File size: 7,576 Bytes
83418c6
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
/** @file patest_multi_sine.c
    @ingroup test_src
    @brief Play a different sine wave on each channel.
    @author Phil Burk  http://www.softsynth.com
*/
/*
 * $Id$
 *
 * 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"

#define SAMPLE_RATE       (44100)
#define FRAMES_PER_BUFFER (128)
#define FREQ_INCR         (300.0 / SAMPLE_RATE)
#define MAX_CHANNELS      (64)

#ifndef M_PI
#define M_PI  (3.14159265)
#endif

typedef struct
{
    short   interleaved;          /* Nonzero for interleaved / zero for non-interleaved. */
    int     numChannels;          /* Actually used. */
    double  phases[MAX_CHANNELS]; /* Each channel gets its' own frequency. */
}
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)
{
    int         frameIndex, channelIndex;
    float**     outputs = (float**)outputBuffer;
    paTestData* data    = (paTestData*)userData;

    (void) inputBuffer;     /* Prevent unused arg warning. */
    if (data->interleaved)
        {
        float *out = (float*)outputBuffer;      /* interleaved version */
        for( frameIndex=0; frameIndex<(int)framesPerBuffer; frameIndex++ )
            {
            for( channelIndex=0; channelIndex<data->numChannels; channelIndex++ )
                {
                /* Output sine wave on every channel. */
                *out++ = (float) sin(data->phases[channelIndex]);

                /* Play each channel at a higher frequency. */
                data->phases[channelIndex] += FREQ_INCR * (4 + channelIndex);
                if( data->phases[channelIndex] >= (2.0 * M_PI) ) data->phases[channelIndex] -= (2.0 * M_PI);
                }
            }
        }
    else
        {
        for( frameIndex=0; frameIndex<(int)framesPerBuffer; frameIndex++ )
            {
            for( channelIndex=0; channelIndex<data->numChannels; channelIndex++ )
                {
                /* Output sine wave on every channel. */
                outputs[channelIndex][frameIndex] = (float) sin(data->phases[channelIndex]);

                /* Play each channel at a higher frequency. */
                data->phases[channelIndex] += FREQ_INCR * (4 + channelIndex);
                if( data->phases[channelIndex] >= (2.0 * M_PI) ) data->phases[channelIndex] -= (2.0 * M_PI);
                }
            }
        }
    return 0;
}

/*******************************************************************/
int test(short interleaved)
{
    PaStream*           stream;
    PaStreamParameters  outputParameters;
    PaError             err;
    const PaDeviceInfo* pdi;
    paTestData          data;
    short               n;

    outputParameters.device = Pa_GetDefaultOutputDevice();  /* Default output device, max channels. */
    if (outputParameters.device == paNoDevice) {
        fprintf(stderr,"Error: No default output device.\n");
        return paInvalidDevice;
    }
    pdi = Pa_GetDeviceInfo(outputParameters.device);
    outputParameters.channelCount = pdi->maxOutputChannels;
    if (outputParameters.channelCount > MAX_CHANNELS)
        outputParameters.channelCount = MAX_CHANNELS;
    outputParameters.sampleFormat = paFloat32;              /* 32 bit floating point output */
    outputParameters.suggestedLatency = pdi->defaultLowOutputLatency;
    outputParameters.hostApiSpecificStreamInfo = NULL;

    data.interleaved = interleaved;
    data.numChannels = outputParameters.channelCount;
    for (n = 0; n < data.numChannels; n++)
        data.phases[n] = 0.0; /* Phases wrap and maybe don't need initialisation. */
    printf("%d ", data.numChannels);
    if (interleaved)
        printf("interleaved ");
    else
        {
        printf(" non-interleaved ");
        outputParameters.sampleFormat |= paNonInterleaved;
        }
    printf("channels.\n");

    err = Pa_OpenStream(&stream,
                        NULL,               /* No input. */
                        &outputParameters,
                        SAMPLE_RATE,        /* Sample rate. */
                        FRAMES_PER_BUFFER,  /* Frames per buffer. */
                        paClipOff,          /* Samples never out of range, no clipping. */
                        patestCallback,
                        &data);
    if (err == paNoError)
        {
        err = Pa_StartStream(stream);
        if (err == paNoError)
            {
            printf("Hit ENTER to stop this test.\n");
            getchar();
            err = Pa_StopStream(stream);
            }
        Pa_CloseStream( stream );
        }
    return err;
}


/*******************************************************************/
int main(void)
{
    PaError err;

    printf("PortAudio Test: output sine wave on each channel.\n" );

    err = Pa_Initialize();
    if (err != paNoError)
        goto done;

    err = test(1);          /* 1 means interleaved. */
    if (err != paNoError)
        goto done;

    err = test(0);          /* 0 means not interleaved. */
    if (err != paNoError)
        goto done;

    printf("Test finished.\n");
done:
    if (err)
        {
        fprintf(stderr, "An error occurred while using the portaudio stream\n");
        fprintf(stderr, "Error number: %d\n", err );
        fprintf(stderr, "Error message: %s\n", Pa_GetErrorText(err));
        }
    Pa_Terminate();
    return 0;
}