60 lines
2.0 KiB
C
60 lines
2.0 KiB
C
|
/*
|
||
|
|
* Mixer.h
|
||
|
|
* -------
|
||
|
|
* Purpose: Basic mixer constants
|
||
|
|
* Notes : (currently none)
|
||
|
|
* Authors: OpenMPT Devs
|
||
|
|
* The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
#pragma once
|
||
|
|
|
||
|
|
#include "BuildSettings.h"
|
||
|
|
|
||
|
|
#include "../soundbase/SampleTypes.h"
|
||
|
|
|
||
|
|
OPENMPT_NAMESPACE_BEGIN
|
||
|
|
|
||
|
|
#define MPT_INTMIXER
|
||
|
|
|
||
|
|
#ifdef MPT_INTMIXER
|
||
|
|
using mixsample_t = MixSampleIntTraits::sample_type;
|
||
|
|
enum { MIXING_FILTER_PRECISION = MixSampleIntTraits::filter_precision_bits() }; // Fixed point resonant filter bits
|
||
|
|
#else
|
||
|
|
using mixsample_t = AudioSampleFloat;
|
||
|
|
#endif
|
||
|
|
enum { MIXING_ATTENUATION = MixSampleIntTraits::mix_headroom_bits() };
|
||
|
|
enum { MIXING_FRACTIONAL_BITS = MixSampleIntTraits::mix_fractional_bits() };
|
||
|
|
|
||
|
|
inline constexpr float MIXING_SCALEF = MixSampleIntTraits::mix_scale<float>();
|
||
|
|
|
||
|
|
#ifdef MPT_INTMIXER
|
||
|
|
static_assert(sizeof(mixsample_t) == 4);
|
||
|
|
static_assert(MIXING_FILTER_PRECISION == 24);
|
||
|
|
static_assert(MIXING_ATTENUATION == 4);
|
||
|
|
static_assert(MIXING_FRACTIONAL_BITS == 27);
|
||
|
|
static_assert(MixSampleIntTraits::mix_clip_max() == int32(0x7FFFFFF));
|
||
|
|
static_assert(MixSampleIntTraits::mix_clip_min() == (0 - int32(0x7FFFFFF)));
|
||
|
|
static_assert(MIXING_SCALEF == 134217728.0f);
|
||
|
|
#else
|
||
|
|
static_assert(sizeof(mixsample_t) == 4);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#define MIXBUFFERSIZE 512
|
||
|
|
#define NUMMIXINPUTBUFFERS 4
|
||
|
|
|
||
|
|
#define VOLUMERAMPPRECISION 12 // Fractional bits in volume ramp variables
|
||
|
|
|
||
|
|
// The absolute maximum number of sampling points any interpolation algorithm is going to look at in any direction from the current sampling point
|
||
|
|
// Currently, the maximum is 4 sampling points forwards and 3 sampling points backwards (Polyphase / FIR algorithms).
|
||
|
|
// Hence, this value must be at least 4.
|
||
|
|
// Note that choosing a higher value (e.g. 16) will reduce CPU usage when using many extremely short (length < 16) samples.
|
||
|
|
#define InterpolationMaxLookahead 16u
|
||
|
|
|
||
|
|
// Maximum size of a sampling point of a sample, in bytes.
|
||
|
|
// The biggest sampling point size is currently 16-bit stereo = 2 * 2 bytes.
|
||
|
|
#define MaxSamplingPointSize 4u
|
||
|
|
|
||
|
|
OPENMPT_NAMESPACE_END
|