SV platform dependency builds

/** @file paex_pink.c

        @ingroup examples_src

        @brief Generate Pink Noise using Gardner method.

        Optimization suggested by James McCartney uses a tree

        to select which random value to replace.

<pre>

        x x x x x x x x x x x x x x x x 

        x   x   x   x   x   x   x   x   

        x       x       x       x       

         x               x               

           x   

</pre>                            

        Tree is generated by counting trailing zeros in an increasing index.

        When the index is zero, no random number is selected.

        @author Phil Burk  http://www.softsynth.com

*/

/*

 * $Id$

 *

 * This program uses the PortAudio Portable Audio Library.

 * For more information see: http://www.portaudio.com

 * Copyright (c) 1999-2000 Ross Bencina and Phil Burk

 *

 * Permission is hereby granted, free of charge, to any person obtaining

 * a copy of this software and associated documentation files

 * (the "Software"), to deal in the Software without restriction,

 * including without limitation the rights to use, copy, modify, merge,

 * publish, distribute, sublicense, and/or sell copies of the Software,

 * and to permit persons to whom the Software is furnished to do so,

 * subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be

 * included in all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.

 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR

 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF

 * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION

 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

 */

/*

 * The text above constitutes the entire PortAudio license; however, 

 * the PortAudio community also makes the following non-binding requests:

 *

 * Any person wishing to distribute modifications to the Software is

 * requested to send the modifications to the original developer so that

 * they can be incorporated into the canonical version. It is also 

 * requested that these non-binding requests be included along with the 

 * license above.

 */

#include <stdio.h>

#include <math.h>

#include "portaudio.h"

#define PINK_MAX_RANDOM_ROWS   (30)

#define PINK_RANDOM_BITS       (24)

#define PINK_RANDOM_SHIFT      ((sizeof(long)*8)-PINK_RANDOM_BITS)

typedef struct

{

    long      pink_Rows[PINK_MAX_RANDOM_ROWS];

    long      pink_RunningSum;   /* Used to optimize summing of generators. */

    int       pink_Index;        /* Incremented each sample. */

    int       pink_IndexMask;    /* Index wrapped by ANDing with this mask. */

    float     pink_Scalar;       /* Used to scale within range of -1.0 to +1.0 */

}

PinkNoise;

/* Prototypes */

static unsigned long GenerateRandomNumber( void );

void InitializePinkNoise( PinkNoise *pink, int numRows );

float GeneratePinkNoise( PinkNoise *pink );

/************************************************************/

/* Calculate pseudo-random 32 bit number based on linear congruential method. */

static unsigned long GenerateRandomNumber( void )

{

    /* Change this seed for different random sequences. */

    static unsigned long randSeed = 22222;

    randSeed = (randSeed * 196314165) + 907633515;

    return randSeed;

}

/************************************************************/

/* Setup PinkNoise structure for N rows of generators. */

void InitializePinkNoise( PinkNoise *pink, int numRows )

{

    int i;

    long pmax;

    pink->pink_Index = 0;

    pink->pink_IndexMask = (1<<numRows) - 1;

    /* Calculate maximum possible signed random value. Extra 1 for white noise always added. */

    pmax = (numRows + 1) * (1<<(PINK_RANDOM_BITS-1));

    pink->pink_Scalar = 1.0f / pmax;

    /* Initialize rows. */

    for( i=0; i<numRows; i++ ) pink->pink_Rows[i] = 0;

    pink->pink_RunningSum = 0;

}

#define PINK_MEASURE

#ifdef PINK_MEASURE

float pinkMax = -999.0;

float pinkMin =  999.0;

#endif

/* Generate Pink noise values between -1.0 and +1.0 */

float GeneratePinkNoise( PinkNoise *pink )

{

    long newRandom;

    long sum;

    float output;

    /* Increment and mask index. */

    pink->pink_Index = (pink->pink_Index + 1) & pink->pink_IndexMask;

    /* If index is zero, don't update any random values. */

    if( pink->pink_Index != 0 )

    {

        /* Determine how many trailing zeros in PinkIndex. */

        /* This algorithm will hang if n==0 so test first. */

        int numZeros = 0;

        int n = pink->pink_Index;

        while( (n & 1) == 0 )

        {

            n = n >> 1;

            numZeros++;

        }

        /* Replace the indexed ROWS random value.

         * Subtract and add back to RunningSum instead of adding all the random

         * values together. Only one changes each time.

         */

        pink->pink_RunningSum -= pink->pink_Rows[numZeros];

        newRandom = ((long)GenerateRandomNumber()) >> PINK_RANDOM_SHIFT;

        pink->pink_RunningSum += newRandom;

        pink->pink_Rows[numZeros] = newRandom;

    }

    /* Add extra white noise value. */

    newRandom = ((long)GenerateRandomNumber()) >> PINK_RANDOM_SHIFT;

    sum = pink->pink_RunningSum + newRandom;

    /* Scale to range of -1.0 to 0.9999. */

    output = pink->pink_Scalar * sum;

#ifdef PINK_MEASURE

    /* Check Min/Max */

    if( output > pinkMax ) pinkMax = output;

    else if( output < pinkMin ) pinkMin = output;

#endif

    return output;

}

/*******************************************************************/

#define PINK_TEST

#ifdef PINK_TEST

/* Context for callback routine. */

typedef struct

{

    PinkNoise   leftPink;

    PinkNoise   rightPink;

    unsigned int sampsToGo;

}

paTestData;

/* This routine will be called by the PortAudio engine when audio is needed.

** It may called at interrupt level on some machines so don't do anything

** that could mess up the system like calling malloc() or free().

*/

static int patestCallback(const void*                     inputBuffer,

                          void*                           outputBuffer,

                          unsigned long                   framesPerBuffer,

                                      const PaStreamCallbackTimeInfo* timeInfo,

                                      PaStreamCallbackFlags           statusFlags,

                          void*                           userData)

{

    int finished;

    int i;

    int numFrames;

    paTestData *data = (paTestData*)userData;

    float *out = (float*)outputBuffer;

    (void) inputBuffer; /* Prevent "unused variable" warnings. */

    /* Are we almost at end. */

    if( data->sampsToGo < framesPerBuffer )

    {

        numFrames = data->sampsToGo;

        finished = 1;

    }

    else

    {

        numFrames = framesPerBuffer;

        finished = 0;

    }

    for( i=0; i<numFrames; i++ )

    {

        *out++ = GeneratePinkNoise( &data->leftPink );

        *out++ = GeneratePinkNoise( &data->rightPink );

    }

    data->sampsToGo -= numFrames;

    return finished;

}

/*******************************************************************/

int main(void);

int main(void)

{

    PaStream*           stream;

    PaError             err;

    paTestData          data;

    PaStreamParameters  outputParameters;

    int                 totalSamps;

    static const double SR  = 44100.0;

    static const int    FPB = 2048; /* Frames per buffer: 46 ms buffers. */

    /* Initialize two pink noise signals with different numbers of rows. */

    InitializePinkNoise( &data.leftPink,  12 );

    InitializePinkNoise( &data.rightPink, 16 );

    /* Look at a few values. */

    {

        int i;

        float pink;

        for( i=0; i<20; i++ )

        {

            pink = GeneratePinkNoise( &data.leftPink );

            printf("Pink = %f\n", pink );

        }

    }

    data.sampsToGo = totalSamps = (int)(60.0 * SR);   /* Play a whole minute. */

    err = Pa_Initialize();

    if( err != paNoError ) goto error;

    /* Open a stereo PortAudio stream so we can hear the result. */

    outputParameters.device = Pa_GetDefaultOutputDevice(); /* Take the default output device. */

    if (outputParameters.device == paNoDevice) {

      fprintf(stderr,"Error: No default output device.\n");

      goto error;

    }

    outputParameters.channelCount = 2;                     /* Stereo output, most likely supported. */

    outputParameters.hostApiSpecificStreamInfo = NULL;

    outputParameters.sampleFormat = paFloat32;             /* 32 bit floating point output. */

    outputParameters.suggestedLatency =

                     Pa_GetDeviceInfo(outputParameters.device)->defaultLowOutputLatency;

    err = Pa_OpenStream(&stream,

                        NULL,                              /* No input. */

                        &outputParameters,

                        SR,                                /* Sample rate. */

                        FPB,                               /* Frames per buffer. */

                        paClipOff, /* we won't output out of range samples so don't bother clipping them */

                        patestCallback,

                        &data);

    if( err != paNoError ) goto error;

    err = Pa_StartStream( stream );

    if( err != paNoError ) goto error;

    printf("Stereo pink noise for one minute...\n");

    while( ( err = Pa_IsStreamActive( stream ) ) == 1 ) Pa_Sleep(100);

    if( err < 0 ) goto error;

    err = Pa_CloseStream( stream );

    if( err != paNoError ) goto error;

#ifdef PINK_MEASURE

    printf("Pink min = %f, max = %f\n", pinkMin, pinkMax );

#endif

    Pa_Terminate();

    return 0;

error:

    Pa_Terminate();

    fprintf( stderr, "An error occured while using the portaudio stream\n" );

    fprintf( stderr, "Error number: %d\n", err );

    fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );

    return 0;

}

#endif /* PINK_TEST */