Chris@4: /** @file pa_fuzz.c Chris@4: @ingroup examples_src Chris@4: @brief Distort input like a fuzz box. Chris@4: @author Phil Burk http://www.softsynth.com Chris@4: */ Chris@4: /* Chris@4: * $Id: pa_fuzz.c 1752 2011-09-08 03:21:55Z philburk $ Chris@4: * Chris@4: * This program uses the PortAudio Portable Audio Library. Chris@4: * For more information see: http://www.portaudio.com Chris@4: * Copyright (c) 1999-2000 Ross Bencina and Phil Burk Chris@4: * Chris@4: * Permission is hereby granted, free of charge, to any person obtaining Chris@4: * a copy of this software and associated documentation files Chris@4: * (the "Software"), to deal in the Software without restriction, Chris@4: * including without limitation the rights to use, copy, modify, merge, Chris@4: * publish, distribute, sublicense, and/or sell copies of the Software, Chris@4: * and to permit persons to whom the Software is furnished to do so, Chris@4: * subject to the following conditions: Chris@4: * Chris@4: * The above copyright notice and this permission notice shall be Chris@4: * included in all copies or substantial portions of the Software. Chris@4: * Chris@4: * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, Chris@4: * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF Chris@4: * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. Chris@4: * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR Chris@4: * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF Chris@4: * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION Chris@4: * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Chris@4: */ Chris@4: Chris@4: /* Chris@4: * The text above constitutes the entire PortAudio license; however, Chris@4: * the PortAudio community also makes the following non-binding requests: Chris@4: * Chris@4: * Any person wishing to distribute modifications to the Software is Chris@4: * requested to send the modifications to the original developer so that Chris@4: * they can be incorporated into the canonical version. It is also Chris@4: * requested that these non-binding requests be included along with the Chris@4: * license above. Chris@4: */ Chris@4: Chris@4: #include Chris@4: #include Chris@4: #include "portaudio.h" Chris@4: /* Chris@4: ** Note that many of the older ISA sound cards on PCs do NOT support Chris@4: ** full duplex audio (simultaneous record and playback). Chris@4: ** And some only support full duplex at lower sample rates. Chris@4: */ Chris@4: #define SAMPLE_RATE (44100) Chris@4: #define PA_SAMPLE_TYPE paFloat32 Chris@4: #define FRAMES_PER_BUFFER (64) Chris@4: Chris@4: typedef float SAMPLE; Chris@4: Chris@4: float CubicAmplifier( float input ); Chris@4: static int fuzzCallback( const void *inputBuffer, void *outputBuffer, Chris@4: unsigned long framesPerBuffer, Chris@4: const PaStreamCallbackTimeInfo* timeInfo, Chris@4: PaStreamCallbackFlags statusFlags, Chris@4: void *userData ); Chris@4: Chris@4: /* Non-linear amplifier with soft distortion curve. */ Chris@4: float CubicAmplifier( float input ) Chris@4: { Chris@4: float output, temp; Chris@4: if( input < 0.0 ) Chris@4: { Chris@4: temp = input + 1.0f; Chris@4: output = (temp * temp * temp) - 1.0f; Chris@4: } Chris@4: else Chris@4: { Chris@4: temp = input - 1.0f; Chris@4: output = (temp * temp * temp) + 1.0f; Chris@4: } Chris@4: Chris@4: return output; Chris@4: } Chris@4: #define FUZZ(x) CubicAmplifier(CubicAmplifier(CubicAmplifier(CubicAmplifier(x)))) Chris@4: Chris@4: static int gNumNoInputs = 0; Chris@4: /* This routine will be called by the PortAudio engine when audio is needed. Chris@4: ** It may be called at interrupt level on some machines so don't do anything Chris@4: ** that could mess up the system like calling malloc() or free(). Chris@4: */ Chris@4: static int fuzzCallback( const void *inputBuffer, void *outputBuffer, Chris@4: unsigned long framesPerBuffer, Chris@4: const PaStreamCallbackTimeInfo* timeInfo, Chris@4: PaStreamCallbackFlags statusFlags, Chris@4: void *userData ) Chris@4: { Chris@4: SAMPLE *out = (SAMPLE*)outputBuffer; Chris@4: const SAMPLE *in = (const SAMPLE*)inputBuffer; Chris@4: unsigned int i; Chris@4: (void) timeInfo; /* Prevent unused variable warnings. */ Chris@4: (void) statusFlags; Chris@4: (void) userData; Chris@4: Chris@4: if( inputBuffer == NULL ) Chris@4: { Chris@4: for( i=0; idefaultLowInputLatency; Chris@4: inputParameters.hostApiSpecificStreamInfo = NULL; Chris@4: Chris@4: outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */ Chris@4: if (outputParameters.device == paNoDevice) { Chris@4: fprintf(stderr,"Error: No default output device.\n"); Chris@4: goto error; Chris@4: } Chris@4: outputParameters.channelCount = 2; /* stereo output */ Chris@4: outputParameters.sampleFormat = PA_SAMPLE_TYPE; Chris@4: outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency; Chris@4: outputParameters.hostApiSpecificStreamInfo = NULL; Chris@4: Chris@4: err = Pa_OpenStream( Chris@4: &stream, Chris@4: &inputParameters, Chris@4: &outputParameters, Chris@4: SAMPLE_RATE, Chris@4: FRAMES_PER_BUFFER, Chris@4: 0, /* paClipOff, */ /* we won't output out of range samples so don't bother clipping them */ Chris@4: fuzzCallback, Chris@4: NULL ); Chris@4: if( err != paNoError ) goto error; Chris@4: Chris@4: err = Pa_StartStream( stream ); Chris@4: if( err != paNoError ) goto error; Chris@4: Chris@4: printf("Hit ENTER to stop program.\n"); Chris@4: getchar(); Chris@4: err = Pa_CloseStream( stream ); Chris@4: if( err != paNoError ) goto error; Chris@4: Chris@4: printf("Finished. gNumNoInputs = %d\n", gNumNoInputs ); Chris@4: Pa_Terminate(); Chris@4: return 0; Chris@4: Chris@4: error: Chris@4: Pa_Terminate(); Chris@4: fprintf( stderr, "An error occured while using the portaudio stream\n" ); Chris@4: fprintf( stderr, "Error number: %d\n", err ); Chris@4: fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); Chris@4: return -1; Chris@4: }