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/** @file patest_write_stop.c
@brief Play a few seconds of silence followed by a few cycles of a sine wave. Tests to make sure that pa_StopStream() completes playback in blocking I/O
@author Bjorn Roche of XO Audio (www.xoaudio.com)
@author Ross Bencina
@author Phil Burk
*/
/*
* $Id$
*
* 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 NUM_SECONDS (5)
#define SAMPLE_RATE (44100)
#define FRAMES_PER_BUFFER (1024)
#ifndef M_PI
#define M_PI (3.14159265)
#endif
#define TABLE_SIZE (200)
int main(void);
int main(void)
{
PaStreamParameters outputParameters;
PaStream *stream;
PaError err;
float buffer[FRAMES_PER_BUFFER][2]; /* stereo output buffer */
float sine[TABLE_SIZE]; /* sine wavetable */
int left_phase = 0;
int right_phase = 0;
int left_inc = 1;
int right_inc = 3; /* higher pitch so we can distinguish left and right. */
int i, j;
int bufferCount;
const int framesBy2 = FRAMES_PER_BUFFER >> 1;
const float framesBy2f = (float) framesBy2 ;
printf( "PortAudio Test: output silence, followed by one buffer of a ramped sine wave. SR = %d, BufSize = %d\n",
SAMPLE_RATE, FRAMES_PER_BUFFER);
/* initialise sinusoidal wavetable */
for( i=0; i<TABLE_SIZE; i++ )
{
sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. );
}
err = Pa_Initialize();
if( err != paNoError ) goto error;
outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */
outputParameters.channelCount = 2; /* stereo output */
outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */
outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultHighOutputLatency * 5;
outputParameters.hostApiSpecificStreamInfo = NULL;
/* open the stream */
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 */
NULL, /* no callback, use blocking API */
NULL ); /* no callback, so no callback userData */
if( err != paNoError ) goto error;
/* start the stream */
err = Pa_StartStream( stream );
if( err != paNoError ) goto error;
printf("Playing %d seconds of silence followed by one buffer of a ramped sinusoid.\n", NUM_SECONDS );
bufferCount = ((NUM_SECONDS * SAMPLE_RATE) / FRAMES_PER_BUFFER);
/* clear buffer */
for( j=0; j < FRAMES_PER_BUFFER; j++ )
{
buffer[j][0] = 0; /* left */
buffer[j][1] = 0; /* right */
}
/* play the silent buffer a bunch o' times */
for( i=0; i < bufferCount; i++ )
{
err = Pa_WriteStream( stream, buffer, FRAMES_PER_BUFFER );
if( err != paNoError ) goto error;
}
/* play a non-silent buffer once */
for( j=0; j < FRAMES_PER_BUFFER; j++ )
{
float ramp = 1;
if( j < framesBy2 )
ramp = j / framesBy2f;
else
ramp = (FRAMES_PER_BUFFER - j) / framesBy2f ;
buffer[j][0] = sine[left_phase] * ramp; /* left */
buffer[j][1] = sine[right_phase] * ramp; /* right */
left_phase += left_inc;
if( left_phase >= TABLE_SIZE ) left_phase -= TABLE_SIZE;
right_phase += right_inc;
if( right_phase >= TABLE_SIZE ) right_phase -= TABLE_SIZE;
}
err = Pa_WriteStream( stream, buffer, FRAMES_PER_BUFFER );
if( err != paNoError ) goto error;
/* stop stream, close, and terminate */
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 occurred while using the portaudio stream\n" );
fprintf( stderr, "Error number: %d\n", err );
fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
return err;
}
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