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simpleaudio tone generator

This commit is contained in:
Kamal Mostafa 2011-06-18 11:29:00 -07:00
parent 31eb95afe8
commit b7338563a7
4 changed files with 73 additions and 2 deletions
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1
src/Makefile.am
View File

@ -21,6 +21,7 @@ SIMPLEAUDIO_SRC = \
simpleaudio.h \
simpleaudio_internal.h \
simpleaudio.c \
simple-tone-generator.c \
simpleaudio-pulse.c \
simpleaudio-sndfile.c

6
src/Makefile.in
View File

@ -56,8 +56,8 @@ am__installdirs = "$(DESTDIR)$(bindir)"
PROGRAMS = $(bin_PROGRAMS)
am__objects_1 = baudot.$(OBJEXT)
am__objects_2 = fsk.$(OBJEXT)
am__objects_3 = simpleaudio.$(OBJEXT) simpleaudio-pulse.$(OBJEXT) \
simpleaudio-sndfile.$(OBJEXT)
am__objects_3 = simpleaudio.$(OBJEXT) simple-tone-generator.$(OBJEXT) \
simpleaudio-pulse.$(OBJEXT) simpleaudio-sndfile.$(OBJEXT)
am_minimodem_OBJECTS = minimodem.$(OBJEXT) $(am__objects_1) \
$(am__objects_2) $(am__objects_3)
minimodem_OBJECTS = $(am_minimodem_OBJECTS)
@ -171,6 +171,7 @@ SIMPLEAUDIO_SRC = \
simpleaudio.h \
simpleaudio_internal.h \
simpleaudio.c \
simple-tone-generator.c \
simpleaudio-pulse.c \
simpleaudio-sndfile.c
@ -262,6 +263,7 @@ distclean-compile:
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/baudot.Po@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/fsk.Po@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/minimodem.Po@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/simple-tone-generator.Po@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/simpleaudio-pulse.Po@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/simpleaudio-sndfile.Po@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/simpleaudio.Po@am__quote@

57
src/simple-tone-generator.c Normal file
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@ -0,0 +1,57 @@
/*
* simple-tone-generator.c
*
* Copyright (C) 2011 Kamal Mostafa <kamal@whence.com>
*
* NO LICENSE HAS BEEN SPECIFIED OR GRANTED FOR THIS WORK.
*
*/
#include <math.h>
#include <strings.h>
#include <assert.h>
#include "simpleaudio.h"
/* "current" phase state of the tone generator */
static float sa_tone_cphase = 0.0;
void
simpleaudio_tone_reset()
{
sa_tone_cphase = 0.0;
}
void
simpleaudio_tone(simpleaudio *sa_out, float tone_freq, size_t nsamples_dur)
{
#define TONE_GEN_BUFSIZE (10*48000) // FIXME
float buf[TONE_GEN_BUFSIZE];
assert ( nsamples_dur <= TONE_GEN_BUFSIZE );
if ( tone_freq != 0 ) {
float wave_nsamples = 48000.0 / tone_freq; // FIXME rate
size_t i;
for ( i=0; i<nsamples_dur; i++ ) {
buf[i] = sinf( M_PI*2.0*( i/wave_nsamples + sa_tone_cphase) );
buf[i] /= 2.0; // normalize (for pulseaudio?) */
}
sa_tone_cphase
= fmodf(sa_tone_cphase + (float)nsamples_dur/wave_nsamples, 1.0);
} else {
bzero(buf, nsamples_dur*sizeof(float));
sa_tone_cphase = 0.0;
}
assert ( simpleaudio_write(sa_out, buf, nsamples_dur) > 0 );
}

11
src/simpleaudio.h
View File

@ -55,4 +55,15 @@ void
simpleaudio_close( simpleaudio *sa );
/*
* simpleaudio tone generator
*/
void
simpleaudio_tone_reset();
void
simpleaudio_tone(simpleaudio *sa_out, float tone_freq, size_t nsamples_dur);
#endif