new beep without jitter

src/beep.c

@@ -143,6 +143,7 @@ int beep(double freq_hz, double duration_sec)
 {
 	buzzer_set_freq(freq_hz);
 	msleep(duration_sec*1000.);
+	buzzer_set_freq(0.);
 	return 0;
 }
 int beep_init()

src/buzzer.c

@@ -1,178 +0,0 @@
-#include "portaudio.h"
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdint.h>
-#include <unistd.h> // for usleep()
-
-#define SAMPLE_RATE   (44100)
-#define FRAMES_PER_BUFFER  (64)
-
-typedef struct
-{
-    uint32_t total_count;
-    uint32_t up_count;
-
-    uint32_t counter;
-    uint32_t prev_freq;
-    uint32_t freq;
-} paTestData;
-
-//volatile int freq = 0;
-
-/* This routine will be called by the PortAudio engine when audio is needed.
-** It may called at interrupt level on some machines so don't do anything
-** that could mess up the system like calling malloc() or free().
-*/
-static int patestCallback( const void *inputBuffer, void *outputBuffer,
-                           unsigned long framesPerBuffer,
-                           const PaStreamCallbackTimeInfo* timeInfo,
-                           PaStreamCallbackFlags statusFlags,
-                           void *userData )
-{
-    paTestData *data = (paTestData*)userData;
-    uint8_t *out = (uint8_t*)outputBuffer;
-    unsigned long i;
-    uint32_t freq = data->freq;
-
-    (void) timeInfo; /* Prevent unused variable warnings. */
-    (void) statusFlags;
-    (void) inputBuffer;
-
-    for( i=0; i<framesPerBuffer; i++ )
-    {
-        if(data->up_count > 0 && data->total_count == data->up_count) {
-            *out++ = 0x00;
-            continue;
-        }
-        data->total_count++;
-
-        if(freq != data->prev_freq) {
-            data->counter = 0;
-        }
-
-        if(freq) {
-            int overflow_max = SAMPLE_RATE / freq;
-            uint32_t data_cnt = data->counter % overflow_max;
-            if(data_cnt > overflow_max/2)
-                *out++ = 0xff;
-            else {
-                *out++ = 0x00;
-            }
-            data->counter++;
-        }
-        else {
-            data->counter = 0;
-            *out++ = 0;
-        }
-        data->prev_freq = freq;
-    }
-
-    return paContinue;
-}
-
-static PaStream *stream;
-static paTestData data;
-
-
-void buzzer_set_freq(int frequency)
-{
-    data.up_count = 0; // do not stop!
-    data.freq = frequency;
-}
-
-void buzzer_beep(int frequency, int msecs)
-{
-    data.total_count = 0;
-    data.up_count = SAMPLE_RATE * msecs / 1000;
-    data.freq = frequency;
-}
-
-int buzzer_start(void)
-{
-    PaStreamParameters outputParameters;
-
-    PaError err;
-    int i;
-
-    err = Pa_Initialize();
-    if( err != paNoError ) goto error;
-
-    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.hostApiSpecificStreamInfo = NULL;
-
-    err = Pa_OpenStream(
-        &stream,
-        NULL, /* no input */
-        &outputParameters,
-        SAMPLE_RATE,
-        FRAMES_PER_BUFFER,
-        paClipOff,      /* we won't output out of range samples so don't bother clipping them */
-        patestCallback,
-        &data );
-    if( err != paNoError ) goto error;
-
-    err = Pa_StartStream( stream );
-    if( err != paNoError ) goto error;
-
-    return err;
-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 ) );
-    return err;
-
-}
-
-int buzzer_stop() 
-{
-    PaError err = 0;
-    err = Pa_StopStream( stream );
-    if( err != paNoError ) goto error;
-
-    err = Pa_CloseStream( stream );
-    if( err != paNoError ) goto error;
-
-    Pa_Terminate();
-
-    return err;
-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 ) );
-    return err;
-}
-void msleep(int d){
-    usleep(d*1000);
-}
-int main(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;
-}

src/irmc.c

@@ -353,11 +353,11 @@ int main(int argc, char *argv[])
 							else
 							{
 								if(length < 0) {
-									//beep(0.0, abs(length)/1000.);
+									beep(0.0, abs(length)/1000.);
 								}
 								else
 								{
-									//beep(1000.0, length/1000.);
+									beep(1000.0, length/1000.);
 								}
 							}
 						}