cannam@140: /** @file patest_write_stop.c
cannam@140: 	@brief Play a few seconds of silence followed by a few cycles of a sine wave. Tests to make sure that pa_StopStream() completes playback in blocking I/O
cannam@140: 	@author Bjorn Roche of XO Audio (www.xoaudio.com)
cannam@140: 	@author Ross Bencina
cannam@140: 	@author Phil Burk
cannam@140: */
cannam@140: /*
cannam@140:  * $Id$
cannam@140:  *
cannam@140:  * This program uses the PortAudio Portable Audio Library.
cannam@140:  * For more information see: http://www.portaudio.com/
cannam@140:  * Copyright (c) 1999-2000 Ross Bencina and Phil Burk
cannam@140:  *
cannam@140:  * Permission is hereby granted, free of charge, to any person obtaining
cannam@140:  * a copy of this software and associated documentation files
cannam@140:  * (the "Software"), to deal in the Software without restriction,
cannam@140:  * including without limitation the rights to use, copy, modify, merge,
cannam@140:  * publish, distribute, sublicense, and/or sell copies of the Software,
cannam@140:  * and to permit persons to whom the Software is furnished to do so,
cannam@140:  * subject to the following conditions:
cannam@140:  *
cannam@140:  * The above copyright notice and this permission notice shall be
cannam@140:  * included in all copies or substantial portions of the Software.
cannam@140:  *
cannam@140:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
cannam@140:  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
cannam@140:  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
cannam@140:  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
cannam@140:  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
cannam@140:  * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
cannam@140:  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
cannam@140:  */
cannam@140: 
cannam@140: /*
cannam@140:  * The text above constitutes the entire PortAudio license; however, 
cannam@140:  * the PortAudio community also makes the following non-binding requests:
cannam@140:  *
cannam@140:  * Any person wishing to distribute modifications to the Software is
cannam@140:  * requested to send the modifications to the original developer so that
cannam@140:  * they can be incorporated into the canonical version. It is also 
cannam@140:  * requested that these non-binding requests be included along with the 
cannam@140:  * license above.
cannam@140:  */
cannam@140: 
cannam@140: #include <stdio.h>
cannam@140: #include <math.h>
cannam@140: #include "portaudio.h"
cannam@140: 
cannam@140: #define NUM_SECONDS         (5)
cannam@140: #define SAMPLE_RATE         (44100)
cannam@140: #define FRAMES_PER_BUFFER   (1024)
cannam@140: 
cannam@140: #ifndef M_PI
cannam@140: #define M_PI  (3.14159265)
cannam@140: #endif
cannam@140: 
cannam@140: #define TABLE_SIZE   (200)
cannam@140: 
cannam@140: 
cannam@140: int main(void);
cannam@140: int main(void)
cannam@140: {
cannam@140:     PaStreamParameters outputParameters;
cannam@140:     PaStream *stream;
cannam@140:     PaError err;
cannam@140:     float buffer[FRAMES_PER_BUFFER][2]; /* stereo output buffer */
cannam@140:     float sine[TABLE_SIZE]; /* sine wavetable */
cannam@140:     int left_phase = 0;
cannam@140:     int right_phase = 0;
cannam@140:     int left_inc = 1;
cannam@140:     int right_inc = 3; /* higher pitch so we can distinguish left and right. */
cannam@140:     int i, j;
cannam@140:     int bufferCount;
cannam@140:     const int   framesBy2  = FRAMES_PER_BUFFER >> 1;
cannam@140:     const float framesBy2f = (float) framesBy2 ;
cannam@140: 
cannam@140:     
cannam@140:     printf( "PortAudio Test: output silence, followed by one buffer of a ramped sine wave. SR = %d, BufSize = %d\n",
cannam@140:             SAMPLE_RATE, FRAMES_PER_BUFFER);
cannam@140:     
cannam@140:     /* initialise sinusoidal wavetable */
cannam@140:     for( i=0; i<TABLE_SIZE; i++ )
cannam@140:     {
cannam@140:         sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. );
cannam@140:     }
cannam@140: 
cannam@140:     
cannam@140:     err = Pa_Initialize();
cannam@140:     if( err != paNoError ) goto error;
cannam@140: 
cannam@140:     outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */
cannam@140:     outputParameters.channelCount = 2;       /* stereo output */
cannam@140:     outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */
cannam@140:     outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultHighOutputLatency * 5;
cannam@140:     outputParameters.hostApiSpecificStreamInfo = NULL;
cannam@140: 
cannam@140:     /* open the stream */
cannam@140:     err = Pa_OpenStream(
cannam@140:               &stream,
cannam@140:               NULL, /* no input */
cannam@140:               &outputParameters,
cannam@140:               SAMPLE_RATE,
cannam@140:               FRAMES_PER_BUFFER,
cannam@140:               paClipOff,      /* we won't output out of range samples so don't bother clipping them */
cannam@140:               NULL, /* no callback, use blocking API */
cannam@140:               NULL ); /* no callback, so no callback userData */
cannam@140:     if( err != paNoError ) goto error;
cannam@140: 
cannam@140:     /* start the stream */
cannam@140:     err = Pa_StartStream( stream );
cannam@140:     if( err != paNoError ) goto error;
cannam@140: 
cannam@140:     printf("Playing %d seconds of silence followed by one buffer of a ramped sinusoid.\n", NUM_SECONDS );
cannam@140: 
cannam@140:     bufferCount = ((NUM_SECONDS * SAMPLE_RATE) / FRAMES_PER_BUFFER);
cannam@140: 
cannam@140:     /* clear buffer */
cannam@140:     for( j=0; j < FRAMES_PER_BUFFER; j++ )
cannam@140:     {
cannam@140:         buffer[j][0] = 0;  /* left */
cannam@140:         buffer[j][1] = 0;  /* right */
cannam@140:     }
cannam@140:     /* play the silent buffer a bunch o' times */
cannam@140:     for( i=0; i < bufferCount; i++ )
cannam@140:     {
cannam@140:         err = Pa_WriteStream( stream, buffer, FRAMES_PER_BUFFER );
cannam@140:         if( err != paNoError ) goto error;
cannam@140:     }   
cannam@140:     /* play a non-silent buffer once */
cannam@140:     for( j=0; j < FRAMES_PER_BUFFER; j++ )
cannam@140:     {
cannam@140:         float ramp = 1;
cannam@140:         if( j < framesBy2 )
cannam@140:            ramp = j / framesBy2f;
cannam@140:         else
cannam@140:            ramp = (FRAMES_PER_BUFFER - j) / framesBy2f ;
cannam@140: 
cannam@140:         buffer[j][0] = sine[left_phase] * ramp;  /* left */
cannam@140:         buffer[j][1] = sine[right_phase] * ramp;  /* right */
cannam@140:         left_phase += left_inc;
cannam@140:         if( left_phase >= TABLE_SIZE ) left_phase -= TABLE_SIZE;
cannam@140:         right_phase += right_inc;
cannam@140:         if( right_phase >= TABLE_SIZE ) right_phase -= TABLE_SIZE;
cannam@140:     }
cannam@140:     err = Pa_WriteStream( stream, buffer, FRAMES_PER_BUFFER );
cannam@140:     if( err != paNoError ) goto error;
cannam@140: 
cannam@140:     /* stop stream, close, and terminate */
cannam@140:     err = Pa_StopStream( stream );
cannam@140:     if( err != paNoError ) goto error;
cannam@140: 
cannam@140:     err = Pa_CloseStream( stream );
cannam@140:     if( err != paNoError ) goto error;
cannam@140: 
cannam@140:     Pa_Terminate();
cannam@140:     printf("Test finished.\n");
cannam@140:     
cannam@140:     return err;
cannam@140: error:
cannam@140:     Pa_Terminate();
cannam@140:     fprintf( stderr, "An error occured while using the portaudio stream\n" );
cannam@140:     fprintf( stderr, "Error number: %d\n", err );
cannam@140:     fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
cannam@140:     return err;
cannam@140: }