AppleDBDMAFloatLib.h   [plain text]


/*
 *  AppleDBDMAAudioFloatLib.h
 *  AppleOnboardAudio
 *
 * 	Public interface for floating point library.
 *  The library includes input and output conversion 
 *  routines with different bit depths and processing
 *  requirements.  It also contains utilities that 
 *  require floating point.
 *	
 *  Created on Thu Nov 14 2002.
 *  Copyright (c) 2002 Apple Computer. All rights reserved.
 *
 */
#ifndef FLOAT_LIB_H
#define FLOAT_LIB_H

#include "AppleDBDMAClipLib.h"

extern "C" {

#pragma mark ----------------------------- 
#pragma mark ••• Processing Functions
#pragma mark ----------------------------- 

void mixAndMuteRightChannel(float* inFloatBufferPtr, float* outFloatBufferPtr, UInt32 numSamples); 
void volume (float* inFloatBufferPtr, UInt32 numSamples, float* inLeftVolume, float* inRightVolume, float* inPreviousLeftVolume, float* inPreviousRightVolume);


#pragma mark ----------------------------- 
#pragma mark ••• iSub Processing Functions
#pragma mark ----------------------------- 

void iSubDownSampleLinearAndConvert(float* inData, float* srcPhase, float* srcState, UInt32 adaptiveSampleRate, UInt32 outputSampleRate, UInt32 sampleIndex, UInt32 maxSampleIndex, SInt16 *iSubBufferMemory, SInt32 *iSubBufferOffset, UInt32 iSubBufferLen, UInt32 *loopCount);
Boolean Set4thOrderCoefficients (iSubCoefficients* coefficients, UInt32 samplingRate);
void StereoCrossover4thOrderPhaseComp (float *in, float *low, float *high, UInt32 frames, UInt32 samplingRate, iSubCoefficients* coefficients, PreviousValues *section1State, PreviousValues *section2State, PreviousValues *phaseCompState);
void StereoLowPass4thOrder (float *in, float *low, UInt32 frames, UInt32 samplingRate, iSubCoefficients* coefficients, PreviousValues *section1State, PreviousValues *section2State);

#pragma mark ----------------------------- 
#pragma mark ••• Integer to Float
#pragma mark ----------------------------- 

void Int8ToFloat32( SInt8 *src, float *dest, unsigned int count );

void NativeInt16ToFloat32( signed short *src, float *dest, unsigned int count, int bitDepth );
void NativeInt24ToFloat32( long *src, float *dest, unsigned int count, int bitDepth );
void NativeInt32ToFloat32( long *src, float *dest, unsigned int count, int bitDepth );

void NativeInt16ToFloat32Gain( signed short *src, float *dest, unsigned int count, int bitDepth, float* inGainLPtr, float* inGainRPtr );
void NativeInt16ToFloat32CopyRightToLeft( signed short *src, float *dest, unsigned int count, int bitDepth );

void NativeInt32ToFloat32Gain( signed long *src, float *dest, unsigned int count, int bitDepth, float* inGainLPtr, float* inGainRPtr );

void SwapInt16ToFloat32( signed short *src, float *dest, unsigned int count, int bitDepth );
void SwapInt24ToFloat32( long *src, float *dest, unsigned int count, int bitDepth );
void SwapInt32ToFloat32( long *src, float *dest, unsigned int count, int bitDepth );

#pragma mark ----------------------------- 
#pragma mark ••• Float to Integer
#pragma mark ----------------------------- 

void Float32ToInt8( float *src, SInt8 *dst, unsigned int count );
void Float32ToNativeInt16( float *src, signed short *dst, unsigned int count );
void Float32ToNativeInt24( float *src, signed long *dst, unsigned int count );
void Float32ToNativeInt32( float *src, signed long *dst, unsigned int count );
void Float32ToSwapInt16( float *src, signed short *dst, unsigned int count );
void Float32ToSwapInt24( float *src, signed long *dst, unsigned int count );
void Float32ToSwapInt32( float *src, signed long *dst, unsigned int count );

#pragma mark ---------------------------------------- 
#pragma mark ••• Utilities
#pragma mark ---------------------------------------- 

int 	validateSoftwareVolumes( float left, float right,UInt32 maxVolumedB, UInt32 minVolumedB);
void 	inputGainConverter (UInt32 inGainIndex, float* ioGainPtr);
void 	volumeConverter (UInt32 inVolume, UInt32 inMinLinear, UInt32 inMaxLinear, SInt32 inMindB, SInt32 inMaxdB, float* outVolume);
void 	convertToFourDotTwenty(FourDotTwenty* ioFourDotTwenty, float* inFloatPtr);

void	convertNanosToPercent (UInt64 inNumerator, UInt64 inDenominator, float * percent);

};

#endif