/* * $Id: patest_mono.c,v 1.1.2.3 2003/04/10 23:09:40 philburk Exp $ * patest_sine.c * Play a monophonic sine wave using the Portable Audio api for several seconds. * * Authors: * Ross Bencina * 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 #include #include "portaudio.h" #define NUM_SECONDS (10) #define SAMPLE_RATE (44100) #define AMPLITUDE (0.8) #define FRAMES_PER_BUFFER (64) #define OUTPUT_DEVICE Pa_GetDefaultOutputDeviceID() #ifndef M_PI #define M_PI (3.14159265) #endif #define TABLE_SIZE (200) typedef struct { float sine[TABLE_SIZE]; int phase; } 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; float *out = (float*)outputBuffer; unsigned long i; int finished = 0; (void) outTime; /* Prevent unused variable warnings. */ (void) inputBuffer; for( i=0; isine[data->phase]; /* left */ data->phase += 1; if( data->phase >= TABLE_SIZE ) data->phase -= TABLE_SIZE; } return finished; } /*******************************************************************/ int main(void); int main(void) { PortAudioStream *stream; PaError err; paTestData data; int i; printf("PortAudio Test: output MONO sine wave. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER); /* initialise sinusoidal wavetable */ for( i=0; i