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Code

sine sweep generator

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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@13722 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
michael 2004-10-21 12:10:55 +00:00
parent 798d2d1337
commit c68662a8c7
3 changed files with 98 additions and 1 deletions
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2
libaf/Makefile
View File

@ -2,7 +2,7 @@ include ../config.mak
LIBNAME = libaf.a
SRCS=af.c af_mp.c af_dummy.c af_delay.c af_channels.c af_format.c af_resample.c window.c filter.c af_volume.c af_equalizer.c af_tools.c af_comp.c af_gate.c af_pan.c af_surround.c af_sub.c af_export.c af_volnorm.c af_extrastereo.c af_lavcresample.c
SRCS=af.c af_mp.c af_dummy.c af_delay.c af_channels.c af_format.c af_resample.c window.c filter.c af_volume.c af_equalizer.c af_tools.c af_comp.c af_gate.c af_pan.c af_surround.c af_sub.c af_export.c af_volnorm.c af_extrastereo.c af_lavcresample.c af_sweep.c
OBJS=$(SRCS:.c=.o)

2
libaf/af.c
View File

@ -26,6 +26,7 @@ extern af_info_t af_info_export;
extern af_info_t af_info_volnorm;
extern af_info_t af_info_extrastereo;
extern af_info_t af_info_lavcresample;
extern af_info_t af_info_sweep;
static af_info_t* filter_list[]={
&af_info_dummy,
@ -48,6 +49,7 @@ static af_info_t* filter_list[]={
#ifdef USE_LIBAVCODEC
&af_info_lavcresample,
#endif
&af_info_sweep,
NULL
};

95
libaf/af_sweep.c Normal file
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@ -0,0 +1,95 @@
// Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
// #inlcude <GPL_v2.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <math.h>
#include "../config.h"
#include "af.h"
typedef struct af_sweep_s{
double x;
double delta;
}af_sweept;
// Initialization and runtime control
static int control(struct af_instance_s* af, int cmd, void* arg)
{
af_sweept* s = (af_sweept*)af->setup;
af_data_t *data= (af_data_t*)arg;
switch(cmd){
case AF_CONTROL_REINIT:
if(data->format != (AF_FORMAT_SI | AF_FORMAT_NE))
return AF_ERROR;
af->data->nch = data->nch;
af->data->format = AF_FORMAT_SI | AF_FORMAT_NE;
af->data->bps = 2;
af->data->rate = data->rate;
return AF_OK;
case AF_CONTROL_COMMAND_LINE:
sscanf((char*)arg,"%lf", &s->delta);
return AF_OK;
/* case AF_CONTROL_RESAMPLE_RATE | AF_CONTROL_SET:
af->data->rate = *(int*)arg;
return AF_OK;*/
}
return AF_UNKNOWN;
}
// Deallocate memory
static void uninit(struct af_instance_s* af)
{
if(af->data)
free(af->data);
if(af->setup){
af_sweept *s = af->setup;
free(s);
}
}
// Filter data through filter
static af_data_t* play(struct af_instance_s* af, af_data_t* data)
{
af_sweept *s = af->setup;
int i, j;
int16_t *in = (int16_t*)data->audio;
int chans = data->nch;
int in_len = data->len/(2*chans);
for(i=0; i<in_len; i++){
for(j=0; j<chans; j++)
in[i*chans+j]= 32000*sin(s->x*s->x);
s->x += s->delta;
if(2*s->x*s->delta >= 3.141592) s->x=0;
}
return data;
}
static int open(af_instance_t* af){
af->control=control;
af->uninit=uninit;
af->play=play;
af->mul.n=1;
af->mul.d=1;
af->data=calloc(1,sizeof(af_data_t));
af->setup=calloc(1,sizeof(af_sweept));
return AF_OK;
}
af_info_t af_info_sweep = {
"sine sweep",
"sweep",
"Michael Niedermayer",
"",
AF_FLAGS_REENTRANT,
open
};