69 lines
1.9 KiB
C++
69 lines
1.9 KiB
C++
/*
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* Copyright (C) 2003-2013 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 "Compiler.h"
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#include <limits>
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#include <stdint.h>
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enum class SampleFormat : uint8_t;
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template<SampleFormat F> struct SampleTraits;
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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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template<typename T>
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static inline const T *
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pcm_end_pointer(const T *p, size_t size)
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{
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return (const T *)((const uint8_t *)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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template<SampleFormat F, class Traits=SampleTraits<F>>
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gcc_const
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static inline typename Traits::value_type
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PcmClamp(typename Traits::long_type x)
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{
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typedef typename Traits::value_type T;
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typedef std::numeric_limits<T> limits;
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static_assert(Traits::MIN >= limits::min(), "out of range");
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static_assert(Traits::MAX <= limits::max(), "out of range");
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if (gcc_unlikely(x < Traits::MIN))
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return T(Traits::MIN);
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if (gcc_unlikely(x > Traits::MAX))
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return T(Traits::MAX);
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return T(x);
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}
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#endif
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