portaudio/pablio/test_w_saw8.c

/*
 * $Id: test_w_saw8.c 1083 2006-08-23 07:30:49Z rossb $
 * test_w_saw8.c
 * Generate stereo 8 bit 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         (22050)
#define NUM_SECONDS             (6)
#define SAMPLES_PER_FRAME       (2)


#define FRAMES_PER_BLOCK    (100)

unsigned char   samples[FRAMES_PER_BLOCK][SAMPLES_PER_FRAME];
unsigned char   phases[SAMPLES_PER_FRAME];

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

    printf("Generate unsigned 8 bit sawtooth waves using PABLIO.\n");
    fflush(stdout);

    /* Open simplified blocking I/O layer on top of PortAudio. */
    err = OpenAudioStream( &aOutStream, SAMPLE_RATE, paUInt8,
                           (PABLIO_WRITE | PABLIO_STEREO) );
    if( err != paNoError ) goto error;

    /* Initialize oscillator phases to "ground" level for paUInt8. */
    phases[0] = 128;
    phases[1] = 128;

    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] += 1;
            /* We don't have to do anything special to wrap when using paUint8 because
             * 8 bit arithmetic automatically wraps. */
            samples[j][0] = phases[0];

            /* On the second channel, generate a higher sawtooth wave. */
            phases[1] += 3;
            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	/*
2	* $Id: test_w_saw8.c 1083 2006-08-23 07:30:49Z rossb $
3	* test_w_saw8.c
4	* Generate stereo 8 bit 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 (22050)
52	#define NUM_SECONDS (6)
53	#define SAMPLES_PER_FRAME (2)
54
55
56	#define FRAMES_PER_BLOCK (100)
57
58	unsigned char samples[FRAMES_PER_BLOCK][SAMPLES_PER_FRAME];
59	unsigned char phases[SAMPLES_PER_FRAME];
60
61	/*******************************************************************/
62	int main(void);
63	int main(void)
64	{
65	int i,j;
66	PaError err;
67	PABLIO_Stream *aOutStream;
68
69	printf("Generate unsigned 8 bit sawtooth waves using PABLIO.\n");
70	fflush(stdout);
71
72	/* Open simplified blocking I/O layer on top of PortAudio. */
73	err = OpenAudioStream( &aOutStream, SAMPLE_RATE, paUInt8,
74	(PABLIO_WRITE \| PABLIO_STEREO) );
75	if( err != paNoError ) goto error;
76
77	/* Initialize oscillator phases to "ground" level for paUInt8. */
78	phases[0] = 128;
79	phases[1] = 128;
80
81	for( i=0; i<(NUM_SECONDS * SAMPLE_RATE); i += FRAMES_PER_BLOCK )
82	{
83	/* Generate sawtooth waveforms in a block for efficiency. */
84	for( j=0; j<FRAMES_PER_BLOCK; j++ )
85	{
86	/* Generate a sawtooth wave by incrementing a variable. */
87	phases[0] += 1;
88	/* We don't have to do anything special to wrap when using paUint8 because
89	* 8 bit arithmetic automatically wraps. */
90	samples[j][0] = phases[0];
91
92	/* On the second channel, generate a higher sawtooth wave. */
93	phases[1] += 3;
94	samples[j][1] = phases[1];
95	}
96
97	/* Write samples to output. */
98	WriteAudioStream( aOutStream, samples, FRAMES_PER_BLOCK );
99	}
100
101	CloseAudioStream( aOutStream );
102
103	printf("Sawtooth sound test complete.\n" );
104	fflush(stdout);
105	return 0;
106
107	error:
108	fprintf( stderr, "An error occured while using PABLIO\n" );
109	fprintf( stderr, "Error number: %d\n", err );
110	fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
111	return -1;
112	}