diff options
Diffstat (limited to 'portaudio/pablio/test_w_saw.c')
| -rw-r--r-- | portaudio/pablio/test_w_saw.c | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/portaudio/pablio/test_w_saw.c b/portaudio/pablio/test_w_saw.c new file mode 100644 index 0000000..ef6a042 --- /dev/null +++ b/portaudio/pablio/test_w_saw.c @@ -0,0 +1,114 @@ +/* + * $Id: test_w_saw.c,v 1.3 2010/11/02 18:52:45 rbd Exp $ + * test_w_saw.c + * Generate stereo sawtooth waveforms. + * + * Author: Phil Burk, http://www.softsynth.com + * + * This program uses PABLIO, the Portable Audio Blocking I/O Library. + * PABLIO is built on top of PortAudio, the 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 <stdlib.h> +#include <math.h> +#include "pablio.h" +#include <string.h> + +#define SAMPLE_RATE (44100) +#define NUM_SECONDS (6) +#define SAMPLES_PER_FRAME (2) + +#define FREQUENCY (220.0f) +#define PHASE_INCREMENT (2.0f * FREQUENCY / SAMPLE_RATE) +#define FRAMES_PER_BLOCK (100) + +float samples[FRAMES_PER_BLOCK][SAMPLES_PER_FRAME]; +float phases[SAMPLES_PER_FRAME]; + +/*******************************************************************/ +int main(void); +int main(void) +{ + int i,j; + PaError err; + PABLIO_Stream *aOutStream; + + printf("Generate sawtooth waves using PABLIO.\n"); + fflush(stdout); + + /* Open simplified blocking I/O layer on top of PortAudio. */ + err = OpenAudioStream( &aOutStream, SAMPLE_RATE, paFloat32, + (PABLIO_WRITE | PABLIO_STEREO) ); + if( err != paNoError ) goto error; + + /* Initialize oscillator phases. */ + phases[0] = 0.0; + phases[1] = 0.0; + + for( i=0; i<(NUM_SECONDS * SAMPLE_RATE); i += FRAMES_PER_BLOCK ) + { + /* Generate sawtooth waveforms in a block for efficiency. */ + for( j=0; j<FRAMES_PER_BLOCK; j++ ) + { + /* Generate a sawtooth wave by incrementing a variable. */ + phases[0] += PHASE_INCREMENT; + /* The signal range is -1.0 to +1.0 so wrap around if we go over. */ + if( phases[0] > 1.0f ) phases[0] -= 2.0f; + samples[j][0] = phases[0]; + + /* On the second channel, generate a sawtooth wave a fifth higher. */ + phases[1] += PHASE_INCREMENT * (3.0f / 2.0f); + if( phases[1] > 1.0f ) phases[1] -= 2.0f; + samples[j][1] = phases[1]; + } + + /* Write samples to output. */ + WriteAudioStream( aOutStream, samples, FRAMES_PER_BLOCK ); + } + + CloseAudioStream( aOutStream ); + + printf("Sawtooth sound test complete.\n" ); + fflush(stdout); + return 0; + +error: + fprintf( stderr, "An error occured while using PABLIO\n" ); + fprintf( stderr, "Error number: %d\n", err ); + fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); + return -1; +} |