cannam@140: /*
cannam@140:  * $Id$
cannam@140:  * test_w_saw8.c
cannam@140:  * Generate stereo 8 bit sawtooth waveforms.
cannam@140:  *
cannam@140:  * Author: Phil Burk, http://www.softsynth.com
cannam@140:  *
cannam@140:  * This program uses PABLIO, the Portable Audio Blocking I/O Library.
cannam@140:  * PABLIO is built on top of PortAudio, the Portable Audio Library.
cannam@140:  *
cannam@140:  * For more information see: http://www.portaudio.com
cannam@140:  * Copyright (c) 1999-2000 Ross Bencina and Phil Burk
cannam@140:  *
cannam@140:  * Permission is hereby granted, free of charge, to any person obtaining
cannam@140:  * a copy of this software and associated documentation files
cannam@140:  * (the "Software"), to deal in the Software without restriction,
cannam@140:  * including without limitation the rights to use, copy, modify, merge,
cannam@140:  * publish, distribute, sublicense, and/or sell copies of the Software,
cannam@140:  * and to permit persons to whom the Software is furnished to do so,
cannam@140:  * subject to the following conditions:
cannam@140:  *
cannam@140:  * The above copyright notice and this permission notice shall be
cannam@140:  * included in all copies or substantial portions of the Software.
cannam@140:  *
cannam@140:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
cannam@140:  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
cannam@140:  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
cannam@140:  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
cannam@140:  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
cannam@140:  * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
cannam@140:  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
cannam@140:  */
cannam@140: 
cannam@140: /*
cannam@140:  * The text above constitutes the entire PortAudio license; however, 
cannam@140:  * the PortAudio community also makes the following non-binding requests:
cannam@140:  *
cannam@140:  * Any person wishing to distribute modifications to the Software is
cannam@140:  * requested to send the modifications to the original developer so that
cannam@140:  * they can be incorporated into the canonical version. It is also 
cannam@140:  * requested that these non-binding requests be included along with the 
cannam@140:  * license above.
cannam@140:  */
cannam@140: 
cannam@140: #include <stdio.h>
cannam@140: #include <stdlib.h>
cannam@140: #include <math.h>
cannam@140: #include "pablio.h"
cannam@140: #include <string.h>
cannam@140: 
cannam@140: #define SAMPLE_RATE         (22050)
cannam@140: #define NUM_SECONDS             (6)
cannam@140: #define SAMPLES_PER_FRAME       (2)
cannam@140: 
cannam@140: 
cannam@140: #define FRAMES_PER_BLOCK    (100)
cannam@140: 
cannam@140: unsigned char   samples[FRAMES_PER_BLOCK][SAMPLES_PER_FRAME];
cannam@140: unsigned char   phases[SAMPLES_PER_FRAME];
cannam@140: 
cannam@140: /*******************************************************************/
cannam@140: int main(void);
cannam@140: int main(void)
cannam@140: {
cannam@140:     int             i,j;
cannam@140:     PaError         err;
cannam@140:     PABLIO_Stream  *aOutStream;
cannam@140: 
cannam@140:     printf("Generate unsigned 8 bit sawtooth waves using PABLIO.\n");
cannam@140:     fflush(stdout);
cannam@140: 
cannam@140:     /* Open simplified blocking I/O layer on top of PortAudio. */
cannam@140:     err = OpenAudioStream( &aOutStream, SAMPLE_RATE, paUInt8,
cannam@140:                            (PABLIO_WRITE | PABLIO_STEREO) );
cannam@140:     if( err != paNoError ) goto error;
cannam@140: 
cannam@140:     /* Initialize oscillator phases to "ground" level for paUInt8. */
cannam@140:     phases[0] = 128;
cannam@140:     phases[1] = 128;
cannam@140: 
cannam@140:     for( i=0; i<(NUM_SECONDS * SAMPLE_RATE); i += FRAMES_PER_BLOCK )
cannam@140:     {
cannam@140:         /* Generate sawtooth waveforms in a block for efficiency. */
cannam@140:         for( j=0; j<FRAMES_PER_BLOCK; j++ )
cannam@140:         {
cannam@140:             /* Generate a sawtooth wave by incrementing a variable. */
cannam@140:             phases[0] += 1;
cannam@140:             /* We don't have to do anything special to wrap when using paUint8 because
cannam@140:              * 8 bit arithmetic automatically wraps. */
cannam@140:             samples[j][0] = phases[0];
cannam@140: 
cannam@140:             /* On the second channel, generate a higher sawtooth wave. */
cannam@140:             phases[1] += 3;
cannam@140:             samples[j][1] = phases[1];
cannam@140:         }
cannam@140: 
cannam@140:         /* Write samples to output. */
cannam@140:         WriteAudioStream( aOutStream, samples, FRAMES_PER_BLOCK );
cannam@140:     }
cannam@140: 
cannam@140:     CloseAudioStream( aOutStream );
cannam@140: 
cannam@140:     printf("Sawtooth sound test complete.\n" );
cannam@140:     fflush(stdout);
cannam@140:     return 0;
cannam@140: 
cannam@140: error:
cannam@140:     fprintf( stderr, "An error occured while using PABLIO\n" );
cannam@140:     fprintf( stderr, "Error number: %d\n", err );
cannam@140:     fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
cannam@140:     return -1;
cannam@140: }