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#pragma once
namespace SaneAudioRenderer
{
enum class DspFormat
{
Unknown,
Pcm8,
Pcm16,
Pcm24,
Pcm24in32,
Pcm32,
Float,
Double,
};
template <DspFormat OutputFormat>
struct DspFormatTraits;
template <>
struct DspFormatTraits<DspFormat::Pcm8>
{
typedef int8_t SampleType;
};
template <>
struct DspFormatTraits<DspFormat::Pcm16>
{
typedef int16_t SampleType;
};
#pragma pack(push, 1)
typedef struct { int8_t d[3]; } int24_t;
#pragma pack(pop)
static_assert(sizeof(int24_t) == 3, "Failed to pack the struct properly");
template <>
struct DspFormatTraits<DspFormat::Pcm24>
{
typedef int24_t SampleType;
};
template <>
struct DspFormatTraits<DspFormat::Pcm24in32>
{
typedef int32_t SampleType;
};
template <>
struct DspFormatTraits<DspFormat::Pcm32>
{
typedef int32_t SampleType;
};
template <>
struct DspFormatTraits<DspFormat::Float>
{
typedef float SampleType;
};
template <>
struct DspFormatTraits<DspFormat::Double>
{
typedef double SampleType;
};
static_assert(sizeof(float) == 4, "Floats are not IEEE compliant");
static_assert(sizeof(double) == 8, "Floats are not IEEE compliant");
inline uint32_t DspFormatSize(DspFormat format)
{
return (format == DspFormat::Unknown) ? 0 :
(format == DspFormat::Pcm8) ? 1 :
(format == DspFormat::Pcm16) ? 2 :
(format == DspFormat::Pcm24) ? 3 :
(format == DspFormat::Double) ? 8 : 4;
}
inline DspFormat DspFormatFromWaveFormat(const WAVEFORMATEX& format)
{
if (format.nSamplesPerSec == 0)
return DspFormat::Unknown;
if (format.wFormatTag == WAVE_FORMAT_IEEE_FLOAT)
{
switch (format.wBitsPerSample)
{
case 32: return DspFormat::Float;
case 64: return DspFormat::Double;
}
}
else if (format.wFormatTag == WAVE_FORMAT_PCM)
{
switch (format.wBitsPerSample)
{
case 8: return DspFormat::Pcm8;
case 16: return DspFormat::Pcm16;
case 24: return DspFormat::Pcm24;
case 32: return DspFormat::Pcm32;
}
}
else if (format.wFormatTag == WAVE_FORMAT_EXTENSIBLE)
{
const WAVEFORMATEXTENSIBLE& formatExtensible = (const WAVEFORMATEXTENSIBLE&)format;
if (formatExtensible.SubFormat == KSDATAFORMAT_SUBTYPE_IEEE_FLOAT)
{
switch (format.wBitsPerSample)
{
case 32: return DspFormat::Float;
case 64: return DspFormat::Double;
}
}
else if (formatExtensible.SubFormat == KSDATAFORMAT_SUBTYPE_PCM)
{
switch (format.wBitsPerSample)
{
case 8: return DspFormat::Pcm8;
case 16: return DspFormat::Pcm16;
case 24: return DspFormat::Pcm24;
case 32: return formatExtensible.Samples.wValidBitsPerSample == 24 ? DspFormat::Pcm24in32 :
DspFormat::Pcm32;
}
}
}
return DspFormat::Unknown;
}
}
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