/* * $Id: debug_sine.c 1083 2006-08-23 07:30:49Z rossb $ * debug_sine.c * Play a sine sweep using the Portable Audio api for several seconds. * Hacked test for debugging PA. * * Author: Phil Burk <philburk@softsynth.com> * * 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 OUTPUT_DEVICE       (Pa_GetDefaultOutputDeviceID())//#define OUTPUT_DEVICE       (11)#define NUM_SECONDS         (8)#define SLEEP_DUR           (800)#define SAMPLE_RATE         (44100)#define FRAMES_PER_BUFFER   (256)#if 0#define MIN_LATENCY_MSEC    (200)#define NUM_BUFFERS         ((MIN_LATENCY_MSEC * SAMPLE_RATE) / (FRAMES_PER_BUFFER * 1000))#else#define NUM_BUFFERS         (0)#endif#define MIN_FREQ            (100.0f)#define MAX_FREQ            (4000.0f)#define FREQ_SCALAR         (1.00002f)#define CalcPhaseIncrement(freq)  (freq/SAMPLE_RATE)#ifndef M_PI#define M_PI  (3.14159265)#endif#define TABLE_SIZE   (400)typedef struct{    float sine[TABLE_SIZE + 1]; // add one for guard point for interpolation    float phase_increment;    float left_phase;    float right_phase;    unsigned int framesToGo;}paTestData;/* Convert phase between and 1.0 to sine value * using linear interpolation. */float LookupSine( paTestData *data, float phase );float LookupSine( paTestData *data, float phase ){    float fIndex = phase*TABLE_SIZE;    int   index = (int) fIndex;    float fract = fIndex - index;    float lo = data->sine[index];    float hi = data->sine[index+1];    float val = lo + fract*(hi-lo);    return val;}/* 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( void *inputBuffer, void *outputBuffer,                           unsigned long framesPerBuffer,                           PaTimestamp outTime, void *userData ){    paTestData *data = (paTestData*)userData;    float *out = (float*)outputBuffer;    int      framesToCalc;    int i;    int finished = 0;    (void) outTime; /* Prevent unused variable warnings. */    (void) inputBuffer;    if( data->framesToGo < framesPerBuffer )    {        framesToCalc = data->framesToGo;        data->framesToGo = 0;        finished = 1;    }    else    {        framesToCalc = framesPerBuffer;        data->framesToGo -= framesPerBuffer;    }    for( i=0; i<framesToCalc; i++ )    {        *out++ = LookupSine(data, data->left_phase);  /* left */        *out++ = LookupSine(data, data->right_phase);  /* right */        data->left_phase += data->phase_increment;        if( data->left_phase >= 1.0f ) data->left_phase -= 1.0f;        data->right_phase += (data->phase_increment * 1.5f); /* fifth above */        if( data->right_phase >= 1.0f ) data->right_phase -= 1.0f;        /* sweep frequency then start over. */        data->phase_increment *= FREQ_SCALAR;        if( data->phase_increment > CalcPhaseIncrement(MAX_FREQ) ) data->phase_increment = CalcPhaseIncrement(MIN_FREQ);    }    /* zero remainder of final buffer */    for( ; i<(int)framesPerBuffer; i++ )    {        *out++ = 0; /* left */        *out++ = 0; /* right */    }    return finished;}/*******************************************************************/int main(void);int main(void){    PortAudioStream *stream;    PaError err;    paTestData data;    int i;    int totalSamps;    printf("PortAudio Test: output sine sweep. ask for %d buffers\n", NUM_BUFFERS );    /* initialise sinusoidal wavetable */    for( i=0; i<TABLE_SIZE; i++ )    {        data.sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. );    }    data.sine[TABLE_SIZE] = data.sine[0]; // set guard point    data.left_phase = data.right_phase = 0.0;    data.phase_increment = CalcPhaseIncrement(MIN_FREQ);    data.framesToGo = totalSamps =  NUM_SECONDS * SAMPLE_RATE; /* Play for a few seconds. */    printf("totalSamps = %d\n", totalSamps );    err = Pa_Initialize();    if( err != paNoError ) goto error;    printf("PortAudio Test: output device = %d\n", OUTPUT_DEVICE );    err = Pa_OpenStream(              &stream,              paNoDevice,              0,              /* no input */              paFloat32,  /* 32 bit floating point input */              NULL,              OUTPUT_DEVICE,              2,              /* stereo output */              paFloat32,      /* 32 bit floating point output */              NULL,              SAMPLE_RATE,              FRAMES_PER_BUFFER,              NUM_BUFFERS,    /* number of buffers, if zero then use default minimum */              paClipOff|paDitherOff, /* 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("Is callback being called?\n");    for( i=0; i<((NUM_SECONDS+1)*1000); i+=SLEEP_DUR )    {        printf("data.framesToGo = %d\n", data.framesToGo ); fflush(stdout);        Pa_Sleep( SLEEP_DUR );    }    /* Stop sound until ENTER hit. */    printf("Call Pa_StopStream()\n");    err = Pa_StopStream( 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;}