PeerStreamer

/*

 * copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at>

 *

 * This file is part of FFmpeg.

 *

 * FFmpeg is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * FFmpeg is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with FFmpeg; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

#ifndef FFMPEG_MATHEMATICS_H

#define FFMPEG_MATHEMATICS_H

#include <stdint.h>

#include <math.h>

#include "rational.h"

#ifndef M_E

#define M_E            2.7182818284590452354   /* e */

#endif

#ifndef M_LN2

#define M_LN2          0.69314718055994530942  /* log_e 2 */

#endif

#ifndef M_LN10

#define M_LN10         2.30258509299404568402  /* log_e 10 */

#endif

#ifndef M_SQRT1_2

#define M_SQRT1_2      0.70710678118654752440  /* 1/sqrt(2) */

#endif

enum AVRounding {

    AV_ROUND_ZERO     = 0, ///< round toward zero

    AV_ROUND_INF      = 1, ///< round away from zero

    AV_ROUND_DOWN     = 2, ///< round toward -infinity

    AV_ROUND_UP       = 3, ///< round toward +infinity

    AV_ROUND_NEAR_INF = 5, ///< round to nearest and halfway cases away from zero

};

/**

 * rescale a 64bit integer with rounding to nearest.

 * a simple a*b/c isn't possible as it can overflow

 */

int64_t av_rescale(int64_t a, int64_t b, int64_t c) av_const;

/**

 * rescale a 64bit integer with specified rounding.

 * a simple a*b/c isn't possible as it can overflow

 */

int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding) av_const;

/**

 * rescale a 64bit integer by 2 rational numbers.

 */

int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq) av_const;

#endif /* FFMPEG_MATHEMATICS_H */