lower 16 bits for the fractional part.
|
|
*/
|
|
typedef FLAC__int32 FLAC__fixedpoint;
|
|
extern const FLAC__fixedpoint FLAC__FP_ZERO;
|
|
extern const FLAC__fixedpoint FLAC__FP_ONE_HALF;
|
|
extern const FLAC__fixedpoint FLAC__FP_ONE;
|
|
extern const FLAC__fixedpoint FLAC__FP_LN2;
|
|
extern const FLAC__fixedpoint FLAC__FP_E;
|
|
|
|
#define FLAC__fixedpoint_trunc(x) ((x)>>16)
|
|
|
|
#define FLAC__fixedpoint_mul(x, y) ( (FLAC__fixedpoint) ( ((FLAC__int64)(x)*(FLAC__int64)(y)) >> 16 ) )
|
|
|
|
#define FLAC__fixedpoint_div(x, y) ( (FLAC__fixedpoint) ( ( ((FLAC__int64)(x)<<32) / (FLAC__int64)(y) ) >> 16 ) )
|
|
|
|
/*
|
|
* FLAC__fixedpoint_log2()
|
|
* --------------------------------------------------------------------
|
|
* Returns the base-2 logarithm of the fixed-point number 'x' using an
|
|
* algorithm by Knuth for x >= 1.0
|
|
*
|
|
* 'fracbits' is the number of fractional bits of 'x'. 'fracbits' must
|
|
* be < 32 and evenly divisible by 4 (0 is OK but not very precise).
|
|
*
|
|
* 'precision' roughly limits the number of iterations that are done;
|
|
* use (unsigned)(-1) for maximum precision.
|
|
*
|
|
* If 'x' is less than one -- that is, x < (1<<fracbits) -- then this
|
|
* function will punt and return 0.
|
|
*
|
|
* The return value will also have 'fracbits' fractional bits.
|
|
*/
|
|
FLAC__uint32 FLAC__fixedpoint_log2(FLAC__uint32 x, unsigned fracbits, unsigned precision);
|
|
|
|
#endif
|
|
|
|
#endif
|