cannam@162: /** @file patest_clip.c
cannam@162: 	@ingroup test_src
cannam@162: 	@brief Play a sine wave for several seconds at an amplitude 
cannam@162: 	that would require clipping.
cannam@162: 
cannam@162: 	@author Phil Burk  http://www.softsynth.com
cannam@162: */
cannam@162: /*
cannam@162:  * $Id$
cannam@162:  *
cannam@162:  * This program uses the PortAudio Portable Audio Library.
cannam@162:  * For more information see: http://www.portaudio.com
cannam@162:  * Copyright (c) 1999-2000 Ross Bencina and Phil Burk
cannam@162:  *
cannam@162:  * Permission is hereby granted, free of charge, to any person obtaining
cannam@162:  * a copy of this software and associated documentation files
cannam@162:  * (the "Software"), to deal in the Software without restriction,
cannam@162:  * including without limitation the rights to use, copy, modify, merge,
cannam@162:  * publish, distribute, sublicense, and/or sell copies of the Software,
cannam@162:  * and to permit persons to whom the Software is furnished to do so,
cannam@162:  * subject to the following conditions:
cannam@162:  *
cannam@162:  * The above copyright notice and this permission notice shall be
cannam@162:  * included in all copies or substantial portions of the Software.
cannam@162:  *
cannam@162:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
cannam@162:  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
cannam@162:  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
cannam@162:  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
cannam@162:  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
cannam@162:  * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
cannam@162:  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
cannam@162:  */
cannam@162: 
cannam@162: /*
cannam@162:  * The text above constitutes the entire PortAudio license; however, 
cannam@162:  * the PortAudio community also makes the following non-binding requests:
cannam@162:  *
cannam@162:  * Any person wishing to distribute modifications to the Software is
cannam@162:  * requested to send the modifications to the original developer so that
cannam@162:  * they can be incorporated into the canonical version. It is also 
cannam@162:  * requested that these non-binding requests be included along with the 
cannam@162:  * license above.
cannam@162:  */
cannam@162: 
cannam@162: #include <stdio.h>
cannam@162: #include <math.h>
cannam@162: #include "portaudio.h"
cannam@162: 
cannam@162: #define NUM_SECONDS   (4)
cannam@162: #define SAMPLE_RATE   (44100)
cannam@162: #ifndef M_PI
cannam@162: #define M_PI  (3.14159265)
cannam@162: #endif
cannam@162: #define TABLE_SIZE   (200)
cannam@162: 
cannam@162: typedef struct paTestData
cannam@162: {
cannam@162:     float sine[TABLE_SIZE];
cannam@162:     float amplitude;
cannam@162:     int left_phase;
cannam@162:     int right_phase;
cannam@162: }
cannam@162: paTestData;
cannam@162: 
cannam@162: PaError PlaySine( paTestData *data, unsigned long flags, float amplitude );
cannam@162: 
cannam@162: /* This routine will be called by the PortAudio engine when audio is needed.
cannam@162: ** It may called at interrupt level on some machines so don't do anything
cannam@162: ** that could mess up the system like calling malloc() or free().
cannam@162: */
cannam@162: static int sineCallback( const void *inputBuffer, void *outputBuffer,
cannam@162:                             unsigned long framesPerBuffer,
cannam@162:                             const PaStreamCallbackTimeInfo* timeInfo,
cannam@162:                             PaStreamCallbackFlags statusFlags,
cannam@162:                             void *userData )
cannam@162: {
cannam@162:     paTestData *data = (paTestData*)userData;
cannam@162:     float *out = (float*)outputBuffer;
cannam@162:     float amplitude = data->amplitude;
cannam@162:     unsigned int i;
cannam@162:     (void) inputBuffer; /* Prevent "unused variable" warnings. */
cannam@162:     (void) timeInfo;
cannam@162:     (void) statusFlags;
cannam@162: 
cannam@162:     for( i=0; i<framesPerBuffer; i++ )
cannam@162:     {
cannam@162:         *out++ = amplitude * data->sine[data->left_phase];  /* left */
cannam@162:         *out++ = amplitude * data->sine[data->right_phase];  /* right */
cannam@162:         data->left_phase += 1;
cannam@162:         if( data->left_phase >= TABLE_SIZE ) data->left_phase -= TABLE_SIZE;
cannam@162:         data->right_phase += 3; /* higher pitch so we can distinguish left and right. */
cannam@162:         if( data->right_phase >= TABLE_SIZE ) data->right_phase -= TABLE_SIZE;
cannam@162:     }
cannam@162:     return 0;
cannam@162: }
cannam@162: /*******************************************************************/
cannam@162: int main(void);
cannam@162: int main(void)
cannam@162: {
cannam@162:     PaError err;
cannam@162:     paTestData data;
cannam@162:     int i;
cannam@162: 
cannam@162:     printf("PortAudio Test: output sine wave with and without clipping.\n");
cannam@162:     /* initialise sinusoidal wavetable */
cannam@162:     for( i=0; i<TABLE_SIZE; i++ )
cannam@162:     {
cannam@162:         data.sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. );
cannam@162:     }
cannam@162: 
cannam@162:     printf("\nHalf amplitude. Should sound like sine wave.\n"); fflush(stdout);
cannam@162:     err = PlaySine( &data, paClipOff | paDitherOff, 0.5f );
cannam@162:     if( err < 0 ) goto error;
cannam@162: 
cannam@162:     printf("\nFull amplitude. Should sound like sine wave.\n"); fflush(stdout);
cannam@162:     err = PlaySine( &data, paClipOff | paDitherOff, 0.999f );
cannam@162:     if( err < 0 ) goto error;
cannam@162: 
cannam@162:     printf("\nOver range with clipping and dithering turned OFF. Should sound very nasty.\n");
cannam@162:     fflush(stdout);
cannam@162:     err = PlaySine( &data, paClipOff | paDitherOff, 1.1f );
cannam@162:     if( err < 0 ) goto error;
cannam@162: 
cannam@162:     printf("\nOver range with clipping and dithering turned ON.  Should sound smoother than previous.\n");
cannam@162:     fflush(stdout);
cannam@162:     err = PlaySine( &data, paNoFlag, 1.1f );
cannam@162:     if( err < 0 ) goto error;
cannam@162: 
cannam@162:     printf("\nOver range with paClipOff but dithering ON.\n"
cannam@162:            "That forces clipping ON so it should sound the same as previous.\n");
cannam@162:     fflush(stdout);
cannam@162:     err = PlaySine( &data, paClipOff, 1.1f );
cannam@162:     if( err < 0 ) goto error;
cannam@162:     
cannam@162:     return 0;
cannam@162: error:
cannam@162:     fprintf( stderr, "An error occured while using the portaudio stream\n" );
cannam@162:     fprintf( stderr, "Error number: %d\n", err );
cannam@162:     fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
cannam@162:     return 1;
cannam@162: }
cannam@162: /*****************************************************************************/
cannam@162: PaError PlaySine( paTestData *data, unsigned long flags, float amplitude )
cannam@162: {
cannam@162:     PaStreamParameters outputParameters;
cannam@162:     PaStream *stream;
cannam@162:     PaError err;
cannam@162: 
cannam@162:     data->left_phase = data->right_phase = 0;
cannam@162:     data->amplitude = amplitude;
cannam@162:     
cannam@162:     err = Pa_Initialize();
cannam@162:     if( err != paNoError ) goto error;
cannam@162: 
cannam@162:     outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */
cannam@162:     if (outputParameters.device == paNoDevice) {
cannam@162:       fprintf(stderr,"Error: No default output device.\n");
cannam@162:       goto error;
cannam@162:     }
cannam@162:     outputParameters.channelCount = 2;       /* stereo output */
cannam@162:     outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */
cannam@162:     outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;
cannam@162:     outputParameters.hostApiSpecificStreamInfo = NULL;
cannam@162:     
cannam@162:     err = Pa_OpenStream(
cannam@162:               &stream,
cannam@162:               NULL, /* no input */
cannam@162:               &outputParameters,
cannam@162:               SAMPLE_RATE,
cannam@162:               1024,
cannam@162:               flags,
cannam@162:               sineCallback,
cannam@162:               data );
cannam@162:     if( err != paNoError ) goto error;
cannam@162: 
cannam@162:     err = Pa_StartStream( stream );
cannam@162:     if( err != paNoError ) goto error;
cannam@162: 
cannam@162:     Pa_Sleep( NUM_SECONDS * 1000 );
cannam@162:     printf("CPULoad = %8.6f\n", Pa_GetStreamCpuLoad( stream ) );
cannam@162: 
cannam@162:     err = Pa_CloseStream( stream );
cannam@162:     if( err != paNoError ) goto error;
cannam@162:     
cannam@162:     Pa_Terminate();
cannam@162:     return paNoError;
cannam@162: error:
cannam@162:     return err;
cannam@162: }