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try lower latency, better print messages

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phil 2002-02-07 17:54:56 +00:00
commit ae00b6ebde
1 changed files with 8 additions and 4 deletions
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12
pa_tests/patest_latency.c
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@ -3,7 +3,7 @@
* Hear the latency caused by bug buffers.
* Play a sine wave and change frequency based on letter input.
*
* Author: Phil Burk <philburk@softsynth.com>
* Author: Phil Burk <philburk@softsynth.com>, and Darren Gibbs
*
* This program uses the PortAudio Portable Audio Library.
* For more information see: http://www.portaudio.com
@ -36,15 +36,18 @@
#include <stdio.h>
#include <math.h>
#include "portaudio.h"
#define OUTPUT_DEVICE (Pa_GetDefaultOutputDeviceID())
#define SAMPLE_RATE (44100)
#define FRAMES_PER_BUFFER (256)
#if 1
#define FRAMES_PER_BUFFER (64)
#if 0
#define MIN_LATENCY_MSEC (2000)
#define NUM_BUFFERS ((MIN_LATENCY_MSEC * SAMPLE_RATE) / (FRAMES_PER_BUFFER * 1000))
#else
#define NUM_BUFFERS (0)
#endif
#define MIN_FREQ (100.0f)
#define CalcPhaseIncrement(freq) ((freq)/SAMPLE_RATE)
#ifndef M_PI
@ -108,7 +111,7 @@ int main(void)
paTestData data;
int i;
int done = 0;
printf("PortAudio Test: output sine sweep. ask for %d buffers\n", NUM_BUFFERS );
printf("PortAudio Test: enter letter then hit ENTER. numBuffers = %d\n", NUM_BUFFERS );
/* initialise sinusoidal wavetable */
for( i=0; i<TABLE_SIZE; i++ )
{
@ -117,6 +120,7 @@ int main(void)
data.sine[TABLE_SIZE] = data.sine[0]; // set guard point
data.left_phase = data.right_phase = 0.0;
data.phase_increment = CalcPhaseIncrement(MIN_FREQ);
err = Pa_Initialize();
if( err != paNoError ) goto error;
printf("PortAudio Test: output device = %d\n", OUTPUT_DEVICE );