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add raspi audio fix

This commit is contained in:
Gerolf Ziegenhain 2016-10-04 18:22:16 +02:00
parent 46842ab42b
commit 7ead5be229
1 changed files with 3 additions and 19 deletions
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22
src/beep.c
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@ -3,8 +3,10 @@
#include <stdint.h>
#include <unistd.h> // for usleep()
#include <portaudio.h>
#include "beep.h"
#define RASPI_AUDIO_LATENCY_FIX (/5.8*30.) // https://app.assembla.com/spaces/portaudio/tickets/246-paex_sine-choppy-on-raspberry-pi---defaultlowoutputlatency-too-low/details
// http://stackoverflow.com/questions/7678470/generating-sound-of-a-particular-frequency-using-gcc-in-ubuntu
@ -88,7 +90,7 @@ int buzzer_start(void)
outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */
outputParameters.channelCount = 1; /* stereo output */
outputParameters.sampleFormat = paUInt8; /* 32 bit floating point output */
outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;
outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency * RASPI_AUDIO_LATENCY_FIX;
outputParameters.hostApiSpecificStreamInfo = NULL;
err = Pa_OpenStream(
@ -155,28 +157,10 @@ int beep_init()
int beep_test(void)
{
// notes frequency chart: http://www.phy.mtu.edu/~suits/notefreqs.html
buzzer_start();
buzzer_set_freq(261);
msleep(250);
buzzer_set_freq(0);
msleep(250);
buzzer_set_freq(329);
msleep(250);
buzzer_set_freq(349);
msleep(250);
buzzer_set_freq(392);
msleep(250);
buzzer_set_freq(440);
msleep(250);
buzzer_set_freq(494);
msleep(250);
buzzer_beep(523, 200);
msleep(250);
buzzer_stop();
return 0;
}