PortAudio 2.0

paex_write_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
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 float buffer[FRAMES_PER_BUFFER][2]; /* stereo output buffer */
67 float sine[TABLE_SIZE]; /* sine wavetable */
68 int left_phase = 0;
69 int right_phase = 0;
70 int left_inc = 1;
71 int right_inc = 3; /* higher pitch so we can distinguish left and right. */
72 int i, j, k;
73 int bufferCount;
74
75 printf("PortAudio Test: output sine wave. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER);
76
77 /* initialise sinusoidal wavetable */
78 for( i=0; i<TABLE_SIZE; i++ )
79 {
80 sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. );
81 }
82
83
84 err = Pa_Initialize();
85 if( err != paNoError ) goto error;
86
87 outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */
88 if (outputParameters.device == paNoDevice) {
89 fprintf(stderr,"Error: No default output device.\n");
90 goto error;
91 }
92 outputParameters.channelCount = 2; /* stereo output */
93 outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */
94 outputParameters.suggestedLatency = 0.050; // Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;
95 outputParameters.hostApiSpecificStreamInfo = NULL;
96
97 err = Pa_OpenStream(
98 &stream,
99 NULL, /* no input */
100 &outputParameters,
101 SAMPLE_RATE,
102 FRAMES_PER_BUFFER,
103 paClipOff, /* we won't output out of range samples so don't bother clipping them */
104 NULL, /* no callback, use blocking API */
105 NULL ); /* no callback, so no callback userData */
106 if( err != paNoError ) goto error;
107
108
109 printf( "Play 3 times, higher each time.\n" );
110
111 for( k=0; k < 3; ++k )
112 {
113 err = Pa_StartStream( stream );
114 if( err != paNoError ) goto error;
115
116 printf("Play for %d seconds.\n", NUM_SECONDS );
117
118 bufferCount = ((NUM_SECONDS * SAMPLE_RATE) / FRAMES_PER_BUFFER);
119
120 for( i=0; i < bufferCount; i++ )
121 {
122 for( j=0; j < FRAMES_PER_BUFFER; j++ )
123 {
124 buffer[j][0] = sine[left_phase]; /* left */
125 buffer[j][1] = sine[right_phase]; /* right */
126 left_phase += left_inc;
127 if( left_phase >= TABLE_SIZE ) left_phase -= TABLE_SIZE;
128 right_phase += right_inc;
129 if( right_phase >= TABLE_SIZE ) right_phase -= TABLE_SIZE;
130 }
131
132 err = Pa_WriteStream( stream, buffer, FRAMES_PER_BUFFER );
133 if( err != paNoError ) goto error;
134 }
135
136 err = Pa_StopStream( stream );
137 if( err != paNoError ) goto error;
138
139 ++left_inc;
140 ++right_inc;
141
142 Pa_Sleep( 1000 );
143 }
144
145 err = Pa_CloseStream( stream );
146 if( err != paNoError ) goto error;
147
148 Pa_Terminate();
149 printf("Test finished.\n");
150
151 return err;
152
153error:
154 fprintf( stderr, "An error occurred while using the portaudio stream\n" );
155 fprintf( stderr, "Error number: %d\n", err );
156 fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
157 // Print more information about the error.
158 if( err == paUnanticipatedHostError )
159 {
160 const PaHostErrorInfo *hostErrorInfo = Pa_GetLastHostErrorInfo();
161 fprintf( stderr, "Host API error = #%ld, hostApiType = %d\n", hostErrorInfo->errorCode, hostErrorInfo->hostApiType );
162 fprintf( stderr, "Host API error = %s\n", hostErrorInfo->errorText );
163 }
164 Pa_Terminate();
165 return err;
166}
portaudio.h
The portable PortAudio API.
Pa_WriteStream
PaError Pa_WriteStream(PaStream *stream, const void *buffer, unsigned long frames)
Pa_Terminate
PaError Pa_Terminate(void)
PaStream
void PaStream
Definition: portaudio.h:635
Pa_Sleep
void Pa_Sleep(long msec)
Pa_GetLastHostErrorInfo
const PaHostErrorInfo * Pa_GetLastHostErrorInfo(void)
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
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_Initialize
PaError Pa_Initialize(void)
Pa_GetDefaultOutputDevice
PaDeviceIndex Pa_GetDefaultOutputDevice(void)
Pa_GetErrorText
const char * Pa_GetErrorText(PaError errorCode)
Pa_StopStream
PaError Pa_StopStream(PaStream *stream)
PaHostErrorInfo
Definition: portaudio.h:389
PaHostErrorInfo::errorCode
long errorCode
Definition: portaudio.h:391
PaHostErrorInfo::errorText
const char * errorText
Definition: portaudio.h:392
PaHostErrorInfo::hostApiType
PaHostApiTypeId hostApiType
Definition: portaudio.h:390
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