mirror of https://github.com/mpv-player/mpv
102 lines
2.5 KiB
C
102 lines
2.5 KiB
C
/*
|
|
* Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
|
|
*
|
|
* This file is part of MPlayer.
|
|
*
|
|
* MPlayer is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* MPlayer is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with MPlayer; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#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* af, int cmd, void* arg)
|
|
{
|
|
af_sweept* s = (af_sweept*)af->setup;
|
|
struct mp_audio *data= (struct mp_audio*)arg;
|
|
|
|
switch(cmd){
|
|
case AF_CONTROL_REINIT:
|
|
mp_audio_copy_config(af->data, data);
|
|
mp_audio_set_format(af->data, AF_FORMAT_S16_NE);
|
|
|
|
return af_test_output(af, data);
|
|
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* af)
|
|
{
|
|
free(af->data);
|
|
free(af->setup);
|
|
}
|
|
|
|
// Filter data through filter
|
|
static struct mp_audio* play(struct af_instance* af, struct mp_audio* 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 af_open(struct af_instance* af){
|
|
af->control=control;
|
|
af->uninit=uninit;
|
|
af->play=play;
|
|
af->mul=1;
|
|
af->data=calloc(1,sizeof(struct mp_audio));
|
|
af->setup=calloc(1,sizeof(af_sweept));
|
|
return AF_OK;
|
|
}
|
|
|
|
struct af_info af_info_sweep = {
|
|
"sine sweep",
|
|
"sweep",
|
|
"Michael Niedermayer",
|
|
"",
|
|
AF_FLAGS_REENTRANT,
|
|
af_open
|
|
};
|