Chris@4: /** @file patest_longsine.c
Chris@4: @ingroup test_src
Chris@4: @brief Play a sine wave until ENTER hit.
Chris@4: @author Phil Burk http://www.softsynth.com
Chris@4: */
Chris@4: /*
Chris@4: * $Id: patest_longsine.c 1368 2008-03-01 00:38:27Z rossb $
Chris@4: *
Chris@4: * This program uses the PortAudio Portable Audio Library.
Chris@4: * For more information see: http://www.portaudio.com
Chris@4: * Copyright (c) 1999-2000 Ross Bencina and Phil Burk
Chris@4: *
Chris@4: * Permission is hereby granted, free of charge, to any person obtaining
Chris@4: * a copy of this software and associated documentation files
Chris@4: * (the "Software"), to deal in the Software without restriction,
Chris@4: * including without limitation the rights to use, copy, modify, merge,
Chris@4: * publish, distribute, sublicense, and/or sell copies of the Software,
Chris@4: * and to permit persons to whom the Software is furnished to do so,
Chris@4: * subject to the following conditions:
Chris@4: *
Chris@4: * The above copyright notice and this permission notice shall be
Chris@4: * included in all copies or substantial portions of the Software.
Chris@4: *
Chris@4: * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
Chris@4: * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
Chris@4: * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
Chris@4: * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
Chris@4: * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
Chris@4: * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
Chris@4: * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Chris@4: */
Chris@4:
Chris@4: /*
Chris@4: * The text above constitutes the entire PortAudio license; however,
Chris@4: * the PortAudio community also makes the following non-binding requests:
Chris@4: *
Chris@4: * Any person wishing to distribute modifications to the Software is
Chris@4: * requested to send the modifications to the original developer so that
Chris@4: * they can be incorporated into the canonical version. It is also
Chris@4: * requested that these non-binding requests be included along with the
Chris@4: * license above.
Chris@4: */
Chris@4:
Chris@4: #include <stdio.h>
Chris@4: #include <math.h>
Chris@4:
Chris@4: #include "portaudio.h"
Chris@4:
Chris@4: #define SAMPLE_RATE (44100)
Chris@4:
Chris@4: #ifndef M_PI
Chris@4: #define M_PI (3.14159265)
Chris@4: #endif
Chris@4:
Chris@4: #define TABLE_SIZE (200)
Chris@4: typedef struct
Chris@4: {
Chris@4: float sine[TABLE_SIZE];
Chris@4: int left_phase;
Chris@4: int right_phase;
Chris@4: }
Chris@4: paTestData;
Chris@4:
Chris@4: /* This routine will be called by the PortAudio engine when audio is needed.
Chris@4: ** It may called at interrupt level on some machines so don't do anything
Chris@4: ** that could mess up the system like calling malloc() or free().
Chris@4: */
Chris@4: static int patestCallback(const void* inputBuffer,
Chris@4: void* outputBuffer,
Chris@4: unsigned long framesPerBuffer,
Chris@4: const PaStreamCallbackTimeInfo* timeInfo,
Chris@4: PaStreamCallbackFlags statusFlags,
Chris@4: void* userData)
Chris@4: {
Chris@4: paTestData *data = (paTestData*)userData;
Chris@4: float *out = (float*)outputBuffer;
Chris@4: unsigned int i;
Chris@4: (void) inputBuffer; /* Prevent unused argument warning. */
Chris@4: for( i=0; i<framesPerBuffer; i++ )
Chris@4: {
Chris@4: *out++ = data->sine[data->left_phase]; /* left */
Chris@4: *out++ = data->sine[data->right_phase]; /* right */
Chris@4: data->left_phase += 1;
Chris@4: if( data->left_phase >= TABLE_SIZE ) data->left_phase -= TABLE_SIZE;
Chris@4: data->right_phase += 3; /* higher pitch so we can distinguish left and right. */
Chris@4: if( data->right_phase >= TABLE_SIZE ) data->right_phase -= TABLE_SIZE;
Chris@4: }
Chris@4: return 0;
Chris@4: }
Chris@4:
Chris@4: /*******************************************************************/
Chris@4: int main(void);
Chris@4: int main(void)
Chris@4: {
Chris@4: PaStreamParameters outputParameters;
Chris@4: PaStream *stream;
Chris@4: PaError err;
Chris@4: paTestData data;
Chris@4: int i;
Chris@4: printf("PortAudio Test: output sine wave.\n");
Chris@4:
Chris@4: /* initialise sinusoidal wavetable */
Chris@4: for( i=0; i<TABLE_SIZE; i++ )
Chris@4: {
Chris@4: data.sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. );
Chris@4: }
Chris@4: data.left_phase = data.right_phase = 0;
Chris@4:
Chris@4: err = Pa_Initialize();
Chris@4: if( err != paNoError ) goto error;
Chris@4:
Chris@4: outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */
Chris@4: if (outputParameters.device == paNoDevice) {
Chris@4: fprintf(stderr,"Error: No default output device.\n");
Chris@4: goto error;
Chris@4: }
Chris@4: outputParameters.channelCount = 2; /* stereo output */
Chris@4: outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */
Chris@4: outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;
Chris@4: outputParameters.hostApiSpecificStreamInfo = NULL;
Chris@4:
Chris@4: err = Pa_OpenStream( &stream,
Chris@4: NULL, /* No input. */
Chris@4: &outputParameters, /* As above. */
Chris@4: SAMPLE_RATE,
Chris@4: 256, /* Frames per buffer. */
Chris@4: paClipOff, /* No out of range samples expected. */
Chris@4: patestCallback,
Chris@4: &data );
Chris@4: if( err != paNoError ) goto error;
Chris@4:
Chris@4: err = Pa_StartStream( stream );
Chris@4: if( err != paNoError ) goto error;
Chris@4:
Chris@4: printf("Hit ENTER to stop program.\n");
Chris@4: getchar();
Chris@4:
Chris@4: err = Pa_CloseStream( stream );
Chris@4: if( err != paNoError ) goto error;
Chris@4: Pa_Terminate();
Chris@4:
Chris@4: printf("Test finished.\n");
Chris@4: return err;
Chris@4:
Chris@4: error:
Chris@4: Pa_Terminate();
Chris@4: fprintf( stderr, "An error occured while using the portaudio stream\n" );
Chris@4: fprintf( stderr, "Error number: %d\n", err );
Chris@4: fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
Chris@4: return err;
Chris@4: }