PortAudio 2.0

paex_sine.c
Go to the documentation of this file.
1
7/*
8 * $Id$
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#include <stdio.h>
45#include <math.h>
46#include "portaudio.h"
47
48#define NUM_SECONDS (5)
49#define SAMPLE_RATE (44100)
50#define FRAMES_PER_BUFFER (64)
51
52#ifndef M_PI
53#define M_PI (3.14159265)
54#endif
55
56#define TABLE_SIZE (200)
57 typedef struct
58{
59 float sine[TABLE_SIZE];
60 int left_phase;
61 int right_phase;
62 char message[20];
63}
64 paTestData;
65
66/* This routine will be called by the PortAudio engine when audio is needed.
67** It may called at interrupt level on some machines so don't do anything
68** that could mess up the system like calling malloc() or free().
69*/
70 static int patestCallback( const void *inputBuffer, void *outputBuffer,
71 unsigned long framesPerBuffer,
72 const PaStreamCallbackTimeInfo* timeInfo,
73 PaStreamCallbackFlags statusFlags,
74 void *userData )
75{
76 paTestData *data = (paTestData*)userData;
77 float *out = (float*)outputBuffer;
78 unsigned long i;
79
80 (void) timeInfo; /* Prevent unused variable warnings. */
81 (void) statusFlags;
82 (void) inputBuffer;
83
84 for( i=0; i<framesPerBuffer; i++ )
85 {
86 *out++ = data->sine[data->left_phase]; /* left */
87 *out++ = data->sine[data->right_phase]; /* right */
88 data->left_phase += 1;
89 if( data->left_phase >= TABLE_SIZE ) data->left_phase -= TABLE_SIZE;
90 data->right_phase += 3; /* higher pitch so we can distinguish left and right. */
91 if( data->right_phase >= TABLE_SIZE ) data->right_phase -= TABLE_SIZE;
92 }
93
94 return paContinue;
95}
96
97/*
98 * This routine is called by portaudio when playback is done.
99 */
100 static void StreamFinished( void* userData )
101{
102 paTestData *data = (paTestData *) userData;
103 printf( "Stream Completed: %s\n", data->message );
104}
105
106/*******************************************************************/
107 int main(void);
108 int main(void)
109{
110 PaStreamParameters outputParameters;
111 PaStream *stream;
112 PaError err;
113 paTestData data;
114 int i;
115
116 printf("PortAudio Test: output sine wave. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER);
117
118 /* initialise sinusoidal wavetable */
119 for( i=0; i<TABLE_SIZE; i++ )
120 {
121 data.sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. );
122 }
123 data.left_phase = data.right_phase = 0;
124
125 err = Pa_Initialize();
126 if( err != paNoError ) goto error;
127
128 outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */
129 if (outputParameters.device == paNoDevice) {
130 fprintf(stderr,"Error: No default output device.\n");
131 goto error;
132 }
133 outputParameters.channelCount = 2; /* stereo output */
134 outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */
135 outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;
136 outputParameters.hostApiSpecificStreamInfo = NULL;
137
138 err = Pa_OpenStream(
139 &stream,
140 NULL, /* no input */
141 &outputParameters,
142 SAMPLE_RATE,
143 FRAMES_PER_BUFFER,
144 paClipOff, /* we won't output out of range samples so don't bother clipping them */
145 patestCallback,
146 &data );
147 if( err != paNoError ) goto error;
148
149 sprintf( data.message, "No Message" );
150 err = Pa_SetStreamFinishedCallback( stream, &StreamFinished );
151 if( err != paNoError ) goto error;
152
153 err = Pa_StartStream( stream );
154 if( err != paNoError ) goto error;
155
156 printf("Play for %d seconds.\n", NUM_SECONDS );
157 Pa_Sleep( NUM_SECONDS * 1000 );
158
159 err = Pa_StopStream( stream );
160 if( err != paNoError ) goto error;
161
162 err = Pa_CloseStream( stream );
163 if( err != paNoError ) goto error;
164
165 Pa_Terminate();
166 printf("Test finished.\n");
167
168 return err;
169error:
170 Pa_Terminate();
171 fprintf( stderr, "An error occurred while using the portaudio stream\n" );
172 fprintf( stderr, "Error number: %d\n", err );
173 fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
174 return err;
175}
portaudio.h
The portable PortAudio API.
Pa_Terminate
PaError Pa_Terminate(void)
PaStream
void PaStream
Definition: portaudio.h:635
Pa_Sleep
void Pa_Sleep(long msec)
paFloat32
#define paFloat32
Definition: portaudio.h:487
Pa_OpenStream
PaError Pa_OpenStream(PaStream **stream, const PaStreamParameters *inputParameters, const PaStreamParameters *outputParameters, double sampleRate, unsigned long framesPerBuffer, PaStreamFlags streamFlags, PaStreamCallback *streamCallback, void *userData)
PaError
int PaError
Definition: portaudio.h:121
PaStreamCallbackFlags
unsigned long PaStreamCallbackFlags
Definition: portaudio.h:712
Pa_StartStream
PaError Pa_StartStream(PaStream *stream)
paClipOff
#define paClipOff
Definition: portaudio.h:661
paNoDevice
#define paNoDevice
Definition: portaudio.h:220
Pa_CloseStream
PaError Pa_CloseStream(PaStream *stream)
Pa_SetStreamFinishedCallback
PaError Pa_SetStreamFinishedCallback(PaStream *stream, PaStreamFinishedCallback *streamFinishedCallback)
Pa_GetDeviceInfo
const PaDeviceInfo * Pa_GetDeviceInfo(PaDeviceIndex device)
Pa_Initialize
PaError Pa_Initialize(void)
Pa_GetDefaultOutputDevice
PaDeviceIndex Pa_GetDefaultOutputDevice(void)
Pa_GetErrorText
const char * Pa_GetErrorText(PaError errorCode)
paContinue
@ paContinue
Definition: portaudio.h:755
Pa_StopStream
PaError Pa_StopStream(PaStream *stream)
PaStreamCallbackTimeInfo
Definition: portaudio.h:699
PaStreamParameters
Definition: portaudio.h:539
PaStreamParameters::channelCount
int channelCount
Definition: portaudio.h:553
PaStreamParameters::suggestedLatency
PaTime suggestedLatency
Definition: portaudio.h:572
PaStreamParameters::sampleFormat
PaSampleFormat sampleFormat
Definition: portaudio.h:559
PaStreamParameters::device
PaDeviceIndex device
Definition: portaudio.h:546
PaStreamParameters::hostApiSpecificStreamInfo
void * hostApiSpecificStreamInfo
Definition: portaudio.h:579
paTestData
Definition: paex_mono_asio_channel_select.c:66