Chris@4: /** @file paex_write_sine.c Chris@4: @ingroup examples_src Chris@4: @brief Play a sine wave for several seconds using the blocking API (Pa_WriteStream()) Chris@4: @author Ross Bencina Chris@4: @author Phil Burk Chris@4: */ Chris@4: /* Chris@4: * $Id: paex_write_sine.c 1752 2011-09-08 03:21:55Z philburk $ 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 Chris@4: #include Chris@4: #include "portaudio.h" Chris@4: Chris@4: #define NUM_SECONDS (5) Chris@4: #define SAMPLE_RATE (44100) Chris@4: #define FRAMES_PER_BUFFER (1024) 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: 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: float buffer[FRAMES_PER_BUFFER][2]; /* stereo output buffer */ Chris@4: float sine[TABLE_SIZE]; /* sine wavetable */ Chris@4: int left_phase = 0; Chris@4: int right_phase = 0; Chris@4: int left_inc = 1; Chris@4: int right_inc = 3; /* higher pitch so we can distinguish left and right. */ Chris@4: int i, j, k; Chris@4: int bufferCount; Chris@4: Chris@4: Chris@4: printf("PortAudio Test: output sine wave. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER); Chris@4: Chris@4: /* initialise sinusoidal wavetable */ Chris@4: for( i=0; idefaultLowOutputLatency; Chris@4: outputParameters.hostApiSpecificStreamInfo = NULL; Chris@4: Chris@4: err = Pa_OpenStream( Chris@4: &stream, Chris@4: NULL, /* no input */ Chris@4: &outputParameters, Chris@4: SAMPLE_RATE, Chris@4: FRAMES_PER_BUFFER, Chris@4: paClipOff, /* we won't output out of range samples so don't bother clipping them */ Chris@4: NULL, /* no callback, use blocking API */ Chris@4: NULL ); /* no callback, so no callback userData */ Chris@4: if( err != paNoError ) goto error; Chris@4: Chris@4: Chris@4: printf( "Play 3 times, higher each time.\n" ); Chris@4: Chris@4: for( k=0; k < 3; ++k ) Chris@4: { Chris@4: err = Pa_StartStream( stream ); Chris@4: if( err != paNoError ) goto error; Chris@4: Chris@4: printf("Play for %d seconds.\n", NUM_SECONDS ); Chris@4: Chris@4: bufferCount = ((NUM_SECONDS * SAMPLE_RATE) / FRAMES_PER_BUFFER); Chris@4: Chris@4: for( i=0; i < bufferCount; i++ ) Chris@4: { Chris@4: for( j=0; j < FRAMES_PER_BUFFER; j++ ) Chris@4: { Chris@4: buffer[j][0] = sine[left_phase]; /* left */ Chris@4: buffer[j][1] = sine[right_phase]; /* right */ Chris@4: left_phase += left_inc; Chris@4: if( left_phase >= TABLE_SIZE ) left_phase -= TABLE_SIZE; Chris@4: right_phase += right_inc; Chris@4: if( right_phase >= TABLE_SIZE ) right_phase -= TABLE_SIZE; Chris@4: } Chris@4: Chris@4: err = Pa_WriteStream( stream, buffer, FRAMES_PER_BUFFER ); Chris@4: if( err != paNoError ) goto error; Chris@4: } Chris@4: Chris@4: err = Pa_StopStream( stream ); Chris@4: if( err != paNoError ) goto error; Chris@4: Chris@4: ++left_inc; Chris@4: ++right_inc; Chris@4: Chris@4: Pa_Sleep( 1000 ); Chris@4: } Chris@4: Chris@4: err = Pa_CloseStream( stream ); Chris@4: if( err != paNoError ) goto error; Chris@4: Chris@4: Pa_Terminate(); Chris@4: printf("Test finished.\n"); Chris@4: Chris@4: return err; 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: }