/** @file patest_write_sine.c	@ingroup test_src	@brief Play a sine wave for several seconds using the blocking API (Pa_WriteStream())	@author Ross Bencina <rossb@audiomulch.com>    @author Phil Burk <philburk@softsynth.com>*//* * $Id: patest_write_sine.c 1097 2006-08-26 08:27:53Z rossb $ * * 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 NUM_SECONDS         (5)#define SAMPLE_RATE         (44100)#define FRAMES_PER_BUFFER   (1024)#ifndef M_PI#define M_PI  (3.14159265)#endif#define TABLE_SIZE   (200)int main(void);int main(void){    PaStreamParameters outputParameters;    PaStream *stream;    PaError err;    float buffer[FRAMES_PER_BUFFER][2]; /* stereo output buffer */    float sine[TABLE_SIZE]; /* sine wavetable */    int left_phase = 0;    int right_phase = 0;    int left_inc = 1;    int right_inc = 3; /* higher pitch so we can distinguish left and right. */    int i, j, k;    int bufferCount;        printf("PortAudio Test: output sine wave. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER);        /* initialise sinusoidal wavetable */    for( i=0; i<TABLE_SIZE; i++ )    {        sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. );    }        err = Pa_Initialize();    if( err != paNoError ) goto error;    outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */    outputParameters.channelCount = 2;       /* stereo output */    outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */    outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;    outputParameters.hostApiSpecificStreamInfo = NULL;    err = Pa_OpenStream(              &stream,              NULL, /* no input */              &outputParameters,              SAMPLE_RATE,              FRAMES_PER_BUFFER,              paClipOff,      /* we won't output out of range samples so don't bother clipping them */              NULL, /* no callback, use blocking API */              NULL ); /* no callback, so no callback userData */    if( err != paNoError ) goto error;    printf( "Play 3 times, higher each time.\n" );        for( k=0; k < 3; ++k )    {        err = Pa_StartStream( stream );        if( err != paNoError ) goto error;        printf("Play for %d seconds.\n", NUM_SECONDS );        bufferCount = ((NUM_SECONDS * SAMPLE_RATE) / FRAMES_PER_BUFFER);        for( i=0; i < bufferCount; i++ )        {            for( j=0; j < FRAMES_PER_BUFFER; j++ )            {                buffer[j][0] = sine[left_phase];  /* left */                buffer[j][1] = sine[right_phase];  /* right */                left_phase += left_inc;                if( left_phase >= TABLE_SIZE ) left_phase -= TABLE_SIZE;                right_phase += right_inc;                if( right_phase >= TABLE_SIZE ) right_phase -= TABLE_SIZE;            }            err = Pa_WriteStream( stream, buffer, FRAMES_PER_BUFFER );            if( err != paNoError ) goto error;        }           err = Pa_StopStream( stream );        if( err != paNoError ) goto error;        ++left_inc;        ++right_inc;        Pa_Sleep( 1000 );    }    err = Pa_CloseStream( stream );    if( err != paNoError ) goto error;    Pa_Terminate();    printf("Test finished.\n");        return err;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 err;}