/[pcsx2_0.9.7]/trunk/3rdparty/portaudio/pablio/test_w_saw8.c
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Annotation of /trunk/3rdparty/portaudio/pablio/test_w_saw8.c

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Revision 273 - (hide annotations) (download)
Fri Nov 12 01:10:22 2010 UTC (9 years, 3 months ago) by william
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Auto Commited Import of: pcsx2-0.9.7-DEBUG (upstream: v0.9.7.4013 local: v0.9.7.197-latest) in ./trunk
1 william 31 /*
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 william 273 * The text above constitutes the entire PortAudio license; however,
36 william 31 * 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 william 273 * they can be incorporated into the canonical version. It is also
41     * requested that these non-binding requests be included along with the
42 william 31 * 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     }

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