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/*
* $Id: patest_sine8.c,v 1.1.1.1 2003-05-09 16:03:56 ggeiger Exp $
* patest_sine8.c
* Play a sine wave using the Portable Audio api for several seconds.
* Test 8 bit data.
*
* Author: Ross Bencina <rossb@audiomulch.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"
#define NUM_SECONDS (8)
#define SAMPLE_RATE (44100)
#define TEST_UNSIGNED (1)
#if TEST_UNSIGNED
#define TEST_FORMAT paUInt8
#else
#define TEST_FORMAT paInt8
#endif
#ifndef M_PI
#define M_PI (3.14159265)
#endif
#define TABLE_SIZE (200)
typedef struct
{
#if TEST_UNSIGNED
unsigned char sine[TABLE_SIZE];
#else
char sine[TABLE_SIZE];
#endif
int left_phase;
int right_phase;
unsigned int framesToGo;
}
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;
char *out = (char*)outputBuffer;
int i;
int framesToCalc;
int finished = 0;
(void) outTime; /* Prevent unused variable warnings. */
(void) inputBuffer;
if( data->framesToGo < framesPerBuffer )
{
framesToCalc = data->framesToGo;
data->framesToGo = 0;
finished = 1;
}
else
{
framesToCalc = framesPerBuffer;
data->framesToGo -= framesPerBuffer;
}
for( i=0; i<framesToCalc; i++ )
{
*out++ = data->sine[data->left_phase]; /* left */
*out++ = data->sine[data->right_phase]; /* right */
data->left_phase += 1;
if( data->left_phase >= TABLE_SIZE ) data->left_phase -= TABLE_SIZE;
data->right_phase += 3; /* higher pitch so we can distinguish left and right. */
if( data->right_phase >= TABLE_SIZE ) data->right_phase -= TABLE_SIZE;
}
/* zero remainder of final buffer */
for( ; i<(int)framesPerBuffer; i++ )
{
#if TEST_UNSIGNED
*out++ = (unsigned char) 0x80; /* left */
*out++ = (unsigned char) 0x80; /* right */
#else
*out++ = 0; /* left */
*out++ = 0; /* right */
#endif
}
return finished;
}
/*******************************************************************/
int main(void);
int main(void)
{
PortAudioStream *stream;
PaError err;
paTestData data;
int i;
int totalSamps;
#if TEST_UNSIGNED
printf("PortAudio Test: output UNsigned 8 bit sine wave.\n");
#else
printf("PortAudio Test: output signed 8 bit sine wave.\n");
#endif
/* initialise sinusoidal wavetable */
for( i=0; i<TABLE_SIZE; i++ )
{
data.sine[i] = (char) (127.0 * sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. ));
#if TEST_UNSIGNED
data.sine[i] += (unsigned char) 0x80;
#endif
}
data.left_phase = data.right_phase = 0;
data.framesToGo = 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 */
TEST_FORMAT,
NULL,
Pa_GetDefaultOutputDeviceID(), /* default output device */
2, /* stereo output */
TEST_FORMAT,
NULL,
SAMPLE_RATE,
256, /* frames per buffer */
0, /* number of buffers, if zero then use default minimum */
paClipOff, /* 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;
/* Watch until sound is halfway finished. */
while( Pa_StreamTime( stream ) < (totalSamps/2) ) Pa_Sleep(10);
/* Stop sound until ENTER hit. */
err = Pa_StopStream( stream );
if( err != paNoError ) goto error;
printf("Pause for 2 seconds.\n");
Pa_Sleep( 2000 );
err = Pa_StartStream( stream );
if( err != paNoError ) goto error;
printf("Waiting for sound to finish.\n");
while( Pa_StreamActive( stream ) ) Pa_Sleep(10);
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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