portaudio/pablio/test_w_saw.c

/*
 * $Id: test_w_saw.c 1083 2006-08-23 07:30:49Z rossb $
 * test_w_saw.c
 * Generate stereo sawtooth waveforms.
 *
 * Author: Phil Burk, http://www.softsynth.com
 *
 * This program uses PABLIO, the Portable Audio Blocking I/O Library.
 * PABLIO is built on top of PortAudio, the 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 <stdlib.h>
#include <math.h>
#include "pablio.h"
#include <string.h>

#define SAMPLE_RATE         (44100)
#define NUM_SECONDS             (6)
#define SAMPLES_PER_FRAME       (2)

#define FREQUENCY           (220.0f)
#define PHASE_INCREMENT     (2.0f * FREQUENCY / SAMPLE_RATE)
#define FRAMES_PER_BLOCK    (100)

float   samples[FRAMES_PER_BLOCK][SAMPLES_PER_FRAME];
float   phases[SAMPLES_PER_FRAME];

/*******************************************************************/
int main(void);
int main(void)
{
    int             i,j;
    PaError         err;
    PABLIO_Stream  *aOutStream;

    printf("Generate sawtooth waves using PABLIO.\n");
    fflush(stdout);

    /* Open simplified blocking I/O layer on top of PortAudio. */
    err = OpenAudioStream( &aOutStream, SAMPLE_RATE, paFloat32,
                           (PABLIO_WRITE | PABLIO_STEREO) );
    if( err != paNoError ) goto error;

    /* Initialize oscillator phases. */
    phases[0] = 0.0;
    phases[1] = 0.0;

    for( i=0; i<(NUM_SECONDS * SAMPLE_RATE); i += FRAMES_PER_BLOCK )
    {
        /* Generate sawtooth waveforms in a block for efficiency. */
        for( j=0; j<FRAMES_PER_BLOCK; j++ )
        {
            /* Generate a sawtooth wave by incrementing a variable. */
            phases[0] += PHASE_INCREMENT;
            /* The signal range is -1.0 to +1.0 so wrap around if we go over. */
            if( phases[0] > 1.0f ) phases[0] -= 2.0f;
            samples[j][0] = phases[0];

            /* On the second channel, generate a sawtooth wave a fifth higher. */
            phases[1] += PHASE_INCREMENT * (3.0f / 2.0f);
            if( phases[1] > 1.0f ) phases[1] -= 2.0f;
            samples[j][1] = phases[1];
        }

        /* Write samples to output. */
        WriteAudioStream( aOutStream, samples, FRAMES_PER_BLOCK );
    }

    CloseAudioStream( aOutStream );

    printf("Sawtooth sound test complete.\n" );
    fflush(stdout);
    return 0;

error:
    fprintf( stderr, "An error occured while using PABLIO\n" );
    fprintf( stderr, "Error number: %d\n", err );
    fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
    return -1;
}
1	william	31	/*
2			* $Id: test_w_saw.c 1083 2006-08-23 07:30:49Z rossb $
3			* test_w_saw.c
4			* Generate stereo sawtooth waveforms.
5			*
6			* Author: Phil Burk, http://www.softsynth.com
7			*
8			* This program uses PABLIO, the Portable Audio Blocking I/O Library.
9			* PABLIO is built on top of PortAudio, the Portable Audio Library.
10			*
11			* For more information see: http://www.portaudio.com
12			* Copyright (c) 1999-2000 Ross Bencina and Phil Burk
13			*
14			* Permission is hereby granted, free of charge, to any person obtaining
15			* a copy of this software and associated documentation files
16			* (the "Software"), to deal in the Software without restriction,
17			* including without limitation the rights to use, copy, modify, merge,
18			* publish, distribute, sublicense, and/or sell copies of the Software,
19			* and to permit persons to whom the Software is furnished to do so,
20			* subject to the following conditions:
21			*
22			* The above copyright notice and this permission notice shall be
23			* included in all copies or substantial portions of the Software.
24			*
25			* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26			* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27			* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
28			* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
29			* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
30			* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
31			* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
32			*/
33
34			/*
35			* The text above constitutes the entire PortAudio license; however,
36			* the PortAudio community also makes the following non-binding requests:
37			*
38			* Any person wishing to distribute modifications to the Software is
39			* requested to send the modifications to the original developer so that
40			* they can be incorporated into the canonical version. It is also
41			* requested that these non-binding requests be included along with the
42			* license above.
43			*/
44
45			#include <stdio.h>
46			#include <stdlib.h>
47			#include <math.h>
48			#include "pablio.h"
49			#include <string.h>
50
51			#define SAMPLE_RATE (44100)
52			#define NUM_SECONDS (6)
53			#define SAMPLES_PER_FRAME (2)
54
55			#define FREQUENCY (220.0f)
56			#define PHASE_INCREMENT (2.0f * FREQUENCY / SAMPLE_RATE)
57			#define FRAMES_PER_BLOCK (100)
58
59			float samples[FRAMES_PER_BLOCK][SAMPLES_PER_FRAME];
60			float phases[SAMPLES_PER_FRAME];
61
62			/*******************************************************************/
63			int main(void);
64			int main(void)
65			{
66			int i,j;
67			PaError err;
68			PABLIO_Stream *aOutStream;
69
70			printf("Generate sawtooth waves using PABLIO.\n");
71			fflush(stdout);
72
73			/* Open simplified blocking I/O layer on top of PortAudio. */
74			err = OpenAudioStream( &aOutStream, SAMPLE_RATE, paFloat32,
75			(PABLIO_WRITE \| PABLIO_STEREO) );
76			if( err != paNoError ) goto error;
77
78			/* Initialize oscillator phases. */
79			phases[0] = 0.0;
80			phases[1] = 0.0;
81
82			for( i=0; i<(NUM_SECONDS * SAMPLE_RATE); i += FRAMES_PER_BLOCK )
83			{
84			/* Generate sawtooth waveforms in a block for efficiency. */
85			for( j=0; j<FRAMES_PER_BLOCK; j++ )
86			{
87			/* Generate a sawtooth wave by incrementing a variable. */
88			phases[0] += PHASE_INCREMENT;
89			/* The signal range is -1.0 to +1.0 so wrap around if we go over. */
90			if( phases[0] > 1.0f ) phases[0] -= 2.0f;
91			samples[j][0] = phases[0];
92
93			/* On the second channel, generate a sawtooth wave a fifth higher. */
94			phases[1] += PHASE_INCREMENT * (3.0f / 2.0f);
95			if( phases[1] > 1.0f ) phases[1] -= 2.0f;
96			samples[j][1] = phases[1];
97			}
98
99			/* Write samples to output. */
100			WriteAudioStream( aOutStream, samples, FRAMES_PER_BLOCK );
101			}
102
103			CloseAudioStream( aOutStream );
104
105			printf("Sawtooth sound test complete.\n" );
106			fflush(stdout);
107			return 0;
108
109			error:
110			fprintf( stderr, "An error occured while using PABLIO\n" );
111			fprintf( stderr, "Error number: %d\n", err );
112			fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
113			return -1;
114			}