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libavutil/float2half.h
56 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_FLOAT2HALF_H #define AVUTIL_FLOAT2HALF_H #include <stdint.h> #include "intfloat.h" #include "config.h" typedef struct Float2HalfTables { #if HAVE_FAST_FLOAT16 uint8_t dummy; #else uint16_t basetable[512]; uint8_t shifttable[512]; #endif } Float2HalfTables; void ff_init_float2half_tables(Float2HalfTables *t); static inline uint16_t float2half(uint32_t f, const Float2HalfTables *t) { #if HAVE_FAST_FLOAT16 union { _Float16 f; uint16_t i; } u; u.f = av_int2float(f); return u.i; #else uint16_t h; h = t->basetable[(f >> 23) & 0x1ff] + ((f & 0x007fffff) >> t->shifttable[(f >> 23) & 0x1ff]); return h; #endif } #endif /* AVUTIL_FLOAT2HALF_H */