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authorsanine <sanine.not@pm.me>2022-08-25 14:54:53 -0500
committersanine <sanine.not@pm.me>2022-08-25 14:54:53 -0500
commit37c97e345d12f95dde44e1d1a4c2f2aadd4615bc (patch)
treee1bb25bc855883062bdd7847ff2c04290f71c840 /portaudio/examples/pa_fuzz.c
parent5634c7b04da619669f2f29f6798c03982be05180 (diff)
add initial structure
Diffstat (limited to 'portaudio/examples/pa_fuzz.c')
-rw-r--r--portaudio/examples/pa_fuzz.c183
1 files changed, 183 insertions, 0 deletions
diff --git a/portaudio/examples/pa_fuzz.c b/portaudio/examples/pa_fuzz.c
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+++ b/portaudio/examples/pa_fuzz.c
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+/** @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;
+}