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/*
* 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"
OPENMPT_NAMESPACE_BEGIN
#define MPT_INTMIXER
#ifdef MPT_INTMIXER
typedef int32 mixsample_t;
enum { MIXING_FILTER_PRECISION = 24 }; // Fixed point resonant filter bits
#else
typedef float mixsample_t;
#endif
#define MIXBUFFERSIZE 512
#define NUMMIXINPUTBUFFERS 4
#define VOLUMERAMPPRECISION 12 // Fractional bits in volume ramp variables
enum { MIXING_ATTENUATION = 4 };
enum { MIXING_FRACTIONAL_BITS = 32 - 1 - MIXING_ATTENUATION };
enum
{
MIXING_CLIPMAX = ((1<<MIXING_FRACTIONAL_BITS)-1),
MIXING_CLIPMIN = -(MIXING_CLIPMAX),
};
const float MIXING_SCALEF = static_cast<float>(1 << MIXING_FRACTIONAL_BITS);
// 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