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/*
* $Id: debug_sine_formats.c,v 1.1 2002/03/21 00:44:35 philburk Exp $
* patest_sine_formats.c
* Play a sine wave using the Portable Audio api for several seconds.
* Test various data formats.
*
* Author: Phil Burk
*
* 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 (10)
#define SAMPLE_RATE (44100)
#define FRAMES_PER_BUFFER (256)
#define LEFT_FREQ (SAMPLE_RATE/512.0) /* So we hit 1.0 */
#define RIGHT_FREQ (500.0)
#define AMPLITUDE (1.0)
/* Select ONE format for testing. */
#define TEST_UINT8 (1)
#define TEST_INT8 (0)
#define TEST_INT16 (0)
#define TEST_FLOAT32 (0)
#if TEST_UINT8
#define TEST_FORMAT paUInt8
typedef unsigned char SAMPLE_t;
#define SAMPLE_ZERO (0x80)
#define DOUBLE_TO_SAMPLE(x) (SAMPLE_ZERO + (SAMPLE_t)(127.0 * (x)))
#define FORMAT_NAME "Unsigned 8 Bit"
#elif TEST_INT8
#define TEST_FORMAT paInt8
typedef char SAMPLE_t;
#define SAMPLE_ZERO (0)
#define DOUBLE_TO_SAMPLE(x) (SAMPLE_ZERO + (SAMPLE_t)(127.0 * (x)))
#define FORMAT_NAME "Signed 8 Bit"
#elif TEST_INT16
#define TEST_FORMAT paInt16
typedef short SAMPLE_t;
#define SAMPLE_ZERO (0)
#define DOUBLE_TO_SAMPLE(x) (SAMPLE_ZERO + (SAMPLE_t)(32767 * (x)))
#define FORMAT_NAME "Signed 16 Bit"
#elif TEST_FLOAT32
#define TEST_FORMAT paFloat32
typedef float SAMPLE_t;
#define SAMPLE_ZERO (0.0)
#define DOUBLE_TO_SAMPLE(x) ((SAMPLE_t)(x))
#define FORMAT_NAME "Float 32 Bit"
#endif
#ifndef M_PI
#define M_PI (3.14159265)
#endif
typedef struct
{
double left_phase;
double 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;
SAMPLE_t *out = (SAMPLE_t *)outputBuffer;
SAMPLE_t sample;
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++ )
{
data->left_phase += (LEFT_FREQ / SAMPLE_RATE);
if( data->left_phase > 1.0) data->left_phase -= 1.0;
sample = DOUBLE_TO_SAMPLE( AMPLITUDE * sin( (data->left_phase * M_PI * 2. ))); /**/
*out++ = sample;
/* *out++ = sample; /**/
/* *out++ = 0; /**/
data->right_phase += (RIGHT_FREQ / SAMPLE_RATE);
if( data->right_phase > 1.0) data->right_phase -= 1.0;
*out++ = DOUBLE_TO_SAMPLE( AMPLITUDE * sin( (data->right_phase * M_PI * 2. ))); /**/
/* *out++ = 0; /* */
}
/* zero remainder of final buffer */
for( ; i<(int)framesPerBuffer; i++ )
{
*out++ = SAMPLE_ZERO; /* left */
*out++ = SAMPLE_ZERO; /* right */
}
return finished;
}
/*******************************************************************/
int main(void);
int main(void)
{
PortAudioStream *stream;
PaError err;
paTestData data;
int totalSamps;
printf("PortAudio Test: output " FORMAT_NAME "\n");
data.left_phase = data.right_phase = 0.0;
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,
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;
printf("Waiting %d seconds for sound to finish.\n", NUM_SECONDS );
while( Pa_StreamActive( stream ) ) Pa_Sleep(10);
err = Pa_CloseStream( stream );
if( err != paNoError ) goto error;
Pa_Terminate();
printf("PortAudio Test Finished: " FORMAT_NAME "\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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