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/*
* Copyright (C) 2003-2015 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_TRAITS_HXX
#define MPD_PCM_TRAITS_HXX
#include "check.h"
#include "AudioFormat.hxx"
#include <stdint.h>
#include <stddef.h>
/**
* This template describes the specified #SampleFormat. This is an
* empty prototype; the specializations contain the real definitions.
* See SampleTraits<uint8_t> for more documentation.
*/
template<SampleFormat F>
struct SampleTraits {};
template<>
struct SampleTraits<SampleFormat::S8> {
/**
* The type used for one sample value.
*/
typedef int8_t value_type;
/**
* A writable pointer.
*/
typedef value_type *pointer_type;
/**
* A read-only pointer.
*/
typedef const value_type *const_pointer_type;
/**
* A "long" type that is large and accurate enough for adding
* two values without risking an (integer) overflow or
* (floating point) precision loss.
*/
typedef int sum_type;
/**
* A "long" type that is large and accurate enough for
* arithmetic without risking an (integer) overflow or
* (floating point) precision loss.
*/
typedef int_least32_t long_type;
/**
* The size of one sample in bytes.
*/
static constexpr size_t SAMPLE_SIZE = sizeof(value_type);
/**
* The integer bit depth of one sample. This attribute may
* not exist if this is not an integer sample format.
*/
static constexpr unsigned BITS = sizeof(value_type) * 8;
/**
* The minimum sample value.
*/
static constexpr value_type MIN = -(sum_type(1) << (BITS - 1));
/**
* The maximum sample value.
*/
static constexpr value_type MAX = (sum_type(1) << (BITS - 1)) - 1;
};
template<>
struct SampleTraits<SampleFormat::S16> {
typedef int16_t value_type;
typedef value_type *pointer_type;
typedef const value_type *const_pointer_type;
typedef int_least32_t sum_type;
typedef int_least32_t long_type;
static constexpr size_t SAMPLE_SIZE = sizeof(value_type);
static constexpr unsigned BITS = sizeof(value_type) * 8;
static constexpr value_type MIN = -(sum_type(1) << (BITS - 1));
static constexpr value_type MAX = (sum_type(1) << (BITS - 1)) - 1;
};
template<>
struct SampleTraits<SampleFormat::S32> {
typedef int32_t value_type;
typedef value_type *pointer_type;
typedef const value_type *const_pointer_type;
typedef int_least64_t sum_type;
typedef int_least64_t long_type;
static constexpr size_t SAMPLE_SIZE = sizeof(value_type);
static constexpr unsigned BITS = sizeof(value_type) * 8;
static constexpr value_type MIN = -(sum_type(1) << (BITS - 1));
static constexpr value_type MAX = (sum_type(1) << (BITS - 1)) - 1;
};
template<>
struct SampleTraits<SampleFormat::S24_P32> {
typedef int32_t value_type;
typedef value_type *pointer_type;
typedef const value_type *const_pointer_type;
typedef int_least32_t sum_type;
typedef int_least64_t long_type;
static constexpr size_t SAMPLE_SIZE = sizeof(value_type);
static constexpr unsigned BITS = 24;
static constexpr value_type MIN = -(sum_type(1) << (BITS - 1));
static constexpr value_type MAX = (sum_type(1) << (BITS - 1)) - 1;
};
template<>
struct SampleTraits<SampleFormat::FLOAT> {
typedef float value_type;
typedef value_type *pointer_type;
typedef const value_type *const_pointer_type;
typedef float sum_type;
typedef float long_type;
static constexpr size_t SAMPLE_SIZE = sizeof(value_type);
static constexpr value_type MIN = -1;
static constexpr value_type MAX = 1;
};
#endif
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