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