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/** @file patest_sine.c |
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@brief Play a sine wave for several seconds. |
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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: patest_sine.c,v 1.1.2.1 2006/06/06 19:37:56 letz Exp $ |
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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 (64) |
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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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typedef struct |
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{ |
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float sine[TABLE_SIZE]; |
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int left_phase; |
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int right_phase; |
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} |
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paTestData; |
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/* This routine will be called by the PortAudio engine when audio is needed. |
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** It may called at interrupt level on some machines so don't do anything |
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** that could mess up the system like calling malloc() or free(). |
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*/ |
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static int patestCallback( const void *inputBuffer, void *outputBuffer, |
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unsigned long framesPerBuffer, |
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const PaStreamCallbackTimeInfo* timeInfo, |
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PaStreamCallbackFlags statusFlags, |
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void *userData ) |
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{ |
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paTestData *data = (paTestData*)userData; |
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float *out = (float*)outputBuffer; |
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unsigned long i; |
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(void) timeInfo; /* Prevent unused variable warnings. */ |
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(void) statusFlags; |
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(void) inputBuffer; |
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for( i=0; i<framesPerBuffer; i++ ) |
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{ |
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*out++ = data->sine[data->left_phase]; /* left */ |
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*out++ = data->sine[data->right_phase]; /* right */ |
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data->left_phase += 1; |
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if( data->left_phase >= TABLE_SIZE ) data->left_phase -= TABLE_SIZE; |
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data->right_phase += 3; /* higher pitch so we can distinguish left and right. */ |
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if( data->right_phase >= TABLE_SIZE ) data->right_phase -= TABLE_SIZE; |
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} |
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return paContinue; |
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} |
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/*******************************************************************/ |
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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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paTestData data; |
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int i; |
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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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data.sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. ); |
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} |
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data.left_phase = data.right_phase = 0; |
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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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patestCallback, |
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&data ); |
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if( err != paNoError ) goto error; |
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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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Pa_Sleep( NUM_SECONDS * 1000 ); |
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err = Pa_StopStream( stream ); |
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if( err != paNoError ) goto error; |
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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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} |