154 lines
4.1 KiB
C++
154 lines
4.1 KiB
C++
/*
|
|
* Copyright (C) 2003-2014 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
|