diff options
Diffstat (limited to 'pd/portaudio_v18/pa_tests/pa_fuzz.c')
| -rw-r--r-- | pd/portaudio_v18/pa_tests/pa_fuzz.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/pd/portaudio_v18/pa_tests/pa_fuzz.c b/pd/portaudio_v18/pa_tests/pa_fuzz.c new file mode 100644 index 00000000..3f0cdb56 --- /dev/null +++ b/pd/portaudio_v18/pa_tests/pa_fuzz.c @@ -0,0 +1,156 @@ +/* + * $Id: pa_fuzz.c,v 1.1.1.1.4.1 2003/02/11 21:41:32 philburk Exp $ + * pa_fuzz.c + * Distort input like a fuzz boz. + * + * Author: Phil Burk http://www.softsynth.com + * + * This program uses the PortAudio Portable Audio Library. + * For more information see: http://www.portaudio.com + * Copyright (c) 1999-2000 Ross Bencina and Phil Burk + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files + * (the "Software"), to deal in the Software without restriction, + * including without limitation the rights to use, copy, modify, merge, + * publish, distribute, sublicense, and/or sell copies of the Software, + * and to permit persons to whom the Software is furnished to do so, + * subject to the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * Any person wishing to distribute modifications to the Software is + * requested to send the modifications to the original developer so that + * they can be incorporated into the canonical version. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. + * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR + * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF + * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION + * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + * + */ +#include <stdio.h> +#include <math.h> +#include "portaudio.h" +/* +** Note that many of the older ISA sound cards on PCs do NOT support +** full duplex audio (simultaneous record and playback). +** And some only support full duplex at lower sample rates. +*/ +#define SAMPLE_RATE (44100) +#define PA_SAMPLE_TYPE paFloat32 +#define FRAMES_PER_BUFFER (64) + +typedef float SAMPLE; + +float CubicAmplifier( float input ); +static int fuzzCallback( void *inputBuffer, void *outputBuffer, + unsigned long framesPerBuffer, + PaTimestamp outTime, void *userData ); + +/* Non-linear amplifier with soft distortion curve. */ +float CubicAmplifier( float input ) +{ + float output, temp; + if( input < 0.0 ) + { + temp = input + 1.0f; + output = (temp * temp * temp) - 1.0f; + } + else + { + temp = input - 1.0f; + output = (temp * temp * temp) + 1.0f; + } + + return output; +} +#define FUZZ(x) CubicAmplifier(CubicAmplifier(CubicAmplifier(CubicAmplifier(x)))) + +static int gNumNoInputs = 0; +/* This routine will be called by the PortAudio engine when audio is needed. +** It may be called at interrupt level on some machines so don't do anything +** that could mess up the system like calling malloc() or free(). +*/ +static int fuzzCallback( void *inputBuffer, void *outputBuffer, + unsigned long framesPerBuffer, + PaTimestamp outTime, void *userData ) +{ + SAMPLE *out = (SAMPLE*)outputBuffer; + SAMPLE *in = (SAMPLE*)inputBuffer; + unsigned int i; + (void) outTime; /* Prevent unused variable warnings. */ + (void) userData; + + if( inputBuffer == NULL ) + { + for( i=0; i<framesPerBuffer; i++ ) + { + *out++ = 0; /* left - silent */ + *out++ = 0; /* right - silent */ + } + gNumNoInputs += 1; + } + else + { + for( i=0; i<framesPerBuffer; i++ ) + { + *out++ = FUZZ(*in++); /* left - distorted */ + *out++ = *in++; /* right - clean */ + } + } + return 0; +} + +/*******************************************************************/ +int main(void); +int main(void) +{ + PortAudioStream *stream; + PaError err; + + err = Pa_Initialize(); + if( err != paNoError ) goto error; + + err = Pa_OpenStream( + &stream, + Pa_GetDefaultInputDeviceID(), /* default output device */ + 2, /* stereo input */ + PA_SAMPLE_TYPE, + NULL, + Pa_GetDefaultOutputDeviceID(), /* default output device */ + 2, /* stereo output */ + PA_SAMPLE_TYPE, + NULL, + SAMPLE_RATE, + FRAMES_PER_BUFFER, + 0, /* number of buffers, if zero then use default minimum */ + 0, // paClipOff, /* we won't output out of range samples so don't bother clipping them */ + fuzzCallback, + NULL ); + if( err != paNoError ) goto error; + + err = Pa_StartStream( stream ); + if( err != paNoError ) goto error; + + printf("Hit ENTER to stop program.\n"); + fflush(stdout); + getchar(); + err = Pa_CloseStream( stream ); + if( err != paNoError ) goto error; + + printf("Finished. gNumNoInputs = %d\n", gNumNoInputs ); + Pa_Terminate(); + return 0; + +error: + Pa_Terminate(); + fprintf( stderr, "An error occured while using the portaudio stream\n" ); + fprintf( stderr, "Error number: %d\n", err ); + fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); + return -1; +} |