cannam@162: /** @file patest_ringmix.c
cannam@162: 	@ingroup test_src
cannam@162: 	@brief Ring modulate inputs to left output, mix inputs to right output.
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: 
cannam@162: #include "stdio.h"
cannam@162: #include "portaudio.h"
cannam@162: /* This will be called asynchronously by the PortAudio engine. */
cannam@162: static int myCallback( 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:     const float *in  = (const float *) inputBuffer;
cannam@162: 	float *out = (float *) outputBuffer;    
cannam@162:     float leftInput, rightInput;
cannam@162:     unsigned int i;
cannam@162: 
cannam@162:     /* Read input buffer, process data, and fill output buffer. */
cannam@162:     for( i=0; i<framesPerBuffer; i++ )
cannam@162:     {
cannam@162:         leftInput = *in++;      /* Get interleaved samples from input buffer. */
cannam@162:         rightInput = *in++;
cannam@162:         *out++ = leftInput * rightInput;            /* ring modulation */
cannam@162:         *out++ = 0.5f * (leftInput + rightInput);   /* mix */
cannam@162:     }
cannam@162:     return 0;
cannam@162: }
cannam@162: 
cannam@162: /* Open a PortAudioStream to input and output audio data. */
cannam@162: int main(void)
cannam@162: {
cannam@162:     PaStream *stream;
cannam@162:     Pa_Initialize();
cannam@162:     Pa_OpenDefaultStream(
cannam@162:         &stream,
cannam@162:         2, 2,               /* stereo input and output */
cannam@162:         paFloat32,  44100.0,
cannam@162:         64,                 /* 64 frames per buffer */
cannam@162:         myCallback, NULL );
cannam@162:     Pa_StartStream( stream );
cannam@162:     Pa_Sleep( 10000 );    /* Sleep for 10 seconds while processing. */
cannam@162:     Pa_StopStream( stream );
cannam@162:     Pa_CloseStream( stream );
cannam@162:     Pa_Terminate();
cannam@162:     return 0;
cannam@162: }