PortAudio  2.0
paex_write_sine_nonint.c
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1 
7 /*
8  * $Id: patest_write_sine.c 1368 2008-03-01 00:38:27Z rossb $
9  *
10  * This program uses the PortAudio Portable Audio Library.
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 <math.h>
47 #include "portaudio.h"
48 
49 #define NUM_SECONDS (5)
50 #define SAMPLE_RATE (44100)
51 #define FRAMES_PER_BUFFER (1024)
52 
53 #ifndef M_PI
54 #define M_PI (3.14159265)
55 #endif
56 
57 #define TABLE_SIZE (200)
58 
59 
60 int main(void);
61 int main(void)
62 {
63  PaStreamParameters outputParameters;
64  PaStream *stream;
65  PaError err;
66 
67  float leftBuffer[FRAMES_PER_BUFFER];
68  float rightBuffer[FRAMES_PER_BUFFER];
69  void *buffers[2]; /* points to both non-interleaved buffers. */
70 
71  float sine[TABLE_SIZE]; /* sine wavetable */
72  int left_phase = 0;
73  int right_phase = 0;
74  int left_inc = 1;
75  int right_inc = 3; /* higher pitch so we can distinguish left and right. */
76  int i, j, k;
77  int bufferCount;
78 
79 
80  printf("PortAudio Test: output sine wave NON-INTERLEAVED. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER);
81 
82  /* initialise sinusoidal wavetable */
83  for( i=0; i<TABLE_SIZE; i++ )
84  {
85  sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. );
86  }
87 
88 
89  err = Pa_Initialize();
90  if( err != paNoError ) goto error;
91 
92  outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */
93  if (outputParameters.device == paNoDevice) {
94  fprintf(stderr,"Error: No default output device.\n");
95  goto error;
96  }
97  outputParameters.channelCount = 2; /* stereo output */
98  outputParameters.sampleFormat = paFloat32 | paNonInterleaved; /* 32 bit floating point output NON-INTERLEAVED */
99  outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;
100  outputParameters.hostApiSpecificStreamInfo = NULL;
101 
102  err = Pa_OpenStream(
103  &stream,
104  NULL, /* no input */
105  &outputParameters,
106  SAMPLE_RATE,
107  FRAMES_PER_BUFFER,
108  paClipOff, /* we won't output out of range samples so don't bother clipping them */
109  NULL, /* no callback, use blocking API */
110  NULL ); /* no callback, so no callback userData */
111  if( err != paNoError ) goto error;
112 
113 
114  printf( "Play 3 times, higher each time.\n" );
115 
116  /* Set up array of buffer pointers for Pa_WriteStream */
117  buffers[0] = leftBuffer;
118  buffers[1] = rightBuffer;
119 
120  for( k=0; k < 3; ++k )
121  {
122  err = Pa_StartStream( stream );
123  if( err != paNoError ) goto error;
124 
125  printf("Play for %d seconds.\n", NUM_SECONDS );
126 
127  bufferCount = ((NUM_SECONDS * SAMPLE_RATE) / FRAMES_PER_BUFFER);
128 
129  for( i=0; i < bufferCount; i++ )
130  {
131  for( j=0; j < FRAMES_PER_BUFFER; j++ )
132  {
133  leftBuffer[j] = sine[left_phase]; /* left */
134  rightBuffer[j] = sine[right_phase]; /* right */
135  left_phase += left_inc;
136  if( left_phase >= TABLE_SIZE ) left_phase -= TABLE_SIZE;
137  right_phase += right_inc;
138  if( right_phase >= TABLE_SIZE ) right_phase -= TABLE_SIZE;
139  }
140 
141  err = Pa_WriteStream( stream, buffers, FRAMES_PER_BUFFER );
142  if( err != paNoError ) goto error;
143  }
144 
145  err = Pa_StopStream( stream );
146  if( err != paNoError ) goto error;
147 
148  ++left_inc;
149  ++right_inc;
150 
151  Pa_Sleep( 1000 );
152  }
153 
154  err = Pa_CloseStream( stream );
155  if( err != paNoError ) goto error;
156 
157  Pa_Terminate();
158  printf("Test finished.\n");
159 
160  return err;
161 error:
162  Pa_Terminate();
163  fprintf( stderr, "An error occured while using the portaudio stream\n" );
164  fprintf( stderr, "Error number: %d\n", err );
165  fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
166  return err;
167 }