File: paex_mono_asio_channel_select.c

package info (click to toggle)
portaudio19 19.6.0-1
  • links: PTS, VCS
  • area: main
  • in suites: buster, stretch
  • size: 7,980 kB
  • ctags: 13,089
  • sloc: ansic: 56,444; sh: 13,640; cpp: 10,851; java: 677; makefile: 339; python: 143
file content (167 lines) | stat: -rw-r--r-- 5,913 bytes parent folder | download | duplicates (10)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
/** @file paex_mono_asio_channel_select.c
	@ingroup examples_src
	@brief Play a monophonic sine wave on a specific ASIO channel.
	@author Ross Bencina <rossb@audiomulch.com>
	@author Phil Burk <philburk@softsynth.com>
*/
/*
 * $Id$
 *
 * Authors:
 *    Ross Bencina <rossb@audiomulch.com>
 *    Phil Burk <philburk@softsynth.com>
 *
 * This program uses the PortAudio 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 <math.h>
#include "portaudio.h"
#include "pa_asio.h"

#define NUM_SECONDS   (10)
#define SAMPLE_RATE   (44100)
#define AMPLITUDE     (0.8)
#define FRAMES_PER_BUFFER  (64)
#define OUTPUT_DEVICE Pa_GetDefaultOutputDevice()

#ifndef M_PI
#define M_PI  (3.14159265)
#endif

#define TABLE_SIZE   (200)
typedef struct
{
    float sine[TABLE_SIZE];
    int phase;
}
paTestData;

/* This routine will be called by the PortAudio engine when audio is needed.
** It may called at interrupt level on some machines so don't do anything
** that could mess up the system like calling malloc() or free().
*/
static int patestCallback( const void *inputBuffer, void *outputBuffer,
                            unsigned long framesPerBuffer,
                            const PaStreamCallbackTimeInfo* timeInfo,
                            PaStreamCallbackFlags statusFlags,
                            void *userData )
{
    paTestData *data = (paTestData*)userData;
    float *out = (float*)outputBuffer;
    unsigned long i;
    int finished = 0;
    /* avoid unused variable warnings */
    (void) inputBuffer;
    (void) timeInfo;
    (void) statusFlags;
    for( i=0; i<framesPerBuffer; i++ )
    {
        *out++ = data->sine[data->phase];  /* left */
        data->phase += 1;
        if( data->phase >= TABLE_SIZE ) data->phase -= TABLE_SIZE;
    }
    return finished;
}

/*******************************************************************/
int main(void);
int main(void)
{
    PaStreamParameters outputParameters;
    PaAsioStreamInfo asioOutputInfo;
    PaStream *stream;
    PaError err;
    paTestData data;
    int outputChannelSelectors[1];
    int i;
    printf("PortAudio Test: output MONO sine wave. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER);
    /* initialise sinusoidal wavetable */
    for( i=0; i<TABLE_SIZE; i++ )
    {
        data.sine[i] = (float) (AMPLITUDE * sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. ));
    }
    data.phase = 0;
    
    err = Pa_Initialize();
    if( err != paNoError ) goto error;

    outputParameters.device = OUTPUT_DEVICE;
    outputParameters.channelCount = 1;       /* MONO output */
    outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */
    outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;

	/* Use an ASIO specific structure. WARNING - this is not portable. */
    asioOutputInfo.size = sizeof(PaAsioStreamInfo);
    asioOutputInfo.hostApiType = paASIO;
    asioOutputInfo.version = 1;
    asioOutputInfo.flags = paAsioUseChannelSelectors;
    outputChannelSelectors[0] = 1; /* skip channel 0 and use the second (right) ASIO device channel */
    asioOutputInfo.channelSelectors = outputChannelSelectors;
    outputParameters.hostApiSpecificStreamInfo = &asioOutputInfo;

    err = Pa_OpenStream(
              &stream,
              NULL, /* no input */
              &outputParameters,
              SAMPLE_RATE,
              FRAMES_PER_BUFFER,
              paClipOff,      /* we won't output out of range samples so don't bother clipping them */
              patestCallback,
              &data );
    if( err != paNoError ) goto error;

    err = Pa_StartStream( stream );
    if( err != paNoError ) goto error;
    
    printf("Play for %d seconds.\n", NUM_SECONDS ); fflush(stdout);
    Pa_Sleep( NUM_SECONDS * 1000 );

    err = Pa_StopStream( stream );
    if( err != paNoError ) goto error;
    
    err = Pa_CloseStream( stream );
    if( err != paNoError ) goto error;
    
    Pa_Terminate();
    printf("Test finished.\n");
    return err;
error:
    Pa_Terminate();
    fprintf( stderr, "An error occured while using the portaudio stream\n" );
    fprintf( stderr, "Error number: %d\n", err );
    fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
    return err;
}