ProcessFloatSamples.h
/* |
* File: ProcessFloatSamples.h |
* |
* Contains: This file provides the interface to a simple filter that implements a lowpass filter with with a 400 Hz cutoff. |
* Good references for the implementation of filters include: |
* -Discrete-Time Signal Processing, Schafer |
* -Introduction to Signal Processing, Orfanidis |
* -Understanding Digital Signal Processing, Lyons |
* |
* Version: 1.0 |
* |
* Created: 11-23-2004 |
* |
* � Copyright 2004-2013 Apple Computer, Inc. All rights reserved. |
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#include <IOKit/IOTypes.h> |
// _ParamStruct - coefficients for filter |
__BEGIN_DECLS |
typedef struct _ParamStruct |
{ |
float b0; |
float b1; |
float b2; |
float a1; |
float a2; |
} ParamStruct, *ParamStructPtr; |
// _StateStruct - state variables for filter |
typedef struct _StateStruct |
{ |
float xstate1l; |
float xstate2l; |
float ystate1l; |
float ystate2l; |
float xstate1r; |
float xstate2r; |
float ystate1r; |
float ystate2r; |
} StateStruct, *StateStructPtr; |
void processSamples (float * dataBuffer, UInt32 numSampleFrames, UInt32 numChannels, ParamStructPtr inParamStructPtr, StateStructPtr inStateStructPtr); |
void resetProcessingState (StateStructPtr inStateStructPtr); |
void setProcessingParameters (ParamStructPtr inParamStructPtr, UInt32 inSampleRate, UInt32 inNumChannels); |
__END_DECLS |
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