Chris@4: /** @file patest_ringmix.c
Chris@4: 	@ingroup test_src
Chris@4: 	@brief Ring modulate inputs to left output, mix inputs to right output.
Chris@4: */
Chris@4: /*
Chris@4:  * $Id: patest_ringmix.c 1097 2006-08-26 08:27:53Z rossb $ 
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: 
Chris@4: #include "stdio.h"
Chris@4: #include "portaudio.h"
Chris@4: /* This will be called asynchronously by the PortAudio engine. */
Chris@4: static int myCallback( 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:     const float *in  = (const float *) inputBuffer;
Chris@4: 	float *out = (float *) outputBuffer;    
Chris@4:     float leftInput, rightInput;
Chris@4:     unsigned int i;
Chris@4: 
Chris@4:     /* Read input buffer, process data, and fill output buffer. */
Chris@4:     for( i=0; i<framesPerBuffer; i++ )
Chris@4:     {
Chris@4:         leftInput = *in++;      /* Get interleaved samples from input buffer. */
Chris@4:         rightInput = *in++;
Chris@4:         *out++ = leftInput * rightInput;            /* ring modulation */
Chris@4:         *out++ = 0.5f * (leftInput + rightInput);   /* mix */
Chris@4:     }
Chris@4:     return 0;
Chris@4: }
Chris@4: 
Chris@4: /* Open a PortAudioStream to input and output audio data. */
Chris@4: int main(void)
Chris@4: {
Chris@4:     PaStream *stream;
Chris@4:     Pa_Initialize();
Chris@4:     Pa_OpenDefaultStream(
Chris@4:         &stream,
Chris@4:         2, 2,               /* stereo input and output */
Chris@4:         paFloat32,  44100.0,
Chris@4:         64,                 /* 64 frames per buffer */
Chris@4:         myCallback, NULL );
Chris@4:     Pa_StartStream( stream );
Chris@4:     Pa_Sleep( 10000 );    /* Sleep for 10 seconds while processing. */
Chris@4:     Pa_StopStream( stream );
Chris@4:     Pa_CloseStream( stream );
Chris@4:     Pa_Terminate();
Chris@4:     return 0;
Chris@4: }