c022bb8d51
Remove ENABLE_IAX option Add an improved FGCom standalone as part of FG in utils directory
178 lines
6.2 KiB
C
178 lines
6.2 KiB
C
/** @file patest_clip.c
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@brief Play a sine wave for several seconds at an amplitude
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that would require clipping.
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@author Phil Burk http://www.softsynth.com
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*/
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/*
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* $Id: patest_clip.c,v 1.1 2006/06/10 21:30:56 dmazzoni 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 (4)
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#define SAMPLE_RATE (44100)
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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 paTestData
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{
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float sine[TABLE_SIZE];
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float amplitude;
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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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PaError PlaySine( paTestData *data, unsigned long flags, float amplitude );
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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 sineCallback( 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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float amplitude = data->amplitude;
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unsigned int i;
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(void) inputBuffer; /* Prevent "unused variable" warnings. */
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(void) timeInfo;
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(void) statusFlags;
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for( i=0; i<framesPerBuffer; i++ )
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{
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*out++ = amplitude * data->sine[data->left_phase]; /* left */
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*out++ = amplitude * 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 0;
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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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PaError err;
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paTestData data;
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int i;
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printf("PortAudio Test: output sine wave with and without clipping.\n");
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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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printf("\nHalf amplitude. Should sound like sine wave.\n"); fflush(stdout);
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err = PlaySine( &data, paClipOff | paDitherOff, 0.5f );
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if( err < 0 ) goto error;
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printf("\nFull amplitude. Should sound like sine wave.\n"); fflush(stdout);
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err = PlaySine( &data, paClipOff | paDitherOff, 0.999f );
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if( err < 0 ) goto error;
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printf("\nOver range with clipping and dithering turned OFF. Should sound very nasty.\n");
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fflush(stdout);
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err = PlaySine( &data, paClipOff | paDitherOff, 1.1f );
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if( err < 0 ) goto error;
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printf("\nOver range with clipping and dithering turned ON. Should sound smoother than previous.\n");
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fflush(stdout);
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err = PlaySine( &data, paNoFlag, 1.1f );
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if( err < 0 ) goto error;
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printf("\nOver range with paClipOff but dithering ON.\n"
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"That forces clipping ON so it should sound the same as previous.\n");
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fflush(stdout);
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err = PlaySine( &data, paClipOff, 1.1f );
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if( err < 0 ) goto error;
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return 0;
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error:
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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 1;
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}
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/*****************************************************************************/
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PaError PlaySine( paTestData *data, unsigned long flags, float amplitude )
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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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data->left_phase = data->right_phase = 0;
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data->amplitude = amplitude;
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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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1024,
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flags,
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sineCallback,
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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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Pa_Sleep( NUM_SECONDS * 1000 );
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printf("CPULoad = %8.6f\n", Pa_GetStreamCpuLoad( stream ) );
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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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return paNoError;
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error:
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return err;
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}
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