173 lines
4.5 KiB
C++
173 lines
4.5 KiB
C++
/*
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* Copyright 2003-2019 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_TRAITS_HXX
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#define MPD_PCM_TRAITS_HXX
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#include "SampleFormat.hxx"
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#include <stdint.h>
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#include <stddef.h>
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/**
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* This template describes the specified #SampleFormat. This is an
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* empty prototype; the specializations contain the real definitions.
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* See SampleTraits<uint8_t> for more documentation.
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*/
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template<SampleFormat F>
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struct SampleTraits {};
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template<>
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struct SampleTraits<SampleFormat::S8> {
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/**
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* The type used for one sample value.
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*/
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typedef int8_t value_type;
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/**
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* A writable pointer.
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*/
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typedef value_type *pointer;
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/**
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* A read-only pointer.
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*/
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typedef const value_type *const_pointer;
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/**
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* A "long" type that is large and accurate enough for adding
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* two values without risking an (integer) overflow or
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* (floating point) precision loss.
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*/
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typedef int sum_type;
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/**
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* A "long" type that is large and accurate enough for
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* arithmetic without risking an (integer) overflow or
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* (floating point) precision loss.
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*/
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typedef int_least32_t long_type;
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/**
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* The size of one sample in bytes.
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*/
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static constexpr size_t SAMPLE_SIZE = sizeof(value_type);
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/**
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* The integer bit depth of one sample. This attribute may
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* not exist if this is not an integer sample format.
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*/
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static constexpr unsigned BITS = sizeof(value_type) * 8;
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/**
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* The minimum sample value.
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*/
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static constexpr value_type MIN = -(sum_type(1) << (BITS - 1));
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/**
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* The maximum sample value.
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*/
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static constexpr value_type MAX = (sum_type(1) << (BITS - 1)) - 1;
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/**
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* A value which represents "silence".
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*/
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static constexpr value_type SILENCE = 0;
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};
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template<>
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struct SampleTraits<SampleFormat::S16> {
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typedef int16_t value_type;
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typedef value_type *pointer;
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typedef const value_type *const_pointer;
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typedef int_least32_t sum_type;
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typedef int_least32_t long_type;
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static constexpr size_t SAMPLE_SIZE = sizeof(value_type);
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static constexpr unsigned BITS = sizeof(value_type) * 8;
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static constexpr value_type MIN = -(sum_type(1) << (BITS - 1));
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static constexpr value_type MAX = (sum_type(1) << (BITS - 1)) - 1;
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static constexpr value_type SILENCE = 0;
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};
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template<>
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struct SampleTraits<SampleFormat::S32> {
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typedef int32_t value_type;
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typedef value_type *pointer;
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typedef const value_type *const_pointer;
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typedef int_least64_t sum_type;
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typedef int_least64_t long_type;
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static constexpr size_t SAMPLE_SIZE = sizeof(value_type);
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static constexpr unsigned BITS = sizeof(value_type) * 8;
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static constexpr value_type MIN = -(sum_type(1) << (BITS - 1));
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static constexpr value_type MAX = (sum_type(1) << (BITS - 1)) - 1;
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static constexpr value_type SILENCE = 0;
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};
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template<>
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struct SampleTraits<SampleFormat::S24_P32> {
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typedef int32_t value_type;
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typedef value_type *pointer;
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typedef const value_type *const_pointer;
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typedef int_least32_t sum_type;
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typedef int_least64_t long_type;
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static constexpr size_t SAMPLE_SIZE = sizeof(value_type);
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static constexpr unsigned BITS = 24;
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static constexpr value_type MIN = -(sum_type(1) << (BITS - 1));
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static constexpr value_type MAX = (sum_type(1) << (BITS - 1)) - 1;
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static constexpr value_type SILENCE = 0;
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};
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template<>
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struct SampleTraits<SampleFormat::FLOAT> {
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typedef float value_type;
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typedef value_type *pointer;
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typedef const value_type *const_pointer;
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typedef float sum_type;
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typedef float long_type;
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static constexpr size_t SAMPLE_SIZE = sizeof(value_type);
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static constexpr value_type MIN = -1;
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static constexpr value_type MAX = 1;
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static constexpr value_type SILENCE = 0;
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};
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template<>
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struct SampleTraits<SampleFormat::DSD> {
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typedef uint8_t value_type;
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typedef value_type *pointer;
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typedef const value_type *const_pointer;
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static constexpr size_t SAMPLE_SIZE = sizeof(value_type);
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static constexpr value_type SILENCE = 0x69;
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};
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#endif
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