95 lines
2.4 KiB
C
95 lines
2.4 KiB
C
/*
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* Copyright (C) 2003-2011 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef MPD_PCM_UTILS_H
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#define MPD_PCM_UTILS_H
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#include <glib.h>
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#include <stdint.h>
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/**
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* Add a byte count to the specified pointer. This is a utility
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* function to convert a source pointer and a byte count to an "end"
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* pointer for use in loops.
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*/
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static inline const void *
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pcm_end_pointer(const void *p, size_t size)
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{
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return (const char *)p + size;
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}
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/**
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* Check if the value is within the range of the provided bit size,
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* and caps it if necessary.
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*/
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static inline int32_t
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pcm_range(int32_t sample, unsigned bits)
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{
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if (G_UNLIKELY(sample < (-1 << (bits - 1))))
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return -1 << (bits - 1);
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if (G_UNLIKELY(sample >= (1 << (bits - 1))))
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return (1 << (bits - 1)) - 1;
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return sample;
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}
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/**
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* Check if the value is within the range of the provided bit size,
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* and caps it if necessary.
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*/
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static inline int64_t
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pcm_range_64(int64_t sample, unsigned bits)
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{
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if (G_UNLIKELY(sample < ((int64_t)-1 << (bits - 1))))
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return (int64_t)-1 << (bits - 1);
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if (G_UNLIKELY(sample >= ((int64_t)1 << (bits - 1))))
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return ((int64_t)1 << (bits - 1)) - 1;
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return sample;
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}
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G_GNUC_CONST
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static inline int16_t
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pcm_clamp_16(int x)
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{
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static const int32_t MIN_VALUE = G_MININT16;
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static const int32_t MAX_VALUE = G_MAXINT16;
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if (G_UNLIKELY(x < MIN_VALUE))
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return MIN_VALUE;
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if (G_UNLIKELY(x > MAX_VALUE))
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return MAX_VALUE;
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return x;
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}
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G_GNUC_CONST
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static inline int32_t
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pcm_clamp_24(int x)
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{
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static const int32_t MIN_VALUE = -(1 << 23);
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static const int32_t MAX_VALUE = (1 << 23) - 1;
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if (G_UNLIKELY(x < MIN_VALUE))
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return MIN_VALUE;
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if (G_UNLIKELY(x > MAX_VALUE))
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return MAX_VALUE;
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return x;
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}
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#endif
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