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master
libavutil/half2float.h
57 строк
1 KB
Timo Rothenpieler
avutil/half2float: use native _Float16 if available
19 авг 2022, 23:09
19 авг 2022, 23:09
ef2c2a2
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/* * 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_HALF2FLOAT_H #define AVUTIL_HALF2FLOAT_H #include <stdint.h> #include "intfloat.h" #include "config.h" typedef struct Half2FloatTables { #if HAVE_FAST_FLOAT16 uint8_t dummy; #else uint32_t mantissatable[3072]; uint32_t exponenttable[64]; uint16_t offsettable[64]; #endif } Half2FloatTables; void ff_init_half2float_tables(Half2FloatTables *t); static inline uint32_t half2float(uint16_t h, const Half2FloatTables *t) { #if HAVE_FAST_FLOAT16 union { _Float16 f; uint16_t i; } u; u.i = h; return av_float2int(u.f); #else uint32_t f; f = t->mantissatable[t->offsettable[h >> 10] + (h & 0x3ff)] + t->exponenttable[h >> 10]; return f; #endif } #endif /* AVUTIL_HALF2FLOAT_H */