diff options
| author | foo86 <foobaz86@gmail.com> | 2016-01-08 00:48:57 +0300 |
|---|---|---|
| committer | Hendrik Leppkes <h.leppkes@gmail.com> | 2016-01-31 19:09:38 +0300 |
| commit | 4a53b83691ac1c1feefe8749756b149c31ad4ccb (patch) | |
| tree | 0ad6ef792bb89fb40f14619dce162e574c8295f6 /libavcodec/dcamath.h | |
| parent | 9a0a3bbeaaf498061c357755443beab16b25c4f5 (diff) | |
avcodec/dca: add math helpers and fixed point DCT
Diffstat (limited to 'libavcodec/dcamath.h')
| -rw-r--r-- | libavcodec/dcamath.h | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/libavcodec/dcamath.h b/libavcodec/dcamath.h new file mode 100644 index 0000000000..e0d6f4fdaa --- /dev/null +++ b/libavcodec/dcamath.h @@ -0,0 +1,55 @@ +/* + * Copyright (C) 2016 foo86 + * + * 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 AVCODEC_DCAMATH_H +#define AVCODEC_DCAMATH_H + +#include "libavutil/common.h" +#include "libavutil/intmath.h" + +static inline int32_t norm__(int64_t a, int bits) +{ + if (bits > 0) + return (int32_t)((a + (INT64_C(1) << (bits - 1))) >> bits); + else + return (int32_t)a; +} + +static inline int32_t mul__(int32_t a, int32_t b, int bits) +{ + return norm__((int64_t)a * b, bits); +} + +static inline int32_t norm13(int64_t a) { return norm__(a, 13); } +static inline int32_t norm16(int64_t a) { return norm__(a, 16); } +static inline int32_t norm20(int64_t a) { return norm__(a, 20); } +static inline int32_t norm21(int64_t a) { return norm__(a, 21); } +static inline int32_t norm23(int64_t a) { return norm__(a, 23); } + +static inline int32_t mul15(int32_t a, int32_t b) { return mul__(a, b, 15); } +static inline int32_t mul16(int32_t a, int32_t b) { return mul__(a, b, 16); } +static inline int32_t mul17(int32_t a, int32_t b) { return mul__(a, b, 17); } +static inline int32_t mul22(int32_t a, int32_t b) { return mul__(a, b, 22); } +static inline int32_t mul23(int32_t a, int32_t b) { return mul__(a, b, 23); } +static inline int32_t mul31(int32_t a, int32_t b) { return mul__(a, b, 31); } + +static inline int32_t clip23(int32_t a) { return av_clip_intp2(a, 23); } + +#endif |