cannam@124: /** @file paex_write_sine.c
cannam@124: 	@ingroup examples_src
cannam@124: 	@brief Play a sine wave for several seconds using the blocking API (Pa_WriteStream())
cannam@124: 	@author Ross Bencina <rossb@audiomulch.com>
cannam@124:     @author Phil Burk <philburk@softsynth.com>
cannam@124: */
cannam@124: /*
cannam@124:  * $Id: paex_write_sine.c 1865 2012-09-01 21:16:25Z philburk $
cannam@124:  *
cannam@124:  * This program uses the PortAudio Portable Audio Library.
cannam@124:  * For more information see: http://www.portaudio.com/
cannam@124:  * Copyright (c) 1999-2000 Ross Bencina and Phil Burk
cannam@124:  *
cannam@124:  * Permission is hereby granted, free of charge, to any person obtaining
cannam@124:  * a copy of this software and associated documentation files
cannam@124:  * (the "Software"), to deal in the Software without restriction,
cannam@124:  * including without limitation the rights to use, copy, modify, merge,
cannam@124:  * publish, distribute, sublicense, and/or sell copies of the Software,
cannam@124:  * and to permit persons to whom the Software is furnished to do so,
cannam@124:  * subject to the following conditions:
cannam@124:  *
cannam@124:  * The above copyright notice and this permission notice shall be
cannam@124:  * included in all copies or substantial portions of the Software.
cannam@124:  *
cannam@124:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
cannam@124:  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
cannam@124:  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
cannam@124:  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
cannam@124:  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
cannam@124:  * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
cannam@124:  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
cannam@124:  */
cannam@124: 
cannam@124: /*
cannam@124:  * The text above constitutes the entire PortAudio license; however, 
cannam@124:  * the PortAudio community also makes the following non-binding requests:
cannam@124:  *
cannam@124:  * Any person wishing to distribute modifications to the Software is
cannam@124:  * requested to send the modifications to the original developer so that
cannam@124:  * they can be incorporated into the canonical version. It is also 
cannam@124:  * requested that these non-binding requests be included along with the 
cannam@124:  * license above.
cannam@124:  */
cannam@124: 
cannam@124: #include <stdio.h>
cannam@124: #include <math.h>
cannam@124: #include "portaudio.h"
cannam@124: 
cannam@124: #define NUM_SECONDS         (5)
cannam@124: #define SAMPLE_RATE         (44100)
cannam@124: #define FRAMES_PER_BUFFER   (1024)
cannam@124: 
cannam@124: #ifndef M_PI
cannam@124: #define M_PI  (3.14159265)
cannam@124: #endif
cannam@124: 
cannam@124: #define TABLE_SIZE   (200)
cannam@124: 
cannam@124: 
cannam@124: int main(void);
cannam@124: int main(void)
cannam@124: {
cannam@124:     PaStreamParameters outputParameters;
cannam@124:     PaStream *stream;
cannam@124:     PaError err;
cannam@124:     float buffer[FRAMES_PER_BUFFER][2]; /* stereo output buffer */
cannam@124:     float sine[TABLE_SIZE]; /* sine wavetable */
cannam@124:     int left_phase = 0;
cannam@124:     int right_phase = 0;
cannam@124:     int left_inc = 1;
cannam@124:     int right_inc = 3; /* higher pitch so we can distinguish left and right. */
cannam@124:     int i, j, k;
cannam@124:     int bufferCount;
cannam@124:     
cannam@124:     printf("PortAudio Test: output sine wave. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER);
cannam@124:     
cannam@124:     /* initialise sinusoidal wavetable */
cannam@124:     for( i=0; i<TABLE_SIZE; i++ )
cannam@124:     {
cannam@124:         sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. );
cannam@124:     }
cannam@124: 
cannam@124:     
cannam@124:     err = Pa_Initialize();
cannam@124:     if( err != paNoError ) goto error;
cannam@124: 
cannam@124:     outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */
cannam@124:     if (outputParameters.device == paNoDevice) {
cannam@124:       fprintf(stderr,"Error: No default output device.\n");
cannam@124:       goto error;
cannam@124:     }
cannam@124:     outputParameters.channelCount = 2;       /* stereo output */
cannam@124:     outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */
cannam@124:     outputParameters.suggestedLatency = 0.050; // Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;
cannam@124:     outputParameters.hostApiSpecificStreamInfo = NULL;
cannam@124: 
cannam@124:     err = Pa_OpenStream(
cannam@124:               &stream,
cannam@124:               NULL, /* no input */
cannam@124:               &outputParameters,
cannam@124:               SAMPLE_RATE,
cannam@124:               FRAMES_PER_BUFFER,
cannam@124:               paClipOff,      /* we won't output out of range samples so don't bother clipping them */
cannam@124:               NULL, /* no callback, use blocking API */
cannam@124:               NULL ); /* no callback, so no callback userData */
cannam@124:     if( err != paNoError ) goto error;
cannam@124: 
cannam@124: 
cannam@124:     printf( "Play 3 times, higher each time.\n" );
cannam@124:     
cannam@124:     for( k=0; k < 3; ++k )
cannam@124:     {
cannam@124:         err = Pa_StartStream( stream );
cannam@124:         if( err != paNoError ) goto error;
cannam@124: 
cannam@124:         printf("Play for %d seconds.\n", NUM_SECONDS );
cannam@124: 
cannam@124:         bufferCount = ((NUM_SECONDS * SAMPLE_RATE) / FRAMES_PER_BUFFER);
cannam@124: 
cannam@124:         for( i=0; i < bufferCount; i++ )
cannam@124:         {
cannam@124:             for( j=0; j < FRAMES_PER_BUFFER; j++ )
cannam@124:             {
cannam@124:                 buffer[j][0] = sine[left_phase];  /* left */
cannam@124:                 buffer[j][1] = sine[right_phase];  /* right */
cannam@124:                 left_phase += left_inc;
cannam@124:                 if( left_phase >= TABLE_SIZE ) left_phase -= TABLE_SIZE;
cannam@124:                 right_phase += right_inc;
cannam@124:                 if( right_phase >= TABLE_SIZE ) right_phase -= TABLE_SIZE;
cannam@124:             }
cannam@124: 
cannam@124:             err = Pa_WriteStream( stream, buffer, FRAMES_PER_BUFFER );
cannam@124:             if( err != paNoError ) goto error;
cannam@124:         }   
cannam@124: 
cannam@124:         err = Pa_StopStream( stream );
cannam@124:         if( err != paNoError ) goto error;
cannam@124: 
cannam@124:         ++left_inc;
cannam@124:         ++right_inc;
cannam@124: 
cannam@124:         Pa_Sleep( 1000 );
cannam@124:     }
cannam@124: 
cannam@124:     err = Pa_CloseStream( stream );
cannam@124:     if( err != paNoError ) goto error;
cannam@124: 
cannam@124:     Pa_Terminate();
cannam@124:     printf("Test finished.\n");
cannam@124:     
cannam@124:     return err;
cannam@124: 
cannam@124: error:
cannam@124:     fprintf( stderr, "An error occured while using the portaudio stream\n" );
cannam@124:     fprintf( stderr, "Error number: %d\n", err );
cannam@124:     fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
cannam@124: 	// Print more information about the error.
cannam@124: 	if( err == paUnanticipatedHostError )
cannam@124: 	{
cannam@124: 		const PaHostErrorInfo *hostErrorInfo = Pa_GetLastHostErrorInfo();
cannam@124: 		fprintf( stderr, "Host API error = #%ld, hostApiType = %d\n", hostErrorInfo->errorCode, hostErrorInfo->hostApiType );
cannam@124: 		fprintf( stderr, "Host API error = %s\n", hostErrorInfo->errorText );
cannam@124: 	}
cannam@124:     Pa_Terminate();
cannam@124:     return err;
cannam@124: }