cannam@162: /*
cannam@162:  * $Id$
cannam@162:  * test_w_saw.c
cannam@162:  * Generate stereo sawtooth waveforms.
cannam@162:  *
cannam@162:  * Author: Phil Burk, http://www.softsynth.com
cannam@162:  *
cannam@162:  * This program uses PABLIO, the Portable Audio Blocking I/O Library.
cannam@162:  * PABLIO is built on top of PortAudio, the Portable Audio Library.
cannam@162:  *
cannam@162:  * For more information see: http://www.portaudio.com
cannam@162:  * Copyright (c) 1999-2000 Ross Bencina and Phil Burk
cannam@162:  *
cannam@162:  * Permission is hereby granted, free of charge, to any person obtaining
cannam@162:  * a copy of this software and associated documentation files
cannam@162:  * (the "Software"), to deal in the Software without restriction,
cannam@162:  * including without limitation the rights to use, copy, modify, merge,
cannam@162:  * publish, distribute, sublicense, and/or sell copies of the Software,
cannam@162:  * and to permit persons to whom the Software is furnished to do so,
cannam@162:  * subject to the following conditions:
cannam@162:  *
cannam@162:  * The above copyright notice and this permission notice shall be
cannam@162:  * included in all copies or substantial portions of the Software.
cannam@162:  *
cannam@162:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
cannam@162:  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
cannam@162:  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
cannam@162:  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
cannam@162:  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
cannam@162:  * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
cannam@162:  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
cannam@162:  */
cannam@162: 
cannam@162: /*
cannam@162:  * The text above constitutes the entire PortAudio license; however, 
cannam@162:  * the PortAudio community also makes the following non-binding requests:
cannam@162:  *
cannam@162:  * Any person wishing to distribute modifications to the Software is
cannam@162:  * requested to send the modifications to the original developer so that
cannam@162:  * they can be incorporated into the canonical version. It is also 
cannam@162:  * requested that these non-binding requests be included along with the 
cannam@162:  * license above.
cannam@162:  */
cannam@162: 
cannam@162: #include <stdio.h>
cannam@162: #include <stdlib.h>
cannam@162: #include <math.h>
cannam@162: #include "pablio.h"
cannam@162: #include <string.h>
cannam@162: 
cannam@162: #define SAMPLE_RATE         (44100)
cannam@162: #define NUM_SECONDS             (6)
cannam@162: #define SAMPLES_PER_FRAME       (2)
cannam@162: 
cannam@162: #define FREQUENCY           (220.0f)
cannam@162: #define PHASE_INCREMENT     (2.0f * FREQUENCY / SAMPLE_RATE)
cannam@162: #define FRAMES_PER_BLOCK    (100)
cannam@162: 
cannam@162: float   samples[FRAMES_PER_BLOCK][SAMPLES_PER_FRAME];
cannam@162: float   phases[SAMPLES_PER_FRAME];
cannam@162: 
cannam@162: /*******************************************************************/
cannam@162: int main(void);
cannam@162: int main(void)
cannam@162: {
cannam@162:     int             i,j;
cannam@162:     PaError         err;
cannam@162:     PABLIO_Stream  *aOutStream;
cannam@162: 
cannam@162:     printf("Generate sawtooth waves using PABLIO.\n");
cannam@162:     fflush(stdout);
cannam@162: 
cannam@162:     /* Open simplified blocking I/O layer on top of PortAudio. */
cannam@162:     err = OpenAudioStream( &aOutStream, SAMPLE_RATE, paFloat32,
cannam@162:                            (PABLIO_WRITE | PABLIO_STEREO) );
cannam@162:     if( err != paNoError ) goto error;
cannam@162: 
cannam@162:     /* Initialize oscillator phases. */
cannam@162:     phases[0] = 0.0;
cannam@162:     phases[1] = 0.0;
cannam@162: 
cannam@162:     for( i=0; i<(NUM_SECONDS * SAMPLE_RATE); i += FRAMES_PER_BLOCK )
cannam@162:     {
cannam@162:         /* Generate sawtooth waveforms in a block for efficiency. */
cannam@162:         for( j=0; j<FRAMES_PER_BLOCK; j++ )
cannam@162:         {
cannam@162:             /* Generate a sawtooth wave by incrementing a variable. */
cannam@162:             phases[0] += PHASE_INCREMENT;
cannam@162:             /* The signal range is -1.0 to +1.0 so wrap around if we go over. */
cannam@162:             if( phases[0] > 1.0f ) phases[0] -= 2.0f;
cannam@162:             samples[j][0] = phases[0];
cannam@162: 
cannam@162:             /* On the second channel, generate a sawtooth wave a fifth higher. */
cannam@162:             phases[1] += PHASE_INCREMENT * (3.0f / 2.0f);
cannam@162:             if( phases[1] > 1.0f ) phases[1] -= 2.0f;
cannam@162:             samples[j][1] = phases[1];
cannam@162:         }
cannam@162: 
cannam@162:         /* Write samples to output. */
cannam@162:         WriteAudioStream( aOutStream, samples, FRAMES_PER_BLOCK );
cannam@162:     }
cannam@162: 
cannam@162:     CloseAudioStream( aOutStream );
cannam@162: 
cannam@162:     printf("Sawtooth sound test complete.\n" );
cannam@162:     fflush(stdout);
cannam@162:     return 0;
cannam@162: 
cannam@162: error:
cannam@162:     fprintf( stderr, "An error occured while using PABLIO\n" );
cannam@162:     fprintf( stderr, "Error number: %d\n", err );
cannam@162:     fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
cannam@162:     return -1;
cannam@162: }