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/* SPDX-License-Identifier: BSD-3-Clause */
/* SPDX-FileCopyrightText: OpenMPT Project Developers and Contributors */
#pragma once
#include "openmpt/all/BuildSettings.hpp"
#include "mpt/base/floatingpoint.hpp"
#include "mpt/base/macros.hpp"
#include "mpt/base/memory.hpp"
#include "openmpt/base/Endian.hpp"
#include "openmpt/base/Types.hpp"
#include <algorithm>
#include <cmath>
#include <cstddef>
OPENMPT_NAMESPACE_BEGIN
// Byte offsets, from lowest significant to highest significant byte (for various functor template parameters)
#define littleEndian64 0, 1, 2, 3, 4, 5, 6, 7
#define littleEndian32 0, 1, 2, 3
#define littleEndian24 0, 1, 2
#define littleEndian16 0, 1
#define bigEndian64 7, 6, 5, 4, 3, 2, 1, 0
#define bigEndian32 3, 2, 1, 0
#define bigEndian24 2, 1, 0
#define bigEndian16 1, 0
namespace SC
{ // SC = _S_ample_C_onversion
// Every sample decoding functor has to typedef its input_t and output_t
// and has to provide a static constexpr input_inc member
// which describes by how many input_t elements inBuf has to be incremented between invocations.
// input_inc is normally 1 except when decoding e.g. bigger sample values
// from multiple std::byte values.
struct DecodeInt8
{
using input_t = std::byte;
using output_t = int8;
static constexpr std::size_t input_inc = 1;
MPT_FORCEINLINE output_t operator()(const input_t *inBuf)
{
return mpt::byte_cast<int8>(*inBuf);
}
};
struct DecodeUint8
{
using input_t = std::byte;
using output_t = int8;
static constexpr std::size_t input_inc = 1;
MPT_FORCEINLINE output_t operator()(const input_t *inBuf)
{
return static_cast<int8>(static_cast<int>(mpt::byte_cast<uint8>(*inBuf)) - 128);
}
};
struct DecodeInt8Delta
{
using input_t = std::byte;
using output_t = int8;
static constexpr std::size_t input_inc = 1;
uint8 delta;
DecodeInt8Delta()
: delta(0)
{
}
MPT_FORCEINLINE output_t operator()(const input_t *inBuf)
{
delta += mpt::byte_cast<uint8>(*inBuf);
return static_cast<int8>(delta);
}
};
struct DecodeInt16uLaw
{
using input_t = std::byte;
using output_t = int16;
static constexpr std::size_t input_inc = 1;
// clang-format off
static constexpr std::array<int16, 256> uLawTable =
{
-32124,-31100,-30076,-29052,-28028,-27004,-25980,-24956,
-23932,-22908,-21884,-20860,-19836,-18812,-17788,-16764,
-15996,-15484,-14972,-14460,-13948,-13436,-12924,-12412,
-11900,-11388,-10876,-10364, -9852, -9340, -8828, -8316,
-7932, -7676, -7420, -7164, -6908, -6652, -6396, -6140,
-5884, -5628, -5372, -5116, -4860, -4604, -4348, -4092,
-3900, -3772, -3644, -3516, -3388, -3260, -3132, -3004,
-2876, -2748, -2620, -2492, -2364, -2236, -2108, -1980,
-1884, -1820, -1756, -1692, -1628, -1564, -1500, -1436,
-1372, -1308, -1244, -1180, -1116, -1052, -988, -924,
-876, -844, -812, -780, -748, -716, -684, -652,
-620, -588, -556, -524, -492, -460, -428, -396,
-372, -356, -340, -324, -308, -292, -276, -260,
-244, -228, -212, -196, -180, -164, -148, -132,
-120, -112, -104, -96, -88, -80, -72, -64,
-56, -48, -40, -32, -24, -16, -8, -1,
32124, 31100, 30076, 29052, 28028, 27004, 25980, 24956,
23932, 22908, 21884, 20860, 19836, 18812, 17788, 16764,
15996, 15484, 14972, 14460, 13948, 13436, 12924, 12412,
11900, 11388, 10876, 10364, 9852, 9340, 8828, 8316,
7932, 7676, 7420, 7164, 6908, 6652, 6396, 6140,
5884, 5628, 5372, 5116, 4860, 4604, 4348, 4092,
3900, 3772, 3644, 3516, 3388, 3260, 3132, 3004,
2876, 2748, 2620, 2492, 2364, 2236, 2108, 1980,
1884, 1820, 1756, 1692, 1628, 1564, 1500, 1436,
1372, 1308, 1244, 1180, 1116, 1052, 988, 924,
876, 844, 812, 780, 748, 716, 684, 652,
620, 588, 556, 524, 492, 460, 428, 396,
372, 356, 340, 324, 308, 292, 276, 260,
244, 228, 212, 196, 180, 164, 148, 132,
120, 112, 104, 96, 88, 80, 72, 64,
56, 48, 40, 32, 24, 16, 8, 0
};
// clang-format on
MPT_FORCEINLINE output_t operator()(const input_t *inBuf)
{
return uLawTable[mpt::byte_cast<uint8>(*inBuf)];
}
};
struct DecodeInt16ALaw
{
using input_t = std::byte;
using output_t = int16;
static constexpr std::size_t input_inc = 1;
// clang-format off
static constexpr std::array<int16, 256> ALawTable =
{
-5504, -5248, -6016, -5760, -4480, -4224, -4992, -4736,
-7552, -7296, -8064, -7808, -6528, -6272, -7040, -6784,
-2752, -2624, -3008, -2880, -2240, -2112, -2496, -2368,
-3776, -3648, -4032, -3904, -3264, -3136, -3520, -3392,
-22016,-20992,-24064,-23040,-17920,-16896,-19968,-18944,
-30208,-29184,-32256,-31232,-26112,-25088,-28160,-27136,
-11008,-10496,-12032,-11520, -8960, -8448, -9984, -9472,
-15104,-14592,-16128,-15616,-13056,-12544,-14080,-13568,
-344, -328, -376, -360, -280, -264, -312, -296,
-472, -456, -504, -488, -408, -392, -440, -424,
-88, -72, -120, -104, -24, -8, -56, -40,
-216, -200, -248, -232, -152, -136, -184, -168,
-1376, -1312, -1504, -1440, -1120, -1056, -1248, -1184,
-1888, -1824, -2016, -1952, -1632, -1568, -1760, -1696,
-688, -656, -752, -720, -560, -528, -624, -592,
-944, -912, -1008, -976, -816, -784, -880, -848,
5504, 5248, 6016, 5760, 4480, 4224, 4992, 4736,
7552, 7296, 8064, 7808, 6528, 6272, 7040, 6784,
2752, 2624, 3008, 2880, 2240, 2112, 2496, 2368,
3776, 3648, 4032, 3904, 3264, 3136, 3520, 3392,
22016, 20992, 24064, 23040, 17920, 16896, 19968, 18944,
30208, 29184, 32256, 31232, 26112, 25088, 28160, 27136,
11008, 10496, 12032, 11520, 8960, 8448, 9984, 9472,
15104, 14592, 16128, 15616, 13056, 12544, 14080, 13568,
344, 328, 376, 360, 280, 264, 312, 296,
472, 456, 504, 488, 408, 392, 440, 424,
88, 72, 120, 104, 24, 8, 56, 40,
216, 200, 248, 232, 152, 136, 184, 168,
1376, 1312, 1504, 1440, 1120, 1056, 1248, 1184,
1888, 1824, 2016, 1952, 1632, 1568, 1760, 1696,
688, 656, 752, 720, 560, 528, 624, 592,
944, 912, 1008, 976, 816, 784, 880, 848
};
// clang-format on
MPT_FORCEINLINE output_t operator()(const input_t *inBuf)
{
return ALawTable[mpt::byte_cast<uint8>(*inBuf)];
}
};
template <uint16 offset, std::size_t loByteIndex, std::size_t hiByteIndex>
struct DecodeInt16
{
using input_t = std::byte;
using output_t = int16;
static constexpr std::size_t input_inc = 2;
MPT_FORCEINLINE output_t operator()(const input_t *inBuf)
{
return (mpt::byte_cast<uint8>(inBuf[loByteIndex]) | (mpt::byte_cast<uint8>(inBuf[hiByteIndex]) << 8)) - offset;
}
};
template <std::size_t loByteIndex, std::size_t hiByteIndex>
struct DecodeInt16Delta
{
using input_t = std::byte;
using output_t = int16;
static constexpr std::size_t input_inc = 2;
uint16 delta;
DecodeInt16Delta()
: delta(0)
{
}
MPT_FORCEINLINE output_t operator()(const input_t *inBuf)
{
delta += mpt::byte_cast<uint8>(inBuf[loByteIndex]) | (mpt::byte_cast<uint8>(inBuf[hiByteIndex]) << 8);
return static_cast<int16>(delta);
}
};
struct DecodeInt16Delta8
{
using input_t = std::byte;
using output_t = int16;
static constexpr std::size_t input_inc = 2;
uint16 delta;
DecodeInt16Delta8()
: delta(0)
{
}
MPT_FORCEINLINE output_t operator()(const input_t *inBuf)
{
delta += mpt::byte_cast<uint8>(inBuf[0]);
int16 result = delta & 0xFF;
delta += mpt::byte_cast<uint8>(inBuf[1]);
result |= (delta << 8);
return result;
}
};
template <uint32 offset, std::size_t loByteIndex, std::size_t midByteIndex, std::size_t hiByteIndex>
struct DecodeInt24
{
using input_t = std::byte;
using output_t = int32;
static constexpr std::size_t input_inc = 3;
MPT_FORCEINLINE output_t operator()(const input_t *inBuf)
{
return ((mpt::byte_cast<uint8>(inBuf[loByteIndex]) << 8) | (mpt::byte_cast<uint8>(inBuf[midByteIndex]) << 16) | (mpt::byte_cast<uint8>(inBuf[hiByteIndex]) << 24)) - offset;
}
};
template <uint32 offset, std::size_t loLoByteIndex, std::size_t loHiByteIndex, std::size_t hiLoByteIndex, std::size_t hiHiByteIndex>
struct DecodeInt32
{
using input_t = std::byte;
using output_t = int32;
static constexpr std::size_t input_inc = 4;
MPT_FORCEINLINE output_t operator()(const input_t *inBuf)
{
return (mpt::byte_cast<uint8>(inBuf[loLoByteIndex]) | (mpt::byte_cast<uint8>(inBuf[loHiByteIndex]) << 8) | (mpt::byte_cast<uint8>(inBuf[hiLoByteIndex]) << 16) | (mpt::byte_cast<uint8>(inBuf[hiHiByteIndex]) << 24)) - offset;
}
};
template <uint64 offset, std::size_t b0, std::size_t b1, std::size_t b2, std::size_t b3, std::size_t b4, std::size_t b5, std::size_t b6, std::size_t b7>
struct DecodeInt64
{
using input_t = std::byte;
using output_t = int64;
static constexpr std::size_t input_inc = 8;
MPT_FORCEINLINE output_t operator()(const input_t *inBuf)
{
return (uint64(0)
| (static_cast<uint64>(mpt::byte_cast<uint8>(inBuf[b0])) << 0)
| (static_cast<uint64>(mpt::byte_cast<uint8>(inBuf[b1])) << 8)
| (static_cast<uint64>(mpt::byte_cast<uint8>(inBuf[b2])) << 16)
| (static_cast<uint64>(mpt::byte_cast<uint8>(inBuf[b3])) << 24)
| (static_cast<uint64>(mpt::byte_cast<uint8>(inBuf[b4])) << 32)
| (static_cast<uint64>(mpt::byte_cast<uint8>(inBuf[b5])) << 40)
| (static_cast<uint64>(mpt::byte_cast<uint8>(inBuf[b6])) << 48)
| (static_cast<uint64>(mpt::byte_cast<uint8>(inBuf[b7])) << 56))
- offset;
}
};
template <std::size_t loLoByteIndex, std::size_t loHiByteIndex, std::size_t hiLoByteIndex, std::size_t hiHiByteIndex>
struct DecodeFloat32
{
using input_t = std::byte;
using output_t = float32;
static constexpr std::size_t input_inc = 4;
MPT_FORCEINLINE output_t operator()(const input_t *inBuf)
{
float32 val = IEEE754binary32LE(inBuf[loLoByteIndex], inBuf[loHiByteIndex], inBuf[hiLoByteIndex], inBuf[hiHiByteIndex]);
val = mpt::sanitize_nan(val);
if(std::isinf(val))
{
if(val >= 0.0f)
{
val = 1.0f;
} else
{
val = -1.0f;
}
}
return val;
}
};
template <std::size_t loLoByteIndex, std::size_t loHiByteIndex, std::size_t hiLoByteIndex, std::size_t hiHiByteIndex>
struct DecodeScaledFloat32
{
using input_t = std::byte;
using output_t = float32;
static constexpr std::size_t input_inc = 4;
float factor;
MPT_FORCEINLINE output_t operator()(const input_t *inBuf)
{
float32 val = IEEE754binary32LE(inBuf[loLoByteIndex], inBuf[loHiByteIndex], inBuf[hiLoByteIndex], inBuf[hiHiByteIndex]);
val = mpt::sanitize_nan(val);
if(std::isinf(val))
{
if(val >= 0.0f)
{
val = 1.0f;
} else
{
val = -1.0f;
}
}
return factor * val;
}
MPT_FORCEINLINE DecodeScaledFloat32(float scaleFactor)
: factor(scaleFactor)
{
return;
}
};
template <std::size_t b0, std::size_t b1, std::size_t b2, std::size_t b3, std::size_t b4, std::size_t b5, std::size_t b6, std::size_t b7>
struct DecodeFloat64
{
using input_t = std::byte;
using output_t = float64;
static constexpr std::size_t input_inc = 8;
MPT_FORCEINLINE output_t operator()(const input_t *inBuf)
{
float64 val = IEEE754binary64LE(inBuf[b0], inBuf[b1], inBuf[b2], inBuf[b3], inBuf[b4], inBuf[b5], inBuf[b6], inBuf[b7]);
val = mpt::sanitize_nan(val);
if(std::isinf(val))
{
if(val >= 0.0)
{
val = 1.0;
} else
{
val = -1.0;
}
}
return val;
}
};
template <typename Tsample>
struct DecodeIdentity
{
using input_t = Tsample;
using output_t = Tsample;
static constexpr std::size_t input_inc = 1;
MPT_FORCEINLINE output_t operator()(const input_t *inBuf)
{
return *inBuf;
}
};
// Reads sample data with Func and passes it directly to Func2.
// Func1::output_t and Func2::input_t must be identical
template <typename Func2, typename Func1>
struct ConversionChain
{
using input_t = typename Func1::input_t;
using output_t = typename Func2::output_t;
static constexpr std::size_t input_inc = Func1::input_inc;
Func1 func1;
Func2 func2;
MPT_FORCEINLINE output_t operator()(const input_t *inBuf)
{
return func2(func1(inBuf));
}
MPT_FORCEINLINE ConversionChain(Func2 f2 = Func2(), Func1 f1 = Func1())
: func1(f1)
, func2(f2)
{
return;
}
};
} // namespace SC
OPENMPT_NAMESPACE_END
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