mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-27 09:52:17 +00:00
43 lines
1.3 KiB
C
43 lines
1.3 KiB
C
/*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "libavutil/common.h"
|
|
|
|
|
|
// clip a signed integer into the (-2^23), (2^23-1) range
|
|
static inline int dca_clip23(int a)
|
|
{
|
|
return av_clip_intp2(a, 23);
|
|
}
|
|
|
|
static inline int32_t dca_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 int64_t dca_round(int64_t a, int bits)
|
|
{
|
|
if (bits > 0)
|
|
return (a + (INT64_C(1) << (bits - 1))) & ~((INT64_C(1) << bits) - 1);
|
|
else
|
|
return a;
|
|
}
|