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Diffstat (limited to 'portaudio/test/patest1.c')
| -rw-r--r-- | portaudio/test/patest1.c | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/portaudio/test/patest1.c b/portaudio/test/patest1.c new file mode 100644 index 0000000..25d6e3f --- /dev/null +++ b/portaudio/test/patest1.c @@ -0,0 +1,208 @@ +/** @file patest1.c + @ingroup test_src + @brief Ring modulate the audio input with a sine wave for 20 seconds. + @author Ross Bencina <rossb@audiomulch.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" + +#ifndef M_PI +#define M_PI (3.14159265) +#endif + +#define SAMPLE_RATE (44100) + +typedef struct +{ + float sine[100]; + int phase; + int sampsToGo; +} +patest1data; + +static int patest1Callback( const void *inputBuffer, void *outputBuffer, + unsigned long framesPerBuffer, + const PaStreamCallbackTimeInfo* timeInfo, + PaStreamCallbackFlags statusFlags, + void *userData ) +{ + patest1data *data = (patest1data*)userData; + float *in = (float*)inputBuffer; + float *out = (float*)outputBuffer; + int framesToCalc = framesPerBuffer; + unsigned long i = 0; + int finished; + + if( data->sampsToGo < framesPerBuffer ) + { + framesToCalc = data->sampsToGo; + finished = paComplete; + } + else + { + finished = paContinue; + } + + for( ; i<framesToCalc; i++ ) + { + *out++ = *in++ * data->sine[data->phase]; /* left */ + *out++ = *in++ * data->sine[data->phase++]; /* right */ + if( data->phase >= 100 ) + data->phase = 0; + } + + data->sampsToGo -= framesToCalc; + + /* zero remainder of final buffer if not already done */ + for( ; i<framesPerBuffer; i++ ) + { + *out++ = 0; /* left */ + *out++ = 0; /* right */ + } + + return finished; +} + +int main(int argc, char* argv[]); +int main(int argc, char* argv[]) +{ + PaStream *stream; + PaError err; + patest1data data; + int i; + PaStreamParameters inputParameters, outputParameters; + const PaHostErrorInfo* herr; + + printf("patest1.c\n"); fflush(stdout); + printf("Ring modulate input for 20 seconds.\n"); fflush(stdout); + + /* initialise sinusoidal wavetable */ + for( i=0; i<100; i++ ) + data.sine[i] = sin( ((double)i/100.) * M_PI * 2. ); + data.phase = 0; + data.sampsToGo = SAMPLE_RATE * 20; /* 20 seconds. */ + + /* initialise portaudio subsystem */ + err = Pa_Initialize(); + + inputParameters.device = Pa_GetDefaultInputDevice(); /* default input device */ + if (inputParameters.device == paNoDevice) { + fprintf(stderr, "Error: No input default device.\n"); + goto done; + } + inputParameters.channelCount = 2; /* stereo input */ + inputParameters.sampleFormat = paFloat32; /* 32 bit floating point input */ + 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 done; + } + outputParameters.channelCount = 2; /* stereo output */ + outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */ + outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency; + outputParameters.hostApiSpecificStreamInfo = NULL; + + err = Pa_OpenStream( + &stream, + &inputParameters, + &outputParameters, + (double)SAMPLE_RATE, /* Samplerate in Hertz. */ + 512, /* Small buffers */ + paClipOff, /* We won't output out of range samples so don't bother clipping them. */ + patest1Callback, + &data ); + if( err != paNoError ) goto done; + + err = Pa_StartStream( stream ); + if( err != paNoError ) goto done; + + printf( "Press any key to end.\n" ); fflush(stdout); + + getc( stdin ); /* wait for input before exiting */ + + err = Pa_AbortStream( stream ); + if( err != paNoError ) goto done; + + printf( "Waiting for stream to complete...\n" ); + + /* sleep until playback has finished */ + while( ( err = Pa_IsStreamActive( stream ) ) == 1 ) Pa_Sleep(1000); + if( err < 0 ) goto done; + + err = Pa_CloseStream( stream ); + if( err != paNoError ) goto done; + +done: + Pa_Terminate(); + + if( err != paNoError ) + { + fprintf( stderr, "An error occurred while using portaudio\n" ); + if( err == paUnanticipatedHostError ) + { + fprintf( stderr, " unanticipated host error.\n"); + herr = Pa_GetLastHostErrorInfo(); + if (herr) + { + fprintf( stderr, " Error number: %ld\n", herr->errorCode ); + if (herr->errorText) + fprintf( stderr, " Error text: %s\n", herr->errorText ); + } + else + fprintf( stderr, " Pa_GetLastHostErrorInfo() failed!\n" ); + } + else + { + fprintf( stderr, " Error number: %d\n", err ); + fprintf( stderr, " Error text: %s\n", Pa_GetErrorText( err ) ); + } + + err = 1; /* Always return 0 or 1, but no other return codes. */ + } + + printf( "bye\n" ); + + return err; +} |