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/** @file patest_prime.c
@ingroup test_src
@brief Test stream priming mode.
@author Ross Bencina http://www.audiomulch.com/~rossb
*/
/*
* $Id$
*
* 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"
#include "pa_util.h"
#define NUM_BEEPS (3)
#define SAMPLE_RATE (44100)
#define SAMPLE_PERIOD (1.0/44100.0)
#define FRAMES_PER_BUFFER (256)
#define BEEP_DURATION (400)
#define IDLE_DURATION (SAMPLE_RATE*2) /* 2 seconds */
#define SLEEP_MSEC (50)
#define STATE_BKG_IDLE (0)
#define STATE_BKG_BEEPING (1)
typedef struct
{
float leftPhase;
float rightPhase;
int state;
int beepCountdown;
int idleCountdown;
}
paTestData;
static void InitializeTestData( paTestData *testData )
{
testData->leftPhase = 0;
testData->rightPhase = 0;
testData->state = STATE_BKG_BEEPING;
testData->beepCountdown = BEEP_DURATION;
testData->idleCountdown = IDLE_DURATION;
}
/* 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 )
{
/* Cast data passed through stream to our structure. */
paTestData *data = (paTestData*)userData;
float *out = (float*)outputBuffer;
unsigned int i;
int result = paContinue;
/* suppress unused parameter warnings */
(void) inputBuffer;
(void) timeInfo;
(void) statusFlags;
for( i=0; i<framesPerBuffer; i++ )
{
switch( data->state )
{
case STATE_BKG_IDLE:
*out++ = 0.0; /* left */
*out++ = 0.0; /* right */
--data->idleCountdown;
if( data->idleCountdown <= 0 ) result = paComplete;
break;
case STATE_BKG_BEEPING:
if( data->beepCountdown <= 0 )
{
data->state = STATE_BKG_IDLE;
*out++ = 0.0; /* left */
*out++ = 0.0; /* right */
}
else
{
/* Play sawtooth wave. */
*out++ = data->leftPhase; /* left */
*out++ = data->rightPhase; /* right */
/* Generate simple sawtooth phaser that ranges between -1.0 and 1.0. */
data->leftPhase += 0.01f;
/* When signal reaches top, drop back down. */
if( data->leftPhase >= 1.0f ) data->leftPhase -= 2.0f;
/* higher pitch so we can distinguish left and right. */
data->rightPhase += 0.03f;
if( data->rightPhase >= 1.0f ) data->rightPhase -= 2.0f;
}
--data->beepCountdown;
break;
}
}
return result;
}
/*******************************************************************/
static PaError DoTest( int flags )
{
PaStream *stream;
PaError err = paNoError;
paTestData data;
PaStreamParameters outputParameters;
InitializeTestData( &data );
outputParameters.device = Pa_GetDefaultOutputDevice();
if (outputParameters.device == paNoDevice) {
fprintf(stderr,"Error: No default output device.\n");
goto error;
}
outputParameters.channelCount = 2;
outputParameters.hostApiSpecificStreamInfo = NULL;
outputParameters.sampleFormat = paFloat32;
outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultHighOutputLatency;
/* Open an audio I/O stream. */
err = Pa_OpenStream(
&stream,
NULL, /* no input */
&outputParameters,
SAMPLE_RATE,
FRAMES_PER_BUFFER, /* frames per buffer */
paClipOff | flags, /* 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("hear \"BEEP\"\n" );
fflush(stdout);
while( ( err = Pa_IsStreamActive( stream ) ) == 1 ) Pa_Sleep(SLEEP_MSEC);
if( err < 0 ) goto error;
err = Pa_StopStream( stream );
if( err != paNoError ) goto error;
err = Pa_CloseStream( stream );
if( err != paNoError ) goto error;
return err;
error:
return err;
}
/*******************************************************************/
int main(void);
int main(void)
{
PaError err = paNoError;
int i;
/* Initialize library before making any other calls. */
err = Pa_Initialize();
if( err != paNoError ) goto error;
printf("PortAudio Test: Testing stream playback with no priming.\n");
printf("PortAudio Test: you should see BEEP before you hear it.\n");
printf("BEEP %d times.\n", NUM_BEEPS );
for( i=0; i< NUM_BEEPS; ++i )
{
err = DoTest( 0 );
if( err != paNoError )
goto error;
}
printf("PortAudio Test: Testing stream playback with priming.\n");
printf("PortAudio Test: you should see BEEP around the same time you hear it.\n");
for( i=0; i< NUM_BEEPS; ++i )
{
err = DoTest( paPrimeOutputBuffersUsingStreamCallback );
if( err != paNoError )
goto error;
}
printf("Test finished.\n");
Pa_Terminate();
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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