/[pcsx2_0.9.7]/trunk/3rdparty/portaudio/pablio/test_w_saw.c
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Revision 273 - (show annotations) (download)
Fri Nov 12 01:10:22 2010 UTC (9 years, 9 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 /*
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 }

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