android / platform / external / flac / 117ca6bf4fd217f8afacd3b11b57c35adf499158 / . / libFLAC / include / private / float.h

/* libFLAC - Free Lossless Audio Codec library | |

* Copyright (C) 2004-2009 Josh Coalson | |

* Copyright (C) 2011-2016 Xiph.Org Foundation | |

* | |

* 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, | |

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* 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" | |

/* | |

* All the code in libFLAC that uses float and double | |

* should be protected by checks of the macro | |

* FLAC__INTEGER_ONLY_LIBRARY. | |

* | |

*/ | |

#ifndef FLAC__INTEGER_ONLY_LIBRARY | |

/* | |

* FLAC__real is the basic floating point type used in LPC analysis. | |

* | |

* 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 |