aac5773f
 hucm
功能基本完成，接口待打磨
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/*
* Copyright (C) 2016 foo86
*
* 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 AVCODEC_DCAMATH_H
#define AVCODEC_DCAMATH_H
#include "libavutil/common.h"
#include "libavutil/intmath.h"
static inline int32_t norm__(int64_t a, int bits)
{
if (bits > 0)
return (int32_t)((a + (INT64_C(1) << (bits - 1))) >> bits);
else
return (int32_t)a;
}
static inline int32_t mul__(int32_t a, int32_t b, int bits)
{
return norm__((int64_t)a * b, bits);
}
static inline int32_t norm13(int64_t a) { return norm__(a, 13); }
static inline int32_t norm16(int64_t a) { return norm__(a, 16); }
static inline int32_t norm20(int64_t a) { return norm__(a, 20); }
static inline int32_t norm21(int64_t a) { return norm__(a, 21); }
static inline int32_t norm23(int64_t a) { return norm__(a, 23); }
static inline int32_t mul15(int32_t a, int32_t b) { return mul__(a, b, 15); }
static inline int32_t mul16(int32_t a, int32_t b) { return mul__(a, b, 16); }
static inline int32_t mul17(int32_t a, int32_t b) { return mul__(a, b, 17); }
static inline int32_t mul22(int32_t a, int32_t b) { return mul__(a, b, 22); }
static inline int32_t mul23(int32_t a, int32_t b) { return mul__(a, b, 23); }
static inline int32_t mul31(int32_t a, int32_t b) { return mul__(a, b, 31); }
static inline int32_t mul32(int32_t a, int32_t b) { return mul__(a, b, 32); }
static inline int32_t clip23(int32_t a) { return av_clip_intp2(a, 23); }
#endif
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