aa760b1735
* commit '2d09b36c0379fcda8f984bc8ad8816c8326fd7bd': doc/platform: Add info on shared builds with MSVC doc/platform: Move a caveat down to the notes section ARM: reinstate optimised intmath.h ffv1: update to ffv1 version 3 Conflicts: doc/platform.texi libavcodec/ffv1.c libavcodec/ffv1.h libavcodec/ffv1dec.c libavcodec/ffv1enc.c Merged-by: Michael Niedermayer <michaelni@gmx.at>
96 lines
2.0 KiB
C
96 lines
2.0 KiB
C
/*
|
|
* Copyright (c) 2010 Mans Rullgard <mans@mansr.com>
|
|
*
|
|
* 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 AVUTIL_INTMATH_H
|
|
#define AVUTIL_INTMATH_H
|
|
|
|
#include <stdint.h>
|
|
|
|
#include "config.h"
|
|
#include "attributes.h"
|
|
|
|
#if ARCH_ARM
|
|
# include "arm/intmath.h"
|
|
#endif
|
|
|
|
/**
|
|
* @addtogroup lavu_internal
|
|
* @{
|
|
*/
|
|
|
|
#if ARCH_ARM
|
|
# include "arm/intmath.h"
|
|
#endif
|
|
|
|
#if HAVE_FAST_CLZ && AV_GCC_VERSION_AT_LEAST(3,4)
|
|
|
|
#ifndef ff_log2
|
|
# define ff_log2(x) (31 - __builtin_clz((x)|1))
|
|
# ifndef ff_log2_16bit
|
|
# define ff_log2_16bit av_log2
|
|
# endif
|
|
#endif /* ff_log2 */
|
|
|
|
#endif /* AV_GCC_VERSION_AT_LEAST(3,4) */
|
|
|
|
extern const uint8_t ff_log2_tab[256];
|
|
|
|
#ifndef ff_log2
|
|
#define ff_log2 ff_log2_c
|
|
static av_always_inline av_const int ff_log2_c(unsigned int v)
|
|
{
|
|
int n = 0;
|
|
if (v & 0xffff0000) {
|
|
v >>= 16;
|
|
n += 16;
|
|
}
|
|
if (v & 0xff00) {
|
|
v >>= 8;
|
|
n += 8;
|
|
}
|
|
n += ff_log2_tab[v];
|
|
|
|
return n;
|
|
}
|
|
#endif
|
|
|
|
#ifndef ff_log2_16bit
|
|
#define ff_log2_16bit ff_log2_16bit_c
|
|
static av_always_inline av_const int ff_log2_16bit_c(unsigned int v)
|
|
{
|
|
int n = 0;
|
|
if (v & 0xff00) {
|
|
v >>= 8;
|
|
n += 8;
|
|
}
|
|
n += ff_log2_tab[v];
|
|
|
|
return n;
|
|
}
|
|
#endif
|
|
|
|
#define av_log2 ff_log2
|
|
#define av_log2_16bit ff_log2_16bit
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
#endif /* AVUTIL_INTMATH_H */
|