diff options
Diffstat (limited to '3rdparty/portaudio/examples/pa_fuzz.c')
| -rw-r--r-- | 3rdparty/portaudio/examples/pa_fuzz.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/3rdparty/portaudio/examples/pa_fuzz.c b/3rdparty/portaudio/examples/pa_fuzz.c new file mode 100644 index 0000000..0c24d35 --- /dev/null +++ b/3rdparty/portaudio/examples/pa_fuzz.c @@ -0,0 +1,183 @@ +/** @file pa_fuzz.c + @ingroup examples_src + @brief Distort input like a fuzz box. + @author Phil Burk http://www.softsynth.com +*/ +/* + * $Id$ + * + * 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. + * + * 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. + */ + +/* + * The text above constitutes the entire PortAudio license; however, + * the PortAudio community also makes the following non-binding requests: + * + * 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. It is also + * requested that these non-binding requests be included along with the + * license above. + */ + +#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( const void *inputBuffer, void *outputBuffer, + unsigned long framesPerBuffer, + const PaStreamCallbackTimeInfo* timeInfo, + PaStreamCallbackFlags statusFlags, + 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( const void *inputBuffer, void *outputBuffer, + unsigned long framesPerBuffer, + const PaStreamCallbackTimeInfo* timeInfo, + PaStreamCallbackFlags statusFlags, + void *userData ) +{ + SAMPLE *out = (SAMPLE*)outputBuffer; + const SAMPLE *in = (const SAMPLE*)inputBuffer; + unsigned int i; + (void) timeInfo; /* Prevent unused variable warnings. */ + (void) statusFlags; + (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 paContinue; +} + +/*******************************************************************/ +int main(void); +int main(void) +{ + PaStreamParameters inputParameters, outputParameters; + PaStream *stream; + PaError err; + + err = Pa_Initialize(); + if( err != paNoError ) goto error; + + inputParameters.device = Pa_GetDefaultInputDevice(); /* default input device */ + if (inputParameters.device == paNoDevice) { + fprintf(stderr,"Error: No default input device.\n"); + goto error; + } + inputParameters.channelCount = 2; /* stereo input */ + inputParameters.sampleFormat = PA_SAMPLE_TYPE; + inputParameters.suggestedLatency = Pa_GetDeviceInfo( inputParameters.device )->defaultLowInputLatency; + inputParameters.hostApiSpecificStreamInfo = NULL; + + outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */ + if (outputParameters.device == paNoDevice) { + fprintf(stderr,"Error: No default output device.\n"); + goto error; + } + outputParameters.channelCount = 2; /* stereo output */ + outputParameters.sampleFormat = PA_SAMPLE_TYPE; + outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency; + outputParameters.hostApiSpecificStreamInfo = NULL; + + err = Pa_OpenStream( + &stream, + &inputParameters, + &outputParameters, + SAMPLE_RATE, + FRAMES_PER_BUFFER, + 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"); + 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 occurred while using the portaudio stream\n" ); + fprintf( stderr, "Error number: %d\n", err ); + fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); + return -1; +} |