80 lines
3.0 KiB
C
80 lines
3.0 KiB
C
/** @file patest_ringmix.c
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@brief Ring modulate inputs to left output, mix inputs to right output.
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*/
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/*
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* $Id: patest_ringmix.c,v 1.1 2006/06/10 21:30:56 dmazzoni Exp $
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*
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* This program uses the PortAudio Portable Audio Library.
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* For more information see: http://www.portaudio.com
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* Copyright (c) 1999-2000 Ross Bencina and Phil Burk
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* Any person wishing to distribute modifications to the Software is
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* requested to send the modifications to the original developer so that
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* they can be incorporated into the canonical version.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
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* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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*/
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#include "stdio.h"
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#include "portaudio.h"
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/* This will be called asynchronously by the PortAudio engine. */
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static int myCallback( const void *inputBuffer, void *outputBuffer,
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unsigned long framesPerBuffer,
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const PaStreamCallbackTimeInfo* timeInfo,
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PaStreamCallbackFlags statusFlags,
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void *userData )
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{
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const float *in = (const float *) inputBuffer;
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float *out = (float *) outputBuffer;
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float leftInput, rightInput;
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unsigned int i;
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/* Read input buffer, process data, and fill output buffer. */
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for( i=0; i<framesPerBuffer; i++ )
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{
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leftInput = *in++; /* Get interleaved samples from input buffer. */
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rightInput = *in++;
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*out++ = leftInput * rightInput; /* ring modulation */
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*out++ = 0.5f * (leftInput + rightInput); /* mix */
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}
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return 0;
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}
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/* Open a PortAudioStream to input and output audio data. */
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int main(void)
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{
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PaStream *stream;
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Pa_Initialize();
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Pa_OpenDefaultStream(
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&stream,
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2, 2, /* stereo input and output */
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paFloat32, 44100.0,
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64, /* 64 frames per buffer */
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myCallback, NULL );
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Pa_StartStream( stream );
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Pa_Sleep( 10000 ); /* Sleep for 10 seconds while processing. */
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Pa_StopStream( stream );
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Pa_CloseStream( stream );
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Pa_Terminate();
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return 0;
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}
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