FFmpeg
libavutil
float2half.h
Go to the documentation of this file.
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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_FLOAT2HALF_H
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#define AVUTIL_FLOAT2HALF_H
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#include <stdint.h>
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#include "
intfloat.h
"
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#include "config.h"
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typedef
struct
Float2HalfTables
{
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#if HAVE_FAST_FLOAT16
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uint8_t
dummy
;
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#else
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uint16_t
basetable
[512];
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uint8_t
shifttable
[512];
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#endif
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}
Float2HalfTables
;
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void
ff_init_float2half_tables
(
Float2HalfTables
*t);
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static
inline
uint16_t
float2half
(uint32_t
f
,
const
Float2HalfTables
*t)
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{
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#if HAVE_FAST_FLOAT16
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union
{
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_Float16
f
;
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uint16_t
i
;
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}
u
;
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u
.f =
av_int2float
(
f
);
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return
u
.i;
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#else
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uint16_t
h
;
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h
= t->
basetable
[(
f
>> 23) & 0x1ff] + ((
f
& 0x007fffff) >> t->
shifttable
[(
f
>> 23) & 0x1ff]);
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return
h
;
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#endif
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}
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#endif
/* AVUTIL_FLOAT2HALF_H */
Float2HalfTables
Definition:
float2half.h:27
u
#define u(width, name, range_min, range_max)
Definition:
cbs_h2645.c:251
intfloat.h
av_int2float
static av_always_inline float av_int2float(uint32_t i)
Reinterpret a 32-bit integer as a float.
Definition:
intfloat.h:40
dummy
int dummy
Definition:
motion.c:66
Float2HalfTables::shifttable
uint8_t shifttable[512]
Definition:
float2half.h:32
f
f
Definition:
af_crystalizer.c:122
i
#define i(width, name, range_min, range_max)
Definition:
cbs_h2645.c:256
ff_init_float2half_tables
void ff_init_float2half_tables(Float2HalfTables *t)
Definition:
float2half.c:21
float2half
static uint16_t float2half(uint32_t f, const Float2HalfTables *t)
Definition:
float2half.h:38
Float2HalfTables::basetable
uint16_t basetable[512]
Definition:
float2half.h:31
h
h
Definition:
vp9dsp_template.c:2070
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