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a51c2fcdc1
* commit '85990140e7302d1e7fcc9fc0eea316178c19fe03': dca: Add math helpers. Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>
43 lines
1.3 KiB
C
43 lines
1.3 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/common.h"
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// clip a signed integer into the (-2^23), (2^23-1) range
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static inline int dca_clip23(int a)
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{
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return av_clip_intp2(a, 23);
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}
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static inline int32_t dca_norm(int64_t a, int bits)
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{
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if (bits > 0)
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return (int32_t)((a + (INT64_C(1) << (bits - 1))) >> bits);
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else
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return (int32_t)a;
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}
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static inline int64_t dca_round(int64_t a, int bits)
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{
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if (bits > 0)
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return (a + (INT64_C(1) << (bits - 1))) & ~((INT64_C(1) << bits) - 1);
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else
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return a;
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}
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