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84 lines
2.3 KiB
C++
84 lines
2.3 KiB
C++
#ifndef STK_NOISE_H
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#define STK_NOISE_H
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#include "Generator.h"
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#include <stdlib.h>
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namespace stk {
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/***************************************************/
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/*! \class Noise
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\brief STK noise generator.
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Generic random number generation using the
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C rand() function. The quality of the rand()
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function varies from one OS to another.
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by Perry R. Cook and Gary P. Scavone, 1995-2012.
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*/
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/***************************************************/
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class Noise : public Generator
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{
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public:
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//! Default constructor that can also take a specific seed value.
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/*!
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If the seed value is zero (the default value), the random number generator is
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seeded with the system time.
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*/
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Noise( unsigned int seed = 0 );
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//! Seed the random number generator with a specific seed value.
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/*!
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If no seed is provided or the seed value is zero, the random
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number generator is seeded with the current system time.
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*/
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void setSeed( unsigned int seed = 0 );
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//! Return the last computed output value.
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StkFloat lastOut( void ) const { return lastFrame_[0]; };
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//! Compute and return one output sample.
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StkFloat tick( void );
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//! Fill a channel of the StkFrames object with computed outputs.
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/*!
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The \c channel argument must be less than the number of
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channels in the StkFrames argument (the first channel is specified
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by 0). However, range checking is only performed if _STK_DEBUG_
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is defined during compilation, in which case an out-of-range value
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will trigger an StkError exception.
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*/
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StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
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protected:
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};
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inline StkFloat Noise :: tick( void )
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{
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return lastFrame_[0] = (StkFloat) ( 2.0 * rand() / (RAND_MAX + 1.0) - 1.0 );
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}
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inline StkFrames& Noise :: tick( StkFrames& frames, unsigned int channel )
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{
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#if defined(_STK_DEBUG_)
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if ( channel >= frames.channels() ) {
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oStream_ << "Noise::tick(): channel and StkFrames arguments are incompatible!";
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handleError( StkError::FUNCTION_ARGUMENT );
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}
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#endif
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StkFloat *samples = &frames[channel];
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unsigned int hop = frames.channels();
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for ( unsigned int i=0; i<frames.frames(); i++, samples += hop )
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*samples = (StkFloat) ( 2.0 * rand() / (RAND_MAX + 1.0) - 1.0 );
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lastFrame_[0] = *(samples-hop);
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return frames;
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}
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} // stk namespace
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#endif
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