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git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/trunk@249 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
148 lines
4.9 KiB
C
148 lines
4.9 KiB
C
/** @file patest_write_sine.c
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@brief Play a sine wave for several seconds using the blocking API (Pa_WriteStream())
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@author Ross Bencina <rossb@audiomulch.com>
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@author Phil Burk <philburk@softsynth.com>
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*/
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/*
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* $Id$
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*
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* This program uses the PortAudio Portable Audio Library.
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* For more information see: http://www.portaudio.com/
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* Copyright (c) 1999-2000 Ross Bencina and Phil Burk
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* Any person wishing to distribute modifications to the Software is
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* requested to send the modifications to the original developer so that
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* they can be incorporated into the canonical version.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
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* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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*/
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#include <stdio.h>
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#include <math.h>
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#include "portaudio.h"
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#define NUM_SECONDS (5)
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#define SAMPLE_RATE (44100)
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#define FRAMES_PER_BUFFER (1024)
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#ifndef M_PI
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#define M_PI (3.14159265)
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#endif
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#define TABLE_SIZE (200)
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int main(void);
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int main(void)
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{
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PaStreamParameters outputParameters;
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PaStream *stream;
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PaError err;
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float buffer[FRAMES_PER_BUFFER][2]; /* stereo output buffer */
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float sine[TABLE_SIZE]; /* sine wavetable */
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int left_phase = 0;
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int right_phase = 0;
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int left_inc = 1;
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int right_inc = 3; /* higher pitch so we can distinguish left and right. */
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int i, j, k;
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int bufferCount;
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printf("PortAudio Test: output sine wave. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER);
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/* initialise sinusoidal wavetable */
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for( i=0; i<TABLE_SIZE; i++ )
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{
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sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. );
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}
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err = Pa_Initialize();
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if( err != paNoError ) goto error;
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outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */
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outputParameters.channelCount = 2; /* stereo output */
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outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */
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outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;
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outputParameters.hostApiSpecificStreamInfo = NULL;
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err = Pa_OpenStream(
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&stream,
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NULL, /* no input */
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&outputParameters,
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SAMPLE_RATE,
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FRAMES_PER_BUFFER,
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paClipOff, /* we won't output out of range samples so don't bother clipping them */
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NULL, /* no callback, use blocking API */
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NULL ); /* no callback, so no callback userData */
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if( err != paNoError ) goto error;
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printf( "Play 3 times, higher each time.\n" );
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for( k=0; k < 3; ++k )
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{
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err = Pa_StartStream( stream );
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if( err != paNoError ) goto error;
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printf("Play for %d seconds.\n", NUM_SECONDS );
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bufferCount = ((NUM_SECONDS * SAMPLE_RATE) / FRAMES_PER_BUFFER);
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for( i=0; i < bufferCount; i++ )
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{
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for( j=0; j < FRAMES_PER_BUFFER; j++ )
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{
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buffer[j][0] = sine[left_phase]; /* left */
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buffer[j][1] = sine[right_phase]; /* right */
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left_phase += left_inc;
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if( left_phase >= TABLE_SIZE ) left_phase -= TABLE_SIZE;
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right_phase += right_inc;
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if( right_phase >= TABLE_SIZE ) right_phase -= TABLE_SIZE;
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}
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err = Pa_WriteStream( stream, buffer, FRAMES_PER_BUFFER );
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if( err != paNoError ) goto error;
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}
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err = Pa_StopStream( stream );
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if( err != paNoError ) goto error;
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++left_inc;
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++right_inc;
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Pa_Sleep( 1000 );
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}
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err = Pa_CloseStream( stream );
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if( err != paNoError ) goto error;
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Pa_Terminate();
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printf("Test finished.\n");
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return err;
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error:
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Pa_Terminate();
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fprintf( stderr, "An error occured while using the portaudio stream\n" );
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fprintf( stderr, "Error number: %d\n", err );
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fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
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return err;
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}
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