diff options
Diffstat (limited to 'pd/portaudio_v18/pa_tests/pa_minlat.c')
| -rw-r--r-- | pd/portaudio_v18/pa_tests/pa_minlat.c | 172 |
1 files changed, 0 insertions, 172 deletions
diff --git a/pd/portaudio_v18/pa_tests/pa_minlat.c b/pd/portaudio_v18/pa_tests/pa_minlat.c deleted file mode 100644 index 7256cc00..00000000 --- a/pd/portaudio_v18/pa_tests/pa_minlat.c +++ /dev/null @@ -1,172 +0,0 @@ -/* - * $Id: pa_minlat.c,v 1.4 2002/04/30 18:19:00 philburk Exp $ - * paminlat.c - * Experiment with different numbers of buffers to determine the - * minimum latency for a computer. - * - * Author: Phil Burk http://www.softsynth.com - * - * 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. - * - * 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. - * - * 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. - * - */ -#include <stdio.h> -#include <stdlib.h> -#include <math.h> -#include "portaudio.h" - -#ifndef M_PI -#define M_PI (3.14159265) -#endif -#define TWOPI (M_PI * 2.0) - -#define DEFAULT_BUFFER_SIZE (64) - -typedef struct -{ - double left_phase; - double right_phase; -} -paTestData; - -/* Very simple synthesis routine to generate two sine waves. */ -static int paminlatCallback( void *inputBuffer, void *outputBuffer, - unsigned long framesPerBuffer, - PaTimestamp outTime, void *userData ) -{ - paTestData *data = (paTestData*)userData; - float *out = (float*)outputBuffer; - unsigned int i; - double left_phaseInc = 0.02; - double right_phaseInc = 0.06; - - double left_phase = data->left_phase; - double right_phase = data->right_phase; - - for( i=0; i<framesPerBuffer; i++ ) - { - left_phase += left_phaseInc; - if( left_phase > TWOPI ) left_phase -= TWOPI; - *out++ = (float) sin( left_phase ); - - right_phase += right_phaseInc; - if( right_phase > TWOPI ) right_phase -= TWOPI; - *out++ = (float) sin( right_phase ); - } - - data->left_phase = left_phase; - data->right_phase = right_phase; - return 0; -} -void main( int argc, char **argv ); -void main( int argc, char **argv ) -{ - PortAudioStream *stream; - PaError err; - paTestData data; - int go; - int numBuffers = 0; - int minBuffers = 0; - int framesPerBuffer; - double sampleRate = 44100.0; - char str[256]; - printf("paminlat - Determine minimum latency for your computer.\n"); - printf(" usage: paminlat {framesPerBuffer}\n"); - printf(" for example: paminlat 256\n"); - printf("Adjust your stereo until you hear a smooth tone in each speaker.\n"); - printf("Then try to find the smallest number of buffers that still sounds smooth.\n"); - printf("Note that the sound will stop momentarily when you change the number of buffers.\n"); - /* Get bufferSize from command line. */ - framesPerBuffer = ( argc > 1 ) ? atol( argv[1] ) : DEFAULT_BUFFER_SIZE; - printf("Frames per buffer = %d\n", framesPerBuffer ); - - data.left_phase = data.right_phase = 0.0; - err = Pa_Initialize(); - if( err != paNoError ) goto error; - /* Ask PortAudio for the recommended minimum number of buffers. */ - numBuffers = minBuffers = Pa_GetMinNumBuffers( framesPerBuffer, sampleRate ); - printf("NumBuffers set to %d based on a call to Pa_GetMinNumBuffers()\n", numBuffers ); - /* Try different numBuffers in a loop. */ - go = 1; - while( go ) - { - - printf("Latency = framesPerBuffer * numBuffers = %d * %d = %d frames = %d msecs.\n", - framesPerBuffer, numBuffers, framesPerBuffer*numBuffers, - (int)((1000 * framesPerBuffer * numBuffers) / sampleRate) ); - err = Pa_OpenStream( - &stream, - paNoDevice, - 0, /* no input */ - paFloat32, /* 32 bit floating point input */ - NULL, - Pa_GetDefaultOutputDeviceID(), /* default output device */ - 2, /* stereo output */ - paFloat32, /* 32 bit floating point output */ - NULL, - sampleRate, - framesPerBuffer, - numBuffers, /* number of buffers */ - paClipOff, /* we won't output out of range samples so don't bother clipping them */ - paminlatCallback, - &data ); - if( err != paNoError ) goto error; - if( stream == NULL ) goto error; - /* Start audio. */ - err = Pa_StartStream( stream ); - if( err != paNoError ) goto error; - /* Ask user for a new number of buffers. */ - printf("\nMove windows around to see if the sound glitches.\n"); - printf("NumBuffers currently %d, enter new number, or 'q' to quit: ", numBuffers ); - gets( str ); - if( str[0] == 'q' ) go = 0; - else - { - numBuffers = atol( str ); - if( numBuffers < minBuffers ) - { - printf( "numBuffers below minimum of %d! Set to minimum!!!\n", minBuffers ); - numBuffers = minBuffers; - } - } - /* Stop sound until ENTER hit. */ - err = Pa_StopStream( stream ); - if( err != paNoError ) goto error; - err = Pa_CloseStream( stream ); - if( err != paNoError ) goto error; - } - printf("A good setting for latency would be somewhat higher than\n"); - printf("the minimum latency that worked.\n"); - printf("PortAudio: Test finished.\n"); - Pa_Terminate(); - return; -error: - Pa_Terminate(); - fprintf( stderr, "An error occured while using the portaudio stream\n" ); - fprintf( stderr, "Error number: %d\n", err ); - fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); -} |