new beep without jitter
This commit is contained in:
Gerolf Ziegenhain
parent
07d5b97912
commit
ac49de555a
@ -143,6 +143,7 @@ int beep(double freq_hz, double duration_sec)
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{
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buzzer_set_freq(freq_hz);
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msleep(duration_sec*1000.);
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buzzer_set_freq(0.);
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return 0;
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}
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int beep_init()
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178
src/buzzer.c
178
src/buzzer.c
@ -1,178 +0,0 @@
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#include "portaudio.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <unistd.h> // for usleep()
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#define SAMPLE_RATE (44100)
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#define FRAMES_PER_BUFFER (64)
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typedef struct
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{
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uint32_t total_count;
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uint32_t up_count;
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uint32_t counter;
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uint32_t prev_freq;
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uint32_t freq;
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} paTestData;
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//volatile int freq = 0;
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/* This routine will be called by the PortAudio engine when audio is needed.
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** It may called at interrupt level on some machines so don't do anything
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** that could mess up the system like calling malloc() or free().
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*/
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static int patestCallback( const void *inputBuffer, void *outputBuffer,
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unsigned long framesPerBuffer,
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const PaStreamCallbackTimeInfo* timeInfo,
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PaStreamCallbackFlags statusFlags,
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void *userData )
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{
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paTestData *data = (paTestData*)userData;
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uint8_t *out = (uint8_t*)outputBuffer;
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unsigned long i;
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uint32_t freq = data->freq;
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(void) timeInfo; /* Prevent unused variable warnings. */
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(void) statusFlags;
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(void) inputBuffer;
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for( i=0; i<framesPerBuffer; i++ )
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{
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if(data->up_count > 0 && data->total_count == data->up_count) {
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*out++ = 0x00;
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continue;
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}
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data->total_count++;
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if(freq != data->prev_freq) {
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data->counter = 0;
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}
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if(freq) {
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int overflow_max = SAMPLE_RATE / freq;
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uint32_t data_cnt = data->counter % overflow_max;
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if(data_cnt > overflow_max/2)
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*out++ = 0xff;
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else {
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*out++ = 0x00;
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}
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data->counter++;
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}
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else {
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data->counter = 0;
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*out++ = 0;
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}
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data->prev_freq = freq;
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}
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return paContinue;
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}
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static PaStream *stream;
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static paTestData data;
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void buzzer_set_freq(int frequency)
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{
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data.up_count = 0; // do not stop!
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data.freq = frequency;
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}
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void buzzer_beep(int frequency, int msecs)
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{
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data.total_count = 0;
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data.up_count = SAMPLE_RATE * msecs / 1000;
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data.freq = frequency;
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}
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int buzzer_start(void)
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{
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PaStreamParameters outputParameters;
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PaError err;
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int i;
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err = Pa_Initialize();
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if( err != paNoError ) goto error;
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outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */
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outputParameters.channelCount = 1; /* stereo output */
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outputParameters.sampleFormat = paUInt8; /* 32 bit floating point output */
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outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;
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outputParameters.hostApiSpecificStreamInfo = NULL;
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err = Pa_OpenStream(
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&stream,
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NULL, /* no input */
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&outputParameters,
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SAMPLE_RATE,
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FRAMES_PER_BUFFER,
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paClipOff, /* we won't output out of range samples so don't bother clipping them */
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patestCallback,
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&data );
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if( err != paNoError ) goto error;
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err = Pa_StartStream( stream );
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if( err != paNoError ) goto error;
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return err;
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error:
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Pa_Terminate();
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fprintf( stderr, "An error occured while using the portaudio stream\n" );
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fprintf( stderr, "Error number: %d\n", err );
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fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
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return err;
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}
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int buzzer_stop()
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{
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PaError err = 0;
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err = Pa_StopStream( stream );
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if( err != paNoError ) goto error;
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err = Pa_CloseStream( stream );
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if( err != paNoError ) goto error;
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Pa_Terminate();
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return err;
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error:
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Pa_Terminate();
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fprintf( stderr, "An error occured while using the portaudio stream\n" );
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fprintf( stderr, "Error number: %d\n", err );
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fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
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return err;
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}
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void msleep(int d){
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usleep(d*1000);
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}
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int main(void)
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{
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// notes frequency chart: http://www.phy.mtu.edu/~suits/notefreqs.html
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buzzer_start();
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buzzer_set_freq(261);
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msleep(250);
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buzzer_set_freq(0);
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msleep(250);
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buzzer_set_freq(329);
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msleep(250);
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buzzer_set_freq(349);
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msleep(250);
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buzzer_set_freq(392);
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msleep(250);
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buzzer_set_freq(440);
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msleep(250);
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buzzer_set_freq(494);
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msleep(250);
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buzzer_beep(523, 200);
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msleep(250);
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buzzer_stop();
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return 0;
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}
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@ -353,11 +353,11 @@ int main(int argc, char *argv[])
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else
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{
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if(length < 0) {
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//beep(0.0, abs(length)/1000.);
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beep(0.0, abs(length)/1000.);
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}
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else
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{
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//beep(1000.0, length/1000.);
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beep(1000.0, length/1000.);
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}
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}
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}
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