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

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Revision 273 - (hide annotations) (download)
Fri Nov 12 01:10:22 2010 UTC (10 years, 5 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_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 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 (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     }

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