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/*
* Modification History
*
* 2004-August-6 Jason Rohrer
* Created.
*
* 2004-August-9 Jason Rohrer
* Changed to use sine components.
*
* 2004-August-12 Jason Rohrer
* Added support for getting blocks of samples.
*
* 2004-August-19 Jason Rohrer
* Fixed bug in walking through wavetable.
*/
#ifndef SOUND_PARAMETER_SPACE_CONTROL_POINT_INCLUDED
#define SOUND_PARAMETER_SPACE_CONTROL_POINT_INCLUDED
#include "ParameterSpaceControlPoint.h"
#include <stdio.h>
/**
* A control point in a 1-D parameterized sound space.
*
* @author Jason Rohrer.
*/
class SoundParameterSpaceControlPoint : public ParameterSpaceControlPoint {
public:
/**
* Constructs a control point.
*
* Note that the waveform is limited to the amplitude range [-1,1]
* and will clip if the sine components sum to produce amplitudes
* ouside of this range.
*
* Start/end freqency and loudness are used to create a linear
* sweep of these values as the sound plays.
*
* @param inNumWaveComponents the number of wave components.
* @param inWaveComponentFreqencies the frequency of each sine
* component. The frequency is in cycles per waveform (in other
* words, how many times this sine component cycles during
* the length of the waveform).
* This array will be destroyed when this class is destroyed.
* @param inWaveComponentAmplitudes the peak amplitude for
* each sine component.
* Each value must be in the range [0,1].
* This array will be destroyed when this class is destroyed.
* @param inStartFrequency the number of times the waveform should
* play per second at the start of the sound.
* @param inEndFrequency the number of times the waveform should
* play per second at by the end of the sound.
* @param inStartLoudness the loudness of the start of the sound
* in the range [0,1].
* @param inEndLoudness the loudness of the end of the sound
* in the range [0,1].
*/
SoundParameterSpaceControlPoint(
int inNumWaveComponents,
double *inWaveComponentFreqencies,
double *inWaveComponentAmplitudes,
double inStartFrequency,
double inEndFrequency,
double inStartLoudness,
double inEndLoudness );
/**
* Constructs a control point by reading values from a text file
* stream.
*
* @param inFILE the open file to read from.
* Must be closed by caller.
* @param outError pointer to where error flag should be returned.
* Destination will be set to true if reading a control point
* from inFILE fails.
*/
SoundParameterSpaceControlPoint( FILE *inFILE, char *outError );
virtual ~SoundParameterSpaceControlPoint();
// implements the ParameterSpaceControlPoint interface
ParameterSpaceControlPoint *copy();
ParameterSpaceControlPoint *createLinearBlend(
ParameterSpaceControlPoint *inOtherPoint,
double inWeightOfOtherPoint );
/**
* Gets a block of samples from this control point.
*
* @param inStartSample the index of the first sample to get.
* @param inSampleCount the number of samples to get.
* @param inSamplesPerSecond the current sample rate.
* @param inSoundLengthInSeconds the total length of the sound being
* played.
*
* @return the samples.
* Must be destroyed by caller.
*/
float *getSoundSamples( unsigned long inStartSample,
unsigned long inSampleCount,
unsigned long inSamplesPerSecond,
double inSoundLengthInSeconds );
// these are public so that other Sound points can access
// them when performing a blend.
int mNumWaveComponents;
double *mWaveComponentFrequencies;
double *mWaveComponentAmplitudes;
double mStartFrequency;
double mEndFrequency;
double mStartLoudness;
double mEndLoudness;
protected:
/**
* Copies an array of doubles, producing a newly constructed array.
*
* @param inArray the array to copy.
* Must be destroyed by caller.
* @param inLength the length of inArray.
*
* @return the copied array.
* Must be destroyed by caller.
*/
double *copyDoubleArray( double *inArray, int inLength );
// used when generating sound samples
double mCurrentWavePoint;
};
#endif
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