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authorGuenter Geiger <ggeiger@users.sourceforge.net>2004-02-02 12:18:59 +0000
committerGuenter Geiger <ggeiger@users.sourceforge.net>2004-02-02 12:18:59 +0000
commit2e416ee0095f1bf608f849f156d564e0f45fb8ab (patch)
tree9e4881e81953b434b91dbd35218d78f05b27e82e /pd/portaudio/pa_tests/pa_minlat.c
parentae6b5d89ea93b95c2990895077cf5e8f0bba9ad9 (diff)
merged in version_0_37_1test6
svn path=/trunk/; revision=1305
Diffstat (limited to 'pd/portaudio/pa_tests/pa_minlat.c')
-rw-r--r--pd/portaudio/pa_tests/pa_minlat.c176
1 files changed, 0 insertions, 176 deletions
diff --git a/pd/portaudio/pa_tests/pa_minlat.c b/pd/portaudio/pa_tests/pa_minlat.c
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--- a/pd/portaudio/pa_tests/pa_minlat.c
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@@ -1,176 +0,0 @@
-/*
- * $Id: pa_minlat.c,v 1.1.1.1 2003-05-09 16:03:56 ggeiger 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 (32)
-
-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 )
-{
- PaStream *stream;
- PaError err;
- paTestData data;
- int go;
- int outLatency = 0;
- int minLatency = DEFAULT_BUFFER_SIZE * 2;
- int framesPerBuffer;
- double sampleRate = 44100.0;
- char str[256];
- printf("pa_minlat - Determine minimum latency for your computer.\n");
- printf(" usage: pa_minlat {userBufferSize}\n");
- printf(" for example: pa_minlat 64\n");
- printf("Adjust your stereo until you hear a smooth tone in each speaker.\n");
- printf("Then try to find the smallest number of frames 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;
-
- outLatency = sampleRate * 200.0 / 1000.0; // 200 msec
-
- /* Try different numBuffers in a loop. */
- go = 1;
- while( go )
- {
-
- printf("Latency = %d frames = %6.1f msec.\n", outLatency,
- (outLatency * 1000.0 / sampleRate) );
- err = Pa_OpenStream(
- &stream,
- paNoDevice,
- 0, /* no input */
- paFloat32, /* 32 bit floating point input */
- 0,
- NULL,
- Pa_GetDefaultOutputDevice(), /* default output device */
- 2, /* stereo output */
- paFloat32, /* 32 bit floating point output */
- outLatency,
- NULL,
- sampleRate,
- framesPerBuffer,
- 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 nlatency. */
- printf("\nMove windows around to see if the sound glitches.\n");
- printf("Latency currently %d, enter new number, or 'q' to quit: ", outLatency );
- gets( str );
- if( str[0] == 'q' ) go = 0;
- else
- {
- outLatency = atol( str );
- if( outLatency < minLatency )
- {
- printf( "Latency below minimum of %d! Set to minimum!!!\n", minLatency );
- outLatency = minLatency;
- }
- }
- /* 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 ) );
-}