SV platform dependency builds

/** @file pa_minlat.c

        @ingroup test_src

    @brief Experiment with different numbers of buffers to determine the

        minimum latency for a computer.

        @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 <stdlib.h>

#include <math.h>

#include <string.h>

#include "portaudio.h"

#ifndef M_PI

#define M_PI  (3.14159265)

#endif

#define TWOPI (M_PI * 2.0)

#define DEFAULT_BUFFER_SIZE   (32)

typedef struct

{

    double left_phase;

    double right_phase;

}

paTestData;

/* Very simple synthesis routine to generate two sine waves. */

static int paminlatCallback( const void *inputBuffer, void *outputBuffer,

                             unsigned long framesPerBuffer,

                             const PaStreamCallbackTimeInfo* timeInfo,

                             PaStreamCallbackFlags statusFlags,

                             void *userData )

{

    paTestData *data = (paTestData*)userData;

    float *out = (float*)outputBuffer;

    unsigned int i;

    double left_phaseInc = 0.02;

    double right_phaseInc = 0.06;

    double left_phase = data->left_phase;

    double right_phase = data->right_phase;

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

    {

        left_phase += left_phaseInc;

        if( left_phase > TWOPI ) left_phase -= TWOPI;

        *out++ = (float) sin( left_phase );

        right_phase += right_phaseInc;

        if( right_phase > TWOPI ) right_phase -= TWOPI;

        *out++ = (float) sin( right_phase );

    }

    data->left_phase = left_phase;

    data->right_phase = right_phase;

    return 0;

}

int main( int argc, char **argv );

int main( int argc, char **argv )

{

    PaStreamParameters outputParameters;

    PaStream *stream;

    PaError err;

    paTestData data;

    int    go;

    int    outLatency = 0;

    int    minLatency = DEFAULT_BUFFER_SIZE * 2;

    int    framesPerBuffer;

    double sampleRate = 44100.0;

    char   str[256];

        char  *line;

    printf("pa_minlat - Determine minimum latency for your computer.\n");

    printf("  usage:         pa_minlat {userBufferSize}\n");

    printf("  for example:   pa_minlat 64\n");

    printf("Adjust your stereo until you hear a smooth tone in each speaker.\n");

    printf("Then try to find the smallest number of frames that still sounds smooth.\n");

    printf("Note that the sound will stop momentarily when you change the number of buffers.\n");

    /* Get bufferSize from command line. */

    framesPerBuffer = ( argc > 1 ) ? atol( argv[1] ) : DEFAULT_BUFFER_SIZE;

    printf("Frames per buffer = %d\n", framesPerBuffer );

    data.left_phase = data.right_phase = 0.0;

    err = Pa_Initialize();

    if( err != paNoError ) goto error;

    outLatency = sampleRate * 200.0 / 1000.0; /* 200 msec. */

    /* Try different numBuffers in a loop. */

    go = 1;

    while( go )

    {

        outputParameters.device                    = Pa_GetDefaultOutputDevice(); /* Default output device. */

        outputParameters.channelCount              = 2;                           /* Stereo output */

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

        outputParameters.suggestedLatency          = (double)outLatency / sampleRate; /* In seconds. */

        outputParameters.hostApiSpecificStreamInfo = NULL;

        printf("Latency = %d frames = %6.1f msec.\n", outLatency, outputParameters.suggestedLatency * 1000.0 );

        err = Pa_OpenStream(

                  &stream,

                  NULL, /* no input */

                  &outputParameters,

                  sampleRate,

                  framesPerBuffer,

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

                  paminlatCallback,

                  &data );

        if( err != paNoError ) goto error;

        if( stream == NULL ) goto error;

        /* Start audio. */

        err = Pa_StartStream( stream );

        if( err != paNoError ) goto error;

        /* Ask user for a new nlatency. */

        printf("\nMove windows around to see if the sound glitches.\n");

        printf("Latency now %d, enter new number of frames, or 'q' to quit: ", outLatency );

        line = fgets( str, 256, stdin );

                if( line == NULL )

                {

                        go = 0;

                }

                else

                {

                        {

                                /* Get rid of newline */

                                size_t l = strlen( str ) - 1;

                                if( str[ l ] == '\n')

                                        str[ l ] = '\0';

                        }

                        if( str[0] == 'q' ) go = 0;

                        else

                        {

                                outLatency = atol( str );

                                if( outLatency < minLatency )

                                {

                                        printf( "Latency below minimum of %d! Set to minimum!!!\n", minLatency );

                                        outLatency = minLatency;

                                }

                        }

                }

                /* Stop sound until ENTER hit. */

        err = Pa_StopStream( stream );

        if( err != paNoError ) goto error;

        err = Pa_CloseStream( stream );

        if( err != paNoError ) goto error;

    }

    printf("A good setting for latency would be somewhat higher than\n");

    printf("the minimum latency that worked.\n");

    printf("PortAudio: Test finished.\n");

    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 1;

}