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/*
* $Id: patest_sine_time.c,v 1.1.1.1 2003-05-09 16:03:56 ggeiger Exp $
* patest_sine_time.c
* Play a sine wave using the Portable Audio api for several seconds.
* Pausing in the middle.
* use the Pa_GetStreamTime() and Pa_IsStreamActive() calls.
*
* Authors:
* Ross Bencina <rossb@audiomulch.com>
* Phil Burk <philburk@softsynth.com>
*
* This program uses the PortAudio Portable Audio Library.
* For more information see: http://www.audiomulch.com/portaudio/
* 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.
*
* 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.
*
* 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.
*
*/
#include <stdio.h>
#include <math.h>
#include "portaudio.h"
#include "pa_util.h"
#define NUM_SECONDS (8)
#define SAMPLE_RATE (44100)
#define FRAMES_PER_BUFFER (64)
#define NUM_BUFFERS (0)
#ifndef M_PI
#define M_PI (3.14159265)
#endif
#define TWOPI (M_PI * 2.0)
#define TABLE_SIZE (200)
typedef struct
{
double left_phase;
double right_phase;
volatile PaTimestamp outTime;
}
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( void *inputBuffer, void *outputBuffer,
unsigned long framesPerBuffer,
PaTimestamp outTime, void *userData )
{
paTestData *data = (paTestData*)userData;
float *out = (float*)outputBuffer;
unsigned int i;
double left_phaseInc = 0.02;
double right_phaseInc = 0.06;
double left_phase = data->left_phase;
double right_phase = data->right_phase;
(void) outTime; /* Prevent unused variable warnings. */
(void) inputBuffer;
data->outTime = outTime;\
for( i=0; i<framesPerBuffer; i++ )
{
left_phase += left_phaseInc;
if( left_phase > TWOPI ) left_phase -= TWOPI;
*out++ = (float) sin( left_phase );
right_phase += right_phaseInc;
if( right_phase > TWOPI ) right_phase -= TWOPI;
*out++ = (float) sin( right_phase );
}
data->left_phase = left_phase;
data->right_phase = right_phase;
return paContinue;
}
/*******************************************************************/
static void ReportStreamTime( PaStream *stream, paTestData *data );
static void ReportStreamTime( PaStream *stream, paTestData *data )
{
PaTimestamp streamTime, latency, outTime;
streamTime = Pa_GetStreamTime( stream );
outTime = data->outTime;
if( outTime < 0.0 )
{
printf("Stream time = %8.1f\n", streamTime );
}
else
{
latency = outTime - streamTime;
printf("Stream time = %8.1f, outTime = %8.1f, latency = %8.1f\n",
streamTime, outTime, latency );
}
fflush(stdout);
}
/*******************************************************************/
int main(void);
int main(void)
{
PaStream *stream;
PaError err;
paTestData DATA;
int totalSamps;
printf("PortAudio Test: output sine wave. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER);
DATA.left_phase = DATA.right_phase = 0;
totalSamps = NUM_SECONDS * SAMPLE_RATE; /* Play for a few seconds. */
err = Pa_Initialize();
if( err != paNoError ) goto error;
err = Pa_OpenStream(
&stream,
paNoDevice,/* default input device */
0, /* no input */
paFloat32, /* 32 bit floating point input */
0, /* default latency */
NULL,
Pa_GetDefaultOutputDevice(), /* default output device */
2, /* stereo output */
paFloat32, /* 32 bit floating point output */
0, /* default latency */
NULL,
SAMPLE_RATE,
FRAMES_PER_BUFFER, /* frames per buffer */
paClipOff, /* we won't output out of range samples so don't bother clipping them */
patestCallback,
&DATA );
if( err != paNoError ) goto error;
/* Watch until sound is halfway finished. */
printf("Play for %d seconds.\n", NUM_SECONDS/2 ); fflush(stdout);
DATA.outTime = -1.0; // mark time for callback as undefined
err = Pa_StartStream( stream );
if( err != paNoError ) goto error;
do
{
ReportStreamTime( stream, &DATA );
Pa_Sleep(100);
} while( Pa_GetStreamTime( stream ) < (totalSamps/2) );
/* Stop sound until ENTER hit. */
err = Pa_StopStream( stream );
if( err != paNoError ) goto error;
printf("Pause for 2 seconds.\n"); fflush(stdout);
Pa_Sleep( 2000 );
DATA.outTime = -1.0; // mark time for callback as undefined
err = Pa_StartStream( stream );
if( err != paNoError ) goto error;
printf("Play until sound is finished.\n"); fflush(stdout);
do
{
ReportStreamTime( stream, &DATA );
Pa_Sleep(100);
} while( Pa_GetStreamTime( stream ) < (totalSamps/2) );
err = Pa_CloseStream( stream );
if( err != paNoError ) goto error;
Pa_Terminate();
printf("Test finished.\n");
return err;
error:
Pa_Terminate();
fprintf( stderr, "An error occured 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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