cannam@124: /** @file paex_sine.c
cannam@124: @ingroup examples_src
cannam@124: @brief Play a sine wave for several seconds.
cannam@124: @author Ross Bencina <rossb@audiomulch.com>
cannam@124: @author Phil Burk <philburk@softsynth.com>
cannam@124: */
cannam@124: /*
cannam@124: * $Id: paex_sine.c 1752 2011-09-08 03:21:55Z philburk $
cannam@124: *
cannam@124: * This program uses the PortAudio Portable Audio Library.
cannam@124: * For more information see: http://www.portaudio.com/
cannam@124: * Copyright (c) 1999-2000 Ross Bencina and Phil Burk
cannam@124: *
cannam@124: * Permission is hereby granted, free of charge, to any person obtaining
cannam@124: * a copy of this software and associated documentation files
cannam@124: * (the "Software"), to deal in the Software without restriction,
cannam@124: * including without limitation the rights to use, copy, modify, merge,
cannam@124: * publish, distribute, sublicense, and/or sell copies of the Software,
cannam@124: * and to permit persons to whom the Software is furnished to do so,
cannam@124: * subject to the following conditions:
cannam@124: *
cannam@124: * The above copyright notice and this permission notice shall be
cannam@124: * included in all copies or substantial portions of the Software.
cannam@124: *
cannam@124: * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
cannam@124: * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
cannam@124: * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
cannam@124: * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
cannam@124: * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
cannam@124: * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
cannam@124: * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
cannam@124: */
cannam@124:
cannam@124: /*
cannam@124: * The text above constitutes the entire PortAudio license; however,
cannam@124: * the PortAudio community also makes the following non-binding requests:
cannam@124: *
cannam@124: * Any person wishing to distribute modifications to the Software is
cannam@124: * requested to send the modifications to the original developer so that
cannam@124: * they can be incorporated into the canonical version. It is also
cannam@124: * requested that these non-binding requests be included along with the
cannam@124: * license above.
cannam@124: */
cannam@124: #include <stdio.h>
cannam@124: #include <math.h>
cannam@124: #include "portaudio.h"
cannam@124:
cannam@124: #define NUM_SECONDS (5)
cannam@124: #define SAMPLE_RATE (44100)
cannam@124: #define FRAMES_PER_BUFFER (64)
cannam@124:
cannam@124: #ifndef M_PI
cannam@124: #define M_PI (3.14159265)
cannam@124: #endif
cannam@124:
cannam@124: #define TABLE_SIZE (200)
cannam@124: typedef struct
cannam@124: {
cannam@124: float sine[TABLE_SIZE];
cannam@124: int left_phase;
cannam@124: int right_phase;
cannam@124: char message[20];
cannam@124: }
cannam@124: paTestData;
cannam@124:
cannam@124: /* This routine will be called by the PortAudio engine when audio is needed.
cannam@124: ** It may called at interrupt level on some machines so don't do anything
cannam@124: ** that could mess up the system like calling malloc() or free().
cannam@124: */
cannam@124: static int patestCallback( const void *inputBuffer, void *outputBuffer,
cannam@124: unsigned long framesPerBuffer,
cannam@124: const PaStreamCallbackTimeInfo* timeInfo,
cannam@124: PaStreamCallbackFlags statusFlags,
cannam@124: void *userData )
cannam@124: {
cannam@124: paTestData *data = (paTestData*)userData;
cannam@124: float *out = (float*)outputBuffer;
cannam@124: unsigned long i;
cannam@124:
cannam@124: (void) timeInfo; /* Prevent unused variable warnings. */
cannam@124: (void) statusFlags;
cannam@124: (void) inputBuffer;
cannam@124:
cannam@124: for( i=0; i<framesPerBuffer; i++ )
cannam@124: {
cannam@124: *out++ = data->sine[data->left_phase]; /* left */
cannam@124: *out++ = data->sine[data->right_phase]; /* right */
cannam@124: data->left_phase += 1;
cannam@124: if( data->left_phase >= TABLE_SIZE ) data->left_phase -= TABLE_SIZE;
cannam@124: data->right_phase += 3; /* higher pitch so we can distinguish left and right. */
cannam@124: if( data->right_phase >= TABLE_SIZE ) data->right_phase -= TABLE_SIZE;
cannam@124: }
cannam@124:
cannam@124: return paContinue;
cannam@124: }
cannam@124:
cannam@124: /*
cannam@124: * This routine is called by portaudio when playback is done.
cannam@124: */
cannam@124: static void StreamFinished( void* userData )
cannam@124: {
cannam@124: paTestData *data = (paTestData *) userData;
cannam@124: printf( "Stream Completed: %s\n", data->message );
cannam@124: }
cannam@124:
cannam@124: /*******************************************************************/
cannam@124: int main(void);
cannam@124: int main(void)
cannam@124: {
cannam@124: PaStreamParameters outputParameters;
cannam@124: PaStream *stream;
cannam@124: PaError err;
cannam@124: paTestData data;
cannam@124: int i;
cannam@124:
cannam@124:
cannam@124: printf("PortAudio Test: output sine wave. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER);
cannam@124:
cannam@124: /* initialise sinusoidal wavetable */
cannam@124: for( i=0; i<TABLE_SIZE; i++ )
cannam@124: {
cannam@124: data.sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. );
cannam@124: }
cannam@124: data.left_phase = data.right_phase = 0;
cannam@124:
cannam@124: err = Pa_Initialize();
cannam@124: if( err != paNoError ) goto error;
cannam@124:
cannam@124: outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */
cannam@124: if (outputParameters.device == paNoDevice) {
cannam@124: fprintf(stderr,"Error: No default output device.\n");
cannam@124: goto error;
cannam@124: }
cannam@124: outputParameters.channelCount = 2; /* stereo output */
cannam@124: outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */
cannam@124: outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;
cannam@124: outputParameters.hostApiSpecificStreamInfo = NULL;
cannam@124:
cannam@124: err = Pa_OpenStream(
cannam@124: &stream,
cannam@124: NULL, /* no input */
cannam@124: &outputParameters,
cannam@124: SAMPLE_RATE,
cannam@124: FRAMES_PER_BUFFER,
cannam@124: paClipOff, /* we won't output out of range samples so don't bother clipping them */
cannam@124: patestCallback,
cannam@124: &data );
cannam@124: if( err != paNoError ) goto error;
cannam@124:
cannam@124: sprintf( data.message, "No Message" );
cannam@124: err = Pa_SetStreamFinishedCallback( stream, &StreamFinished );
cannam@124: if( err != paNoError ) goto error;
cannam@124:
cannam@124: err = Pa_StartStream( stream );
cannam@124: if( err != paNoError ) goto error;
cannam@124:
cannam@124: printf("Play for %d seconds.\n", NUM_SECONDS );
cannam@124: Pa_Sleep( NUM_SECONDS * 1000 );
cannam@124:
cannam@124: err = Pa_StopStream( stream );
cannam@124: if( err != paNoError ) goto error;
cannam@124:
cannam@124: err = Pa_CloseStream( stream );
cannam@124: if( err != paNoError ) goto error;
cannam@124:
cannam@124: Pa_Terminate();
cannam@124: printf("Test finished.\n");
cannam@124:
cannam@124: return err;
cannam@124: error:
cannam@124: Pa_Terminate();
cannam@124: fprintf( stderr, "An error occured while using the portaudio stream\n" );
cannam@124: fprintf( stderr, "Error number: %d\n", err );
cannam@124: fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
cannam@124: return err;
cannam@124: }