vf_*_vaapi: Support increasing hardware frame pool size
[libav.git] / libavcodec / dcamath.h
1 /*
2 * This file is part of Libav.
3 *
4 * Libav is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * Libav is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with Libav; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #include "libavutil/common.h"
20
21
22 // clip a signed integer into the (-2^23), (2^23-1) range
23 static inline int dca_clip23(int a)
24 {
25 return av_clip_intp2(a, 23);
26 }
27
28 static inline int32_t dca_norm(int64_t a, int bits)
29 {
30 if (bits > 0)
31 return (int32_t)((a + (INT64_C(1) << (bits - 1))) >> bits);
32 else
33 return (int32_t)a;
34 }
35
36 static inline int64_t dca_round(int64_t a, int bits)
37 {
38 if (bits > 0)
39 return (a + (INT64_C(1) << (bits - 1))) & ~((INT64_C(1) << bits) - 1);
40 else
41 return a;
42 }