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https://github.com/FFmpeg/FFmpeg.git
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dcbff35199
* commit 'd15c21e5fa3961f10026da1a3080a3aa3cf4cec9': avutil: Add a copy of ff_sqrt_tab back into avutil to restore ABI compatibility avutil: make some tables visible again avutil: remove inline av_log2 from public API celp_math: rename ff_log2 to ff_log2_q15 Conflicts: libavutil/libavutil.v Merged-by: Michael Niedermayer <michaelni@gmx.at>
92 lines
1.9 KiB
C
92 lines
1.9 KiB
C
/*
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* Copyright (c) 2010 Mans Rullgard <mans@mansr.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVUTIL_INTMATH_H
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#define AVUTIL_INTMATH_H
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#include <stdint.h>
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#include "config.h"
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#include "attributes.h"
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/**
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* @addtogroup lavu_internal
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* @{
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*/
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#if ARCH_ARM
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# include "arm/intmath.h"
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#endif
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#if HAVE_FAST_CLZ && AV_GCC_VERSION_AT_LEAST(3,4)
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#ifndef ff_log2
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# define ff_log2(x) (31 - __builtin_clz((x)|1))
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# ifndef ff_log2_16bit
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# define ff_log2_16bit av_log2
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# endif
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#endif /* ff_log2 */
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#endif /* AV_GCC_VERSION_AT_LEAST(3,4) */
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extern const uint8_t ff_log2_tab[256];
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#ifndef ff_log2
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#define ff_log2 ff_log2_c
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static av_always_inline av_const int ff_log2_c(unsigned int v)
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{
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int n = 0;
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if (v & 0xffff0000) {
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v >>= 16;
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n += 16;
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}
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if (v & 0xff00) {
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v >>= 8;
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n += 8;
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}
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n += ff_log2_tab[v];
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return n;
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}
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#endif
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#ifndef ff_log2_16bit
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#define ff_log2_16bit ff_log2_16bit_c
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static av_always_inline av_const int ff_log2_16bit_c(unsigned int v)
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{
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int n = 0;
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if (v & 0xff00) {
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v >>= 8;
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n += 8;
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}
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n += ff_log2_tab[v];
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return n;
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}
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#endif
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#define av_log2 ff_log2
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#define av_log2_16bit ff_log2_16bit
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/**
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* @}
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*/
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#endif /* AVUTIL_INTMATH_H */
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