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/*
* Copyright (C) 2003-2011 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef MPD_PCM_UTILS_H
#define MPD_PCM_UTILS_H
#include "gcc.h"
#include <stdint.h>
/**
* Add a byte count to the specified pointer. This is a utility
* function to convert a source pointer and a byte count to an "end"
* pointer for use in loops.
*/
static inline const void *
pcm_end_pointer(const void *p, size_t size)
{
return (const char *)p + size;
}
/**
* Check if the value is within the range of the provided bit size,
* and caps it if necessary.
*/
static inline int32_t
pcm_range(int32_t sample, unsigned bits)
{
if (gcc_unlikely(sample < (-1 << (bits - 1))))
return -1 << (bits - 1);
if (gcc_unlikely(sample >= (1 << (bits - 1))))
return (1 << (bits - 1)) - 1;
return sample;
}
/**
* Check if the value is within the range of the provided bit size,
* and caps it if necessary.
*/
static inline int64_t
pcm_range_64(int64_t sample, unsigned bits)
{
if (gcc_unlikely(sample < ((int64_t)-1 << (bits - 1))))
return (int64_t)-1 << (bits - 1);
if (gcc_unlikely(sample >= ((int64_t)1 << (bits - 1))))
return ((int64_t)1 << (bits - 1)) - 1;
return sample;
}
gcc_const
static inline int16_t
pcm_clamp_16(int x)
{
static const int32_t MIN_VALUE = -(1 << 15);
static const int32_t MAX_VALUE = (1 << 15) - 1;
if (gcc_unlikely(x < MIN_VALUE))
return MIN_VALUE;
if (gcc_unlikely(x > MAX_VALUE))
return MAX_VALUE;
return x;
}
gcc_const
static inline int32_t
pcm_clamp_24(int x)
{
static const int32_t MIN_VALUE = -(1 << 23);
static const int32_t MAX_VALUE = (1 << 23) - 1;
if (gcc_unlikely(x < MIN_VALUE))
return MIN_VALUE;
if (gcc_unlikely(x > MAX_VALUE))
return MAX_VALUE;
return x;
}
#endif
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