cannam@162: /** @file pa_fuzz.c cannam@162: @ingroup examples_src cannam@162: @brief Distort input like a fuzz box. cannam@162: @author Phil Burk http://www.softsynth.com cannam@162: */ cannam@162: /* cannam@162: * $Id$ cannam@162: * cannam@162: * This program uses the PortAudio Portable Audio Library. cannam@162: * For more information see: http://www.portaudio.com cannam@162: * Copyright (c) 1999-2000 Ross Bencina and Phil Burk cannam@162: * cannam@162: * Permission is hereby granted, free of charge, to any person obtaining cannam@162: * a copy of this software and associated documentation files cannam@162: * (the "Software"), to deal in the Software without restriction, cannam@162: * including without limitation the rights to use, copy, modify, merge, cannam@162: * publish, distribute, sublicense, and/or sell copies of the Software, cannam@162: * and to permit persons to whom the Software is furnished to do so, cannam@162: * subject to the following conditions: cannam@162: * cannam@162: * The above copyright notice and this permission notice shall be cannam@162: * included in all copies or substantial portions of the Software. cannam@162: * cannam@162: * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, cannam@162: * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF cannam@162: * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. cannam@162: * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR cannam@162: * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF cannam@162: * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION cannam@162: * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. cannam@162: */ cannam@162: cannam@162: /* cannam@162: * The text above constitutes the entire PortAudio license; however, cannam@162: * the PortAudio community also makes the following non-binding requests: cannam@162: * cannam@162: * Any person wishing to distribute modifications to the Software is cannam@162: * requested to send the modifications to the original developer so that cannam@162: * they can be incorporated into the canonical version. It is also cannam@162: * requested that these non-binding requests be included along with the cannam@162: * license above. cannam@162: */ cannam@162: cannam@162: #include cannam@162: #include cannam@162: #include "portaudio.h" cannam@162: /* cannam@162: ** Note that many of the older ISA sound cards on PCs do NOT support cannam@162: ** full duplex audio (simultaneous record and playback). cannam@162: ** And some only support full duplex at lower sample rates. cannam@162: */ cannam@162: #define SAMPLE_RATE (44100) cannam@162: #define PA_SAMPLE_TYPE paFloat32 cannam@162: #define FRAMES_PER_BUFFER (64) cannam@162: cannam@162: typedef float SAMPLE; cannam@162: cannam@162: float CubicAmplifier( float input ); cannam@162: static int fuzzCallback( const void *inputBuffer, void *outputBuffer, cannam@162: unsigned long framesPerBuffer, cannam@162: const PaStreamCallbackTimeInfo* timeInfo, cannam@162: PaStreamCallbackFlags statusFlags, cannam@162: void *userData ); cannam@162: cannam@162: /* Non-linear amplifier with soft distortion curve. */ cannam@162: float CubicAmplifier( float input ) cannam@162: { cannam@162: float output, temp; cannam@162: if( input < 0.0 ) cannam@162: { cannam@162: temp = input + 1.0f; cannam@162: output = (temp * temp * temp) - 1.0f; cannam@162: } cannam@162: else cannam@162: { cannam@162: temp = input - 1.0f; cannam@162: output = (temp * temp * temp) + 1.0f; cannam@162: } cannam@162: cannam@162: return output; cannam@162: } cannam@162: #define FUZZ(x) CubicAmplifier(CubicAmplifier(CubicAmplifier(CubicAmplifier(x)))) cannam@162: cannam@162: static int gNumNoInputs = 0; cannam@162: /* This routine will be called by the PortAudio engine when audio is needed. cannam@162: ** It may be called at interrupt level on some machines so don't do anything cannam@162: ** that could mess up the system like calling malloc() or free(). cannam@162: */ cannam@162: static int fuzzCallback( const void *inputBuffer, void *outputBuffer, cannam@162: unsigned long framesPerBuffer, cannam@162: const PaStreamCallbackTimeInfo* timeInfo, cannam@162: PaStreamCallbackFlags statusFlags, cannam@162: void *userData ) cannam@162: { cannam@162: SAMPLE *out = (SAMPLE*)outputBuffer; cannam@162: const SAMPLE *in = (const SAMPLE*)inputBuffer; cannam@162: unsigned int i; cannam@162: (void) timeInfo; /* Prevent unused variable warnings. */ cannam@162: (void) statusFlags; cannam@162: (void) userData; cannam@162: cannam@162: if( inputBuffer == NULL ) cannam@162: { cannam@162: for( i=0; idefaultLowInputLatency; cannam@162: inputParameters.hostApiSpecificStreamInfo = NULL; cannam@162: cannam@162: outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */ cannam@162: if (outputParameters.device == paNoDevice) { cannam@162: fprintf(stderr,"Error: No default output device.\n"); cannam@162: goto error; cannam@162: } cannam@162: outputParameters.channelCount = 2; /* stereo output */ cannam@162: outputParameters.sampleFormat = PA_SAMPLE_TYPE; cannam@162: outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency; cannam@162: outputParameters.hostApiSpecificStreamInfo = NULL; cannam@162: cannam@162: err = Pa_OpenStream( cannam@162: &stream, cannam@162: &inputParameters, cannam@162: &outputParameters, cannam@162: SAMPLE_RATE, cannam@162: FRAMES_PER_BUFFER, cannam@162: 0, /* paClipOff, */ /* we won't output out of range samples so don't bother clipping them */ cannam@162: fuzzCallback, cannam@162: NULL ); cannam@162: if( err != paNoError ) goto error; cannam@162: cannam@162: err = Pa_StartStream( stream ); cannam@162: if( err != paNoError ) goto error; cannam@162: cannam@162: printf("Hit ENTER to stop program.\n"); cannam@162: getchar(); cannam@162: err = Pa_CloseStream( stream ); cannam@162: if( err != paNoError ) goto error; cannam@162: cannam@162: printf("Finished. gNumNoInputs = %d\n", gNumNoInputs ); cannam@162: Pa_Terminate(); cannam@162: return 0; cannam@162: cannam@162: error: cannam@162: Pa_Terminate(); cannam@162: fprintf( stderr, "An error occured while using the portaudio stream\n" ); cannam@162: fprintf( stderr, "Error number: %d\n", err ); cannam@162: fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); cannam@162: return -1; cannam@162: }