Chris@39: /** @file paex_write_sine.c Chris@39: @ingroup examples_src Chris@39: @brief Play a sine wave for several seconds using the blocking API (Pa_WriteStream()) Chris@39: @author Ross Bencina Chris@39: @author Phil Burk Chris@39: */ Chris@39: /* Chris@39: * $Id: paex_write_sine.c 1865 2012-09-01 21:16:25Z philburk $ Chris@39: * Chris@39: * This program uses the PortAudio Portable Audio Library. Chris@39: * For more information see: http://www.portaudio.com/ Chris@39: * Copyright (c) 1999-2000 Ross Bencina and Phil Burk Chris@39: * Chris@39: * Permission is hereby granted, free of charge, to any person obtaining Chris@39: * a copy of this software and associated documentation files Chris@39: * (the "Software"), to deal in the Software without restriction, Chris@39: * including without limitation the rights to use, copy, modify, merge, Chris@39: * publish, distribute, sublicense, and/or sell copies of the Software, Chris@39: * and to permit persons to whom the Software is furnished to do so, Chris@39: * subject to the following conditions: Chris@39: * Chris@39: * The above copyright notice and this permission notice shall be Chris@39: * included in all copies or substantial portions of the Software. Chris@39: * Chris@39: * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, Chris@39: * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF Chris@39: * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. Chris@39: * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR Chris@39: * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF Chris@39: * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION Chris@39: * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Chris@39: */ Chris@39: Chris@39: /* Chris@39: * The text above constitutes the entire PortAudio license; however, Chris@39: * the PortAudio community also makes the following non-binding requests: Chris@39: * Chris@39: * Any person wishing to distribute modifications to the Software is Chris@39: * requested to send the modifications to the original developer so that Chris@39: * they can be incorporated into the canonical version. It is also Chris@39: * requested that these non-binding requests be included along with the Chris@39: * license above. Chris@39: */ Chris@39: Chris@39: #include Chris@39: #include Chris@39: #include "portaudio.h" Chris@39: Chris@39: #define NUM_SECONDS (5) Chris@39: #define SAMPLE_RATE (44100) Chris@39: #define FRAMES_PER_BUFFER (1024) Chris@39: Chris@39: #ifndef M_PI Chris@39: #define M_PI (3.14159265) Chris@39: #endif Chris@39: Chris@39: #define TABLE_SIZE (200) Chris@39: Chris@39: Chris@39: int main(void); Chris@39: int main(void) Chris@39: { Chris@39: PaStreamParameters outputParameters; Chris@39: PaStream *stream; Chris@39: PaError err; Chris@39: float buffer[FRAMES_PER_BUFFER][2]; /* stereo output buffer */ Chris@39: float sine[TABLE_SIZE]; /* sine wavetable */ Chris@39: int left_phase = 0; Chris@39: int right_phase = 0; Chris@39: int left_inc = 1; Chris@39: int right_inc = 3; /* higher pitch so we can distinguish left and right. */ Chris@39: int i, j, k; Chris@39: int bufferCount; Chris@39: Chris@39: printf("PortAudio Test: output sine wave. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER); Chris@39: Chris@39: /* initialise sinusoidal wavetable */ Chris@39: for( i=0; idefaultLowOutputLatency; Chris@39: outputParameters.hostApiSpecificStreamInfo = NULL; Chris@39: Chris@39: err = Pa_OpenStream( Chris@39: &stream, Chris@39: NULL, /* no input */ Chris@39: &outputParameters, Chris@39: SAMPLE_RATE, Chris@39: FRAMES_PER_BUFFER, Chris@39: paClipOff, /* we won't output out of range samples so don't bother clipping them */ Chris@39: NULL, /* no callback, use blocking API */ Chris@39: NULL ); /* no callback, so no callback userData */ Chris@39: if( err != paNoError ) goto error; Chris@39: Chris@39: Chris@39: printf( "Play 3 times, higher each time.\n" ); Chris@39: Chris@39: for( k=0; k < 3; ++k ) Chris@39: { Chris@39: err = Pa_StartStream( stream ); Chris@39: if( err != paNoError ) goto error; Chris@39: Chris@39: printf("Play for %d seconds.\n", NUM_SECONDS ); Chris@39: Chris@39: bufferCount = ((NUM_SECONDS * SAMPLE_RATE) / FRAMES_PER_BUFFER); Chris@39: Chris@39: for( i=0; i < bufferCount; i++ ) Chris@39: { Chris@39: for( j=0; j < FRAMES_PER_BUFFER; j++ ) Chris@39: { Chris@39: buffer[j][0] = sine[left_phase]; /* left */ Chris@39: buffer[j][1] = sine[right_phase]; /* right */ Chris@39: left_phase += left_inc; Chris@39: if( left_phase >= TABLE_SIZE ) left_phase -= TABLE_SIZE; Chris@39: right_phase += right_inc; Chris@39: if( right_phase >= TABLE_SIZE ) right_phase -= TABLE_SIZE; Chris@39: } Chris@39: Chris@39: err = Pa_WriteStream( stream, buffer, FRAMES_PER_BUFFER ); Chris@39: if( err != paNoError ) goto error; Chris@39: } Chris@39: Chris@39: err = Pa_StopStream( stream ); Chris@39: if( err != paNoError ) goto error; Chris@39: Chris@39: ++left_inc; Chris@39: ++right_inc; Chris@39: Chris@39: Pa_Sleep( 1000 ); Chris@39: } Chris@39: Chris@39: err = Pa_CloseStream( stream ); Chris@39: if( err != paNoError ) goto error; Chris@39: Chris@39: Pa_Terminate(); Chris@39: printf("Test finished.\n"); Chris@39: Chris@39: return err; Chris@39: Chris@39: error: Chris@39: fprintf( stderr, "An error occured while using the portaudio stream\n" ); Chris@39: fprintf( stderr, "Error number: %d\n", err ); Chris@39: fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); Chris@39: // Print more information about the error. Chris@39: if( err == paUnanticipatedHostError ) Chris@39: { Chris@39: const PaHostErrorInfo *hostErrorInfo = Pa_GetLastHostErrorInfo(); Chris@39: fprintf( stderr, "Host API error = #%ld, hostApiType = %d\n", hostErrorInfo->errorCode, hostErrorInfo->hostApiType ); Chris@39: fprintf( stderr, "Host API error = %s\n", hostErrorInfo->errorText ); Chris@39: } Chris@39: Pa_Terminate(); Chris@39: return err; Chris@39: }