/* * $Id: debug_sine_formats.c 1083 2006-08-23 07:30:49Z rossb $ * patest_sine_formats.c * Play a sine wave using the Portable Audio api for several seconds. * Test various data formats. * * Author: Phil Burk * * 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        (10)#define SAMPLE_RATE        (44100)#define FRAMES_PER_BUFFER  (256)#define LEFT_FREQ          (SAMPLE_RATE/512.0)  /* So we hit 1.0 */#define RIGHT_FREQ         (500.0)#define AMPLITUDE          (1.0)/* Select ONE format for testing. */#define TEST_UINT8    (1)#define TEST_INT8     (0)#define TEST_INT16    (0)#define TEST_FLOAT32  (0)#if TEST_UINT8#define TEST_FORMAT         paUInt8typedef unsigned char       SAMPLE_t;#define SAMPLE_ZERO         (0x80)#define DOUBLE_TO_SAMPLE(x) (SAMPLE_ZERO + (SAMPLE_t)(127.0 * (x)))#define FORMAT_NAME         "Unsigned 8 Bit"#elif TEST_INT8#define TEST_FORMAT         paInt8typedef char                SAMPLE_t;#define SAMPLE_ZERO         (0)#define DOUBLE_TO_SAMPLE(x) (SAMPLE_ZERO + (SAMPLE_t)(127.0 * (x)))#define FORMAT_NAME         "Signed 8 Bit"#elif TEST_INT16#define TEST_FORMAT         paInt16typedef short               SAMPLE_t;#define SAMPLE_ZERO         (0)#define DOUBLE_TO_SAMPLE(x) (SAMPLE_ZERO + (SAMPLE_t)(32767 * (x)))#define FORMAT_NAME         "Signed 16 Bit"#elif TEST_FLOAT32#define TEST_FORMAT         paFloat32typedef float               SAMPLE_t;#define SAMPLE_ZERO         (0.0)#define DOUBLE_TO_SAMPLE(x) ((SAMPLE_t)(x))#define FORMAT_NAME         "Float 32 Bit"#endif#ifndef M_PI#define M_PI  (3.14159265)#endiftypedef struct{    double left_phase;    double right_phase;    unsigned int framesToGo;}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( void *inputBuffer, void *outputBuffer,                           unsigned long framesPerBuffer,                           PaTimestamp outTime, void *userData ){    paTestData *data = (paTestData*)userData;    SAMPLE_t *out = (SAMPLE_t *)outputBuffer;    SAMPLE_t sample;    int i;    int framesToCalc;    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++ )    {        data->left_phase += (LEFT_FREQ / SAMPLE_RATE);        if( data->left_phase > 1.0) data->left_phase -= 1.0;        sample = DOUBLE_TO_SAMPLE( AMPLITUDE * sin( (data->left_phase * M_PI * 2. ))); /**/        *out++ = sample;/*        *out++ = sample; /**//*        *out++ = 0;  /**/        data->right_phase += (RIGHT_FREQ / SAMPLE_RATE);        if( data->right_phase > 1.0) data->right_phase -= 1.0;        *out++ = DOUBLE_TO_SAMPLE( AMPLITUDE * sin( (data->right_phase * M_PI * 2. ))); /**//*        *out++ = 0;  /* */    }    /* zero remainder of final buffer */    for( ; i<(int)framesPerBuffer; i++ )    {        *out++ = SAMPLE_ZERO; /* left */        *out++ = SAMPLE_ZERO; /* right */    }    return finished;}/*******************************************************************/int main(void);int main(void){    PortAudioStream *stream;    PaError err;    paTestData data;    int totalSamps;    printf("PortAudio Test: output " FORMAT_NAME "\n");    data.left_phase = data.right_phase = 0.0;    data.framesToGo = totalSamps =  NUM_SECONDS * SAMPLE_RATE; /* Play for a few seconds. */    err = Pa_Initialize();    if( err != paNoError ) goto error;    err = Pa_OpenStream(              &stream,              paNoDevice,/* default input device */              0,              /* no input */              TEST_FORMAT,              NULL,              Pa_GetDefaultOutputDeviceID(), /* default output device */              2,          /* stereo output */              TEST_FORMAT,              NULL,              SAMPLE_RATE,              FRAMES_PER_BUFFER,              0,              /* number of buffers, if zero then use default minimum */              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("Waiting %d seconds for sound to finish.\n", NUM_SECONDS );    while( Pa_StreamActive( stream ) ) Pa_Sleep(10);    err = Pa_CloseStream( stream );    if( err != paNoError ) goto error;    Pa_Terminate();    printf("PortAudio Test Finished: " FORMAT_NAME "\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;}