cannam@124: /** @file pa_fuzz.c cannam@124: @ingroup examples_src cannam@124: @brief Distort input like a fuzz box. cannam@124: @author Phil Burk http://www.softsynth.com cannam@124: */ cannam@124: /* cannam@124: * $Id: pa_fuzz.c 1752 2011-09-08 03:21:55Z philburk $ cannam@124: * cannam@124: * This program uses the PortAudio Portable Audio Library. cannam@124: * For more information see: http://www.portaudio.com cannam@124: * Copyright (c) 1999-2000 Ross Bencina and Phil Burk cannam@124: * cannam@124: * Permission is hereby granted, free of charge, to any person obtaining cannam@124: * a copy of this software and associated documentation files cannam@124: * (the "Software"), to deal in the Software without restriction, cannam@124: * including without limitation the rights to use, copy, modify, merge, cannam@124: * publish, distribute, sublicense, and/or sell copies of the Software, cannam@124: * and to permit persons to whom the Software is furnished to do so, cannam@124: * subject to the following conditions: cannam@124: * cannam@124: * The above copyright notice and this permission notice shall be cannam@124: * included in all copies or substantial portions of the Software. cannam@124: * cannam@124: * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, cannam@124: * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF cannam@124: * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. cannam@124: * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR cannam@124: * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF cannam@124: * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION cannam@124: * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. cannam@124: */ cannam@124: cannam@124: /* cannam@124: * The text above constitutes the entire PortAudio license; however, cannam@124: * the PortAudio community also makes the following non-binding requests: cannam@124: * cannam@124: * Any person wishing to distribute modifications to the Software is cannam@124: * requested to send the modifications to the original developer so that cannam@124: * they can be incorporated into the canonical version. It is also cannam@124: * requested that these non-binding requests be included along with the cannam@124: * license above. cannam@124: */ cannam@124: cannam@124: #include cannam@124: #include cannam@124: #include "portaudio.h" cannam@124: /* cannam@124: ** Note that many of the older ISA sound cards on PCs do NOT support cannam@124: ** full duplex audio (simultaneous record and playback). cannam@124: ** And some only support full duplex at lower sample rates. cannam@124: */ cannam@124: #define SAMPLE_RATE (44100) cannam@124: #define PA_SAMPLE_TYPE paFloat32 cannam@124: #define FRAMES_PER_BUFFER (64) cannam@124: cannam@124: typedef float SAMPLE; cannam@124: cannam@124: float CubicAmplifier( float input ); cannam@124: static int fuzzCallback( const void *inputBuffer, void *outputBuffer, cannam@124: unsigned long framesPerBuffer, cannam@124: const PaStreamCallbackTimeInfo* timeInfo, cannam@124: PaStreamCallbackFlags statusFlags, cannam@124: void *userData ); cannam@124: cannam@124: /* Non-linear amplifier with soft distortion curve. */ cannam@124: float CubicAmplifier( float input ) cannam@124: { cannam@124: float output, temp; cannam@124: if( input < 0.0 ) cannam@124: { cannam@124: temp = input + 1.0f; cannam@124: output = (temp * temp * temp) - 1.0f; cannam@124: } cannam@124: else cannam@124: { cannam@124: temp = input - 1.0f; cannam@124: output = (temp * temp * temp) + 1.0f; cannam@124: } cannam@124: cannam@124: return output; cannam@124: } cannam@124: #define FUZZ(x) CubicAmplifier(CubicAmplifier(CubicAmplifier(CubicAmplifier(x)))) cannam@124: cannam@124: static int gNumNoInputs = 0; cannam@124: /* This routine will be called by the PortAudio engine when audio is needed. cannam@124: ** It may be called at interrupt level on some machines so don't do anything cannam@124: ** that could mess up the system like calling malloc() or free(). cannam@124: */ cannam@124: static int fuzzCallback( const void *inputBuffer, void *outputBuffer, cannam@124: unsigned long framesPerBuffer, cannam@124: const PaStreamCallbackTimeInfo* timeInfo, cannam@124: PaStreamCallbackFlags statusFlags, cannam@124: void *userData ) cannam@124: { cannam@124: SAMPLE *out = (SAMPLE*)outputBuffer; cannam@124: const SAMPLE *in = (const SAMPLE*)inputBuffer; cannam@124: unsigned int i; cannam@124: (void) timeInfo; /* Prevent unused variable warnings. */ cannam@124: (void) statusFlags; cannam@124: (void) userData; cannam@124: cannam@124: if( inputBuffer == NULL ) cannam@124: { cannam@124: for( i=0; idefaultLowInputLatency; cannam@124: inputParameters.hostApiSpecificStreamInfo = NULL; cannam@124: cannam@124: outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */ cannam@124: if (outputParameters.device == paNoDevice) { cannam@124: fprintf(stderr,"Error: No default output device.\n"); cannam@124: goto error; cannam@124: } cannam@124: outputParameters.channelCount = 2; /* stereo output */ cannam@124: outputParameters.sampleFormat = PA_SAMPLE_TYPE; cannam@124: outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency; cannam@124: outputParameters.hostApiSpecificStreamInfo = NULL; cannam@124: cannam@124: err = Pa_OpenStream( cannam@124: &stream, cannam@124: &inputParameters, cannam@124: &outputParameters, cannam@124: SAMPLE_RATE, cannam@124: FRAMES_PER_BUFFER, cannam@124: 0, /* paClipOff, */ /* we won't output out of range samples so don't bother clipping them */ cannam@124: fuzzCallback, cannam@124: NULL ); cannam@124: if( err != paNoError ) goto error; cannam@124: cannam@124: err = Pa_StartStream( stream ); cannam@124: if( err != paNoError ) goto error; cannam@124: cannam@124: printf("Hit ENTER to stop program.\n"); cannam@124: getchar(); cannam@124: err = Pa_CloseStream( stream ); cannam@124: if( err != paNoError ) goto error; cannam@124: cannam@124: printf("Finished. gNumNoInputs = %d\n", gNumNoInputs ); cannam@124: Pa_Terminate(); cannam@124: return 0; cannam@124: cannam@124: error: cannam@124: Pa_Terminate(); cannam@124: fprintf( stderr, "An error occured while using the portaudio stream\n" ); cannam@124: fprintf( stderr, "Error number: %d\n", err ); cannam@124: fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); cannam@124: return -1; cannam@124: }